242 lines
7.7 KiB
Idris
242 lines
7.7 KiB
Idris
module Lib.Syntax
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import Data.String
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import Data.Maybe
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import Lib.Parser.Impl
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import Lib.Prettier
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import Lib.Types
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public export
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data Raw : Type where
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public export
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data RigCount = Rig0 | RigW
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public export
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data Pattern
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= PatVar FC Icit Name
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| PatCon FC Icit Name (List Pattern)
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| PatWild FC Icit
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-- Not handling this yet, but we need to be able to work with numbers and strings...
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-- | PatLit Literal
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export
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getIcit : Pattern -> Icit
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getIcit (PatVar x icit str) = icit
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getIcit (PatCon x icit str xs) = icit
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getIcit (PatWild x icit) = icit
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export
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HasFC Pattern where
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getFC (PatVar fc _ _) = fc
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getFC (PatCon fc _ _ _) = fc
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getFC (PatWild fc _) = fc
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-- %runElab deriveShow `{Pattern}
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public export
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Constraint : Type
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Constraint = (String, Pattern)
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public export
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record Clause where
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constructor MkClause
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fc : FC
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-- I'm including the type of the left, so we can check pats and get the list of possibilities
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-- But maybe rethink what happens on the left.
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-- It's a VVar k or possibly a pattern.
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-- a pattern either is zipped out, dropped (non-match) or is assigned to rhs
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-- if we can do all three then we can have a VVar here.
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cons : List Constraint
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pats : List Pattern
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-- We'll need some context to typecheck this
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-- it has names from Pats, which will need types in the env
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expr : Raw
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-- could be a pair, but I suspect stuff will be added?
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public export
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data RCaseAlt = MkAlt Pattern Raw
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data Raw : Type where
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RVar : FC -> (nm : Name) -> Raw
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RLam : FC -> (nm : String) -> (icit : Icit) -> (ty : Raw) -> Raw
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RApp : FC -> (t : Raw) -> (u : Raw) -> (icit : Icit) -> Raw
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RU : FC -> Raw
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RPi : FC -> (nm : Maybe Name) -> (icit : Icit) -> (ty : Raw) -> (sc : Raw) -> Raw
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RLet : FC -> (nm : Name) -> (ty : Raw) -> (v : Raw) -> (sc : Raw) -> Raw
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RAnn : FC -> (tm : Raw) -> (ty : Raw) -> Raw
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RLit : FC -> Literal -> Raw
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RCase : FC -> (scrut : Raw) -> (alts : List RCaseAlt) -> Raw
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RImplicit : FC -> Raw
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RHole : FC -> Raw
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-- not used, but intended to allow error recovery
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RParseError : FC -> String -> Raw
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%name Raw tm
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export
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HasFC Raw where
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getFC (RVar fc nm) = fc
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getFC (RLam fc nm icit ty) = fc
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getFC (RApp fc t u icit) = fc
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getFC (RU fc) = fc
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getFC (RPi fc nm icit ty sc) = fc
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getFC (RLet fc nm ty v sc) = fc
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getFC (RAnn fc tm ty) = fc
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getFC (RLit fc y) = fc
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getFC (RCase fc scrut alts) = fc
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getFC (RImplicit fc) = fc
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getFC (RHole fc) = fc
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getFC (RParseError fc str) = fc
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-- derive some stuff - I'd like json, eq, show, ...
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-- FIXME - I think I don't want "where" here, but the parser has an issue
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public export
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data Decl : Type where
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data Decl
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= TypeSig FC Name Raw
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| Def FC Name (List (Raw,Raw)) -- (List Clause)
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| DImport FC Name
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| DCheck FC Raw Raw
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| Data FC Name Raw (List Decl)
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| PType FC Name (Maybe Raw)
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| PFunc FC Name Raw String
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| PMixFix FC Name Nat Fixity
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public export
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record Module where
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constructor MkModule
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name : Name
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decls : List Decl
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foo : List String -> String
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foo ts = "(" ++ unwords ts ++ ")"
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Show Literal where
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show (LString str) = foo [ "LString", show str]
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show (LInt i) = foo [ "LInt", show i]
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export
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covering
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implementation Show Raw
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export
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implementation Show Decl
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export Show Pattern
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export covering
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Show Clause where
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show (MkClause fc cons pats expr) = show (fc, cons, pats, expr)
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covering
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Show Decl where
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show (TypeSig _ str x) = foo ["TypeSig", show str, show x]
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show (Def _ str clauses) = foo ["Def", show str, show clauses]
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show (Data _ str xs ys) = foo ["Data", show str, show xs, show ys]
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show (DImport _ str) = foo ["DImport", show str]
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show (DCheck _ x y) = foo ["DCheck", show x, show y]
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show (PType _ name ty) = foo ["PType", name, show ty]
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show (PFunc _ nm ty src) = foo ["PFunc", nm, show ty, show src]
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show (PMixFix _ nm prec fix) = foo ["PMixFix", nm, show prec, show fix]
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export covering
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Show Module where
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show (MkModule name decls) = foo ["MkModule", show name, show decls]
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Show RigCount where
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show Rig0 = "Rig0"
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show RigW = "RigW"
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export
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Show Pattern where
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show (PatVar _ icit str) = foo ["PatVar", show icit, show str]
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show (PatCon _ icit str xs) = foo ["PatCon", show icit, show str, assert_total $ show xs]
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show (PatWild _ icit) = foo ["PatWild", show icit]
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covering
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Show RCaseAlt where
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show (MkAlt x y)= foo ["MkAlt", show x, assert_total $ show y]
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covering
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Show Raw where
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show (RImplicit _) = "_"
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show (RHole _) = "?"
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show (RVar _ name) = foo ["RVar", show name]
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show (RAnn _ t ty) = foo [ "RAnn", show t, show ty]
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show (RLit _ x) = foo [ "RLit", show x]
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show (RLet _ x ty v scope) = foo [ "Let", show x, " : ", show ty, " = ", show v, " in ", show scope]
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show (RPi _ str x y z) = foo [ "Pi", show str, show x, show y, show z]
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show (RApp _ x y z) = foo [ "App", show x, show y, show z]
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show (RLam _ x i y) = foo [ "Lam", show x, show i, show y]
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show (RCase _ x xs) = foo [ "Case", show x, show xs]
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show (RParseError _ str) = foo [ "ParseError", "str"]
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show (RU _) = "U"
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export
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Pretty Pattern where
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-- FIXME - wrap Implicit with {}
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pretty (PatVar _ icit nm) = text nm
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pretty (PatCon _ icit nm args) = text nm <+> spread (map pretty args)
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pretty (PatWild _icit)= "_"
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export
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Pretty Raw where
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pretty = asDoc 0
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where
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wrap : Icit -> Doc -> Doc
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wrap Explicit x = x
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wrap Implicit x = text "{" ++ x ++ text "}"
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par : Nat -> Nat -> Doc -> Doc
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par p p' d = if p' < p then text "(" ++ d ++ text ")" else d
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asDoc : Nat -> Raw -> Doc
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asDoc p (RVar _ str) = text str
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asDoc p (RLam _ str icit x) = par p 0 $ text "\\" ++ wrap icit (text str) <+> text "=>" <+> asDoc 0 x
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-- This needs precedence and operators...
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asDoc p (RApp _ x y Explicit) = par p 2 $ asDoc 2 x <+> asDoc 3 y
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asDoc p (RApp _ x y Implicit) = par p 2 $ asDoc 2 x <+> text "{" ++ asDoc 0 y ++ text "}"
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asDoc p (RU _) = text "U"
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asDoc p (RPi _ Nothing Explicit ty scope) = par p 1 $ asDoc p ty <+> text "->" <+/> asDoc p scope
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asDoc p (RPi _ (Just x) Explicit ty scope) =
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par p 1 $ text "(" <+> text x <+> text ":" <+> asDoc p ty <+> text ")" <+> text "->" <+/> asDoc p scope
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asDoc p (RPi _ nm Implicit ty scope) =
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par p 1 $ text "{" <+> text (fromMaybe "_" nm) <+> text ":" <+> asDoc p ty <+> text "}" <+> text "->" <+/> asDoc 1 scope
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asDoc p (RLet _ x v ty scope) =
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par p 0 $ text "let" <+> text x <+> text ":" <+> asDoc p ty
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<+> text "=" <+> asDoc p v
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<+/> text "in" <+> asDoc p scope
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-- does this exist?
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asDoc p (RAnn _ x y) = text "TODO - RAnn"
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asDoc p (RLit _ (LString str)) = text $ interpolate str
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asDoc p (RLit _ (LInt i)) = text $ show i
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asDoc p (RCase _ x xs) = text "TODO - RCase"
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asDoc p (RImplicit _) = text "_"
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asDoc p (RHole _) = text "?"
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asDoc p (RParseError _ str) = text "ParseError \{str}"
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export
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Pretty Module where
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pretty (MkModule name decls) =
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text "module" <+> text name </> stack (map doDecl decls)
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where
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doDecl : Decl -> Doc
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doDecl (TypeSig _ nm ty) = text nm <+> text ":" <+> nest 2 (pretty ty)
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doDecl (Def _ nm clauses) = stack $ map (\(a,b) => pretty a <+> "=" <+> pretty b) clauses
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doDecl (DImport _ nm) = text "import" <+> text nm ++ line
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-- the behavior of nest is kinda weird, I have to do the nest before/around the </>.
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doDecl (Data _ nm x xs) = text "data" <+> text nm <+> text ":" <+> pretty x <+> (nest 2 $ text "where" </> stack (map doDecl xs))
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doDecl (DCheck _ x y) = text "#check" <+> pretty x <+> ":" <+> pretty y
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doDecl (PType _ nm ty) = text "ptype" <+> text nm <+> (maybe empty (\ty => ":" <+> pretty ty) ty)
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doDecl (PFunc _ nm ty src) = "pfunc" <+> text nm <+> ":" <+> nest 2 (pretty ty <+> ":=" <+/> text (show src))
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doDecl (PMixFix _ _ _ fix) = text (show fix)
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