[antlr-interest] Lexer for comments

[Uli Bubenheimer]

The documentation for ANTLR gives a variant of the following as an
example for parsing C-style multi-line comments:

class L extends Lexer;
options {k = 2;}
Comment : "/*" ( options { greedy = false; } : . )* "*/" ;


I have a specification for a lexer where everything except the
multi-line comment can be parsed with k == 1 lookahead. I assume that
setting k = 2 will slow down parsing for the rest of my grammar. So I
was wondering whether the following might work. Parsing comments may
be a bit slower now, but I'm thinking as long as there are few
comments in my source I would be faster overall, due to k == 1.

class ADLLexer extends Lexer;
options {k = 1;}
Comment : "/*" ( ( '*' ~'/') => '*' | ~'*' )* "*/" ;


Are there other alternatives?

Uli





 
Yahoo! Groups Links

<*> To visit your group on the web, go to:
     http://groups.yahoo.com/group/antlr-interest/

<*> To unsubscribe from this group, send an email to:
     antlr-interest-unsubscribe at yahoogroups.com

<*> Your use of Yahoo! Groups is subject to:
     http://docs.yahoo.com/info/terms/