{-# LANGUAGE CPP #-}
{-# LANGUAGE ConstraintKinds #-}
{-# LANGUAGE ExistentialQuantification #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE RankNTypes #-}
{-# LANGUAGE RecordWildCards #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE TupleSections #-}
{-# LANGUAGE TypeOperators #-}
{-# LANGUAGE CPP #-}
{-# LANGUAGE DeriveDataTypeable #-}
{-# LANGUAGE MonoLocalBinds #-}

module Language.C.Inline.Internal
    ( -- * Context handling
      setContext
    , getContext

      -- * Substitution
    , Substitutions(..)
    , substitute
    , getHaskellType

      -- * Emitting and invoking C code
      --
      -- | The functions in this section let us access more the C file
      -- associated with the current module.  They can be used to build
      -- additional features on top of the basic machinery.  All of
      -- @inline-c@ is based upon the functions defined here.

      -- ** Emitting C code
    , emitVerbatim
    , emitBlock

      -- ** Inlining C code
      -- $embedding
    , Code(..)
    , inlineCode
    , inlineExp
    , inlineItems

      -- * Parsing
      --
      -- | These functions are used to parse the anti-quotations.  They're
      -- exposed for testing purposes, you really should not use them.
    , SomeEq
    , toSomeEq
    , fromSomeEq
    , ParameterType(..)
    , ParseTypedC(..)
    , parseTypedC
    , runParserInQ
    , splitTypedC

      -- * Line directives
    , lineDirective
    , here
    , shiftLines

      -- * Utility functions for writing quasiquoters
    , genericQuote
    , funPtrQuote
    ) where

import           Control.Applicative
import           Control.Monad (forM, void, msum)
import           Control.Monad.State (evalStateT, StateT, get, put)
import           Control.Monad.Trans.Class (lift)
import           Data.Foldable (forM_)
import qualified Data.Map as Map
import           Data.Maybe (fromMaybe, isJust)
import           Data.Traversable (for)
import           Data.Typeable (Typeable, cast)
import qualified Language.Haskell.TH as TH
import qualified Language.Haskell.TH.Quote as TH
import qualified Language.Haskell.TH.Syntax as TH
import           System.Environment (lookupEnv)
import           System.IO.Unsafe (unsafePerformIO, unsafeDupablePerformIO)
import qualified Text.Parsec as Parsec
import qualified Text.Parsec.Pos as Parsec
import qualified Text.Parser.Char as Parser
import qualified Text.Parser.Combinators as Parser
import qualified Text.Parser.LookAhead as Parser
import qualified Text.Parser.Token as Parser
import           Prettyprinter ((<+>))
import qualified Prettyprinter as PP
import qualified Prettyprinter.Render.String as PP
import qualified Data.List as L
import qualified Data.Char as C
import           Data.Hashable (Hashable)
import           Foreign.Ptr (FunPtr)
import qualified Data.Map as M

-- We cannot use getQ/putQ before 7.10.3 because of <https://ghc.haskell.org/trac/ghc/ticket/10596>
#define USE_GETQ (__GLASGOW_HASKELL__ > 710 || (__GLASGOW_HASKELL__ == 710 && __GLASGOW_HASKELL_PATCHLEVEL1__ >= 3))

#if !USE_GETQ
import           Control.Concurrent.MVar (MVar, newMVar, modifyMVar_, readMVar)
#endif

import           Language.C.Inline.Context
import           Language.C.Inline.FunPtr
import           Language.C.Inline.HaskellIdentifier
import qualified Language.C.Types as C

data ModuleState = ModuleState
  { ModuleState -> Context
msContext :: Context
  , ModuleState -> Int
msGeneratedNames :: Int
  , ModuleState -> [String]
msFileChunks :: [String]
  } deriving (Typeable)

getModuleState :: TH.Q (Maybe ModuleState)
putModuleState :: ModuleState -> TH.Q ()

#if USE_GETQ

getModuleState :: Q (Maybe ModuleState)
getModuleState = forall a. Typeable a => Q (Maybe a)
TH.getQ
putModuleState :: ModuleState -> Q ()
putModuleState = forall a. Typeable a => a -> Q ()
TH.putQ

#else

-- | Identifier for the current module.  Currently we use the file name.
-- Since we're pairing Haskell files with C files, it makes more sense
-- to use the file name.  I'm not sure if it's possible to compile two
-- modules with the same name in one run of GHC, but in this way we make
-- sure that we don't run into trouble even it is.
type ModuleId = String

getModuleId :: TH.Q ModuleId
getModuleId = TH.loc_filename <$> TH.location

-- | 'MVar' storing the state for all the modules we visited.  Note that
-- currently we do not bother with cleaning up the state after we're
-- done compiling a module.  TODO if there is an easy way, clean up the
-- state.
{-# NOINLINE moduleStatesVar #-}
moduleStatesVar :: MVar (Map.Map ModuleId ModuleState)
moduleStatesVar = unsafePerformIO $ newMVar Map.empty

getModuleState = do
  moduleStates <- TH.runIO (readMVar moduleStatesVar)
  moduleId <- getModuleId
  return (Map.lookup moduleId moduleStates)

putModuleState ms = do
  moduleId <- getModuleId
  TH.runIO (modifyMVar_ moduleStatesVar (return . Map.insert moduleId ms))

#endif


-- | Make sure that 'moduleStatesVar' and the respective C file are up
--   to date.
initialiseModuleState
  :: Maybe Context
  -- ^ The 'Context' to use if we initialise the module.  If 'Nothing',
  -- 'baseCtx' will be used.
  -> TH.Q Context
initialiseModuleState :: Maybe Context -> Q Context
initialiseModuleState Maybe Context
mbContext = do
  Maybe ModuleState
mbModuleState <- Q (Maybe ModuleState)
getModuleState
  case Maybe ModuleState
mbModuleState of
    Just ModuleState
moduleState -> forall (m :: * -> *) a. Monad m => a -> m a
return (ModuleState -> Context
msContext ModuleState
moduleState)
    Maybe ModuleState
Nothing -> do
      -- Add hook to add the file
      Q () -> Q ()
TH.addModFinalizer forall a b. (a -> b) -> a -> b
$ do
        Maybe ModuleState
mbMs <- Q (Maybe ModuleState)
getModuleState
        ModuleState
ms <- case Maybe ModuleState
mbMs of
          Maybe ModuleState
Nothing -> forall (m :: * -> *) a. MonadFail m => String -> m a
fail String
"inline-c: ModuleState not present (initialiseModuleState)"
          Just ModuleState
ms -> forall (m :: * -> *) a. Monad m => a -> m a
return ModuleState
ms
        let lang :: ForeignSrcLang
lang = forall a. a -> Maybe a -> a
fromMaybe ForeignSrcLang
TH.LangC (Context -> Maybe ForeignSrcLang
ctxForeignSrcLang Context
context)
            addForeignSource :: ForeignSrcLang -> String -> Q ()
addForeignSource =
#if MIN_VERSION_base(4,12,0)
              ForeignSrcLang -> String -> Q ()
TH.addForeignSource
#else
              TH.addForeignFile
#endif
            src :: String
src = (forall (t :: * -> *) a. Foldable t => t [a] -> [a]
concat (forall a. [a] -> [a]
reverse (ModuleState -> [String]
msFileChunks ModuleState
ms)))
        case (ForeignSrcLang
lang, Context -> Maybe (String -> Q String)
ctxRawObjectCompile Context
context) of
          (ForeignSrcLang
TH.RawObject, Just String -> Q String
compile) -> String -> Q String
compile String
src forall (m :: * -> *) a b. Monad m => m a -> (a -> m b) -> m b
>>= ForeignSrcLang -> String -> Q ()
TH.addForeignFilePath ForeignSrcLang
lang
          (ForeignSrcLang
_, Maybe (String -> Q String)
_)  -> ForeignSrcLang -> String -> Q ()
addForeignSource ForeignSrcLang
lang String
src
      let moduleState :: ModuleState
moduleState = ModuleState
            { msContext :: Context
msContext = Context
context
            , msGeneratedNames :: Int
msGeneratedNames = Int
0
            , msFileChunks :: [String]
msFileChunks = forall a. Monoid a => a
mempty
            }
      ModuleState -> Q ()
putModuleState ModuleState
moduleState
      forall (m :: * -> *) a. Monad m => a -> m a
return Context
context
  where
    context :: Context
context = forall a. a -> Maybe a -> a
fromMaybe Context
baseCtx Maybe Context
mbContext

-- | Gets the current 'Context'.  Also makes sure that the current
-- module is initialised.
getContext :: TH.Q Context
getContext :: Q Context
getContext = Maybe Context -> Q Context
initialiseModuleState forall a. Maybe a
Nothing

modifyModuleState :: (ModuleState -> (ModuleState, a)) -> TH.Q a
modifyModuleState :: forall a. (ModuleState -> (ModuleState, a)) -> Q a
modifyModuleState ModuleState -> (ModuleState, a)
f = do
  Maybe ModuleState
mbModuleState <- Q (Maybe ModuleState)
getModuleState
  case Maybe ModuleState
mbModuleState of
    Maybe ModuleState
Nothing -> forall (m :: * -> *) a. MonadFail m => String -> m a
fail String
"inline-c: ModuleState not present (modifyModuleState)"
    Just ModuleState
ms -> do
      let (ModuleState
ms', a
x) = ModuleState -> (ModuleState, a)
f ModuleState
ms
      ModuleState -> Q ()
putModuleState ModuleState
ms'
      forall (m :: * -> *) a. Monad m => a -> m a
return a
x

-- $context
--
-- The inline C functions ('cexp', 'c', etc.) need a 'Context' to
-- operate.  Said context can be explicitely set with 'setContext'.
-- Otherwise, at the first usage of one of the TH functions in this
-- module the 'Context' is implicitely set to 'baseCtx'.

-- | Sets the 'Context' for the current module.  This function, if
-- called, must be called before any of the other TH functions in this
-- module.  Fails if that's not the case.
setContext :: Context -> TH.Q ()
setContext :: Context -> Q ()
setContext Context
ctx = do
  Maybe ModuleState
mbModuleState <- Q (Maybe ModuleState)
getModuleState
  forall (t :: * -> *) (m :: * -> *) a b.
(Foldable t, Monad m) =>
t a -> (a -> m b) -> m ()
forM_ Maybe ModuleState
mbModuleState forall a b. (a -> b) -> a -> b
$ \ModuleState
_ms ->
    forall (m :: * -> *) a. MonadFail m => String -> m a
fail String
"inline-c: The module has already been initialised (setContext)."
  forall (f :: * -> *) a. Functor f => f a -> f ()
void forall a b. (a -> b) -> a -> b
$ Maybe Context -> Q Context
initialiseModuleState forall a b. (a -> b) -> a -> b
$ forall a. a -> Maybe a
Just Context
ctx

bumpGeneratedNames :: TH.Q Int
bumpGeneratedNames :: Q Int
bumpGeneratedNames = do
  forall a. (ModuleState -> (ModuleState, a)) -> Q a
modifyModuleState forall a b. (a -> b) -> a -> b
$ \ModuleState
ms ->
    let c' :: Int
c' = ModuleState -> Int
msGeneratedNames ModuleState
ms
    in (ModuleState
ms{msGeneratedNames :: Int
msGeneratedNames = Int
c' forall a. Num a => a -> a -> a
+ Int
1}, Int
c')

------------------------------------------------------------------------
-- Emitting

-- | Simply appends some string to the module's C file.  Use with care.
emitVerbatim :: String -> TH.DecsQ
emitVerbatim :: String -> DecsQ
emitVerbatim String
s = do
  -- Make sure that the 'ModuleState' is initialized
  forall (f :: * -> *) a. Functor f => f a -> f ()
void (Maybe Context -> Q Context
initialiseModuleState forall a. Maybe a
Nothing)
  let chunk :: String
chunk = String
"\n" forall a. [a] -> [a] -> [a]
++ String
s forall a. [a] -> [a] -> [a]
++ String
"\n"
  forall a. (ModuleState -> (ModuleState, a)) -> Q a
modifyModuleState forall a b. (a -> b) -> a -> b
$ \ModuleState
ms ->
    (ModuleState
ms{msFileChunks :: [String]
msFileChunks = String
chunk forall a. a -> [a] -> [a]
: ModuleState -> [String]
msFileChunks ModuleState
ms}, ())
  forall (m :: * -> *) a. Monad m => a -> m a
return []

-- | Simply appends some string of block to the module's C file.  Use with care.
emitBlock :: TH.QuasiQuoter
emitBlock :: QuasiQuoter
emitBlock = TH.QuasiQuoter
  { quoteExp :: String -> Q Exp
TH.quoteExp = forall a b. a -> b -> a
const forall a b. (a -> b) -> a -> b
$ forall (m :: * -> *) a. MonadFail m => String -> m a
fail String
"inline-c: quoteExp not implemented (quoteCode)"
  , quotePat :: String -> Q Pat
TH.quotePat = forall a b. a -> b -> a
const forall a b. (a -> b) -> a -> b
$ forall (m :: * -> *) a. MonadFail m => String -> m a
fail String
"inline-c: quotePat not implemented (quoteCode)"
  , quoteType :: String -> Q Type
TH.quoteType = forall a b. a -> b -> a
const forall a b. (a -> b) -> a -> b
$ forall (m :: * -> *) a. MonadFail m => String -> m a
fail String
"inline-c: quoteType not implemented (quoteCode)"
  , quoteDec :: String -> DecsQ
TH.quoteDec = String -> DecsQ
emitVerbatim
  }

------------------------------------------------------------------------
-- Inlining

-- $embedding
--
-- We use the 'Code' data structure to represent some C code that we
-- want to emit to the module's C file and immediately generate a
-- foreign call to.  For this reason, 'Code' includes both some C
-- definition, and enough information to be able to generate a foreign
-- call -- specifically the name of the function to call and the Haskell
-- type.
--
-- All the quasi-quoters work by constructing a 'Code' and calling
-- 'inlineCode'.

-- | Data type representing a list of C definitions with a typed and named entry
-- function.
--
-- We use it as a basis to inline and call C code.
data Code = Code
  { Code -> Safety
codeCallSafety :: TH.Safety
    -- ^ Safety of the foreign call.
  , Code -> Maybe Loc
codeLoc :: Maybe TH.Loc
    -- ^ The haskell source location used for the #line directive
  , Code -> Q Type
codeType :: TH.TypeQ
    -- ^ Type of the foreign call.
  , Code -> String
codeFunName :: String
    -- ^ Name of the function to call in the code below.
  , Code -> String
codeDefs :: String
    -- ^ The C code.
  , Code -> Bool
codeFunPtr :: Bool
    -- ^ If 'True', the type will be wrapped in 'FunPtr', and
    -- the call will be static (e.g. prefixed by &).
  }

-- TODO use the #line CPP macro to have the functions in the C file
-- refer to the source location in the Haskell file they come from.
--
-- See <https://gcc.gnu.org/onlinedocs/cpp/Line-Control.html>.

-- | Inlines a piece of code inline.  The resulting 'TH.Exp' will have
-- the type specified in the 'codeType'.
--
-- In practice, this function outputs the C code to the module's C file,
-- and then inserts a foreign call of type 'codeType' calling the
-- provided 'codeFunName'.
--
-- Example:
--
-- @
-- c_add :: Int -> Int -> Int
-- c_add = $(do
--   here <- TH.location
--   inlineCode $ Code
--     TH.Unsafe                   -- Call safety
--     (Just here)
--     [t| Int -> Int -> Int |]    -- Call type
--     "francescos_add"            -- Call name
--     -- C Code
--     \"int francescos_add(int x, int y) { int z = x + y; return z; }\")
-- @
inlineCode :: Code -> TH.ExpQ
inlineCode :: Code -> Q Exp
inlineCode Code{Bool
String
Maybe Loc
Q Type
Safety
codeFunPtr :: Bool
codeDefs :: String
codeFunName :: String
codeType :: Q Type
codeLoc :: Maybe Loc
codeCallSafety :: Safety
codeFunPtr :: Code -> Bool
codeDefs :: Code -> String
codeFunName :: Code -> String
codeType :: Code -> Q Type
codeLoc :: Code -> Maybe Loc
codeCallSafety :: Code -> Safety
..} = do
  -- Write out definitions
  Context
ctx <- Q Context
getContext
  let out :: String -> String
out = forall a. a -> Maybe a -> a
fromMaybe forall a. a -> a
id forall a b. (a -> b) -> a -> b
$ Context -> Maybe (String -> String)
ctxOutput Context
ctx
  let directive :: String
directive = forall b a. b -> (a -> b) -> Maybe a -> b
maybe String
"" Loc -> String
lineDirective Maybe Loc
codeLoc
  forall (f :: * -> *) a. Functor f => f a -> f ()
void forall a b. (a -> b) -> a -> b
$ String -> DecsQ
emitVerbatim forall a b. (a -> b) -> a -> b
$ String -> String
out forall a b. (a -> b) -> a -> b
$ String
directive forall a. [a] -> [a] -> [a]
++ String
codeDefs
  -- Create and add the FFI declaration.
  Name
ffiImportName <- Q Name
uniqueFfiImportName
  -- Note [ghcide-support]
  -- haskell-language-server / ghcide cannot handle code that use
  -- `addForeignFile`/`addForeignSource` as we do here; it will result
  -- in linker errors during TH evaluations, see:
  -- <https://github.com/haskell/haskell-language-server/issues/365#issuecomment-976294466>
  -- Thus for GHCIDE, simply generate a call to `error` instead of a call to a foreign import.
  Bool
usingGhcide <- forall a. IO a -> Q a
TH.runIO forall a b. (a -> b) -> a -> b
$ forall a. Maybe a -> Bool
isJust forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> String -> IO (Maybe String)
lookupEnv String
"__GHCIDE__"
  if Bool
usingGhcide
    then do
      [e|error "inline-c: A 'usingGhcide' inlineCode stub was evaluated -- this should not happen" :: $(if codeFunPtr then [t| FunPtr $(codeType) |] else codeType) |]
    else do -- Actual foreign function call generation.
      Dec
dec <- if Bool
codeFunPtr
        then forall (m :: * -> *).
Quote m =>
Callconv -> Safety -> String -> Name -> m Type -> m Dec
TH.forImpD Callconv
TH.CCall Safety
codeCallSafety (String
"&" forall a. [a] -> [a] -> [a]
++ String
codeFunName) Name
ffiImportName [t| FunPtr $(codeType) |]
        else forall (m :: * -> *).
Quote m =>
Callconv -> Safety -> String -> Name -> m Type -> m Dec
TH.forImpD Callconv
TH.CCall Safety
codeCallSafety String
codeFunName Name
ffiImportName Q Type
codeType
      [Dec] -> Q ()
TH.addTopDecls [Dec
dec]
      forall (m :: * -> *). Quote m => Name -> m Exp
TH.varE Name
ffiImportName

uniqueCName :: Maybe String -> TH.Q String
uniqueCName :: Maybe String -> Q String
uniqueCName Maybe String
mbPostfix = do
  -- The name looks like this:
  -- inline_c_MODULE_INDEX_POSTFIX
  --
  -- Where:
  --  * MODULE is the module name but with _s instead of .s;
  --  * INDEX is a counter that keeps track of how many names we're generating
  --    for each module.
  --  * POSTFIX is an optional postfix to ease debuggability
  --
  -- we previously also generated a hash from the contents of the
  -- C code because of problems when cabal recompiled but now this
  -- is not needed anymore since we use 'addDependentFile' to compile
  -- the C code.
  Int
c' <- Q Int
bumpGeneratedNames
  String
module_ <- Loc -> String
TH.loc_module forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> Q Loc
TH.location
  let replaceDot :: Char -> Char
replaceDot Char
'.' = Char
'_'
      replaceDot Char
c = Char
c
  let postfix :: String
postfix = case Maybe String
mbPostfix of
        Maybe String
Nothing -> String
""
        Just String
s -> String
"_" forall a. [a] -> [a] -> [a]
++ String
s forall a. [a] -> [a] -> [a]
++ String
"_"
  forall (m :: * -> *) a. Monad m => a -> m a
return forall a b. (a -> b) -> a -> b
$ String
"inline_c_" forall a. [a] -> [a] -> [a]
++ forall a b. (a -> b) -> [a] -> [b]
map Char -> Char
replaceDot String
module_ forall a. [a] -> [a] -> [a]
++ String
"_" forall a. [a] -> [a] -> [a]
++ forall a. Show a => a -> String
show Int
c' forall a. [a] -> [a] -> [a]
++ String
postfix

-- | Same as 'inlineCItems', but with a single expression.
--
-- @
-- c_cos :: Double -> Double
-- c_cos = $(do
--   here <- TH.location
--   inlineExp
--     TH.Unsafe
--     here
--     [t| Double -> Double |]
--     (quickCParser_ \"double\" parseType)
--     [("x", quickCParser_ \"double\" parseType)]
--     "cos(x)")
-- @
inlineExp
  :: TH.Safety
  -- ^ Safety of the foreign call
  -> TH.Loc
  -- ^ The location to report
  -> TH.TypeQ
  -- ^ Type of the foreign call
  -> C.Type C.CIdentifier
  -- ^ Return type of the C expr
  -> [(C.CIdentifier, C.Type C.CIdentifier)]
  -- ^ Parameters of the C expr
  -> String
  -- ^ The C expression
  -> TH.ExpQ
inlineExp :: Safety
-> Loc
-> Q Type
-> Type CIdentifier
-> [(CIdentifier, Type CIdentifier)]
-> String
-> Q Exp
inlineExp Safety
callSafety Loc
loc Q Type
type_ Type CIdentifier
cRetType [(CIdentifier, Type CIdentifier)]
cParams String
cExp =
  Safety
-> Bool
-> Maybe String
-> Loc
-> Q Type
-> Type CIdentifier
-> [(CIdentifier, Type CIdentifier)]
-> String
-> Q Exp
inlineItems Safety
callSafety Bool
False forall a. Maybe a
Nothing Loc
loc Q Type
type_ Type CIdentifier
cRetType [(CIdentifier, Type CIdentifier)]
cParams String
cItems
  where
    cItems :: String
cItems = case Type CIdentifier
cRetType of
      C.TypeSpecifier Specifiers
_quals TypeSpecifier
C.Void -> String
cExp forall a. [a] -> [a] -> [a]
++ String
";"
      Type CIdentifier
_ -> String
"return (" forall a. [a] -> [a] -> [a]
++ String
cExp forall a. [a] -> [a] -> [a]
++ String
");"

-- | Same as 'inlineCode', but accepts a string containing a list of C
-- statements instead instead than a full-blown 'Code'.  A function
-- containing the provided statement will be automatically generated.
--
-- @
-- c_cos :: Double -> Double
-- c_cos = $(do
--  here <- TH.location
--  inlineItems
--   TH.Unsafe
--   False
--   Nothing
--   here
--   [t| Double -> Double |]
--   (quickCParser_ \"double\" parseType)
--   [("x", quickCParser_ \"double\" parseType)]
--   "return cos(x);")
-- @
inlineItems
  :: TH.Safety
  -- ^ Safety of the foreign call
  -> Bool
  -- ^ Whether to return as a FunPtr or not
  -> Maybe String
  -- ^ Optional postfix for the generated name
  -> TH.Loc
  -- ^ The location to report
  -> TH.TypeQ
  -- ^ Type of the foreign call
  -> C.Type C.CIdentifier
  -- ^ Return type of the C expr
  -> [(C.CIdentifier, C.Type C.CIdentifier)]
  -- ^ Parameters of the C expr
  -> String
  -- ^ The C items
  -> TH.ExpQ
inlineItems :: Safety
-> Bool
-> Maybe String
-> Loc
-> Q Type
-> Type CIdentifier
-> [(CIdentifier, Type CIdentifier)]
-> String
-> Q Exp
inlineItems Safety
callSafety Bool
funPtr Maybe String
mbPostfix Loc
loc Q Type
type_ Type CIdentifier
cRetType [(CIdentifier, Type CIdentifier)]
cParams String
cItems = do
  let mkParam :: (i, Type i) -> ParameterDeclaration i
mkParam (i
id', Type i
paramTy) = forall i. Maybe i -> Type i -> ParameterDeclaration i
C.ParameterDeclaration (forall a. a -> Maybe a
Just i
id') Type i
paramTy
  let proto :: Type CIdentifier
proto = forall i. Type i -> [ParameterDeclaration i] -> Type i
C.Proto Type CIdentifier
cRetType (forall a b. (a -> b) -> [a] -> [b]
map forall {i}. (i, Type i) -> ParameterDeclaration i
mkParam [(CIdentifier, Type CIdentifier)]
cParams)
  Context
ctx <- Q Context
getContext
  String
funName <- Maybe String -> Q String
uniqueCName Maybe String
mbPostfix
  CIdentifier
cFunName <- case Bool -> String -> Either String CIdentifier
C.cIdentifierFromString (Context -> Bool
ctxEnableCpp Context
ctx) String
funName of
    Left String
err -> forall (m :: * -> *) a. MonadFail m => String -> m a
fail forall a b. (a -> b) -> a -> b
$ String
"inlineItems: impossible, generated bad C identifier " forall a. [a] -> [a] -> [a]
++
                       String
"funName:\n" forall a. [a] -> [a] -> [a]
++ String
err
    Right CIdentifier
x -> forall (m :: * -> *) a. Monad m => a -> m a
return CIdentifier
x
  let decl :: ParameterDeclaration CIdentifier
decl = forall i. Maybe i -> Type i -> ParameterDeclaration i
C.ParameterDeclaration (forall a. a -> Maybe a
Just CIdentifier
cFunName) Type CIdentifier
proto
  let defs :: String
defs = forall ann. Doc ann -> String
prettyOneLine (forall a ann. Pretty a => a -> Doc ann
PP.pretty ParameterDeclaration CIdentifier
decl) forall a. [a] -> [a] -> [a]
++ String
" { " forall a. [a] -> [a] -> [a]
++ String
cItems forall a. [a] -> [a] -> [a]
++ String
" }\n"
  Code -> Q Exp
inlineCode forall a b. (a -> b) -> a -> b
$ Code
    { codeCallSafety :: Safety
codeCallSafety = Safety
callSafety
    , codeLoc :: Maybe Loc
codeLoc = forall a. a -> Maybe a
Just Loc
loc
    , codeType :: Q Type
codeType = Q Type
type_
    , codeFunName :: String
codeFunName = String
funName
    , codeDefs :: String
codeDefs = String
defs
    , codeFunPtr :: Bool
codeFunPtr = Bool
funPtr
    }

------------------------------------------------------------------------
-- Parsing

runParserInQ
  :: (Hashable ident)
  => String
  -> C.CParserContext ident
  -> (forall m. C.CParser ident m => m a) -> TH.Q a
runParserInQ :: forall ident a.
Hashable ident =>
String
-> CParserContext ident
-> (forall (m :: * -> *). CParser ident m => m a)
-> Q a
runParserInQ String
s CParserContext ident
ctx forall (m :: * -> *). CParser ident m => m a
p = do
  Loc
loc <- Q Loc
TH.location
  let (Int
line, Int
col) = Loc -> (Int, Int)
TH.loc_start Loc
loc
  let parsecLoc :: SourcePos
parsecLoc = String -> Int -> Int -> SourcePos
Parsec.newPos (Loc -> String
TH.loc_filename Loc
loc) Int
line Int
col
  let p' :: ReaderT (CParserContext ident) (ParsecT String () Identity) a
p' = forall (t :: (* -> *) -> * -> *) (m :: * -> *) a.
(MonadTrans t, Monad m) =>
m a -> t m a
lift (forall (m :: * -> *) s u. Monad m => SourcePos -> ParsecT s u m ()
Parsec.setPosition SourcePos
parsecLoc) forall (f :: * -> *) a b. Applicative f => f a -> f b -> f b
*> forall (m :: * -> *). CParser ident m => m a
p forall (f :: * -> *) a b. Applicative f => f a -> f b -> f a
<* forall (t :: (* -> *) -> * -> *) (m :: * -> *) a.
(MonadTrans t, Monad m) =>
m a -> t m a
lift forall (m :: * -> *). Parsing m => m ()
Parser.eof
  case forall s i a.
Stream s Identity Char =>
CParserContext i
-> String
-> s
-> ReaderT (CParserContext i) (Parsec s ()) a
-> Either ParseError a
C.runCParser CParserContext ident
ctx (Loc -> String
TH.loc_filename Loc
loc) String
s ReaderT (CParserContext ident) (ParsecT String () Identity) a
p' of
    Left ParseError
err -> do
      -- TODO consider prefixing with "error while parsing C" or similar
      forall (m :: * -> *) a. MonadFail m => String -> m a
fail forall a b. (a -> b) -> a -> b
$ forall a. Show a => a -> String
show ParseError
err
    Right a
res -> do
      forall (m :: * -> *) a. Monad m => a -> m a
return a
res

data SomeEq = forall a. (Typeable a, Eq a) => SomeEq a

instance Eq SomeEq where
  SomeEq a
x == :: SomeEq -> SomeEq -> Bool
== SomeEq a
y = case forall a b. (Typeable a, Typeable b) => a -> Maybe b
cast a
x of
    Maybe a
Nothing -> Bool
False
    Just a
x' -> a
x' forall a. Eq a => a -> a -> Bool
== a
y

instance Show SomeEq where
  show :: SomeEq -> String
show SomeEq
_ = String
"<<SomeEq>>"

toSomeEq :: (Eq a, Typeable a) => a -> SomeEq
toSomeEq :: forall a. (Eq a, Typeable a) => a -> SomeEq
toSomeEq a
x = forall a. (Typeable a, Eq a) => a -> SomeEq
SomeEq a
x

fromSomeEq :: (Eq a, Typeable a) => SomeEq -> Maybe a
fromSomeEq :: forall a. (Eq a, Typeable a) => SomeEq -> Maybe a
fromSomeEq (SomeEq a
x) = forall a b. (Typeable a, Typeable b) => a -> Maybe b
cast a
x

data ParameterType
  = Plain HaskellIdentifier                -- The name of the captured variable
  | AntiQuote AntiQuoterId SomeEq
  deriving (Int -> ParameterType -> String -> String
[ParameterType] -> String -> String
ParameterType -> String
forall a.
(Int -> a -> String -> String)
-> (a -> String) -> ([a] -> String -> String) -> Show a
showList :: [ParameterType] -> String -> String
$cshowList :: [ParameterType] -> String -> String
show :: ParameterType -> String
$cshow :: ParameterType -> String
showsPrec :: Int -> ParameterType -> String -> String
$cshowsPrec :: Int -> ParameterType -> String -> String
Show, ParameterType -> ParameterType -> Bool
forall a. (a -> a -> Bool) -> (a -> a -> Bool) -> Eq a
/= :: ParameterType -> ParameterType -> Bool
$c/= :: ParameterType -> ParameterType -> Bool
== :: ParameterType -> ParameterType -> Bool
$c== :: ParameterType -> ParameterType -> Bool
Eq)

data ParseTypedC = ParseTypedC
  { ParseTypedC -> Type CIdentifier
ptcReturnType :: C.Type C.CIdentifier
  , ParseTypedC -> [(CIdentifier, Type CIdentifier, ParameterType)]
ptcParameters :: [(C.CIdentifier, C.Type C.CIdentifier, ParameterType)]
  , ParseTypedC -> String
ptcBody :: String
  }

newtype Substitutions = Substitutions { Substitutions -> Map String (String -> String)
unSubstitutions :: M.Map String (String -> String) }

applySubstitutions :: String -> TH.Q String
applySubstitutions :: String -> Q String
applySubstitutions String
str = do
  Map String (String -> String)
subs <- forall b a. b -> (a -> b) -> Maybe a -> b
maybe forall a. Monoid a => a
mempty Substitutions -> Map String (String -> String)
unSubstitutions forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> forall a. Typeable a => Q (Maybe a)
TH.getQ
  let substitution :: ParsecT String () Identity String
substitution = forall (t :: * -> *) (m :: * -> *) a.
(Foldable t, MonadPlus m) =>
t (m a) -> m a
msum forall a b. (a -> b) -> a -> b
$ forall a b c. (a -> b -> c) -> b -> a -> c
flip forall a b. (a -> b) -> [a] -> [b]
map (forall k a. Map k a -> [(k, a)]
M.toList Map String (String -> String)
subs) forall a b. (a -> b) -> a -> b
$ \( String
subName, String -> String
subFunc ) ->
        forall s u (m :: * -> *) a. ParsecT s u m a -> ParsecT s u m a
Parsec.try forall a b. (a -> b) -> a -> b
$ do
          String
_ <- forall s (m :: * -> *) u.
Stream s m Char =>
String -> ParsecT s u m String
Parsec.string (Char
'@' forall a. a -> [a] -> [a]
: String
subName forall a. [a] -> [a] -> [a]
++ String
"(")
          String
subArg <- forall s (m :: * -> *) t u a end.
Stream s m t =>
ParsecT s u m a -> ParsecT s u m end -> ParsecT s u m [a]
Parsec.manyTill forall s (m :: * -> *) u. Stream s m Char => ParsecT s u m Char
Parsec.anyChar (forall s (m :: * -> *) u.
Stream s m Char =>
Char -> ParsecT s u m Char
Parsec.char Char
')')
          forall (m :: * -> *) a. Monad m => a -> m a
return (String -> String
subFunc String
subArg)
  let someChar :: ParsecT String u Identity String
someChar = (forall a. a -> [a] -> [a]
:[]) forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> forall s (m :: * -> *) u. Stream s m Char => ParsecT s u m Char
Parsec.anyChar
  case forall s t a.
Stream s Identity t =>
Parsec s () a -> String -> s -> Either ParseError a
Parsec.parse (forall (f :: * -> *) a. Alternative f => f a -> f [a]
many (ParsecT String () Identity String
substitution forall (f :: * -> *) a. Alternative f => f a -> f a -> f a
<|> forall {u}. ParsecT String u Identity String
someChar)) String
"" String
str of
    Left ParseError
_ -> forall (m :: * -> *) a. MonadFail m => String -> m a
fail String
"Substitution failed (should be impossible)"
    Right [String]
chunks -> forall (m :: * -> *) a. Monad m => a -> m a
return (forall (t :: * -> *) a. Foldable t => t [a] -> [a]
concat [String]
chunks)

-- | Define macros that can be used in the nested Template Haskell expression.
-- Macros can be used as @\@MACRO_NAME(input)@ in inline-c quotes, and will transform their input with the given function.
-- They can be useful for passing in types when defining Haskell instances for C++ template types.
substitute :: [ ( String, String -> String ) ] -> TH.Q a -> TH.Q a
substitute :: forall a. [(String, String -> String)] -> Q a -> Q a
substitute [(String, String -> String)]
subsList Q a
cont = do
  Map String (String -> String)
oldSubs <- forall b a. b -> (a -> b) -> Maybe a -> b
maybe forall a. Monoid a => a
mempty Substitutions -> Map String (String -> String)
unSubstitutions forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> forall a. Typeable a => Q (Maybe a)
TH.getQ
  let subs :: Map String (String -> String)
subs = forall k a. Ord k => [(k, a)] -> Map k a
M.fromList [(String, String -> String)]
subsList
  let conflicting :: Map String (String -> String)
conflicting = forall k a b. Ord k => Map k a -> Map k b -> Map k a
M.intersection Map String (String -> String)
subs Map String (String -> String)
oldSubs
  Substitutions
newSubs <-
    if forall k a. Map k a -> Bool
M.null Map String (String -> String)
conflicting
      then forall (m :: * -> *) a. Monad m => a -> m a
return (Map String (String -> String) -> Substitutions
Substitutions (forall k a. Ord k => Map k a -> Map k a -> Map k a
M.union Map String (String -> String)
oldSubs Map String (String -> String)
subs))
      else forall (m :: * -> *) a. MonadFail m => String -> m a
fail (String
"Conflicting substitutions `" forall a. [a] -> [a] -> [a]
++ forall a. Show a => a -> String
show (forall k a. Map k a -> [k]
M.keys Map String (String -> String)
conflicting) forall a. [a] -> [a] -> [a]
++ String
"`")
  forall a. Typeable a => a -> Q ()
TH.putQ Substitutions
newSubs forall (f :: * -> *) a b. Applicative f => f a -> f b -> f b
*> Q a
cont forall (f :: * -> *) a b. Applicative f => f a -> f b -> f a
<* forall a. Typeable a => a -> Q ()
TH.putQ (Map String (String -> String) -> Substitutions
Substitutions Map String (String -> String)
oldSubs)

-- | Given a C type name, return the Haskell type in Template Haskell. The first parameter controls whether function pointers
-- should be mapped as pure or IO functions.
getHaskellType :: Bool -> String -> TH.TypeQ
getHaskellType :: Bool -> String -> Q Type
getHaskellType Bool
pureFunctions String
cTypeStr = do
  Context
ctx <- Q Context
getContext
  let cParseCtx :: CParserContext CIdentifier
cParseCtx = Bool -> TypeNames -> CParserContext CIdentifier
C.cCParserContext (Context -> Bool
ctxEnableCpp Context
ctx) (TypesTable -> TypeNames
typeNamesFromTypesTable (Context -> TypesTable
ctxTypesTable Context
ctx))
  Type CIdentifier
cType <- forall ident a.
Hashable ident =>
String
-> CParserContext ident
-> (forall (m :: * -> *). CParser ident m => m a)
-> Q a
runParserInQ String
cTypeStr CParserContext CIdentifier
cParseCtx forall i (m :: * -> *). (CParser i m, Pretty i) => m (Type i)
C.parseType
  Context -> Purity -> Type CIdentifier -> Q Type
cToHs Context
ctx (if Bool
pureFunctions then Purity
Pure else Purity
IO) Type CIdentifier
cType

-- To parse C declarations, we're faced with a bit of a problem: we want
-- to parse the anti-quotations so that Haskell identifiers are
-- accepted, but we want them to appear only as the root of
-- declarations.  For this reason, we parse allowing Haskell identifiers
-- everywhere, and then we "purge" Haskell identifiers everywhere but at
-- the root.
parseTypedC
  :: forall m. C.CParser HaskellIdentifier m
  => Bool -> AntiQuoters -> m ParseTypedC
  -- ^ Returns the return type, the captured variables, and the body.
parseTypedC :: forall (m :: * -> *).
CParser HaskellIdentifier m =>
Bool -> AntiQuoters -> m ParseTypedC
parseTypedC Bool
useCpp AntiQuoters
antiQs = do
  -- Parse return type (consume spaces first)
  forall (m :: * -> *). CharParsing m => m ()
Parser.spaces
  Type CIdentifier
cRetType <- forall (n :: * -> *).
MonadFail n =>
Type HaskellIdentifier -> n (Type CIdentifier)
purgeHaskellIdentifiers forall (m :: * -> *) a b. Monad m => (a -> m b) -> m a -> m b
=<< forall i (m :: * -> *). (CParser i m, Pretty i) => m (Type i)
C.parseType
  -- Parse the body
  forall (f :: * -> *) a. Functor f => f a -> f ()
void forall a b. (a -> b) -> a -> b
$ forall (m :: * -> *). CharParsing m => Char -> m Char
Parser.char Char
'{'
  ([(CIdentifier, Type CIdentifier, ParameterType)]
cParams, String
cBody) <- forall (m :: * -> *) s a. Monad m => StateT s m a -> s -> m a
evalStateT StateT
  Int m ([(CIdentifier, Type CIdentifier, ParameterType)], String)
parseBody Int
0
  forall (m :: * -> *) a. Monad m => a -> m a
return forall a b. (a -> b) -> a -> b
$ Type CIdentifier
-> [(CIdentifier, Type CIdentifier, ParameterType)]
-> String
-> ParseTypedC
ParseTypedC Type CIdentifier
cRetType [(CIdentifier, Type CIdentifier, ParameterType)]
cParams String
cBody
  where
    parseBody
      :: StateT Int m ([(C.CIdentifier, C.Type C.CIdentifier, ParameterType)], String)
    parseBody :: StateT
  Int m ([(CIdentifier, Type CIdentifier, ParameterType)], String)
parseBody = do
      -- Note that this code does not use "lexing" combinators (apart
      -- when appropriate) because we want to make sure to preserve
      -- whitespace after we substitute things.
      String
s <- forall (m :: * -> *) a end. Alternative m => m a -> m end -> m [a]
Parser.manyTill forall (m :: * -> *). CharParsing m => m Char
Parser.anyChar forall a b. (a -> b) -> a -> b
$
           forall (m :: * -> *) a. LookAheadParsing m => m a -> m a
Parser.lookAhead (forall (m :: * -> *). CharParsing m => Char -> m Char
Parser.char Char
'}' forall (f :: * -> *) a. Alternative f => f a -> f a -> f a
<|> forall (m :: * -> *). CharParsing m => Char -> m Char
Parser.char Char
'$')
      ([(CIdentifier, Type CIdentifier, ParameterType)]
decls, String
s') <- forall (t :: * -> *) (m :: * -> *) a.
(Foldable t, MonadPlus m) =>
t (m a) -> m a
msum
        [ do forall (m :: * -> *) a. Parsing m => m a -> m a
Parser.try forall a b. (a -> b) -> a -> b
$ do -- Try because we might fail to parse the 'eof'
                -- 'symbolic' because we want to consume whitespace
               forall (f :: * -> *) a. Functor f => f a -> f ()
void forall a b. (a -> b) -> a -> b
$ forall (m :: * -> *). TokenParsing m => Char -> m Char
Parser.symbolic Char
'}'
               forall (m :: * -> *). Parsing m => m ()
Parser.eof
             forall (m :: * -> *) a. Monad m => a -> m a
return ([], String
"")
        , do forall (f :: * -> *) a. Functor f => f a -> f ()
void forall a b. (a -> b) -> a -> b
$ forall (m :: * -> *). CharParsing m => Char -> m Char
Parser.char Char
'}'
             ([(CIdentifier, Type CIdentifier, ParameterType)]
decls, String
s') <- StateT
  Int m ([(CIdentifier, Type CIdentifier, ParameterType)], String)
parseBody
             forall (m :: * -> *) a. Monad m => a -> m a
return ([(CIdentifier, Type CIdentifier, ParameterType)]
decls, String
"}" forall a. [a] -> [a] -> [a]
++ String
s')
        , do forall (f :: * -> *) a. Functor f => f a -> f ()
void forall a b. (a -> b) -> a -> b
$ forall (m :: * -> *). CharParsing m => Char -> m Char
Parser.char Char
'$'
             ([(CIdentifier, Type CIdentifier, ParameterType)]
decls1, String
s1) <- forall a. StateT Int m ([a], String)
parseEscapedDollar forall (f :: * -> *) a. Alternative f => f a -> f a -> f a
<|> StateT
  Int m ([(CIdentifier, Type CIdentifier, ParameterType)], String)
parseAntiQuote forall (f :: * -> *) a. Alternative f => f a -> f a -> f a
<|> StateT
  Int m ([(CIdentifier, Type CIdentifier, ParameterType)], String)
parseTypedCapture
             ([(CIdentifier, Type CIdentifier, ParameterType)]
decls2, String
s2) <- StateT
  Int m ([(CIdentifier, Type CIdentifier, ParameterType)], String)
parseBody
             forall (m :: * -> *) a. Monad m => a -> m a
return ([(CIdentifier, Type CIdentifier, ParameterType)]
decls1 forall a. [a] -> [a] -> [a]
++ [(CIdentifier, Type CIdentifier, ParameterType)]
decls2, String
s1 forall a. [a] -> [a] -> [a]
++ String
s2)
        ]
      forall (m :: * -> *) a. Monad m => a -> m a
return ([(CIdentifier, Type CIdentifier, ParameterType)]
decls, String
s forall a. [a] -> [a] -> [a]
++ String
s')
      where

    parseAntiQuote
      :: StateT Int m ([(C.CIdentifier, C.Type C.CIdentifier, ParameterType)], String)
    parseAntiQuote :: StateT
  Int m ([(CIdentifier, Type CIdentifier, ParameterType)], String)
parseAntiQuote = forall (t :: * -> *) (m :: * -> *) a.
(Foldable t, MonadPlus m) =>
t (m a) -> m a
msum
      [ do forall (f :: * -> *) a. Functor f => f a -> f ()
void forall a b. (a -> b) -> a -> b
$ forall (m :: * -> *) a. Parsing m => m a -> m a
Parser.try (forall (m :: * -> *). CharParsing m => String -> m String
Parser.string forall a b. (a -> b) -> a -> b
$ String
antiQId forall a. [a] -> [a] -> [a]
++ String
":") forall (m :: * -> *) a. Parsing m => m a -> String -> m a
Parser.<?> String
"anti quoter id"
           (CIdentifier
s, Type CIdentifier
cTy, a
x) <- forall a.
AntiQuoter a
-> forall (m :: * -> *).
   CParser HaskellIdentifier m =>
   m (CIdentifier, Type CIdentifier, a)
aqParser AntiQuoter a
antiQ
           CIdentifier
id' <- CIdentifier -> StateT Int m CIdentifier
freshId CIdentifier
s
           forall (m :: * -> *) a. Monad m => a -> m a
return ([(CIdentifier
id', Type CIdentifier
cTy, String -> SomeEq -> ParameterType
AntiQuote String
antiQId (forall a. (Eq a, Typeable a) => a -> SomeEq
toSomeEq a
x))], CIdentifier -> String
C.unCIdentifier CIdentifier
id')
      | (String
antiQId, SomeAntiQuoter AntiQuoter a
antiQ) <- forall k a. Map k a -> [(k, a)]
Map.toList AntiQuoters
antiQs
      ]

    parseEscapedDollar :: StateT Int m ([a], String)
    parseEscapedDollar :: forall a. StateT Int m ([a], String)
parseEscapedDollar = do
      forall (f :: * -> *) a. Functor f => f a -> f ()
void forall a b. (a -> b) -> a -> b
$ forall (m :: * -> *). CharParsing m => Char -> m Char
Parser.char Char
'$'
      forall (m :: * -> *) a. Monad m => a -> m a
return ([], String
"$")

    parseTypedCapture
      :: StateT Int m ([(C.CIdentifier, C.Type C.CIdentifier, ParameterType)], String)
    parseTypedCapture :: StateT
  Int m ([(CIdentifier, Type CIdentifier, ParameterType)], String)
parseTypedCapture = do
      forall (f :: * -> *) a. Functor f => f a -> f ()
void forall a b. (a -> b) -> a -> b
$ forall (m :: * -> *). TokenParsing m => Char -> m Char
Parser.symbolic Char
'('
      ParameterDeclaration HaskellIdentifier
decl <- forall i (m :: * -> *).
(CParser i m, Pretty i) =>
m (ParameterDeclaration i)
C.parseParameterDeclaration
      Type CIdentifier
declType <- forall (n :: * -> *).
MonadFail n =>
Type HaskellIdentifier -> n (Type CIdentifier)
purgeHaskellIdentifiers forall a b. (a -> b) -> a -> b
$ forall i. ParameterDeclaration i -> Type i
C.parameterDeclarationType ParameterDeclaration HaskellIdentifier
decl
      -- Purge the declaration type of all the Haskell identifiers.
      HaskellIdentifier
hId <- case forall i. ParameterDeclaration i -> Maybe i
C.parameterDeclarationId ParameterDeclaration HaskellIdentifier
decl of
        Maybe HaskellIdentifier
Nothing -> forall (m :: * -> *) a. MonadFail m => String -> m a
fail forall a b. (a -> b) -> a -> b
$ forall ann. Doc ann -> String
pretty80 forall a b. (a -> b) -> a -> b
$
          Doc Any
"Un-named captured variable in decl" forall ann. Doc ann -> Doc ann -> Doc ann
<+> forall a ann. Pretty a => a -> Doc ann
PP.pretty ParameterDeclaration HaskellIdentifier
decl
        Just HaskellIdentifier
hId -> forall (m :: * -> *) a. Monad m => a -> m a
return HaskellIdentifier
hId
      CIdentifier
id' <- CIdentifier -> StateT Int m CIdentifier
freshId forall a b. (a -> b) -> a -> b
$ Bool -> HaskellIdentifier -> CIdentifier
mangleHaskellIdentifier Bool
useCpp HaskellIdentifier
hId
      forall (f :: * -> *) a. Functor f => f a -> f ()
void forall a b. (a -> b) -> a -> b
$ forall (m :: * -> *). CharParsing m => Char -> m Char
Parser.char Char
')'
      forall (m :: * -> *) a. Monad m => a -> m a
return ([(CIdentifier
id', Type CIdentifier
declType, HaskellIdentifier -> ParameterType
Plain HaskellIdentifier
hId)], CIdentifier -> String
C.unCIdentifier CIdentifier
id')

    freshId :: CIdentifier -> StateT Int m CIdentifier
freshId CIdentifier
s = do
      Int
c <- forall s (m :: * -> *). MonadState s m => m s
get
      forall s (m :: * -> *). MonadState s m => s -> m ()
put forall a b. (a -> b) -> a -> b
$ Int
c forall a. Num a => a -> a -> a
+ Int
1
      case Bool -> String -> Either String CIdentifier
C.cIdentifierFromString Bool
useCpp (CIdentifier -> String
C.unCIdentifier CIdentifier
s forall a. [a] -> [a] -> [a]
++ String
"_inline_c_" forall a. [a] -> [a] -> [a]
++ forall a. Show a => a -> String
show Int
c) of
        Left String
_err -> forall a. HasCallStack => String -> a
error String
"freshId: The impossible happened"
        Right CIdentifier
x -> forall (m :: * -> *) a. Monad m => a -> m a
return CIdentifier
x

    -- The @m@ is polymorphic because we use this both for the plain
    -- parser and the StateT parser we use above.  We only need 'fail'.
    purgeHaskellIdentifiers
#if MIN_VERSION_base(4,13,0)
      :: forall n. MonadFail n
#else
      :: forall n. (Applicative n, Monad n)
#endif
      => C.Type HaskellIdentifier -> n (C.Type C.CIdentifier)
    purgeHaskellIdentifiers :: forall (n :: * -> *).
MonadFail n =>
Type HaskellIdentifier -> n (Type CIdentifier)
purgeHaskellIdentifiers Type HaskellIdentifier
cTy = forall (t :: * -> *) (f :: * -> *) a b.
(Traversable t, Applicative f) =>
t a -> (a -> f b) -> f (t b)
for Type HaskellIdentifier
cTy forall a b. (a -> b) -> a -> b
$ \HaskellIdentifier
hsIdent -> do
      let hsIdentS :: String
hsIdentS = HaskellIdentifier -> String
unHaskellIdentifier HaskellIdentifier
hsIdent
      case Bool -> String -> Either String CIdentifier
C.cIdentifierFromString Bool
useCpp String
hsIdentS of
        Left String
err -> forall (m :: * -> *) a. MonadFail m => String -> m a
fail forall a b. (a -> b) -> a -> b
$ String
"Haskell identifier " forall a. [a] -> [a] -> [a]
++ String
hsIdentS forall a. [a] -> [a] -> [a]
++ String
" in illegal position" forall a. [a] -> [a] -> [a]
++
                           String
"in C type\n" forall a. [a] -> [a] -> [a]
++ forall ann. Doc ann -> String
pretty80 (forall a ann. Pretty a => a -> Doc ann
PP.pretty Type HaskellIdentifier
cTy) forall a. [a] -> [a] -> [a]
++ String
"\n" forall a. [a] -> [a] -> [a]
++
                           String
"A C identifier was expected, but:\n" forall a. [a] -> [a] -> [a]
++ String
err
        Right CIdentifier
cIdent -> forall (m :: * -> *) a. Monad m => a -> m a
return CIdentifier
cIdent

quoteCode
  :: (String -> TH.ExpQ)
  -- ^ The parser
  -> TH.QuasiQuoter
quoteCode :: (String -> Q Exp) -> QuasiQuoter
quoteCode String -> Q Exp
p = TH.QuasiQuoter
  { quoteExp :: String -> Q Exp
TH.quoteExp = String -> Q Exp
p
  , quotePat :: String -> Q Pat
TH.quotePat = forall a b. a -> b -> a
const forall a b. (a -> b) -> a -> b
$ forall (m :: * -> *) a. MonadFail m => String -> m a
fail String
"inline-c: quotePat not implemented (quoteCode)"
  , quoteType :: String -> Q Type
TH.quoteType = forall a b. a -> b -> a
const forall a b. (a -> b) -> a -> b
$ forall (m :: * -> *) a. MonadFail m => String -> m a
fail String
"inline-c: quoteType not implemented (quoteCode)"
  , quoteDec :: String -> DecsQ
TH.quoteDec = forall a b. a -> b -> a
const forall a b. (a -> b) -> a -> b
$ forall (m :: * -> *) a. MonadFail m => String -> m a
fail String
"inline-c: quoteDec not implemented (quoteCode)"
  }

cToHs :: Context -> Purity -> C.Type C.CIdentifier -> TH.TypeQ
cToHs :: Context -> Purity -> Type CIdentifier -> Q Type
cToHs Context
ctx Purity
purity Type CIdentifier
cTy = do
  Maybe Type
mbHsTy <- Purity -> TypesTable -> Type CIdentifier -> Q (Maybe Type)
convertType Purity
purity (Context -> TypesTable
ctxTypesTable Context
ctx) Type CIdentifier
cTy
  case Maybe Type
mbHsTy of
    Maybe Type
Nothing -> forall (m :: * -> *) a. MonadFail m => String -> m a
fail forall a b. (a -> b) -> a -> b
$ String
"Could not resolve Haskell type for C type " forall a. [a] -> [a] -> [a]
++ forall ann. Doc ann -> String
pretty80 (forall a ann. Pretty a => a -> Doc ann
PP.pretty Type CIdentifier
cTy)
    Just Type
hsTy -> forall (m :: * -> *) a. Monad m => a -> m a
return Type
hsTy

genericQuote
  :: Purity
  -> (TH.Loc -> TH.TypeQ -> C.Type C.CIdentifier -> [(C.CIdentifier, C.Type C.CIdentifier)] -> String -> TH.ExpQ)
  -- ^ Function building an Haskell expression, see 'inlineExp' for
  -- guidance on the other args.
  -> TH.QuasiQuoter
genericQuote :: Purity
-> (Loc
    -> Q Type
    -> Type CIdentifier
    -> [(CIdentifier, Type CIdentifier)]
    -> String
    -> Q Exp)
-> QuasiQuoter
genericQuote Purity
purity Loc
-> Q Type
-> Type CIdentifier
-> [(CIdentifier, Type CIdentifier)]
-> String
-> Q Exp
build = (String -> Q Exp) -> QuasiQuoter
quoteCode forall a b. (a -> b) -> a -> b
$ \String
rawStr -> do
    Context
ctx <- Q Context
getContext
    Loc
here <- Q Loc
TH.location
    String
s <- String -> Q String
applySubstitutions String
rawStr
    ParseTypedC Type CIdentifier
cType [(CIdentifier, Type CIdentifier, ParameterType)]
cParams String
cExp <-
      forall ident a.
Hashable ident =>
String
-> CParserContext ident
-> (forall (m :: * -> *). CParser ident m => m a)
-> Q a
runParserInQ String
s
        (Bool -> TypeNames -> CParserContext HaskellIdentifier
haskellCParserContext (Context -> Bool
ctxEnableCpp Context
ctx) (TypesTable -> TypeNames
typeNamesFromTypesTable (Context -> TypesTable
ctxTypesTable Context
ctx)))
        (forall (m :: * -> *).
CParser HaskellIdentifier m =>
Bool -> AntiQuoters -> m ParseTypedC
parseTypedC (Context -> Bool
ctxEnableCpp Context
ctx) (Context -> AntiQuoters
ctxAntiQuoters Context
ctx))
    Type
hsType <- Context -> Purity -> Type CIdentifier -> Q Type
cToHs Context
ctx Purity
purity Type CIdentifier
cType
    [(Type, Exp)]
hsParams <- forall (t :: * -> *) (m :: * -> *) a b.
(Traversable t, Monad m) =>
t a -> (a -> m b) -> m (t b)
forM [(CIdentifier, Type CIdentifier, ParameterType)]
cParams forall a b. (a -> b) -> a -> b
$ \(CIdentifier
_cId, Type CIdentifier
cTy, ParameterType
parTy) -> do
      case ParameterType
parTy of
        Plain HaskellIdentifier
s' -> do
          Type
hsTy <- Context -> Purity -> Type CIdentifier -> Q Type
cToHs Context
ctx Purity
purity Type CIdentifier
cTy
          let hsName :: Name
hsName = String -> Name
TH.mkName (HaskellIdentifier -> String
unHaskellIdentifier HaskellIdentifier
s')
          Exp
hsExp <- [| \cont -> cont ($(TH.varE hsName) :: $(return hsTy)) |]
          forall (m :: * -> *) a. Monad m => a -> m a
return (Type
hsTy, Exp
hsExp)
        AntiQuote String
antiId SomeEq
dyn -> do
          case forall k a. Ord k => k -> Map k a -> Maybe a
Map.lookup String
antiId (Context -> AntiQuoters
ctxAntiQuoters Context
ctx) of
            Maybe SomeAntiQuoter
Nothing ->
              forall (m :: * -> *) a. MonadFail m => String -> m a
fail forall a b. (a -> b) -> a -> b
$ String
"IMPOSSIBLE: could not find anti-quoter " forall a. [a] -> [a] -> [a]
++ forall a. Show a => a -> String
show String
antiId forall a. [a] -> [a] -> [a]
++
                     String
". (genericQuote)"
            Just (SomeAntiQuoter AntiQuoter a
antiQ) -> case forall a. (Eq a, Typeable a) => SomeEq -> Maybe a
fromSomeEq SomeEq
dyn of
              Maybe a
Nothing ->
                forall (m :: * -> *) a. MonadFail m => String -> m a
fail  forall a b. (a -> b) -> a -> b
$ String
"IMPOSSIBLE: could not cast value for anti-quoter " forall a. [a] -> [a] -> [a]
++
                        forall a. Show a => a -> String
show String
antiId forall a. [a] -> [a] -> [a]
++ String
". (genericQuote)"
              Just a
x ->
                forall a.
AntiQuoter a
-> Purity -> TypesTable -> Type CIdentifier -> a -> Q (Type, Exp)
aqMarshaller AntiQuoter a
antiQ Purity
purity (Context -> TypesTable
ctxTypesTable Context
ctx) Type CIdentifier
cTy a
x
    let hsFunType :: Q Type
hsFunType = Type -> [Type] -> Q Type
convertCFunSig Type
hsType forall a b. (a -> b) -> a -> b
$ forall a b. (a -> b) -> [a] -> [b]
map forall a b. (a, b) -> a
fst [(Type, Exp)]
hsParams
    let cParams' :: [(CIdentifier, Type CIdentifier)]
cParams' = [(CIdentifier
cId, Type CIdentifier
cTy) | (CIdentifier
cId, Type CIdentifier
cTy, ParameterType
_) <- [(CIdentifier, Type CIdentifier, ParameterType)]
cParams]
    Exp
ioCall <- Context -> Q Exp -> [Exp] -> [Name] -> Q Exp
buildFunCall Context
ctx (Loc
-> Q Type
-> Type CIdentifier
-> [(CIdentifier, Type CIdentifier)]
-> String
-> Q Exp
build Loc
here Q Type
hsFunType Type CIdentifier
cType [(CIdentifier, Type CIdentifier)]
cParams' String
cExp) (forall a b. (a -> b) -> [a] -> [b]
map forall a b. (a, b) -> b
snd [(Type, Exp)]
hsParams) []
    -- If the user requested a pure function, make it so.
    case Purity
purity of
      -- Using unsafeDupablePerformIO to increase performance of pure calls, see <https://github.com/fpco/inline-c/issues/115>
      Purity
Pure -> [| unsafeDupablePerformIO $(return ioCall) |]
      Purity
IO -> forall (m :: * -> *) a. Monad m => a -> m a
return Exp
ioCall
  where
    buildFunCall :: Context -> TH.ExpQ -> [TH.Exp] -> [TH.Name] -> TH.ExpQ
    buildFunCall :: Context -> Q Exp -> [Exp] -> [Name] -> Q Exp
buildFunCall Context
_ctx Q Exp
f [] [Name]
args =
      forall (t :: * -> *) b a.
Foldable t =>
(b -> a -> b) -> b -> t a -> b
foldl (\Q Exp
f' Name
arg -> [| $f' $(TH.varE arg) |]) Q Exp
f [Name]
args
    buildFunCall Context
ctx Q Exp
f (Exp
hsExp : [Exp]
params) [Name]
args =
       [| $(return hsExp) $ \arg ->
            $(buildFunCall ctx f params (args ++ ['arg]))
       |]

    convertCFunSig :: TH.Type -> [TH.Type] -> TH.TypeQ
    convertCFunSig :: Type -> [Type] -> Q Type
convertCFunSig Type
retType [Type]
params0 = do
      [Type] -> Q Type
go [Type]
params0
      where
        go :: [Type] -> Q Type
go [] =
          [t| IO $(return retType) |]
        go (Type
paramType : [Type]
params) = do
          [t| $(return paramType) -> $(go params) |]


-- NOTE: splitTypedC wouldn't be necessary if inline-c-cpp could reuse C.block
-- internals with a clean interface.
-- This would be a significant refactoring but presumably it would lead to an
-- api that could let users write their own quasiquoters a bit more conveniently.

-- | Returns the type and the body separately.
splitTypedC :: String -> (String, String, Int)
splitTypedC :: String -> (String, String, Int)
splitTypedC String
s = (String -> String
trim String
ty, String
bodyIndent forall a. Semigroup a => a -> a -> a
<> String
body, Int
bodyLineShift)
  where (String
ty, String
body) = forall a. (a -> Bool) -> [a] -> ([a], [a])
span (forall a. Eq a => a -> a -> Bool
/= Char
'{') String
s
        trim :: String -> String
trim String
x = forall a. (a -> Bool) -> [a] -> [a]
L.dropWhileEnd Char -> Bool
C.isSpace (forall a. (a -> Bool) -> [a] -> [a]
dropWhile Char -> Bool
C.isSpace String
x)

        -- We may need to correct the line number of the body
        bodyLineShift :: Int
bodyLineShift = forall (t :: * -> *) a. Foldable t => t a -> Int
length (forall a. (a -> Bool) -> [a] -> [a]
filter (forall a. Eq a => a -> a -> Bool
== Char
'\n') String
ty)

        -- Indentation is relevant for error messages when the syntax is:
        -- [C.foo| type
        --   { foo(); }
        -- |]
        bodyIndent :: String
bodyIndent =
          let precedingSpaceReversed :: String
precedingSpaceReversed =
                forall a. (a -> Bool) -> [a] -> [a]
takeWhile (\Char
c -> Char -> Bool
C.isSpace Char
c) forall a b. (a -> b) -> a -> b
$
                forall a. [a] -> [a]
reverse forall a b. (a -> b) -> a -> b
$
                String
ty
              (String
precedingSpacesTabsReversed, String
precedingLine) =
                forall a. (a -> Bool) -> [a] -> ([a], [a])
span (forall (t :: * -> *) a. (Foldable t, Eq a) => a -> t a -> Bool
`notElem` (String
"\n\r" :: [Char])) String
precedingSpaceReversed
          in case String
precedingLine of
            (Char
'\n':String
_) -> forall a. [a] -> [a]
reverse String
precedingSpacesTabsReversed
            (Char
'\r':String
_) -> forall a. [a] -> [a]
reverse String
precedingSpacesTabsReversed
            String
_ -> String
"" -- it wasn't indentation after all; just spaces after the type

-- | Data to parse for the 'funPtr' quasi-quoter.
data FunPtrDecl = FunPtrDecl
  { FunPtrDecl -> Type CIdentifier
funPtrReturnType :: C.Type C.CIdentifier
  , FunPtrDecl -> [(CIdentifier, Type CIdentifier)]
funPtrParameters :: [(C.CIdentifier, C.Type C.CIdentifier)]
  , FunPtrDecl -> String
funPtrBody :: String
  , FunPtrDecl -> Maybe String
funPtrName :: Maybe String
  } deriving (FunPtrDecl -> FunPtrDecl -> Bool
forall a. (a -> a -> Bool) -> (a -> a -> Bool) -> Eq a
/= :: FunPtrDecl -> FunPtrDecl -> Bool
$c/= :: FunPtrDecl -> FunPtrDecl -> Bool
== :: FunPtrDecl -> FunPtrDecl -> Bool
$c== :: FunPtrDecl -> FunPtrDecl -> Bool
Eq, Int -> FunPtrDecl -> String -> String
[FunPtrDecl] -> String -> String
FunPtrDecl -> String
forall a.
(Int -> a -> String -> String)
-> (a -> String) -> ([a] -> String -> String) -> Show a
showList :: [FunPtrDecl] -> String -> String
$cshowList :: [FunPtrDecl] -> String -> String
show :: FunPtrDecl -> String
$cshow :: FunPtrDecl -> String
showsPrec :: Int -> FunPtrDecl -> String -> String
$cshowsPrec :: Int -> FunPtrDecl -> String -> String
Show)

funPtrQuote :: TH.Safety -> TH.QuasiQuoter
funPtrQuote :: Safety -> QuasiQuoter
funPtrQuote Safety
callSafety = (String -> Q Exp) -> QuasiQuoter
quoteCode forall a b. (a -> b) -> a -> b
$ \String
rawCode -> do
  Loc
loc <- Q Loc
TH.location
  Context
ctx <- Q Context
getContext
  String
code <- String -> Q String
applySubstitutions String
rawCode
  FunPtrDecl{String
[(CIdentifier, Type CIdentifier)]
Maybe String
Type CIdentifier
funPtrName :: Maybe String
funPtrBody :: String
funPtrParameters :: [(CIdentifier, Type CIdentifier)]
funPtrReturnType :: Type CIdentifier
funPtrName :: FunPtrDecl -> Maybe String
funPtrBody :: FunPtrDecl -> String
funPtrParameters :: FunPtrDecl -> [(CIdentifier, Type CIdentifier)]
funPtrReturnType :: FunPtrDecl -> Type CIdentifier
..} <- forall ident a.
Hashable ident =>
String
-> CParserContext ident
-> (forall (m :: * -> *). CParser ident m => m a)
-> Q a
runParserInQ String
code (Bool -> TypeNames -> CParserContext CIdentifier
C.cCParserContext (Context -> Bool
ctxEnableCpp Context
ctx) (TypesTable -> TypeNames
typeNamesFromTypesTable (Context -> TypesTable
ctxTypesTable Context
ctx))) forall (m :: * -> *). CParser CIdentifier m => m FunPtrDecl
parse
  Type
hsRetType <- Context -> Purity -> Type CIdentifier -> Q Type
cToHs Context
ctx Purity
IO Type CIdentifier
funPtrReturnType
  [Type]
hsParams <- forall (t :: * -> *) (m :: * -> *) a b.
(Traversable t, Monad m) =>
t a -> (a -> m b) -> m (t b)
forM [(CIdentifier, Type CIdentifier)]
funPtrParameters (\(CIdentifier
_ident, Type CIdentifier
typ_) -> Context -> Purity -> Type CIdentifier -> Q Type
cToHs Context
ctx Purity
IO Type CIdentifier
typ_)
  let hsFunType :: Q Type
hsFunType = Type -> [Type] -> Q Type
convertCFunSig Type
hsRetType [Type]
hsParams
  Safety
-> Bool
-> Maybe String
-> Loc
-> Q Type
-> Type CIdentifier
-> [(CIdentifier, Type CIdentifier)]
-> String
-> Q Exp
inlineItems Safety
callSafety Bool
True Maybe String
funPtrName Loc
loc Q Type
hsFunType Type CIdentifier
funPtrReturnType [(CIdentifier, Type CIdentifier)]
funPtrParameters String
funPtrBody
  where
    convertCFunSig :: TH.Type -> [TH.Type] -> TH.TypeQ
    convertCFunSig :: Type -> [Type] -> Q Type
convertCFunSig Type
retType [Type]
params0 = do
      [Type] -> Q Type
go [Type]
params0
      where
        go :: [Type] -> Q Type
go [] =
          [t| IO $(return retType) |]
        go (Type
paramType : [Type]
params) = do
          [t| $(return paramType) -> $(go params) |]

    parse :: C.CParser C.CIdentifier m => m FunPtrDecl
    parse :: forall (m :: * -> *). CParser CIdentifier m => m FunPtrDecl
parse = do
      -- skip spaces
      forall (m :: * -> *). CharParsing m => m ()
Parser.spaces
      -- parse a proto
      C.ParameterDeclaration Maybe CIdentifier
mbName Type CIdentifier
protoTyp <- forall i (m :: * -> *).
(CParser i m, Pretty i) =>
m (ParameterDeclaration i)
C.parseParameterDeclaration
      case Type CIdentifier
protoTyp of
        C.Proto Type CIdentifier
retType [ParameterDeclaration CIdentifier]
paramList -> do
          [(CIdentifier, Type CIdentifier)]
args <- forall (t :: * -> *) (m :: * -> *) a b.
(Traversable t, Monad m) =>
t a -> (a -> m b) -> m (t b)
forM [ParameterDeclaration CIdentifier]
paramList forall a b. (a -> b) -> a -> b
$ \ParameterDeclaration CIdentifier
decl -> case forall i. ParameterDeclaration i -> Maybe i
C.parameterDeclarationId ParameterDeclaration CIdentifier
decl of
            Maybe CIdentifier
Nothing -> forall (m :: * -> *) a. MonadFail m => String -> m a
fail forall a b. (a -> b) -> a -> b
$ forall ann. Doc ann -> String
pretty80 forall a b. (a -> b) -> a -> b
$
              Doc Any
"Un-named captured variable in decl" forall ann. Doc ann -> Doc ann -> Doc ann
<+> forall a ann. Pretty a => a -> Doc ann
PP.pretty ParameterDeclaration CIdentifier
decl
            Just CIdentifier
declId -> forall (m :: * -> *) a. Monad m => a -> m a
return (CIdentifier
declId, forall i. ParameterDeclaration i -> Type i
C.parameterDeclarationType ParameterDeclaration CIdentifier
decl)
          -- get the rest of the body
          forall (f :: * -> *) a. Functor f => f a -> f ()
void (forall (m :: * -> *). TokenParsing m => Char -> m Char
Parser.symbolic Char
'{')
          String
body <- forall (m :: * -> *). CParser CIdentifier m => m String
parseBody
          forall (m :: * -> *) a. Monad m => a -> m a
return FunPtrDecl
            { funPtrReturnType :: Type CIdentifier
funPtrReturnType = Type CIdentifier
retType
            , funPtrParameters :: [(CIdentifier, Type CIdentifier)]
funPtrParameters = [(CIdentifier, Type CIdentifier)]
args
            , funPtrBody :: String
funPtrBody = String
body
            , funPtrName :: Maybe String
funPtrName = forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap CIdentifier -> String
C.unCIdentifier Maybe CIdentifier
mbName
            }
        Type CIdentifier
_ -> forall (m :: * -> *) a. MonadFail m => String -> m a
fail forall a b. (a -> b) -> a -> b
$ String
"Expecting function declaration"

    parseBody :: C.CParser C.CIdentifier m => m String
    parseBody :: forall (m :: * -> *). CParser CIdentifier m => m String
parseBody = do
      String
s <- forall (m :: * -> *) a end. Alternative m => m a -> m end -> m [a]
Parser.manyTill forall (m :: * -> *). CharParsing m => m Char
Parser.anyChar forall a b. (a -> b) -> a -> b
$
           forall (m :: * -> *) a. LookAheadParsing m => m a -> m a
Parser.lookAhead (forall (m :: * -> *). CharParsing m => Char -> m Char
Parser.char Char
'}')
      String
s' <- forall (t :: * -> *) (m :: * -> *) a.
(Foldable t, MonadPlus m) =>
t (m a) -> m a
msum
        [ do forall (m :: * -> *) a. Parsing m => m a -> m a
Parser.try forall a b. (a -> b) -> a -> b
$ do -- Try because we might fail to parse the 'eof'
                -- 'symbolic' because we want to consume whitespace
               forall (f :: * -> *) a. Functor f => f a -> f ()
void forall a b. (a -> b) -> a -> b
$ forall (m :: * -> *). TokenParsing m => Char -> m Char
Parser.symbolic Char
'}'
               forall (m :: * -> *). Parsing m => m ()
Parser.eof
             forall (m :: * -> *) a. Monad m => a -> m a
return String
""
        , do forall (f :: * -> *) a. Functor f => f a -> f ()
void forall a b. (a -> b) -> a -> b
$ forall (m :: * -> *). CharParsing m => Char -> m Char
Parser.char Char
'}'
             String
s' <- forall (m :: * -> *). CParser CIdentifier m => m String
parseBody
             forall (m :: * -> *) a. Monad m => a -> m a
return (String
"}" forall a. [a] -> [a] -> [a]
++ String
s')
        ]
      forall (m :: * -> *) a. Monad m => a -> m a
return (String
s forall a. [a] -> [a] -> [a]
++ String
s')

------------------------------------------------------------------------
-- Line directives

-- | Tell the C compiler where the next line came from.
--
-- Example:
--
-- @@@
-- there <- location
-- f (unlines
--   [ lineDirective $(here)
--   , "generated_code_user_did_not_write()"
--   , lineDirective there
--   ] ++ userCode
-- ])
-- @@@
--
-- Use @lineDirective $(C.here)@ when generating code, so that any errors or
-- warnings report the location of the generating haskell module, rather than
-- tangentially related user code that doesn't contain the actual problem.
lineDirective :: TH.Loc -> String
lineDirective :: Loc -> String
lineDirective Loc
l = String
"#line " forall a. [a] -> [a] -> [a]
++ forall a. Show a => a -> String
show (forall a b. (a, b) -> a
fst forall a b. (a -> b) -> a -> b
$ Loc -> (Int, Int)
TH.loc_start Loc
l) forall a. [a] -> [a] -> [a]
++ String
" " forall a. [a] -> [a] -> [a]
++ forall a. Show a => a -> String
show (Loc -> String
TH.loc_filename Loc
l ) forall a. [a] -> [a] -> [a]
++ String
"\n"

-- | Get the location of the code you're looking at, for use with
-- 'lineDirective'; place before generated code that user did not write.
here :: TH.ExpQ
here :: Q Exp
here = [| $(TH.location >>= \(TH.Loc a b c (d1, d2) (e1, e2)) ->
    [|Loc
      $(TH.lift a)
      $(TH.lift b)
      $(TH.lift c)
      ($(TH.lift d1), $(TH.lift d2))
      ($(TH.lift e1), $(TH.lift e2))
    |])
  |]

shiftLines :: Int -> TH.Loc -> TH.Loc
shiftLines :: Int -> Loc -> Loc
shiftLines Int
n Loc
l = Loc
l
  { loc_start :: (Int, Int)
TH.loc_start =
      let (Int
startLn, Int
startCol) = Loc -> (Int, Int)
TH.loc_start Loc
l
      in (Int
startLn forall a. Num a => a -> a -> a
+ Int
n, Int
startCol)
  , loc_end :: (Int, Int)
TH.loc_end =
      let (Int
endLn, Int
endCol) = Loc -> (Int, Int)
TH.loc_end Loc
l
      in (Int
endLn forall a. Num a => a -> a -> a
+ Int
n, Int
endCol)
  }

------------------------------------------------------------------------
-- Utils

pretty80 :: PP.Doc ann -> String
pretty80 :: forall ann. Doc ann -> String
pretty80 Doc ann
x = forall ann. SimpleDocStream ann -> String
PP.renderString forall a b. (a -> b) -> a -> b
$ forall ann. LayoutOptions -> Doc ann -> SimpleDocStream ann
PP.layoutSmart (PP.LayoutOptions { layoutPageWidth :: PageWidth
PP.layoutPageWidth = Int -> Double -> PageWidth
PP.AvailablePerLine Int
80 Double
0.8 }) Doc ann
x

prettyOneLine :: PP.Doc ann -> String
prettyOneLine :: forall ann. Doc ann -> String
prettyOneLine Doc ann
x = forall ann. SimpleDocStream ann -> String
PP.renderString forall a b. (a -> b) -> a -> b
$ forall ann1 ann2. Doc ann1 -> SimpleDocStream ann2
PP.layoutCompact Doc ann
x