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The ANTLR 4 grammar compiler.
/*
* 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.
*/
package org.antlr.v4.tool.ast;
import org.antlr.runtime.Token;
import org.antlr.runtime.tree.Tree;
import org.antlr.v4.parse.ANTLRParser;
import org.antlr.v4.tool.Grammar;
public class RuleAST extends GrammarASTWithOptions {
public RuleAST(RuleAST node) {
super(node);
}
public RuleAST(Token t) { super(t); }
public RuleAST(int type) { super(type); }
public boolean isLexerRule() {
String name = getRuleName();
return name!=null && Grammar.isTokenName(name);
}
public String getRuleName() {
GrammarAST nameNode = (GrammarAST)getChild(0);
if ( nameNode!=null ) return nameNode.getText();
return null;
}
@Override
public RuleAST dupNode() { return new RuleAST(this); }
public ActionAST getLexerAction() {
Tree blk = getFirstChildWithType(ANTLRParser.BLOCK);
if ( blk.getChildCount()==1 ) {
Tree onlyAlt = blk.getChild(0);
Tree lastChild = onlyAlt.getChild(onlyAlt.getChildCount()-1);
if ( lastChild.getType()==ANTLRParser.ACTION ) {
return (ActionAST)lastChild;
}
}
return null;
}
@Override
public Object visit(GrammarASTVisitor v) { return v.visit(this); }
}