[Haskell-cafe] Return user state in Parsec
maciej.podgurski at googlemail.com
Wed May 21 12:43:59 EDT 2008
I'm currently writing a parser using the Parsec library. What I want is
to store the order of each subparser called in a user state. So every
single parser will be marked with a label that is stored in a special
treelike structure when the parser is run.
My problem is to return the last state of this structure when a parse
error occurred. This information shall be used to display a kind of
stack trace showing the order of the parser calls for debug purposes.
Any ideas how to achieve this?
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