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The ANTLR 4 grammar compiler.
There is a newer version: 4.9.0
/*
 * [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;


import org.antlr.v4.codegen.model.Choice;
import org.antlr.v4.codegen.model.CodeBlockForAlt;
import org.antlr.v4.codegen.model.LabeledOp;
import org.antlr.v4.codegen.model.Lexer;
import org.antlr.v4.codegen.model.LexerFile;
import org.antlr.v4.codegen.model.Parser;
import org.antlr.v4.codegen.model.ParserFile;
import org.antlr.v4.codegen.model.RuleFunction;
import org.antlr.v4.codegen.model.SrcOp;
import org.antlr.v4.tool.ast.GrammarAST;

import java.util.List;

/** Filter list of SrcOps and return; default is pass-through filter */
public class CodeGeneratorExtension {
	public OutputModelFactory factory;

	public CodeGeneratorExtension(OutputModelFactory factory) {
		this.factory = factory;
	}

	public ParserFile parserFile(ParserFile f) { return f; }

	public Parser parser(Parser p) { return p; }

	public LexerFile lexerFile(LexerFile f) { return f; }

	public Lexer lexer(Lexer l) { return l; }

	public RuleFunction rule(RuleFunction rf) { return rf; }

	public List rulePostamble(List ops) { return ops; }

	public CodeBlockForAlt alternative(CodeBlockForAlt blk, boolean outerMost) { return blk; }

	public CodeBlockForAlt finishAlternative(CodeBlockForAlt blk, boolean outerMost) { return blk; }

	public CodeBlockForAlt epsilon(CodeBlockForAlt blk) { return blk; }

	public List ruleRef(List ops) { return ops; }

	public List tokenRef(List ops) { return ops; }

	public List set(List ops) { return ops; }

	public List stringRef(List ops) { return ops; }

	public List wildcard(List ops) { return ops; }

	// ACTIONS

	public List action(List ops) { return ops; }

	public List sempred(List ops) { return ops; }

	// BLOCKS

	public Choice getChoiceBlock(Choice c) { return c; }

	public Choice getEBNFBlock(Choice c) { return c; }

	public boolean needsImplicitLabel(GrammarAST ID, LabeledOp op) { return false; }
}