git.iko.soy/elk
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elk/compiler/Generate/JavaScript.hs
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1module Generate.JavaScript where
3import Control.Arrow (first,(***))
4import Control.Applicative ((<$>),(<*>))
5import Control.Monad.State
6import qualified Data.List as List
7import qualified Data.Map as Map
8import qualified Data.Set as Set
9import qualified Text.Pandoc as Pan
11import Generate.Cases
12import SourceSyntax.Everything
13import SourceSyntax.Location
14import qualified Transform.SortDefinitions as SD
15import Language.ECMAScript3.Syntax
16import Language.ECMAScript3.PrettyPrint
17import Parse.Helpers (jsReserveds)
19makeSafe :: String -> String
20makeSafe = List.intercalate "." . map dereserve . split . deprime
21 where
22 deprime = map (\c -> if c == '\'' then '$' else c)
23 dereserve x = case Set.member x jsReserveds of
24 False -> x
25 True -> "$" ++ x
27split = go []
28 where
29 go vars str =
30 case break (=='.') str of
31 (x,'.':rest) | isOp x -> vars ++ [x ++ '.' : rest]
32 | otherwise -> go (vars ++ [x]) rest
33 (x,[]) -> vars ++ [x]
35var name = Id () (makeSafe name)
36ref name = VarRef () (var name)
37prop name = PropId () (var name)
38f <| x = CallExpr () f [x]
39args ==> e = FuncExpr () Nothing (map var args) [ ReturnStmt () (Just e) ]
40function args stmts = FuncExpr () Nothing (map var args) stmts
41call = CallExpr ()
42string = StringLit ()
44dotSep (x:xs) = foldl (DotRef ()) (ref x) (map var xs)
45obj = dotSep . split
47varDecl x expr =
48 VarDecl () (var x) (Just expr)
50include alias moduleName =
51 varDecl alias (obj (moduleName ++ ".make") <| ref "elm")
53internalImports name =
54 VarDeclStmt ()
55 [ varDecl "N" (obj "Elm.Native")
56 , include "_N" "N.Utils"
57 , include "_L" "N.List"
58 , include "_E" "N.Error"
59 , include "_J" "N.JavaScript"
60 , varDecl "$moduleName" (string name)
61 ]
63literal lit =
64 case lit of
65 Chr c -> string [c]
66 Str s -> string s
67 IntNum n -> IntLit () n
68 FloatNum n -> NumLit () n
69 Boolean b -> BoolLit () b
71expression :: LExpr () () -> State Int (Expression ())
72expression (L span expr) =
73 case expr of
74 Var x -> return $ ref x
75 Literal lit -> return $ literal lit
77 Range lo hi ->
78 do lo' <- expression lo
79 hi' <- expression hi
80 return $ obj "_L.range" `call` [lo',hi']
82 Access e x ->
83 do e' <- expression e
84 return $ DotRef () e' (var x)
86 Remove e x ->
87 do e' <- expression e
88 return $ obj "_N.remove" `call` [string x, e']
90 Insert e x v ->
91 do v' <- expression v
92 e' <- expression e
93 return $ obj "_N.insert" `call` [string x, v', e']
95 Modify e fs ->
96 do e' <- expression e
97 fs' <- forM fs $ \(f,v) -> do
98 v' <- expression v
99 return $ ArrayLit () [string f, v']
100 return $ obj "_N.replace" `call` [ArrayLit () fs', e']
102 Record fields ->
103 do fields' <- forM fields $ \(f,e) -> do
104 (,) f <$> expression e
105 let fieldMap = List.foldl' combine Map.empty fields'
106 return $ ObjectLit () $ (PropId () (var "_"), hidden fieldMap) : visible fieldMap
107 where
108 combine r (k,v) = Map.insertWith (++) k [v] r
109 prop = PropId () . var
110 hidden fs = ObjectLit () . map (prop *** ArrayLit ()) .
111 Map.toList . Map.filter (not . null) $ Map.map tail fs
112 visible fs = map (first prop) . Map.toList $ Map.map head fs
114 Binop op e1 e2 -> binop span op e1 e2
116 Lambda p e@(L s _) ->
117 do body' <- expression body
118 return $ case length args < 2 || length args > 9 of
119 True -> foldr (==>) body' (map (:[]) args)
120 False -> ref ("F" ++ show (length args)) <| (args ==> body')
121 where
122 (args, body) = foldr depattern ([], innerBody) (zip patterns [0..])
124 depattern (pattern,n) (args, body) =
125 case pattern of
126 PVar x -> (args ++ [x], body)
127 _ -> let arg = "arg" ++ show n
128 in (args ++ [arg], L s (Case (L s (Var arg)) [(pattern, body)]))
130 (patterns, innerBody) = collect [p] e
132 collect patterns lexpr@(L _ expr) =
133 case expr of
134 Lambda p e -> collect (p:patterns) e
135 _ -> (patterns, lexpr)
137 App e1 e2 ->
138 do func' <- expression func
139 args' <- mapM expression args
140 return $ case args' of
141 [arg] -> func' <| arg
142 _ | length args' <= 9 -> ref aN `call` (func':args')
143 | otherwise -> foldl1 (<|) (func':args')
144 where
145 aN = "A" ++ show (length args)
146 (func, args) = getArgs e1 [e2]
147 getArgs func args =
148 case func of
149 (L _ (App f arg)) -> getArgs f (arg : args)
150 _ -> (func, args)
152 Let defs e ->
153 do let (defs',e') = SD.flattenLets defs e
154 stmts <- concat <$> mapM definition defs'
155 exp <- expression e'
156 return $ function [] (stmts ++ [ ReturnStmt () (Just exp) ]) `call` []
158 MultiIf branches ->
159 do branches' <- forM branches $ \(b,e) -> (,) <$> expression b <*> expression e
160 return $ case last branches of
161 (L _ (Var "Basics.otherwise"), e) -> ifs (init branches') (snd (last branches'))
162 _ -> ifs branches'
163 (obj "_E.If" `call` [ ref "$moduleName", string (show span) ])
164 where
165 ifs branches finally = foldr iff finally branches
166 iff (if', then') else' = CondExpr () if' then' else'
168 Case e cases ->
169 do (tempVar,initialMatch) <- caseToMatch cases
170 (revisedMatch, stmt) <-
171 case e of
172 L _ (Var x) -> return (matchSubst [(tempVar,x)] initialMatch, [])
173 _ -> do e' <- expression e
174 return (initialMatch, [VarDeclStmt () [varDecl tempVar e']])
175 match' <- match span revisedMatch
176 return (function [] (stmt ++ match') `call` [])
178 ExplicitList es ->
179 do es' <- mapM expression es
180 return $ obj "_J.toList" <| ArrayLit () es'
182 Data name es ->
183 do es' <- mapM expression es
184 return $ ObjectLit () (ctor : fields es')
185 where
186 ctor = (prop "ctor", string (makeSafe name))
187 fields = zipWith (\n e -> (prop ("_" ++ show n), e)) [0..]
189 Markdown doc _ -> return $ obj "Text.text" <| string (pad ++ md ++ pad)
190 where pad = "<div style=\"height:0;width:0;\">&nbsp;</div>"
191 md = Pan.writeHtmlString Pan.def doc
193definition :: Def () () -> State Int [Statement ()]
194definition def =
195 case def of
196 TypeAnnotation _ _ -> return []
198 Def pattern expr@(L span _) -> do
199 expr' <- expression expr
200 let assign x = varDecl x expr'
201 case pattern of
202 PVar x
203 | isOp x ->
204 let op = LBracket () (ref "_op") (string x) in
205 return [ ExprStmt () $ AssignExpr () OpAssign op expr' ]
206 | otherwise ->
207 return [ VarDeclStmt () [ assign x ] ]
209 PRecord fields ->
210 let setField f = varDecl f (dotSep ["$",f]) in
211 return [ VarDeclStmt () (assign "$" : map setField fields) ]
213 PData name patterns | vars /= Nothing ->
214 case vars of
215 Just vs -> return [ VarDeclStmt () (setup (zipWith decl vs [0..])) ]
216 where
217 vars = getVars patterns
218 getVars patterns =
219 case patterns of
220 PVar x : rest -> (x:) `fmap` getVars rest
221 [] -> Just []
222 _ -> Nothing
224 decl x n = varDecl x (dotSep ["$","_" ++ show n])
225 setup vars
226 | isTuple name = assign "$" : vars
227 | otherwise = safeAssign : vars
229 safeAssign = varDecl "$" (CondExpr () if' expr' exception)
230 if' = InfixExpr () OpStrictEq (obj "$.ctor") (string name)
231 exception = obj "_E.Case" `call` [ref "$moduleName", string (show span)]
233 _ ->
234 do defs' <- concat <$> mapM toDef vars
235 return (VarDeclStmt () [assign "$"] : defs')
236 where
237 vars = Set.toList $ SD.boundVars pattern
238 mkVar = L span . Var
239 toDef y = definition $
240 Def (PVar y) (L span $ Case (mkVar "$") [(pattern, mkVar y)])
242match span mtch =
243 case mtch of
244 Match name clauses mtch' ->
245 do clauses' <- mapM (clause span name) clauses
246 mtch'' <- match span mtch'
247 return (SwitchStmt () (access name) clauses' : mtch'')
248 where
249 isLiteral p = case p of
250 Clause (Right _) _ _ -> True
251 _ -> False
252 access name = if any isLiteral clauses then ref name else dotSep [name,"ctor"]
254 Fail -> return [ ExprStmt () (obj "_E.Case" `call` [ref "$moduleName", string (show span)]) ]
255 Break -> return []
256 Other e ->
257 do e' <- expression e
258 return [ ReturnStmt () (Just e') ]
259 Seq ms -> concat <$> mapM (match span) (dropEnd [] ms)
260 where
261 dropEnd acc [] = acc
262 dropEnd acc (m:ms) =
263 case m of
264 Other _ -> acc ++ [m]
265 _ -> dropEnd (acc ++ [m]) ms
267clause span variable (Clause value vars mtch) =
268 CaseClause () pattern <$> match span (matchSubst (zip vars vars') mtch)
269 where
270 vars' = map (\n -> variable ++ "._" ++ show n) [0..]
271 pattern = case value of
272 Right (Boolean b) -> BoolLit () b
273 Right lit -> literal lit
274 Left name -> string $ case List.elemIndices '.' name of
275 [] -> name
276 is -> drop (last is + 1) name
279jsModule :: MetadataModule () () -> String
280jsModule modul =
281 show . prettyPrint $ setup (Just "Elm") (names modul ++ ["make"]) ++
282 [ assign ("Elm" : names modul ++ ["make"]) (function ["elm"] programStmts) ]
283 where
284 thisModule = dotSep ("elm" : names modul ++ ["values"])
285 programStmts =
286 concat [ setup (Just "elm") (names modul ++ ["values"])
287 , [ IfSingleStmt () thisModule (ReturnStmt () (Just thisModule)) ]
288 , [ internalImports (List.intercalate "." (names modul)) ]
289 , concatMap jsImport (imports modul)
290 , concatMap importEvent (foreignImports modul)
291 , [ assign ["_op"] (ObjectLit () []) ]
292 , concat $ evalState (mapM definition . fst . SD.flattenLets [] $ program modul) 0
293 , map exportEvent $ foreignExports modul
294 , [ jsExports ]
295 , [ ReturnStmt () (Just thisModule) ]
296 ]
298 jsExports = assign ("elm" : names modul ++ ["values"]) (ObjectLit () exs)
299 where
300 exs = map entry . filter (not . isOp) $ "_op" : exports modul
301 entry x = (PropId () (var x), ref x)
303 assign path expr =
304 case path of
305 [x] -> VarDeclStmt () [ varDecl x expr ]
306 _ -> ExprStmt () $
307 AssignExpr () OpAssign (LDot () (dotSep (init path)) (last path)) expr
309 jsImport (modul,_) = setup Nothing path ++ [ include ]
310 where
311 path = split modul
312 include = assign path $ dotSep ("Elm" : path ++ ["make"]) <| ref "elm"
314 setup namespace path = map create paths
315 where
316 create name = assign name (InfixExpr () OpLOr (dotSep name) (ObjectLit () []))
317 paths = case namespace of
318 Nothing -> tail . init $ List.inits path
319 Just nmspc -> drop 2 . init . List.inits $ nmspc : path
321 addId js = InfixExpr () OpAdd (string (js++"_")) (obj "elm.id")
323 importEvent (js,base,elm,_) =
324 [ VarDeclStmt () [ varDecl elm $ obj "Signal.constant" <| evalState (expression base) 0 ]
325 , ExprStmt () $
326 obj "document.addEventListener" `call`
327 [ addId js
328 , function ["e"]
329 [ ExprStmt () $ obj "elm.notify" `call` [dotSep [elm,"id"], obj "e.value"] ]
330 ]
331 ]
333 exportEvent (js,elm,_) =
334 ExprStmt () $
335 ref "A2" `call`
336 [ obj "Signal.lift"
337 , function ["v"]
338 [ VarDeclStmt () [varDecl "e" $ obj "document.createEvent" <| string "Event"]
339 , ExprStmt () $
340 obj "e.initEvent" `call` [ addId js, BoolLit () True, BoolLit () True ]
341 , ExprStmt () $ AssignExpr () OpAssign (LDot () (ref "e") "value") (ref "v")
342 , ExprStmt () $ obj "document.dispatchEvent" <| ref "e"
343 , ReturnStmt () (Just $ ref "v")
344 ]
345 , ref elm ]
347binop span op e1 e2 =
348 case op of
349 "Basics.." ->
350 do es <- mapM expression (e1 : collect [] e2)
351 return $ ["$"] ==> foldr (<|) (ref "$") es
352 "Basics.<|" ->
353 do e2' <- expression e2
354 es <- mapM expression (collect [] e1)
355 return $ foldr (<|) e2' es
356 "List.++" ->
357 do e1' <- expression e1
358 e2' <- expression e2
359 return $ obj "_L.append" `call` [e1', e2']
360 "::" -> expression (L span (Data "::" [e1,e2]))
361 _ ->
362 do e1' <- expression e1
363 e2' <- expression e2
364 return $ case Map.lookup op opDict of
365 Just f -> f e1' e2'
366 Nothing -> ref "A2" `call` [ func, e1', e2' ]
367 where
368 collect es e =
369 case e of
370 L _ (Binop op e1 e2) | op == "Basics.." -> collect (es ++ [e1]) e2
371 _ -> es ++ [e]
373 js1 = expression e1
374 js2 = expression e2
376 func | isOp operator = BracketRef () (dotSep (init parts ++ ["_op"])) (string operator)
377 | otherwise = dotSep parts
378 where
379 parts = split op
380 operator = last parts
382 opDict = Map.fromList (infixOps ++ specialOps)
384 specialOp str func = [ (str, func), ("Basics." ++ str, func) ]
385 infixOp str op = specialOp str (InfixExpr () op)
387 infixOps = concat
388 [ infixOp "+" OpAdd
389 , infixOp "-" OpSub
390 , infixOp "*" OpMul
391 , infixOp "/" OpDiv
392 , infixOp "&&" OpLAnd
393 , infixOp "||" OpLOr
394 ]
396 specialOps = concat
397 [ specialOp "^" $ \a b -> obj "Math.pow" `call` [a,b]
398 , specialOp "|>" $ flip (<|)
399 , specialOp "==" $ \a b -> obj "_N.eq" `call` [a,b]
400 , specialOp "/=" $ \a b -> PrefixExpr () PrefixLNot (obj "_N.eq" `call` [a,b])
401 , specialOp "<" $ cmp OpLT 0
402 , specialOp ">" $ cmp OpGT 0
403 , specialOp "<=" $ cmp OpLT 1
404 , specialOp ">=" $ cmp OpGT (-1)
405 , specialOp "div" $ \a b -> InfixExpr () OpBOr (InfixExpr () OpDiv a b) (IntLit () 0)
406 ]
408 cmp op n a b = InfixExpr () op (obj "_N.cmp" `call` [a,b]) (IntLit () n)