259 lines
8.9 KiB
Plaintext
259 lines
8.9 KiB
Plaintext
{
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{-|
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Module : Core.Parse
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Description : Parser for the Core language
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-}
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{-# LANGUAGE OverloadedStrings, ViewPatterns #-}
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module Core.Parse
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( parseCore
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, parseCoreExpr
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, parseCoreExprR
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, parseCoreProg
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, parseCoreProgR
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, module Core.Lex -- temp convenience
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, SrcError
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)
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where
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import Control.Monad ((>=>))
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import Control.Monad.Utils (generalise)
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import Data.Foldable (foldl')
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import Data.Functor.Identity
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import Core.Syntax
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import Core.Lex
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import Compiler.RLPC
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import Control.Monad
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import Control.Lens hiding (snoc)
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import Data.Default.Class (def)
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import Data.Hashable (Hashable)
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import Data.List.Extra
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import Data.Text.IO qualified as TIO
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import Data.Text (Text)
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import Data.Text qualified as T
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import Data.HashMap.Strict qualified as H
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}
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%name parseCoreExpr StandaloneExpr
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%name parseCoreProg StandaloneProgram
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%tokentype { Located CoreToken }
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%error { parseError }
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%monad { RLPC } { happyBind } { happyPure }
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%token
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let { Located _ TokenLet }
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letrec { Located _ TokenLetrec }
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where { Located _ TokenWhere }
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case { Located _ TokenCase }
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of { Located _ TokenOf }
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pack { Located _ TokenPack } -- temp
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in { Located _ TokenIn }
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litint { Located _ (TokenLitInt $$) }
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varname { Located _ (TokenVarName $$) }
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varsym { Located _ (TokenVarSym $$) }
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conname { Located _ (TokenConName $$) }
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consym { Located _ (TokenConSym $$) }
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alttag { Located _ (TokenAltTag $$) }
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word { Located _ (TokenWord $$) }
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'λ' { Located _ TokenLambda }
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'->' { Located _ TokenArrow }
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'=' { Located _ TokenEquals }
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'@' { Located _ TokenTypeApp }
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'(' { Located _ TokenLParen }
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')' { Located _ TokenRParen }
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'{' { Located _ TokenLBrace }
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'}' { Located _ TokenRBrace }
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'{-#' { Located _ TokenLPragma }
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'#-}' { Located _ TokenRPragma }
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';' { Located _ TokenSemicolon }
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'::' { Located _ TokenHasType }
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eof { Located _ TokenEOF }
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%%
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Eof :: { () }
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Eof : eof { () }
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| error { () }
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StandaloneProgram :: { Program Var }
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StandaloneProgram : Program eof { $1 }
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Program :: { Program Var }
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Program : ScTypeSig ';' Program { insTypeSig $1 $3 }
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| ScTypeSig OptSemi { singletonTypeSig $1 }
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| ScDef ';' Program { insScDef $1 $3 }
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| ScDef OptSemi { singletonScDef $1 }
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| TLPragma Program {% doTLPragma $1 $2 }
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| TLPragma {% doTLPragma $1 mempty }
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TLPragma :: { Pragma }
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: '{-#' Words '#-}' { Pragma $2 }
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Words :: { [Text] }
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: Words word { $1 `snoc` $2 }
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| word { [$1] }
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OptSemi :: { () }
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OptSemi : ';' { () }
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| {- epsilon -} { () }
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ScTypeSig :: { (Name, Type) }
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ScTypeSig : Id '::' Type { ($1, $3 TyKindType) }
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ScDefs :: { [ScDef PsName] }
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ScDefs : ScDef ';' ScDefs { $1 : $3 }
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| ScDef ';' { [$1] }
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| ScDef { [$1] }
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ScDef :: { ScDef PsName }
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ScDef : Id ParList '=' Expr { ScDef ($1,Nothing) $2 $4 }
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Type :: { [(Name, Kind)] -> Kind -> Type }
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: Type1 '->' Type { \cases
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g TyKindType ->
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$1 g TyKindType :-> $3 g TyKindType
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_ _ -> error "kind mismatch" }
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| Type1 { $1 }
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-- do we want to allow symbolic names for tyvars and tycons?
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Type1 :: { [(Name, Kind)] -> Kind -> Type }
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Type1 : '(' Type ')' { $2 }
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| varname { \k -> TyVar $ MkVar $1 k }
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| conname { \k -> TyCon $ MkTyCon $1 k }
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ParList :: { [PsName] }
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ParList : varname ParList { ($1, Nothing) : $2 }
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| {- epsilon -} { [] }
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StandaloneExpr :: { Expr Var }
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StandaloneExpr : Expr eof { $1 }
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Expr :: { Expr Var }
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Expr : LetExpr { $1 }
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| 'λ' Binders '->' Expr { Lam $2 $4 }
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| Application { $1 }
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| CaseExpr { $1 }
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| Expr1 { $1 }
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LetExpr :: { Expr Var }
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LetExpr : let '{' Bindings '}' in Expr { Let NonRec $3 $6 }
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| letrec '{' Bindings '}' in Expr { Let Rec $3 $6 }
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Binders :: { [Var] }
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Binders : Var Binders { $1 : $2 }
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| Var { [$1] }
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Application :: { Expr Var }
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Application : Application AppArg { App $1 $2 }
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| Expr1 AppArg { App $1 $2 }
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AppArg :: { Expr Var }
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: '@' Type1 { Type ($2 [] TyKindInferred) }
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| Expr1 { $1 }
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CaseExpr :: { Expr Var }
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CaseExpr : case Expr of '{' Alters '}' { Case $2 $5 }
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Alters :: { [Alter Var] }
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Alters : Alter ';' Alters { $1 : $3 }
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| Alter ';' { [$1] }
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| Alter { [$1] }
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Alter :: { Alter Var }
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Alter : alttag AltParList '->' Expr { Alter (AltTag $1) $2 $4 }
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| conname AltParList '->' Expr { Alter (AltData $1) $2 $4 }
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AltParList :: { [Var] }
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: Var AltParList { $1 : $2 }
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| {- epsilon -} { [] }
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Expr1 :: { Expr Var }
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Expr1 : litint { Lit $ IntL $1 }
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| Id { Var $1 }
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| PackCon { $1 }
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| '(' Expr ')' { $2 }
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PackCon :: { Expr Var }
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PackCon : pack '{' litint litint '}' { Con $3 $4 }
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Bindings :: { [Binding Var] }
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Bindings : Binding ';' Bindings { $1 : $3 }
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| Binding ';' { [$1] }
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| Binding { [$1] }
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Binding :: { Binding Var }
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Binding : Var '=' Expr { $1 := $3 }
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Id :: { Name }
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: varname { $1 }
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| conname { $1 }
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Var :: { Var }
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Var : '(' varname '::' Type ')' { MkVar $2 ($4 [] TyKindType) }
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{
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parseError :: [Located CoreToken] -> RLPC a
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parseError (Located _ t : _) =
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error $ "<line>" <> ":" <> "<col>"
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<> ": parse error at token `" <> show t <> "'"
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{-# WARNING parseError "unimpl" #-}
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exprPragma :: [String] -> RLPC (Expr Var)
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exprPragma ("AST" : e) = undefined
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exprPragma _ = undefined
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{-# WARNING exprPragma "unimpl" #-}
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astPragma :: [String] -> RLPC (Expr Var)
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astPragma _ = undefined
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{-# WARNING astPragma "unimpl" #-}
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insTypeSig :: (Hashable b) => (b, Type) -> Program b -> Program b
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insTypeSig ts = programTypeSigs %~ uncurry H.insert ts
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singletonTypeSig :: (Hashable b) => (b, Type) -> Program b
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singletonTypeSig ts = insTypeSig ts mempty
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insScDef :: (Hashable b) => ScDef b -> Program b -> Program b
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insScDef sc = programScDefs %~ (sc:)
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singletonScDef :: (Hashable b) => ScDef b -> Program b
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singletonScDef sc = insScDef sc mempty
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parseCoreExprR :: (Monad m) => [Located CoreToken] -> RLPCT m (Expr Var)
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parseCoreExprR = hoistRlpcT generalise . parseCoreExpr
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parseCoreProgR :: forall m. (Monad m) => [Located CoreToken] -> RLPCT m (Program Var)
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parseCoreProgR = ddumpast <=< (hoistRlpcT generalise . parseCoreProg)
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where
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ddumpast :: (Program Var) -> RLPCT m (Program Var)
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ddumpast p = do
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addDebugMsg "dump-parsed-core" . show $ p
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pure p
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happyBind :: RLPC a -> (a -> RLPC b) -> RLPC b
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happyBind m k = m >>= k
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happyPure :: a -> RLPC a
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happyPure a = pure a
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doTLPragma :: Pragma -> Program' -> RLPC Program'
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-- TODO: warn unrecognised pragma
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doTLPragma (Pragma []) p = pure p
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doTLPragma (Pragma pr) p = case pr of
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-- TODO: warn on overwrite
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["PackData", n, readt -> t, readt -> a] ->
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pure $ p & programDataTags . at n ?~ (t,a)
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readt :: (Read a) => Text -> a
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readt = read . T.unpack
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type PsName = (Name, Maybe Type)
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}
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