[antlr-interest] Java Grammar

[Alan Gutierrez]

I'd like to use Antlr to create a syntax highlighter. I've taken the  
Java.g grammer offered up at the web site for Java 6 and ran it  
through org.antlr.Tool.

It produced a lot of warning messages. Is this normal? Below is the  
half-screen of warnings.

java -cp /Users/alan/.m2/repository/org/antlr/antlr-runtime/3.2/antlr- 
runtime-3.2.jar:/Users/alan/.m2/repository/antlr/antlr/2.7.7/ 
antlr-2.7.7.jar:/Users/alan/.m2/repository/org/antlr/stringtemplate/ 
3.2.1/stringtemplate-3.2.1.jar:/Users/alan/.m2/repository/org/antlr/ 
antlr/3.2/antlr-3.2.jar org.antlr.Tool Java.g
warning(209): Java.g:1767:1: Multiple token rules can match input such  
as "'-'": SUBSUB, SUB, SUBEQ

As a result, token(s) SUB,SUBEQ were disabled for that input
warning(209): Java.g:1811:1: Multiple token rules can match input such  
as "'c'": CASE, CATCH, CHAR, CLASS, CONST, CONTINUE, IDENTIFIER

As a result, token(s) CATCH,CHAR,CLASS,CONST,CONTINUE,IDENTIFIER were  
disabled for that input
warning(209): Java.g:1791:1: Multiple token rules can match input such  
as "'%'": PERCENT, PERCENTEQ

As a result, token(s) PERCENTEQ were disabled for that input
warning(209): Java.g:1811:1: Multiple token rules can match input such  
as "'t'": THIS, THROW, THROWS, TRANSIENT, TRY, TRUE, IDENTIFIER

As a result, token(s) THROW,THROWS,TRANSIENT,TRY,TRUE,IDENTIFIER were  
disabled for that input
warning(209): Java.g:1799:1: Multiple token rules can match input such  
as "'!'": BANG, BANGEQ

--
Alan Gutierrez - alan at blogometer.com - http://twitter.com/bigeasy