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semantic/src/Renderer/SExpression.hs

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{-# LANGUAGE GADTs, RankNTypes, ScopedTypeVariables #-}
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module Renderer.SExpression
( renderSExpressionDiff
, renderSExpressionTerm
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) where
import Data.Bifunctor.Join
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import Data.ByteString.Char8 hiding (intersperse, foldr, spanEnd)
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import Data.Foldable (fold)
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import Data.Functor.Foldable (cata)
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import Data.List (intersperse)
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import Data.Record
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import Data.Semigroup
import Diff
import Patch
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import Prelude hiding (replicate)
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import Term
-- | Returns a ByteString SExpression formatted diff.
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renderSExpressionDiff :: (ConstrainAll Show fields, Foldable f, Functor f) => Diff f (Record fields) -> ByteString
renderSExpressionDiff diff = cata printDiffF diff 0 <> "\n"
-- | Returns a ByteString SExpression formatted term.
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renderSExpressionTerm :: (ConstrainAll Show fields, Foldable f, Functor f) => Term f (Record fields) -> ByteString
renderSExpressionTerm term = cata (\ term level -> pad level <> printTermF term level) term 0 <> "\n"
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printDiffF :: (ConstrainAll Show fields, Foldable f, Functor f) => DiffF f (Record fields) (Int -> ByteString) -> Int -> ByteString
printDiffF diff level = case diff of
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Patch patch -> case patch of
Insert term -> pad (level - 1) <> "{+" <> printTermF term level <> "+}"
Delete term -> pad (level - 1) <> "{-" <> printTermF term level <> "-}"
Replace a b -> pad (level - 1) <> "{ " <> printTermF a level <> pad (level - 1) <> "->" <> printTermF b level <> " }"
Copy vs (Join (_, annotation)) syntax -> pad level <> "(" <> showBindings (fmap (\ b -> b level) <$> vs) <> showAnnotation annotation <> foldMap (\ d -> d (level + 1)) syntax <> ")"
Var v -> pad level <> showMetaVar v
printTermF :: (ConstrainAll Show fields, Foldable f, Functor f) => TermF f (Record fields) (Int -> ByteString) -> Int -> ByteString
printTermF (annotation :< syntax) level = "(" <> showAnnotation annotation <> foldMap (\t -> t (level + 1)) syntax <> ")"
pad :: Int -> ByteString
pad n | n <= 0 = ""
| otherwise = "\n" <> replicate (2 * n) ' '
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showAnnotation :: ConstrainAll Show fields => Record fields -> ByteString
showAnnotation Nil = ""
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showAnnotation (only :. Nil) = pack (show only)
showAnnotation (first :. rest) = pack (show first) <> " " <> showAnnotation rest
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showBindings :: [(MetaVar, ByteString)] -> ByteString
showBindings [] = ""
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showBindings bindings = "[ " <> fold (intersperse "\n, " (showBinding <$> bindings)) <> " ]"
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where showBinding (var, val) = showMetaVar var <> "/" <> val
showMetaVar :: MetaVar -> ByteString
showMetaVar (MetaVar s) = pack ('$' : s)