idris-0.9.5: src/Idris/Parser.hs
{-# LANGUAGE PatternGuards #-}
module Idris.Parser where
import Idris.AbsSyntax
import Idris.DSL
import Idris.Imports
import Idris.Error
import Idris.ElabDecls
import Idris.ElabTerm
import Idris.Coverage
import Idris.IBC
import Idris.Unlit
import Paths_idris
import Core.CoreParser
import Core.TT
import Core.Evaluate
import Text.Parsec
import Text.Parsec.Error
import Text.Parsec.Expr
import Text.Parsec.Language
import Text.Parsec.String
import qualified Text.Parsec.Token as PTok
import Data.List
import Control.Monad.State
import Debug.Trace
import Data.Maybe
import System.FilePath
type TokenParser a = PTok.TokenParser a
type IParser = GenParser Char IState
lexer :: TokenParser IState
lexer = PTok.makeTokenParser idrisDef
whiteSpace = PTok.whiteSpace lexer
lexeme = PTok.lexeme lexer
symbol = PTok.symbol lexer
natural = PTok.natural lexer
parens = PTok.parens lexer
semi = PTok.semi lexer
comma = PTok.comma lexer
identifier = PTok.identifier lexer
reserved = PTok.reserved lexer
operator = PTok.operator lexer
reservedOp = PTok.reservedOp lexer
integer = PTok.integer lexer
float = PTok.float lexer
strlit = PTok.stringLiteral lexer
chlit = PTok.charLiteral lexer
lchar = lexeme.char
-- Loading modules
loadModule :: FilePath -> Idris String
loadModule f
= idrisCatch (do i <- getIState
ibcsd <- valIBCSubDir i
ids <- allImportDirs i
fp <- liftIO $ findImport ids ibcsd f
if f `elem` imported i
then iLOG $ "Already read " ++ f
else do putIState (i { imported = f : imported i })
case fp of
IDR fn -> loadSource False fn
LIDR fn -> loadSource True fn
IBC fn src ->
idrisCatch (loadIBC fn)
(\c -> do iLOG $ fn ++ " failed " ++ show c
case src of
IDR sfn -> loadSource False sfn
LIDR sfn -> loadSource True sfn)
let (dir, fh) = splitFileName f
return (dropExtension fh))
(\e -> do let msg = show e
setErrLine (getErrLine msg)
iputStrLn msg
return "")
loadSource :: Bool -> FilePath -> Idris ()
loadSource lidr f
= do iLOG ("Reading " ++ f)
i <- getIState
let def_total = default_total i
file_in <- liftIO $ readFile f
file <- if lidr then tclift $ unlit f file_in else return file_in
(mname, modules, rest, pos) <- parseImports f file
i <- getIState
putIState (i { default_access = Hidden })
mapM_ loadModule modules
clearIBC -- start a new .ibc file
mapM_ (addIBC . IBCImport) modules
ds' <- parseProg (defaultSyntax {syn_namespace = reverse mname })
f rest pos
let ds = namespaces mname ds'
logLvl 3 (dumpDecls ds)
i <- getIState
logLvl 10 (show (toAlist (idris_implicits i)))
logLvl 3 (show (idris_infixes i))
-- Now add all the declarations to the context
v <- verbose
when v $ iputStrLn $ "Type checking " ++ f
mapM_ (elabDecl toplevel) ds
i <- get
-- simplify every definition do give the totality checker
-- a better chance
mapM_ (\n -> do logLvl 5 $ "Simplifying " ++ show n
updateContext (simplifyCasedef n))
(map snd (idris_totcheck i))
-- build size change graph from simplified definitions
iLOG "Totality checking"
i <- get
-- mapM_ buildSCG (idris_totcheck i)
mapM_ checkDeclTotality (idris_totcheck i)
iLOG ("Finished " ++ f)
ibcsd <- valIBCSubDir i
let ibc = ibcPathNoFallback ibcsd f
iLOG "Universe checking"
iucheck
i <- getIState
addHides (hide_list i)
ok <- noErrors
when ok $
idrisCatch (do writeIBC f ibc; clearIBC)
(\c -> return ()) -- failure is harmless
i <- getIState
putIState (i { default_total = def_total,
hide_list = [] })
return ()
where
namespaces [] ds = ds
namespaces (x:xs) ds = [PNamespace x (namespaces xs ds)]
addHides :: [(Name, Maybe Accessibility)] -> Idris ()
addHides xs = do i <- getIState
let defh = default_access i
let (hs, as) = partition isNothing xs
unless (null as) $
mapM_ doHide
(map (\ (n, _) -> (n, defh)) hs ++
map (\ (n, Just a) -> (n, a)) as)
where isNothing (_, Nothing) = True
isNothing _ = False
doHide (n, a) = do setAccessibility n a
addIBC (IBCAccess n a)
parseExpr i = runParser (pFullExpr defaultSyntax) i "(input)"
parseTac i = runParser (do t <- pTactic defaultSyntax
eof
return t) i "(proof)"
iShowError fname err = let ln = sourceLine (errorPos err)
clm = sourceColumn (errorPos err)
msg = map messageString (errorMessages err) in
fname ++ ":" ++ show ln ++ ":parse error"
++ " at column " ++ show clm -- ++ " with error:\n\t" ++ show msg
parseImports :: FilePath -> String -> Idris ([String], [String], String, SourcePos)
parseImports fname input
= do i <- get
case runParser (do whiteSpace
mname <- pHeader
ps <- many pImport
rest <- getInput
pos <- getPosition
return ((mname, ps, rest, pos), i)) i fname input of
Left err -> fail (iShowError fname err)
Right (x, i) -> do put i
return x
pHeader :: IParser [String]
pHeader = try (do reserved "module"; i <- identifier; option ';' (lchar ';')
return (parseName i))
<|> return []
where parseName x = case span (/='.') x of
(x, "") -> [x]
(x, '.':y) -> x : parseName y
pushIndent :: IParser ()
pushIndent = do pos <- getPosition
ist <- getState
setState (ist { indent_stack = sourceColumn pos :
indent_stack ist })
lastIndent :: IParser Int
lastIndent = do ist <- getState
case indent_stack ist of
(x : xs) -> return x
_ -> return 1
indent :: IParser Int
indent = liftM sourceColumn getPosition
popIndent :: IParser ()
popIndent = do ist <- getState
let (x : xs) = indent_stack ist
setState (ist { indent_stack = xs })
openBlock :: IParser ()
openBlock = do lchar '{'
ist <- getState
setState (ist { brace_stack = Nothing : brace_stack ist })
<|> do ist <- getState
lvl <- indent
setState (ist { brace_stack = Just lvl : brace_stack ist })
closeBlock :: IParser ()
closeBlock = do ist <- getState
bs <- case brace_stack ist of
Nothing : xs -> do lchar '}'
return xs
Just lvl : xs -> do i <- indent
inp <- getInput
-- trace (show (take 10 inp, i, lvl)) $
if i >= lvl && take 1 inp /= ")"
then fail "Not end of block"
else return xs
setState (ist { brace_stack = bs })
pTerminator = do lchar ';'; popIndent
<|> do c <- indent; l <- lastIndent
if c <= l
then popIndent
else fail "Not a terminator"
<|> do i <- getInput
if "}" `isPrefixOf` i || ")" `isPrefixOf` i
then popIndent
else fail "Not a terminator"
<|> lookAhead eof
pBarTerminator
= do lchar '|'; return ()
<|> do c <- indent; l <- lastIndent
unless (c <= l) $ fail "Not a terminator"
<|> lookAhead eof
pKeepTerminator
= do lchar ';'; return ()
<|> do c <- indent; l <- lastIndent
unless (c <= l) $ fail "Not a terminator"
<|> do i <- getInput
let h = take 1 i
unless (h `elem` ["}", ")", "|"]) $ fail "Not a terminator"
<|> lookAhead eof
notEndApp = do c <- indent; l <- lastIndent
i <- getInput
when (c <= l) $ fail "Terminator"
notEndBlock = do ist <- getState
case brace_stack ist of
Just lvl : xs -> do i <- indent
inp <- getInput
when (i < lvl || ")" `isPrefixOf` inp) $ fail "End of block"
_ -> return ()
pfc :: IParser FC
pfc = do s <- getPosition
let (dir, file) = splitFileName (sourceName s)
let f = case dir of
"./" -> file
_ -> sourceName s
return $ FC f (sourceLine s)
pImport :: IParser String
pImport = do reserved "import"; f <- identifier; option ';' (lchar ';')
return (map dot f)
where dot '.' = '/'
dot c = c
parseProg :: SyntaxInfo -> FilePath -> String -> SourcePos -> Idris [PDecl]
parseProg syn fname input pos
= do i <- get
case runParser (do setPosition pos
whiteSpace
ps <- many (pDecl syn)
eof
i' <- getState
return (concat ps, i')) i fname input of
Left err -> fail (iShowError fname err)
Right (x, i) -> do put i
return (collect x)
-- Collect PClauses with the same function name
collect :: [PDecl] -> [PDecl]
collect (c@(PClauses _ o _ _) : ds)
= clauses (cname c) [] (c : ds)
where clauses j@(Just n) acc (PClauses fc _ _ [PClause fc' n' l ws r w] : ds)
| n == n' = clauses j (PClause fc' n' l ws r (collect w) : acc) ds
clauses j@(Just n) acc (PClauses fc _ _ [PWith fc' n' l ws r w] : ds)
| n == n' = clauses j (PWith fc' n' l ws r (collect w) : acc) ds
clauses (Just n) acc xs = PClauses (getfc c) o n (reverse acc) : collect xs
clauses Nothing acc (x:xs) = collect xs
clauses Nothing acc [] = []
cname (PClauses fc _ _ [PClause _ n _ _ _ _]) = Just n
cname (PClauses fc _ _ [PWith _ n _ _ _ _]) = Just n
cname (PClauses fc _ _ [PClauseR _ _ _ _]) = Nothing
cname (PClauses fc _ _ [PWithR _ _ _ _]) = Nothing
getfc (PClauses fc _ _ _) = fc
collect (PParams f ns ps : ds) = PParams f ns (collect ps) : collect ds
collect (PNamespace ns ps : ds) = PNamespace ns (collect ps) : collect ds
collect (PClass f s cs n ps ds : ds') = PClass f s cs n ps (collect ds) : collect ds'
collect (PInstance f s cs n ps t en ds : ds')
= PInstance f s cs n ps t en (collect ds) : collect ds'
collect (d : ds) = d : collect ds
collect [] = []
pFullExpr :: SyntaxInfo -> IParser PTerm
pFullExpr syn
= do x <- pExpr syn; eof;
i <- getState
return $ desugar syn i x
pDecl :: SyntaxInfo -> IParser [PDecl]
pDecl syn = do notEndBlock
pDeclBody where
pDeclBody
= do d <- pDecl' syn
i <- getState
let d' = fmap (desugar syn i) d
return [d']
<|> pUsing syn
<|> pParams syn
<|> pNamespace syn
<|> pClass syn
<|> pInstance syn
<|> do d <- pDSL syn; return [d]
<|> pDirective
<|> try (do reserved "import"; fp <- identifier
fail "imports must be at the top of file")
pFunDecl :: SyntaxInfo -> IParser [PDecl]
pFunDecl syn
= try (do notEndBlock
d <- pFunDecl' syn
i <- getState
let d' = fmap (desugar syn i) d
return [d'])
--------- Top Level Declarations ---------
pDecl' :: SyntaxInfo -> IParser PDecl
pDecl' syn
= try pFixity
<|> pFunDecl' syn
<|> try (pData syn)
<|> try (pRecord syn)
<|> pSyntaxDecl syn
pSyntaxDecl :: SyntaxInfo -> IParser PDecl
pSyntaxDecl syn
= do s <- pSyntaxRule syn
i <- getState
let rs = syntax_rules i
let ns = syntax_keywords i
let ibc = ibc_write i
let ks = map show (names s)
setState (i { syntax_rules = s : rs,
syntax_keywords = ks ++ ns,
ibc_write = IBCSyntax s : map IBCKeyword ks ++ ibc
})
fc <- pfc
return (PSyntax fc s)
where
names (Rule syms _ _) = mapMaybe ename syms
ename (Keyword n) = Just n
ename _ = Nothing
pSyntaxRule :: SyntaxInfo -> IParser Syntax
pSyntaxRule syn
= do pushIndent
sty <- option AnySyntax (do reserved "term"; return TermSyntax
<|> do reserved "pattern"; return PatternSyntax)
reserved "syntax"
syms <- many1 pSynSym
when (all expr syms) $ fail "No keywords in syntax rule"
let ns = mapMaybe name syms
when (length ns /= length (nub ns))
$ fail "Repeated variable in syntax rule"
lchar '='
tm <- pExpr (impOK syn)
pTerminator
return (Rule (mkSimple syms) tm sty)
where
expr (Expr _) = True
expr _ = False
name (Expr n) = Just n
name _ = Nothing
-- Can't parse two full expressions (i.e. expressions with application) in a row
-- so change the first to a simple expression
mkSimple (Expr e : es) = SimpleExpr e : mkSimple' es
mkSimple xs = mkSimple' xs
mkSimple' (Expr e : Expr e1 : es) = SimpleExpr e : mkSimple' (Expr e1 : es)
mkSimple' (e : es) = e : mkSimple' es
mkSimple' [] = []
pSynSym :: IParser SSymbol
pSynSym = try (do lchar '['; n <- pName; lchar ']'
return (Expr n))
<|> try (do lchar '{'; n <- pName; lchar '}'
return (Binding n))
<|> do n <- iName []
return (Keyword n)
<|> do sym <- strlit
return (Symbol sym)
pFunDecl' :: SyntaxInfo -> IParser PDecl
pFunDecl' syn = try (do pushIndent
ist <- getState
let initOpts = if default_total ist
then [TotalFn]
else []
opts <- pFnOpts initOpts
acc <- pAccessibility
opts' <- pFnOpts opts
n_in <- pfName
let n = expandNS syn n_in
ty <- pTSig (impOK syn)
fc <- pfc
pTerminator
-- ty' <- implicit syn n ty
addAcc n acc
return (PTy syn fc opts' n ty))
<|> try (pPattern syn)
<|> try (pCAF syn)
pUsing :: SyntaxInfo -> IParser [PDecl]
pUsing syn =
do reserved "using"; lchar '('; ns <- tyDeclList syn; lchar ')'
openBlock
let uvars = using syn
ds <- many1 (pDecl (syn { using = uvars ++ ns }))
closeBlock
return (concat ds)
pParams :: SyntaxInfo -> IParser [PDecl]
pParams syn =
do reserved "parameters"; lchar '('; ns <- tyDeclList syn; lchar ')'
openBlock
let pvars = syn_params syn
ds <- many1 (pDecl syn { syn_params = pvars ++ ns })
closeBlock
fc <- pfc
return [PParams fc ns (concat ds)]
pNamespace :: SyntaxInfo -> IParser [PDecl]
pNamespace syn =
do reserved "namespace"; n <- identifier;
openBlock
ds <- many1 (pDecl syn { syn_namespace = n : syn_namespace syn })
closeBlock
return [PNamespace n (concat ds)]
--------- Fixity ---------
pFixity :: IParser PDecl
pFixity = do pushIndent
f <- fixity; i <- natural; ops <- sepBy1 operator (lchar ',')
pTerminator
let prec = fromInteger i
istate <- getState
let fs = map (Fix (f prec)) ops
setState (istate {
idris_infixes = nub $ sort (fs ++ idris_infixes istate),
ibc_write = map IBCFix fs ++ ibc_write istate })
fc <- pfc
return (PFix fc (f prec) ops)
fixity :: IParser (Int -> Fixity)
fixity = try (do reserved "infixl"; return Infixl)
<|> try (do reserved "infixr"; return Infixr)
<|> try (do reserved "infix"; return InfixN)
<|> try (do reserved "prefix"; return PrefixN)
--------- Type classes ---------
pClass :: SyntaxInfo -> IParser [PDecl]
pClass syn = do acc <- pAccessibility
reserved "class"; fc <- pfc; cons <- pConstList syn; n_in <- pName
let n = expandNS syn n_in
cs <- many1 carg
reserved "where"; openBlock
ds <- many $ pFunDecl syn
closeBlock
let allDs = concat ds
accData acc n (concatMap declared allDs)
return [PClass syn fc cons n cs allDs]
where
carg = do lchar '('; i <- pName; lchar ':'; ty <- pExpr syn; lchar ')'
return (i, ty)
<|> do i <- pName;
return (i, PSet)
pInstance :: SyntaxInfo -> IParser [PDecl]
pInstance syn = do reserved "instance"; fc <- pfc
en <- option Nothing
(do lchar '['; n_in <- pfName; lchar ']'
let n = expandNS syn n_in
return (Just n))
cs <- pConstList syn
cn <- pName
args <- many1 (pSimpleExpr syn)
let sc = PApp fc (PRef fc cn) (map pexp args)
let t = bindList (PPi constraint) (map (\x -> (MN 0 "c", x)) cs) sc
reserved "where"; openBlock
ds <- many $ pFunDecl syn
closeBlock
return [PInstance syn fc cs cn args t en (concat ds)]
--------- Expressions ---------
pExpr syn = do i <- getState
buildExpressionParser (table (idris_infixes i)) (pExpr' syn)
pExpr' :: SyntaxInfo -> IParser PTerm
pExpr' syn
= try (pExtExpr syn)
<|> pNoExtExpr syn
pExtExpr :: SyntaxInfo -> IParser PTerm
pExtExpr syn = do i <- getState
pExtensions syn (syntax_rules i)
pSimpleExtExpr :: SyntaxInfo -> IParser PTerm
pSimpleExtExpr syn = do i <- getState
pExtensions syn (filter simple (syntax_rules i))
where
simple (Rule (Expr x:xs) _ _) = False
simple (Rule (SimpleExpr x:xs) _ _) = False
simple (Rule [Keyword _] _ _) = True
simple (Rule [Symbol _] _ _) = True
simple (Rule (_:xs) _ _) = case last xs of
Keyword _ -> True
Symbol _ -> True
_ -> False
simple _ = False
pNoExtExpr syn =
try (pApp syn)
<|> pRecordSet syn
<|> try (pSimpleExpr syn)
<|> pLambda syn
<|> pLet syn
<|> pPi syn
<|> pDoBlock syn
<|> pComprehension syn
pExtensions :: SyntaxInfo -> [Syntax] -> IParser PTerm
pExtensions syn rules = choice (map (try . pExt syn) (filter valid rules))
where
valid (Rule _ _ AnySyntax) = True
valid (Rule _ _ PatternSyntax) = inPattern syn
valid (Rule _ _ TermSyntax) = not (inPattern syn)
data SynMatch = SynTm PTerm | SynBind Name
pExt :: SyntaxInfo -> Syntax -> IParser PTerm
pExt syn (Rule ssym ptm _)
= do smap <- mapM pSymbol ssym
let ns = mapMaybe id smap
return (update ns ptm) -- updated with smap
where
pSymbol (Keyword n) = do reserved (show n); return Nothing
pSymbol (Expr n) = do tm <- pExpr syn
return $ Just (n, SynTm tm)
pSymbol (SimpleExpr n) = do tm <- pSimpleExpr syn
return $ Just (n, SynTm tm)
pSymbol (Binding n) = do b <- pName
return $ Just (n, SynBind b)
pSymbol (Symbol s) = do symbol s
return Nothing
dropn n [] = []
dropn n ((x,t) : xs) | n == x = xs
| otherwise = (x,t):dropn n xs
updateB ns n = case lookup n ns of
Just (SynBind t) -> t
_ -> n
update ns (PRef fc n) = case lookup n ns of
Just (SynTm t) -> t
_ -> PRef fc n
update ns (PLam n ty sc) = PLam (updateB ns n) (update ns ty) (update (dropn n ns) sc)
update ns (PPi p n ty sc) = PPi p (updateB ns n) (update ns ty) (update (dropn n ns) sc)
update ns (PLet n ty val sc) = PLet (updateB ns n) (update ns ty) (update ns val)
(update (dropn n ns) sc)
update ns (PApp fc t args) = PApp fc (update ns t) (map (fmap (update ns)) args)
update ns (PCase fc c opts) = PCase fc (update ns c) (map (pmap (update ns)) opts)
update ns (PPair fc l r) = PPair fc (update ns l) (update ns r)
update ns (PDPair fc l t r) = PDPair fc (update ns l) (update ns t) (update ns r)
update ns (PAlternative a as) = PAlternative a (map (update ns) as)
update ns (PHidden t) = PHidden (update ns t)
update ns (PDoBlock ds) = PDoBlock $ upd ns ds
where upd ns (DoExp fc t : ds) = DoExp fc (update ns t) : upd ns ds
upd ns (DoBind fc n t : ds) = DoBind fc n (update ns t) : upd (dropn n ns) ds
upd ns (DoLet fc n ty t : ds) = DoLet fc n (update ns ty) (update ns t)
: upd (dropn n ns) ds
upd ns (DoBindP fc i t : ds) = DoBindP fc (update ns i) (update ns t)
: upd ns ds
upd ns (DoLetP fc i t : ds) = DoLetP fc (update ns i) (update ns t)
: upd ns ds
update ns t = t
pName = do i <- getState
iName (syntax_keywords i)
<|> do reserved "instance"
i <- getState
UN n <- iName (syntax_keywords i)
return (UN ('@':n))
-- Parser for an operator in function position, i.e. enclosed by `()', with an
-- optional namespace.
pOpFront = maybeWithNS pOpFrontNoNS False []
where pOpFrontNoNS = do lchar '('; o <- operator; lchar ')'; return o
pfName = try pOpFront
<|> pName
pTotality :: IParser Bool
pTotality
= do reserved "total"; return True
<|> do reserved "partial"; return False
pAccessibility' :: IParser Accessibility
pAccessibility'
= do reserved "public"; return Public
<|> do reserved "abstract"; return Frozen
<|> do reserved "private"; return Hidden
pAccessibility :: IParser (Maybe Accessibility)
pAccessibility
= do acc <- pAccessibility'; return (Just acc)
<|> return Nothing
pFnOpts :: [FnOpt] -> IParser [FnOpt]
pFnOpts opts
= do reserved "total"; pFnOpts (TotalFn : opts)
<|> do reserved "partial"; pFnOpts (PartialFn : (opts \\ [TotalFn]))
<|> try (do lchar '%'; reserved "export"; c <- strlit;
pFnOpts (CExport c : opts))
<|> do lchar '%'; reserved "assert_total"; pFnOpts (AssertTotal : opts)
<|> do lchar '%'; reserved "specialise";
lchar '['; ns <- sepBy pfName (lchar ','); lchar ']'
pFnOpts (Specialise ns : opts)
<|> return opts
addAcc :: Name -> Maybe Accessibility -> IParser ()
addAcc n a = do i <- getState
setState (i { hide_list = (n, a) : hide_list i })
pCaseExpr syn = do
reserved "case"; fc <- pfc; scr <- pExpr syn; reserved "of";
openBlock
pushIndent
opts <- many1 (do notEndBlock
x <- pCaseOpt syn
pKeepTerminator
return x) -- sepBy1 (pCaseOpt syn) (lchar '|')
popIndent
closeBlock
return (PCase fc scr opts)
pProofExpr syn = do
reserved "proof"; lchar '{'
ts <- endBy (pTactic syn) (lchar ';')
lchar '}'
return (PProof ts)
pTacticsExpr syn = do
reserved "tactics"; lchar '{'
ts <- endBy (pTactic syn) (lchar ';')
lchar '}'
return (PTactics ts)
pSimpleExpr syn =
try (do symbol "!["; t <- pTerm; lchar ']'; return $ PQuote t)
<|> do lchar '?'; x <- pName; return (PMetavar x)
<|> do reserved "refl"; fc <- pfc;
tm <- option Placeholder (do lchar '{'; t <- pExpr syn; lchar '}';
return t)
return (PRefl fc tm)
-- <|> do reserved "return"; fc <- pfc; return (PReturn fc)
<|> pProofExpr syn
<|> pTacticsExpr syn
<|> pCaseExpr syn
<|> try (do x <- pfName
fc <- pfc
return (PRef fc x))
<|> try (pList syn)
<|> try (pAlt syn)
<|> try (pIdiom syn)
<|> try (do lchar '('
bracketed (noImp syn))
<|> try (do c <- pConstant
fc <- pfc
return (modifyConst syn fc (PConstant c)))
<|> do reserved "Set"; return PSet
<|> try (do symbol "()"
fc <- pfc
return (PTrue fc))
<|> try (do symbol "_|_"
fc <- pfc
return (PFalse fc))
<|> do lchar '_'; return Placeholder
<|> pSimpleExtExpr syn
bracketed syn =
try (pPair syn)
<|> try (do e <- pExpr syn; lchar ')'; return e)
-- <|> try (do reserved "typed"
-- e <- pExpr syn; symbol ":"; t <- pExpr syn; lchar ')'
-- return (PTyped e t))
<|> try (do fc <- pfc; o <- operator; e <- pExpr syn; lchar ')'
return $ PLam (MN 1000 "ARG") Placeholder
(PApp fc (PRef fc (UN o)) [pexp (PRef fc (MN 1000 "ARG")),
pexp e]))
<|> try (do fc <- pfc; e <- pSimpleExpr syn; o <- operator; lchar ')'
return $ PLam (MN 1000 "ARG") Placeholder
(PApp fc (PRef fc (UN o)) [pexp e,
pexp (PRef fc (MN 1000 "ARG"))]))
pCaseOpt :: SyntaxInfo -> IParser (PTerm, PTerm)
pCaseOpt syn = do lhs <- pExpr syn; symbol "=>"; rhs <- pExpr syn
return (lhs, rhs)
modifyConst :: SyntaxInfo -> FC -> PTerm -> PTerm
modifyConst syn fc (PConstant (I x))
| not (inPattern syn)
= PApp fc (PRef fc (UN "fromInteger")) [pexp (PConstant (I x))]
| otherwise = PConstant (I x)
modifyConst syn fc x = x
pList syn = do lchar '['; fc <- pfc; xs <- sepBy (pExpr syn) (lchar ','); lchar ']'
return (mkList fc xs)
where
mkList fc [] = PRef fc (UN "Nil")
mkList fc (x : xs) = PApp fc (PRef fc (UN "::")) [pexp x, pexp (mkList fc xs)]
pPair syn = try (do l <- pExpr syn
fc <- pfc
rest <- restTuple
case rest of
[] -> return l
[Left r] -> return (PPair fc l r)
[Right r] -> return (PDPair fc l Placeholder r))
<|> try (do x <- ntuple
lchar ')'
return x)
<|> do ln <- pName; lchar ':'
lty <- pExpr syn
reservedOp "**"
fc <- pfc
r <- pExpr syn
lchar ')'
return (PDPair fc (PRef fc ln) lty r)
where
restTuple = do lchar ')'; return []
<|> do lchar ','
r <- pExpr syn
lchar ')'
return [Left r]
<|> do reservedOp "**"
r <- pExpr syn
lchar ')'
return [Right r]
ntuple = try (do l <- pExpr syn; fc <- pfc; lchar ','
rest <- ntuple
return (PPair fc l rest))
<|> (do l <- pExpr syn; fc <- pfc; lchar ','
r <- pExpr syn
return (PPair fc l r))
pAlt syn = do symbol "(|"; alts <- sepBy1 (pExpr' syn) (lchar ','); symbol "|)"
return (PAlternative False alts)
pHSimpleExpr syn
= do lchar '.'
e <- pSimpleExpr syn
return $ PHidden e
<|> pSimpleExpr syn
pApp syn = do f <- pSimpleExpr syn
fc <- pfc
args <- many1 (do notEndApp
pArg syn)
i <- getState
return (dslify i $ PApp fc f args)
where
dslify i (PApp fc (PRef _ f) [a])
| [d] <- lookupCtxt Nothing f (idris_dsls i)
= desugar (syn { dsl_info = d }) i (getTm a)
dslify i t = t
pArg :: SyntaxInfo -> IParser PArg
pArg syn = try (pImplicitArg syn)
<|> try (pConstraintArg syn)
<|> do e <- pSimpleExpr syn
return (pexp e)
pImplicitArg syn = do lchar '{'
n <- pName
fc <- pfc
v <- option (PRef fc n) (do lchar '='
pExpr syn)
lchar '}'
return (pimp n v)
pConstraintArg syn = do symbol "@{"
e <- pExpr syn
symbol "}"
return (pconst e)
pRecordSet syn
= do reserved "record"
lchar '{'
fields <- sepBy1 pFieldSet (lchar ',')
lchar '}'
fc <- pfc
rec <- option Nothing (do e <- pSimpleExpr syn
return (Just e))
case rec of
Nothing ->
return (PLam (MN 0 "fldx") Placeholder
(applyAll fc fields (PRef fc (MN 0 "fldx"))))
Just v -> return (applyAll fc fields v)
where pFieldSet = do n <- pfName
lchar '='
e <- pExpr syn
return (n, e)
applyAll fc [] x = x
applyAll fc ((n, e) : es) x
= applyAll fc es (PApp fc (PRef fc (mkSet n)) [pexp e, pexp x])
mkSet (UN n) = UN ("set_" ++ n)
mkSet (MN 0 n) = MN 0 ("set_" ++ n)
mkSet (NS n s) = NS (mkSet n) s
noImp syn = syn { implicitAllowed = False }
impOK syn = syn { implicitAllowed = True }
pTSig syn = do lchar ':'
cs <- if implicitAllowed syn then pConstList syn else return []
sc <- pExpr syn
return (bindList (PPi constraint) (map (\x -> (MN 0 "c", x)) cs) sc)
pLambda syn = do lchar '\\'
try (do xt <- tyOptDeclList syn
symbol "=>"
sc <- pExpr syn
return (bindList PLam xt sc)
<|> (do ps <- sepBy (do fc <- pfc
e <- pSimpleExpr syn
return (fc, e)) (lchar ',')
symbol "=>"
sc <- pExpr syn
return (pmList (zip [0..] ps) sc)))
where pmList [] sc = sc
pmList ((i, (fc, x)) : xs) sc
= PLam (MN i "lamp") Placeholder
(PCase fc (PRef fc (MN i "lamp"))
[(x, pmList xs sc)])
pLet syn = try (do reserved "let"; n <- pName;
ty <- option Placeholder (do lchar ':'; pExpr' syn)
lchar '='
v <- pExpr syn
reserved "in"; sc <- pExpr syn
return (PLet n ty v sc))
<|> (do reserved "let"; fc <- pfc; pat <- pExpr' (syn { inPattern = True } )
symbol "="; v <- pExpr syn
reserved "in"; sc <- pExpr syn
return (PCase fc v [(pat, sc)]))
pPi syn =
try (do lazy <- option False (do lchar '|'; return True)
st <- pStatic
lchar '('; xt <- tyDeclList syn; lchar ')'
symbol "->"
sc <- pExpr syn
return (bindList (PPi (Exp lazy st)) xt sc))
<|> try (if implicitAllowed syn
then do lazy <- option False (do lchar '|'
return True)
st <- pStatic
lchar '{'
xt <- tyDeclList syn
lchar '}'
symbol "->"
sc <- pExpr syn
return (bindList (PPi (Imp lazy st)) xt sc)
else fail "No implicit arguments allowed here")
<|> try (do lchar '{'
reserved "auto"
xt <- tyDeclList syn
lchar '}'
symbol "->"
sc <- pExpr syn
return (bindList (PPi (TacImp False Dynamic (PTactics [Trivial]))) xt sc))
<|> try (do lchar '{'
reserved "default"
script <- pSimpleExpr syn
xt <- tyDeclList syn
lchar '}'
symbol "->"
sc <- pExpr syn
return (bindList (PPi (TacImp False Dynamic script)) xt sc))
<|> do --lazy <- option False (do lchar '|'; return True)
lchar '{'
reserved "static"
lchar '}'
t <- pExpr' syn
symbol "->"
sc <- pExpr syn
return (PPi (Exp False Static) (MN 42 "__pi_arg") t sc)
pConstList :: SyntaxInfo -> IParser [PTerm]
pConstList syn = try (do lchar '('
tys <- sepBy1 (pExpr' (noImp syn)) (lchar ',')
lchar ')'
reservedOp "=>"
return tys)
<|> try (do t <- pExpr (noImp syn)
reservedOp "=>"
return [t])
<|> return []
tyDeclList syn = try (sepBy1 (do x <- pfName
t <- pTSig (noImp syn)
return (x,t))
(lchar ','))
<|> do ns <- sepBy1 pName (lchar ',')
t <- pTSig (noImp syn)
return (map (\x -> (x, t)) ns)
tyOptDeclList syn = sepBy1 (do x <- pfName;
t <- option Placeholder (do lchar ':'
pExpr syn)
return (x,t))
(lchar ',')
bindList b [] sc = sc
bindList b ((n, t):bs) sc = b n t (bindList b bs sc)
pComprehension syn
= do lchar '['
fc <- pfc
pat <- pExpr syn
lchar '|'
qs <- sepBy1 (pDo syn) (lchar ',')
lchar ']'
return (PDoBlock (map addGuard qs ++
[DoExp fc (PApp fc (PRef fc (UN "return"))
[pexp pat])]))
where addGuard (DoExp fc e) = DoExp fc (PApp fc (PRef fc (UN "guard"))
[pexp e])
addGuard x = x
pDoBlock syn
= do reserved "do"
openBlock
pushIndent
ds <- many1 (do notEndBlock
x <- pDo syn
pKeepTerminator
return x)
popIndent
closeBlock
return (PDoBlock ds)
pDo syn
= try (do reserved "let"
i <- pName;
ty <- option Placeholder (do lchar ':'
pExpr' syn)
reservedOp "="
fc <- pfc
e <- pExpr syn
return (DoLet fc i ty e))
<|> try (do reserved "let"
i <- pExpr' syn
reservedOp "="
fc <- pfc
sc <- pExpr syn
return (DoLetP fc i sc))
<|> try (do i <- pName
symbol "<-"
fc <- pfc
e <- pExpr syn;
return (DoBind fc i e))
<|> try (do i <- pExpr' syn
symbol "<-"
fc <- pfc
e <- pExpr syn;
return (DoBindP fc i e))
<|> try (do e <- pExpr syn
fc <- pfc
return (DoExp fc e))
pIdiom syn
= do symbol "[|"
fc <- pfc
e <- pExpr syn
symbol "|]"
return (PIdiom fc e)
pConstant :: IParser Const
pConstant = do reserved "Integer";return BIType
<|> do reserved "Int"; return IType
<|> do reserved "Char"; return ChType
<|> do reserved "Float"; return FlType
<|> do reserved "String"; return StrType
<|> do reserved "Ptr"; return PtrType
<|> try (do f <- float; return $ Fl f)
-- <|> try (do i <- natural; lchar 'L'; return $ BI i)
<|> try (do i <- natural; return $ I (fromInteger i))
<|> try (do s <- strlit; return $ Str s)
<|> try (do c <- chlit; return $ Ch c)
pStatic :: IParser Static
pStatic = do lchar '['
reserved "static"
lchar ']';
return Static
<|> return Dynamic
table fixes
= [[prefix "-" (\fc x -> PApp fc (PRef fc (UN "-"))
[pexp (PApp fc (PRef fc (UN "fromInteger")) [pexp (PConstant (I 0))]), pexp x])]]
++ toTable (reverse fixes) ++
[[backtick],
[binary "=" PEq AssocLeft],
[binary "->" (\fc x y -> PPi expl (MN 42 "__pi_arg") x y) AssocRight]]
toTable fs = map (map toBin)
(groupBy (\ (Fix x _) (Fix y _) -> prec x == prec y) fs)
where toBin (Fix (PrefixN _) op) = prefix op
(\fc x -> PApp fc (PRef fc (UN op)) [pexp x])
toBin (Fix f op)
= binary op (\fc x y -> PApp fc (PRef fc (UN op)) [pexp x,pexp y]) (assoc f)
assoc (Infixl _) = AssocLeft
assoc (Infixr _) = AssocRight
assoc (InfixN _) = AssocNone
binary name f = Infix (do reservedOp name
fc <- pfc;
return (f fc))
prefix name f = Prefix (do reservedOp name
fc <- pfc;
return (f fc))
backtick = Infix (do lchar '`'; n <- pfName
lchar '`'
fc <- pfc
return (\x y -> PApp fc (PRef fc n) [pexp x, pexp y])) AssocNone
--------- Data declarations ---------
-- (works for classes too - 'abstract' means the data/class is visible but members not)
accData :: Maybe Accessibility -> Name -> [Name] -> IParser ()
accData (Just Frozen) n ns = do addAcc n (Just Frozen)
mapM_ (\n -> addAcc n (Just Hidden)) ns
accData a n ns = do addAcc n a
mapM_ (`addAcc` a) ns
pRecord :: SyntaxInfo -> IParser PDecl
pRecord syn = do acc <- pAccessibility
reserved "record"
fc <- pfc
tyn_in <- pfName
ty <- pTSig (impOK syn)
let tyn = expandNS syn tyn_in
reserved "where"
openBlock
pushIndent
(cn, cty, _) <- pConstructor syn
pKeepTerminator
popIndent
closeBlock
accData acc tyn [cn]
let rsyn = syn { syn_namespace = show (nsroot tyn) :
syn_namespace syn }
let fns = getRecNames rsyn cty
mapM_ (\n -> addAcc n (toFreeze acc)) fns
return $ PRecord rsyn fc tyn ty cn cty
where
getRecNames syn (PPi _ n _ sc) = [expandNS syn n, expandNS syn (mkSet n)]
++ getRecNames syn sc
getRecNames _ _ = []
toFreeze (Just Frozen) = Just Hidden
toFreeze x = x
pDataI = do reserved "data"; return False
<|> do reserved "codata"; return True
pData :: SyntaxInfo -> IParser PDecl
pData syn = try (do acc <- pAccessibility
co <- pDataI
fc <- pfc
tyn_in <- pfName
ty <- pTSig (impOK syn)
let tyn = expandNS syn tyn_in
reserved "where"
openBlock
pushIndent
cons <- many (do notEndBlock
c <- pConstructor syn
pKeepTerminator
return c) -- (lchar '|')
popIndent
closeBlock
accData acc tyn (map (\ (n, _, _) -> n) cons)
return $ PData syn fc co (PDatadecl tyn ty cons))
<|> try (do pushIndent
acc <- pAccessibility
co <- pDataI
fc <- pfc
tyn_in <- pfName
args <- many pName
let tyn = expandNS syn tyn_in
lchar '='
cons <- sepBy1 (pSimpleCon syn) (lchar '|')
pTerminator
let conty = mkPApp fc (PRef fc tyn) (map (PRef fc) args)
let ty = bindArgs (map (const PSet) args) PSet
cons' <- mapM (\ (x, cargs, cfc) ->
do let cty = bindArgs cargs conty
return (x, cty, cfc)) cons
accData acc tyn (map (\ (n, _, _) -> n) cons')
return $ PData syn fc co (PDatadecl tyn ty cons'))
where
mkPApp fc t [] = t
mkPApp fc t xs = PApp fc t (map pexp xs)
bindArgs :: [PTerm] -> PTerm -> PTerm
bindArgs xs t = foldr (PPi expl (MN 0 "t")) t xs
pConstructor :: SyntaxInfo -> IParser (Name, PTerm, FC)
pConstructor syn
= do cn_in <- pfName; fc <- pfc
let cn = expandNS syn cn_in
ty <- pTSig (impOK syn)
-- ty' <- implicit syn cn ty
return (cn, ty, fc)
pSimpleCon :: SyntaxInfo -> IParser (Name, [PTerm], FC)
pSimpleCon syn
= do cn_in <- pfName
let cn = expandNS syn cn_in
fc <- pfc
args <- many (do notEndApp
pSimpleExpr syn)
return (cn, args, fc)
--------- DSL syntax overloading ---------
pDSL :: SyntaxInfo -> IParser PDecl
pDSL syn = do reserved "dsl"
n <- pfName
openBlock
pushIndent
bs <- many1 (do notEndBlock
b <- pOverload syn
pKeepTerminator
return b)
popIndent; closeBlock
let dsl = mkDSL bs (dsl_info syn)
checkDSL dsl
i <- getState
setState (i { idris_dsls = addDef n dsl (idris_dsls i) })
return (PDSL n dsl)
where mkDSL bs dsl = let var = lookup "variable" bs
first = lookup "index_first" bs
next = lookup "index_next" bs
leto = lookup "let" bs
lambda = lookup "lambda" bs in
initDSL { dsl_var = var,
index_first = first,
index_next = next,
dsl_lambda = lambda,
dsl_let = leto }
checkDSL :: DSL -> IParser ()
checkDSL dsl = return ()
pOverload :: SyntaxInfo -> IParser (String, PTerm)
pOverload syn = do o <- identifier <|> do reserved "let"
return "let"
if o `notElem` overloadable
then fail $ show o ++ " is not an overloading"
else do
lchar '='
t <- pExpr syn
return (o, t)
where overloadable = ["let","lambda","index_first","index_next","variable"]
--------- Pattern match clauses ---------
pPattern :: SyntaxInfo -> IParser PDecl
pPattern syn = do fc <- pfc
clause <- pClause syn
return (PClauses fc [] (MN 2 "_") [clause]) -- collect together later
pCAF :: SyntaxInfo -> IParser PDecl
pCAF syn = do reserved "let"
n_in <- pfName; let n = expandNS syn n_in
lchar '='
t <- pExpr syn
pTerminator
fc <- pfc
return (PCAF fc n t)
pArgExpr syn = let syn' = syn { inPattern = True } in
try (pHSimpleExpr syn') <|> pSimpleExtExpr syn'
pRHS :: SyntaxInfo -> Name -> IParser PTerm
pRHS syn n = do lchar '='; pExpr syn
<|> do symbol "?="; rhs <- pExpr syn;
return (addLet rhs)
<|> do reserved "impossible"; return PImpossible
where mkN (UN x) = UN (x++"_lemma_1")
mkN (NS x n) = NS (mkN x) n
n' = mkN n
addLet (PLet n ty val rhs) = PLet n ty val (addLet rhs)
addLet (PCase fc t cs) = PCase fc t (map addLetC cs)
where addLetC (l, r) = (l, addLet r)
addLet rhs = (PLet (UN "value") Placeholder rhs (PMetavar n'))
pClause :: SyntaxInfo -> IParser PClause
pClause syn
= try (do pushIndent
n_in <- pfName; let n = expandNS syn n_in
cargs <- many (pConstraintArg syn)
iargs <- many (pImplicitArg syn)
fc <- pfc
args <- many (pArgExpr syn)
wargs <- many (pWExpr syn)
rhs <- pRHS syn n
ist <- getState
let ctxt = tt_ctxt ist
let wsyn = syn { syn_namespace = [] }
(wheres, nmap) <- choice [do x <- pWhereblock n wsyn
popIndent
return x,
do pTerminator
return ([], [])]
let capp = PApp fc (PRef fc n)
(iargs ++ cargs ++ map pexp args)
ist <- getState
setState (ist { lastParse = Just n })
return $ PClause fc n capp wargs rhs wheres)
<|> try (do pushIndent
wargs <- many1 (pWExpr syn)
ist <- getState
n <- case lastParse ist of
Just t -> return t
Nothing -> fail "Invalid clause"
fc <- pfc
rhs <- pRHS syn n
let ctxt = tt_ctxt ist
let wsyn = syn { syn_namespace = [] }
(wheres, nmap) <- choice [do x <- pWhereblock n wsyn
popIndent
return x,
do pTerminator
return ([], [])]
return $ PClauseR fc wargs rhs wheres)
<|> try (do pushIndent
n_in <- pfName; let n = expandNS syn n_in
cargs <- many (pConstraintArg syn)
iargs <- many (pImplicitArg syn)
fc <- pfc
args <- many (pArgExpr syn)
wargs <- many (pWExpr syn)
let capp = PApp fc (PRef fc n)
(iargs ++ cargs ++ map pexp args)
ist <- getState
setState (ist { lastParse = Just n })
reserved "with"
wval <- pSimpleExpr syn
openBlock
ds <- many1 $ pFunDecl syn
let withs = map (fillLHSD n capp wargs) $ concat ds
closeBlock
popIndent
return $ PWith fc n capp wargs wval withs)
<|> try (do wargs <- many1 (pWExpr syn)
fc <- pfc
reserved "with"
wval <- pSimpleExpr syn
openBlock
ds <- many1 $ pFunDecl syn
let withs = concat ds
closeBlock
return $ PWithR fc wargs wval withs)
<|> do pushIndent
l <- pArgExpr syn
op <- operator
let n = expandNS syn (UN op)
r <- pArgExpr syn
fc <- pfc
wargs <- many (pWExpr syn)
rhs <- pRHS syn n
let wsyn = syn { syn_namespace = [] }
(wheres, nmap) <- choice [do x <- pWhereblock n wsyn
popIndent
return x,
do pTerminator
return ([], [])]
ist <- getState
let capp = PApp fc (PRef fc n) [pexp l, pexp r]
setState (ist { lastParse = Just n })
return $ PClause fc n capp wargs rhs wheres
<|> do l <- pArgExpr syn
op <- operator
let n = expandNS syn (UN op)
r <- pArgExpr syn
fc <- pfc
wargs <- many (pWExpr syn)
reserved "with"
wval <- pSimpleExpr syn
openBlock
ds <- many1 $ pFunDecl syn
closeBlock
ist <- getState
let capp = PApp fc (PRef fc n) [pexp l, pexp r]
let withs = map (fillLHSD n capp wargs) $ concat ds
setState (ist { lastParse = Just n })
return $ PWith fc n capp wargs wval withs
where
fillLHS n capp owargs (PClauseR fc wargs v ws)
= PClause fc n capp (owargs ++ wargs) v ws
fillLHS n capp owargs (PWithR fc wargs v ws)
= PWith fc n capp (owargs ++ wargs) v
(map (fillLHSD n capp (owargs ++ wargs)) ws)
fillLHS _ _ _ c = c
fillLHSD n c a (PClauses fc o fn cs) = PClauses fc o fn (map (fillLHS n c a) cs)
fillLHSD n c a x = x
pWExpr :: SyntaxInfo -> IParser PTerm
pWExpr syn = do lchar '|'
pExpr' syn
pWhereblock :: Name -> SyntaxInfo -> IParser ([PDecl], [(Name, Name)])
pWhereblock n syn
= do reserved "where"; openBlock
ds <- many1 $ pDecl syn
let dns = concatMap (concatMap declared) ds
closeBlock
return (concat ds, map (\x -> (x, decoration syn x)) dns)
pDirective :: IParser [PDecl]
pDirective = try (do lchar '%'; reserved "lib"; lib <- strlit;
return [PDirective (do addLib lib
addIBC (IBCLib lib))])
<|> try (do lchar '%'; reserved "link"; obj <- strlit;
return [PDirective (do datadir <- liftIO getDataDir
o <- liftIO $ findInPath [".", datadir] obj
addIBC (IBCObj o)
addObjectFile o)])
<|> try (do lchar '%'; reserved "include"; hdr <- strlit;
return [PDirective (do addHdr hdr
addIBC (IBCHeader hdr))])
<|> try (do lchar '%'; reserved "hide"; n <- iName []
return [PDirective (do setAccessibility n Hidden
addIBC (IBCAccess n Hidden))])
<|> try (do lchar '%'; reserved "freeze"; n <- iName []
return [PDirective (do setAccessibility n Frozen
addIBC (IBCAccess n Frozen))])
<|> try (do lchar '%'; reserved "access"; acc <- pAccessibility'
return [PDirective (do i <- getIState
putIState (i { default_access = acc }))])
<|> try (do lchar '%'; reserved "default"; tot <- pTotality
i <- getState
setState (i { default_total = tot } )
return [PDirective (do i <- getIState
putIState (i { default_total = tot }))])
<|> try (do lchar '%'; reserved "logging"; i <- natural;
return [PDirective (setLogLevel (fromInteger i))])
pTactic :: SyntaxInfo -> IParser PTactic
pTactic syn = do reserved "intro"; ns <- sepBy pName (lchar ',')
return $ Intro ns
<|> do reserved "intros"; return Intros
<|> try (do reserved "refine"; n <- pName
imps <- many1 imp
return $ Refine n imps)
<|> do reserved "refine"; n <- pName
i <- getState
return $ Refine n []
<|> do reserved "rewrite"; t <- pExpr syn;
i <- getState
return $ Rewrite (desugar syn i t)
<|> do reserved "let"; n <- pName; lchar '=';
t <- pExpr syn;
i <- getState
return $ LetTac n (desugar syn i t)
<|> do reserved "focus"; n <- pName
return $ Focus n
<|> do reserved "exact"; t <- pExpr syn;
i <- getState
return $ Exact (desugar syn i t)
<|> do reserved "try"; t <- pTactic syn;
lchar '|';
t1 <- pTactic syn
return $ Try t t1
<|> do lchar '{'
t <- pTactic syn;
lchar ';';
t1 <- pTactic syn;
lchar '}'
return $ TSeq t t1
<|> do reserved "compute"; return Compute
<|> do reserved "trivial"; return Trivial
<|> do reserved "solve"; return Solve
<|> do reserved "attack"; return Attack
<|> do reserved "state"; return ProofState
<|> do reserved "term"; return ProofTerm
<|> do reserved "undo"; return Undo
<|> do reserved "qed"; return Qed
<|> do reserved "abandon"; return Abandon
<|> do lchar ':'; reserved "q"; return Abandon
where
imp = do lchar '?'; return False
<|> do lchar '_'; return True