[antlr-interest] The unary not (~) vs. W3C EBNF dash operator
Andreas Ravnestad
andreas.ravnestad at gmail.com
Mon Oct 8 07:51:18 PDT 2007
The W3C uses an operator in their EBNFs designated by a dash (-), and
it is defined as follows (see [1]): A - B matches any string that
matches A but does not match B.
For now, I have simply replaced the dashes with tilde in the ANTLR
grammar, however this is not semantically correct. Is there a
semantically equivalent operator in ANTLR, or is it necessary to
rewrite grammar rules that uses the dash operator?
- Andreas Ravnestad
[1] http://www.w3.org/TR/REC-xml/#sec-notation
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