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The ANTLR 4 grammar compiler.
There is a newer version: 4.13.2
/*
 * [The "BSD license"]
 *  Copyright (c) 2012 Terence Parr
 *  Copyright (c) 2012 Sam Harwell
 *  All rights reserved.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions
 *  are met:
 *
 *  1. Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *  3. The name of the author may not be used to endorse or promote products
 *     derived from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 *  IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 *  OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 *  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 *  NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package org.antlr.v4.codegen.model;

import org.antlr.v4.codegen.OutputModelFactory;
import org.antlr.v4.codegen.model.decl.CodeBlock;
import org.antlr.v4.tool.ast.GrammarAST;

/** */
public abstract class SrcOp extends OutputModelObject {
	/** Used to create unique var names etc... */
	public int uniqueID; // TODO: do we need?

	/** All operations know in which block they live:
	 *
	 *  	CodeBlock, CodeBlockForAlt
	 *
	 *  Templates might need to know block nesting level or find
	 *  a specific declaration, etc...
	 */
	public CodeBlock enclosingBlock;

	public RuleFunction enclosingRuleRunction;

	public SrcOp(OutputModelFactory factory) { this(factory,null); }
	public SrcOp(OutputModelFactory factory, GrammarAST ast) {
		super(factory,ast);
		if ( ast!=null ) uniqueID = ast.token.getTokenIndex();
		enclosingBlock = factory.getCurrentBlock();
		enclosingRuleRunction = factory.getCurrentRuleFunction();
	}

	/** Walk upwards in model tree, looking for outer alt's code block */
	public CodeBlockForOuterMostAlt getOuterMostAltCodeBlock() {
		if ( this instanceof CodeBlockForOuterMostAlt ) {
			return (CodeBlockForOuterMostAlt)this;
		}
		CodeBlock p = enclosingBlock;
		while ( p!=null ) {
			if ( p instanceof CodeBlockForOuterMostAlt ) {
				return (CodeBlockForOuterMostAlt)p;
			}
			p = p.enclosingBlock;
		}
		return null;
	}

	/** Return label alt or return name of rule */
	public String getContextName() {
		CodeBlockForOuterMostAlt alt = getOuterMostAltCodeBlock();
		if ( alt!=null && alt.altLabel!=null ) return alt.altLabel;
		return enclosingRuleRunction.name;
	}
}