reflection 2.1.4 → 2.1.5
raw patch · 11 files changed
+285/−170 lines, 11 filesdep +QuickCheckdep +hspecdep +reflection
Dependencies added: QuickCheck, hspec, reflection
Files
- .travis.yml +150/−125
- CHANGELOG.markdown +4/−0
- examples/Constraints.hs +13/−8
- examples/FromJSON.hs +22/−19
- examples/Monoid.hs +3/−1
- examples/ReaderLike.hs +1/−2
- examples/reflection-examples.cabal +8/−10
- fast/Data/Reflection.hs +19/−1
- reflection.cabal +19/−4
- tests/ReifyNatSpec.hs +45/−0
- tests/Spec.hs +1/−0
.travis.yml view
@@ -1,161 +1,186 @@ # This Travis job script has been generated by a script via #-# runghc make_travis_yml_2.hs '-o' '.travis.yml' '--ghc-head' '--jobs=2' '--irc-channel=irc.freenode.org#haskell-lens' '--no-no-tests-no-bench' '--no-install-dependencies' 'cabal.project'+# haskell-ci '--output=.travis.yml' '--config=cabal.haskell-ci' 'cabal.project' #-# For more information, see https://github.com/hvr/multi-ghc-travis+# For more information, see https://github.com/haskell-CI/haskell-ci #+# version: 0.3.20190815+# language: c-sudo: false-+dist: xenial git:- submodules: false # whether to recursively clone submodules-+ # whether to recursively clone submodules+ submodules: false notifications: irc: channels:- - "irc.freenode.org#haskell-lens"+ - irc.freenode.org#haskell-lens skip_join: true template:- - "\x0313reflection\x03/\x0306%{branch}\x03 \x0314%{commit}\x03 %{build_url} %{message}"-+ - "\"\\x0313reflection\\x03/\\x0306%{branch}\\x03 \\x0314%{commit}\\x03 %{build_url} %{message}\"" cache: directories: - $HOME/.cabal/packages - $HOME/.cabal/store- before_cache:- - rm -fv $HOME/.cabal/packages/hackage.haskell.org/build-reports.log+ - rm -fv $CABALHOME/packages/hackage.haskell.org/build-reports.log # remove files that are regenerated by 'cabal update'- - rm -fv $HOME/.cabal/packages/hackage.haskell.org/00-index.*- - rm -fv $HOME/.cabal/packages/hackage.haskell.org/*.json- - rm -fv $HOME/.cabal/packages/hackage.haskell.org/01-index.cache- - rm -fv $HOME/.cabal/packages/hackage.haskell.org/01-index.tar- - rm -fv $HOME/.cabal/packages/hackage.haskell.org/01-index.tar.idx-- - rm -rfv $HOME/.cabal/packages/head.hackage-+ - rm -fv $CABALHOME/packages/hackage.haskell.org/00-index.*+ - rm -fv $CABALHOME/packages/hackage.haskell.org/*.json+ - rm -fv $CABALHOME/packages/hackage.haskell.org/01-index.cache+ - rm -fv $CABALHOME/packages/hackage.haskell.org/01-index.tar+ - rm -fv $CABALHOME/packages/hackage.haskell.org/01-index.tar.idx+ - rm -rfv $CABALHOME/packages/head.hackage matrix: include:- - compiler: "ghc-8.6.1"- env: GHCHEAD=true- addons: {apt: {packages: [ghc-ppa-tools,cabal-install-head,ghc-8.6.1], sources: [hvr-ghc]}}- - compiler: "ghc-8.4.3"- # env: TEST=--disable-tests BENCH=--disable-benchmarks- addons: {apt: {packages: [ghc-ppa-tools,cabal-install-2.2,ghc-8.4.3], sources: [hvr-ghc]}}- - compiler: "ghc-8.2.2"- # env: TEST=--disable-tests BENCH=--disable-benchmarks- addons: {apt: {packages: [ghc-ppa-tools,cabal-install-2.2,ghc-8.2.2], sources: [hvr-ghc]}}- - compiler: "ghc-8.0.2"- # env: TEST=--disable-tests BENCH=--disable-benchmarks- addons: {apt: {packages: [ghc-ppa-tools,cabal-install-2.2,ghc-8.0.2], sources: [hvr-ghc]}}- - compiler: "ghc-7.10.3"- # env: TEST=--disable-tests BENCH=--disable-benchmarks- addons: {apt: {packages: [ghc-ppa-tools,cabal-install-2.2,ghc-7.10.3], sources: [hvr-ghc]}}- - compiler: "ghc-7.8.4"- # env: TEST=--disable-tests BENCH=--disable-benchmarks- addons: {apt: {packages: [ghc-ppa-tools,cabal-install-2.2,ghc-7.8.4], sources: [hvr-ghc]}}- - compiler: "ghc-7.6.3"- # env: TEST=--disable-tests BENCH=--disable-benchmarks- addons: {apt: {packages: [ghc-ppa-tools,cabal-install-2.2,ghc-7.6.3], sources: [hvr-ghc]}}- - compiler: "ghc-7.4.2"- # env: TEST=--disable-tests BENCH=--disable-benchmarks- addons: {apt: {packages: [ghc-ppa-tools,cabal-install-2.2,ghc-7.4.2], sources: [hvr-ghc]}}- - compiler: "ghc-7.2.2"- # env: TEST=--disable-tests BENCH=--disable-benchmarks- addons: {apt: {packages: [ghc-ppa-tools,cabal-install-2.2,ghc-7.2.2], sources: [hvr-ghc]}}- - compiler: "ghc-7.0.4"- # env: TEST=--disable-tests BENCH=--disable-benchmarks- addons: {apt: {packages: [ghc-ppa-tools,cabal-install-2.2,ghc-7.0.4], sources: [hvr-ghc]}}- - compiler: "ghc-head"- env: GHCHEAD=true- addons: {apt: {packages: [ghc-ppa-tools,cabal-install-head,ghc-head], sources: [hvr-ghc]}}-+ - compiler: ghc-8.8.1+ addons: {"apt":{"sources":["hvr-ghc"],"packages":["ghc-8.8.1","cabal-install-3.0"]}}+ - compiler: ghc-8.6.5+ addons: {"apt":{"sources":["hvr-ghc"],"packages":["ghc-8.6.5","cabal-install-2.4"]}}+ - compiler: ghc-8.4.4+ addons: {"apt":{"sources":["hvr-ghc"],"packages":["ghc-8.4.4","cabal-install-2.4"]}}+ - compiler: ghc-8.2.2+ addons: {"apt":{"sources":["hvr-ghc"],"packages":["ghc-8.2.2","cabal-install-2.4"]}}+ - compiler: ghc-8.0.2+ addons: {"apt":{"sources":["hvr-ghc"],"packages":["ghc-8.0.2","cabal-install-2.4"]}}+ - compiler: ghc-7.10.3+ addons: {"apt":{"sources":["hvr-ghc"],"packages":["ghc-7.10.3","cabal-install-2.4"]}}+ - compiler: ghc-7.8.4+ addons: {"apt":{"sources":["hvr-ghc"],"packages":["ghc-7.8.4","cabal-install-2.4"]}}+ - compiler: ghc-7.6.3+ addons: {"apt":{"sources":["hvr-ghc"],"packages":["ghc-7.6.3","cabal-install-2.4"]}}+ - compiler: ghc-7.4.2+ addons: {"apt":{"sources":["hvr-ghc"],"packages":["ghc-7.4.2","cabal-install-2.4"]}}+ - compiler: ghc-7.2.2+ addons: {"apt":{"sources":["hvr-ghc"],"packages":["ghc-7.2.2","cabal-install-2.4"]}}+ - compiler: ghc-7.0.4+ addons: {"apt":{"sources":["hvr-ghc"],"packages":["ghc-7.0.4","cabal-install-2.4"]}}+ - compiler: ghc-head+ addons: {"apt":{"sources":["hvr-ghc"],"packages":["ghc-head","cabal-install-head"]}} allow_failures:- - compiler: "ghc-head"- - compiler: "ghc-7.0.4"- - compiler: "ghc-7.2.2"- - compiler: "ghc-8.6.1"-+ - compiler: ghc-head+ - compiler: ghc-7.0.4+ - compiler: ghc-7.2.2+ - compiler: ghc-8.8.1 before_install:- - HC=${CC}- - HCPKG=${HC/ghc/ghc-pkg}+ - HC=$(echo "/opt/$CC/bin/ghc" | sed 's/-/\//')+ - WITHCOMPILER="-w $HC"+ - HCPKG="$HC-pkg" - unset CC- - ROOTDIR=$(pwd)- - mkdir -p $HOME/.local/bin- - "PATH=/opt/ghc/bin:/opt/ghc-ppa-tools/bin:$HOME/local/bin:$PATH"- - HCNUMVER=$(( $(${HC} --numeric-version|sed -E 's/([0-9]+)\.([0-9]+)\.([0-9]+).*/\1 * 10000 + \2 * 100 + \3/') ))+ - CABAL=/opt/ghc/bin/cabal+ - CABALHOME=$HOME/.cabal+ - export PATH="$CABALHOME/bin:$PATH"+ - TOP=$(pwd)+ - "HCNUMVER=$(${HC} --numeric-version|perl -ne '/^(\\d+)\\.(\\d+)\\.(\\d+)(\\.(\\d+))?$/; print(10000 * $1 + 100 * $2 + ($3 == 0 ? $5 != 1 : $3))')" - echo $HCNUMVER-+ - CABAL="$CABAL -vnormal+nowrap+markoutput"+ - set -o pipefail+ - |+ echo 'function blue(s) { printf "\033[0;34m" s "\033[0m " }' >> .colorful.awk+ echo 'BEGIN { state = "output"; }' >> .colorful.awk+ echo '/^-----BEGIN CABAL OUTPUT-----$/ { state = "cabal" }' >> .colorful.awk+ echo '/^-----END CABAL OUTPUT-----$/ { state = "output" }' >> .colorful.awk+ echo '!/^(-----BEGIN CABAL OUTPUT-----|-----END CABAL OUTPUT-----)/ {' >> .colorful.awk+ echo ' if (state == "cabal") {' >> .colorful.awk+ echo ' print blue($0)' >> .colorful.awk+ echo ' } else {' >> .colorful.awk+ echo ' print $0' >> .colorful.awk+ echo ' }' >> .colorful.awk+ echo '}' >> .colorful.awk+ - cat .colorful.awk+ - |+ color_cabal_output () {+ awk -f $TOP/.colorful.awk+ }+ - echo text | color_cabal_output install:- - cabal --version+ - ${CABAL} --version - echo "$(${HC} --version) [$(${HC} --print-project-git-commit-id 2> /dev/null || echo '?')]"- - BENCH=${BENCH---enable-benchmarks}- - TEST=${TEST---enable-tests}- - HADDOCK=${HADDOCK-true}- - UNCONSTRAINED=${UNCONSTRAINED-true}- - NOINSTALLEDCONSTRAINTS=${NOINSTALLEDCONSTRAINTS-false}- - GHCHEAD=${GHCHEAD-false}- - travis_retry cabal update -v- - "sed -i.bak 's/^jobs:/-- jobs:/' ${HOME}/.cabal/config"- - rm -fv cabal.project cabal.project.local- - "sed -i.bak 's/^-- jobs:.*/jobs: 2/' ${HOME}/.cabal/config"- # Overlay Hackage Package Index for GHC HEAD: https://github.com/hvr/head.hackage+ - TEST=--enable-tests+ - BENCH=--enable-benchmarks+ - HEADHACKAGE=false+ - if [ $HCNUMVER -ge 80800 ] ; then HEADHACKAGE=true ; fi+ - rm -f $CABALHOME/config - |- if $GHCHEAD; then- sed -i 's/-- allow-newer: .*/allow-newer: *:base/' ${HOME}/.cabal/config- for pkg in $($HCPKG list --simple-output); do pkg=$(echo $pkg | sed 's/-[^-]*$//'); sed -i "s/allow-newer: /allow-newer: *:$pkg, /" ${HOME}/.cabal/config; done-- echo 'repository head.hackage' >> ${HOME}/.cabal/config- echo ' url: http://head.hackage.haskell.org/' >> ${HOME}/.cabal/config- echo ' secure: True' >> ${HOME}/.cabal/config- echo ' root-keys: 07c59cb65787dedfaef5bd5f987ceb5f7e5ebf88b904bbd4c5cbdeb2ff71b740' >> ${HOME}/.cabal/config- echo ' 2e8555dde16ebd8df076f1a8ef13b8f14c66bad8eafefd7d9e37d0ed711821fb' >> ${HOME}/.cabal/config- echo ' 8f79fd2389ab2967354407ec852cbe73f2e8635793ac446d09461ffb99527f6e' >> ${HOME}/.cabal/config- echo ' key-threshold: 3' >> ${HOME}/.cabal.config-- grep -Ev -- '^\s*--' ${HOME}/.cabal/config | grep -Ev '^\s*$'-- cabal new-update head.hackage -v+ echo "verbose: normal +nowrap +markoutput" >> $CABALHOME/config+ echo "remote-build-reporting: anonymous" >> $CABALHOME/config+ echo "write-ghc-environment-files: always" >> $CABALHOME/config+ echo "remote-repo-cache: $CABALHOME/packages" >> $CABALHOME/config+ echo "logs-dir: $CABALHOME/logs" >> $CABALHOME/config+ echo "world-file: $CABALHOME/world" >> $CABALHOME/config+ echo "extra-prog-path: $CABALHOME/bin" >> $CABALHOME/config+ echo "symlink-bindir: $CABALHOME/bin" >> $CABALHOME/config+ echo "installdir: $CABALHOME/bin" >> $CABALHOME/config+ echo "build-summary: $CABALHOME/logs/build.log" >> $CABALHOME/config+ echo "store-dir: $CABALHOME/store" >> $CABALHOME/config+ echo "install-dirs user" >> $CABALHOME/config+ echo " prefix: $CABALHOME" >> $CABALHOME/config+ echo "repository hackage.haskell.org" >> $CABALHOME/config+ echo " url: http://hackage.haskell.org/" >> $CABALHOME/config+ - |+ if $HEADHACKAGE; then+ echo "allow-newer: $($HCPKG list --simple-output | sed -E 's/([a-zA-Z-]+)-[0-9.]+/*:\1/g')" >> $CABALHOME/config+ echo "repository head.hackage.ghc.haskell.org" >> $CABALHOME/config+ echo " url: https://ghc.gitlab.haskell.org/head.hackage/" >> $CABALHOME/config+ echo " secure: True" >> $CABALHOME/config+ echo " root-keys: 7541f32a4ccca4f97aea3b22f5e593ba2c0267546016b992dfadcd2fe944e55d" >> $CABALHOME/config+ echo " 26021a13b401500c8eb2761ca95c61f2d625bfef951b939a8124ed12ecf07329" >> $CABALHOME/config+ echo " f76d08be13e9a61a377a85e2fb63f4c5435d40f8feb3e12eb05905edb8cdea89" >> $CABALHOME/config+ echo " key-threshold: 3" >> $CABALHOME/config fi- - grep -Ev -- '^\s*--' ${HOME}/.cabal/config | grep -Ev '^\s*$'- - "printf 'packages: \".\"\\n' > cabal.project"- - touch cabal.project.local- - "if ! $NOINSTALLEDCONSTRAINTS; then for pkg in $($HCPKG list --simple-output); do echo $pkg | sed 's/^/constraints: /' | sed 's/-[^-]*$/ installed/' >> cabal.project.local; done; fi"+ - "echo 'jobs: 2' >> $CABALHOME/config"+ - cat $CABALHOME/config+ - rm -fv cabal.project cabal.project.local cabal.project.freeze+ - travis_retry ${CABAL} v2-update -v+ # Generate cabal.project+ - rm -rf cabal.project cabal.project.local cabal.project.freeze+ - touch cabal.project+ - |+ echo "packages: ." >> cabal.project+ if [ $HCNUMVER -ge 71000 ] ; then echo "packages: ./examples" >> cabal.project ; fi+ - |+ - "for pkg in $($HCPKG list --simple-output); do echo $pkg | sed 's/-[^-]*$//' | (grep -vE -- '^(reflection|reflection-examples)$' || true) | sed 's/^/constraints: /' | sed 's/$/ installed/' >> cabal.project.local; done" - cat cabal.project || true - cat cabal.project.local || true- - if [ -f "./configure.ac" ]; then- (cd "." && autoreconf -i);- fi- - rm -f cabal.project.freeze- - rm -rf .ghc.environment.* "."/dist- - DISTDIR=$(mktemp -d /tmp/dist-test.XXXX)--# Here starts the actual work to be performed for the package under test;-# any command which exits with a non-zero exit code causes the build to fail.+ - if [ -f "./configure.ac" ]; then (cd "." && autoreconf -i); fi+ - if [ -f "./examples/configure.ac" ]; then (cd "./examples" && autoreconf -i); fi+ - ${CABAL} v2-freeze $WITHCOMPILER ${TEST} ${BENCH} | color_cabal_output+ - "cat cabal.project.freeze | sed -E 's/^(constraints: *| *)//' | sed 's/any.//'"+ - rm cabal.project.freeze script:- # test that source-distributions can be generated- - (cd "." && cabal sdist)- - mv "."/dist/reflection-*.tar.gz ${DISTDIR}/+ - DISTDIR=$(mktemp -d /tmp/dist-test.XXXX)+ # Packaging...+ - ${CABAL} v2-sdist all | color_cabal_output+ # Unpacking...+ - mv dist-newstyle/sdist/*.tar.gz ${DISTDIR}/ - cd ${DISTDIR} || false- - find . -maxdepth 1 -name '*.tar.gz' -exec tar -xvf '{}' \;- - "printf 'packages: reflection-*/*.cabal\\n' > cabal.project"- - touch cabal.project.local- - "if ! $NOINSTALLEDCONSTRAINTS; then for pkg in $($HCPKG list --simple-output); do echo $pkg | sed 's/^/constraints: /' | sed 's/-[^-]*$/ installed/' >> cabal.project.local; done; fi"+ - find . -maxdepth 1 -type f -name '*.tar.gz' -exec tar -xvf '{}' \;+ - find . -maxdepth 1 -type f -name '*.tar.gz' -exec rm '{}' \;+ - PKGDIR_reflection="$(find . -maxdepth 1 -type d -regex '.*/reflection-[0-9.]*')"+ - PKGDIR_reflection_examples="$(find . -maxdepth 1 -type d -regex '.*/reflection-examples-[0-9.]*')"+ # Generate cabal.project+ - rm -rf cabal.project cabal.project.local cabal.project.freeze+ - touch cabal.project+ - |+ echo "packages: ${PKGDIR_reflection}" >> cabal.project+ if [ $HCNUMVER -ge 71000 ] ; then echo "packages: ${PKGDIR_reflection_examples}" >> cabal.project ; fi+ - |+ - "for pkg in $($HCPKG list --simple-output); do echo $pkg | sed 's/-[^-]*$//' | (grep -vE -- '^(reflection|reflection-examples)$' || true) | sed 's/^/constraints: /' | sed 's/$/ installed/' >> cabal.project.local; done" - cat cabal.project || true - cat cabal.project.local || true-+ # Building with tests and benchmarks... # build & run tests, build benchmarks- - cabal new-build -w ${HC} ${TEST} ${BENCH} all-- # cabal check- - (cd reflection-* && cabal check)-- # haddock- - rm -rf ./dist-newstyle- - if $HADDOCK; then cabal new-haddock -w ${HC} ${TEST} ${BENCH} all; else echo "Skipping haddock generation";fi-- # Build without installed constraints for packages in global-db- - if $UNCONSTRAINED; then rm -f cabal.project.local; echo cabal new-build -w ${HC} --disable-tests --disable-benchmarks all; else echo "Not building without installed constraints"; fi+ - ${CABAL} v2-build $WITHCOMPILER ${TEST} ${BENCH} all | color_cabal_output+ # Testing...+ - ${CABAL} v2-test $WITHCOMPILER ${TEST} ${BENCH} all | color_cabal_output+ # cabal check...+ - (cd ${PKGDIR_reflection} && ${CABAL} -vnormal check)+ - if [ $HCNUMVER -ge 71000 ] ; then (cd ${PKGDIR_reflection_examples} && ${CABAL} -vnormal check) ; fi+ # haddock...+ - ${CABAL} v2-haddock $WITHCOMPILER ${TEST} ${BENCH} all | color_cabal_output+ # Building without installed constraints for packages in global-db...+ - rm -f cabal.project.local+ - ${CABAL} v2-build $WITHCOMPILER --disable-tests --disable-benchmarks all | color_cabal_output -# REGENDATA ["-o",".travis.yml","--ghc-head","--jobs=2","--irc-channel=irc.freenode.org#haskell-lens","--no-no-tests-no-bench","--no-install-dependencies","cabal.project"]+# REGENDATA ["--output=.travis.yml","--config=cabal.haskell-ci","cabal.project"] # EOF
CHANGELOG.markdown view
@@ -1,3 +1,7 @@+# 2.1.5 [2019.08.27]+* Fix a bug in which `reifyNat` would yield incorrect results for very large+ `Integer`s on GHC 8.2 or later.+ # 2.1.4 [2018.07.02] * Allow building with GHC 8.6.
examples/Constraints.hs view
@@ -1,12 +1,14 @@-{-# LANGUAGE Rank2Types, TypeFamilies, TypeOperators, ConstraintKinds, PolyKinds, FlexibleInstances, MultiParamTypeClasses, ScopedTypeVariables, FlexibleContexts, UndecidableInstances #-}+{-# LANGUAGE Rank2Types, TypeFamilies, TypeOperators, ConstraintKinds, PolyKinds, FlexibleInstances, MultiParamTypeClasses, ScopedTypeVariables, FlexibleContexts, UndecidableInstances, CPP #-} module Constraints where -import Control.Newtype -- from newtype-import Data.Constraint -- from constraints-import Data.Constraint.Unsafe -- from constraints-import Data.Monoid -- from base-import Data.Proxy -- from tagged-import Data.Reflection -- from reflection+import Control.Newtype -- from newtype+import Data.Constraint -- from constraints+import Data.Constraint.Unsafe -- from constraints+import Data.Proxy -- from tagged+import Data.Reflection -- from reflection+#if !(MIN_VERSION_base(4,11,0))+import Data.Semigroup -- from semigroups+#endif -- | Values in our dynamically constructed monoid over 'a' newtype Lift (p :: * -> Constraint) (a :: *) (s :: *) = Lift { lower :: a }@@ -42,8 +44,11 @@ data Def Monoid a = Monoid { mappend_ :: a -> a -> a, mempty_ :: a } reifiedIns = Sub Dict +instance Reifies s (Def Monoid a) => Semigroup (Lift Monoid a s) where+ a <> b = Lift $ mappend_ (reflect a) (lower a) (lower b)+ instance Reifies s (Def Monoid a) => Monoid (Lift Monoid a s) where- mappend a b = Lift $ mappend_ (reflect a) (lower a) (lower b)+ mappend = (<>) mempty = a where a = Lift $ mempty_ (reflect a) data ClassProxy (p :: * -> Constraint) = ClassProxy
examples/FromJSON.hs view
@@ -1,27 +1,29 @@ -- Example of a dynamically generated FromJSON instance. ----- Can be useful when one needs to use a function with a --- FromJSON constraint, but some detail about the +-- Can be useful when one needs to use a function with a+-- FromJSON constraint, but some detail about the -- conversion from JSON is not known until runtime.+{-# LANGUAGE CPP #-} {-# LANGUAGE Rank2Types #-} {-# LANGUAGE FlexibleContexts #-} {-# LANGUAGE UndecidableInstances #-} {-# LANGUAGE ScopedTypeVariables #-} {-# LANGUAGE OverloadedStrings #-} -import Data.Reflection -- from reflection-import Data.Monoid -- from base-import Data.Proxy -- from tagged-import Data.Text -- from text-import Data.Monoid -import Data.Aeson -- from aeson +import Data.Aeson -- from aeson import Data.Aeson.Types (Parser)+import Data.Proxy -- from tagged+import Data.Reflection -- from reflection+#if !(MIN_VERSION_base(4,11,0))+import Data.Semigroup -- from base+#endif+import Data.Text (Text, pack) -- from text import Control.Applicative -- These imports are only for constructing the example value-import Control.Lens (preview) -- from lens-import Data.Aeson.Lens (_Value,_String) -- form lens-aeson+import Lens.Micro.Aeson (_Value) -- form microlens-aeson+import Lens.Micro.Extras (preview) -- from microlens data Foo = Foo {@@ -35,15 +37,16 @@ -- A wrapper over Foo carrying a phantom type s newtype J a s = J { runJ :: a }- --- If the phantom type s reifies the parsing function, we can --- use reflect to recover the function and implement ++-- If the phantom type s reifies the parsing function, we can+-- use reflect to recover the function and implement -- our FromJSON instance for J. instance Reifies s (Object -> Parser a) => FromJSON (J a s) where parseJSON (Object v) = J <$> reflect (Proxy :: Proxy s) v- + parseJSON _ = empty+ -- Convince the compiler that the phantom type in the proxy--- supplied by reify is the same as the phantom type in J. +-- supplied by reify is the same as the phantom type in J. -- -- Otherwise the FromJSON instance for J won't kick in. asProxyJ :: Proxy s -> J a s -> J a s@@ -53,18 +56,18 @@ exampleJSON = maybe Null id (preview _Value str) where str = "{ \"zzfield1\" : 5, \"zzfield2\" : 7 }"::Text- + main :: IO () main = do putStrLn "Enter prefix for the fields: " -- "zz" must be entered for the parse to succeed prefix <- fmap pack getLine- + -- fromJSON uses the dynamically generated FromJSON instance let result = reify (fooParser prefix) $ \proxy -> -- We must eliminate the J newtype before returning -- because, thanks to parametricity, -- the phantom type cannot escape the callback.- runJ . asProxyJ proxy <$> fromJSON exampleJSON - + runJ . asProxyJ proxy <$> fromJSON exampleJSON+ putStrLn (show (result :: Result Foo))
examples/Monoid.hs view
@@ -1,9 +1,11 @@ {-# LANGUAGE CPP, Rank2Types, FlexibleContexts, UndecidableInstances #-} module Monoid where +import Data.Proxy -- from tagged import Data.Reflection -- from reflection+#if !(MIN_VERSION_base(4,11,0)) import Data.Semigroup -- from base-import Data.Proxy -- from tagged+#endif -- | Values in our dynamically-constructed 'Monoid' over 'a' newtype M a s = M { runM :: a } deriving (Eq,Ord)
examples/ReaderLike.hs view
@@ -9,7 +9,6 @@ import Data.Proxy import Data.Reflection-import Control.Applicative import System.IO data MyConfig = MyConfig@@ -37,7 +36,7 @@ conf = reflect (Proxy :: Proxy p) run :: forall p. (Reifies p MyConfig) => Proxy p -> IO ()-run p = do+run _ = do d1 <- ask "Datum 1:" :: IO (Datum p) d2 <- ask "Datum 2:" :: IO (Datum p) -- look ma, no plumbing
examples/reflection-examples.cabal view
@@ -15,16 +15,12 @@ 2004 Oleg Kiselyov and Chung-chieh Shan build-type: Simple cabal-version: >= 1.10-tested-with: GHC == 7.0.4- , GHC == 7.2.2- , GHC == 7.4.2- , GHC == 7.6.3- , GHC == 7.8.4- , GHC == 7.10.3+tested-with: GHC == 7.10.3 , GHC == 8.0.2 , GHC == 8.2.2- , GHC == 8.4.3- , GHC == 8.6.1+ , GHC == 8.4.4+ , GHC == 8.6.5+ , GHC == 8.8.1 flag examples default: True@@ -38,6 +34,7 @@ constraints, newtype, reflection,+ semigroups, tagged hs-source-dirs: . ghc-options: -Wall@@ -49,9 +46,10 @@ main-is: FromJSON.hs build-depends: aeson, base >= 4.8 && < 5,- lens,- lens-aeson,+ microlens,+ microlens-aeson, reflection,+ semigroups, tagged, text hs-source-dirs: .
fast/Data/Reflection.hs view
@@ -133,6 +133,11 @@ #if (__GLASGOW_HASKELL__ >= 707) || (defined(MIN_VERSION_template_haskell) && USE_TYPE_LITS) import GHC.TypeLits+# if MIN_VERSION_base(4,10,0)+import Numeric.Natural (Natural)+# elif __GLASGOW_HASKELL__ >= 707+import Control.Exception (ArithException(..), throw)+# endif #endif #ifdef __HUGS__@@ -187,6 +192,9 @@ -- | This upgraded version of 'reify' can be used to generate a 'KnownNat' suitable for use with other APIs. --+-- Attemping to pass a negative 'Integer' as an argument will result in an+-- 'Underflow' exception.+-- -- /Available only on GHC 7.8+/ -- -- >>> reifyNat 4 natVal@@ -196,7 +204,17 @@ -- 4 reifyNat :: forall r. Integer -> (forall (n :: Nat). KnownNat n => Proxy n -> r) -> r-reifyNat n k = unsafeCoerce (MagicNat k :: MagicNat r) n Proxy+reifyNat n k = unsafeCoerce (MagicNat k :: MagicNat r)+# if MIN_VERSION_base(4,10,0)+ -- Starting with base-4.10, the internal+ -- representation of KnownNat changed from Integer+ -- to Natural, so make sure to perform the same+ -- conversion before unsafeCoercing.+ (fromInteger n :: Natural)+# else+ (if n < 0 then throw Underflow else n)+# endif+ Proxy -------------------------------------------------------------------------------- -- KnownSymbol
reflection.cabal view
@@ -1,5 +1,5 @@ name: reflection-version: 2.1.4+version: 2.1.5 license: BSD3 license-file: LICENSE author: Edward A. Kmett, Elliott Hird, Oleg Kiselyov and Chung-chieh Shan@@ -35,8 +35,9 @@ , GHC == 7.10.3 , GHC == 8.0.2 , GHC == 8.2.2- , GHC == 8.4.3- , GHC == 8.6.1+ , GHC == 8.4.4+ , GHC == 8.6.5+ , GHC == 8.8.1 extra-source-files: examples/reflection-examples.cabal@@ -81,7 +82,7 @@ if !impl(ghc >= 8.0) build-depends:- semigroups >= 0.11 && < 0.19+ semigroups >= 0.11 && < 0.20 default-language: Haskell98 @@ -105,3 +106,17 @@ CPP exposed-modules: Data.Reflection++test-suite spec+ type: exitcode-stdio-1.0+ hs-source-dirs: tests+ main-is: Spec.hs+ other-modules: ReifyNatSpec+ ghc-options: -Wall+ default-language: Haskell98+ build-tool-depends: hspec-discover:hspec-discover >= 1.8+ build-depends:+ base >= 2 && < 5,+ hspec >= 2 && < 3,+ QuickCheck >= 2 && < 3,+ reflection
+ tests/ReifyNatSpec.hs view
@@ -0,0 +1,45 @@+{-# LANGUAGE CPP #-}+{-# LANGUAGE ScopedTypeVariables #-}+module ReifyNatSpec where++#if __GLASGOW_HASKELL__ >= 708+import Control.Exception (ArithException(..), evaluate)+import Data.Reflection+import Test.Hspec.QuickCheck+import Test.QuickCheck (Negative(..), NonNegative(..))++# if MIN_VERSION_base(4,10,0)+import GHC.TypeNats (natVal)+import Numeric.Natural (Natural)+# endif+#endif++import Test.Hspec++main :: IO ()+main = hspec spec++spec :: Spec+spec =+#if __GLASGOW_HASKELL__ >= 708+ describe "reifyNat" $ do+ prop "reify positive Integers and reflect them back" $+ \(NonNegative (i :: Integer)) -> reifyNat i $ \p -> reflect p `shouldBe` i+ prop "should throw an Underflow exception on negative inputs" $+ \(Negative (i :: Integer)) ->+ reifyNat i (evaluate . reflect) `shouldThrow` (== Underflow)+# if MIN_VERSION_base(4,10,0)+ it "should reflect very large Naturals correctly" $ do -- #41+ let d42, d2_63, d2_64 :: Natural+ d42 = 42+ d2_63 = 2^(63 :: Natural)+ d2_64 = 2^(64 :: Natural)+ reifyNat (toInteger d42) $ \p -> natVal p `shouldBe` d42+ reifyNat (toInteger (d2_63-1)) $ \p -> natVal p `shouldBe` d2_63-1+ reifyNat (toInteger d2_63) $ \p -> natVal p `shouldBe` d2_63+ reifyNat (toInteger (d2_64-1)) $ \p -> natVal p `shouldBe` d2_64-1+ reifyNat (toInteger d2_64) $ \p -> natVal p `shouldBe` d2_64+# endif+#else+ return ()+#endif
+ tests/Spec.hs view
@@ -0,0 +1,1 @@+{-# OPTIONS_GHC -F -pgmF hspec-discover #-}