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grammar s; @lexer::members { public class MyToken extends CommonToken { int x; // custom field public MyToken(CharStream input, int type, int channel, int start, int stop) { super(input, type, channel, start, stop); x = 0; } public String toString() { return super.toString()+",x="+x; } } // override standard token emission public Token emit() { MyToken t = new MyToken(input, state.type, state.channel, state.tokenStartCharIndex, getCharIndex()-1); t.setLine(state.tokenStartLine); t.setText(state.text); t.setCharPositionInLine(state.tokenStartCharPositionInLine); t.x = 1; emit(t); return t; } } a : 'int' ID (',' ID)* ';' ; ID : 'a'..'z'+ ;INT : '0'..'9'+; WS : (' '|'\n') {$channel=HIDDEN;} ; |
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$ java org.antlr.Tool s.g
ANTLR Parser Generator Version 3.0 1989-2007
$ javac Test.java
$ cat input
int a,b;
$ java Test input
Tokens:
[@0,0:2='int',<7>,1:0],x=1
[@2,4:4='a',<4>,1:4],x=1
[@4,6:6='b',<4>,1:6],x=1
[@6,8:8='\n',<6>,channel=99,1:8],x=1
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