Re: a tool for partial parsing?

(briank@leland.Stanford.EDU (Brian E Korver))


| I'd like a version of (something like) yacc that will return and allow
| reentrance mid-parse. In other words, instead of having the parser
| drive the whole program, I want a front end to drive the parser.


Table-driven parsers, like those generated by yacc, naturally lend
themselves to running in a push-fed manner. If you look at the code
generated for yy_parse(), you'll find it relatively easy to rewrite in the
form yyparse(int token). We had to do this here for unmentionable reasons.


Further, the code generated for yy_parse() is always the same except, of
course, for the big switch statement that handles the actions. Depending
on your implementation of yacc, you should find this code stored simply as
a bunch of strings in the yacc source, which you can replace with your new
version.


</Matt>


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