packages feed

HXQ 0.8 → 0.8.3

raw patch · 23 files changed

+1757/−773 lines, 23 filesdep +HDBCdep +HDBC-sqlite3dep +mtlPVP ok

version bump matches the API change (PVP)

Dependencies added: HDBC, HDBC-sqlite3, mtl

API changes (from Hackage documentation)

+ XML.HXQ.XQuery: XNoPad :: XTree
+ XML.HXQ.XQuery: XStmt :: Statement -> XTree
+ XML.HXQ.XQuery: connect :: FilePath -> IO Connection
+ XML.HXQ.XQuery: createIndex :: (IConnection conn) => conn -> String -> String -> IO ()
+ XML.HXQ.XQuery: disconnect :: (IConnection conn) => conn -> IO ()
+ XML.HXQ.XQuery: executeSQL :: Statement -> XSeq -> IO XSeq
+ XML.HXQ.XQuery: prepareSQL :: (IConnection conn) => conn -> String -> IO Statement
+ XML.HXQ.XQuery: shred :: (IConnection conn) => conn -> String -> String -> IO ()
+ XML.HXQ.XQuery: xfileDB :: (IConnection conn) => String -> conn -> IO XSeq
+ XML.HXQ.XQuery: xqdb :: String -> Q Exp
+ XML.HXQ.XQuery: xqueryDB :: (IConnection conn) => String -> conn -> IO XSeq

Files

+ HXQ-unstable.hs view
@@ -0,0 +1,94 @@+{--------------------------------------------------------------+-+- The main program of the XQuery Compiler+- **** UNSTABLE *****+- Programmer: Leonidas Fegaras (fegaras@cse.uta.edu)+- Date: 05/02/2008+-+---------------------------------------------------------------}++module Main where++import GHC+import DynFlags+import Packages+import PackageConfig+import System.IO+import XML.HXQ.XQuery+import System.Environment+import qualified Control.Exception+import XML.HXQ.Compiler(functions)+import XML.HXQ.Interpreter(evalInput)+++version = "0.8.3"+default_system_path = "/usr/local/lib/ghc-6.8.2"+default_hxq_path = "./"+++parseEnv :: [String] -> [(String,String)]+parseEnv [] = [("hxq",default_hxq_path),("ghc",default_system_path),("o","Temp.hs")]+parseEnv ("-help":xs) = ("help",""):(parseEnv xs)+parseEnv ("-c":file:xs) = ("c",file):(parseEnv xs)+parseEnv ("-o":file:xs) = ("o",file):(parseEnv xs)+parseEnv ("-p":query:file:xs) = ("p","doc('"++file++"')"++query):(parseEnv xs)+parseEnv ("-h":path:xs) = ("hxq",path):(parseEnv xs)+parseEnv ("-l":path:xs) = ("ghc",path):(parseEnv xs)+parseEnv (('-':x):_) = error ("Unrecognized option -"++x++". Use -help.")+parseEnv (file:xs) = ("r",file):(parseEnv xs)+++main = do putStrLn ("HXQ: XQuery Compiler version "++version)+          senv <- getArgs+          let env = parseEnv senv+              Just system_path = lookup "ghc" env+              Just hxq_path = lookup "hxq" env+          case lookup "help" env of+            Just _ -> do putStrLn "Command line options and files:"+                         putStrLn "xquery-file               compile and run the XQuery in xquery-file"+                         putStrLn "-c xquery-file            compile the XQuery in xquery-file into Haskell code"+                         putStrLn "-o haskell-file           set the Haskell file for -c (default is Temp.hs)"+                         putStrLn "-p XPath-query xml-file   compile and run the XPath query against the xml-file"+                         putStrLn ("-h path                   set the HXQ installation directory (default is "++default_hxq_path++")")+                         putStrLn ("-l path                   set the GHC installation directory (default is "++default_system_path++")")+                         putStrLn ("Functions:  "++(foldr (\(f,_,_) r -> f++" "++r) "" functions))+            _ -> case lookup "c" env of+                   Just file -> do query <- readFile file+                                   let qf = map (\c -> if c=='\"' then '\'' else c)+                                                (foldr1 (\a r -> a++" "++r) (lines query))+                                       pr = "{-# OPTIONS_GHC -fth #-}\nmodule Main where\nimport XML.HXQ.XQuery\n\nmain = do res <- $(xq \""+                                            ++ qf ++ "\")\n          putXSeq res\n"+                                       Just ofile = lookup "o" env+                                   writeFile ofile pr+                   _ -> do session <- newSession (Just system_path)+                           dflags0 <- getSessionDynFlags session+                           (dflags1,b) <- parseDynamicFlags dflags0 ["-fglasgow-exts", "-O2", "-fth", "-fobject-code",+                                                                     --"-package HXQ", "-package ghc"]+                                                                     "-i"++hxq_path++"XML/HXQ/:"++hxq_path++"hxml-0.2"]+                           (dflags2, _) <- initPackages dflags1+                           setSessionDynFlags session dflags2+                           --load session LoadAllTargets+                           let preludeModule = mkModule (stringToPackageId "base") (mkModuleName "Prelude")+                           --xqueryModule = mkModule (stringToPackageId "HXQ") (mkModuleName "XQuery")+                           setContext session [] [preludeModule]+                           t <- guessTarget (hxq_path++"Main.hs") Nothing+                           addTarget session t+                           f <- getSessionDynFlags session+                           sf <- defaultCleanupHandler f (load session LoadAllTargets)+                           --ff <- load session (LoadDependenciesOf (mkModuleName "XQuery"))+                           case lookup "r" env of+                             Just file -> do q <- readFile file+                                             let qf = map (\c -> if c=='\"' then '\'' else c)+                                                          (foldr1 (\a r -> a++" "++r) (lines q))+                                                 query = "do result <- $(XQuery.xq \""++qf++"\"); XQuery.putXSeq result"+                                             _ <- runStmt session query SingleStep+                                             return ()+                             _ -> case lookup "p" env of+                                    Just query -> do _ <- runStmt session ("do result <- $(XML.HXQ.XQuery.xq \""++query+                                                                           ++"\"); XML.HXQ.XQuery.putXSeq result") SingleStep+                                                     return ()+                                    _ -> do putStrLn "To write an XQuery in multiple lines, wrap it in {}"+                                            evalInput (\s vs fs -> let query = "do result <- $(XML.HXQ.XQuery.xq \""++s++"\");"+                                                                               ++"XML.HXQ.XQuery.putXSeq result"+                                                                   in Control.Exception.catch (do runStmt session query SingleStep; return (vs,fs))+                                                                              (\e -> do putStrLn (show e); return (vs,fs))) [] []
HXQ.cabal view
@@ -1,12 +1,12 @@ Cabal-Version:       >= 1.2 Name:                HXQ-Version:             0.8+Version:             0.8.3 Synopsis:            A Compiler from XQuery to Haskell Description:                  HXQ is a fast and space-efficient compiler from XQuery (the standard         query language for XML) to embedded Haskell code. The translation is         based on Haskell templates. It also provides an interpreter for-        evaluating ad-hoc XQueries read from input or from files.+        evaluating XQueries from input and database connectivity using HDBC. Category:            XML Build-type:          Simple License-file:        LICENSE@@ -18,20 +18,18 @@ Homepage:            http://lambda.uta.edu/HXQ/ Extra-Source-Files:   Makefile-  HXQ.hs-  XML/HXQ/DB.hs-  XML/HXQ/XQueryDB.hs+  HXQ-unstable.hs   XQueryParser.y   Test1.hs   Test2.hs   TestDB.hs-  profile.hs   compile data-files:   index.html   data/cs.xml   data/q1.xq   data/q2.xq+  data/q3.xq   data/dblp.xq   data/dblp2.xq   data/company.sql@@ -40,13 +38,14 @@  Library   Exposed-Modules:     XML.HXQ.XQuery-  Other-Modules:       XML.HXQ.XTree, XML.HXQ.Compiler, XML.HXQ.Interpreter, XML.HXQ.Parser, XML.HXQ.Optimizer,+  Other-Modules:       XML.HXQ.XTree, XML.HXQ.Compiler, XML.HXQ.Interpreter, XML.HXQ.Parser,+                       XML.HXQ.Optimizer, XML.HXQ.DB, XML.HXQ.DBConnect,                        HXML, DTD, LLParsing, TreeBuild, XMLParse, ETree, Misc, Tree,                        XMLScanner, AssocList, PrintXML, XML   hs-source-dirs:      . hxml-0.2-  Build-Depends:       base, haskell98, array, readline, template-haskell+  Build-Depends:       base, haskell98, array, readline, template-haskell, mtl, HDBC, HDBC-sqlite3  Executable xquery   Main-is:             Main.hs   hs-source-dirs:      . hxml-0.2-  Build-Depends:       base, haskell98, array, readline, template-haskell+  Build-Depends:       base, haskell98, array, readline, template-haskell, mtl, HDBC, HDBC-sqlite3
− HXQ.hs
@@ -1,94 +0,0 @@-{------------------------------------------------------------------ The main program of the XQuery Compiler-- **** UNSTABLE *****-- Programmer: Leonidas Fegaras (fegaras@cse.uta.edu)-- Date: 05/02/2008------------------------------------------------------------------}--module Main where--import GHC-import DynFlags-import Packages-import PackageConfig-import System.IO-import XML.HXQ.XQuery-import System.Environment-import qualified Control.Exception-import XML.HXQ.Compiler(functions)-import XML.HXQ.Interpreter(evalInput)---version = "0.8"-default_system_path = "/usr/local/lib/ghc-6.8.2"-default_hxq_path = "./"---parseEnv :: [String] -> [(String,String)]-parseEnv [] = [("hxq",default_hxq_path),("ghc",default_system_path),("o","Temp.hs")]-parseEnv ("-help":xs) = ("help",""):(parseEnv xs)-parseEnv ("-c":file:xs) = ("c",file):(parseEnv xs)-parseEnv ("-o":file:xs) = ("o",file):(parseEnv xs)-parseEnv ("-p":query:file:xs) = ("p","doc('"++file++"')"++query):(parseEnv xs)-parseEnv ("-h":path:xs) = ("hxq",path):(parseEnv xs)-parseEnv ("-l":path:xs) = ("ghc",path):(parseEnv xs)-parseEnv (('-':x):_) = error ("Unrecognized option -"++x++". Use -help.")-parseEnv (file:xs) = ("r",file):(parseEnv xs)---main = do putStrLn ("HXQ: XQuery Compiler version "++version)-          senv <- getArgs-          let env = parseEnv senv-              Just system_path = lookup "ghc" env-              Just hxq_path = lookup "hxq" env-          case lookup "help" env of-            Just _ -> do putStrLn "Command line options and files:"-                         putStrLn "xquery-file               compile and run the XQuery in xquery-file"-                         putStrLn "-c xquery-file            compile the XQuery in xquery-file into Haskell code"-                         putStrLn "-o haskell-file           set the Haskell file for -c (default is Temp.hs)"-                         putStrLn "-p XPath-query xml-file   compile and run the XPath query against the xml-file"-                         putStrLn ("-h path                   set the HXQ installation directory (default is "++default_hxq_path++")")-                         putStrLn ("-l path                   set the GHC installation directory (default is "++default_system_path++")")-                         putStrLn ("Functions:  "++(foldr (\(f,_,_) r -> f++" "++r) "" functions))-            _ -> case lookup "c" env of-                   Just file -> do query <- readFile file-                                   let qf = map (\c -> if c=='\"' then '\'' else c)-                                                (foldr1 (\a r -> a++" "++r) (lines query))-                                       pr = "{-# OPTIONS_GHC -fth #-}\nmodule Main where\nimport XML.HXQ.XQuery\n\nmain = do res <- $(xq \""-                                            ++ qf ++ "\")\n          putXSeq res\n"-                                       Just ofile = lookup "o" env-                                   writeFile ofile pr-                   _ -> do session <- newSession (Just system_path)-                           dflags0 <- getSessionDynFlags session-                           (dflags1,b) <- parseDynamicFlags dflags0 ["-fglasgow-exts", "-O2", "-fth", "-fobject-code",-                                                                     --"-package HXQ", "-package ghc"]-                                                                     "-i"++hxq_path++"XML/HXQ/:"++hxq_path++"hxml-0.2"]-                           (dflags2, _) <- initPackages dflags1-                           setSessionDynFlags session dflags2-                           --load session LoadAllTargets-                           let preludeModule = mkModule (stringToPackageId "base") (mkModuleName "Prelude")-                           --xqueryModule = mkModule (stringToPackageId "HXQ") (mkModuleName "XQuery")-                           setContext session [] [preludeModule]-                           t <- guessTarget (hxq_path++"Main.hs") Nothing-                           addTarget session t-                           f <- getSessionDynFlags session-                           sf <- defaultCleanupHandler f (load session LoadAllTargets)-                           --ff <- load session (LoadDependenciesOf (mkModuleName "XQuery"))-                           case lookup "r" env of-                             Just file -> do q <- readFile file-                                             let qf = map (\c -> if c=='\"' then '\'' else c)-                                                          (foldr1 (\a r -> a++" "++r) (lines q))-                                                 query = "do result <- $(XQuery.xq \""++qf++"\"); XQuery.putXSeq result"-                                             _ <- runStmt session query SingleStep-                                             return ()-                             _ -> case lookup "p" env of-                                    Just query -> do _ <- runStmt session ("do result <- $(XML.HXQ.XQuery.xq \""++query-                                                                           ++"\"); XML.HXQ.XQuery.putXSeq result") SingleStep-                                                     return ()-                                    _ -> do putStrLn "To write an XQuery in multiple lines, wrap it in {}"-                                            evalInput (\s vs fs -> let query = "do result <- $(XML.HXQ.XQuery.xq \""++s++"\");"-                                                                               ++"XML.HXQ.XQuery.putXSeq result"-                                                                   in Control.Exception.catch (do runStmt session query SingleStep; return (vs,fs))-                                                                              (\e -> do putStrLn (show e); return (vs,fs))) [] []
Main.hs view
@@ -2,11 +2,10 @@ - - The main program of the XQuery interpreter - Programmer: Leonidas Fegaras (fegaras@cse.uta.edu)-- Date: 05/02/2008+- Date: 06/10/2008 - ---------------------------------------------------------------} -{-# OPTIONS_GHC -fth #-}  module Main where @@ -16,7 +15,7 @@ import XML.HXQ.Interpreter(evalInput,xqueryE) import XML.HXQ.XQuery -version = "0.8"+version = "0.8.3"   parseEnv :: [String] -> [(String,String)]@@ -24,24 +23,29 @@ parseEnv ("-help":xs) = ("help",""):(parseEnv xs) parseEnv ("-c":file:xs) = ("c",file):(parseEnv xs) parseEnv ("-o":file:xs) = ("o",file):(parseEnv xs)+parseEnv ("-db":file:xs) = ("db",file):(parseEnv xs)+parseEnv ("-v":xs) = ("v",""):(parseEnv xs) parseEnv ("-p":query:file:xs) = ("p","doc('"++file++"')"++query):(parseEnv xs) parseEnv (('-':x):_) = error ("Unrecognized option -"++x++". Use -help.") parseEnv (file:xs) = ("r",file):(parseEnv xs)  -main = do putStrLn ("HXQ: XQuery Interpreter version "++version++". Use -help for help.")-          senv <- getArgs+main = do senv <- getArgs           let env = parseEnv senv               Just system_path = lookup "ghc" env               Just hxq_path = lookup "hxq" env+              Just dbname = lookup "db" env+              verbose = case lookup "v" env of Nothing -> False; _ -> True           case lookup "help" env of             Just _ -> do putStrLn "Command line options and files:"                          putStrLn "   xquery-file               interpret the XQuery in xquery-file"+                         putStrLn "   -db file-path             use the relational database in file-path during querying"                          putStrLn "   -c xquery-file            compile the XQuery in xquery-file into Haskell code"                          putStrLn "   -o haskell-file           set the Haskell file for -c (default is Temp.hs)"                          putStrLn "   -p XPath-query xml-file   interpret the XPath query against the xml-file"-                         putStrLn "Without options, it reads and interprets the input:"-                         putStrLn "   The input may be an XQuery or a declare variable or function"+                         putStrLn "   -v                        verbose information"+                         putStrLn "Without an xquery-file, it reads and interprets the input"+                         putStrLn "   The input may be an XQuery or a declare variable/function"                          putStrLn "   To write an XQuery in multiple lines, wrap it in {}"                          putStrLn ("Functions:  "++(foldr (\(f,_,_) r -> f++" "++r) "" functions))             _ -> case lookup "c" env of@@ -53,12 +57,32 @@                                        Just ofile = lookup "o" env                                    writeFile ofile pr                    _ -> case lookup "r" env of-                          Just file -> do result <- xfile file-                                          putXSeq result+                          Just file -> case lookup "db" env of+                                         Just filepath -> do db <- connect filepath+                                                             result <- xfileDB file db+                                                             disconnect db+                                                             putXSeq result+                                         _ -> do query <- readFile file+                                                 (result,_,_) <- xqueryE query [] [] (\sql -> return []) verbose+                                                 putXSeq result                           _ -> case lookup "p" env of-                                 Just query -> do result <- xquery query+                                 Just query -> do (result,_,_) <- xqueryE query [] [] (\sql -> return []) verbose                                                   putXSeq result-                                 _ -> evalInput (\s vs fs-> Control.Exception.catch (do (result,nvs,nfs) <- xqueryE s vs fs-                                                                                        putXSeq result-                                                                                        return (nvs,nfs))-                                                                              (\e -> do putStrLn (show e); return (vs,fs))) [] []+                                 _ -> do putStrLn ("HXQ: XQuery Interpreter version "++version++". Use -help for help.")+                                         case lookup "db" env of+                                           Just filepath+                                               -> do db <- connect filepath+                                                     evalInput (\s vs fs-> Control.Exception.catch+                                                                          (do (result,nvs,nfs) <- xqueryE s vs fs+                                                                                                  (\sql -> do stmt <- prepareSQL db sql+                                                                                                              return [XStmt stmt]) verbose+                                                                              putXSeq result+                                                                              return (nvs,nfs))+                                                                          (\e -> do putStrLn (show e); return (vs,fs))) [] []+                                                     disconnect db+                                           _ -> evalInput (\s vs fs-> Control.Exception.catch+                                                                      (do (result,nvs,nfs) <- xqueryE s vs fs+                                                                                                 (\_ -> error "Missing Database Connection") verbose+                                                                          putXSeq result+                                                                          return (nvs,nfs))+                                                                      (\e -> do putStrLn (show e); return (vs,fs))) [] []
Makefile view
@@ -1,6 +1,6 @@ hxml = hxml-0.2 hxq = XML/HXQ-options = -O2 -fvia-C+options = -O2 parser = $(hxq)/Parser.hs  # xquery interpreter@@ -8,8 +8,8 @@ 	ghc $(options) -i$(hxml) --make Main.hs -o xquery  # on-the-fly compiler: unstable; use xquery instead-hxqc:   $(parser) HXQ.hs-	ghc $(options) -i$(hxml) -optl-s -package ghc --make HXQ.hs -o hxqc+hxqc:   $(parser) HXQ-unstable.hs+	ghc $(options) -i$(hxml) -optl-s -package ghc --make HXQ-unstable.hs -o hxqc  # generate the XQuery parser using happy $(parser): XQueryParser.y@@ -23,25 +23,23 @@ 	ghc $(options) -i$(hxml) --make Test2.hs -o a.out 	time ./a.out +RTS -H20m -testdb: $(parser) TestDB.hs+test3:  $(parser) TestDB.hs 	ghc $(options) -i$(hxml) --make TestDB.hs -o a.out 	./a.out -# get in the ghci interpreter and load HXQ+test4:  $(parser) TestDB2.hs+	ghc $(options) -i$(hxml) --make TestDB2.hs -o a.out+	./a.out++# run in the ghci interpreter and load HXQ ghci:   $(parser) 	ghci -fth -i$(hxml) Main.hs -# heap profile of a simple XQuery against dblp.xml-profile: $(parser) profile.hs-	ghc -O2 -i$(hxml) -prof -auto-all --make profile.hs -o a-	./a +RTS -hy -p -H20m-	hp2ps -color a.hp- # create the cabal distribution-cabal:	clean $(parser)+cabal:	$(parser) 	runhaskell Setup.lhs configure --ghc --user --prefix=$(HOME) 	runhaskell Setup.lhs build 	runhaskell Setup.lhs sdist  clean:-	/bin/rm -f *~ data/*~ $(hxq)/*~ *.o *.hi $(hxq)/*.o $(hxq)/*.hi $(hxml)/*.o $(hxml)/*.hi $(parser) *.stat *.prof *.ps *.aux *.hp xquery hxqc Temp.hs a.out a+	/bin/rm -f *~ data/*~ $(hxq)/*~ *.o *.hi $(hxq)/*.o $(hxq)/*.hi $(hxml)/*.o $(hxml)/*.hi $(parser) xquery hxqc Temp.hs a.out
Test1.hs view
@@ -13,12 +13,12 @@ import XML.HXQ.XQuery  -f(d,s) = $(xe "<student dept='{$d/text()}'>{$s//firstname/text(),' ',$s//lastname/text()}</student>")+f(d,s) = $(xe "<student dept='{$d/text()}'>{$s//firstname/text(),$s//lastname/text()}</student>")  main = do a <- $(xq ("  for $s in doc('data/cs.xml')//gradstudent          "                 ++"     order by $s/gpa descending, $s//lastname           "-                ++"     return <student>{$s//firstname/text(),' ',         "-                ++"                      $s//lastname/text(),' ',          "+                ++"     return <student>{$s//firstname/text(),             "+                ++"                      $s//lastname/text(),              "                 ++"                      $s/gpa/text()}</student>          "))           putXSeq a           let query name = $(xq " doc('data/cs.xml')//gradstudent[.//lastname = $name]//firstname ")@@ -31,9 +31,8 @@                   ++"       return f($d//deptname,$s)                      "                   ++"   }</good-students>                                  "))           putXSeq c-          let q file = $(xq ("  let $d := doc($file)//gradstudent          "-                         ++"    return ($d/../deptname,count($d))          "))-          d <- q $(xe " 'data/cs.xml' ")+          d <- $(xq ("    let $d := doc('data/cs.xml')//gradstudent  "+                   ++"    return ($d/../deptname,count($d))          "))           putXSeq d           putStrLn "Type an XQuery:"           iquery <- getLine        -- read an XQuery from input
Test2.hs view
@@ -14,14 +14,14 @@ import XML.HXQ.XQuery  -f(x,y) = $(xe "<a>{$x,', ',$y}</a>")+f(x,y) = $(xe "<a>{$x,$y}</a>")  main = do a <- $(xq ("<result>{                                                               "                  ++"     for $x at $i in doc('data/dblp.xml')//inproceedings                  "                  ++"     where $x/author = 'Leonidas Fegaras'                                 "                  ++"     order by $x/year descending                                          "-                 ++"     return <paper>{ $i, ') ', $x/booktitle/text(),                       "-                 ++"                     ': ', $x/title/text()                                "+                 ++"     return <paper>{ $i, $x/booktitle/text(),                             "+                 ++"                     ':', $x/title/text()                                 "                  ++"            }</paper>                                                     "                  ++"  }</result>                                                              "))           putXSeq a
TestDB.hs view
@@ -1,10 +1,10 @@ {-------------------------------------------------------------- --- A main program to test XQuery with Sqlite database connectivity+- A main program to test XQuery connected to a Sqlite database - To create the database load the file data/company.sql in sqlite3 - - Programmer: Leonidas Fegaras (fegaras@cse.uta.edu)-- Date: 05/12/2008+- Date: 05/21/2008 - ---------------------------------------------------------------} @@ -12,17 +12,15 @@  module Main where -import XML.HXQ.XQueryDB-import Database.HDBC.Sqlite3+import XML.HXQ.XQuery  -main = do db <- connectSqlite3 "myDB"-          e <- $(xqdb ("  let $ln := 'English'                              "-                     ++"  for $r in sql('  select e.fname, d.dname          "+main = do db <- connect "myDB"+          e <- $(xqdb ("  for $r in sql('  select e.fname, d.dname          "                      ++"                   from employee e, department d    "                      ++"                   where e.dno = d.dnumber          "                      ++"                     and e.lname = ?           ',   "-                     ++"                $ln)                                "+                     ++"                'English')                          "                      ++"  return <result>{$r/fname,$r/dname}</result>       ")) db           putXSeq e           disconnect db
XML/HXQ/Compiler.hs view
@@ -4,7 +4,7 @@ - Programmer: Leonidas Fegaras - Email: fegaras@cse.uta.edu - Web: http://lambda.uta.edu/-- Creation: 02/15/08, last update: 05/12/08+- Creation: 02/15/08, last update: 06/02/08 -  - Copyright (c) 2008 by Leonidas Fegaras, the University of Texas at Arlington. All rights reserved. - This material is provided as is, with absolutely no warranty expressed or implied.@@ -20,26 +20,36 @@  import Data.List import Control.Monad-import Char(isDigit)+import Char(isDigit,toLower) import List(sortBy) import Language.Haskell.TH+import Database.HDBC import XMLParse(parseDocument) import HXML(AttList) import XML.HXQ.Parser import XML.HXQ.XTree import XML.HXQ.Optimizer+import XML.HXQ.DB+import XML.HXQ.DBConnect   {--------------- XPath Steps ---------------------------------------------------------}  +current_step :: Tag -> XTree -> XSeq+current_step m x+    = case x of+        XElem k _ _ _ | (k==m || m=="*") -> [x]+        _ -> []++ -- XPath step /tag or /* child_step :: Tag -> XTree -> XSeq child_step m x     = case x of-        (XElem _ _ _ bs)+        XElem _ _ _ bs             -> foldr (\b s -> case b of-                                (XElem k _ _ _) | (k==m || m=="*") -> b:s+                                XElem k _ _ _ | (k==m || m=="*") -> b:s                                 _ -> s) [] bs         _ -> [] @@ -108,8 +118,11 @@ foldir c n [] i = n foldir c n (x:xs) i = c x i (foldir c n xs (i+1)) + trueXT = XBool True+falseXT = XBool False + readNum :: String -> Maybe XTree readNum cs = case span isDigit cs of                (n,[]) -> Just (XInt (read n))@@ -118,18 +131,18 @@                                  _ -> Nothing                _ -> Nothing + text :: XSeq -> XSeq text xs = foldr (\x r -> case x of-                           XElem _ _ _ [z@(XText _)] -> z:r-                           XElem _ _ _ [z@(XInt _)] -> z:r-                           XElem _ _ _ [z@(XFloat _)] -> z:r-                           XElem _ _ _ [z@(XBool _)] -> z:r+                           XElem _ _ _ zs -> (filter (\a -> case a of XText _ -> True; XInt _ -> True;+                                                                      XFloat _ -> True; XBool _ -> True; _ -> False) zs)++r                            XText _ -> x:r                            XInt _ -> x:r                            XFloat _ -> x:r                            XBool _ -> x:r                            _ -> r) [] xs + toString :: XSeq -> [String] toString xs = map (\x -> case x of                             XText t -> t@@ -138,6 +151,14 @@                            XBool n -> show n)                   (text xs) ++-- concatenate text with no padding (for element content)+appendText :: [XSeq] -> XSeq+appendText [] = []+appendText [x] = x+appendText (x:xs) = x++[XNoPad]++appendText xs++ toNum :: XSeq -> XSeq toNum xs = foldr (\x r -> case x of                             XInt n -> x:r@@ -147,6 +168,7 @@                                          _ -> r                             _ -> r) [] (text xs) + toFloat :: XTree -> Float toFloat (XText s) = case readNum s of                       Just (XInt n) -> fromIntegral n@@ -156,23 +178,31 @@ toFloat (XFloat n) = n toFloat x = error("Cannot convert to a float: "++(show x)) + mean :: (Fractional t) => [t] -> t mean = uncurry (/) . foldl' (\(!s, !n) x -> (s+x, n+1)) (0,0.0) + contains :: String -> String -> Bool-contains xs ys | ((take (length ys) xs) == ys) = True-contains (_:xs) ys = contains xs ys-contains [] ys = False+contains text word+    = let len = length word+          c xs | ((take len xs) == word) = True+          c (_:xs) = c xs+          c _ = False+      in c text + distinct :: Eq a => [a] -> [a] distinct = foldl (\r a -> if elem a r then r else r++[a]) [] + arithmetic :: (Float -> Float -> Float) -> XTree -> XTree -> XTree arithmetic op (XInt n) (XInt m) = XInt (round (op (fromIntegral n) (fromIntegral m))) arithmetic op (XFloat n) (XFloat m) = XFloat (op n m) arithmetic op (XFloat n) (XInt m) = XFloat (op n (fromIntegral m)) arithmetic op (XInt n) (XFloat m) = XFloat (op (fromIntegral n) m) + compareXTrees :: XTree -> XTree -> Ordering compareXTrees (XElem _ _ _ _) _ = EQ compareXTrees _ (XElem _ _ _ _) = EQ@@ -183,6 +213,7 @@ compareXTrees (XText n) (XText m) = compare n m compareXTrees x y = compare (toFloat x) (toFloat y) + strictCompareOne [XInt n] [XInt m] = compare n m strictCompareOne [XFloat n] [XFloat m] = compare n m strictCompareOne [XFloat n] [XInt m] = compare n (fromIntegral m)@@ -211,6 +242,7 @@                  then LT               else EQ + conditionTest :: XSeq -> Bool conditionTest [] = False conditionTest [XText ""] = False@@ -221,7 +253,8 @@  -- XPath steps paths :: [(Tag,Q Exp)]-paths = [ ( "child_step", [| child_step |] ),+paths = [ ( "current_step", [| current_step |] ),+          ( "child_step", [| child_step |] ),           ( "descendant_step", [| descendant_step |] ),           ( "attribute_step", [| attribute_step |] ),           ( "attribute_descendant_step", [| attribute_descendant_step |] )@@ -234,17 +267,19 @@ -- but here we make sure they are unfolded and fused with the rest of the query functions :: [(Tag,Int,Function)] functions = [ ( "=", 2, \[xs,ys] -> [| [ trueXT | x <- text $xs, y <- text $ys, compareXTrees x y == EQ ] |] ),-              ( "!=", 2, \[xs,ys] -> [| if null [ trueXT | x <- text $xs, y <- text $ys, compareXTrees x y == EQ ] then [trueXT] else [] |] ),+              ( "!=", 2, \[xs,ys] -> [| if null [ trueXT | x <- text $xs, y <- text $ys, compareXTrees x y == EQ ]+                                        then [trueXT]+                                        else [falseXT] |] ),               ( ">", 2, \[xs,ys] -> [| [ trueXT | x <- text $xs, y <- text $ys, compareXTrees x y == GT ] |] ),               ( "<", 2, \[xs,ys] -> [| [ trueXT | x <- text $xs, y <- text $ys, compareXTrees x y == LT ] |] ),               ( ">=", 2, \[xs,ys] -> [| [ trueXT | x <- text $xs, y <- text $ys, compareXTrees x y `elem` [GT,EQ] ] |] ),               ( "<=", 2, \[xs,ys] -> [| [ trueXT | x <- text $xs, y <- text $ys, compareXTrees x y `elem` [LT,EQ] ] |] ),-              ( "eq", 2, \[xs,ys] -> [| if strictCompare $xs $ys == EQ then [trueXT] else [] |] ),-              ( "neq", 2, \[xs,ys] -> [| if strictCompare $xs $ys /= EQ then [trueXT] else [] |] ),-              ( "lt", 2, \[xs,ys] -> [| if strictCompare $xs $ys == LT then [trueXT] else [] |] ),-              ( "gt", 2, \[xs,ys] -> [| if strictCompare $xs $ys == GT then [trueXT] else [] |] ),-              ( "le", 2, \[xs,ys] -> [| if strictCompare $xs $ys `elem` [LT,EQ] then [trueXT] else [] |] ),-              ( "ge", 2, \[xs,ys] -> [| if strictCompare $xs $ys `elem` [GT,EQ] then [trueXT] else [] |] ),+              ( "eq", 2, \[xs,ys] -> [| if strictCompare $xs $ys == EQ then [trueXT] else [falseXT] |] ),+              ( "neq", 2, \[xs,ys] -> [| if strictCompare $xs $ys /= EQ then [trueXT] else [falseXT] |] ),+              ( "lt", 2, \[xs,ys] -> [| if strictCompare $xs $ys == LT then [trueXT] else [falseXT] |] ),+              ( "gt", 2, \[xs,ys] -> [| if strictCompare $xs $ys == GT then [trueXT] else [falseXT] |] ),+              ( "le", 2, \[xs,ys] -> [| if strictCompare $xs $ys `elem` [LT,EQ] then [trueXT] else [falseXT] |] ),+              ( "ge", 2, \[xs,ys] -> [| if strictCompare $xs $ys `elem` [GT,EQ] then [trueXT] else [falseXT] |] ),               ( "<<", 2, \[xs,ys] -> [| [ trueXT | XElem _ _ ox _ <- $xs, XElem _ _ oy _  <- $ys, ox < oy ] |] ),               ( ">>", 2, \[xs,ys] -> [| [ trueXT | XElem _ _ ox _ <- $xs, XElem _ _ oy _  <- $ys, ox > oy ] |] ),               ( "is", 2, \[xs,ys] -> [| [ trueXT | XElem _ _ ox _ <- $xs, XElem _ _ oy _  <- $ys, ox == oy ] |] ),@@ -256,10 +291,10 @@               ( "mod", 2, \[xs,ys] -> [| [ XInt (mod x y) | (XInt x) <- toNum $xs, (XInt y) <- toNum $ys ] |] ),               ( "uplus", 1, \[xs] -> [| [ x | x <- toNum $xs ] |] ),               ( "uminus", 1, \[xs] -> [| [ case x of XInt n -> XInt (-n); XFloat n -> XFloat (-n) | x <- toNum $xs ] |] ),-              ( "and", 2, \[xs,ys] -> [| if (conditionTest $xs) && (conditionTest $ys) then [trueXT] else [] |] ),-              ( "or", 2, \[xs,ys] -> [| if (conditionTest $xs) || (conditionTest $ys) then [trueXT] else [] |] ),-              ( "not", 1, \[xs] -> [| if (conditionTest $xs) then [] else [trueXT] |] ),-              ( "some", 1, \[xs] -> [| if (conditionTest $xs) then [trueXT] else [] |] ),+              ( "and", 2, \[xs,ys] -> [| if (conditionTest $xs) && (conditionTest $ys) then [trueXT] else [falseXT] |] ),+              ( "or", 2, \[xs,ys] -> [| if (conditionTest $xs) || (conditionTest $ys) then [trueXT] else [falseXT] |] ),+              ( "not", 1, \[xs] -> [| if (conditionTest $xs) then [falseXT] else [trueXT] |] ),+              ( "some", 1, \[xs] -> [| if (conditionTest $xs) then [trueXT] else [falseXT] |] ),               ( "count", 1, \[xs] -> [| [ XInt (length $xs) ] |] ),               ( "sum", 1, \[xs] -> [| [ XFloat (sum [ toFloat x | x <- toNum $xs ]) ] |] ),               ( "avg", 1, \[xs] -> [| [ XFloat (mean [ toFloat x | x <- toNum $xs ]) ] |] ),@@ -269,7 +304,8 @@               ( "text", 1, \[xs] -> [| text $xs |] ),               ( "string", 1, \[xs] -> [| text $xs |] ),               ( "data", 1, \[xs] -> [| text $xs |] ),-              ( "node", 1, \[xs] -> [| $xs |] ),+              ( "node", 1, \[xs] -> [| [ w | w@(XElem _ _ _ _) <- $xs ] |] ),+              ( "exists", 1, \[xs] -> [| [ XBool (not (null $xs)) ] |] ),               ( "empty", 0, \[] -> [| [] |] ),               ( "true", 0, \[] -> [| [trueXT] |] ),               ( "false", 0, \[] -> [| [] |] ),@@ -278,8 +314,9 @@               ( "attribute", 2, \[tags,xs] -> [| [ z | tag <- toString $tags, x <- $xs, z <- attribute_step tag x ] |] ),               ( "name", 1, \[xs] -> [| [ XText tag | XElem tag _ _ _ <- $xs ] |] ),               ( "contains", 2, \[xs,text] -> [| [ trueXT | x <- toString $xs, t <- toString $text, contains x t ] |] ),+              ( "substring", 3, \[xs,n1,n2] -> [| [ XText (take m2 (drop (m1-1) x)) | x <- toString $xs,+                                                    XInt m1 <- toNum $n1, XInt m2 <- toNum $n2 ] |] ),               ( "concatenate", 2, \[xs,ys] -> [| $xs ++ $ys |] ),-              ( "concat", 2, \[xs,ys] -> [| [ XText (showXS ($xs ++ $ys)) ] |] ),               ( "distinct-values", 1, \[xs] -> [| distinct $xs |] ),               ( "union", 2, \[xs,ys] -> [| distinct ($xs ++ $ys) |] ),               ( "intersect", 2, \[xs,ys] -> [| filter (\x -> elem x $ys) $xs |] ),@@ -291,10 +328,11 @@ -- functions to be used by the interpreter -- when evaluated, it gives [(String,Int,[XSeq]->XSeq)] iFunctions :: Q Exp-iFunctions = foldr (\(fname,len,f) r -> let vars = map (\i -> mkName ("v_"++(show i))) [1..len]-                                            entry = tupE [litE (StringL fname),litE (IntegerL (toInteger len)),-                                                          lamE [listP (map varP vars)] (f (map varE vars))]-                                        in [| $entry : $r |]) [| [] |] functions+iFunctions = foldr (\(fname,len,f) r+                        -> let vars = map (\i -> mkName ("v_"++(show i))) [1..len]+                               entry = tupE [litE (StringL fname),litE (IntegerL (toInteger len)),+                                             lamE [listP (map varP vars)] (f (map varE vars))]+                           in [| $entry : $r |]) [| [] |] functions   -- XPath steps to be used by the interpreter@@ -424,9 +462,9 @@           -> position       Ast "call" [Avar "last"]           -> last-      Ast "step" [Ast "child_step" [tag, Avar "."]]+      Ast "child_step" [tag, Avar "."]           | effective_axis /= ""-          -> compile (Ast "step" [Ast effective_axis [tag, Avar "."]]) context position last ""+          -> compile (Ast effective_axis [tag, Avar "."]) context position last ""       Ast "step" ((Ast "descendant_any" (body:tags)):predicates)           -> let bc = compile body context position last effective_axis                  ts = listE (map (\(Avar tag) -> litE (stringL tag)) tags)@@ -438,12 +476,23 @@                  tc = litE (stringL tag)              in [| foldr (\x r -> $(compilePredicates predicates [| $(findV path_step paths) $tc x |] True)++r)                          [] $bc |]+      Ast "descendant_any" (body:tags)+          -> let bc = compile body context position last effective_axis+                 ts = listE (map (\(Avar tag) -> litE (stringL tag)) tags)+             in [| foldr (\x r -> (descendant_any_with_tagged_children $ts x)++r) [] $bc |]+      Ast path_step [Astring tag,body]+          |  memV path_step paths+          -> let bc = compile body context position last effective_axis+                 tc = litE (stringL tag)+             in [| foldr (\x r -> ($(findV path_step paths) $tc x)++r) [] $bc |]       Ast "step" [exp]           -> compile exp context position last effective_axis       Ast "step" (exp:predicates)           -> compilePredicates predicates (compile exp context position last effective_axis) True       Ast "predicate" [condition,body]           -> compilePredicates [condition] (compile body context position last effective_axis) True+      Ast "append" args+          -> [| appendText $(listE (map (\x -> compile x context position last effective_axis) args)) |]       Ast "call" ((Avar f):args)           -> callF f (map (\x -> compile x context position last effective_axis) args)       Ast "construction" [Astring tag,Ast "attributes" [],body]@@ -454,7 +503,7 @@           -> let alc = foldr (\(Ast "pair" [a,v]) r                                   -> let ac = compile a context position last effective_axis                                          vc = compile v context position last effective_axis-                                     in [| (qName $ac,showXS (text $vc)) : $r |]) [| [] |] al+                                     in [| (qName $ac,showXS $vc) : $r |]) [| [] |] al                  ct = compile tag context position last effective_axis                  bc = compile body context position last effective_axis              in [| [ XElem (qName $ct) $alc 0 $bc ] |]@@ -473,7 +522,7 @@                  f = lamE [varP (mkName var)] (lamE [varP (mkName ivar)] [| \r -> $b ++ r |])                  p = maxPosition (Avar ivar) body                  ns = if p > 0              -- there is a top-k like restriction-                      then Ast "step" [source,Ast "call" [Avar "<=",Ast "step" [pathPosition],Aint p]]+                      then Ast "step" [source,Ast "call" [Avar "<=",pathPosition,Aint p]]                       else source                  s = compile ns context position last effective_axis              in [| foldir (\x i -> $f [x] [XInt i]) [] $s 1 |]@@ -553,9 +602,9 @@           -> [| return $position |]       Ast "call" [Avar "last"]           -> [| return $last |]-      Ast "step" [Ast "child_step" [tag, Avar "."]]+      Ast "child_step" [tag, Avar "."]           | effective_axis /= ""-          -> compileM (Ast "step" [Ast effective_axis [tag, Avar "."]]) context position last ""+          -> compileM (Ast effective_axis [tag, Avar "."]) context position last ""       Ast "step" ((Ast "descendant_any" (body:tags)):predicates)           -> let bc = compileM body context position last effective_axis                  ts = listE (map (\(Avar tag) -> litE (stringL tag)) tags)@@ -571,6 +620,17 @@                       foldr (\x r -> (liftM2 (++)) $(compilePredicatesM predicates                                                            [| $(findV path_step paths) $tc x |] True) r)                             (return []) vs |]+      Ast "descendant_any" (body:tags)+          -> let bc = compileM body context position last effective_axis+                 ts = listE (map (\(Avar tag) -> litE (stringL tag)) tags)+             in [| do vs <- $bc+                      return (foldr (\x r -> (descendant_any_with_tagged_children $ts x)++r) [] vs) |]+      Ast path_step [Astring tag,body]+          |  memV path_step paths+          -> let bc = compileM body context position last effective_axis+                 tc = litE (stringL tag)+             in [| do vs <- $bc+                      return (foldr (\x r -> ($(findV path_step paths) $tc x)++r) [] vs) |]       Ast "step" [exp]           -> compileM exp context position last effective_axis       Ast "step" (exp:predicates)@@ -582,6 +642,10 @@       Ast "executeSQL" [Avar stmt,args]           -> [| do as <- $(compileM args context position last effective_axis)                    $(varE (mkName "executeSQL")) $(varE (mkName stmt)) as |]+      Ast "append" args+          -> let binds = zipWith (\i x -> (mkName ("x"++(show i)),x)) [1..(length args)] args+             in foldr (\(n,x) r -> [| $(compileM x context position last effective_axis) >>= $(lamE [varP n] r) |])+                      [| return (appendText $(listE (map (\(n,_) -> varE n) binds))) |] binds       Ast "call" ((Avar f):args)           -> let binds = zipWith (\i x -> (mkName ("x"++(show i)),x)) [1..(length args)] args              in foldr (\(n,x) r -> [| $(compileM x context position last effective_axis) >>= $(lamE [varP n] r) |])@@ -596,7 +660,7 @@                                   -> [| do ac <- $(compileM a context position last effective_axis)                                            vc <- $(compileM v context position last effective_axis)                                            s <- $r-                                           return ((qName ac,showXS (text vc)):s) |]) [| return [] |] al+                                           return ((qName ac,showXS vc):s) |]) [| return [] |] al                  ct = compileM tag context position last effective_axis                  bc = compileM body context position last effective_axis              in [| do a <- $alc@@ -618,7 +682,7 @@                  f = lamE [varP (mkName var)] (lamE [varP (mkName ivar)] [| (liftM2 (++)) $b |])                  p = maxPosition (Avar ivar) body                  ns = if p > 0              -- there is a top-k like restriction-                      then Ast "step" [source,Ast "call" [Avar "<=",Ast "step" [pathPosition],Aint p]]+                      then Ast "step" [source,Ast "call" [Avar "<=",pathPosition,Aint p]]                       else source                  s = compileM ns context position last effective_axis              in [| do vs <- $s@@ -647,7 +711,7 @@  -- functions that need IO interaction (document reader, DB access, etc) ioSources :: [ String ]-ioSources = ["executeSQL","doc","fn:doc","sql","fn:sql"]+ioSources = ["executeSQL","doc","fn:doc","sql","fn:sql","publish","fn:publish"]   -- collect all input documents and assign them a unique number@@ -657,6 +721,10 @@              Ast "call" [Avar nm,file]                  | elem nm ["doc","fn:doc"]                  -> (Avar ("_doc"++(show count)), count+1, [("_doc"++(show count),file)])+             Ast "call" [Avar nm,sql]+                 | elem nm ["sql","fn:sql"]+                 -> (Ast "executeSQL" [Avar ("_sql"++(show count)),Ast "call" [Avar "empty"]], count+1,+                     [("_sql"++(show count),Ast "prepareSQL" [sql])])              Ast "call" [Avar nm,sql,args]                  | elem nm ["sql","fn:sql"]                  -> (Ast "executeSQL" [Avar ("_sql"++(show count)),args], count+1,@@ -683,6 +751,7 @@ liftIOSources query     = let (ast,_,ns) = pullIOSources query 0           f x = case x of+                  Ast nm _ | elem nm ["attributes"] -> x                   Ast _ _ | noIO x -> Ast "nonIO" [x]                   _ -> case x of                          Ast "call" ((Avar nm):args)@@ -714,8 +783,8 @@     = letE [valD (varP (mkName v)) (normalB (compileAst u)) []]            (compileQuery xs) compileQuery [query]-    = let (ast,ns) = liftIOSources query-          code = compileAstM ast+    = let (ast,ns) = liftIOSources (optimize query)+          code = compileM ast undef1 undef2 undef3 ""       in foldl (\r (n,e) -> let d = lamE [varP (mkName n)] r                             in case e of                                  Avar m -> [| $d $(varE (mkName m)) |]@@ -729,7 +798,7 @@                [| $code |] ns  --- | Debugging: display the AST and the Haskell code of an input XQuery+-- Debugging: display the AST and the Haskell code of an input XQuery cq :: String -> IO () cq query = do putStrLn "Abstract Syntax Tree:"               let ast = parse (scan query)@@ -737,9 +806,9 @@               let opt = optimize (last ast)               putStrLn "Optimized AST:"               putStrLn (show opt)-              putStrLn "Haskell Code:"-              let code = compileQuery ast-              runQ code >>= putStrLn.pprint+              --putStrLn "Haskell Code:"+              --let code = compileQuery ast+              --runQ code >>= putStrLn.pprint   -- | Run an XQuery expression that does not read XML documents.@@ -757,4 +826,4 @@ -- | Run an XQuery that reads XML documents and queries databases. -- When evaluated, it returns (IConnection conn) => conn -> IO XSeq. xqdb :: String -> Q Exp-xqdb query = (lamE [varP (mkName "_db")] (xq query))+xqdb query = lamE [varP (mkName "_db")] (compileQuery (parse (scan query)))
XML/HXQ/DB.hs view
@@ -1,10 +1,10 @@ {------------------------------------------------------------------------------------- --- HDBC connectivity+- Database connectivity using HDBC - Programmer: Leonidas Fegaras - Email: fegaras@cse.uta.edu - Web: http://lambda.uta.edu/-- Creation: 05/12/08, last update: 05/12/08+- Creation: 05/12/08, last update: 06/12/08 -  - Copyright (c) 2008 by Leonidas Fegaras, the University of Texas at Arlington. All rights reserved. - This material is provided as is, with absolutely no warranty expressed or implied.@@ -16,8 +16,13 @@  module XML.HXQ.DB where +import Char(isSpace,toLower)+import Control.Monad.State import Database.HDBC import XML.HXQ.XTree+import XMLParse(XMLEvent(..),parseDocument)+import HXML(AttList)+import XML.HXQ.Parser   sql2xml :: SqlValue -> XTree@@ -46,6 +51,8 @@       XInt n -> SqlInteger (toInteger n)       XFloat n -> SqlString (show n)       XBool n -> SqlBool n+      XElem n _ _ [x] -> xml2sql x+      _ -> error ("Cannot convert "++show e++" into sql")   executeSQL :: Statement -> XSeq -> IO XSeq@@ -57,3 +64,363 @@  prepareSQL :: (IConnection conn) => conn -> String -> IO Statement prepareSQL db sql = handleSqlError (prepare db sql)+++{---------------------------------------------------------------------------------------+-- extract the structural summary of an XML file that contains statistics+----------------------------------------------------------------------------------------}+++-- structural summary: tag   id  max#      hasText children+data SSnode = SSnode String !Int !Int !Int !Bool   [SSnode]+            deriving (Eq,Show)+++insertSS :: String -> [SSnode] -> State Int (Int,SSnode,[SSnode])+insertSS tag ((SSnode n i j l b ts):s)+    | n == tag+    = return (i,SSnode n i j (l+1) b ts,s)+insertSS tag (x:xs)+    = do (i,t,ts) <- insertSS tag xs+         return (i,t,x:ts)+insertSS tag []+    = do count <- get+         put (count+1)+         return (count+1,SSnode tag (count+1) 1 1 False [],[])+++insSS :: String -> [SSnode] -> State Int [SSnode]+insSS tag ns = do (k,t,s) <- insertSS tag ns+                  return (t:s)+++getSS :: [XMLEvent] -> [SSnode] -> State Int [SSnode]+getSS ((EmptyEvent n atts):xs) rs+    = getSS ((StartEvent n atts):(EndEvent n):xs) rs+getSS ((StartEvent n atts):xs) ((SSnode m i j l b ns):rs)+    = do (k,SSnode m' i' j' l' b' ks,ts) <- insertSS n ns+         as <- foldM (\r (a,_) -> insSS ('@':a) r) ks atts+         getSS xs (reset(SSnode m' i' j' l' b' as):(SSnode m i j l b ts):rs)+    where r (SSnode m i j _ b ts) = SSnode m i j 0 b ts+          reset (SSnode m i j l b ts) = SSnode m i j l b (map r ts)+getSS ((EndEvent n):xs) (t:(SSnode m i j l b ns):rs)+    = getSS xs ((SSnode m i j l b (set t:ns):rs))+    where s (SSnode m i j l b ts) = SSnode m i (max j l) 0 b ts+          set (SSnode m i j l b ts) = SSnode m i j l b (map s ts)+getSS ((TextEvent t):xs) ((SSnode m i j l False ns):rs)+    | any (not . isSpace) t+    = getSS xs ((SSnode m i j l True ns):rs)+getSS (_:xs) rs = getSS xs rs+getSS [] rs = return rs+++{---------------------------------------------------------------------------------------+-- Derive a good relational schema based on the structural summary (using hybrid inlining)+----------------------------------------------------------------------------------------}+++type Path = [Tag]+++data Table = Table String Path Bool [Table]+           | Column String Path+           deriving (Show,Read)+++printPath :: Path -> String+printPath [] = ""+printPath [p] = p+printPath (p:ps) = printPath ps++"/"++p+++pathCons p ps = if p=="root" then ps else p:ps+++schema :: SSnode -> String -> [String] -> [Table]+schema (SSnode n i _ (-1) _ ts) prefix path+    = [ Table (prefix++show i) (pathCons n path) True+              ((reverse (concatMap (\t -> schema t prefix []) ts))+               ++[ Column "value" [] ]) ]+schema (SSnode n i j _ _ []) prefix path+    | j == 1 || head n == '@'+    = [ Column (prefix++show i) (pathCons n path) ]+schema (SSnode n i 1 _ _ ts) prefix path+    = concatMap (\t -> schema t prefix (pathCons n path)) ts+schema (SSnode n i _ _ b ts) prefix path+    = [ Table (prefix++show i) (pathCons n path) False+              ((reverse (concatMap (\t -> schema t prefix []) ts))+              ++(if b && all (\(SSnode x _ _ _ _ _)-> head x == '@') ts+                 then [ Column "value" [] ] else [])) ]+++fixSS :: SSnode -> SSnode+fixSS (SSnode n i j l True ts)+    | any (\(SSnode x _ _ _ _ _)-> head x /= '@') ts+    = SSnode n i j (-1) True (filter (\(SSnode x _ _ _ _ _)-> head x == '@') ts)+fixSS (SSnode n i j l b ts)+    = SSnode n i j l b (map fixSS ts)+++deriveSchema :: String -> String -> IO Table+deriveSchema file prefix+    = do doc <- readFile file+         let ts = parseDocument doc+             d = getSS ts [SSnode "root" 1 1 1 False []]+             [SSnode _ _ _ _ _ [t]] = evalState d 1+             nt@(SSnode m i j l b s) = fixSS t+         return (Table prefix [] False (reverse (schema (SSnode m i 2 l b s) prefix [])))+++relationalSchema :: Table -> String -> [String]+relationalSchema (Table n path b ts) parent+    = ("create table "++n++" (      /* "++printPath path+       ++(if b then " (mixed content)" else "")++" */\n"+       ++n++"_id int,\n"+       ++(if parent /= "" then (n++"_parent int references "++parent++"("++parent++"_id),\n") else "")+       ++(concat [ m++" varchar,    /* "++printPath p++" */\n" | Column m p <- ts ])+       ++"primary key ("++n++"_id))\n")+      :[ s | t@(Table _ _ _ _) <- ts, s <- relationalSchema t n ]+++getTableNames :: Table -> [String]+getTableNames (Table n _ _ ts) = n:(concatMap getTableNames ts)+getTableNames _ = []+++initializeDB :: (IConnection conn) => conn -> IO ()+initializeDB db+    = do tables <- getTables db+         if elem "HXQCatalog" tables+            then return ()+            else do let s = "create table HXQCatalog ( name varchar primary key, path varchar, summary varchar )"+                    handleSqlError (run db s [])+                    commit db+++createSchema :: (IConnection conn) => conn -> String -> String -> IO Table+createSchema db file name+    = do initializeDB db+         stmt <- handleSqlError (prepare db "select summary from HXQCatalog where name = ?")+         _ <- handleSqlError (execute stmt  [SqlString name])+         result <- handleSqlError (fetchAllRowsAL stmt)+         if length result > 0+            then do let [[(_,SqlString s)]] = result+                        summary = (read s)::Table+                        tables = getTableNames summary+                    _ <- mapM (\t -> handleSqlError (run db ("drop table if exists "++t) [])) tables+                    _ <- handleSqlError (run db "delete from HXQCatalog where name = ?" [SqlString name])+                    commit db+            else return ()+         t <- deriveSchema file name+         let schema = relationalSchema t ""+         -- mapM putStrLn schema+         _ <- handleSqlError (run db "insert into HXQCatalog values (?,?,?)"+                                      [SqlString name, SqlString file, SqlString (show t)])+         _ <- mapM (\s -> handleSqlError (run db s [])) schema+         commit db+         return t+++findSchema :: (IConnection conn) => conn -> String -> IO Table+findSchema db name+    = do initializeDB db+         stmt <- handleSqlError (prepare db "select summary from HXQCatalog where name = ?")+         _ <- handleSqlError (execute stmt  [SqlString name])+         result <- handleSqlError (fetchAllRowsAL stmt)+         if length result == 1+            then let [[(_,SqlString s)]] = result+                 in return ((read s)::Table)+            else error ("Schema "++name++" doesn't exist")+++{---------------------------------------------------------------------------------------+-- Populate the database from the XML file and its derived structural summary+----------------------------------------------------------------------------------------}+++findPath :: [Table] -> [String] -> Int -> Maybe (Int,Table)+findPath (t@(Table _ p _ s):ts) path _ | p == path = Just ((length s)-1,t)+findPath (t@(Column _ p):ts) path n | p == path = Just (n,t)+findPath ((Table _ _ _ _):ts) path n = findPath ts path n+findPath (_:ts) path n = findPath ts path (n+1)+findPath [] _ _ = Nothing+++populate :: [XMLEvent] -> [Table] -> Int -> [[String]] -> [(Int,String)]+populate ((EmptyEvent tag atts):xs) ts n ps+    = populate ((StartEvent tag atts):(EndEvent tag):xs) ts n ps+populate (x@(StartEvent tag atts):xs) ((t@(Table n path _ s)):ts) _ (p:ps)+    = case findPath s (tag:p) 0 of+        Just (n,nt@(Table m _ True as))+            -> (-1,m):(popAtts atts as ++ showXTree xs 1 "")+               where showXTree ((EmptyEvent tag atts):xs) i s+                         = showXTree xs i (s++"<"++tag++showAL atts++"/>")+                     showXTree ((StartEvent tag atts):xs) i s+                         = showXTree xs (i+1) (s++"<"++tag++showAL atts++">")+                     showXTree ((EndEvent tag):xs) i s+                         = if i==1 then (n,s):(-2,m):(populate xs (t:ts) n (p:ps))+                           else showXTree xs (i-1) (s++"</"++tag++">")+                     showXTree ((TextEvent text):xs) i s = showXTree xs i (s++text)+                     showXTree (_:xs) i s = showXTree xs i s+        Just (n,nt@(Table m _ _ as))+            -> (-1,m):((popAtts atts as)++(populate xs (nt:t:ts) n ([]:p:ps)))+        Just (n,nt)+            -> populate xs (nt:t:ts) n ((tag:p):ps)+        Nothing -> populate xs (t:ts) 0 ((tag:p):ps)+      where popAtts ((a,v):as) ks+                = let Just(m,_) = findPath ks ['@':a] 0+                  in (m,v):(popAtts as ks)+            popAtts [] _ = []+populate ((EndEvent tag):xs) ((t@(Table n path _ s)):ts) _ ([]:ps)+    = (-2,n):populate xs ts 0 ps+populate ((EndEvent tag):xs) ((Column m path):ts) n (p:ps)+    = populate xs ts 0 (tail p:ps)+populate ((EndEvent text):xs) ts _ (p:ps)+    = populate xs ts 0 (tail p:ps)+populate ((TextEvent text):xs) ts n ps+    | any (not . isSpace) text+    = (n,text):populate xs ts n ps+populate (x:xs) ts n ps+    = populate xs ts n ps+populate [] ts n ps = []+++insert :: (IConnection conn) => conn -> [(Int,String)] -> [(String,Int,Statement)] -> IO ()+insert db xs stmts = let (s,_,_,_) = m xs 0 0 in s+    where m ((-1,m):xs) i p = let (s,el,xs',i') = ml xs (i+1) i+                              in (s >> insertTuple m el i p,[],xs',i')+          m ((k,m):xs) i p = (return (),[(k,m)],xs,i)+          ml [] i p = (return (),[],[],i)+          ml ((-2,m):xs) i p = (return (),[],xs,i)+          ml xs i p = let (s,el,xs',i') = m xs i p+                          (s',el',xs'',i'') = ml xs' i' p+                      in (s >> s',el++el',xs'',i'')+          find x xs = foldr (\(a,v) r -> if x==a then v else r) "\NUL" xs+          insertTuple m e i p+              = let (len,stmt) = foldr (\(a,l,s) r -> if m==a then (l,s) else r) (error "") stmts+                    tuple = map (\c -> find c e) [0..len]+                    lift x = if x=="\NUL" then SqlNull else SqlString x+                in do _ <- handleSqlError (execute stmt+                                           (if i==0+                                            then SqlInteger i:(map lift tuple)+                                            else SqlInteger i:SqlInteger p:(map lift tuple)))+                      if mod i 100 == 99 then commit db else return ()+                      return ()+++-- | Store an XML document into the database under the given name.+shred :: (IConnection conn) => conn -> String -> String -> IO ()+shred db file name+    = do let prefix = map toLower name+         let tableStmt (Table n _ _ ts)+                 = do let len = length[ 1 | Column _ _ <- ts]-1+                      stmt <- handleSqlError (prepare db ("insert into "++n++" values ("+                                                          ++(if n==prefix then "" else "?,")++"?"+                                                          ++(concatMap (\_ -> ",?") [0..len])++")"))+                      l <- mapM tableStmt ts+                      return ((n,len,stmt):(concat l))+             tableStmt _ = return []+         t <- createSchema db file prefix+         stmts <- tableStmt t+         doc <- readFile file+         let ts = parseDocument doc+         let ic = (-1,prefix):(populate ts [t] 0 [[]] ++ [(-2,prefix)])+         insert db ic stmts+         commit db+         return ()+++-- | Create a secondary index on tagname for the shredded document under the given name..+createIndex :: (IConnection conn) => conn -> String -> String -> IO ()+createIndex db name tagname+    = do let prefix = map toLower name+         table <- findSchema db name+         let indexes = getIndexes "" table+         _ <- if null indexes+              then error ("there is no tagname: "++tagname)+              else mapM (\(t,c) -> do stmt <- handleSqlError (prepare db ("create index "++t++"_"++c++" on "++t++" ("++c++")"))+                                      handleSqlError (execute stmt [])) indexes+         commit db+         return ()+    where getIndexes _ (Table n _ _ ts) = concatMap (getIndexes n) ts+          getIndexes table (Column n path) | (head path)==tagname = [(table,n)]+          getIndexes _ _ = []+++{----------------------------------------------------------------------------------------------------+--  Convert XQuery to SQL+----------------------------------------------------------------------------------------------------}+++publishES :: [String] -> [String] -> String+publishES (p:ps) xs+    | head p == '@'+    = "attribute "++(tail p)++" {"++publishES ps xs++"}"+publishES (p:ps) xs+    = "<"++p++">{"++publishES ps xs++"}</"++p++">"+publishES [] [x] = x+publishES [] (x:xs) = x++","++publishES [] xs+++publishS :: Table -> String -> String+publishS (Table n path b ts) "error"+    = "for $"++n++" in SQL(select(),from($"++n++"),true()) return "+      ++publishES (reverse path) (map (\t -> publishS t n) ts)+publishS (Table n path b ts) parent+    = "for $"++n++" in SQL(select(),from($"++n++"),$"++n++"/"++n++"_parent eq $"+      ++parent++"/"++parent++"_id) return "+      ++publishES (reverse path) (map (\t -> publishS t n) ts)+publishS (Column n path) parent+    = publishES (reverse path) ["$"++parent++"/"++n++"/text()"]+++publishTable :: Table -> String+publishTable table = "<root>{" ++ publishS table "error" ++ "}</root>"+++sqlFunctions = [("=","="),("eq","="),("<=","<="),(">=",">="),("!=","!="),(">",">"),+                ("<","<"),("ne","!="),("gt",">"),("lt","<"),("ge",">="),("le","<="),+                ("and","and"),("or","or")]++-- Convert a predicate AST to an SQL predicate that uses the tables+toSQL :: [String] -> Ast -> (String,[Ast])+toSQL tables e+    = case e of+        Astring s -> ("\'"++s++"\'",[])+        Aint n -> (show n,[])+        Ast "child_step" [Astring c,Avar v]+            -> if elem v tables+               then (v++"."++c,[])+               else ("?",[e])+        Ast "construction" [_,_,Ast "append" [x]]+            -> toSQL tables x+        Ast "call" [Avar "text",x]+            -> toSQL tables x+        Ast "call" [Avar cmp,x,y]+            | any (\(f,_) -> f==cmp) sqlFunctions+            -> let (nx,vx) = toSQL tables x+                   (ny,vy) = toSQL tables y+               in (nx ++ " " ++ snd (head (filter (\(f,_) -> f==cmp) sqlFunctions)) ++ " " ++ ny,vx++vy)+        _ -> error ("Cannot convert to SQL: "++show e)+++-- Convert an AST to an SQL+makeSQL :: [Ast] -> Ast -> [Ast] -> (String,[Ast])+makeSQL tables pred cols+    = let tnames = [ x | Avar x <- tables ]+          ts = combine tnames+          cs = combine [ x | Avar x <- cols ]+          vars (Ast n args) = concatMap vars args+          vars (Avar v) | not (elem v tnames) = [v]+          vars _ = []+          combine [] = ""+          combine [x] = x+          combine (x:xs) = x++", "++combine xs+      in if pred == Ast "call" [Avar "true"]+         then (if null cs+               then "select * from "++ts+               else "select "++cs++" from "++ts,[])+         else let (p,args) = toSQL tnames pred+              in (if null cs+                  then "select * from "++ts++" where "++p+                  else "select "++cs++" from "++ts++" where "++p,args)
+ XML/HXQ/DBConnect.hs view
@@ -0,0 +1,26 @@+{-------------------------------------------------------------------------------------+-+- HDBC driver. Currently, Sqlite3.+- Programmer: Leonidas Fegaras+- Email: fegaras@cse.uta.edu+- Web: http://lambda.uta.edu/+- Creation: 05/30/08, last update: 05/30/08+- +- Copyright (c) 2008 by Leonidas Fegaras, the University of Texas at Arlington. All rights reserved.+- This material is provided as is, with absolutely no warranty expressed or implied.+- Any use is at your own risk. Permission is hereby granted to use or copy this program+- for any purpose, provided the above notices are retained on all copies.+-+--------------------------------------------------------------------------------------}+++module XML.HXQ.DBConnect where+++import Database.HDBC.Sqlite3++++-- | Connect to the relational database in filepath using the HDBC Sqlite3 driver+connect :: FilePath -> IO Connection+connect filepath = connectSqlite3 filepath
XML/HXQ/Interpreter.hs view
@@ -4,7 +4,7 @@ - Programmer: Leonidas Fegaras - Email: fegaras@cse.uta.edu - Web: http://lambda.uta.edu/-- Creation: 03/22/08, last update: 05/02/08+- Creation: 03/22/08, last update: 05/30/08 -  - Copyright (c) 2008 by Leonidas Fegaras, the University of Texas at Arlington. All rights reserved. - This material is provided as is, with absolutely no warranty expressed or implied.@@ -14,7 +14,7 @@ --------------------------------------------------------------------------------------}  -{-# OPTIONS_GHC -fth #-}+{-# OPTIONS_GHC -fth -fglasgow-exts #-}   module XML.HXQ.Interpreter where@@ -27,19 +27,25 @@ import XML.HXQ.XTree import XML.HXQ.Optimizer import XML.HXQ.Compiler+import Database.HDBC+import XML.HXQ.DB+import XML.HXQ.DBConnect   -- system functions (=, concat, etc) systemFunctions :: [(String,Int,[XSeq]->XSeq)] systemFunctions = $(iFunctions) + -- XPath step functions (child, descendant, etc) pathFunctions :: [(String,Tag->XTree->XSeq)] pathFunctions = $(pFunctions) + -- run-time bindings of FLOWR variables type Environment = [(String,XSeq)] + -- a user-defined function is (fname,parameters,body) type Functions = [(String,[String],Ast)] @@ -49,6 +55,7 @@ undefv3 = error "Undefined last()"  + -- Each XPath predicate must calculate position() and last() from its input XSeq -- if last() is used, then the evaluation is blocking (need to store the whole input XSeq) applyPredicates :: [Ast] -> XSeq -> Bool -> Environment -> Functions -> XSeq@@ -62,16 +69,14 @@     | containsLast pred         -- blocking: use only when last() is used in the predicate     = let last = length xs       in applyPredicates preds-             (foldir (\x i r -> if case eval pred x i last "" env fncs of-                                     [XInt k] -> k == i               -- indexing-                                     b -> conditionTest b-                                then x:r else r) [] xs 1) True env fncs+             (foldir (\x i r -> case eval pred x i last "" env fncs of+                                  [XInt k] -> if k == i then x:r else r               -- indexing+                                  b -> if conditionTest b then x:r else r) [] xs 1) True env fncs applyPredicates (pred:preds) xs _ env fncs     = applyPredicates preds-          (foldir (\x i r -> if case eval pred x i undefv3 "" env fncs of-                                  [XInt k] -> k == i               -- indexing-                                  b -> conditionTest b-                             then x:r else r) [] xs 1) True env fncs+          (foldir (\x i r -> case eval pred x i undefv3 "" env fncs of+                               [XInt k] -> if k == i then x:r else r               -- indexing+                               b -> if conditionTest b then x:r else r) [] xs 1) True env fncs   -- The XQuery interpreter@@ -95,9 +100,9 @@                    [] (eval v context position last effective_axis env fncs)       Ast "call" [Avar "position"] -> [XInt position]       Ast "call" [Avar "last"] -> [XInt last]-      Ast "step" [Ast "child_step" [tag, Avar "."]]+      Ast "child_step" [tag, Avar "."]           |  effective_axis /= ""-          -> eval (Ast "step" [Ast effective_axis [tag, Avar "."]]) context position last "" env fncs+          -> eval (Ast effective_axis [tag, Avar "."]) context position last "" env fncs       Ast "step" ((Ast "descendant_any" (body:tags)):predicates)           -> let ts = map (\(Avar tag) -> tag) tags              in foldr (\x r -> (applyPredicates predicates (descendant_any_with_tagged_children ts x) True env fncs)++r)@@ -106,12 +111,22 @@           |  memV path_step pathFunctions           -> foldr (\x r -> (applyPredicates predicates ((findV path_step pathFunctions) tag x) True env fncs)++r)                    [] (eval body context position last effective_axis env fncs)+      Ast "descendant_any" (body:tags)+          -> let ts = map (\(Avar tag) -> tag) tags+             in foldr (\x r -> (descendant_any_with_tagged_children ts x)++r)+                      [] (eval body context position last effective_axis env fncs)+      Ast path_step [Astring tag,body]+          |  memV path_step pathFunctions+          -> foldr (\x r -> ((findV path_step pathFunctions) tag x)++r)+                   [] (eval body context position last effective_axis env fncs)       Ast "step" [exp]           -> eval exp context position last effective_axis env fncs       Ast "step" (exp:predicates)           -> applyPredicates predicates (eval exp context position last effective_axis env fncs) True env fncs       Ast "predicate" [condition,body]           -> applyPredicates [condition] (eval body context position last effective_axis env fncs) True env fncs+      Ast "append" args+          -> appendText (map (\x -> eval x context position last effective_axis env fncs) args)       Ast "call" ((Avar fname):args)           -> case filter (\(n,_,_) -> n == fname || ("fn:"++n) == fname) systemFunctions of                [(_,len,f)] -> if (length args) == len@@ -130,7 +145,7 @@              -> let alc = map (\(Ast "pair" [a,v])                                      -> let ac = eval a context position last effective_axis env fncs                                             vc = eval v context position last effective_axis env fncs-                                        in (qName ac,showXS (text vc))) al+                                        in (qName ac,showXS vc)) al                     ct = eval tag context position last effective_axis env fncs                     bc = eval body context position last effective_axis env fncs                 in [ XElem (qName ct) alc 0 bc ]@@ -143,7 +158,7 @@       Ast "for" [Avar var,Avar ivar,source,body]     -- a for-loop with an index           -> let p = maxPosition (Avar ivar) body                  ns = if p > 0              -- there is a top-k like restriction-                      then Ast "step" [source,Ast "call" [Avar "<=",Ast "step" [pathPosition],Aint p]]+                      then Ast "step" [source,Ast "call" [Avar "<=",pathPosition,Aint p]]                       else source               in foldir (\a i r -> (eval body a i undefv3 "" ((var,[a]):(ivar,[XInt i]):env) fncs)++r)                        [] (eval ns context position last effective_axis env fncs) 1@@ -209,9 +224,9 @@                       (return []) vs       Ast "call" [Avar "position"] -> return [XInt position]       Ast "call" [Avar "last"] -> return [XInt last]-      Ast "step" [Ast "child_step" [tag, Avar "."]]+      Ast "child_step" [tag, Avar "."]           |  effective_axis /= ""-          -> evalM (Ast "step" [Ast effective_axis [tag, Avar "."]]) context position last "" env fncs+          -> evalM (Ast effective_axis [tag, Avar "."]) context position last "" env fncs       Ast "step" ((Ast "descendant_any" (body:tags)):predicates)           -> do vs <- evalM body context position last effective_axis env fncs                 let ts = map (\(Avar tag) -> tag) tags@@ -222,6 +237,14 @@           -> do vs <- evalM body context position last effective_axis env fncs                 foldr (\x r -> (liftM2 (++)) (applyPredicatesM predicates ((findV path_step pathFunctions) tag x) True env fncs) r)                       (return []) vs+      Ast "descendant_any" (body:tags)+          -> do vs <- evalM body context position last effective_axis env fncs+                let ts = map (\(Avar tag) -> tag) tags+                return (foldr (\x r -> (descendant_any_with_tagged_children ts x)++r) [] vs)+      Ast path_step [Astring tag,body]+          |  memV path_step pathFunctions+          -> do vs <- evalM body context position last effective_axis env fncs+                return (foldr (\x r -> ((findV path_step pathFunctions) tag x)++r) [] vs)       Ast "step" [exp]           -> evalM exp context position last effective_axis env fncs       Ast "step" (exp:predicates)@@ -230,10 +253,16 @@       Ast "predicate" [condition,body]           -> do vs <- evalM body context position last effective_axis env fncs                 applyPredicatesM [condition] vs True env fncs+      Ast "executeSQL" [Avar var,args]+          -> do as <- evalM args context position last effective_axis env fncs+                let [XStmt stmt] = findV var env+                executeSQL stmt as       Ast "call" [Avar nm,c,t,e]     -- this is the only lazy function           | elem nm ["if","fn:if"]           -> do ce <- evalM c context position last effective_axis env fncs                 evalM (if conditionTest ce then t else e) context position last effective_axis env fncs+      Ast "append" args+          -> (liftM appendText) (mapM (\x -> evalM x context position last effective_axis env fncs) args)       Ast "call" ((Avar fname):args)        -- Note: strict function application           -> case filter (\(n,_,_) -> n == fname || ("fn:"++n) == fname) systemFunctions of                [(_,len,f)] -> if (length args) == len@@ -253,7 +282,7 @@              -> do alc <- mapM (\(Ast "pair" [a,v])                                      -> do ac <- evalM a context position last effective_axis env fncs                                            vc <- evalM v context position last effective_axis env fncs-                                           return (qName ac,showXS (text vc))) al+                                           return (qName ac,showXS vc)) al                    ct <- evalM tag context position last effective_axis env fncs                    bc <- evalM body context position last effective_axis env fncs                    return [ XElem (qName ct) alc 0 bc ]@@ -267,7 +296,7 @@       Ast "for" [Avar var,Avar ivar,source,body]     -- a for-loop with an index           -> do let p = maxPosition (Avar ivar) body                     ns = if p > 0              -- there is a top-k like restriction-                            then Ast "step" [source,Ast "call" [Avar "<=",Ast "step" [pathPosition],Aint p]]+                            then Ast "step" [source,Ast "call" [Avar "<=",pathPosition,Aint p]]                             else source                  vs <- evalM ns context position last effective_axis env fncs                 foldir (\a i r -> (liftM2 (++)) (evalM body a i undefv3 "" ((var,[a]):(ivar,[XInt i]):env) fncs) r)@@ -316,8 +345,8 @@                     evalInput eval nvs nfs  -xqueryE :: String -> Environment -> Functions -> IO (XSeq,Environment,Functions)-xqueryE query variables functions+xqueryE :: String -> Environment -> Functions -> (String -> IO XSeq) -> Bool -> IO (XSeq,Environment,Functions)+xqueryE query variables functions dbmapper verbose     = do let asts = parse (scan query)              fncs = foldr (\e r -> case e of                                      Ast "function" ((Avar f):b:args) -> (f,map (\(Avar v) -> v) args,optimize b):r@@ -329,24 +358,52 @@                                             return ((v,uv):s)                                   _ -> r) (return variables) asts          let exprp e = case e of Ast f _ | elem f ["function","variable"] -> True; _ -> False-             (ast,ns) = liftIOSources (concatenateAll (dropWhile exprp asts))+             exps = concatenateAll (dropWhile exprp asts)+             opt_exps = optimize exps+             (ast,ns) = liftIOSources opt_exps+         if verbose+            then do putStrLn "Abstract Syntax Tree (AST):"+                    putStrLn (ppAst exps)+                    putStrLn "Optimized AST:"+                    putStrLn (ppAst opt_exps)+                    putStrLn "Result:"+            else return ()          env <- foldr (\(n,s) r -> case s of+                                     Avar m -> do env <- r+                                                  return ((n,findV m env):env)+                                     Ast "prepareSQL" [Astring sql]+                                         -> do env <- r+                                               t <- dbmapper sql+                                               return ((n,t):env)                                      Astring file -> do doc <- readFile file                                                         env <- r-                                                        return ((n,[materialize (parseDocument doc)]):env)-                                     Avar m -> do env <- r-                                                  return ((n,findV m env):env))+                                                        return ((n,[materialize (parseDocument doc)]):env))                       (return []) ns-         e <- evalM (optimize ast) undefv1 undefv2 undefv3 "" (env++vars) fncs+         e <- evalM ast undefv1 undefv2 undefv3 "" (env++vars) fncs          return (e,vars,fncs)  --- | Evaluate the XQuery using interpreter.+-- | Evaluate the XQuery using the interpreter. xquery :: String -> IO XSeq-xquery query = do (u,_,_) <- xqueryE query [] []; return u+xquery query = do (u,_,_) <- xqueryE query [] [] (\sql -> return []) False+                  return u  --- | Read an XQuery fom a file and run it using the interpreter.+-- | Read an XQuery from a file and run it using the interpreter. xfile :: String -> IO XSeq xfile file = do query <- readFile file                 xquery query+++-- | Evaluate the XQuery with database connectivity using the interpreter.+xqueryDB :: (IConnection conn) => String -> conn -> IO XSeq+xqueryDB query db = do (u,_,_) <- xqueryE query [] []+                                  (\sql -> do stmt <- prepareSQL db sql+                                              return [XStmt stmt]) False+                       return u+++-- | Read an XQuery with database connectivity from a file and run it using the interpreter.+xfileDB :: (IConnection conn) => String -> conn -> IO XSeq+xfileDB file db = do query <- readFile file+                     xqueryDB query db
XML/HXQ/Optimizer.hs view
@@ -4,7 +4,7 @@ - Programmer: Leonidas Fegaras - Email: fegaras@cse.uta.edu - Web: http://lambda.uta.edu/-- Creation: 05/01/08, last update: 05/01/08+- Creation: 05/01/08, last update: 06/10/08 -  - Copyright (c) 2008 by Leonidas Fegaras, the University of Texas at Arlington. All rights reserved. - This material is provided as is, with absolutely no warranty expressed or implied.@@ -16,17 +16,42 @@  module XML.HXQ.Optimizer(optimize) where -import XML.HXQ.Parser(Ast(..))+import System.IO.Unsafe+import Control.Monad+import Char(toLower)+import List(sortBy)+import Database.HDBC+import HXML(AttList)+import XML.HXQ.Parser import XML.HXQ.XTree+import XML.HXQ.DB+import XML.HXQ.DBConnect  -paths = [ "child_step", "descendant_step", "attribute_step", "attribute_descendant_step" ] +paths = [ "current_step", "child_step", "descendant_step", "attribute_step", "attribute_descendant_step" ] + distinct :: Eq a => [a] -> [a] distinct = foldl (\r a -> if elem a r then r else r++[a]) []  +{-# NOINLINE publishXmlDoc #-}+-- get an XML document stored in a relational database+publishXmlDoc :: FilePath -> String -> Ast+publishXmlDoc filepath name+    = let query = unsafePerformIO (publishWrapper filepath name)+          [ast] = parse (scan query)+      in ast+    where publishWrapper filepath name+              = do let prefix = map toLower name+                   db <- connect filepath+                   table <- findSchema db prefix+                   let query = publishTable table+                   disconnect db+                   return query++ -- collect attribute constructions inside element constructions collect_attributes :: Ast -> (Ast,[Ast]) collect_attributes (Ast "attribute_construction" [attr,value])@@ -35,6 +60,9 @@     = let (cx,ax) = collect_attributes x           (cy,ay) = collect_attributes y       in (Ast "call" [Avar "concatenate",cx,cy],ax++ay)+collect_attributes (Ast "append" es)+    = let (s,a) = foldr (\e (r,ar) -> let (cx,ax) = collect_attributes e in (cx:r,ax++ar)) ([],[]) es+      in (Ast "append" s,a) collect_attributes (Ast "step" (e:es))     = let (ce,ae) = collect_attributes e       in (Ast "step" (ce:es),ae)@@ -95,26 +123,30 @@ tagged_children context (Ast "step" ((Ast "child_step" [Astring tag,Ast "step" ((Avar v):_)]):_))     | v == context     = [tag]+tagged_children _ (Ast "step" ((Ast "descendant_any" _):_)) = [] tagged_children _ (Ast "step" ((Ast step _):_))     | elem step paths = [] tagged_children context (Ast _ xs) = concatMap (tagged_children context) xs tagged_children _ _ = []  -optimize :: Ast -> Ast+empty = Ast "call" [Avar "empty"]+++simplify :: Ast -> Ast -- must be done bottom-up:    /../..-optimize (Ast "step" [Ast "parent_step" [Ast "step" [Ast "parent_step" x]]])-    = let nx = optimize (Ast "step" [Ast "parent_step" x])-      in optimize (Ast "step" [Ast "parent_step" [nx]])+simplify (Ast "step" [Ast "parent_step" [Ast "step" [Ast "parent_step" x]]])+    = let nx = simplify (Ast "step" [Ast "parent_step" x])+      in simplify (Ast "step" [Ast "parent_step" [nx]]) -- get rid of a parent step-optimize (Ast "step" [Ast "parent_step" [x]])-    = let (nx,cond,_,_) = removeParent x-      in Ast "predicate" [optimize nx,optimize cond]+simplify (Ast "step" [Ast "parent_step" [x]])+    = let (cond,nx,_,_) = removeParent x+      in Ast "predicate" [simplify cond,simplify nx] -- remove $var/.. in a let-FLWOR-optimize (Ast "let" [Avar var,source,body])+simplify (Ast "let" [Avar var,source,body])     | parentOfVar body var-    = let (nx,cond,childp,tag) = removeParent source-      in optimize (Ast "let" [Avar (var++"_parent"),Ast "predicate" [nx,cond],+    = let (cond,nx,childp,tag) = removeParent source+      in simplify (Ast "let" [Avar (var++"_parent"),Ast "predicate" [cond,nx],                               Ast "let" [Avar var,                                          Ast "step" [ Ast (if childp                                                            then "child_step"@@ -122,10 +154,10 @@                                                       [tag,Avar (var++"_parent")] ],                                          replaceParentOfVar body var (var++"_parent")]]) -- remove $var/.. from a for-FLWOR-optimize (Ast "for" [Avar var,Avar "$",source,body])+simplify (Ast "for" [Avar var,Avar "$",source,body])     | parentOfVar body var-    = let (nx,cond,childp,tag) = removeParent source-      in optimize (Ast "for" [Avar (var++"_parent"),Avar "$",Ast "predicate" [nx,cond],+    = let (cond,nx,childp,tag) = removeParent source+      in simplify (Ast "for" [Avar (var++"_parent"),Avar "$",Ast "predicate" [cond,nx],                               Ast "for" [Avar var,Avar "$",                                          Ast "step" [ Ast (if childp                                                            then "child_step"@@ -133,24 +165,288 @@                                                       [tag,Avar (var++"_parent")] ],                                          replaceParentOfVar body var (var++"_parent")]]) -- pull out attributes from a general element construction-optimize (Ast "element_construction" [tag,content])+simplify (Ast "element_construction" [tag,Ast "attributes" as,content])     = let (nc,attrs) = collect_attributes content-      in optimize (Ast "construction" [tag,Ast "attributes" attrs,nc])+      in simplify (Ast "construction" [tag,Ast "attributes" (as++attrs),nc]) -- if //* collect all children tagnames to use descendant_any_with_tagged_children-optimize (Ast "for" [Avar var,i,Ast "step" [Ast "step" ((Ast "descendant_step" [Astring "*",path]):preds)],body])+simplify (Ast "for" [Avar var,i,Ast "step" [Ast "step" ((Ast "descendant_step" [Astring "*",path]):preds)],body])     | not (null ((tagged_children var body))) || any (not . null . (tagged_children ".")) preds     = let ctags = distinct ((tagged_children var body)++(concatMap (tagged_children ".") preds))           tags = map Avar ctags-      in optimize (Ast "for" [Avar var,i,Ast "step" [Ast "step" ((Ast "descendant_any" (path:tags)):preds)],body])-optimize (Ast "step" ((Ast "child_step" [Astring tag,Ast "step" ((Ast "descendant_step" [Astring "*",path]):preds)]):preds2))+      in simplify (Ast "for" [Avar var,i,Ast "step" [Ast "step" ((Ast "descendant_any" (path:tags)):preds)],body])+simplify (Ast "step" ((Ast "child_step" [Astring tag,Ast "step" ((Ast "descendant_step" [Astring "*",path]):preds)]):preds2))     = let ctags = distinct(tag:(concatMap (tagged_children ".") preds))           tags = map Avar ctags-      in optimize (Ast "step" ((Ast "child_step" [Astring tag,Ast "step" ((Ast "descendant_any" (path:tags)):preds)]):preds2))-optimize (Ast "step" ((Ast "descendant_step" [Astring "*",path]):preds))+      in simplify (Ast "step" ((Ast "child_step" [Astring tag,Ast "step" ((Ast "descendant_any" (path:tags)):preds)]):preds2))+simplify (Ast "step" ((Ast "descendant_step" [Astring "*",path]):preds))     | any (not . null . (tagged_children ".")) preds     = let ctags = distinct (concatMap (tagged_children ".") preds)           tags = map Avar ctags-      in optimize (Ast "step" ((Ast "descendant_any" (path:tags)):preds))--- needs more rules-optimize (Ast n args) = Ast n (map optimize args)-optimize e = e+      in simplify (Ast "step" ((Ast "descendant_any" (path:tags)):preds))+-- expand the wrapper of a stored document+simplify (Ast "call" [Avar "publish",Astring dbpath,Astring name])+    = simplify (publishXmlDoc dbpath name)+-- default+simplify (Ast n args) = Ast n (map simplify args)+simplify e = e+++taggedElement :: [Ast] -> String -> Maybe [Ast]+taggedElement (e@(Ast "construction" [Astring ctag,_,x]):xs) tag+    | ctag == tag || tag == "*"+    = case taggedElement xs tag of+        Nothing -> Nothing+        Just s -> Just (e:s)+taggedElement ((Ast "construction" [_,_,_]):xs) tag+    = taggedElement xs tag+taggedElement ((Ast "call" [Avar "concatenate",x,y]):xs) tag+    = case (taggedElement (x:xs) tag,taggedElement (y:xs) tag) of+        (Just tx,Just ty) -> Just (tx++ty)+        _ -> Nothing+taggedElement ((Astring _):xs) tag+    = taggedElement xs tag+taggedElement ((Aint _):xs) tag+    = taggedElement xs tag+taggedElement (e:xs) tag = Nothing+taggedElement [] _ = Just []+++findAttr :: String -> [Ast] -> Ast+findAttr tag ((Ast "pair" [Astring a,v]):_) | a==tag || tag=="*" = v+findAttr tag (_:xs) = findAttr tag xs+findAttr _ [] = empty+++andAll :: [Ast] -> Ast+andAll [x] = x+andAll (x:xs) = foldl (\a r -> call "and" [a,r]) x xs+++substContext :: Ast -> Ast -> Maybe Ast+substContext context e+    = case e of+        Ast "call" ((Avar f):xs)+            -> do ys <- mapM (substContext context) xs+                  return (Ast "call" ((Avar f):ys))+        Ast "descendant_any" (x:tags)+            -> do nx <- substContext context x+                  return (Ast "descendant_any" (nx:tags))+        Ast step [tag,x]+            | elem step paths+            -> do nx <- substContext context x+                  return (Ast step [tag,nx])+        Avar "." -> Just context+        Astring _ -> Just e+        Aint _ -> Just e+        Afloat _ -> Just e+        Avar _ -> Just e+        _ -> Nothing+++occurs :: String -> Ast -> Int+occurs v e+    = case e of+        Avar w | v==w -> 1+        Ast "let" [Avar w,_,_] | v==w -> 0+        Ast "for" [Avar w,Avar i,_,_] | v==w || v==i -> 0+        Ast n xs -> sum (map (occurs v) xs)+        _ -> 0+++subst :: String -> Ast -> Ast -> Ast+subst v e b+    = case b of+        Avar w | v==w -> e+        Ast "let" [Avar w,_,_] | v==w -> b+        Ast "for" [Avar w,Avar i,_,_] | v==w || v==i -> b+        Ast n xs -> Ast n (map (subst v e) xs)+        _ -> b+++sqlPredicate :: Ast -> Bool+sqlPredicate e+    = case e of+        Astring s -> True+        Aint n -> True+        Ast "child_step" [Astring c,Avar v] -> True+        Ast "construction" [_,_,Ast "append" [x]]+            -> sqlPredicate x+        Ast "call" [Avar "text",x]+            -> sqlPredicate x+        Ast "call" [Avar cmp,x,y]+            | any (\(f,_) -> f==cmp) sqlFunctions+            -> (sqlPredicate x) && (sqlPredicate y)+        _ -> False+++usesCurrentContext :: Ast -> Bool+usesCurrentContext (Ast _ xs) = any usesCurrentContext xs+usesCurrentContext (Avar ".") = True+usesCurrentContext _ = False+++-- Normalization+normalize :: Ast -> Bool -> (Ast,Bool)+normalize exp changed+    = case exp of+        Ast "step" [x]+            -> normalize x True+        Ast "step" (x:(Ast "call" [Avar "true"]):xs)+            -> normalize (Ast "step" (x:xs)) True+        Ast "step" (x:(Ast "call" [Avar "false"]):xs)+            -> (empty,True)+        Ast "for" [v,i,Ast "call" [Avar "empty"],b]+            -> (empty,True)+        Ast "for" [v,i,s,Ast "call" [Avar "empty"]]+            -> (empty,True)+        Ast "descendant_any" ((Astring _):_)+            -> (empty,True)+        Ast "descendant_any" ((Aint _):_)+            -> (empty,True)+        Ast "descendant_any" ((Afloat _):_)+            -> (empty,True)+        Ast "descendant_any" ((Ast "call" [Avar "text",_]):_)+            -> (empty,True)+        Ast "descendant_any" ((Ast "call" [Avar "empty"]):_)+            -> (empty,True)+        Ast step [_,Astring _]+            | elem step paths+            -> (empty,True)+        Ast step [_,Aint _]+            | elem step paths+            -> (empty,True)+        Ast step [_,Afloat _]+            | elem step paths+            -> (empty,True)+        Ast step [_,Ast "call" [Avar "text",_]]+            | elem step paths+            -> (empty,True)+        Ast step [_,Ast "call" [Avar "empty"]]+            | elem step paths+            -> (empty,True)+        Ast "call" [Avar "and",Ast "call" [Avar "true"],x]+            -> normalize x True+        Ast "call" [Avar "and",x,Ast "call" [Avar "true"]]+            -> normalize x True+        -- (x,())  ->  x+        Ast "call" [Avar "concatenate",x,Ast "call" [Avar "empty"]]+            -> normalize x True+        -- ((),x)  ->  x+        Ast "call" [Avar "concatenate",Ast "call" [Avar "empty"],x]+            -> normalize x True+        -- for $v1 in (for $v2 in s2 return b2) return b1  -->  for $v2 in s2, for $v1 in b2 return b1+        Ast "for" [v1,i1,Ast "for" [v2,i2,s2,b2],b1]+            -> normalize (Ast "for" [v2,i2,s2,Ast "for" [v1,i1,b2,b1]]) True+        -- (for $v in s return b)/tag  -->  for $v in s return b/tag  -->  +        Ast "descendant_any" ((Ast "for" [v,i,s,b]):tags)+            -> normalize (Ast "for" [v,i,s,Ast "descendant_any" (b:tags)]) True+        Ast step [tag,Ast "for" [v,i,s,b]]+            | elem step paths+            -> normalize (Ast "for" [v,i,s,Ast step [tag,b]]) True+        -- (x,y)/tag  -->  (x/tag,y/tag)+        Ast "descendant_any" ((Ast "call" [Avar "concatenate",x,y]):tags)+            -> normalize (Ast "call" [Avar "concatenate",Ast "descendant_any" (x:tags),Ast "descendant_any" (y:tags)]) True+        Ast step [tag,Ast "call" [Avar "concatenate",x,y]]+            | elem step paths+            -> normalize (Ast "call" [Avar "concatenate",Ast step [tag,x],Ast step [tag,y]]) True+        -- for $v in (x,y) return b  -->  (for $v in x return b,for $v in y return b)+        Ast "for" [v,i,Ast "call" [Avar "concatenate",x,y],b]+            -> normalize (Ast "call" [Avar "concatenate",Ast "for" [v,i,x,b],Ast "for" [v,i,y,b]]) True+        Ast "for" [Avar v,Avar i,e,b]+            | case e of Ast "construction" _ -> True; Ast _ _ -> False; _ -> True+            -> normalize (if i == "$"+                          then subst v e b+                          else subst v e (subst i (Aint 1) b)) True+        -- unfold linear let+        Ast "let" [Avar v,e,b]+            | occurs v b < 2+            -> normalize (subst v e b) True+        -- (if c then t else e)/A  -->  if c then t/A else e/A+        Ast "descendant_any" ((Ast "predicate" [c,e]):tags)+            | not (usesCurrentContext c)+            -> normalize (Ast "predicate" [c,Ast "descendant_any" (e:tags)]) True+        Ast step [tag,Ast "predicate" [c,e]]+            | elem step paths && not (usesCurrentContext c)+            -> normalize (Ast "predicate" [c,Ast step [tag,e]]) True+        -- normalize predicate+        Ast "predicate" [Ast "call"[Avar "true"],x]+            -> (empty,True)+        Ast "predicate" [x,Ast "call"[Avar "empty"]]+            -> (empty,True)+        Ast "step" ((Ast "call" [Avar "empty"]):xs)+            -> (empty,True)+        Ast "step" ((Ast "call" [Avar "concatenate",x,y]):xs)+            -> normalize (Ast "call" [Avar "concatenate",Ast "step" (x:xs),Ast "step" (y:xs)]) True+        Ast "step" ((Ast "for" [v,i,s,b]):xs)+            -> normalize (Ast "for" [v,i,s,Ast "step" (b:xs)]) True+        Ast "step" (e@(Ast "construction" [_,_,_]):xs)+            -> case mapM (substContext e) xs of+                 Just es -> normalize (Ast "predicate" [andAll es,e]) True+                 Nothing -> let (r,b) = foldr (\a (r,b) -> let (c,s) = normalize a b in (c:r,s))+                                              ([],changed) (e:xs)+                            in (Ast "step" r,b)+        Ast "call" [Avar "=",x,y]+            | x == empty || y == empty+            -> (Ast "call"[Avar "true"],True)+        -- (<ctag>...<tag>...</tag>...</ctag>)/tag  -->  ...<tag>...</tag>...+        Ast "child_step" [Astring tag,Ast "construction" [_,_,Ast "append" x]]+            | taggedElement x tag /= Nothing+            -> case taggedElement x tag of+                 Just [] -> (empty,True)+                 Just s -> normalize (concatenateAll s) True+        Ast "child_step" [Astring tag,Ast "construction" [_,_,Ast "append" x]]+            -> normalize (Ast "current_step" [Astring tag,concatenateAll x]) True+        Ast "current_step" [Astring tag1,e@(Ast "construction" [Astring tag2,_,Ast "append" x])]+            -> if tag1 == tag2 || tag1 == "*"+               then normalize e True+               else (empty,True)+        -- (<tag>x</tag>)//tag  --> (x,x//tag)+        Ast "descendant_any" (z@(Ast "construction" [Astring ctag,_,Ast "append" x]):tags)+            -> normalize (Ast "call" [Avar "concatenate",z,Ast "descendant_any" ((concatenateAll x):tags)]) True+        Ast "descendant_step" [Astring tag,z@(Ast "construction" [Astring ctag,_,Ast "append" x])]+            -> normalize (if tag == ctag || tag == "*"+                          then Ast "call" [Avar "concatenate",z,Ast "descendant_step" [Astring tag,concatenateAll x]]+                          else Ast "descendant_step" [Astring tag,concatenateAll x]) True+        -- (<tag A=s>x</tag>)/@A  --> s+        Ast "attribute_step" [Astring tag,Ast "construction" [ctag,Ast "attributes" as,x]]+            -> (findAttr tag as,True)+        -- (<tag A=s>x</tag>)//@A  --> (s,x//@A)+        Ast "attribute_descendant_step" [Astring tag,Ast "construction" [ctag,Ast "attributes" as,Ast "append" x]]+            -> normalize (Ast "call" [Avar "concatenate",findAttr tag as,+                                      Ast "attribute_descendant_step" [Astring tag,concatenateAll x]]) True+        -- SQL folding+        Ast "for" [Avar v1,Avar "$",Ast "call" [Avar "SQL",Ast "call" ((Avar "select"):s1),Ast "call" ((Avar "from"):f1),pred1],+                   Ast "for" [Avar v2,Avar "$",Ast "call" [Avar "SQL",Ast "call" ((Avar "select"):s2),Ast "call" ((Avar "from"):f2),pred2],b]]+            -> normalize (Ast "for" [Avar v2,Avar "$",Ast "call" [Avar "SQL",Ast "call" ((Avar "select"):(s1++s2)),+                                                                  Ast "call" ((Avar "from"):(f1++f2)),Ast "call" [Avar "and",pred1,pred2]],b])+                         True+        Ast "for" [Avar v,Avar "$",Ast "call" [Avar "SQL",Ast "call" ((Avar "select"):s),Ast "call" ((Avar "from"):f),pred1],+                   Ast "predicate" [pred2,x]]+            | sqlPredicate pred2+            -> normalize (Ast "for" [Avar v,Avar "$",Ast "call" [Avar "SQL",Ast "call" ((Avar "select"):s),+                                                                 Ast "call" ((Avar "from"):f),Ast "call" [Avar "and",pred1,pred2]],x]) True+        -- default+        Ast n args+            -> let (r,b) = foldr (\a (r,b) -> let (c,s) = normalize a b in (c:r,s)) ([],changed) args+               in (Ast n r,b)+        _ -> (exp,changed)+++foldSQL :: Ast -> Ast+foldSQL e+    = case e of+        Ast "call" [Avar "SQL",Ast "call" ((Avar "select"):cols),Ast "call" ((Avar "from"):tables),pred]+            -> let (sql,args) = makeSQL tables pred cols+               in Ast "call" [Avar "sql",Astring sql,concatenateAll args]+        Ast n args -> Ast n (map foldSQL args)+        _ -> e+++optimizeLoop :: Ast -> Ast+optimizeLoop e = let (ne,b) = normalize e False+                 in if b+                    then optimizeLoop ne+                    else ne++optimize :: Ast -> Ast+optimize e = foldSQL (optimizeLoop (simplify e))
XML/HXQ/Parser.hs view
@@ -122,48 +122,60 @@ happyOut20 :: (HappyAbsSyn ) -> ([ Ast ]) happyOut20 x = unsafeCoerce# x {-# INLINE happyOut20 #-}-happyIn21 :: ([ Ast ]) -> (HappyAbsSyn )+happyIn21 :: (Ast) -> (HappyAbsSyn ) happyIn21 x = unsafeCoerce# x {-# INLINE happyIn21 #-}-happyOut21 :: (HappyAbsSyn ) -> ([ Ast ])+happyOut21 :: (HappyAbsSyn ) -> (Ast) happyOut21 x = unsafeCoerce# x {-# INLINE happyOut21 #-}-happyIn22 :: (Ast) -> (HappyAbsSyn )+happyIn22 :: ([Ast]) -> (HappyAbsSyn ) happyIn22 x = unsafeCoerce# x {-# INLINE happyIn22 #-}-happyOut22 :: (HappyAbsSyn ) -> (Ast)+happyOut22 :: (HappyAbsSyn ) -> ([Ast]) happyOut22 x = unsafeCoerce# x {-# INLINE happyOut22 #-}-happyIn23 :: (Ast -> Ast) -> (HappyAbsSyn )+happyIn23 :: ([ Ast ]) -> (HappyAbsSyn ) happyIn23 x = unsafeCoerce# x {-# INLINE happyIn23 #-}-happyOut23 :: (HappyAbsSyn ) -> (Ast -> Ast)+happyOut23 :: (HappyAbsSyn ) -> ([ Ast ]) happyOut23 x = unsafeCoerce# x {-# INLINE happyOut23 #-}-happyIn24 :: (Ast -> Ast) -> (HappyAbsSyn )+happyIn24 :: (Ast) -> (HappyAbsSyn ) happyIn24 x = unsafeCoerce# x {-# INLINE happyIn24 #-}-happyOut24 :: (HappyAbsSyn ) -> (Ast -> Ast)+happyOut24 :: (HappyAbsSyn ) -> (Ast) happyOut24 x = unsafeCoerce# x {-# INLINE happyOut24 #-}-happyIn25 :: (String -> Ast -> [ Ast ]) -> (HappyAbsSyn )+happyIn25 :: (Ast -> Ast) -> (HappyAbsSyn ) happyIn25 x = unsafeCoerce# x {-# INLINE happyIn25 #-}-happyOut25 :: (HappyAbsSyn ) -> (String -> Ast -> [ Ast ])+happyOut25 :: (HappyAbsSyn ) -> (Ast -> Ast) happyOut25 x = unsafeCoerce# x {-# INLINE happyOut25 #-}-happyIn26 :: (String -> Ast -> Ast) -> (HappyAbsSyn )+happyIn26 :: (Ast -> Ast) -> (HappyAbsSyn ) happyIn26 x = unsafeCoerce# x {-# INLINE happyIn26 #-}-happyOut26 :: (HappyAbsSyn ) -> (String -> Ast -> Ast)+happyOut26 :: (HappyAbsSyn ) -> (Ast -> Ast) happyOut26 x = unsafeCoerce# x {-# INLINE happyOut26 #-}-happyIn27 :: (String -> Ast -> Ast) -> (HappyAbsSyn )+happyIn27 :: (String -> Ast -> [ Ast ]) -> (HappyAbsSyn ) happyIn27 x = unsafeCoerce# x {-# INLINE happyIn27 #-}-happyOut27 :: (HappyAbsSyn ) -> (String -> Ast -> Ast)+happyOut27 :: (HappyAbsSyn ) -> (String -> Ast -> [ Ast ]) happyOut27 x = unsafeCoerce# x {-# INLINE happyOut27 #-}+happyIn28 :: (String -> Ast -> Ast) -> (HappyAbsSyn )+happyIn28 x = unsafeCoerce# x+{-# INLINE happyIn28 #-}+happyOut28 :: (HappyAbsSyn ) -> (String -> Ast -> Ast)+happyOut28 x = unsafeCoerce# x+{-# INLINE happyOut28 #-}+happyIn29 :: (String -> Ast -> Ast) -> (HappyAbsSyn )+happyIn29 x = unsafeCoerce# x+{-# INLINE happyIn29 #-}+happyOut29 :: (HappyAbsSyn ) -> (String -> Ast -> Ast)+happyOut29 x = unsafeCoerce# x+{-# INLINE happyOut29 #-} happyInTok :: Token -> (HappyAbsSyn ) happyInTok x = unsafeCoerce# x {-# INLINE happyInTok #-}@@ -173,21 +185,21 @@   happyActOffsets :: HappyAddr-happyActOffsets = HappyA# "\xbe\x00\xbe\x00\x00\x00\x00\x00\x74\x02\x70\x00\x00\x00\x00\x00\xeb\xff\x00\x00\xfd\xff\x00\x00\x00\x00\x69\x01\x69\x01\xfa\x00\x82\x00\xfa\x00\xfa\x00\x00\x00\x70\x01\xfa\x00\x67\x01\x67\x01\x1c\x00\x16\x00\x37\x00\x84\x01\x76\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xd1\xff\x47\x01\x00\x00\x3b\x00\x4f\x01\x46\x01\xff\xff\xfd\xff\x4d\x01\xfa\x00\x7d\x01\x4b\x01\xfa\x00\x7b\x01\x0c\x01\x11\x01\xe0\xff\x0f\x01\x00\x00\xf9\x00\x00\x00\x00\x00\x74\x02\x29\x00\x00\x00\x5a\x01\xf4\xff\xef\xff\x2b\x01\x00\x00\xfa\x00\x4d\x00\x24\x00\x00\x00\x02\x01\xed\x00\xed\x00\xfa\x00\xfa\x00\xfa\x00\xfa\x00\xfa\x00\xfa\x00\xfa\x00\xfa\x00\xfa\x00\xfa\x00\xfa\x00\xfa\x00\xfa\x00\xfa\x00\xfa\x00\xfa\x00\xfa\x00\xfa\x00\xfa\x00\xfa\x00\xfa\x00\xfa\x00\xfa\x00\xfa\x00\xfa\x00\xfa\x00\xfa\x00\xfa\x00\xfa\x00\x90\x02\x90\x02\x90\x02\xc2\x02\x90\x02\xa9\x02\x50\x01\x50\x01\x50\x01\x50\x01\x50\x01\x50\x01\x50\x01\x50\x01\x50\x01\x50\x01\x50\x01\x50\x01\x50\x01\x50\x01\x50\x01\x00\x00\x00\x00\x00\x00\x00\x00\x25\x01\x25\x01\xda\x02\x74\x02\x04\x01\x00\x01\x2c\x01\xee\x00\x00\x00\x19\x00\xfa\x00\x0e\x00\xfb\xff\xe2\x00\x00\x00\x00\x00\x16\x01\x37\x00\x5b\x00\x00\x00\xa2\x01\x00\x00\xd5\x00\xfa\x00\xfa\x00\xfa\x00\x00\x00\xfa\x00\xdb\x00\xfe\x00\xfa\x00\xd2\x00\xd2\x00\xfa\x00\xfa\x00\x1e\x02\x05\x01\xfa\x00\xff\x01\x03\x01\xc6\x00\x08\x00\x00\x00\xd0\x00\xf0\x00\xb2\x00\x00\x00\x04\x00\xfa\x00\x00\x00\x00\x00\xeb\x00\x5f\x00\x00\x00\xe7\x00\x5c\x00\x74\x02\xc2\x00\xb7\x00\x74\x02\x09\x00\xcc\x00\x74\x02\x7f\x01\x74\x02\x74\x02\xde\xff\x00\x00\xda\x00\x37\x00\xda\x00\xc3\x00\x50\x00\x00\x00\xfa\x00\x9f\x00\x00\x00\x00\x00\xfa\x00\xfa\x00\x74\x02\x34\x01\xaa\x00\xc0\x00\x26\x00\x00\x00\x00\x00\xca\x00\xfa\x00\x8f\x00\xfa\x00\xfa\xff\xfa\x00\x00\x00\xfa\x00\xfa\x00\x00\x00\xfa\x00\x00\x00\xfa\x00\x74\x02\x02\x00\x00\x00\xba\x00\xfa\x00\xb8\x00\x7b\x00\x0c\x00\xfe\xff\x74\x02\x74\x02\x58\x02\xfa\x00\x00\x00\x74\x02\x90\x00\x74\x02\x00\x00\x00\x00\xfa\x00\x00\x00\x00\x00\x00\x00\x34\x01\xfa\x00\x3b\x02\x00\x00\x00\x00\x00\x00\x00\x00\xfa\x00\xe0\x01\x00\x00\xc1\x01\x00\x00\x74\x02\x00\x00\x00\x00\x00\x00"#+happyActOffsets = HappyA# "\xce\x00\xce\x00\x00\x00\x00\x00\x47\x02\x9c\x00\x00\x00\x00\x00\x40\x00\x00\x00\x06\x00\x00\x00\xfd\xff\x00\x00\x00\x00\x7e\x01\x7e\x01\x13\x01\x89\x00\x13\x01\x13\x01\x13\x01\x00\x00\x68\x01\x13\x01\x5f\x01\x5f\x01\x1c\x00\x17\x00\x63\x00\x97\x01\xa9\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xd8\xff\x5c\x01\x00\x00\x44\x00\x64\x01\x5b\x01\xff\xff\xfd\xff\x43\x01\x13\x01\x71\x01\x41\x01\x13\x01\x6f\x01\x4c\x01\x4b\x01\xec\xff\x2a\x01\x00\x00\x3c\x01\x00\x00\x00\x00\x47\x02\x64\x00\x10\x00\x00\x00\x73\x01\x3a\x00\x38\x00\x1b\x01\x00\x00\x13\x01\x28\x00\x13\x01\x00\x00\x16\x00\x00\x00\x23\x01\x0f\x01\x0f\x01\x13\x01\x13\x01\x13\x01\x13\x01\x13\x01\x13\x01\x13\x01\x13\x01\x13\x01\x13\x01\x13\x01\x13\x01\x13\x01\x13\x01\x13\x01\x13\x01\x13\x01\x13\x01\x13\x01\x13\x01\x13\x01\x13\x01\x13\x01\x13\x01\x13\x01\x13\x01\x13\x01\x13\x01\x13\x01\x63\x02\x63\x02\x63\x02\x95\x02\x63\x02\x7c\x02\x1c\x01\x1c\x01\x1c\x01\x1c\x01\x1c\x01\x1c\x01\x1c\x01\x1c\x01\x1c\x01\x1c\x01\x1c\x01\x1c\x01\x1c\x01\x1c\x01\x1c\x01\x00\x00\x00\x00\x00\x00\x00\x00\x08\x01\x08\x01\x56\x08\x47\x02\x24\x01\x22\x01\x4e\x01\x14\x01\x00\x00\xfa\xff\x13\x01\x01\x00\xfb\xff\x12\x01\x00\x00\x00\x00\x59\x00\x3a\x01\x63\x00\x62\x00\x00\x00\xb7\x01\x00\x00\xf9\x00\x13\x01\x13\x01\x13\x01\x00\x00\x13\x01\x00\x00\x00\x01\x25\x01\x13\x01\xf4\x00\xf4\x00\x13\x01\x13\x01\x2b\x02\x29\x01\x13\x01\x0e\x02\x27\x01\xef\x00\x0e\x00\x00\x00\x03\x01\x1e\x01\xe3\x00\x00\x00\x0c\x00\x13\x01\x00\x00\x00\x00\x1a\x01\x57\x00\x00\x00\x19\x01\x51\x00\x47\x02\xf0\x00\xe6\x00\x47\x02\xfc\xff\xfb\x00\x47\x02\x96\x01\x47\x02\x47\x02\xe8\xff\x00\x00\xf8\x00\x63\x00\xf8\x00\x00\x00\xf5\x00\x4f\x00\x00\x00\x13\x01\xc2\x00\x00\x00\x00\x00\x13\x01\x13\x01\x47\x02\x4d\x01\xdb\x00\xd9\x00\x49\x00\x00\x00\x00\x00\xe7\x00\x13\x01\xa1\x00\x13\x01\xfc\xff\x00\x00\x13\x01\x13\x01\x00\x00\x13\x01\x00\x00\x13\x01\x47\x02\x08\x00\x00\x00\xcf\x00\x13\x01\xca\x00\x85\x00\x24\x00\x12\x00\x47\x02\x47\x02\x00\x00\x47\x02\x97\x00\x47\x02\x00\x00\x00\x00\x13\x01\x00\x00\x00\x00\x00\x00\x4d\x01\x13\x01\x00\x00\x00\x00\x00\x00\x13\x01\xf1\x01\x00\x00\xd4\x01\x47\x02\x00\x00\x00\x00\x00\x00"#  happyGotoOffsets :: HappyAddr-happyGotoOffsets = HappyA# "\xa4\x00\x0d\x01\x00\x00\x00\x00\x00\x00\x9d\x00\x00\x00\x00\x00\x00\x00\x00\x00\x9c\x00\x00\x00\x00\x00\x9b\x00\x79\x00\x5a\x06\x9c\x03\x4d\x06\x40\x06\x00\x00\x00\x00\x33\x06\x73\x00\x67\x00\x00\x00\x00\x00\x15\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xd1\x00\x00\x00\xa0\x00\x87\x03\x98\x00\x00\x00\x26\x06\x00\x00\x00\x00\x19\x06\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x85\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x8d\x00\x00\x00\x0c\x06\x12\x01\xbd\x00\x00\x00\x86\x00\x6b\x00\x5d\x00\xff\x05\xf2\x05\xe5\x05\xd8\x05\xcb\x05\xbe\x05\xb1\x05\xa4\x05\x97\x05\x8a\x05\x7d\x05\x70\x05\x63\x05\x56\x05\x49\x05\x3c\x05\x2f\x05\x22\x05\x15\x05\x08\x05\xfb\x04\xee\x04\xe1\x04\xd4\x04\xc7\x04\xba\x04\xad\x04\xa0\x04\x93\x04\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x0d\x00\x72\x03\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xf2\x00\xd9\x00\x00\x00\x00\x00\x00\x00\x71\x00\x86\x04\x79\x04\x6c\x04\x00\x00\x5f\x04\x00\x00\x00\x00\x52\x04\x60\x00\x5a\x00\x45\x04\x5d\x03\x00\x00\x00\x00\x48\x03\x00\x00\x00\x00\x41\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x96\x00\x38\x04\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xd6\x00\x00\x00\x00\x00\x00\x00\x00\x00\x33\x03\x00\x00\x00\x00\x00\x00\x1e\x03\x2b\x04\x00\x00\x1d\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x1e\x04\x2b\x00\x11\x04\x00\x00\x04\x04\x00\x00\xf7\x03\xea\x03\x00\x00\x11\x03\x00\x00\xfc\x02\x00\x00\x00\x00\x00\x00\x00\x00\xdd\x03\x00\x00\x12\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xd0\x03\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xc3\x03\x00\x00\x00\x00\x00\x00\x07\x00\xb6\x03\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xa9\x03\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"#+happyGotoOffsets = HappyA# "\xa7\x00\x31\x01\x00\x00\x00\x00\x00\x00\xb1\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x0a\x01\x00\x00\x00\x00\xd8\x00\xd1\x00\x4a\x08\x9e\x03\x87\x03\x33\x08\x1c\x08\x00\x00\x00\x00\x05\x08\xc1\x00\x7f\x00\x00\x00\x00\x00\xf3\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xec\x00\x00\x00\xb4\x00\x70\x03\xdf\x00\x00\x00\xee\x07\x00\x00\x00\x00\xd7\x07\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x99\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x90\x00\x00\x00\xc0\x07\xd3\x00\x59\x03\x00\x00\x0d\x00\x00\x00\x9f\x00\x8e\x00\x71\x00\xa9\x07\x92\x07\x7b\x07\x64\x07\x4d\x07\x36\x07\x1f\x07\x08\x07\xf1\x06\xda\x06\xc3\x06\xac\x06\x95\x06\x7e\x06\x67\x06\x50\x06\x39\x06\x22\x06\x0b\x06\xf4\x05\xdd\x05\xc6\x05\xaf\x05\x98\x05\x81\x05\x6a\x05\x53\x05\x3c\x05\x25\x05\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x92\x00\x42\x03\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xd0\x00\xc9\x00\x00\x00\x00\x00\x00\x00\x9b\x00\x0e\x05\xf7\x04\xe0\x04\x00\x00\xc9\x04\x00\x00\x00\x00\x00\x00\xb2\x04\x93\x00\x77\x00\x9b\x04\x2b\x03\x00\x00\x00\x00\x14\x03\x00\x00\x00\x00\xf5\xff\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x8c\x00\x84\x04\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x6f\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x98\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xfd\x02\x00\x00\x00\x00\x00\x00\xe6\x02\x6d\x04\x00\x00\x4b\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x56\x04\x20\x00\x3f\x04\x4d\x00\x00\x00\x28\x04\x11\x04\x00\x00\xcf\x02\x00\x00\xb8\x02\x00\x00\x00\x00\x00\x00\x00\x00\xfa\x03\x00\x00\x11\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xe3\x03\x00\x00\x00\x00\x00\x00\x1f\x00\xcc\x03\x00\x00\x00\x00\x00\x00\xb5\x03\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"#  happyDefActions :: HappyAddr-happyDefActions = HappyA# "\x00\x00\x00\x00\x00\x00\x8e\xff\xfa\xff\xbd\xff\xed\xff\xee\xff\x00\x00\xef\xff\x9e\xff\x93\xff\x91\xff\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x90\xff\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x8f\xff\x00\x00\x8d\xff\xf4\xff\xcc\xff\xcb\xff\xcd\xff\x00\x00\xfe\xff\xfd\xff\x00\x00\x00\x00\x00\x00\x00\x00\x9d\xff\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xc7\xff\x00\x00\xc8\xff\xce\xff\xac\xff\xcf\xff\xd0\xff\xca\xff\x00\x00\x8b\xff\x00\x00\x00\x00\x00\x00\x9c\xff\x9a\xff\x00\x00\x00\x00\x00\x00\xb1\xff\xbb\xff\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xd1\xff\xd2\xff\xd3\xff\xd4\xff\xd5\xff\xd6\xff\xd7\xff\xd8\xff\xd9\xff\xda\xff\xdb\xff\xdc\xff\xdd\xff\xde\xff\xdf\xff\xe0\xff\xe1\xff\xe2\xff\xe3\xff\xe4\xff\xe5\xff\xe6\xff\xe7\xff\xe8\xff\xe9\xff\xea\xff\xeb\xff\xec\xff\xbe\xff\xc5\xff\xc6\xff\x00\x00\x00\x00\xa7\xff\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xa8\xff\xa9\xff\x98\xff\x00\x00\x00\x00\x94\xff\x00\x00\x99\xff\x00\x00\x00\x00\x00\x00\x00\x00\x8c\xff\x00\x00\xab\xff\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x9b\xff\x00\x00\x89\xff\x00\x00\x00\x00\xfc\xff\xfb\xff\x00\x00\x00\x00\x8a\xff\xb4\xff\x00\x00\x00\x00\xb5\xff\x00\x00\x00\x00\xc0\xff\x00\x00\x00\x00\xc4\xff\x00\x00\x00\x00\xc9\xff\x00\x00\xf1\xff\xf2\xff\x00\x00\x92\xff\x96\xff\x00\x00\x97\xff\x00\x00\x00\x00\xa3\xff\x00\x00\x00\x00\xa4\xff\xa5\xff\x00\x00\x00\x00\xf3\xff\xb6\xff\xbc\xff\x00\x00\x00\x00\xaa\xff\xb2\xff\x95\xff\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xa2\xff\x00\x00\x00\x00\xae\xff\x00\x00\xad\xff\x00\x00\xf9\xff\x00\x00\xf6\xff\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xbf\xff\xc3\xff\x00\x00\x00\x00\xa0\xff\xf0\xff\x00\x00\xc2\xff\xa6\xff\xb3\xff\x00\x00\xba\xff\xb8\xff\xb7\xff\xb6\xff\x00\x00\x00\x00\xa1\xff\xb0\xff\xaf\xff\xf5\xff\x00\x00\x00\x00\xf7\xff\x00\x00\x9f\xff\xc1\xff\xb9\xff\xf8\xff"#+happyDefActions = HappyA# 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 happyCheck :: HappyAddr-happyCheck = HappyA# 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= HappyA# 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 happyTable :: HappyAddr-happyTable = HappyA# 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-happyReduceArr = array (1, 118) [+happyReduceArr = array (1, 121) [ 	(1 , happyReduce_1), 	(2 , happyReduce_2), 	(3 , happyReduce_3),@@ -305,11 +317,14 @@ 	(115 , happyReduce_115), 	(116 , happyReduce_116), 	(117 , happyReduce_117),-	(118 , happyReduce_118)+	(118 , happyReduce_118),+	(119 , happyReduce_119),+	(120 , happyReduce_120),+	(121 , happyReduce_121) 	] -happy_n_terms = 74 :: Int-happy_n_nonterms = 24 :: Int+happy_n_terms = 72 :: Int+happy_n_nonterms = 26 :: Int  happyReduce_1 = happySpecReduce_1  0# happyReduction_1 happyReduction_1 happy_x_1@@ -482,7 +497,7 @@  happyReduce_16 = happySpecReduce_1  4# happyReduction_16 happyReduction_16 happy_x_1-	 =  case happyOut22 happy_x_1 of { happy_var_1 -> +	 =  case happyOut24 happy_x_1 of { happy_var_1 ->  	happyIn8 		 (happy_var_1 	)}@@ -807,9 +822,9 @@  happyReduce_50 = happySpecReduce_1  4# happyReduction_50 happyReduction_50 happy_x_1-	 =  case happyOutTok happy_x_1 of { (TString happy_var_1) -> +	 =  case happyOut21 happy_x_1 of { happy_var_1 ->  	happyIn8-		 (Astring happy_var_1+		 (happy_var_1 	)}  happyReduce_51 = happySpecReduce_1  4# happyReduction_51@@ -1060,8 +1075,9 @@ 	case happyOutTok happy_x_5 of { (QName happy_var_5) ->  	happyIn18 		 (if head happy_var_1 == Astring happy_var_5-						  	     then Ast "construction" (happy_var_1++[concatAll happy_var_3])-                                                          else error("Unmatched tags in element construction: "++(show (head happy_var_1))++" '"++happy_var_5++"'")+						  	     then Ast "element_construction" (happy_var_1++[Ast "append" happy_var_3])+                                                          else parseError [TError ("Unmatched tags in element construction: "+                                                                                   ++(show (head happy_var_1))++" '"++happy_var_5++"'")] 	) `HappyStk` happyRest}}}  happyReduce_77 = happyReduce 5# 14# happyReduction_77@@ -1075,8 +1091,9 @@ 	case happyOutTok happy_x_4 of { (QName happy_var_4) ->  	happyIn18 		 (if head happy_var_1 == Astring happy_var_4-							     then Ast "construction" (happy_var_1++[call "empty" []])-                                                          else error("Unmatched tags in element construction: "++(show (head happy_var_1))++" '"++happy_var_4++"'")+							     then Ast "element_construction" (happy_var_1++[Ast "append" []])+                                                          else parseError [TError ("Unmatched tags in element construction: "+                                                                                   ++(show (head happy_var_1))++" '"++happy_var_4++"'")] 	) `HappyStk` happyRest}}  happyReduce_78 = happySpecReduce_2  14# happyReduction_78@@ -1084,7 +1101,7 @@ 	happy_x_1 	 =  case happyOut19 happy_x_1 of { happy_var_1 ->  	happyIn18-		 (Ast "construction" (happy_var_1++[call "empty" []])+		 (Ast "element_construction" (happy_var_1++[Ast "append" []]) 	)}  happyReduce_79 = happyReduce 7# 14# happyReduction_79@@ -1099,7 +1116,7 @@ 	 = case happyOut8 happy_x_3 of { happy_var_3 ->  	case happyOut9 happy_x_6 of { happy_var_6 ->  	happyIn18-		 (Ast "element_construction" [happy_var_3,concatenateAll happy_var_6]+		 (Ast "element_construction" [happy_var_3,Ast "attributes" [],concatenateAll happy_var_6] 	) `HappyStk` happyRest}}  happyReduce_80 = happyReduce 7# 14# happyReduction_80@@ -1127,7 +1144,7 @@ 	 = case happyOutTok happy_x_2 of { (QName happy_var_2) ->  	case happyOut9 happy_x_4 of { happy_var_4 ->  	happyIn18-		 (Ast "element_construction" [Astring happy_var_2,concatenateAll happy_var_4]+		 (Ast "element_construction" [Astring happy_var_2,Ast "attributes" [],concatenateAll happy_var_4] 	) `HappyStk` happyRest}}  happyReduce_82 = happyReduce 5# 14# happyReduction_82@@ -1156,7 +1173,7 @@ 	happy_x_2 	happy_x_1 	 =  case happyOutTok happy_x_2 of { (QName happy_var_2) -> -	case happyOut21 happy_x_3 of { happy_var_3 -> +	case happyOut23 happy_x_3 of { happy_var_3 ->  	happyIn19 		 ([Astring happy_var_2,Ast "attributes" happy_var_3] 	)}}@@ -1230,248 +1247,262 @@ 		 (happy_var_1++[happy_var_2] 	)}} -happyReduce_93 = happySpecReduce_3  17# happyReduction_93-happyReduction_93 happy_x_3+happyReduce_93 = happySpecReduce_1  17# happyReduction_93+happyReduction_93 happy_x_1+	 =  case happyOut22 happy_x_1 of { happy_var_1 -> +	happyIn21+		 (if length happy_var_1 == 1 then head happy_var_1 else Ast "append" happy_var_1+	)}++happyReduce_94 = happySpecReduce_1  18# happyReduction_94+happyReduction_94 happy_x_1+	 =  case happyOutTok happy_x_1 of { (TString happy_var_1) -> +	happyIn22+		 (if happy_var_1=="" then [] else [Astring happy_var_1]+	)}++happyReduce_95 = happySpecReduce_3  18# happyReduction_95+happyReduction_95 happy_x_3 	happy_x_2 	happy_x_1-	 =  case happyOutTok happy_x_1 of { (QName happy_var_1) -> -	case happyOutTok happy_x_3 of { (TString happy_var_3) -> -	happyIn21-		 ([Ast "pair" [Astring happy_var_1,Astring happy_var_3]]+	 =  case happyOut9 happy_x_2 of { happy_var_2 -> +	happyIn22+		 ([concatenateAll happy_var_2]+	)}++happyReduce_96 = happySpecReduce_2  18# happyReduction_96+happyReduction_96 happy_x_2+	happy_x_1+	 =  case happyOut22 happy_x_1 of { happy_var_1 -> +	case happyOutTok happy_x_2 of { (TString happy_var_2) -> +	happyIn22+		 (if happy_var_2=="" then happy_var_1 else happy_var_1++[Astring happy_var_2] 	)}} -happyReduce_94 = happyReduce 5# 17# happyReduction_94-happyReduction_94 (happy_x_5 `HappyStk`-	happy_x_4 `HappyStk`+happyReduce_97 = happyReduce 4# 18# happyReduction_97+happyReduction_97 (happy_x_4 `HappyStk` 	happy_x_3 `HappyStk` 	happy_x_2 `HappyStk` 	happy_x_1 `HappyStk` 	happyRest)-	 = case happyOutTok happy_x_1 of { (QName happy_var_1) -> -	case happyOut8 happy_x_4 of { happy_var_4 -> -	happyIn21-		 ([Ast "pair" [Astring happy_var_1,happy_var_4]]+	 = case happyOut22 happy_x_1 of { happy_var_1 -> +	case happyOut9 happy_x_3 of { happy_var_3 -> +	happyIn22+		 (happy_var_1++[concatenateAll happy_var_3] 	) `HappyStk` happyRest}} -happyReduce_95 = happyReduce 4# 17# happyReduction_95-happyReduction_95 (happy_x_4 `HappyStk`-	happy_x_3 `HappyStk`-	happy_x_2 `HappyStk`-	happy_x_1 `HappyStk`-	happyRest)-	 = case happyOut21 happy_x_1 of { happy_var_1 -> -	case happyOutTok happy_x_2 of { (QName happy_var_2) -> -	case happyOutTok happy_x_4 of { (TString happy_var_4) -> -	happyIn21-		 (happy_var_1++[Ast "pair" [Astring happy_var_2,Astring happy_var_4]]-	) `HappyStk` happyRest}}}+happyReduce_98 = happySpecReduce_3  19# happyReduction_98+happyReduction_98 happy_x_3+	happy_x_2+	happy_x_1+	 =  case happyOutTok happy_x_1 of { (QName happy_var_1) -> +	case happyOut21 happy_x_3 of { happy_var_3 -> +	happyIn23+		 ([Ast "pair" [Astring happy_var_1,happy_var_3]]+	)}} -happyReduce_96 = happyReduce 6# 17# happyReduction_96-happyReduction_96 (happy_x_6 `HappyStk`-	happy_x_5 `HappyStk`-	happy_x_4 `HappyStk`+happyReduce_99 = happyReduce 4# 19# happyReduction_99+happyReduction_99 (happy_x_4 `HappyStk` 	happy_x_3 `HappyStk` 	happy_x_2 `HappyStk` 	happy_x_1 `HappyStk` 	happyRest)-	 = case happyOut21 happy_x_1 of { happy_var_1 -> +	 = case happyOut23 happy_x_1 of { happy_var_1 ->  	case happyOutTok happy_x_2 of { (QName happy_var_2) -> -	case happyOut8 happy_x_5 of { happy_var_5 -> -	happyIn21-		 (happy_var_1++[Ast "pair" [Astring happy_var_2,happy_var_5]]+	case happyOut21 happy_x_4 of { happy_var_4 -> +	happyIn23+		 (happy_var_1++[Ast "pair" [Astring happy_var_2,happy_var_4]] 	) `HappyStk` happyRest}}} -happyReduce_97 = happySpecReduce_1  18# happyReduction_97-happyReduction_97 happy_x_1-	 =  case happyOut25 happy_x_1 of { happy_var_1 -> -	happyIn22+happyReduce_100 = happySpecReduce_1  20# happyReduction_100+happyReduction_100 happy_x_1+	 =  case happyOut27 happy_x_1 of { happy_var_1 -> +	happyIn24 		 (Ast "step" (happy_var_1 "child_step" (Avar ".")) 	)} -happyReduce_98 = happySpecReduce_2  18# happyReduction_98-happyReduction_98 happy_x_2+happyReduce_101 = happySpecReduce_2  20# happyReduction_101+happyReduction_101 happy_x_2 	happy_x_1-	 =  case happyOut25 happy_x_2 of { happy_var_2 -> -	happyIn22+	 =  case happyOut27 happy_x_2 of { happy_var_2 -> +	happyIn24 		 (Ast "step" (happy_var_2 "attribute_step" (Avar ".")) 	)} -happyReduce_99 = happySpecReduce_2  18# happyReduction_99-happyReduction_99 happy_x_2+happyReduce_102 = happySpecReduce_2  20# happyReduction_102+happyReduction_102 happy_x_2 	happy_x_1-	 =  case happyOut25 happy_x_1 of { happy_var_1 -> -	case happyOut23 happy_x_2 of { happy_var_2 -> -	happyIn22+	 =  case happyOut27 happy_x_1 of { happy_var_1 -> +	case happyOut25 happy_x_2 of { happy_var_2 -> +	happyIn24 		 (Ast "step" [happy_var_2 (Ast "step" (happy_var_1 "child_step" (Avar ".")))] 	)}} -happyReduce_100 = happySpecReduce_3  18# happyReduction_100-happyReduction_100 happy_x_3+happyReduce_103 = happySpecReduce_3  20# happyReduction_103+happyReduction_103 happy_x_3 	happy_x_2 	happy_x_1-	 =  case happyOut25 happy_x_2 of { happy_var_2 -> -	case happyOut23 happy_x_3 of { happy_var_3 -> -	happyIn22+	 =  case happyOut27 happy_x_2 of { happy_var_2 -> +	case happyOut25 happy_x_3 of { happy_var_3 -> +	happyIn24 		 (Ast "step" (map happy_var_3 (happy_var_2 "attribute_step" (Avar "."))) 	)}} -happyReduce_101 = happySpecReduce_1  19# happyReduction_101-happyReduction_101 happy_x_1-	 =  case happyOut24 happy_x_1 of { happy_var_1 -> -	happyIn23+happyReduce_104 = happySpecReduce_1  21# happyReduction_104+happyReduction_104 happy_x_1+	 =  case happyOut26 happy_x_1 of { happy_var_1 -> +	happyIn25 		 (happy_var_1 	)} -happyReduce_102 = happySpecReduce_2  19# happyReduction_102-happyReduction_102 happy_x_2+happyReduce_105 = happySpecReduce_2  21# happyReduction_105+happyReduction_105 happy_x_2 	happy_x_1-	 =  case happyOut23 happy_x_1 of { happy_var_1 -> -	case happyOut24 happy_x_2 of { happy_var_2 -> -	happyIn23+	 =  case happyOut25 happy_x_1 of { happy_var_1 -> +	case happyOut26 happy_x_2 of { happy_var_2 -> +	happyIn25 		 (happy_var_2 . happy_var_1 	)}} -happyReduce_103 = happySpecReduce_2  20# happyReduction_103-happyReduction_103 happy_x_2+happyReduce_106 = happySpecReduce_2  22# happyReduction_106+happyReduction_106 happy_x_2 	happy_x_1-	 =  case happyOut25 happy_x_2 of { happy_var_2 -> -	happyIn24+	 =  case happyOut27 happy_x_2 of { happy_var_2 -> +	happyIn26 		 (\e -> Ast "step" (happy_var_2 "child_step" e) 	)} -happyReduce_104 = happySpecReduce_3  20# happyReduction_104-happyReduction_104 happy_x_3+happyReduce_107 = happySpecReduce_3  22# happyReduction_107+happyReduction_107 happy_x_3 	happy_x_2 	happy_x_1-	 =  case happyOut25 happy_x_3 of { happy_var_3 -> -	happyIn24+	 =  case happyOut27 happy_x_3 of { happy_var_3 -> +	happyIn26 		 (\e -> Ast "step" (happy_var_3 "attribute_step" e) 	)} -happyReduce_105 = happySpecReduce_3  20# happyReduction_105-happyReduction_105 happy_x_3+happyReduce_108 = happySpecReduce_3  22# happyReduction_108+happyReduction_108 happy_x_3 	happy_x_2 	happy_x_1-	 =  case happyOut25 happy_x_3 of { happy_var_3 -> -	happyIn24+	 =  case happyOut27 happy_x_3 of { happy_var_3 -> +	happyIn26 		 (\e -> Ast "step" (happy_var_3 "descendant_step" e) 	)} -happyReduce_106 = happyReduce 4# 20# happyReduction_106-happyReduction_106 (happy_x_4 `HappyStk`+happyReduce_109 = happyReduce 4# 22# happyReduction_109+happyReduction_109 (happy_x_4 `HappyStk` 	happy_x_3 `HappyStk` 	happy_x_2 `HappyStk` 	happy_x_1 `HappyStk` 	happyRest)-	 = case happyOut25 happy_x_4 of { happy_var_4 -> -	happyIn24+	 = case happyOut27 happy_x_4 of { happy_var_4 -> +	happyIn26 		 (\e -> Ast "step" (happy_var_4 "attribute_descendant_step" e) 	) `HappyStk` happyRest} -happyReduce_107 = happySpecReduce_2  20# happyReduction_107-happyReduction_107 happy_x_2+happyReduce_110 = happySpecReduce_2  22# happyReduction_110+happyReduction_110 happy_x_2 	happy_x_1-	 =  happyIn24+	 =  happyIn26 		 (\e -> Ast "step" [Ast "parent_step" [e]] 	) -happyReduce_108 = happySpecReduce_1  21# happyReduction_108-happyReduction_108 happy_x_1-	 =  case happyOut26 happy_x_1 of { happy_var_1 -> -	happyIn25+happyReduce_111 = happySpecReduce_1  23# happyReduction_111+happyReduction_111 happy_x_1+	 =  case happyOut28 happy_x_1 of { happy_var_1 -> +	happyIn27 		 (\t e -> [happy_var_1 t e] 	)} -happyReduce_109 = happyReduce 4# 21# happyReduction_109-happyReduction_109 (happy_x_4 `HappyStk`+happyReduce_112 = happyReduce 4# 23# happyReduction_112+happyReduction_112 (happy_x_4 `HappyStk` 	happy_x_3 `HappyStk` 	happy_x_2 `HappyStk` 	happy_x_1 `HappyStk` 	happyRest)-	 = case happyOut25 happy_x_1 of { happy_var_1 -> +	 = case happyOut27 happy_x_1 of { happy_var_1 ->  	case happyOut8 happy_x_3 of { happy_var_3 -> -	happyIn25+	happyIn27 		 (\t e -> (happy_var_1 t e)++[happy_var_3] 	) `HappyStk` happyRest}} -happyReduce_110 = happySpecReduce_1  22# happyReduction_110-happyReduction_110 happy_x_1-	 =  case happyOut27 happy_x_1 of { happy_var_1 -> -	happyIn26+happyReduce_113 = happySpecReduce_1  24# happyReduction_113+happyReduction_113 happy_x_1+	 =  case happyOut29 happy_x_1 of { happy_var_1 -> +	happyIn28 		 (\t e -> happy_var_1 t e 	)} -happyReduce_111 = happySpecReduce_1  22# happyReduction_111-happyReduction_111 happy_x_1-	 =  happyIn26+happyReduce_114 = happySpecReduce_1  24# happyReduction_114+happyReduction_114 happy_x_1+	 =  happyIn28 		 (\t e -> Ast t [Astring "*",e] 	) -happyReduce_112 = happySpecReduce_1  22# happyReduction_112-happyReduction_112 happy_x_1+happyReduce_115 = happySpecReduce_1  24# happyReduction_115+happyReduction_115 happy_x_1 	 =  case happyOutTok happy_x_1 of { (QName happy_var_1) -> -	happyIn26+	happyIn28 		 (\t e -> Ast t [Astring happy_var_1,e] 	)} -happyReduce_113 = happySpecReduce_1  23# happyReduction_113-happyReduction_113 happy_x_1+happyReduce_116 = happySpecReduce_1  25# happyReduction_116+happyReduction_116 happy_x_1 	 =  case happyOut7 happy_x_1 of { happy_var_1 -> -	happyIn27+	happyIn29 		 (\_ _ -> happy_var_1 	)} -happyReduce_114 = happySpecReduce_1  23# happyReduction_114-happyReduction_114 happy_x_1-	 =  happyIn27+happyReduce_117 = happySpecReduce_1  25# happyReduction_117+happyReduction_117 happy_x_1+	 =  happyIn29 		 (\_ e -> e 	) -happyReduce_115 = happySpecReduce_3  23# happyReduction_115-happyReduction_115 happy_x_3+happyReduce_118 = happySpecReduce_3  25# happyReduction_118+happyReduction_118 happy_x_3 	happy_x_2 	happy_x_1 	 =  case happyOut9 happy_x_2 of { happy_var_2 -> -	happyIn27+	happyIn29 		 (\t e -> if e == Avar "."                                                                      then concatenateAll happy_var_2 	                                                          else Ast "context" [e,Astring t,concatenateAll happy_var_2] 	)} -happyReduce_116 = happySpecReduce_2  23# happyReduction_116-happyReduction_116 happy_x_2+happyReduce_119 = happySpecReduce_2  25# happyReduction_119+happyReduction_119 happy_x_2 	happy_x_1-	 =  happyIn27+	 =  happyIn29 		 (\_ _ -> call "empty" [] 	) -happyReduce_117 = happyReduce 4# 23# happyReduction_117-happyReduction_117 (happy_x_4 `HappyStk`+happyReduce_120 = happyReduce 4# 25# happyReduction_120+happyReduction_120 (happy_x_4 `HappyStk` 	happy_x_3 `HappyStk` 	happy_x_2 `HappyStk` 	happy_x_1 `HappyStk` 	happyRest) 	 = case happyOutTok happy_x_1 of { (QName happy_var_1) ->  	case happyOut9 happy_x_3 of { happy_var_3 -> -	happyIn27-		 (\_ e -> if e == Avar "."+	happyIn29+		 (\t e -> if e == Avar "."                                                                      then call happy_var_1 happy_var_3-                                                                  else Ast "context" [e,call happy_var_1 happy_var_3]+                                                                  else Ast "context" [e,Astring t,call happy_var_1 happy_var_3] 	) `HappyStk` happyRest}} -happyReduce_118 = happySpecReduce_3  23# happyReduction_118-happyReduction_118 happy_x_3+happyReduce_121 = happySpecReduce_3  25# happyReduction_121+happyReduction_121 happy_x_3 	happy_x_2 	happy_x_1 	 =  case happyOutTok happy_x_1 of { (QName happy_var_1) -> -	happyIn27-		 (if elem happy_var_1 ["text"]-                                                             then \_ e -> call happy_var_1 [e]-                                                          else \_ _ -> call happy_var_1 []+	happyIn29+		 (\_ e -> call happy_var_1 (if e == Avar "." then [] else [e]) 	)}  happyNewToken action sts stk [] =-	happyDoAction 73# notHappyAtAll action sts stk []+	happyDoAction 71# notHappyAtAll action sts stk []  happyNewToken action sts stk (tk:tks) = 	let cont i = happyDoAction i tk action sts stk tks in@@ -1488,66 +1519,64 @@ 	RP -> cont 10#; 	LSB -> cont 11#; 	RSB -> cont 12#;-	LESCAPE -> cont 13#;-	RESCAPE -> cont 14#;-	TO -> cont 15#;-	PLUS -> cont 16#;-	MINUS -> cont 17#;-	TIMES -> cont 18#;-	DIV -> cont 19#;-	IDIV -> cont 20#;-	MOD -> cont 21#;-	TEQ -> cont 22#;-	TNE -> cont 23#;-	TLT -> cont 24#;-	TLE -> cont 25#;-	TGT -> cont 26#;-	TGE -> cont 27#;-	PRE -> cont 28#;-	POST -> cont 29#;-	IS -> cont 30#;-	SEQ -> cont 31#;-	SNE -> cont 32#;-	SLT -> cont 33#;-	SLE -> cont 34#;-	SGT -> cont 35#;-	SGE -> cont 36#;-	AND -> cont 37#;-	OR -> cont 38#;-	NOT -> cont 39#;-	UNION -> cont 40#;-	INTERSECT -> cont 41#;-	EXCEPT -> cont 42#;-	FOR -> cont 43#;-	LET -> cont 44#;-	IN -> cont 45#;-	COMMA -> cont 46#;-	ASSIGN -> cont 47#;-	WHERE -> cont 48#;-	ORDER -> cont 49#;-	BY -> cont 50#;-	ASCENDING -> cont 51#;-	DESCENDING -> cont 52#;-	ELEMENT -> cont 53#;-	ATTRIBUTE -> cont 54#;-	STAG -> cont 55#;-	ETAG -> cont 56#;-	SATISFIES -> cont 57#;-	ATSIGN -> cont 58#;-	SLASH -> cont 59#;-	QName happy_dollar_dollar -> cont 60#;-	DECLARE -> cont 61#;-	FUNCTION -> cont 62#;-	VARIABLE -> cont 63#;-	AT -> cont 64#;-	DOTS -> cont 65#;-	DOT -> cont 66#;-	SEMI -> cont 67#;-	Variable happy_dollar_dollar -> cont 68#;-	XMLtext happy_dollar_dollar -> cont 69#;-	TInteger happy_dollar_dollar -> cont 70#;-	TFloat happy_dollar_dollar -> cont 71#;-	TString happy_dollar_dollar -> cont 72#;+	TO -> cont 13#;+	PLUS -> cont 14#;+	MINUS -> cont 15#;+	TIMES -> cont 16#;+	DIV -> cont 17#;+	IDIV -> cont 18#;+	MOD -> cont 19#;+	TEQ -> cont 20#;+	TNE -> cont 21#;+	TLT -> cont 22#;+	TLE -> cont 23#;+	TGT -> cont 24#;+	TGE -> cont 25#;+	PRE -> cont 26#;+	POST -> cont 27#;+	IS -> cont 28#;+	SEQ -> cont 29#;+	SNE -> cont 30#;+	SLT -> cont 31#;+	SLE -> cont 32#;+	SGT -> cont 33#;+	SGE -> cont 34#;+	AND -> cont 35#;+	OR -> cont 36#;+	NOT -> cont 37#;+	UNION -> cont 38#;+	INTERSECT -> cont 39#;+	EXCEPT -> cont 40#;+	FOR -> cont 41#;+	LET -> cont 42#;+	IN -> cont 43#;+	COMMA -> cont 44#;+	ASSIGN -> cont 45#;+	WHERE -> cont 46#;+	ORDER -> cont 47#;+	BY -> cont 48#;+	ASCENDING -> cont 49#;+	DESCENDING -> cont 50#;+	ELEMENT -> cont 51#;+	ATTRIBUTE -> cont 52#;+	STAG -> cont 53#;+	ETAG -> cont 54#;+	SATISFIES -> cont 55#;+	ATSIGN -> cont 56#;+	SLASH -> cont 57#;+	QName happy_dollar_dollar -> cont 58#;+	DECLARE -> cont 59#;+	FUNCTION -> cont 60#;+	VARIABLE -> cont 61#;+	AT -> cont 62#;+	DOTS -> cont 63#;+	DOT -> cont 64#;+	SEMI -> cont 65#;+	Variable happy_dollar_dollar -> cont 66#;+	XMLtext happy_dollar_dollar -> cont 67#;+	TInteger happy_dollar_dollar -> cont 68#;+	TFloat happy_dollar_dollar -> cont 69#;+	TString happy_dollar_dollar -> cont 70#; 	_ -> happyError' (tk:tks) 	} @@ -1588,8 +1617,8 @@  instance Show Ast   where show (Ast s []) = s ++ "()"-        show (Ast s (x:xs)) = s ++ "(" ++ (show x)-                              ++ (foldr (\a r -> ","++(show a)++r) "" xs)+        show (Ast s (x:xs)) = s ++ "(" ++ show x+                              ++ foldr (\a r -> ","++show a++r) "" xs                               ++ ")"         show (Avar s) = s         show (Aint n) = show n@@ -1597,23 +1626,45 @@         show (Astring s) = "\'" ++ s ++ "\'"  +screenSize = 80::Int++prettyAst :: Ast -> Int -> (String,Int)+prettyAst (Avar s) p = (s,(length s)+p)+prettyAst (Aint n) p = let s = show n in (s,(length s)+p)+prettyAst (Afloat n) p = let s = show n in (s,(length s)+p)+prettyAst (Astring s) p = ("\'" ++ s ++ "\'",(length s)+p+2)+prettyAst (Ast s args) p+    = let (ps,np) = prettyArgs args+      in (s++"("++ps++")",np+1)+    where prettyArgs [] = ("",p+1)+          prettyArgs xs = let ss = show (head xs) ++ foldr (\a r -> ","++show a++r) "" (tail xs)+                              np = (length s)+p+1+                          in if (length ss)+p < screenSize+                             then (ss,(length ss)+p)+                             else let ds = map (\x -> let (s,ep) = prettyAst x np+                                                      in (s ++ ",\n" ++ space np,ep)) (init xs)+                                      (ls,lp) = prettyAst (last xs) np+                                  in (concatMap fst ds ++ ls,lp)+          space n = replicate n ' '+++ppAst :: Ast -> String+ppAst e = let (s,_) = prettyAst e 0 in s++ call :: String -> [Ast] -> Ast call name args = Ast "call" ((Avar name):args)   concatenateAll :: [Ast] -> Ast+concatenateAll [x] = x concatenateAll (x:xs) = foldl (\a r -> call "concatenate" [a,r]) x xs concatenateAll _ = call "empty" []  -concatAll :: [Ast] -> Ast-concatAll (x:xs) = foldl (\a r -> call "concat" [a,r]) x xs-concatAll _ = call "empty" []-- data Token   = RETURN | SOME | EVERY | IF | THEN | ELSE | LB | RB | LP | RP | LSB | RSB-  | LESCAPE | RESCAPE | TO | PLUS | MINUS | TIMES | DIV | IDIV | MOD+  | TO | PLUS | MINUS | TIMES | DIV | IDIV | MOD   | TEQ | TNE | TLT | TLE | TGT | TGE | SEQ | SNE | SLT | SLE | SGT | SGE   | AND | OR | NOT | UNION | INTERSECT | EXCEPT | FOR | LET | IN | COMMA   | ASSIGN | WHERE | ORDER | BY | ASCENDING | DESCENDING | ELEMENT@@ -1631,6 +1682,7 @@ 	  show (TInteger n) = "Integer("++(show n)++")" 	  show (TFloat n) = "Double("++(show n)++")" 	  show (TString s) = "String("++s++")"+	  show (TError s) = "'"++s++"'"           show t = case filter (\(n,_) -> n==t) tokenList of                      (_,b):_ -> b                      _ -> "Illegal token"@@ -1638,7 +1690,7 @@  tokenList :: [(Token,String)] tokenList = [(RETURN,"return"),(SOME,"some"),(EVERY,"every"),(IF,"if"),(THEN,"then"),(ELSE,"else"),-             (LB,"["),(RB,"]"),(LP,"("),(RP,")"),(LSB,"{"),(RSB,"}"),(LESCAPE,"\"{"),(RESCAPE,"}\""),+             (LB,"["),(RB,"]"),(LP,"("),(RP,")"),(LSB,"{"),(RSB,"}"),              (TO,"to"),(PLUS,"+"),(MINUS,"-"),(TIMES,"*"),(DIV,"div"),(IDIV,"idiv"),(MOD,"mod"),              (TEQ,"="),(TNE,"!="),(TLT,"<"),(TLE,"<="),(TGT,">"),(TGE,">="),(PRE,"<<"),(POST,">>"),              (IS,"is"),(SEQ,"eq"),(SNE,"ne"),(SLT,"lt"),(SLE,"le"),(SGT,"gt"),(SGE,"ge"),(AND,"and"),@@ -1650,50 +1702,60 @@              (AT,"at"),(DOTS,".."),(DOT,"."),(SEMI,";")]  -parseError [] = error "Reached end-of-input"-parseError [_] = error "Reached end-of-input"-parseError tk = error("Parse error: "++(show (take 10 (init tk))))+parseError tk = error (case tk of+                         ((TError s):_) -> "Parse error: "++s+                         _ -> "Parse error: "++(foldr (\a r -> (show a)++" "++r) "" (take 20 tk)))   scan :: String -> [Token]-scan cs = lexer cs [0]+scan cs = lexer cs "" + xmlText :: String -> [Token] xmlText "" = [] xmlText text = [XMLtext text] + -- scans XML syntax and returns an XMLtext token with the text-xml :: String -> String -> [Int] -> [Token]-xml ('{':cs) text n = (xmlText text)++(LSB : lexer cs (0:n))-xml ('<':'/':cs) text n = (xmlText text)++(STAG : lexer cs n)+xml :: String -> String -> String -> [Token]+xml ('{':cs) text n = (xmlText text)++(LSB : lexer cs ('{':n))+xml ('<':'/':cs) text n = (xmlText text)++(STAG : lexer cs ('<':'/':n)) xml ('<':'!':'-':cs) text n = xmlComment cs (text++"<!-") n-xml ('<':cs) text (k:n) = (xmlText text)++(TLT : lexer cs (k+2:n))-xml ('\'':'{':cs) text n = (xmlText text)++(LESCAPE : lexer cs n)-xml ('\"':'{':cs) text n = (xmlText text)++(LESCAPE : lexer cs n)+xml ('<':cs) text n = (xmlText text)++(TLT : lexer cs ('<':n)) xml ('(':':':cs) text n = xqComment cs text n xml (c:cs) text n = xml cs (text++[c]) n xml [] text _ = xmlText text -xqComment :: String -> String -> [Int] -> [Token]++xqComment :: String -> String -> String -> [Token] xqComment (':':')':cs) text n = xml cs text n xqComment (_:cs) text n = xqComment cs text n xqComment [] text _ = xmlText text -xmlComment :: String -> String -> [Int] -> [Token]++xmlComment :: String -> String -> String -> [Token] xmlComment ('-':'>':cs) text n = xml cs (text++"->") n xmlComment (c:cs) text n = xmlComment cs (text++[c]) n xmlComment [] text _ = xmlText text + isQN :: Char -> Bool isQN c = elem c "_:-" || isDigit c || isAlpha c + isVar :: Char -> Bool isVar c = elem c "_" || isDigit c || isAlpha c ++inXML :: String -> Bool+inXML ('>':'<':_) = True+inXML _ = False++ -- the XQuery scanner-lexer :: String -> [Int] -> [Token]-lexer [] [0] = []-lexer [] _ = error "Unbalanced tags"+lexer :: String -> String -> [Token]+lexer [] "" = []+lexer [] _ = [ TError "Unexpected end of input" ] lexer (' ':'>':' ':cs) n = TGT : lexer cs n lexer (c:cs) n       | isSpace c = lexer cs n@@ -1702,46 +1764,50 @@ lexer ('$':c:cs) n | isAlpha c       = let (var,rest) = span isVar (c:cs)         in (Variable var) : lexer rest n-lexer ('\'':'{':cs) n = LESCAPE : lexer cs n-lexer ('\"':'{':cs) n = LESCAPE : lexer cs n lexer (':':'=':cs) n = ASSIGN : lexer cs n-lexer ('<':'/':cs) n = STAG : lexer cs n+lexer ('<':'/':cs) n = STAG : lexer cs ('<':'/':n) lexer ('<':'=':cs) n = TLE : lexer cs n lexer ('>':'=':cs) n = TGE : lexer cs n lexer ('<':'<':cs) n = PRE : lexer cs n lexer ('>':'>':cs) n = POST : lexer cs n-lexer ('/':'>':cs) (k:n) = ETAG : lexer cs (k-2:n)+lexer ('/':'>':cs) m = case m of+                         '<':n -> ETAG : (if inXML n then xml cs "" n else lexer cs n)+                         _ -> [ TError "Unexpected token: '/>'" ] lexer ('(':':':cs) n = lexComment cs n lexer ('<':'!':'-':cs) n = lexXmlComment cs "<!-" n lexer ('.':'.':cs) n = DOTS : lexer cs n lexer ('.':cs) n = DOT : lexer cs n-lexer ('}':'\'':cs) n = RESCAPE : lexer cs n-lexer ('}':'\"':cs) n = RESCAPE : lexer cs n lexer ('!':'=':cs) n = TNE : lexer cs n-lexer ('\'':cs) n = lexString cs n-lexer ('\"':cs) n = lexString2 cs n+lexer ('\'':cs) n = lexString cs "" ('\'':n)+lexer ('\"':cs) n = lexString cs "" ('\"': n) lexer ('[':cs) n = LB : lexer cs n lexer (']':cs) n = RB : lexer cs n lexer ('(':cs) n = LP : lexer cs n lexer (')':cs) n = RP : lexer cs n-lexer ('}':cs) [_,n] = RSB : lexer cs [n]-lexer ('}':cs) (_:n:ns) = RSB : (if n==0 then lexer cs (n:ns) else xml cs "" (n:ns))+lexer ('}':cs) m = case m of+                     '{':'\"':n -> RSB : lexString cs "" ('\"':n)+                     '{':'\'':n -> RSB : lexString cs "" ('\'':n)+                     '{':n -> RSB : (if inXML n then xml cs "" n else lexer cs n)+                     _ -> [ TError "Unexpected token: '}'" ] lexer ('+':cs) n = PLUS : lexer cs n lexer ('-':cs) n = MINUS : lexer cs n lexer ('*':cs) n = TIMES : lexer cs n lexer ('=':cs) n = TEQ : lexer cs n-lexer ('<':c:cs) n | not(isAlpha c) = TLT : lexer (c:cs) n-lexer ('<':cs) (k:n) = TLT : lexer cs (k+2:n)-lexer ('>':cs) (k:n) = TGT : (if k==1 then lexer cs (0:n) else xml cs "" (k-1:n))+lexer ('<':c:cs) n = TLT : (lexer (c:cs) (if isAlpha c then ('<':n) else n))+lexer ('>':cs) m = case m of+                     '<':'/':'>':'<':n -> TGT : (if inXML n then xml cs "" n else lexer cs n)+                     '<':n -> TGT : xml cs "" ('>':m) +                     _ -> TGT : lexer cs m lexer (',':cs) n = COMMA : lexer cs n lexer ('@':cs) n = ATSIGN : lexer cs n lexer ('/':cs) n = SLASH : lexer cs n-lexer ('{':cs) n = LSB : lexer cs (0:n)+lexer ('{':cs) n = LSB : lexer cs ('{':n) lexer ('|':cs) n = UNION : lexer cs n lexer (';':cs) n = SEMI : lexer cs n-lexer (c:cs) n = error("Illegal character "++[c])+lexer (c:cs) n = TError ("Illegal character: '"++[c,'\'']) : lexer cs n -lexNum :: String -> [Int] -> [Token]++lexNum :: String -> String -> [Token] lexNum cs n = if null rest || head rest /= '.'                  then TInteger (read k) : lexer rest n               else let (m,rest2) = span isDigit (tail rest)@@ -1752,68 +1818,75 @@                         _ -> (TFloat val) : lexer rest2 n       where (k,rest) = span isDigit cs -lexString :: String -> [Int] -> [Token]-lexString cs n = TString s : lexer (tail rest) n-    where (s,rest) = span inString cs-          inString c = c /= '\'' -lexString2 :: String -> [Int] -> [Token]-lexString2 cs n = TString s : lexer (tail rest) n-    where (s,rest) = span inString cs-          inString c = c /= '\"'+lexString :: String -> String -> String -> [Token]+lexString ('\"':cs) s m = case m of+                            '\"':n -> (TString s) : (lexer cs n)+                            _ -> lexString cs (s++"\"") m+lexString ('\'':cs) s m = case m of+                            '\'':n -> (TString s) : (lexer cs n)+                            _ -> lexString cs (s++"\'") m+lexString ('{':cs) s n = (TString s) : LSB : (lexer cs ('{':n))+lexString (c:cs) s n = lexString cs (s++[c]) n+lexString [] s n = [ TError "End of input while in string" ] -lexComment :: String -> [Int] -> [Token]++lexComment :: String -> String -> [Token] lexComment (':':')':cs) n = lexer cs n lexComment (_:cs) n = lexComment cs n-lexComment [] n = []+lexComment [] n = [ TError "End of input while in comment" ] -lexXmlComment :: String -> String -> [Int] -> [Token]++lexXmlComment :: String -> String -> String -> [Token] lexXmlComment ('-':'>':cs) text n = (xmlText (text++"->"))++(lexer cs n) lexXmlComment (c:cs) text n = lexXmlComment cs (text++[c]) n lexXmlComment [] text _ = xmlText text -lexVar :: String -> [Int] -> [Token]++lexVar :: String -> String -> [Token] lexVar cs n =-   case span isQN cs of-      ("return",rest) -> RETURN : lexer rest n-      ("some",rest) -> SOME : lexer rest n-      ("every",rest) -> EVERY : lexer rest n-      ("if",rest) -> IF : lexer rest n-      ("then",rest) -> THEN : lexer rest n-      ("else",rest) -> ELSE : lexer rest n-      ("to",rest) -> TO : lexer rest n-      ("div",rest) -> DIV : lexer rest n-      ("idiv",rest) -> IDIV : lexer rest n-      ("mod",rest) -> MOD : lexer rest n-      ("and",rest) -> AND : lexer rest n-      ("or",rest) -> OR : lexer rest n-      ("not",rest) -> NOT : lexer rest n-      ("union",rest) -> UNION : lexer rest n-      ("intersect",rest) -> INTERSECT : lexer rest n-      ("except",rest) -> EXCEPT : lexer rest n-      ("for",rest) -> FOR : lexer rest n-      ("let",rest) -> LET : lexer rest n-      ("in",rest) -> IN : lexer rest n-      ("where",rest) -> WHERE : lexer rest n-      ("order",rest) -> ORDER : lexer rest n-      ("by",rest) -> BY : lexer rest n-      ("ascending",rest) -> ASCENDING : lexer rest n-      ("descending",rest) -> DESCENDING : lexer rest n-      ("element",rest) -> ELEMENT : lexer rest n-      ("attribute",rest) -> ATTRIBUTE : lexer rest n-      ("satisfies",rest) -> SATISFIES : lexer rest n-      ("declare",rest) -> DECLARE : lexer rest n-      ("function",rest) -> FUNCTION : lexer rest n-      ("variable",rest) -> VARIABLE : lexer rest n-      ("at",rest) -> AT : lexer rest n-      ("eq",rest) -> SEQ : lexer rest n-      ("ne",rest) -> SNE : lexer rest n-      ("lt",rest) -> SLT : lexer rest n-      ("le",rest) -> SLE : lexer rest n-      ("gt",rest) -> SGT : lexer rest n-      ("ge",rest) -> SGE : lexer rest n-      ("is",rest) -> IS : lexer rest n-      (var,rest) -> QName var : lexer rest n+    let (nm,rest) = span isQN cs+    in (case nm of+          "return" -> RETURN+          "some" -> SOME+          "every" -> EVERY+          "if" -> IF+          "then" -> THEN+          "else" -> ELSE+          "to" -> TO+          "div" -> DIV+          "idiv" -> IDIV+          "mod" -> MOD+          "and" -> AND+          "or" -> OR+          "not" -> NOT+          "union" -> UNION+          "intersect" -> INTERSECT+          "except" -> EXCEPT+          "for" -> FOR+          "let" -> LET+          "in" -> IN+          "where" -> WHERE+          "order" -> ORDER+          "by" -> BY+          "ascending" -> ASCENDING+          "descending" -> DESCENDING+          "element" -> ELEMENT+          "attribute" -> ATTRIBUTE+          "satisfies" -> SATISFIES+          "declare" -> DECLARE+          "function" -> FUNCTION+          "variable" -> VARIABLE+          "at" -> AT+          "eq" -> SEQ+          "ne" -> SNE+          "lt" -> SLT+          "le" -> SLE+          "gt" -> SGT+          "ge" -> SGE+          "is" -> IS+          var -> QName var+       ) : lexer rest n {-# LINE 1 "templates/GenericTemplate.hs" #-} {-# LINE 1 "templates/GenericTemplate.hs" #-} {-# LINE 1 "<built-in>" #-}
XML/HXQ/XQuery.hs view
@@ -4,7 +4,7 @@ - Programmer: Leonidas Fegaras - Email: fegaras@cse.uta.edu - Web: http://lambda.uta.edu/-- Creation: 03/22/08, last update: 05/06/08+- Creation: 03/22/08, last update: 05/30/08 -  - Copyright (c) 2008 by Leonidas Fegaras, the University of Texas at Arlington. All rights reserved. - This material is provided as is, with absolutely no warranty expressed or implied.@@ -13,10 +13,11 @@ - --------------------------------------------------------------------------------------} + -- | HXQ is a fast and space-efficient compiler from XQuery (the standard -- query language for XML) to embedded Haskell code. The translation is -- based on Haskell templates. It also provides an interpreter for--- evaluating ad-hoc XQueries read from input or from files.+-- evaluating ad-hoc XQueries read from input or from files and database connectivity using HDBC. -- For more information, look at <http://lambda.uta.edu/HXQ/>. module XML.HXQ.XQuery (        -- * The XML Data Representation@@ -24,10 +25,19 @@        -- * The XQuery Compiler        xq, xe,        -- * The XQuery Interpreter-       xquery, xfile+       xquery, xfile,+       -- * The XQuery Compiler with Database Connectivity+       xqdb, connect, disconnect, prepareSQL, executeSQL,+       -- * The XQuery Interpreter with Database Connectivity+       xqueryDB, xfileDB,+       -- * Shredding and Publishing XML Documents Using a Relational Database+       shred, createIndex     ) where  import HXML(AttList) import XML.HXQ.XTree import XML.HXQ.Compiler import XML.HXQ.Interpreter+import XML.HXQ.DB+import XML.HXQ.DBConnect+import Database.HDBC(disconnect)
− XML/HXQ/XQueryDB.hs
@@ -1,38 +0,0 @@-{----------------------------------------------------------------------------------------- The XQuery Compiler and Interpreter with HDBC connectivity-- Programmer: Leonidas Fegaras-- Email: fegaras@cse.uta.edu-- Web: http://lambda.uta.edu/-- Creation: 05/12/08, last update: 05/12/08-- -- Copyright (c) 2008 by Leonidas Fegaras, the University of Texas at Arlington. All rights reserved.-- This material is provided as is, with absolutely no warranty expressed or implied.-- Any use is at your own risk. Permission is hereby granted to use or copy this program-- for any purpose, provided the above notices are retained on all copies.-----------------------------------------------------------------------------------------}----- | HXQ is a fast and space-efficient compiler from XQuery (the standard--- query language for XML) to embedded Haskell code. The translation is--- based on Haskell templates. It also provides an interpreter for--- evaluating ad-hoc XQueries read from input or from files.--- For more information, look at <http://lambda.uta.edu/HXQ/>.-module XML.HXQ.XQueryDB (-       -- * The XML Data Representation-       XTree(..), XSeq, Tag, AttList, putXSeq,-       -- * The XQuery Compiler-       xq, xe,-       -- * The XQuery Interpreter-       xquery, xfile,-       -- * The XQuery Compiler with Database Connectivity-       xqdb, disconnect, prepareSQL, executeSQL-    ) where--import HXML(AttList)-import XML.HXQ.XTree-import XML.HXQ.Compiler-import XML.HXQ.Interpreter-import XML.HXQ.DB-import Database.HDBC(disconnect)
XML/HXQ/XTree.hs view
@@ -1,10 +1,10 @@ {------------------------------------------------------------------------------------- --- XML Trees (rose trees)+- XML Trees (represented as rose trees) - Programmer: Leonidas Fegaras - Email: fegaras@cse.uta.edu - Web: http://lambda.uta.edu/-- Creation: 05/01/08, last update: 05/05/08+- Creation: 05/01/08, last update: 05/30/08 -  - Copyright (c) 2008 by Leonidas Fegaras, the University of Texas at Arlington. All rights reserved. - This material is provided as is, with absolutely no warranty expressed or implied.@@ -22,8 +22,13 @@ import System.IO import XMLParse(XMLEvent(..)) import HXML(AttList)+import XML.HXQ.Parser(Ast(..))+import Database.HDBC(Statement)  +instance Eq Statement where x == y = False++ type Tag = String  @@ -38,23 +43,26 @@            |  XGERef   Tag		-- ^ general entity reference            |  XComment String		-- ^ comment            |  XError   String		-- ^ error report+           |  XStmt    Statement        -- ^ used internally to wrap an SQL statement+           |  XNoPad                    -- ^ marker for no padding in XSeq            deriving Eq + type XSeq = [XTree]   showAL :: AttList -> String-showAL = foldr(\(a,v) r -> " "++a++"=\""++v++"\""++r) []+showAL = foldr (\(a,v) r -> " "++a++"=\""++v++"\""++r) []  showXT :: XTree -> Bool -> String showXT e pad     = case e of-        XElem tag al _ [] -> "<"++tag++(showAL al)++"/>"-        XElem tag al _ xs -> "<"++tag++(showAL al)++">"++(showXS xs)++"</"++tag++">"-        XText text -> text-        XInt n -> p++(show n)-        XFloat n -> p++(show n)-        XBool v -> p++(if v then "true" else "false")+        XElem tag al _ [] -> "<"++tag++showAL al++"/>"+        XElem tag al _ xs -> "<"++tag++showAL al++">"++showXS xs++"</"++tag++">"+        XText text -> p++text+        XInt n -> p++show n+        XFloat n -> p++show n+        XBool v -> p++if v then "true" else "false"         XComment s -> "<!--"++s++"-->"         XPI n s -> "<?"++n++" "++s++">"         XError s -> error s@@ -63,15 +71,19 @@  showXS :: XSeq -> String showXS [] = ""-showXS (x:xs) = (showXT x False) ++ (concatMap (\x -> showXT x True) xs)+showXS (x:xs) = showXT x False ++ sXS xs+    where sXS (XNoPad:x:xs) = (showXT x False) ++ sXS xs+          sXS (x:xs) = (showXT x True) ++ sXS xs+          sXS _ = ""  instance Show XTree where     show t = showXT t False  --- | Print the XQuery result (which is a sequence of XML fragments) with no waiting+-- | Print the XQuery result (which is a sequence of XML fragments) without buffering. putXSeq :: XSeq -> IO () putXSeq xs = hSetBuffering stdout NoBuffering >> putStrLn (showXS xs)+   {--------------- Build the rose tree from the XML stream ----------------------------}
XQueryParser.y view
@@ -4,7 +4,7 @@ - Programmer: Leonidas Fegaras - Email: fegaras@cse.uta.edu - Web: http://lambda.uta.edu/-- Creation: 02/15/08, last update: 05/01/08+- Creation: 02/15/08, last update: 05/15/08 -  - Copyright (c) 2008 by Leonidas Fegaras, the University of Texas at Arlington. All rights reserved. - This material is provided as is, with absolutely no warranty expressed or implied.@@ -35,9 +35,7 @@ 	')' 		{ RP } 	'{' 		{ LSB } 	'}' 		{ RSB }-	'\'{' 		{ LESCAPE }-	'}\'' 		{ RESCAPE }-	'to' 		{ TO }+        'to' 		{ TO } 	'+' 		{ PLUS } 	'-' 		{ MINUS } 	'*' 		{ TIMES }@@ -175,7 +173,7 @@ 		|   '+' expr       %prec UMINUS		{ call "uplus" [$2] } 		|   '-' expr       %prec UMINUS		{ call "uminus" [$2] } 		|   'not' expr     %prec UMINUS		{ call "not" [$2] }-		|   'String'				{ Astring $1 }+		|   string				{ $1 } 		|   'Integer'				{ Aint $1 } 		|   'Double'				{ Afloat $1 } @@ -225,15 +223,17 @@  element        :: { Ast } element		:   stag '>' content '</' 'QName' '>'	{ if head $1 == Astring $5-						  	     then Ast "construction" ($1++[concatAll $3])-                                                          else error("Unmatched tags in element construction: "++(show (head $1))++" '"++$5++"'") }+						  	     then Ast "element_construction" ($1++[Ast "append" $3])+                                                          else parseError [TError ("Unmatched tags in element construction: "+                                                                                   ++(show (head $1))++" '"++$5++"'")] }                 |   stag '>' '</' 'QName' '>'		{ if head $1 == Astring $4-							     then Ast "construction" ($1++[call "empty" []])-                                                          else error("Unmatched tags in element construction: "++(show (head $1))++" '"++$4++"'") }-                |   stag '/>'     			{ Ast "construction" ($1++[call "empty" []]) }-                |   'element' '{' expr '}' '{' expl '}'	{ Ast "element_construction" [$3,concatenateAll $6] }+							     then Ast "element_construction" ($1++[Ast "append" []])+                                                          else parseError [TError ("Unmatched tags in element construction: "+                                                                                   ++(show (head $1))++" '"++$4++"'")] }+                |   stag '/>'     			{ Ast "element_construction" ($1++[Ast "append" []]) }+                |   'element' '{' expr '}' '{' expl '}'	{ Ast "element_construction" [$3,Ast "attributes" [],concatenateAll $6] }                 |   'attribute' '{' expr '}''{' expl '}'{ Ast "attribute_construction" [$3,concatenateAll $6] }-                |   'element' 'QName' '{' expl '}'	{ Ast "element_construction" [Astring $2,concatenateAll $4] }+                |   'element' 'QName' '{' expl '}'	{ Ast "element_construction" [Astring $2,Ast "attributes" [],concatenateAll $4] }                 |   'attribute' 'QName' '{' expl '}'    { Ast "attribute_construction" [Astring $2,concatenateAll $4] }  stag           :: { [ Ast ] }@@ -250,12 +250,18 @@ 		|   content 'XMLtext'			{ $1++[Astring $2] } 		|   content element			{ $1++[$2] } +string         :: { Ast }+string          : stringc                               { if length $1 == 1 then head $1 else Ast "append" $1 }++stringc        :: { [Ast] }+stringc         :   'String'                            { if $1=="" then [] else [Astring $1] }+                |   '{' expl '}'                        { [concatenateAll $2] }+                |   stringc 'String'                    { if $2=="" then $1 else $1++[Astring $2] }+                |   stringc '{' expl '}'                { $1++[concatenateAll $3] }+ attributes     :: { [ Ast ] }-attributes	:   'QName' '=' 'String'		{ [Ast "pair" [Astring $1,Astring $3]] }-		|   'QName' '=' '\'{' expr '}\''	{ [Ast "pair" [Astring $1,$4]] }-		|   attributes 'QName' '=' 'String'	{ $1++[Ast "pair" [Astring $2,Astring $4]] }-		|   attributes 'QName' '='-                         '\'{' expr '}\''		{ $1++[Ast "pair" [Astring $2,$5]] }+attributes	:   'QName' '=' string  	        { [Ast "pair" [Astring $1,$3]] }+		|   attributes 'QName' '=' string	{ $1++[Ast "pair" [Astring $2,$4]] }  full_path      :: { Ast } full_path       :   predicate_step                      { Ast "step" ($1 "child_step" (Avar ".")) }@@ -290,13 +296,10 @@                                                                      then concatenateAll $2 	                                                          else Ast "context" [e,Astring t,concatenateAll $2] }                 |   '(' ')'                             { \_ _ -> call "empty" [] }-                |   'QName' '(' expl ')'                { \_ e -> if e == Avar "."+                |   'QName' '(' expl ')'                { \t e -> if e == Avar "."                                                                      then call $1 $3-                                                                  else Ast "context" [e,call $1 $3] }-                |   'QName' '(' ')'                     { if elem $1 ["text"]-                                                             then \_ e -> call $1 [e]-                                                          else \_ _ -> call $1 [] }-+                                                                  else Ast "context" [e,Astring t,call $1 $3] }+                |   'QName' '(' ')'                     { \_ e -> call $1 (if e == Avar "." then [] else [e]) }  { @@ -311,8 +314,8 @@  instance Show Ast   where show (Ast s []) = s ++ "()"-        show (Ast s (x:xs)) = s ++ "(" ++ (show x)-                              ++ (foldr (\a r -> ","++(show a)++r) "" xs)+        show (Ast s (x:xs)) = s ++ "(" ++ show x+                              ++ foldr (\a r -> ","++show a++r) "" xs                               ++ ")"         show (Avar s) = s         show (Aint n) = show n@@ -320,23 +323,45 @@         show (Astring s) = "\'" ++ s ++ "\'"  +screenSize = 80::Int++prettyAst :: Ast -> Int -> (String,Int)+prettyAst (Avar s) p = (s,(length s)+p)+prettyAst (Aint n) p = let s = show n in (s,(length s)+p)+prettyAst (Afloat n) p = let s = show n in (s,(length s)+p)+prettyAst (Astring s) p = ("\'" ++ s ++ "\'",(length s)+p+2)+prettyAst (Ast s args) p+    = let (ps,np) = prettyArgs args+      in (s++"("++ps++")",np+1)+    where prettyArgs [] = ("",p+1)+          prettyArgs xs = let ss = show (head xs) ++ foldr (\a r -> ","++show a++r) "" (tail xs)+                              np = (length s)+p+1+                          in if (length ss)+p < screenSize+                             then (ss,(length ss)+p)+                             else let ds = map (\x -> let (s,ep) = prettyAst x np+                                                      in (s ++ ",\n" ++ space np,ep)) (init xs)+                                      (ls,lp) = prettyAst (last xs) np+                                  in (concatMap fst ds ++ ls,lp)+          space n = replicate n ' '+++ppAst :: Ast -> String+ppAst e = let (s,_) = prettyAst e 0 in s++ call :: String -> [Ast] -> Ast call name args = Ast "call" ((Avar name):args)   concatenateAll :: [Ast] -> Ast+concatenateAll [x] = x concatenateAll (x:xs) = foldl (\a r -> call "concatenate" [a,r]) x xs concatenateAll _ = call "empty" []  -concatAll :: [Ast] -> Ast-concatAll (x:xs) = foldl (\a r -> call "concat" [a,r]) x xs-concatAll _ = call "empty" []-- data Token   = RETURN | SOME | EVERY | IF | THEN | ELSE | LB | RB | LP | RP | LSB | RSB-  | LESCAPE | RESCAPE | TO | PLUS | MINUS | TIMES | DIV | IDIV | MOD+  | TO | PLUS | MINUS | TIMES | DIV | IDIV | MOD   | TEQ | TNE | TLT | TLE | TGT | TGE | SEQ | SNE | SLT | SLE | SGT | SGE   | AND | OR | NOT | UNION | INTERSECT | EXCEPT | FOR | LET | IN | COMMA   | ASSIGN | WHERE | ORDER | BY | ASCENDING | DESCENDING | ELEMENT@@ -354,6 +379,7 @@ 	  show (TInteger n) = "Integer("++(show n)++")" 	  show (TFloat n) = "Double("++(show n)++")" 	  show (TString s) = "String("++s++")"+	  show (TError s) = "'"++s++"'"           show t = case filter (\(n,_) -> n==t) tokenList of                      (_,b):_ -> b                      _ -> "Illegal token"@@ -361,7 +387,7 @@  tokenList :: [(Token,String)] tokenList = [(RETURN,"return"),(SOME,"some"),(EVERY,"every"),(IF,"if"),(THEN,"then"),(ELSE,"else"),-             (LB,"["),(RB,"]"),(LP,"("),(RP,")"),(LSB,"{"),(RSB,"}"),(LESCAPE,"\"{"),(RESCAPE,"}\""),+             (LB,"["),(RB,"]"),(LP,"("),(RP,")"),(LSB,"{"),(RSB,"}"),              (TO,"to"),(PLUS,"+"),(MINUS,"-"),(TIMES,"*"),(DIV,"div"),(IDIV,"idiv"),(MOD,"mod"),              (TEQ,"="),(TNE,"!="),(TLT,"<"),(TLE,"<="),(TGT,">"),(TGE,">="),(PRE,"<<"),(POST,">>"),              (IS,"is"),(SEQ,"eq"),(SNE,"ne"),(SLT,"lt"),(SLE,"le"),(SGT,"gt"),(SGE,"ge"),(AND,"and"),@@ -373,50 +399,60 @@              (AT,"at"),(DOTS,".."),(DOT,"."),(SEMI,";")]  -parseError [] = error "Reached end-of-input"-parseError [_] = error "Reached end-of-input"-parseError tk = error("Parse error: "++(show (take 10 (init tk))))+parseError tk = error (case tk of+                         ((TError s):_) -> "Parse error: "++s+                         _ -> "Parse error: "++(foldr (\a r -> (show a)++" "++r) "" (take 20 tk)))   scan :: String -> [Token]-scan cs = lexer cs [0]+scan cs = lexer cs "" + xmlText :: String -> [Token] xmlText "" = [] xmlText text = [XMLtext text] + -- scans XML syntax and returns an XMLtext token with the text-xml :: String -> String -> [Int] -> [Token]-xml ('{':cs) text n = (xmlText text)++(LSB : lexer cs (0:n))-xml ('<':'/':cs) text n = (xmlText text)++(STAG : lexer cs n)+xml :: String -> String -> String -> [Token]+xml ('{':cs) text n = (xmlText text)++(LSB : lexer cs ('{':n))+xml ('<':'/':cs) text n = (xmlText text)++(STAG : lexer cs ('<':'/':n)) xml ('<':'!':'-':cs) text n = xmlComment cs (text++"<!-") n-xml ('<':cs) text (k:n) = (xmlText text)++(TLT : lexer cs (k+2:n))-xml ('\'':'{':cs) text n = (xmlText text)++(LESCAPE : lexer cs n)-xml ('\"':'{':cs) text n = (xmlText text)++(LESCAPE : lexer cs n)+xml ('<':cs) text n = (xmlText text)++(TLT : lexer cs ('<':n)) xml ('(':':':cs) text n = xqComment cs text n xml (c:cs) text n = xml cs (text++[c]) n xml [] text _ = xmlText text -xqComment :: String -> String -> [Int] -> [Token]++xqComment :: String -> String -> String -> [Token] xqComment (':':')':cs) text n = xml cs text n xqComment (_:cs) text n = xqComment cs text n xqComment [] text _ = xmlText text -xmlComment :: String -> String -> [Int] -> [Token]++xmlComment :: String -> String -> String -> [Token] xmlComment ('-':'>':cs) text n = xml cs (text++"->") n xmlComment (c:cs) text n = xmlComment cs (text++[c]) n xmlComment [] text _ = xmlText text + isQN :: Char -> Bool isQN c = elem c "_:-" || isDigit c || isAlpha c + isVar :: Char -> Bool isVar c = elem c "_" || isDigit c || isAlpha c ++inXML :: String -> Bool+inXML ('>':'<':_) = True+inXML _ = False++ -- the XQuery scanner-lexer :: String -> [Int] -> [Token]-lexer [] [0] = []-lexer [] _ = error "Unbalanced tags"+lexer :: String -> String -> [Token]+lexer [] "" = []+lexer [] _ = [ TError "Unexpected end of input" ] lexer (' ':'>':' ':cs) n = TGT : lexer cs n lexer (c:cs) n       | isSpace c = lexer cs n@@ -425,46 +461,50 @@ lexer ('$':c:cs) n | isAlpha c       = let (var,rest) = span isVar (c:cs)         in (Variable var) : lexer rest n-lexer ('\'':'{':cs) n = LESCAPE : lexer cs n-lexer ('\"':'{':cs) n = LESCAPE : lexer cs n lexer (':':'=':cs) n = ASSIGN : lexer cs n-lexer ('<':'/':cs) n = STAG : lexer cs n+lexer ('<':'/':cs) n = STAG : lexer cs ('<':'/':n) lexer ('<':'=':cs) n = TLE : lexer cs n lexer ('>':'=':cs) n = TGE : lexer cs n lexer ('<':'<':cs) n = PRE : lexer cs n lexer ('>':'>':cs) n = POST : lexer cs n-lexer ('/':'>':cs) (k:n) = ETAG : lexer cs (k-2:n)+lexer ('/':'>':cs) m = case m of+                         '<':n -> ETAG : (if inXML n then xml cs "" n else lexer cs n)+                         _ -> [ TError "Unexpected token: '/>'" ] lexer ('(':':':cs) n = lexComment cs n lexer ('<':'!':'-':cs) n = lexXmlComment cs "<!-" n lexer ('.':'.':cs) n = DOTS : lexer cs n lexer ('.':cs) n = DOT : lexer cs n-lexer ('}':'\'':cs) n = RESCAPE : lexer cs n-lexer ('}':'\"':cs) n = RESCAPE : lexer cs n lexer ('!':'=':cs) n = TNE : lexer cs n-lexer ('\'':cs) n = lexString cs n-lexer ('\"':cs) n = lexString2 cs n+lexer ('\'':cs) n = lexString cs "" ('\'':n)+lexer ('\"':cs) n = lexString cs "" ('\"': n) lexer ('[':cs) n = LB : lexer cs n lexer (']':cs) n = RB : lexer cs n lexer ('(':cs) n = LP : lexer cs n lexer (')':cs) n = RP : lexer cs n-lexer ('}':cs) [_,n] = RSB : lexer cs [n]-lexer ('}':cs) (_:n:ns) = RSB : (if n==0 then lexer cs (n:ns) else xml cs "" (n:ns))+lexer ('}':cs) m = case m of+                     '{':'\"':n -> RSB : lexString cs "" ('\"':n)+                     '{':'\'':n -> RSB : lexString cs "" ('\'':n)+                     '{':n -> RSB : (if inXML n then xml cs "" n else lexer cs n)+                     _ -> [ TError "Unexpected token: '}'" ] lexer ('+':cs) n = PLUS : lexer cs n lexer ('-':cs) n = MINUS : lexer cs n lexer ('*':cs) n = TIMES : lexer cs n lexer ('=':cs) n = TEQ : lexer cs n-lexer ('<':c:cs) n | not(isAlpha c) = TLT : lexer (c:cs) n-lexer ('<':cs) (k:n) = TLT : lexer cs (k+2:n)-lexer ('>':cs) (k:n) = TGT : (if k==1 then lexer cs (0:n) else xml cs "" (k-1:n))+lexer ('<':c:cs) n = TLT : (lexer (c:cs) (if isAlpha c then ('<':n) else n))+lexer ('>':cs) m = case m of+                     '<':'/':'>':'<':n -> TGT : (if inXML n then xml cs "" n else lexer cs n)+                     '<':n -> TGT : xml cs "" ('>':m) +                     _ -> TGT : lexer cs m lexer (',':cs) n = COMMA : lexer cs n lexer ('@':cs) n = ATSIGN : lexer cs n lexer ('/':cs) n = SLASH : lexer cs n-lexer ('{':cs) n = LSB : lexer cs (0:n)+lexer ('{':cs) n = LSB : lexer cs ('{':n) lexer ('|':cs) n = UNION : lexer cs n lexer (';':cs) n = SEMI : lexer cs n-lexer (c:cs) n = error("Illegal character "++[c])+lexer (c:cs) n = TError ("Illegal character: '"++[c,'\'']) : lexer cs n -lexNum :: String -> [Int] -> [Token]++lexNum :: String -> String -> [Token] lexNum cs n = if null rest || head rest /= '.'                  then TInteger (read k) : lexer rest n               else let (m,rest2) = span isDigit (tail rest)@@ -475,66 +515,73 @@                         _ -> (TFloat val) : lexer rest2 n       where (k,rest) = span isDigit cs -lexString :: String -> [Int] -> [Token]-lexString cs n = TString s : lexer (tail rest) n-    where (s,rest) = span inString cs-          inString c = c /= '\'' -lexString2 :: String -> [Int] -> [Token]-lexString2 cs n = TString s : lexer (tail rest) n-    where (s,rest) = span inString cs-          inString c = c /= '\"'+lexString :: String -> String -> String -> [Token]+lexString ('\"':cs) s m = case m of+                            '\"':n -> (TString s) : (lexer cs n)+                            _ -> lexString cs (s++"\"") m+lexString ('\'':cs) s m = case m of+                            '\'':n -> (TString s) : (lexer cs n)+                            _ -> lexString cs (s++"\'") m+lexString ('{':cs) s n = (TString s) : LSB : (lexer cs ('{':n))+lexString (c:cs) s n = lexString cs (s++[c]) n+lexString [] s n = [ TError "End of input while in string" ] -lexComment :: String -> [Int] -> [Token]++lexComment :: String -> String -> [Token] lexComment (':':')':cs) n = lexer cs n lexComment (_:cs) n = lexComment cs n-lexComment [] n = []+lexComment [] n = [ TError "End of input while in comment" ] -lexXmlComment :: String -> String -> [Int] -> [Token]++lexXmlComment :: String -> String -> String -> [Token] lexXmlComment ('-':'>':cs) text n = (xmlText (text++"->"))++(lexer cs n) lexXmlComment (c:cs) text n = lexXmlComment cs (text++[c]) n lexXmlComment [] text _ = xmlText text -lexVar :: String -> [Int] -> [Token]++lexVar :: String -> String -> [Token] lexVar cs n =-   case span isQN cs of-      ("return",rest) -> RETURN : lexer rest n-      ("some",rest) -> SOME : lexer rest n-      ("every",rest) -> EVERY : lexer rest n-      ("if",rest) -> IF : lexer rest n-      ("then",rest) -> THEN : lexer rest n-      ("else",rest) -> ELSE : lexer rest n-      ("to",rest) -> TO : lexer rest n-      ("div",rest) -> DIV : lexer rest n-      ("idiv",rest) -> IDIV : lexer rest n-      ("mod",rest) -> MOD : lexer rest n-      ("and",rest) -> AND : lexer rest n-      ("or",rest) -> OR : lexer rest n-      ("not",rest) -> NOT : lexer rest n-      ("union",rest) -> UNION : lexer rest n-      ("intersect",rest) -> INTERSECT : lexer rest n-      ("except",rest) -> EXCEPT : lexer rest n-      ("for",rest) -> FOR : lexer rest n-      ("let",rest) -> LET : lexer rest n-      ("in",rest) -> IN : lexer rest n-      ("where",rest) -> WHERE : lexer rest n-      ("order",rest) -> ORDER : lexer rest n-      ("by",rest) -> BY : lexer rest n-      ("ascending",rest) -> ASCENDING : lexer rest n-      ("descending",rest) -> DESCENDING : lexer rest n-      ("element",rest) -> ELEMENT : lexer rest n-      ("attribute",rest) -> ATTRIBUTE : lexer rest n-      ("satisfies",rest) -> SATISFIES : lexer rest n-      ("declare",rest) -> DECLARE : lexer rest n-      ("function",rest) -> FUNCTION : lexer rest n-      ("variable",rest) -> VARIABLE : lexer rest n-      ("at",rest) -> AT : lexer rest n-      ("eq",rest) -> SEQ : lexer rest n-      ("ne",rest) -> SNE : lexer rest n-      ("lt",rest) -> SLT : lexer rest n-      ("le",rest) -> SLE : lexer rest n-      ("gt",rest) -> SGT : lexer rest n-      ("ge",rest) -> SGE : lexer rest n-      ("is",rest) -> IS : lexer rest n-      (var,rest) -> QName var : lexer rest n+    let (nm,rest) = span isQN cs+    in (case nm of+          "return" -> RETURN+          "some" -> SOME+          "every" -> EVERY+          "if" -> IF+          "then" -> THEN+          "else" -> ELSE+          "to" -> TO+          "div" -> DIV+          "idiv" -> IDIV+          "mod" -> MOD+          "and" -> AND+          "or" -> OR+          "not" -> NOT+          "union" -> UNION+          "intersect" -> INTERSECT+          "except" -> EXCEPT+          "for" -> FOR+          "let" -> LET+          "in" -> IN+          "where" -> WHERE+          "order" -> ORDER+          "by" -> BY+          "ascending" -> ASCENDING+          "descending" -> DESCENDING+          "element" -> ELEMENT+          "attribute" -> ATTRIBUTE+          "satisfies" -> SATISFIES+          "declare" -> DECLARE+          "function" -> FUNCTION+          "variable" -> VARIABLE+          "at" -> AT+          "eq" -> SEQ+          "ne" -> SNE+          "lt" -> SLT+          "le" -> SLE+          "gt" -> SGT+          "ge" -> SGE+          "is" -> IS+          var -> QName var+       ) : lexer rest n }
data/q1.xq view
@@ -4,8 +4,8 @@  declare function f ( $name, $gpa ) {    <student>{ $name/firstname/text(),-              ' ',$name/lastname/text(),-              ': ',$gpa+              $name/lastname/text(),+              ':',$gpa    }</student> }; 
+ data/q3.xq view
@@ -0,0 +1,8 @@+<result>{+let $a := distinct-values(doc("data/cs.xml")//gradstudent)+for $s in $a+return <st>{+    doc("data/cs.xml")//gradstudent[.//lastname = $s//lastname]//name,+    count(.//*)+    }</st>+}</result>
hxml-0.2/XMLScanner.hs view
@@ -168,7 +168,8 @@ doEntityRef entities k r = doSpan (';'/=) (++) replacement (k . drop1) r where     replacement ename = case DTD.expandInternalEntity entities ename of 	    Just s 	-> s-	    _		-> error ("entity " ++ ename ++ " not defined")+-- changed by Leonidas Fegaras 5/27/08+	    _		-> "" -- error ("entity " ++ ename ++ " not defined")  -- [...] markupMode []	= []
index.html view
@@ -26,24 +26,26 @@ Also <a href="http://xqilla.sourceforge.net/HomePage">XQilla</a>, which is written in C++, took 1 minute and 10 secs (using 1150MB of heap space). (All results are taken on an Intel Core 2 Duo 2.2GHz 2GB running ghc-6.8.2 on Linux 2.6.23 kernel.) <p>-HXQ uses the <a href="http://www.flightlab.com/~joe/hxml/">HXML parser for XML</a> (developed by Joe English),-which is included in the source.-I have also tried hexpat, tagsoup, HXT, and HaXML Xtract, but they all have space leaks.-For example, when I replaced the HXML parser with <a href="http://www-users.cs.york.ac.uk/~ndm/tagsoup/">tagsoup</a>-in HXQ, it required more than 3GB heap space for the above query-and gave partial results.+Finally, HXQ can store XML documents in a relational database (currently SQLite), by shredding XML into relational+tuples, and by translating XQueries over the shredded documents into optimized SQL queries. <p> <h2>Installation Instructions</h2> <p> First, you need to install the Glasgow Haskell Compiler, <a href="http://www.haskell.org/ghc/">ghc</a>,-and the parser generator for Haskell,-<a href="http://www.haskell.org/happy/">happy</a>.-For example, in Fedora Linux, you install both using:+the parser generator for Haskell,+<a href="http://www.haskell.org/happy/">happy</a>,+and <a href="http://sqlite.org/">SQLite</a> for database connectivity (optional).+For example, in Fedora Linux, you install them using: <pre>-yum install ghc happy+yum install ghc happy sqlite </pre>-Then download <a href="/HXQ-0.8.tar.gz">HXQ</a> and untar it.+Then, you need to install the haskell packages: <a href="http://hackage.haskell.org/cgi-bin/hackage-scripts/package/HDBC">HDBC</a>+and the+<a href="http://hackage.haskell.org/cgi-bin/hackage-scripts/package/HDBC-sqlite3">HDBC-sqlite3</a> driver+to connect to SQLite relational databases.+<p>+Finally, download <a href="/HXQ-0.8.3.tar.gz">HXQ</a> and untar it. You can use either make or cabal to build it. To build it with cabal, you do: <pre> runhaskell Setup.lhs configure --prefix=$HOME@@ -51,7 +53,7 @@ runhaskell Setup.lhs install </pre> (The last command must be run as root.)-It will create the executable <tt>xquery</tt>, which is the XQuery interepreter, and the HXQ library.+It will create the executable <tt>xquery</tt>, which is the XQuery interpreter, and the HXQ library. To use the library, you run ghc or ghci with <tt>-package HXQ</tt>. <p> <h2>Current Status</h2>@@ -64,9 +66,12 @@ Some, but not all, parent axis steps are removed using optimization rules; all others cause a compilation error. Finally, the XQuery semantics requires duplicate elimination and sorting by document order for every XPath step, which is very expensive and unnecessary in most cases.-For exmple, <tt>e//*//*</tt> may return duplicate elements in HXQ.+For example, <tt>e//*//*</tt> may return duplicate elements in HXQ. This will be addressed in the future (needs a static analysis to determine when duplicate elimination is necessary). <p>+HXQ uses the <a href="http://www.flightlab.com/~joe/hxml/">HXML parser for XML</a> (developed by Joe English),+which is included in the source. I have also tried hexpat, tagsoup, HXT, and HaXML Xtract, but they all have space leaks.+<p> <h2>Using the Compiler</h2> <p> The main functions for embedding XQueries in Haskell are:@@ -131,16 +136,34 @@ <tt>xquery -p "//inproceedings[100]" data/dblp.xml</tt>. With <tt>xquery -help</tt> you get the list of system functions and usage information.  <p>-<h2>Experimental Features</h2>+<h2>Database Connectivity</h2> <p>-There is an experimental interface to HDBC to query relational data inside an XQuery.-To use it, you need to install <a href="http://hackage.haskell.org/cgi-bin/hackage-scripts/package/HDBC">HDBC</a>-and <a href="http://hackage.haskell.org/cgi-bin/hackage-scripts/package/HDBC-sqlite3">HDBC-sqlite3</a>-(or some other HDBC driver, such ODBC). The main function is-<tt>$(xqdb query) :: (IConnection conn) => conn -> IO XSeq</tt>.-The XQuery may contain multiple SQL queries in the form <tt>sql(query,args)</tt>,-where <tt>query</tt> is the sql query that may contain parameters (denoted by ?), which are bound to the values in <tt>args</tt>.-An example can be found in <a href="TestDB.hs">TestDB.hs</a>. To run it, you need+HXQ provides an interface to HDBC to query relational data inside an XQuery.+For the HXQ compiler, the main function that allows database connectivity is:+<pre>+$(xqdb query) :: (IConnection conn) => conn -> IO XSeq+</pre>+For example, if the database name is "myDB", then+<pre>+do db <- connect "myDB"+   result <- $(xqdb xquery) db+</pre>+For the HXQ interpreter, the function is:+<pre>+xqueryDB :: (IConnection conn) => String -> conn -> IO XSeq+</pre>+The xquery executable can also run xqueries that use a database by specifying the database name using the -db option.+<p>+Currently, HXQ works with <a href="http://sqlite.org/">SQLite</a> only, but is very easy to make it work+with any relational database that supports ODBC: simply install +<a href="http://hackage.haskell.org/cgi-bin/hackage-scripts/package/HDBC-odbc">HDBC-odbc</a>+and change the file <a href="XML/HXQ/DBConnect.hs">XML/HXQ/DBConnect.hs</a> accordingly.+<p>+<h3>Querying an Existing Database</h3>+<p>+An XQuery may contain multiple SQL queries in the form <tt>sql(query,args)</tt>,+where <tt>query</tt> is the sql query that may contain parameters (denoted by ?), which are bound to the values in <tt>args</tt> (an XSeq).+An example can be found in <a href="TestDB.hs">TestDB.hs</a>. To run this example, you need to install the <a href="data/company.sql">company</a> database. For example, using the sqlite3 interpreter, you do: <pre>@@ -148,17 +171,52 @@ .read data/company.sql .quit </pre>-and then you do <tt>make testdb</tt> on linux.+and then compile and run <tt>TestDB.hs</tt> (or just do <tt>make test3</tt> on linux). <p>-Finally, there is an experimental+<h3>Shredding</h3>+<p>+To store an XML document into a relational database, use the following Haskell function:+<pre>+shred :: (IConnection conn) => conn -> String -> String -> IO ()+shred db file name+</pre>+that shreds and stores the XML document located at the file pathname in the database db under a unique name.+HXQ will find a good relational schema (using hybrid inlining) to store the XML data by first scanning the document to+extract its structural summary, then deriving a good relational schema, and finally scanning the document+for a second time to store its data into the relational tables. For example,+<pre>+do db <- connect "myDB"+   shred db "data/cs.xml" "c"+</pre>+<p>+The haskell function+<pre>+createIndex db name tagname+</pre>+creates a secondary index on tagname for the shredded document under the given name.+<p>+<h3>Publishing</h3>+<p>+You can query a shredded XML document using the XQuery function:+<pre>+publish(dbame,name)+</pre>+where dbname is the database file name and name is the unique name assigned to the XML document when was shredded.+The translation from XQuery to SQL is done at compile-time, so both dbname and name must be constant strings.+HXQ will do its best to push relevant predicates to the generated SQL query (using partial evaluation and code folding),+thus deriving an efficient execution. One example is <a href="TestDB2.hs">TestDB2.hs</a> (do <tt>make test4</tt> to run it on linux).+<p>+<h2>Experimental Features</h2>+<p>+There is an experimental program, called <tt>hxqc</tt>, that works like <tt>xquery</tt> but is faster because it uses the-HXQ compiler instead of the interpreter. It's constracted with the Unix Makefile (<tt>make hxqc</tt>).+HXQ compiler instead of the interpreter. It's constructed with the Unix Makefile (<tt>make hxqc</tt>). It is unstable and the <tt>hxqc</tt> executable is 10 times larger than <tt>xquery</tt> since it uses the ghc libraries at run-time. Also, although it is faster than the interpreter, it is slower than a-compiled xquery since it uses part of the heap for the ghc compiler to compile Haskell code on-the-fly.+compiled xquery because it uses part of the heap for the ghc compiler to compile Haskell code on-the-fly. <p> </body> <p> <hr> <p>-<address>Last modified: 05/13/08 by <a href="http://lambda.uta.edu/">Leonidas Fegaras</a></address>+<address>Last modified: 06/12/08 by <a href="http://lambda.uta.edu/">Leonidas Fegaras</a></address>
− profile.hs
@@ -1,20 +0,0 @@-{-# OPTIONS_GHC -fth #-}--module Main where--import XML.HXQ.XTree-import XML.HXQ.Parser-import XML.HXQ.Compiler-import XMLParse(parseDocument)-import IO--main = do let [XText f_0] = [XText "data/dblp.xml"]-          doc_1 <- readFile f_0-          res <- (\_doc0 -> return (foldr (\x_2 -> (\x -> \r_3 -> foldir (\x_4 i_5 r_6 -> if case [trueXT | x_7 <- text (foldr (\a_8 s_9 -> child_step "author" a_8 ++ s_9) [] (x :: XSeq)),-                                                                                                                                              y_10 <- text [XText "David Maier"],-                                                                                                                                              compareXTrees x_7 y_10 == EQ] of-                                                                                                                    [XInt k_11] -> k_11 == i_5-                                                                                                                    b_12 -> conditionTest b_12-                                                                                                              then x_4 : r_6-                                                                                                              else r_6) [] [XElem "paper" [] 0 ((text (foldr (\a_13 s_14 -> child_step "booktitle" a_13 ++ s_14) [] (x :: XSeq)) ++ [XText ": "]) ++ text (foldr (\a_15 s_16 -> child_step "title" a_15 ++ s_16) [] (x :: XSeq)))] 1 ++ r_3) [x_2]) [] (foldr (\a_17 s_18 -> descendant_step "inproceedings" a_17 ++ s_18) [] [_doc0]))) (materialize (parseDocument doc_1))-          putXSeq res