module Language.PureScript.CodeGen.JS
( module AST
, module Common
, moduleToJs
, mainCall
) where
import Data.List ((\\), delete, intersect)
import qualified Data.Traversable as T (traverse)
import Control.Applicative
import Control.Arrow ((&&&))
import Control.Monad (replicateM, forM)
import Control.Monad.Reader (MonadReader, asks)
import Control.Monad.Supply.Class
import Language.PureScript.AST.SourcePos
import Language.PureScript.CodeGen.JS.AST as AST
import Language.PureScript.CodeGen.JS.Common as Common
import Language.PureScript.CoreFn
import Language.PureScript.Names
import Language.PureScript.CodeGen.JS.Optimizer
import Language.PureScript.Options
import Language.PureScript.Traversals (sndM)
import qualified Language.PureScript.Constants as C
import System.FilePath.Posix ((</>))
moduleToJs :: forall m. (Applicative m, Monad m, MonadReader Options m, MonadSupply m)
=> Module Ann -> Maybe JS -> m [JS]
moduleToJs (Module coms mn imps exps foreigns decls) foreign = do
jsImports <- T.traverse importToJs . delete (ModuleName [ProperName C.prim]) . (\\ [mn]) $ imps
jsDecls <- mapM bindToJs decls
optimized <- T.traverse (T.traverse optimize) jsDecls
comments <- not <$> asks optionsNoComments
let strict = JSStringLiteral "use strict"
let header = if comments && not (null coms) then JSComment coms strict else strict
let foreign' = [JSVariableIntroduction "$foreign" foreign | not $ null foreigns || foreign == Nothing]
let moduleBody = header : foreign' ++ jsImports ++ concat optimized
let foreignExps = exps `intersect` (fst `map` foreigns)
let standardExps = exps \\ foreignExps
let exps' = JSObjectLiteral $ map (runIdent &&& JSVar . identToJs) standardExps
++ map (runIdent &&& foreignIdent) foreignExps
return $ moduleBody ++ [JSAssignment (JSAccessor "exports" (JSVar "module")) exps']
where
importToJs :: ModuleName -> m JS
importToJs mn' = do
path <- asks optionsRequirePath
let moduleBody = JSApp (JSVar "require") [JSStringLiteral (maybe id (</>) path $ runModuleName mn')]
return $ JSVariableIntroduction (moduleNameToJs mn') (Just moduleBody)
bindToJs :: Bind Ann -> m [JS]
bindToJs (NonRec ident val) = return <$> nonRecToJS ident val
bindToJs (Rec vals) = forM vals (uncurry nonRecToJS)
nonRecToJS :: Ident -> Expr Ann -> m JS
nonRecToJS i e@(extractAnn -> (_, com, _, _)) | not (null com) = do
withoutComment <- asks optionsNoComments
if withoutComment
then nonRecToJS i (modifyAnn removeComments e)
else JSComment com <$> nonRecToJS i (modifyAnn removeComments e)
nonRecToJS ident val = do
js <- valueToJs val
return $ JSVariableIntroduction (identToJs ident) (Just js)
var :: Ident -> JS
var = JSVar . identToJs
accessor :: Ident -> JS -> JS
accessor (Ident prop) = accessorString prop
accessor (Op op) = JSIndexer (JSStringLiteral op)
accessorString :: String -> JS -> JS
accessorString prop | identNeedsEscaping prop = JSIndexer (JSStringLiteral prop)
| otherwise = JSAccessor prop
valueToJs :: Expr Ann -> m JS
valueToJs (Literal _ l) =
literalToValueJS l
valueToJs (Var (_, _, _, Just (IsConstructor _ [])) name) =
return $ JSAccessor "value" $ qualifiedToJS id name
valueToJs (Var (_, _, _, Just (IsConstructor _ _)) name) =
return $ JSAccessor "create" $ qualifiedToJS id name
valueToJs (Accessor _ prop val) =
accessorString prop <$> valueToJs val
valueToJs (ObjectUpdate _ o ps) = do
obj <- valueToJs o
sts <- mapM (sndM valueToJs) ps
extendObj obj sts
valueToJs e@(Abs (_, _, _, Just IsTypeClassConstructor) _ _) =
let args = unAbs e
in return $ JSFunction Nothing (map identToJs args) (JSBlock $ map assign args)
where
unAbs :: Expr Ann -> [Ident]
unAbs (Abs _ arg val) = arg : unAbs val
unAbs _ = []
assign :: Ident -> JS
assign name = JSAssignment (accessorString (runIdent name) (JSVar "this"))
(var name)
valueToJs (Abs _ arg val) = do
ret <- valueToJs val
return $ JSFunction Nothing [identToJs arg] (JSBlock [JSReturn ret])
valueToJs e@App{} = do
let (f, args) = unApp e []
args' <- mapM valueToJs args
case f of
Var (_, _, _, Just IsNewtype) _ -> return (head args')
Var (_, _, _, Just (IsConstructor _ fields)) name | length args == length fields ->
return $ JSUnary JSNew $ JSApp (qualifiedToJS id name) args'
Var (_, _, _, Just IsTypeClassConstructor) name ->
return $ JSUnary JSNew $ JSApp (qualifiedToJS id name) args'
_ -> flip (foldl (\fn a -> JSApp fn [a])) args' <$> valueToJs f
where
unApp :: Expr Ann -> [Expr Ann] -> (Expr Ann, [Expr Ann])
unApp (App _ val arg) args = unApp val (arg : args)
unApp other args = (other, args)
valueToJs (Var (_, _, _, Just IsForeign) qi@(Qualified (Just mn') ident)) =
return $ if mn' == mn
then foreignIdent ident
else varToJs qi
valueToJs (Var (_, _, _, Just IsForeign) ident) =
error $ "Encountered an unqualified reference to a foreign ident " ++ show ident
valueToJs (Var _ ident) =
return $ varToJs ident
valueToJs (Case (maybeSpan, _, _, _) values binders) = do
vals <- mapM valueToJs values
bindersToJs maybeSpan binders vals
valueToJs (Let _ ds val) = do
ds' <- concat <$> mapM bindToJs ds
ret <- valueToJs val
return $ JSApp (JSFunction Nothing [] (JSBlock (ds' ++ [JSReturn ret]))) []
valueToJs (Constructor (_, _, _, Just IsNewtype) _ (ProperName ctor) _) =
return $ JSVariableIntroduction ctor (Just $
JSObjectLiteral [("create",
JSFunction Nothing ["value"]
(JSBlock [JSReturn $ JSVar "value"]))])
valueToJs (Constructor _ _ (ProperName ctor) []) =
return $ iife ctor [ JSFunction (Just ctor) [] (JSBlock [])
, JSAssignment (JSAccessor "value" (JSVar ctor))
(JSUnary JSNew $ JSApp (JSVar ctor) []) ]
valueToJs (Constructor _ _ (ProperName ctor) fields) =
let constructor =
let body = [ JSAssignment (JSAccessor (identToJs f) (JSVar "this")) (var f) | f <- fields ]
in JSFunction (Just ctor) (identToJs `map` fields) (JSBlock body)
createFn =
let body = JSUnary JSNew $ JSApp (JSVar ctor) (var `map` fields)
in foldr (\f inner -> JSFunction Nothing [identToJs f] (JSBlock [JSReturn inner])) body fields
in return $ iife ctor [ constructor
, JSAssignment (JSAccessor "create" (JSVar ctor)) createFn
]
iife :: String -> [JS] -> JS
iife v exprs = JSApp (JSFunction Nothing [] (JSBlock $ exprs ++ [JSReturn $ JSVar v])) []
literalToValueJS :: Literal (Expr Ann) -> m JS
literalToValueJS (NumericLiteral n) = return $ JSNumericLiteral n
literalToValueJS (StringLiteral s) = return $ JSStringLiteral s
literalToValueJS (CharLiteral c) = return $ JSStringLiteral [c]
literalToValueJS (BooleanLiteral b) = return $ JSBooleanLiteral b
literalToValueJS (ArrayLiteral xs) = JSArrayLiteral <$> mapM valueToJs xs
literalToValueJS (ObjectLiteral ps) = JSObjectLiteral <$> mapM (sndM valueToJs) ps
extendObj :: JS -> [(String, JS)] -> m JS
extendObj obj sts = do
newObj <- freshName
key <- freshName
let
jsKey = JSVar key
jsNewObj = JSVar newObj
block = JSBlock (objAssign:copy:extend ++ [JSReturn jsNewObj])
objAssign = JSVariableIntroduction newObj (Just $ JSObjectLiteral [])
copy = JSForIn key obj $ JSBlock [JSIfElse cond assign Nothing]
cond = JSApp (JSAccessor "hasOwnProperty" obj) [jsKey]
assign = JSBlock [JSAssignment (JSIndexer jsKey jsNewObj) (JSIndexer jsKey obj)]
stToAssign (s, js) = JSAssignment (JSAccessor s jsNewObj) js
extend = map stToAssign sts
return $ JSApp (JSFunction Nothing [] block) []
varToJs :: Qualified Ident -> JS
varToJs (Qualified Nothing ident) = var ident
varToJs qual = qualifiedToJS id qual
qualifiedToJS :: (a -> Ident) -> Qualified a -> JS
qualifiedToJS f (Qualified (Just (ModuleName [ProperName mn'])) a) | mn' == C.prim = JSVar . runIdent $ f a
qualifiedToJS f (Qualified (Just mn') a) | mn /= mn' = accessor (f a) (JSVar (moduleNameToJs mn'))
qualifiedToJS f (Qualified _ a) = JSVar $ identToJs (f a)
foreignIdent :: Ident -> JS
foreignIdent ident = accessorString (runIdent ident) (JSVar "$foreign")
bindersToJs :: Maybe SourceSpan -> [CaseAlternative Ann] -> [JS] -> m JS
bindersToJs maybeSpan binders vals = do
valNames <- replicateM (length vals) freshName
let assignments = zipWith JSVariableIntroduction valNames (map Just vals)
jss <- forM binders $ \(CaseAlternative bs result) -> do
ret <- guardsToJs result
go valNames ret bs
return $ JSApp (JSFunction Nothing [] (JSBlock (assignments ++ concat jss ++ [JSThrow $ failedPatternError valNames])))
[]
where
go :: [String] -> [JS] -> [Binder Ann] -> m [JS]
go _ done [] = return done
go (v:vs) done' (b:bs) = do
done'' <- go vs done' bs
binderToJs v done'' b
go _ _ _ = error "Invalid arguments to bindersToJs"
failedPatternError :: [String] -> JS
failedPatternError names = JSUnary JSNew $ JSApp (JSVar "Error") [JSBinary Add (JSStringLiteral errorMessage) (JSArrayLiteral $ zipWith valueError names vals)]
errorMessage :: String
errorMessage = "Failed pattern match" ++ maybe "" (((" at " ++ runModuleName mn ++ " ") ++) . displayStartEndPos) maybeSpan ++ ": "
valueError :: String -> JS -> JS
valueError _ l@(JSNumericLiteral _) = l
valueError _ l@(JSStringLiteral _) = l
valueError _ l@(JSBooleanLiteral _) = l
valueError s _ = JSAccessor "name" . JSAccessor "constructor" $ JSVar s
guardsToJs :: Either [(Guard Ann, Expr Ann)] (Expr Ann) -> m [JS]
guardsToJs (Left gs) = forM gs $ \(cond, val) -> do
cond' <- valueToJs cond
done <- valueToJs val
return $ JSIfElse cond' (JSBlock [JSReturn done]) Nothing
guardsToJs (Right v) = return . JSReturn <$> valueToJs v
binderToJs :: String -> [JS] -> Binder Ann -> m [JS]
binderToJs _ done (NullBinder{}) = return done
binderToJs varName done (LiteralBinder _ l) =
literalToBinderJS varName done l
binderToJs varName done (VarBinder _ ident) =
return (JSVariableIntroduction (identToJs ident) (Just (JSVar varName)) : done)
binderToJs varName done (ConstructorBinder (_, _, _, Just IsNewtype) _ _ [b]) =
binderToJs varName done b
binderToJs varName done (ConstructorBinder (_, _, _, Just (IsConstructor ctorType fields)) _ ctor bs) = do
js <- go (zip fields bs) done
return $ case ctorType of
ProductType -> js
SumType ->
[JSIfElse (JSInstanceOf (JSVar varName) (qualifiedToJS (Ident . runProperName) ctor))
(JSBlock js)
Nothing]
where
go :: [(Ident, Binder Ann)] -> [JS] -> m [JS]
go [] done' = return done'
go ((field, binder) : remain) done' = do
argVar <- freshName
done'' <- go remain done'
js <- binderToJs argVar done'' binder
return (JSVariableIntroduction argVar (Just (JSAccessor (identToJs field) (JSVar varName))) : js)
binderToJs _ _ b@(ConstructorBinder{}) =
error $ "Invalid ConstructorBinder in binderToJs: " ++ show b
binderToJs varName done (NamedBinder _ ident binder) = do
js <- binderToJs varName done binder
return (JSVariableIntroduction (identToJs ident) (Just (JSVar varName)) : js)
literalToBinderJS :: String -> [JS] -> Literal (Binder Ann) -> m [JS]
literalToBinderJS varName done (NumericLiteral num) =
return [JSIfElse (JSBinary EqualTo (JSVar varName) (JSNumericLiteral num)) (JSBlock done) Nothing]
literalToBinderJS varName done (CharLiteral c) =
return [JSIfElse (JSBinary EqualTo (JSVar varName) (JSStringLiteral [c])) (JSBlock done) Nothing]
literalToBinderJS varName done (StringLiteral str) =
return [JSIfElse (JSBinary EqualTo (JSVar varName) (JSStringLiteral str)) (JSBlock done) Nothing]
literalToBinderJS varName done (BooleanLiteral True) =
return [JSIfElse (JSVar varName) (JSBlock done) Nothing]
literalToBinderJS varName done (BooleanLiteral False) =
return [JSIfElse (JSUnary Not (JSVar varName)) (JSBlock done) Nothing]
literalToBinderJS varName done (ObjectLiteral bs) = go done bs
where
go :: [JS] -> [(String, Binder Ann)] -> m [JS]
go done' [] = return done'
go done' ((prop, binder):bs') = do
propVar <- freshName
done'' <- go done' bs'
js <- binderToJs propVar done'' binder
return (JSVariableIntroduction propVar (Just (accessorString prop (JSVar varName))) : js)
literalToBinderJS varName done (ArrayLiteral bs) = do
js <- go done 0 bs
return [JSIfElse (JSBinary EqualTo (JSAccessor "length" (JSVar varName)) (JSNumericLiteral (Left (fromIntegral $ length bs)))) (JSBlock js) Nothing]
where
go :: [JS] -> Integer -> [Binder Ann] -> m [JS]
go done' _ [] = return done'
go done' index (binder:bs') = do
elVar <- freshName
done'' <- go done' (index + 1) bs'
js <- binderToJs elVar done'' binder
return (JSVariableIntroduction elVar (Just (JSIndexer (JSNumericLiteral (Left index)) (JSVar varName))) : js)
mainCall :: ModuleName -> String -> JS
mainCall mmi ns = JSApp (JSAccessor C.main (JSAccessor (moduleNameToJs mmi) (JSVar ns))) []