[Haskell-cafe] Optional EOF in Parsec.
kannan at cakoose.com
Fri Apr 3 21:17:08 EDT 2009
I'm writing a parser with Parsec. In the input language, elements of a sequence
are separated by commas:
[1, 2, 3]
However, instead of a comma, you can also use an EOL:
Anywhere else, EOL is considered ignorable whitespace. So it's not as simple as
just making EOL a token and looking for (comma | eol).
I've implemented this functionality in a hand-written parser (basically a hack
that keeps track of whether the last read token was preceded by an EOL,
without making EOL itself a token). Does anybody have ideas about how to
do this with Parsec?
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