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Parser.idr
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Parser.idr
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module TTImp.Parser
import Core.Context
import Core.TT
import Parser.Source
import TTImp.TTImp
import public Libraries.Text.Parser
import Data.List
import Data.List1
topDecl : OriginDesc -> IndentInfo -> Rule ImpDecl
-- All the clauses get parsed as one-clause definitions. Collect any
-- neighbouring clauses with the same function name into one definition.
export
collectDefs : List ImpDecl -> List ImpDecl
%default covering
%hide Prelude.(>>=)
%hide Prelude.(>>)
%hide Core.Core.(>>=)
%hide Prelude.pure
%hide Core.Core.pure
%hide Lexer.Core.(<|>)
%hide Prelude.(<|>)
atom : OriginDesc -> Rule RawImp
atom fname
= do start <- location
x <- constant
end <- location
pure (IPrimVal (MkFC fname start end) x)
<|> do start <- location
str <- simpleStr
end <- location
pure (IPrimVal (MkFC fname start end) (Str str))
<|> do start <- location
exactIdent "Type"
end <- location
pure (IType (MkFC fname start end))
<|> do start <- location
symbol "_"
end <- location
pure (Implicit (MkFC fname start end) True)
<|> do start <- location
symbol "?"
end <- location
pure (Implicit (MkFC fname start end) False)
<|> do start <- location
pragma "search"
end <- location
pure (ISearch (MkFC fname start end) 1000)
<|> do start <- location
x <- name
end <- location
pure (IVar (MkFC fname start end) x)
<|> do start <- location
symbol "$"
x <- unqualifiedName
end <- location
pure (IBindVar (MkFC fname start end) x)
<|> do start <- location
x <- holeName
end <- location
pure (IHole (MkFC fname start end) x)
visOption : Rule Visibility
visOption
= do keyword "public"
keyword "export"
pure Public
<|> do keyword "export"
pure Export
<|> do keyword "private"
pure Private
visibility : EmptyRule Visibility
visibility
= visOption
<|> pure Private
totalityOpt : Rule TotalReq
totalityOpt
= do keyword "partial"
pure PartialOK
<|> do keyword "total"
pure Total
<|> do keyword "covering"
pure CoveringOnly
dataVisOpt : EmptyRule (Visibility, Maybe TotalReq)
dataVisOpt
= do { vis <- visOption ; mbtot <- optional totalityOpt ; pure (vis, mbtot) }
<|> do { tot <- totalityOpt ; vis <- visibility ; pure (vis, Just tot) }
<|> pure (Private, Nothing)
fnOpt : Rule FnOpt
fnOpt = do x <- totalityOpt
pure $ Totality x
fnDirectOpt : Rule FnOpt
fnDirectOpt
= do pragma "hint"
pure (Hint True)
<|> do pragma "chaser"
pure (Hint False)
<|> do pragma "globalhint"
pure (GlobalHint True)
<|> do pragma "defaulthint"
pure (GlobalHint False)
<|> do pragma "inline"
pure Inline
<|> do pragma "noinline"
pure NoInline
<|> do pragma "deprecate"
pure Deprecate
<|> do pragma "extern"
pure ExternFn
visOpt : Rule (Either Visibility FnOpt)
visOpt
= do vis <- visOption
pure (Left vis)
<|> do tot <- fnOpt
pure (Right tot)
<|> do opt <- fnDirectOpt
pure (Right opt)
getVisibility : Maybe Visibility -> List (Either Visibility FnOpt) ->
EmptyRule Visibility
getVisibility Nothing [] = pure Private
getVisibility (Just vis) [] = pure vis
getVisibility Nothing (Left x :: xs) = getVisibility (Just x) xs
getVisibility (Just vis) (Left x :: xs)
= fatalError "Multiple visibility modifiers"
getVisibility v (_ :: xs) = getVisibility v xs
getRight : Either a b -> Maybe b
getRight (Left _) = Nothing
getRight (Right v) = Just v
bindSymbol : Rule (PiInfo RawImp)
bindSymbol
= do symbol "->"
pure Explicit
<|> do symbol "=>"
pure AutoImplicit
mutual
appExpr : OriginDesc -> IndentInfo -> Rule RawImp
appExpr fname indents
= case_ fname indents
<|> lazy fname indents
<|> do start <- location
f <- simpleExpr fname indents
args <- many (argExpr fname indents)
end <- location
pure (applyExpImp start end f args)
where
applyExpImp : FilePos -> FilePos ->
RawImp -> List (Either RawImp (Maybe Name, RawImp)) ->
RawImp
applyExpImp start end f [] = f
applyExpImp start end f (Left exp :: args)
= applyExpImp start end (IApp (MkFC fname start end) f exp) args
applyExpImp start end f (Right (Just n, imp) :: args)
= applyExpImp start end (INamedApp (MkFC fname start end) f n imp) args
applyExpImp start end f (Right (Nothing, imp) :: args)
= applyExpImp start end (IAutoApp (MkFC fname start end) f imp) args
argExpr : OriginDesc -> IndentInfo ->
Rule (Either RawImp (Maybe Name, RawImp))
argExpr fname indents
= do continue indents
arg <- simpleExpr fname indents
pure (Left arg)
<|> do continue indents
arg <- implicitArg fname indents
pure (Right arg)
implicitArg : OriginDesc -> IndentInfo -> Rule (Maybe Name, RawImp)
implicitArg fname indents
= do start <- location
symbol "{"
x <- UN . Basic <$> unqualifiedName
(do symbol "="
commit
tm <- expr fname indents
symbol "}"
pure (Just x, tm))
<|> (do symbol "}"
end <- location
pure (Just x, IVar (MkFC fname start end) x))
<|> do symbol "@{"
commit
tm <- expr fname indents
symbol "}"
pure (Nothing, tm)
as : OriginDesc -> IndentInfo -> Rule RawImp
as fname indents
= do start <- location
x <- UN . Basic <$> unqualifiedName
nameEnd <- location
symbol "@"
pat <- simpleExpr fname indents
end <- location
pure (IAs (MkFC fname start end) (MkFC fname start nameEnd) UseRight x pat)
simpleExpr : OriginDesc -> IndentInfo -> Rule RawImp
simpleExpr fname indents
= as fname indents
<|> atom fname
<|> binder fname indents
<|> rewrite_ fname indents
<|> record_ fname indents
<|> do symbol "("
e <- expr fname indents
symbol ")"
pure e
multiplicity : EmptyRule (Maybe Integer)
multiplicity
= do c <- intLit
pure (Just c)
<|> pure Nothing
getMult : Maybe Integer -> EmptyRule RigCount
getMult (Just 0) = pure erased
getMult (Just 1) = pure linear
getMult Nothing = pure top
getMult _ = fatalError "Invalid multiplicity (must be 0 or 1)"
pibindAll : FC -> PiInfo RawImp -> List (RigCount, Maybe Name, RawImp) ->
RawImp -> RawImp
pibindAll fc p [] scope = scope
pibindAll fc p ((rig, n, ty) :: rest) scope
= IPi fc rig p n ty (pibindAll fc p rest scope)
bindList : OriginDesc -> FilePos -> IndentInfo ->
Rule (List (RigCount, Name, RawImp))
bindList fname start indents
= forget <$> sepBy1 (symbol ",")
(do rigc <- multiplicity
n <- unqualifiedName
end <- location
ty <- option
(Implicit (MkFC fname start end) False)
(do symbol ":"
appExpr fname indents)
rig <- getMult rigc
pure (rig, UN (Basic n), ty))
pibindListName : OriginDesc -> FilePos -> IndentInfo ->
Rule (List (RigCount, Name, RawImp))
pibindListName fname start indents
= do rigc <- multiplicity
ns <- sepBy1 (symbol ",") unqualifiedName
symbol ":"
ty <- expr fname indents
atEnd indents
rig <- getMult rigc
pure (map (\n => (rig, UN (Basic n), ty)) (forget ns))
<|> forget <$> sepBy1 (symbol ",")
(do rigc <- multiplicity
n <- name
symbol ":"
ty <- expr fname indents
rig <- getMult rigc
pure (rig, n, ty))
pibindList : OriginDesc -> FilePos -> IndentInfo ->
Rule (List (RigCount, Maybe Name, RawImp))
pibindList fname start indents
= do params <- pibindListName fname start indents
pure $ map (\(rig, n, ty) => (rig, Just n, ty)) params
autoImplicitPi : OriginDesc -> IndentInfo -> Rule RawImp
autoImplicitPi fname indents
= do start <- location
symbol "{"
keyword "auto"
commit
binders <- pibindList fname start indents
symbol "}"
symbol "->"
scope <- typeExpr fname indents
end <- location
pure (pibindAll (MkFC fname start end) AutoImplicit binders scope)
forall_ : OriginDesc -> IndentInfo -> Rule RawImp
forall_ fname indents
= do start <- location
keyword "forall"
commit
nstart <- location
ns <- sepBy1 (symbol ",") unqualifiedName
nend <- location
let nfc = MkFC fname nstart nend
let binders = map (\n => ( erased {a=RigCount}
, Just (UN $ Basic n)
, Implicit nfc False))
(forget ns)
symbol "."
scope <- typeExpr fname indents
end <- location
pure (pibindAll (MkFC fname start end) Implicit binders scope)
implicitPi : OriginDesc -> IndentInfo -> Rule RawImp
implicitPi fname indents
= do start <- location
symbol "{"
binders <- pibindList fname start indents
symbol "}"
symbol "->"
scope <- typeExpr fname indents
end <- location
pure (pibindAll (MkFC fname start end) Implicit binders scope)
explicitPi : OriginDesc -> IndentInfo -> Rule RawImp
explicitPi fname indents
= do start <- location
symbol "("
binders <- pibindList fname start indents
symbol ")"
exp <- bindSymbol
scope <- typeExpr fname indents
end <- location
pure (pibindAll (MkFC fname start end) exp binders scope)
lam : OriginDesc -> IndentInfo -> Rule RawImp
lam fname indents
= do start <- location
symbol "\\"
binders <- bindList fname start indents
symbol "=>"
mustContinue indents Nothing
scope <- expr fname indents
end <- location
pure (bindAll (MkFC fname start end) binders scope)
where
bindAll : FC -> List (RigCount, Name, RawImp) -> RawImp -> RawImp
bindAll fc [] scope = scope
bindAll fc ((rig, n, ty) :: rest) scope
= ILam fc rig Explicit (Just n) ty (bindAll fc rest scope)
let_ : OriginDesc -> IndentInfo -> Rule RawImp
let_ fname indents
= do start <- location
keyword "let"
rigc <- multiplicity
rig <- getMult rigc
n <- bounds name
symbol "="
commit
val <- expr fname indents
continue indents
keyword "in"
scope <- typeExpr fname indents
end <- location
pure (let fc = MkFC fname start end in
ILet fc (boundToFC fname n) rig n.val (Implicit fc False) val scope)
<|> do start <- location
keyword "let"
ds <- block (topDecl fname)
continue indents
keyword "in"
scope <- typeExpr fname indents
end <- location
pure (ILocal (MkFC fname start end) (collectDefs ds) scope)
case_ : OriginDesc -> IndentInfo -> Rule RawImp
case_ fname indents
= do start <- location
keyword "case"
scr <- expr fname indents
keyword "of"
alts <- block (caseAlt fname)
end <- location
pure (let fc = MkFC fname start end in
ICase fc scr (Implicit fc False) alts)
caseAlt : OriginDesc -> IndentInfo -> Rule ImpClause
caseAlt fname indents
= do start <- location
lhs <- appExpr fname indents
caseRHS fname indents start lhs
caseRHS : OriginDesc -> IndentInfo -> (Int, Int) -> RawImp ->
Rule ImpClause
caseRHS fname indents start lhs
= do symbol "=>"
continue indents
rhs <- expr fname indents
atEnd indents
end <- location
pure (PatClause (MkFC fname start end) lhs rhs)
<|> do keyword "impossible"
atEnd indents
end <- location
pure (ImpossibleClause (MkFC fname start end) lhs)
record_ : OriginDesc -> IndentInfo -> Rule RawImp
record_ fname indents
= do start <- location
keyword "record"
symbol "{"
commit
fs <- sepBy1 (symbol ",") (field fname indents)
symbol "}"
sc <- expr fname indents
end <- location
pure (IUpdate (MkFC fname start end) (forget fs) sc)
field : OriginDesc -> IndentInfo -> Rule IFieldUpdate
field fname indents
= do path <- sepBy1 (symbol "->") unqualifiedName
upd <- (do symbol "="; pure ISetField)
<|>
(do symbol "$="; pure ISetFieldApp)
val <- appExpr fname indents
pure (upd (forget path) val)
rewrite_ : OriginDesc -> IndentInfo -> Rule RawImp
rewrite_ fname indents
= do start <- location
keyword "rewrite"
rule <- expr fname indents
keyword "in"
tm <- expr fname indents
end <- location
pure (IRewrite (MkFC fname start end) rule tm)
lazy : OriginDesc -> IndentInfo -> Rule RawImp
lazy fname indents
= do start <- location
exactIdent "Lazy"
tm <- simpleExpr fname indents
end <- location
pure (IDelayed (MkFC fname start end) LLazy tm)
<|> do start <- location
exactIdent "Inf"
tm <- simpleExpr fname indents
end <- location
pure (IDelayed (MkFC fname start end) LInf tm)
<|> do start <- location
exactIdent "Delay"
tm <- simpleExpr fname indents
end <- location
pure (IDelay (MkFC fname start end) tm)
<|> do start <- location
exactIdent "Force"
tm <- simpleExpr fname indents
end <- location
pure (IForce (MkFC fname start end) tm)
binder : OriginDesc -> IndentInfo -> Rule RawImp
binder fname indents
= autoImplicitPi fname indents
<|> forall_ fname indents
<|> implicitPi fname indents
<|> explicitPi fname indents
<|> lam fname indents
<|> let_ fname indents
typeExpr : OriginDesc -> IndentInfo -> Rule RawImp
typeExpr fname indents
= do start <- location
arg <- appExpr fname indents
(do continue indents
rest <- some (do exp <- bindSymbol
op <- appExpr fname indents
pure (exp, op))
end <- location
pure (mkPi start end arg (forget rest)))
<|> pure arg
where
mkPi : FilePos -> FilePos -> RawImp -> List (PiInfo RawImp, RawImp) -> RawImp
mkPi start end arg [] = arg
mkPi start end arg ((exp, a) :: as)
= IPi (MkFC fname start end) top exp Nothing arg
(mkPi start end a as)
export
expr : OriginDesc -> IndentInfo -> Rule RawImp
expr = typeExpr
tyDecl : OriginDesc -> IndentInfo -> Rule ImpTy
tyDecl fname indents
= do start <- location
n <- name
nameEnd <- location
symbol ":"
ty <- expr fname indents
end <- location
atEnd indents
pure (MkImpTy (MkFC fname start end) (MkFC fname start nameEnd) n ty)
mutual
parseRHS : (withArgs : Nat) ->
OriginDesc -> IndentInfo -> (Int, Int) -> RawImp ->
Rule (Name, ImpClause)
parseRHS withArgs fname indents start lhs
= do symbol "="
commit
rhs <- expr fname indents
atEnd indents
end <- location
let fc = MkFC fname start end
pure (!(getFn lhs), PatClause fc lhs rhs)
<|> do keyword "with"
m <- multiplicity
rig <- getMult m
wstart <- location
symbol "("
wval <- expr fname indents
symbol ")"
prf <- optional (keyword "proof" *> name)
ws <- nonEmptyBlock (clause (S withArgs) fname)
end <- location
let fc = MkFC fname start end
pure (!(getFn lhs), WithClause fc lhs rig wval prf [] (forget $ map snd ws))
<|> do keyword "impossible"
atEnd indents
end <- location
let fc = MkFC fname start end
pure (!(getFn lhs), ImpossibleClause fc lhs)
where
getFn : RawImp -> EmptyRule Name
getFn (IVar _ n) = pure n
getFn (IApp _ f a) = getFn f
getFn (IAutoApp _ f a) = getFn f
getFn (INamedApp _ f _ a) = getFn f
getFn _ = fail "Not a function application"
clause : Nat -> OriginDesc -> IndentInfo -> Rule (Name, ImpClause)
clause withArgs fname indents
= do start <- location
lhs <- expr fname indents
extra <- many parseWithArg
ifThenElse (withArgs /= length extra)
(fatalError "Wrong number of 'with' arguments")
(parseRHS withArgs fname indents start (applyArgs lhs extra))
where
applyArgs : RawImp -> List (FC, RawImp) -> RawImp
applyArgs f [] = f
applyArgs f ((fc, a) :: args) = applyArgs (IApp fc f a) args
parseWithArg : Rule (FC, RawImp)
parseWithArg
= do symbol "|"
start <- location
tm <- expr fname indents
end <- location
pure (MkFC fname start end, tm)
definition : OriginDesc -> IndentInfo -> Rule ImpDecl
definition fname indents
= do start <- location
nd <- clause 0 fname indents
end <- location
pure (IDef (MkFC fname start end) (fst nd) [snd nd])
dataOpt : Rule DataOpt
dataOpt
= do exactIdent "noHints"
pure NoHints
<|> do exactIdent "uniqueSearch"
pure UniqueSearch
<|> do exactIdent "search"
ns <- forget <$> some name
pure (SearchBy ns)
dataOpts : EmptyRule (List DataOpt)
dataOpts = option [] $ do
symbol "["
dopts <- sepBy1 (symbol ",") dataOpt
symbol "]"
pure $ forget dopts
dataDecl : OriginDesc -> IndentInfo -> Rule ImpData
dataDecl fname indents
= do start <- location
keyword "data"
n <- name
symbol ":"
ty <- expr fname indents
keyword "where"
opts <- dataOpts
cs <- block (tyDecl fname)
end <- location
pure (MkImpData (MkFC fname start end) n ty opts cs)
recordParam : OriginDesc -> IndentInfo -> Rule (List (Name, RigCount, PiInfo RawImp, RawImp))
recordParam fname indents
= do symbol "("
start <- location
params <- pibindListName fname start indents
symbol ")"
pure $ map (\(c, n, tm) => (n, c, Explicit, tm)) params
<|> do symbol "{"
commit
start <- location
info <- (pure AutoImplicit <* keyword "auto"
<|>(do
keyword "default"
t <- simpleExpr fname indents
pure $ DefImplicit t)
<|> pure Implicit)
params <- pibindListName fname start indents
symbol "}"
pure $ map (\(c, n, tm) => (n, c, info, tm)) params
<|> do start <- location
n <- name
end <- location
pure [(n, top, Explicit, Implicit (MkFC fname start end) False)]
fieldDecl : OriginDesc -> IndentInfo -> Rule (List IField)
fieldDecl fname indents
= do symbol "{"
commit
fs <- fieldBody Implicit
symbol "}"
atEnd indents
pure fs
<|> do fs <- fieldBody Explicit
atEnd indents
pure fs
where
fieldBody : PiInfo RawImp -> Rule (List IField)
fieldBody p
= do start <- location
ns <- sepBy1 (symbol ",") unqualifiedName
symbol ":"
ty <- expr fname indents
end <- location
pure (map (\n => MkIField (MkFC fname start end)
linear p (UN $ Basic n) ty) (forget ns))
recordDecl : OriginDesc -> IndentInfo -> Rule ImpDecl
recordDecl fname indents
= do start <- location
(vis,mbtot) <- dataVisOpt
col <- column
keyword "record"
commit
n <- name
paramss <- many (recordParam fname indents)
let params = concat paramss
keyword "where"
opts <- dataOpts
exactIdent "constructor"
dc <- name
flds <- assert_total (blockAfter col (fieldDecl fname))
end <- location
pure (let fc = MkFC fname start end in
IRecord fc Nothing vis mbtot
(MkImpRecord fc n params opts dc (concat flds)))
namespaceDecl : Rule Namespace
namespaceDecl
= do keyword "namespace"
commit
namespaceId
logLevel : Rule (Maybe (List String, Nat))
logLevel
= (Nothing <$ exactIdent "off")
<|> do topic <- option [] ((::) <$> unqualifiedName <*> many aDotIdent)
lvl <- intLit
pure (Just (topic, fromInteger lvl))
directive : OriginDesc -> IndentInfo -> Rule ImpDecl
directive fname indents
= do pragma "logging"
commit
lvl <- logLevel
atEnd indents
pure (ILog lvl)
<|> do b <- bounds (do pragma "builtin"
commit
t <- builtinType
n <- name
pure (t, n))
(t, n) <- pure b.val
pure $ IBuiltin (boundToFC fname b) t n
{- Can't do IPragma due to lack of Ref Ctxt. Should we worry about this?
<|> do pragma "pair"
commit
start <- location
p <- name
f <- name
s <- name
end <- location
pure (let fc = MkFC fname start end in
IPragma (\nest, env => setPair {c} fc p f s))
<|> do pragma "rewrite"
commit
start <- location
eq <- name
rw <- name
end <- location
pure (let fc = MkFC fname start end in
IPragma (\c, nest, env => setRewrite {c} fc eq rw))
-}
-- Declared at the top
-- topDecl : OriginDesc -> IndentInfo -> Rule ImpDecl
topDecl fname indents
= do start <- location
(vis,mbtot) <- dataVisOpt
dat <- dataDecl fname indents
end <- location
pure (IData (MkFC fname start end) vis mbtot dat)
<|> do start <- location
ns <- namespaceDecl
ds <- assert_total (nonEmptyBlock (topDecl fname))
end <- location
pure (INamespace (MkFC fname start end) ns (forget ds))
<|> do start <- location
visOpts <- many visOpt
vis <- getVisibility Nothing visOpts
let opts = mapMaybe getRight visOpts
m <- multiplicity
rig <- getMult m
claim <- tyDecl fname indents
end <- location
pure (IClaim (MkFC fname start end) rig vis opts claim)
<|> recordDecl fname indents
<|> directive fname indents
<|> definition fname indents
-- Declared at the top
-- collectDefs : List ImpDecl -> List ImpDecl
collectDefs [] = []
collectDefs (IDef loc fn cs :: ds)
= let (cs', rest) = spanMap (isClause fn) ds in
IDef loc fn (cs ++ cs') :: assert_total (collectDefs rest)
where
spanMap : (a -> Maybe (List b)) -> List a -> (List b, List a)
spanMap f [] = ([], [])
spanMap f (x :: xs) = case f x of
Nothing => ([], x :: xs)
Just y => case spanMap f xs of
(ys, zs) => (y ++ ys, zs)
isClause : Name -> ImpDecl -> Maybe (List ImpClause)
isClause n (IDef _ n' cs)
= if n == n' then Just cs else Nothing
isClause n _ = Nothing
collectDefs (INamespace loc ns nds :: ds)
= INamespace loc ns (collectDefs nds) :: collectDefs ds
collectDefs (IFail loc msg nds :: ds)
= IFail loc msg (collectDefs nds) :: collectDefs ds
collectDefs (d :: ds)
= d :: collectDefs ds
-- full programs
export
prog : OriginDesc -> Rule (List ImpDecl)
prog fname
= do ds <- nonEmptyBlock (topDecl fname)
pure (collectDefs $ forget ds)
-- TTImp REPL commands
export
command : Rule ImpREPL
command
= do symbol ":"; exactIdent "t"
tm <- expr (Virtual Interactive) init
pure (Check tm)
<|> do symbol ":"; exactIdent "s"
n <- name
pure (ProofSearch n)
<|> do symbol ":"; exactIdent "es"
n <- name
pure (ExprSearch n)
<|> do symbol ":"; exactIdent "gd"
l <- intLit
n <- name
pure (GenerateDef (fromInteger l) n)
<|> do symbol ":"; exactIdent "missing"
n <- name
pure (Missing n)
<|> do symbol ":"; keyword "total"
n <- name
pure (CheckTotal n)
<|> do symbol ":"; exactIdent "di"
n <- name
pure (DebugInfo n)
<|> do symbol ":"; exactIdent "q"
pure Quit
<|> do tm <- expr (Virtual Interactive) init
pure (Eval tm)