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Show expected input #7

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rm-hull opened this issue Jun 6, 2016 · 0 comments

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rm-hull commented Jun 6, 2016

Incorporate some notion of what the parser was expecting in the event that the input EOF was encountered. Something like how Parsec does it:

Prelude> :m +Text.Parsec
Prelude Text.Parsec> let parenSet = char '(' >> many parenSet >> char ')'
Prelude Text.Parsec> let parens = (many parenSet >> eof) <|> eof
Prelude Text.Parsec> parse parens "" "()"
Right ()
Prelude Text.Parsec> parse parens "" "()(())"
Right ()
Prelude Text.Parsec> parse parens "" "("
Left (line 1, column 2):
unexpected end of input
expecting "(" or ")"

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rm-hull added the enhancement label

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