[antlr-interest] more lexical determinism
howardckatz
howardk at fatdog.com
Wed Dec 5 12:26:55 PST 2001
I can see why I'm getting a lexical nondeterminism error in the
following, since the lexer has no way of knowing whether "ABCDE" for
example is a Word or an Identifier, but I can't see how to resolve
the amibiguity, using a predicate or otherwise. What's the easiest
way to do this?
Thanks,
Howard
class TestParser extends Parser;
message: (pair)+;
pair: Identifier COLON Word;
class TestLexer extends Lexer;
Identifier: ( Letter | '_' ) (Letter | Digit)*;
Word: (Letter)*;
protected
Letter: 'a' .. 'z' | 'A' .. 'Z';
protected
Digit: '0' .. '9';
COLON: ':';
WS : ( ' ' | '\t' | "\r\n" | '\n' | '\r' )
{ $setType(Token.SKIP); };
Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
More information about the antlr-interest
mailing list