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Add a leaf combinator.

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Rob Rix 2017-04-26 12:31:00 -04:00
parent c2df871607
commit 129d962041
1 changed files with 3 additions and 0 deletions
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src/Language/Ruby/Syntax.hs
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@ -105,6 +105,9 @@ literal = term <*> (Literal.true <$ symbol Language.Ruby.Syntax.True <* source
term :: InUnion Syntax' f => Assignment (Node grammar) (f (Term Syntax Location) -> Term Syntax Location)
term = (\ a f -> cofree $ a :< inj f) <$> location
leaf :: (Enum symbol, Eq symbol, InUnion Syntax' f) => (ByteString -> f (Term Syntax Location)) -> symbol -> Assignment (Node symbol) (Term Syntax Location)
leaf f s = symbol s *> pure (\ a -> cofree . (a :<) . inj . f) <*> location <*> source
optional :: Assignment (Node Grammar) (Term Syntax Location) -> Assignment (Node Grammar) (Term Syntax Location)
optional a = a <|> term <*> pure Syntax.Empty