quox/lib/Quox/Syntax/Term/Pretty.idr

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module Quox.Syntax.Term.Pretty
import Quox.Syntax.Term.Base
import Quox.Syntax.Term.Split
import Quox.Syntax.Term.Subst
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import Quox.Context
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import Quox.Pretty
import Data.Vect
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%default total
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export %inline
typeD, arrowD, darrowD, timesD, lamD, eqndD, dlamD, annD, natD :
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Pretty.HasEnv m => m (Doc HL)
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typeD = hlF Syntax $ ifUnicode "" "Type"
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arrowD = hlF Syntax $ ifUnicode "" "->"
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darrowD = hlF Syntax $ ifUnicode "" "=>"
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timesD = hlF Syntax $ ifUnicode "×" "**"
lamD = hlF Syntax $ ifUnicode "λ" "fun"
eqndD = hlF Syntax $ ifUnicode "" "=="
dlamD = hlF Syntax $ ifUnicode "δ" "dfun"
annD = hlF Syntax $ ifUnicode "" "::"
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natD = hlF Syntax $ ifUnicode "" "Nat"
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export %inline
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eqD, colonD, commaD, semiD, caseD, returnD, ofD, dotD, zeroD, succD : Doc HL
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eqD = hl Syntax "Eq"
colonD = hl Syntax ":"
commaD = hl Syntax ","
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semiD = hl Syntax ";"
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caseD = hl Syntax "case"
ofD = hl Syntax "of"
returnD = hl Syntax "return"
dotD = hl Delim "."
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zeroD = hl Syntax "zero"
succD = hl Syntax "succ"
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export
prettyUnivSuffix : Pretty.HasEnv m => Universe -> m (Doc HL)
prettyUnivSuffix l =
ifUnicode (pretty $ pack $ map sub $ unpack $ show l) (pretty l)
where
sub : Char -> Char
sub c = case c of
'0' => ''; '1' => ''; '2' => ''; '3' => ''; '4' => ''
'5' => ''; '6' => ''; '7' => ''; '8' => ''; '9' => ''; _ => c
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export
prettyUniverse : Universe -> Doc HL
prettyUniverse = hl Syntax . pretty
public export
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data WithQty a = MkWithQty Qty a
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export
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PrettyHL a => PrettyHL (WithQty a) where
prettyM (MkWithQty q x) = do
q <- pretty0M q
x <- withPrec Arg $ prettyM x
pure $ hcat [q, dotD, x]
public export
data Binder a = MkBinder BaseName a
export
PrettyHL a => PrettyHL (Binder a) where
prettyM (MkBinder x ty) = do
x <- pretty0M $ TV x
ty <- align <$> pretty0M ty
pure $ parens $ sep [hsep [x, colonD], ty]
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export
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prettyBindType : PrettyHL a => PrettyHL b =>
Pretty.HasEnv m =>
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Maybe Qty -> BaseName -> a -> Doc HL -> b -> m (Doc HL)
prettyBindType q x s arr t = do
bind <- case q of
Nothing => pretty0M $ MkBinder x s
Just q => pretty0M $ MkWithQty q $ MkBinder x s
t <- withPrec AnnR $ under T x $ prettyM t
parensIfM AnnR $ hang 2 $ bind <++> arr <%%> t
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export
prettyArm : PrettyHL a => Pretty.HasEnv m =>
BinderSort -> SnocList BaseName -> Doc HL -> a -> m (Doc HL)
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prettyArm sort xs pat body = do
body <- withPrec Outer $ unders sort xs $ prettyM body
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pure $ hang 2 $ sep [pat <++> !darrowD, body]
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export
prettyLams : PrettyHL a => Pretty.HasEnv m =>
Maybe (Doc HL) -> BinderSort -> SnocList BaseName -> a ->
m (Doc HL)
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prettyLams lam sort names body = do
let var = case sort of T => TVar; D => DVar
header <- sequence $ [hlF var $ prettyM x | x <- toList names]
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let header = sep $ maybe header (:: header) lam
parensIfM Outer =<< prettyArm sort names header body
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export
prettyApps : PrettyHL f => PrettyHL a => Pretty.HasEnv m =>
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Maybe (Doc HL) -> f -> List a -> m (Doc HL)
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prettyApps pfx fun args = do
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fun <- withPrec App $ prettyM fun
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args <- traverse (withPrec Arg . prettyArg) args
parensIfM App $ hang 2 $ sep $ fun :: args
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where
prettyArg : a -> m (Doc HL)
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prettyArg = case pfx of
Nothing => prettyM
Just pfx => \x => pure $ hl Delim pfx <+> !(prettyM x)
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export
prettyTuple : PrettyHL a => Pretty.HasEnv m => List a -> m (Doc HL)
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prettyTuple = map (parens . align . separate commaD) . traverse prettyM
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export
prettyArms : PrettyHL a => Pretty.HasEnv m =>
List (SnocList BaseName, Doc HL, a) -> m (Doc HL)
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prettyArms =
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map (braces . aseparate semiD) .
traverse (\(xs, l, r) => prettyArm T xs l r)
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export
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prettyCase : (PrettyHL a, PrettyHL b, PrettyHL c, Pretty.HasEnv m) =>
Qty -> a -> BaseName -> b ->
List (SnocList BaseName, Doc HL, c) ->
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m (Doc HL)
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prettyCase pi elim r ret arms = do
caseq <- (caseD <+>) <$> prettySuffix pi
elim <- pretty0M elim
ret <- prettyLams Nothing T [< r] ret
arms <- prettyArms arms
pure $ asep [caseq <++> elim, returnD <++> ret, ofD <++> arms]
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export
escapeString : String -> String
escapeString = concatMap esc1 . unpack where
esc1 : Char -> String
esc1 '"' = #"\""#
esc1 '\\' = #"\\"#
esc1 '\n' = #"\n"#
esc1 c = singleton c
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export
quoteTag : TagVal -> Doc HL
quoteTag tag =
if isName tag then fromString tag else
hcat ["\"", fromString $ escapeString tag, "\""]
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export
prettyTag : TagVal -> Doc HL
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prettyTag t = hl Tag $ "'" <+> quoteTag t
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export
prettyTagBare : TagVal -> Doc HL
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prettyTagBare t = hl Tag $ quoteTag t
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export
prettyBoxVal : PrettyHL a => Pretty.HasEnv m => a -> m (Doc HL)
prettyBoxVal val = bracks <$> pretty0M val
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export
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toNatLit : Term d n -> Maybe Nat
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toNatLit Zero = Just 0
toNatLit (Succ n) = [|S $ toNatLit n|]
toNatLit _ = Nothing
private
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eterm : Term d n -> Exists (Term d)
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eterm = Evidence n
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parameters (showSubsts : Bool)
mutual
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export covering
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[TermSubst] PrettyHL (Term d n) using ElimSubst
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where
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prettyM (TYPE l) =
parensIfM App $ !typeD <+> hl Syntax !(prettyUnivSuffix l)
prettyM (Pi qty s (S _ (N t))) = do
dom <- pretty0M $ MkWithQty qty s
cod <- withPrec AnnR $ prettyM t
parensIfM AnnR $ asep [dom <++> !arrowD, cod]
prettyM (Pi qty s (S [< x] (Y t))) =
prettyBindType (Just qty) x s !arrowD t
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prettyM (Lam (S x t)) =
let GotLams {names, body, _} = getLams' x t.term Refl in
prettyLams (Just !lamD) T (toSnocList' names) body
prettyM (Sig s (S _ (N t))) = do
s <- withPrec InTimes $ prettyM s
t <- withPrec Times $ prettyM t
parensIfM Times $ asep [s <++> !timesD, t]
prettyM (Sig s (S [< x] (Y t))) =
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prettyBindType Nothing x s !timesD t
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prettyM (Pair s t) =
let GotPairs {init, last, _} = getPairs' [< s] t in
prettyTuple $ toList $ init :< last
prettyM (Enum tags) =
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pure $ delims "{" "}" . aseparate comma $ map prettyTagBare $
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Prelude.toList tags
prettyM (Tag t) =
pure $ prettyTag t
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prettyM (Eq (S _ (N ty)) l r) = do
l <- withPrec InEq $ prettyM l
r <- withPrec InEq $ prettyM r
ty <- withPrec InEq $ prettyM ty
parensIfM Eq $ asep [l <++> !eqndD, r <++> colonD, ty]
prettyM (Eq (S [< i] (Y ty)) l r) = do
ty <- bracks <$> withPrec Outer (prettyLams Nothing D [< i] ty)
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l <- withPrec Arg $ prettyM l
r <- withPrec Arg $ prettyM r
parensIfM App $ eqD <++> asep [ty, l, r]
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prettyM (DLam (S i t)) =
let GotDLams {names, body, _} = getDLams' i t.term Refl in
prettyLams (Just !dlamD) D (toSnocList' names) body
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prettyM Nat = natD
prettyM Zero = pure $ hl Syntax "0"
prettyM (Succ n) =
case toNatLit n of
Just n => pure $ hl Syntax $ pretty $ S n
Nothing => do
n <- withPrec Arg $ prettyM n
parensIfM App $ succD <++> n
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prettyM (BOX pi ty) = do
pi <- pretty0M pi
ty <- pretty0M ty
pure $ bracks $ hcat [pi, dotD, align ty]
prettyM (Box val) = prettyBoxVal val
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prettyM (E e) = prettyM e
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prettyM (CloT s th) =
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if showSubsts then
parensIfM SApp . hang 2 =<<
[|withPrec SApp (prettyM s) <%> prettyTSubst th|]
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else
prettyM $ pushSubstsWith' id th s
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prettyM (DCloT s th) =
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if showSubsts then
parensIfM SApp . hang 2 =<<
[|withPrec SApp (prettyM s) <%> prettyDSubst th|]
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else
prettyM $ pushSubstsWith' th id s
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export covering
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[ElimSubst] PrettyHL (Elim d n) using TermSubst
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where
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prettyM (F x) =
hl' Free <$> prettyM x
prettyM (B i) =
prettyVar TVar TVarErr (!ask).tnames i
prettyM (e :@ s) =
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let GotArgs {fun, args, _} = getArgs' e [s] in
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prettyApps Nothing fun args
prettyM (CasePair pi p (S [< r] ret) (S [< x, y] body)) = do
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pat <- parens . separate commaD <$> traverse (hlF TVar . prettyM) [x, y]
prettyCase pi p r ret.term [([< x, y], pat, body.term)]
prettyM (CaseEnum pi t (S [< r] ret) arms) =
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prettyCase pi t r ret.term
[([<], prettyTag t, b) | (t, b) <- SortedMap.toList arms]
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prettyM (CaseNat pi pi' nat (S [< r] ret) zer (S [< s, ih] suc)) =
prettyCase pi nat r ret.term
[([<], zeroD, eterm zer),
([< s, ih], !succPat, eterm suc.term)]
where
succPat : m (Doc HL)
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succPat = case ih of
Unused => pure $ hsep [succD, !(pretty0M s)]
_ => pure $ sep [hsep [succD, !(pretty0M s)] <+> comma,
!(pretty0M $ MkWithQty pi' ih)]
prettyM (CaseBox pi box (S [< r] ret) (S [< u] body)) =
prettyCase pi box r ret.term
[([< u], !(prettyBoxVal $ TV u), body.term)]
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prettyM (e :% d) =
let GotDArgs {fun, args, _} = getDArgs' e [d] in
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prettyApps (Just "@") fun args
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prettyM (s :# a) = do
s <- withPrec AnnL $ prettyM s
a <- withPrec AnnR $ prettyM a
parensIfM AnnR $ hang 2 $ s <++> !annD <%%> a
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prettyM (CloE e th) =
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if showSubsts then
parensIfM SApp . hang 2 =<<
[|withPrec SApp (prettyM e) <%> prettyTSubst th|]
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else
prettyM $ pushSubstsWith' id th e
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prettyM (DCloE e th) =
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if showSubsts then
parensIfM SApp . hang 2 =<<
[|withPrec SApp (prettyM e) <%> prettyDSubst th|]
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else
prettyM $ pushSubstsWith' th id e
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export covering
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prettyTSubst : Pretty.HasEnv m => TSubst d from to -> m (Doc HL)
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prettyTSubst s =
prettySubstM (prettyM @{ElimSubst}) (!ask).tnames TVar "[" "]" s
export covering %inline
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PrettyHL (Term d n) where prettyM = prettyM @{TermSubst False}
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export covering %inline
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PrettyHL (Elim d n) where prettyM = prettyM @{ElimSubst False}
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export covering
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prettyTerm : (unicode : Bool) ->
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(dnames : NContext d) -> (tnames : NContext n) ->
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Term d n -> Doc HL
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prettyTerm unicode dnames tnames term =
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pretty0With unicode (toSnocList' dnames) (toSnocList' tnames) term