/*
 ***** BEGIN LICENSE BLOCK *****
 * Version: EPL 2.0/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Eclipse Public
 * License Version 2.0 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.eclipse.org/legal/epl-v20.html
 *
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 *
 * Copyright (C) 2005 Thomas E Enebo <enebo@acm.org>
 * 
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
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package org.jruby.ast;

import java.util.List;

import org.jruby.RubySymbol;
import org.jruby.ast.types.INameNode;
import org.jruby.ast.visitor.NodeVisitor;
import org.jruby.lexer.yacc.ISourcePosition;

Simple Node for named entities.  Things like the name of a method will make a node
for the name.  Also local variables will make a ArgumentNode. In the case of a local
variable we will also keep a list of it's location.
/**
 * Simple Node for named entities.  Things like the name of a method will make a node
 * for the name.  Also local variables will make a ArgumentNode. In the case of a local
 * variable we will also keep a list of it's location.
 */
public class ArgumentNode extends Node implements INameNode {
    private RubySymbol identifier;
    private int location;

    public ArgumentNode(ISourcePosition position, RubySymbol identifier, int location) {
        super(position, false);

        this.identifier = identifier;
        this.location = location; // All variables should be depth 0 in this case
    }

    public NodeType getNodeType() {
        return NodeType.ARGUMENTNODE;
    }

    @Override
    public <T> T accept(NodeVisitor<T> visitor) {
        return visitor.visitArgumentNode(this);
    }

    
How many scopes should we burrow down to until we need to set the block variable value.
Returns:
0 for current scope, 1 for one down, .../**
     * How many scopes should we burrow down to until we need to set the block variable value.
     *
     * @return 0 for current scope, 1 for one down, ...
     */
    public int getDepth() {
        return location >> 16;
    }

    
Gets the index within the scope construct that actually holds the eval'd value
of this local variable
Returns:
Returns an int offset into storage structure/**
     * Gets the index within the scope construct that actually holds the eval'd value
     * of this local variable
     *
     * @return Returns an int offset into storage structure
     */
    public int getIndex() {
        return location & 0xffff;
    }

    public RubySymbol getName() {
        return identifier;
    }

    public List<Node> childNodes() {
        return EMPTY_LIST;
    }
}