TPG error when using 't' as the first letter of a token
drew at gremlinhosting.com
Thu Nov 18 23:43:17 CET 2004
Thanks for your detailed response. I've read through the PyParsing site
and I'm considering using it for further development of my project -
wish I'd found it before!
I noted your comments about my last test case; the syntax of the
language I'm implementing is closely related to XPath and the  at the
end of the query are intended to contain metadata criteria. I have since
revised my parsing rules (see below) and they now parse both the
original test queries and arbitrarily complex boolean expressions.
I'm just about to post a new message with a description of what the
language is aimed at doing and asking for any improvements - I would
value your opinion if you have the time.
separator space '\s+';
token Num '\d+(.\d+)?';
token Ident '[a-zA-Z]\w*';
token CharList '\'.*\'';
token CatUnOp '~';
token CatOp '[/\^]';
token MetaOp '[=\+\-!]';
token Date '\d\d-\d\d-\d\d\d\d';
token FileID '(\w+\.\w+)';
token EmptyLine '^$';
START -> CatExpr ('\[' MetaExpr '\]')?
CatExpr -> CatUnOp CatName
| CatName (CatOp CatExpr)*
CatName -> Ident
| '\(' CatExpr '\)'
MetaExpr -> MetaCrit (',' MetaCrit)*
MetaCrit -> Ident MetaOp Value
Value -> CharList | Num | Date
parseTests = (
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