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grammar Backtracking;
options {
// antlr will generate java lexer and parser
language = Java;
// generated parser should create abstract syntax tree
output = AST;
// parser will extend special super class
superClass = SuperParser;
@parser::header {
package org.meri.antlr.predicates;
@parser::members {
@lexer::header {
package org.meri.antlr.predicates;
LETTER : 'a'..'z' | 'A'..'Z';
word: LETTER {1+2==3}? LETTER;
number: LETTER {2+3!=5}? LETTER;
backtrack: (number)=> number | word;
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