573 lines
17 KiB
Idris
573 lines
17 KiB
Idris
module Quox.Parser.Parser
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import public Quox.Parser.Lexer
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import public Quox.Parser.Syntax
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import Data.Bool
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import Data.Fin
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import Data.Vect
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import public Text.Parser
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import Derive.Prelude
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%language ElabReflection
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%default total
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public export
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0 Grammar : Bool -> Type -> Type
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Grammar = Core.Grammar () Token
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%hide Core.Grammar
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public export
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data Error =
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LexError Lexer.Error
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| ParseError (List1 (ParsingError Token))
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%hide Lexer.Error
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%runElab derive "Error" [Show]
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export
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lexParseWith : {c : Bool} -> Grammar c a -> String -> Either Error a
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lexParseWith grm input = do
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toks <- mapFst LexError $ lex input
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bimap ParseError fst $ parse (grm <* eof) toks
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export
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withLoc : {c : Bool} -> FileName -> (Grammar c (Loc -> a)) -> Grammar c a
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withLoc fname act = bounds act <&> \res =>
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if res.isIrrelevant then res.val noLoc
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else res.val $ makeLoc fname res.bounds
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export
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defLoc : FileName -> (Loc -> a) -> Grammar False a
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defLoc fname f = position <&> f . makeLoc fname
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export
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unused : FileName -> Grammar False PatVar
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unused fname = defLoc fname Unused
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||| reserved token, like punctuation or keywords etc
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export
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res : (str : String) -> (0 _ : IsReserved str) => Grammar True ()
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res str = terminal "expected \"\{str}\"" $ guard . (== Reserved str)
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||| optional reserved token, e.g. trailing comma
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export
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optRes : (str : String) -> (0 _ : IsReserved str) => Grammar False ()
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optRes str = ignore $ optional $ res str
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||| reserved token, then commit
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export
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resC : (str : String) -> (0 _ : IsReserved str) => Grammar True ()
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resC str = do res str; commit
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||| reserved token or fatal error
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export
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needRes : (str : String) -> (0 _ : IsReserved str) => Grammar True ()
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needRes str = resC str <|> fatalError "expected \"\{str}\""
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private
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terminalMatchN_ : String -> List (TTImp, TTImp) -> Elab (Grammar True a)
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terminalMatchN_ what matches = do
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func <- check $ lam (lambdaArg `{x}) $
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iCase `(x) implicitFalse $
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map (\(l, r) => patClause l `(Just ~(r))) matches ++
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[patClause `(_) `(Nothing)]
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pure $ terminal "expected \{what}" func
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private %macro
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terminalMatchN : String -> List (TTImp, TTImp) -> Elab (Grammar True a)
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terminalMatchN = terminalMatchN_
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private %macro
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terminalMatch : String -> TTImp -> TTImp -> Elab (Grammar True a)
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terminalMatch what l r = terminalMatchN_ what [(l, r)]
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||| tag without leading `'`
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export
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bareTag : Grammar True TagVal
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bareTag = terminalMatchN "bare tag" [(`(Name t), `(show t)), (`(Str s), `(s))]
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||| tag with leading quote
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export
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tag : Grammar True TagVal
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tag = terminalMatch "tag" `(Tag t) `(t)
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||| natural number
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export
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nat : Grammar True Nat
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nat = terminalMatch "natural number" `(Nat n) `(n)
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||| string literal
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export
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strLit : Grammar True String
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strLit = terminalMatch "string literal" `(Str s) `(s)
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||| single-token universe, like ★₀ or Type1
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export
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universe1 : Grammar True Universe
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universe1 = terminalMatch "universe" `(TYPE u) `(u)
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||| possibly-qualified name
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export
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qname : Grammar True PName
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qname = terminalMatch "name" `(Name n) `(n)
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||| unqualified name
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export
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baseName : Grammar True PBaseName
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baseName = terminalMatch "unqualified name" `(Name (MakePName [<] b)) `(b)
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||| dimension constant (0 or 1)
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export
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dimConst : Grammar True DimConst
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dimConst = terminalMatchN "dimension constant"
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[(`(Nat 0), `(Zero)), (`(Nat 1), `(One))]
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||| quantity (0, 1, or ω)
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export
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qtyVal : Grammar True Qty
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qtyVal = terminalMatchN "quantity"
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[(`(Nat 0), `(Zero)), (`(Nat 1), `(One)), (`(Reserved "ω"), `(Any))]
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||| quantity (0, 1, or ω)
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export
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qty : FileName -> Grammar True PQty
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qty fname = withLoc fname [|PQ qtyVal|]
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||| pattern var (unqualified name or _)
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export
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patVar : FileName -> Grammar True PatVar
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patVar fname = withLoc fname $
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[|PV baseName|] <|> Unused <$ res "_"
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||| dimension (without `@` prefix)
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export
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dim : FileName -> Grammar True PDim
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dim fname = withLoc fname $ [|K dimConst|] <|> [|V baseName|]
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||| dimension argument (with @)
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export
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dimArg : FileName -> Grammar True PDim
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dimArg fname = do resC "@"; mustWork $ dim fname
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delim : (o, c : String) -> (0 _ : IsReserved o) => (0 _ : IsReserved c) =>
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{k : Bool} -> Grammar k a -> Grammar True a
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delim o c p = resC o *> p <* needRes c
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-- this stuff is Like This (rather than just being delim + sepEndBy{1})
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-- so that it checks for the close bracket before trying another list element,
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-- giving (imo) a better error
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parameters (o, c, s : String)
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{auto 0 _ : IsReserved o} {auto 0 _ : IsReserved c}
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{auto 0 _ : IsReserved s}
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(p : Grammar True a)
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private
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dsBeforeDelim, dsAfterDelim : Grammar True (List a)
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dsBeforeDelim = [] <$ resC c <|> resC s *> assert_total dsAfterDelim
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dsAfterDelim = [] <$ resC c <|> [|p :: assert_total dsBeforeDelim|]
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export
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delimSep1 : Grammar True (List1 a)
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delimSep1 = resC o *> [|p ::: dsBeforeDelim|]
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export
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delimSep : Grammar True (List a)
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delimSep = resC o *> dsAfterDelim
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||| enum type, e.g. `{a, b, c.d, "e f g"}`
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export
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enumType : Grammar True (List TagVal)
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enumType = delimSep "{" "}" "," bareTag
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||| e.g. `case` or `case 1.`
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export
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caseIntro : FileName -> Grammar True PQty
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caseIntro fname =
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withLoc fname (PQ Zero <$ res "case0")
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<|> withLoc fname (PQ One <$ res "case1")
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<|> withLoc fname (PQ Any <$ res "caseω")
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<|> delim "case" "." (qty fname)
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export
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qtyPatVar : FileName -> Grammar True (PQty, PatVar)
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qtyPatVar fname = [|(,) (qty fname) (needRes "." *> patVar fname)|]
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export
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ptag : FileName -> Grammar True PTagVal
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ptag fname = withLoc fname $ [|PT tag|]
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public export
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data PCasePat =
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PPair PatVar PatVar Loc
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| PTag PTagVal Loc
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| PZero Loc
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| PSucc PatVar PQty PatVar Loc
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| PBox PatVar Loc
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%runElab derive "PCasePat" [Eq, Ord, Show]
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export
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Located PCasePat where
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(PPair _ _ loc).loc = loc
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(PTag _ loc).loc = loc
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(PZero loc).loc = loc
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(PSucc _ _ _ loc).loc = loc
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(PBox _ loc).loc = loc
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||| either `zero` or `0`
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export
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zeroPat : Grammar True ()
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zeroPat = resC "zero" <|> terminal "expected '0'" (guard . (== Nat 0))
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export
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casePat : FileName -> Grammar True PCasePat
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casePat fname = withLoc fname $
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delim "(" ")" [|PPair (patVar fname) (needRes "," *> patVar fname)|]
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<|> [|PTag (ptag fname)|]
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<|> PZero <$ zeroPat
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<|> do p <- resC "succ" *> patVar fname
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ih <- resC "," *> qtyPatVar fname
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<|> [|(,) (defLoc fname $ PQ Zero) (unused fname)|]
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pure $ PSucc p (fst ih) (snd ih)
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<|> delim "[" "]" [|PBox (patVar fname)|]
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<|> fatalError "invalid pattern"
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export
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term : FileName -> Grammar True PTerm
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-- defined after all the subterm parsers
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export
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typeLine : FileName -> Grammar True (PatVar, PTerm)
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typeLine fname = do
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resC "["
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mustWork $ do
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i <- patVar fname <* resC "⇒" <|> unused fname
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t <- assert_total term fname <* needRes "]"
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pure (i, t)
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||| box term `[t]` or type `[π.A]`
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export
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boxTerm : FileName -> Grammar True PTerm
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boxTerm fname = withLoc fname $ do
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res "["; commit
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q <- optional $ qty fname <* res "."
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t <- mustWork $ assert_total term fname <* needRes "]"
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pure $ maybe (Box t) (\q => BOX q t) q
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||| tuple term like `(a, b)`, or parenthesised single term.
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||| allows terminating comma. more than two elements are nested on the right:
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||| `(a, b, c, d) = (a, (b, (c, d)))`.
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export
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tupleTerm : FileName -> Grammar True PTerm
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tupleTerm fname = withLoc fname $ do
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terms <- delimSep1 "(" ")" "," $ assert_total term fname
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pure $ \loc => foldr1 (\s, t => Pair s t loc) terms
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||| argument/atomic term: single-token terms, or those with delimiters e.g.
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||| `[t]`
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export
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termArg : FileName -> Grammar True PTerm
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termArg fname = withLoc fname $
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[|TYPE universe1|]
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<|> [|Enum enumType|]
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<|> [|Tag tag|]
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<|> const <$> boxTerm fname
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<|> Nat <$ res "ℕ"
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<|> Zero <$ res "zero"
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<|> [|fromNat nat|]
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<|> [|V qname|]
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<|> const <$> tupleTerm fname
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||| optionally, two dimension arguments. if absent default to `@0 @1`
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private
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optDirection : FileName -> Grammar False (PDim, PDim)
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optDirection fname = withLoc fname $ do
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dims <- optional [|(,) (dimArg fname) (dimArg fname)|]
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pure $ \loc => fromMaybe (K Zero loc, K One loc) dims
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export
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coeTerm : FileName -> Grammar True PTerm
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coeTerm fname = withLoc fname $ do
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resC "coe"
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mustWork $ do
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line <- typeLine fname
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(p, q) <- optDirection fname
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val <- termArg fname
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pure $ Coe line p q val
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public export
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CompBranch : Type
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CompBranch = (DimConst, PatVar, PTerm)
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export
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compBranch : FileName -> Grammar True CompBranch
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compBranch fname =
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[|(,,) dimConst (patVar fname) (needRes "⇒" *> assert_total term fname)|]
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private
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checkCompTermBody : (PatVar, PTerm) -> PDim -> PDim -> PTerm -> PDim ->
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CompBranch -> CompBranch -> Bounds ->
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Grammar False (Loc -> PTerm)
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checkCompTermBody a p q s r (e0, s0) (e1, s1) bounds =
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case (e0, e1) of
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(Zero, One) => pure $ Comp a p q s r s0 s1
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(One, Zero) => pure $ Comp a p q s r s1 s0
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(_, _) =>
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fatalLoc bounds "body of 'comp' needs one 0 case and one 1 case"
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export
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compTerm : FileName -> Grammar True PTerm
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compTerm fname = withLoc fname $ do
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resC "comp"
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mustWork $ do
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a <- typeLine fname
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(p, q) <- optDirection fname
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s <- termArg fname; r <- dimArg fname
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bodyStart <- bounds $ needRes "{"
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s0 <- compBranch fname; needRes ";"
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s1 <- compBranch fname; optRes ";"
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bodyEnd <- bounds $ needRes "}"
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let body = bounds $ mergeBounds bodyStart bodyEnd
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checkCompTermBody a p q s r s0 s1 body
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export
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splitUniverseTerm : FileName -> Grammar True PTerm
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splitUniverseTerm fname = withLoc fname $ resC "★" *> mustWork [|TYPE nat|]
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export
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eqTerm : FileName -> Grammar True PTerm
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eqTerm fname = withLoc fname $
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resC "Eq" *> mustWork [|Eq (typeLine fname) (termArg fname) (termArg fname)|]
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export
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succTerm : FileName -> Grammar True PTerm
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succTerm fname = withLoc fname $
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resC "succ" *> mustWork [|Succ (termArg fname)|]
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||| a dimension argument with an `@` prefix, or
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||| a term argument with no prefix
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export
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anyArg : FileName -> Grammar True (Either PDim PTerm)
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anyArg fname = dimArg fname <||> termArg fname
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export
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normalAppTerm : FileName -> Grammar True PTerm
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normalAppTerm fname = withLoc fname $ do
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head <- termArg fname
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args <- many $ anyArg fname
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pure $ \loc => foldl (ap loc) head args
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where ap : Loc -> PTerm -> Either PDim PTerm -> PTerm
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ap loc f (Left p) = DApp f p loc
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ap loc f (Right s) = App f s loc
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||| application term `f x @y z`, or other terms that look like application
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||| like `succ` or `coe`.
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export
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appTerm : FileName -> Grammar True PTerm
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appTerm fname =
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coeTerm fname
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<|> compTerm fname
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<|> splitUniverseTerm fname
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<|> eqTerm fname
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<|> succTerm fname
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<|> normalAppTerm fname
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export
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infixEqTerm : FileName -> Grammar True PTerm
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infixEqTerm fname = withLoc fname $ do
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l <- appTerm fname; commit
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rest <- optional $ res "≡" *>
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[|(,) (assert_total term fname) (needRes ":" *> appTerm fname)|]
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let u = Unused $ onlyStart l.loc
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pure $ \loc => maybe l (\rest => Eq (u, snd rest) l (fst rest) loc) rest
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export
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annTerm : FileName -> Grammar True PTerm
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annTerm fname = withLoc fname $ do
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tm <- infixEqTerm fname; commit
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ty <- optional $ res "∷" *> assert_total term fname
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pure $ \loc => maybe tm (\ty => Ann tm ty loc) ty
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export
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lamTerm : FileName -> Grammar True PTerm
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lamTerm fname = withLoc fname $ do
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k <- DLam <$ res "δ" <|> Lam <$ res "λ"
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mustWork $ do
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xs <- some $ patVar fname; needRes "⇒"
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body <- assert_total term fname; commit
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pure $ \loc => foldr (\x, s => k x s loc) body xs
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-- [todo] fix the backtracking in e.g. (F x y z × B)
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export
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properBinders : FileName -> Grammar True (List1 PatVar, PTerm)
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properBinders fname = assert_total $ do
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-- putting assert_total directly on `term`, in this one function,
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-- doesn't work. i cannot tell why
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res "("
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xs <- some $ patVar fname; resC ":"
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t <- term fname; needRes ")"
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pure (xs, t)
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export
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piTerm : FileName -> Grammar True PTerm
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piTerm fname = withLoc fname $ do
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q <- qty fname; resC "."
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dom <- piBinder; needRes "→"
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cod <- assert_total term fname; commit
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pure $ \loc => foldr (\x, t => Pi q x (snd dom) t loc) cod (fst dom)
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where
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piBinder : Grammar True (List1 PatVar, PTerm)
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piBinder = properBinders fname
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<|> [|(,) [|singleton $ unused fname|] (termArg fname)|]
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export
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sigmaTerm : FileName -> Grammar True PTerm
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sigmaTerm fname =
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(properBinders fname >>= continueDep)
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<|> (annTerm fname >>= continueNondep)
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where
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continueDep : (List1 PatVar, PTerm) -> Grammar True PTerm
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continueDep (names, fst) = withLoc fname $ do
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snd <- needRes "×" *> sigmaTerm fname
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pure $ \loc => foldr (\x, snd => Sig x fst snd loc) snd names
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cross : PTerm -> PTerm -> PTerm
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cross l r = let loc = extend' l.loc r.loc.bounds in
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Sig (Unused $ onlyStart l.loc) l r loc
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continueNondep : PTerm -> Grammar False PTerm
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continueNondep fst = do
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rest <- optional $ resC "×" *> sepBy1 (res "×") (annTerm fname)
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pure $ foldr1 cross $ fst ::: maybe [] toList rest
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public export
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PCaseArm : Type
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PCaseArm = (PCasePat, PTerm)
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export
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caseArm : FileName -> Grammar True PCaseArm
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caseArm fname =
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[|(,) (casePat fname) (needRes "⇒" *> assert_total term fname)|]
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export
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checkCaseArms : Loc -> List PCaseArm -> Grammar False PCaseBody
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checkCaseArms loc [] = pure $ CaseEnum [] loc
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checkCaseArms loc ((PPair x y _, rhs) :: rest) =
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if null rest then pure $ CasePair (x, y) rhs loc
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else fatalError "unexpected pattern after pair"
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checkCaseArms loc ((PTag tag _, rhs1) :: rest) = do
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let rest = for rest $ \case
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(PTag tag _, rhs) => Just (tag, rhs)
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_ => Nothing
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maybe (fatalError "expected all patterns to be tags")
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(\rest => pure $ CaseEnum ((tag, rhs1) :: rest) loc) rest
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checkCaseArms loc ((PZero _, rhs1) :: rest) = do
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let [(PSucc p q ih _, rhs2)] = rest
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| _ => fatalError "expected succ pattern after zero"
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pure $ CaseNat rhs1 (p, q, ih, rhs2) loc
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checkCaseArms loc ((PSucc p q ih _, rhs1) :: rest) = do
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let [(PZero _, rhs2)] = rest
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| _ => fatalError "expected zero pattern after succ"
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pure $ CaseNat rhs2 (p, q, ih, rhs1) loc
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checkCaseArms loc ((PBox x _, rhs) :: rest) =
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if null rest then pure $ CaseBox x rhs loc
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else fatalError "unexpected pattern after box"
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export
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caseBody : FileName -> Grammar True PCaseBody
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caseBody fname = do
|
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body <- bounds $ delimSep "{" "}" ";" $ caseArm fname
|
||
let loc = makeLoc fname body.bounds
|
||
checkCaseArms loc body.val
|
||
|
||
export
|
||
caseReturn : FileName -> Grammar True (PatVar, PTerm)
|
||
caseReturn fname = do
|
||
x <- patVar fname <* resC "⇒" <|> unused fname
|
||
ret <- assert_total term fname
|
||
pure (x, ret)
|
||
|
||
export
|
||
caseTerm : FileName -> Grammar True PTerm
|
||
caseTerm fname = withLoc fname $ do
|
||
qty <- caseIntro fname; commit
|
||
head <- mustWork $ assert_total term fname; needRes "return"
|
||
ret <- mustWork $ caseReturn fname; needRes "of"
|
||
body <- mustWork $ caseBody fname
|
||
pure $ Case qty head ret body
|
||
|
||
-- export
|
||
-- term : FileName -> Grammar True PTerm
|
||
term fname = lamTerm fname
|
||
<|> caseTerm fname
|
||
<|> piTerm fname
|
||
<|> sigmaTerm fname
|
||
|
||
|
||
export
|
||
decl : FileName -> Grammar True PDecl
|
||
|
||
||| `def` alone means `defω`
|
||
export
|
||
defIntro : FileName -> Grammar True PQty
|
||
defIntro fname =
|
||
withLoc fname (PQ Zero <$ resC "def0")
|
||
<|> withLoc fname (PQ Any <$ resC "defω")
|
||
<|> do pos <- bounds $ resC "def"
|
||
let any = PQ Any $ makeLoc fname pos.bounds
|
||
option any $ qty fname <* needRes "."
|
||
|
||
export
|
||
definition : FileName -> Grammar True PDefinition
|
||
definition fname = withLoc fname $ do
|
||
qty <- defIntro fname
|
||
name <- baseName
|
||
type <- optional $ resC ":" *> mustWork (term fname)
|
||
term <- needRes "=" *> mustWork (term fname)
|
||
optRes ";"
|
||
pure $ MkPDef qty name type term
|
||
|
||
export
|
||
namespace_ : FileName -> Grammar True PNamespace
|
||
namespace_ fname = withLoc fname $ do
|
||
ns <- resC "namespace" *> qname; needRes "{"
|
||
decls <- nsInner; optRes ";"
|
||
pure $ MkPNamespace (ns.mods :< ns.base) decls
|
||
where
|
||
nsInner : Grammar True (List PDecl)
|
||
nsInner = [] <$ resC "}"
|
||
<|> [|(assert_total decl fname <* commit) :: assert_total nsInner|]
|
||
|
||
decl fname = [|PDef $ definition fname|] <|> [|PNs $ namespace_ fname|]
|
||
|
||
export
|
||
load : FileName -> Grammar True PTopLevel
|
||
load fname = withLoc fname $
|
||
resC "load" *> mustWork [|PLoad strLit|] <* optRes ";"
|
||
|
||
export
|
||
topLevel : FileName -> Grammar True PTopLevel
|
||
topLevel fname = load fname <|> [|PD $ decl fname|]
|
||
|
||
export
|
||
input : FileName -> Grammar False (List PTopLevel)
|
||
input fname = [] <$ eof
|
||
<|> [|(topLevel fname <* commit) :: assert_total input fname|]
|
||
|
||
export
|
||
lexParseTerm : FileName -> String -> Either Error PTerm
|
||
lexParseTerm = lexParseWith . term
|
||
|
||
export
|
||
lexParseInput : FileName -> String -> Either Error (List PTopLevel)
|
||
lexParseInput = lexParseWith . input
|