handling escape characters

[Trevor N]

Hi all

What is the best way to handle escape characters in a given data format I'm creating grammar for ? In this particular case, the escape character in the format is a '?', which can escape the terminal symbols of the format I'm parsing.

How can this be achieved with treetop, where the ? needs to escape the following symbol and be consumed so that it doesn't appear in the data matched ?

cheers

[Clifford Heath]

You need to create a rule to parse a sequence of semantic characters, where the semantic character can be a complete escape or an individual character. I do it here: <https://github.com/cjheath/activefacts-cql/blob/905cc2e72be55178fdbdc2820f9d7ef7a2381df9/lib/activefacts/cql/parser/LexicalRules.treetop#L102-L137>

Clifford Heath.

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