Thread Safe Lexer and Parser?

This is what I want to do:
  Instantiate, when needed, any number of indepenendent scanners, each with
  its own associated parser. Each scanner and parser would have its own
  tables and state variables.


  I don't want to do this by editing source
  code and creating object files, since I don't know how many input streams
  I'll need to scan at any one time. I need to do this on the fly, during
  execution.


? Is there a maintainable way to alter the scanner and parser generated by
lex and yacc, to accomplish my goal?


or


? Are there thread-safe versions of lex and yacc available?


or


? Are there thread safe scanner and parser generators other than lex and
yacc available?


I didn't see any such in the catalog.


--
Aaron, just Aaron http://www.acm.org/~AARON/homepage.html |
______________________________________________ | personal: aaron@acm.org |
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