quox/src/Quox/Pretty.idr

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module Quox.Pretty
import Quox.Name
import public Text.PrettyPrint.Prettyprinter.Doc
import Text.PrettyPrint.Prettyprinter.Render.String
import Text.PrettyPrint.Prettyprinter.Render.Terminal
import public Data.String
import Data.DPair
import public Control.Monad.Identity
import public Control.Monad.Reader
%default total
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public export
record PrettyOpts where
constructor MakePrettyOpts
unicode, color : Bool
public export
defPrettyOpts : PrettyOpts
defPrettyOpts = MakePrettyOpts {unicode = True, color = True}
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public export
data HL
= Delim
| TVar
| TVarErr
| Dim
| DVar
| DVarErr
| Qty
| Free
| Syntax
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private HLRepr : Type
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HLRepr = Nat
private %inline hlRepr : HL -> Nat
hlRepr Delim = 0
hlRepr TVar = 1
hlRepr TVarErr = 2
hlRepr Dim = 3
hlRepr DVar = 4
hlRepr DVarErr = 5
hlRepr Qty = 6
hlRepr Free = 7
hlRepr Syntax = 8
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export %inline Eq HL where (==) = (==) `on` hlRepr
export %inline Ord HL where compare = compare `on` hlRepr
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public export
data PPrec
= Outer
| Ann -- right of "::"
| AnnL -- left of "::"
-- ...
| App -- term/dimension application
| SApp -- substitution application
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| Arg -- argument to nonfix function
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private PrecRepr : Type
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PrecRepr = Nat
private %inline precRepr : PPrec -> PrecRepr
precRepr Outer = 0
precRepr Ann = 1
precRepr AnnL = 2
-- ...
precRepr App = 98
precRepr SApp = 99
precRepr Arg = 100
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export %inline Eq PPrec where (==) = (==) `on` precRepr
export %inline Ord PPrec where compare = compare `on` precRepr
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export %inline
hl : HL -> Doc HL -> Doc HL
hl = annotate
export %inline
hl' : HL -> Doc HL -> Doc HL
hl' h = hl h . unAnnotate
export %inline
hlF : Functor f => HL -> f (Doc HL) -> f (Doc HL)
hlF = map . hl
export %inline
hlF' : Functor f => HL -> f (Doc HL) -> f (Doc HL)
hlF' = map . hl'
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export %inline
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parens : Doc HL -> Doc HL
parens doc = hl Delim "(" <+> doc <+> hl Delim ")"
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export %inline
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parensIf : Bool -> Doc HL -> Doc HL
parensIf True = parens
parensIf False = id
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export
separate' : Doc a -> List (Doc a) -> List (Doc a)
separate' s [] = []
separate' s [x] = [x]
separate' s (x :: xs) = x <+> s :: separate' s xs
export %inline
separate : Doc a -> List (Doc a) -> Doc a
separate s = sep . separate' s
export %inline
hseparate : Doc a -> List (Doc a) -> Doc a
hseparate s = hsep . separate' s
export %inline
vseparate : Doc a -> List (Doc a) -> Doc a
vseparate s = vsep . separate' s
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public export
record PrettyEnv where
constructor MakePrettyEnv
||| names of bound dimension variables
dnames : List Name
||| names of bound term variables
tnames : List Name
||| use non-ascii characters for syntax
unicode : Bool
||| surrounding precedence level
prec : PPrec
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public export HasEnv : (Type -> Type) -> Type
HasEnv = MonadReader PrettyEnv
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export %inline
ifUnicode : HasEnv m => (uni, asc : Lazy a) -> m a
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ifUnicode uni asc = if (!ask).unicode then [|uni|] else [|asc|]
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export %inline
parensIfM : HasEnv m => PPrec -> Doc HL -> m (Doc HL)
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parensIfM d doc = pure $ parensIf ((!ask).prec > d) doc
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export %inline
withPrec : HasEnv m => PPrec -> m a -> m a
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withPrec d = local {prec := d}
public export data BinderSort = T | D
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export %inline
under : HasEnv m => BinderSort -> Name -> m a -> m a
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under T x = local {prec := Outer, tnames $= (x ::)}
under D x = local {prec := Outer, dnames $= (x ::)}
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public export
interface PrettyHL a where
prettyM : HasEnv m => a -> m (Doc HL)
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export %inline
pretty0M : (PrettyHL a, HasEnv m) => a -> m (Doc HL)
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pretty0M = local {prec := Outer} . prettyM
export %inline
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pretty0 : PrettyHL a => (unicode : Bool) -> a -> Doc HL
pretty0 unicode x =
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let env = MakePrettyEnv {dnames = [], tnames = [], unicode, prec = Outer} in
runReader env $ prettyM x
export
(forall a. PrettyHL (f a)) => PrettyHL (Exists f) where
prettyM x = prettyM x.snd
export
PrettyHL a => PrettyHL (Subset a b) where
prettyM x = prettyM x.fst
export PrettyHL BaseName where prettyM = pure . pretty . baseStr
export PrettyHL Name where prettyM = pure . pretty . toDots
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export %inline
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prettyStr : PrettyHL a => (unicode : Bool) -> a -> String
prettyStr unicode =
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let layout = layoutSmart (MkLayoutOptions (AvailablePerLine 80 0.8)) in
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renderString . layout . pretty0 unicode
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export
termHL : HL -> AnsiStyle
termHL Delim = color BrightBlack
termHL TVar = color BrightYellow
termHL TVarErr = color BrightYellow <+> underline
termHL Dim = color BrightGreen <+> bold
termHL DVar = color BrightGreen
termHL DVarErr = color BrightGreen <+> underline
termHL Qty = color BrightMagenta <+> bold
termHL Free = color BrightWhite
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termHL Syntax = color BrightCyan
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export %inline
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prettyTerm : PrettyOpts -> PrettyHL a => a -> IO Unit
prettyTerm opts x =
let reann = if opts.color then map termHL else unAnnotate in
Terminal.putDoc $ reann $ pretty0 opts.unicode x
export %inline
prettyTermDef : PrettyHL a => a -> IO Unit
prettyTermDef = prettyTerm defPrettyOpts
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infixr 6 <//>
export %inline
(<//>) : Doc a -> Doc a -> Doc a
a <//> b = sep [a, b]
infixr 6 </>
export %inline
(</>) : Doc a -> Doc a -> Doc a
a </> b = cat [a, b]