remove big mutual blocks in parser
This commit is contained in:
parent
adebfe090c
commit
b5f42cde64
1 changed files with 211 additions and 208 deletions
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@ -189,10 +189,6 @@ data PCasePat =
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| PBox BName
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%runElab derive "PCasePat" [Eq, Ord, Show]
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public export
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PCaseArm : Type
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PCaseArm = (PCasePat, PTerm)
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||| either `zero` or `0`
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export
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zeroPat : Grammar True ()
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@ -210,6 +206,174 @@ casePat =
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<|> delim "[" "]" [|PBox patVar|]
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<|> fatalError "invalid pattern"
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export covering
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term : Grammar True PTerm
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export covering
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typeLine : Grammar True (BName, PTerm)
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typeLine = do
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resC "["
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mustWork $ do
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i <- option Nothing $ patVar <* resC "⇒"
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t <- term <* needRes "]"
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pure (i, t)
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||| box term `[t]` or type `[π.A]`
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export covering
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boxTerm : Grammar True PTerm
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boxTerm = do
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res "["; commit
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q <- optional $ qty <* res "."
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t <- mustWork $ term <* 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 covering
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tupleTerm : Grammar True PTerm
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tupleTerm = foldr1 Pair <$> delimSep1 "(" ")" "," term
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||| argument/atomic term: single-token terms, or those with delimiters e.g.
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||| `[t]`
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export covering
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termArg : Grammar True PTerm
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termArg = [|TYPE universe1|]
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<|> [|Enum enumType|]
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<|> [|Tag tag|]
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<|> boxTerm
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<|> Nat <$ 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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<|> tupleTerm
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export covering
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coeTerm : Grammar True PTerm
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coeTerm = resC "coe" *> mustWork [|Coe typeLine dimArg dimArg termArg|]
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export covering
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compBranch : Grammar True (DimConst, BName, PTerm)
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compBranch = [|(,,) dimConst patVar (needRes "⇒" *> term)|]
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export covering
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compTerm : Grammar True PTerm
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compTerm = do
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resC "comp"
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mustWork $ do
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a <- typeLine
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p <- dimArg; q <- dimArg
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s <- termArg; r <- dimArg
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needRes "{"
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s0 <- compBranch; needRes ";"
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s1 <- compBranch; optRes ";"
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needRes "}"
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case (fst s0, fst s1) of
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(Zero, One) => pure $ Comp a p q s r (snd s0) (snd s1)
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(One, Zero) => pure $ Comp a p q s r (snd s1) (snd s0)
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(_, _) =>
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fatalError "body of 'comp' needs one 0 case and one 1 case"
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export covering
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splitUniverseTerm : Grammar True PTerm
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splitUniverseTerm = resC "★" *> mustWork [|TYPE nat|]
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export covering
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eqTerm : Grammar True PTerm
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eqTerm = resC "Eq" *> mustWork [|Eq typeLine termArg termArg|]
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export covering
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succTerm : Grammar True PTerm
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succTerm = resC "succ" *> mustWork [|Succ termArg|]
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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 covering
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anyArg : Grammar True (Either PDim PTerm)
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anyArg = dimArg <||> termArg
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export covering
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normalAppTerm : Grammar True PTerm
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normalAppTerm = foldl ap <$> termArg <*> many anyArg
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where ap : PTerm -> Either PDim PTerm -> PTerm
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ap f (Left p) = f :% p
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ap f (Right s) = f :@ s
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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 covering
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appTerm : Grammar True PTerm
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appTerm = coeTerm
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<|> compTerm
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<|> splitUniverseTerm
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<|> eqTerm
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<|> succTerm
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<|> normalAppTerm
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export covering
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infixEqTerm : Grammar True PTerm
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infixEqTerm = do
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l <- appTerm; commit
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rest <- optional $ res "≡" *> [|(,) term (needRes ":" *> appTerm)|]
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pure $ maybe l (\rest => Eq (Nothing, snd rest) l (fst rest)) rest
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export covering
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annTerm : Grammar True PTerm
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annTerm = do
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tm <- infixEqTerm; commit
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ty <- optional $ res "∷" *> term
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pure $ maybe tm (tm :#) ty
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export covering
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lamTerm : Grammar True PTerm
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lamTerm = 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; needRes "⇒"
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body <- term; commit
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pure $ foldr k body xs
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-- [todo] fix the backtracking in e.g. (F x y z × B)
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export covering
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properBinders : Grammar True (List1 BName, PTerm)
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properBinders = do
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res "("
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xs <- some patVar; resC ":"
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t <- term; needRes ")"
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pure (xs, t)
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export covering
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piTerm : Grammar True PTerm
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piTerm = do
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q <- qty; resC "."
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dom <- piBinder; needRes "→"
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cod <- term; commit
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pure $ foldr (\x => Pi q x (snd dom)) cod (fst dom)
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where
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piBinder : Grammar True (List1 BName, PTerm)
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piBinder = properBinders <|> [|(singleton Nothing,) termArg|]
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export covering
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sigmaTerm : Grammar True PTerm
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sigmaTerm =
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(properBinders >>= continueDep)
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<|> (annTerm >>= continueNondep)
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where
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continueDep : (List1 BName, PTerm) -> Grammar True PTerm
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continueDep (names, dom) = do
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cod <- needRes "×" *> sigmaTerm
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pure $ foldr (\x => Sig x dom) cod names
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continueNondep : PTerm -> Grammar False PTerm
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continueNondep dom = do
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rest <- optional $ resC "×" *> sepBy1 (res "×") annTerm
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Core.pure $ foldr1 (Sig Nothing) $ dom ::: maybe [] forget 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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checkCaseArms : List PCaseArm -> Grammar False PCaseBody
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checkCaseArms [] =
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@ -235,191 +399,29 @@ checkCaseArms ((PBox x, rhs) :: rest) = do
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let [] = rest | _ => fatalError "unexpected pattern after box"
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pure $ CaseBox x rhs
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export covering
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caseArm : Grammar True PCaseArm
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caseArm = [|(,) casePat (needRes "⇒" *> term)|]
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mutual
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export covering
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typeLine : Grammar True (BName, PTerm)
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typeLine = do
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resC "["
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mustWork $ do
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i <- option Nothing $ patVar <* resC "⇒"
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t <- term <* needRes "]"
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pure (i, t)
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export covering
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caseBody : Grammar True PCaseBody
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caseBody = delimSep "{" "}" ";" caseArm >>= checkCaseArms
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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 covering
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termArg : Grammar True PTerm
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termArg = [|TYPE universe1|]
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<|> [|Enum enumType|]
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<|> [|Tag tag|]
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<|> boxTerm
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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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<|> tupleTerm
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export covering
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caseTerm : Grammar True PTerm
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caseTerm = do
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qty <- caseIntro; commit
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head <- mustWork term; needRes "return"
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ret <- mustWork [|(,) (option Nothing $ patVar <* resC "⇒") term|]
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needRes "of"
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body <- mustWork caseBody
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pure $ Case qty head ret body
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||| box term `[t]` or type `[π.A]`
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export covering
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boxTerm : Grammar True PTerm
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boxTerm = do
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res "["; commit
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q <- optional $ qty <* res "."
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t <- mustWork $ term <* 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 covering
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tupleTerm : Grammar True PTerm
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tupleTerm = foldr1 Pair <$> delimSep1 "(" ")" "," term
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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 covering
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appTerm : Grammar True PTerm
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appTerm = coeTerm
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<|> compTerm
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<|> splitUniverseTerm
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<|> eqTerm
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<|> succTerm
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<|> normalAppTerm
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export covering
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coeTerm : Grammar True PTerm
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coeTerm = resC "coe" *> mustWork [|Coe typeLine dimArg dimArg termArg|]
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export covering
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compTerm : Grammar True PTerm
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compTerm = do
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resC "comp"
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mustWork $ do
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a <- typeLine
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p <- dimArg; q <- dimArg
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s <- termArg; r <- dimArg
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needRes "{"
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s0 <- compBranch; needRes ";"
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s1 <- compBranch; optRes ";"
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needRes "}"
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case (fst s0, fst s1) of
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(Zero, One) => pure $ Comp a p q s r (snd s0) (snd s1)
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(One, Zero) => pure $ Comp a p q s r (snd s1) (snd s0)
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(_, _) =>
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fatalError "body of 'comp' needs one 0 case and one 1 case"
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export covering
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compBranch : Grammar True (DimConst, BName, PTerm)
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compBranch = [|(,,) dimConst patVar (needRes "⇒" *> term)|]
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export covering
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splitUniverseTerm : Grammar True PTerm
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splitUniverseTerm = resC "★" *> mustWork [|TYPE nat|]
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export covering
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eqTerm : Grammar True PTerm
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eqTerm = resC "Eq" *> mustWork [|Eq typeLine termArg termArg|]
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export covering
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succTerm : Grammar True PTerm
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succTerm = resC "succ" *> mustWork [|Succ termArg|]
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export covering
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normalAppTerm : Grammar True PTerm
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normalAppTerm = foldl ap <$> termArg <*> many anyArg
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where ap : PTerm -> Either PDim PTerm -> PTerm
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ap f (Left p) = f :% p
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ap f (Right s) = f :@ s
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||| a dimension argument with an `@` prefix, or
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||| a term argument with no prefix
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export covering
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anyArg : Grammar True (Either PDim PTerm)
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anyArg = dimArg <||> termArg
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export covering
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term : Grammar True PTerm
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term = lamTerm
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<|> caseTerm
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<|> piTerm
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<|> sigmaTerm
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export covering
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lamTerm : Grammar True PTerm
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lamTerm = do
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k <- DLam <$ res "δ" <|> Lam <$ res "λ"
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mustWork $ do
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xs <- some patVar; needRes "⇒"
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body <- term; commit
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pure $ foldr k body xs
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export covering
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piTerm : Grammar True PTerm
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piTerm = do
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q <- qty; resC "."
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dom <- piBinder; needRes "→"
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cod <- term; commit
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pure $ foldr (\x => Pi q x (snd dom)) cod (fst dom)
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where
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piBinder : Grammar True (List1 BName, PTerm)
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piBinder = properBinders <|> [|(singleton Nothing,) termArg|]
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-- [todo] fix the backtracking in e.g. (F x y z × B)
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export covering
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properBinders : Grammar True (List1 BName, PTerm)
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properBinders = do
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res "("
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xs <- some patVar; resC ":"
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t <- term; needRes ")"
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pure (xs, t)
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export covering
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sigmaTerm : Grammar True PTerm
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sigmaTerm =
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(properBinders >>= continueDep)
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<|> (annTerm >>= continueNondep)
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where
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continueDep : (List1 BName, PTerm) -> Grammar True PTerm
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continueDep (names, dom) = do
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cod <- needRes "×" *> sigmaTerm
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pure $ foldr (\x => Sig x dom) cod names
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continueNondep : PTerm -> Grammar False PTerm
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continueNondep dom = do
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rest <- optional $ resC "×" *> sepBy1 (res "×") annTerm
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Core.pure $ foldr1 (Sig Nothing) $ dom ::: maybe [] forget rest
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export covering
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annTerm : Grammar True PTerm
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annTerm = do
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tm <- infixEqTerm; commit
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ty <- optional $ res "∷" *> term
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pure $ maybe tm (tm :#) ty
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export covering
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infixEqTerm : Grammar True PTerm
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infixEqTerm = do
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l <- appTerm; commit
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rest <- optional $ res "≡" *> [|(,) term (needRes ":" *> appTerm)|]
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pure $ maybe l (\rest => Eq (Nothing, snd rest) l (fst rest)) rest
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export covering
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caseTerm : Grammar True PTerm
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caseTerm = do
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qty <- caseIntro; commit
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head <- mustWork term; needRes "return"
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ret <- mustWork [|(,) (option Nothing $ patVar <* resC "⇒") term|]
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needRes "of"
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body <- mustWork caseBody
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pure $ Case qty head ret body
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export covering
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caseBody : Grammar True PCaseBody
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caseBody = delimSep "{" "}" ";" caseArm >>= checkCaseArms
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export covering
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caseArm : Grammar True PCaseArm
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caseArm = [|(,) casePat (needRes "⇒" *> term)|]
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term = lamTerm
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<|> caseTerm
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<|> piTerm
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<|> sigmaTerm
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||| `def` alone means `defω`
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@ -429,31 +431,32 @@ defIntro = Zero <$ resC "def0"
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<|> Any <$ resC "defω"
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<|> resC "def" *> option Any (qty <* needRes ".")
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mutual
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export covering
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definition : Grammar True PDefinition
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definition = do
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qty <- defIntro
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name <- baseName
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type <- optional $ resC ":" *> mustWork term
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term <- needRes "=" *> mustWork term
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optRes ";"
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pure $ MkPDef {qty, name, type, term}
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export covering
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namespace_ : Grammar True PNamespace
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namespace_ = do
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ns <- resC "namespace" *> qname; needRes "{"
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decls <- nsInner; optRes ";"
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pure $ MkPNamespace (ns.mods :< ns.base) decls
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where
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nsInner : Grammar True (List PDecl)
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nsInner = [] <$ resC "}"
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<|> [|(decl <* commit) :: nsInner|]
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export covering
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decl : Grammar True PDecl
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export covering
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decl : Grammar True PDecl
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decl = [|PDef definition|] <|> [|PNs namespace_|]
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export covering
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definition : Grammar True PDefinition
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definition = do
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qty <- defIntro
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name <- baseName
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type <- optional $ resC ":" *> mustWork term
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term <- needRes "=" *> mustWork term
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optRes ";"
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pure $ MkPDef {qty, name, type, term}
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export covering
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namespace_ : Grammar True PNamespace
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namespace_ = do
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ns <- resC "namespace" *> qname; needRes "{"
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decls <- nsInner; optRes ";"
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pure $ MkPNamespace (ns.mods :< ns.base) decls
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where
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nsInner : Grammar True (List PDecl)
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nsInner = [] <$ resC "}"
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<|> [|(decl <* commit) :: nsInner|]
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decl = [|PDef definition|] <|> [|PNs namespace_|]
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export covering
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load : Grammar True String
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