content: /*******************************************************************************
  * Copyright (c) 2010 Luaj.org. All rights reserved.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
  * in the Software without restriction, including without limitation the rights
  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  * copies of the Software, and to permit persons to whom the Software is
  * furnished to do so, subject to the following conditions:
  *
  * The above copyright notice and this permission notice shall be included in
  * all copies or substantial portions of the Software.
  * 
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  ******************************************************************************/
  package org.luaj.vm2.ast;
  
  import org.luaj.vm2.LuaValue;
  
  /** Variable is created lua name scopes, and is a named, lua variable that
   * either refers to a lua local, global, or upvalue storage location.  
   */
  public class Variable {
  	
  	/** The name as it appears in lua source code */
  	public final String name;
  	
  	/** The lua scope in which this variable is defined. */ 
  	public final NameScope definingScope;
  	
  	/** true if this variable is an upvalue */
  	public boolean isupvalue;
  	
  	/** true if there are assignments made to this variable */
  	public boolean hasassignments;
  
  	/** When hasassignments == false, and the initial value is a constant, this is the initial value */
  	public LuaValue initialValue;
  	
  	/** Global is named variable not associated with a defining scope */
  	public Variable(String name) {
  		this.name = name;
  		this.definingScope = null;
  	}
  	public Variable(String name, NameScope definingScope) {
  	/** Local variable is defined in a particular scope.  */
  		this.name = name;
  		this.definingScope = definingScope;
  	}
  	public boolean isLocal() {
  		return this.definingScope != null;
  	}
  	public boolean isConstant() {
  		return ! hasassignments && initialValue != null;
  	}
  }