[antlr-interest] Why (or why not) reuse parsers and lexers?

[Chris Lambrou]

Hi all,

Is there any reason why I should consider recycling lexers and parsers in
preference to creating new instances on demand?

For example, should I consider doing this:

    existingLexer.Reser();
    existingLexer.CharStream = charStream;

instead of this:

    new MyGrammarLexer(charStream);


And should I do this:

    existingParser.Reset();
    existingParser.TokenStream = tokenStream

instead of this:

    new MyGrammarParser(tokenStream)


Are parsers and lexers especially heavyweight at all?  If the answer depends
on the context, then I should point out that I'm using the C# runtime, and
parsing many different input strings.


Thanks,

Chris
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://www.antlr.org/pipermail/antlr-interest/attachments/20090205/5e34c8a0/attachment.html