org.antlr.v4.tool.ast.RuleAST Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of antlr4 Show documentation
Show all versions of antlr4 Show documentation
The ANTLR 4 grammar compiler.
The newest version!
/*
* 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); }
}