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The ANTLR 4 grammar compiler.

There is a newer version: 4.13.1.5

/*
 * Copyright (c) 2012 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD-3-Clause license that
 * can be found in the LICENSE.txt file in the project root.
 */

/** How to generate rules derived from left-recursive rules.
 *  These rely on recRuleAltPredicate(),
 *  recRuleArg(), recRuleSetResultAction(), recRuleSetReturnAction()
 *  templates in main language.stg
 */
group LeftRecursiveRules;

recRule(ruleName, argName, primaryAlts, opAlts, setResultAction,
        userRetvals, leftRecursiveRuleRefLabels) ::=
<<
 returns []
    :   ( {}  }; separator="\n        | ">
        )
        (
          
        )*
    ;
>>

recRuleAlt(alt, precOption, opPrec, pred) ::= <<
{}?\<=\> 
>>