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 java.util.List;
  
  import org.luaj.vm2.ast.Exp.VarExp;
  
  abstract public class Visitor {
  	public void visit(Chunk chunk) { 
  		chunk.block.accept(this); 
  	};
  	public void visit(Block block) {
  		visit(block.scope);
  		if ( block.stats != null )
  			for ( int i=0, n=block.stats.size(); i<n; i++ )
  				((Stat)block.stats.get(i)).accept(this);
  	};
  	public void visit(Stat.Assign stat) {
  		visitVars(stat.vars);
  		visitExps(stat.exps);
  	}
  	public void visit(Stat.Break breakstat) {
  	}
  	public void visit(Stat.FuncCallStat stat) {
  		stat.funccall.accept(this);
  	}
  	public void visit(Stat.FuncDef stat) {
  		stat.body.accept(this);
  	}
  	public void visit(Stat.GenericFor stat) {
  		visit(stat.scope);
  		visitNames(stat.names);
  		visitExps(stat.exps);
  		stat.block.accept(this);
  	}
  	public void visit(Stat.IfThenElse stat) {
  		stat.ifexp.accept(this);
  		stat.ifblock.accept(this);
  		if ( stat.elseifblocks != null ) 
  			for ( int i=0, n=stat.elseifblocks.size(); i<n; i++ ) {
  				((Exp)stat.elseifexps.get(i)).accept(this);
  				((Block)stat.elseifblocks.get(i)).accept(this);
  			}
  		if ( stat.elseblock != null )
  			visit( stat.elseblock );
  	}
  	public void visit(Stat.LocalAssign stat) {
  		visitNames(stat.names);
  		visitExps(stat.values);
  	}
  	public void visit(Stat.LocalFuncDef stat) {
  		visit(stat.name);
  		stat.body.accept(this);
  	}
  	public void visit(Stat.NumericFor stat) {
  		visit(stat.scope);
  		visit(stat.name);
  		stat.initial.accept(this);
  		stat.limit.accept(this);
  		if ( stat.step != null )
  			stat.step.accept(this);
  		stat.block.accept(this);
  	}
  	public void visit(Stat.RepeatUntil stat) {
  		stat.block.accept(this);
  		stat.exp.accept(this);
  	}
  	public void visit(Stat.Return stat) {
  		visitExps(stat.values);
  	}
  	public void visit(Stat.WhileDo stat) {
  		stat.exp.accept(this);
  		stat.block.accept(this);
  	}
  	public void visit(FuncBody body) {
  		visit(body.scope);
  		body.parlist.accept(this);
  		body.block.accept(this);
  	}
  	public void visit(FuncArgs args) {
  		visitExps(args.exps);
  	}
  	public void visit(TableField field) {
  		if ( field.name != null );
  			visit( field.name );
  		if ( field.index != null )
  			field.index.accept(this);
  		field.rhs.accept(this);
  	}
  	public void visit(Exp.AnonFuncDef exp) {
  		exp.body.accept(this);
  	}
  	public void visit(Exp.BinopExp exp) {
  		exp.lhs.accept(this);
  		exp.rhs.accept(this);
  	}
  	public void visit(Exp.Constant exp) {
  	}
  	public void visit(Exp.FieldExp exp) {
  		exp.lhs.accept(this);
  		visit(exp.name);
  	}
  	public void visit(Exp.FuncCall exp) {
  		exp.lhs.accept(this);
  		exp.args.accept(this);
  	}
  	public void visit(Exp.IndexExp exp) {
  		exp.lhs.accept(this);
  		exp.exp.accept(this);
  	}
  	public void visit(Exp.MethodCall exp) {
  		exp.lhs.accept(this);
  		visit(exp.name);
  		exp.args.accept(this);
  	}
  	public void visit(Exp.NameExp exp) {
  		visit(exp.name);
  	}
  	public void visit(Exp.ParensExp exp) {
  		exp.exp.accept(this);
  	}
  	public void visit(Exp.UnopExp exp) {
  		exp.rhs.accept(this);
  	}
  	public void visit(Exp.VarargsExp exp) {
  	}
  	public void visit(ParList pars) {
  		visitNames(pars.names);
  	}
  	public void visit(TableConstructor table) {
  		if( table.fields != null)
  			for ( int i=0, n=table.fields.size(); i<n; i++ )
  				((TableField)table.fields.get(i)).accept(this);
  	}
  	public void visitVars(List<VarExp> vars) {
  		if ( vars != null )
  			for ( int i=0, n=vars.size(); i<n; i++ )
  				((Exp.VarExp)vars.get(i)).accept(this);
  	}
  	public void visitExps(List<Exp> exps) {
  		if ( exps != null )
  			for ( int i=0, n=exps.size(); i<n; i++ )
  				((Exp)exps.get(i)).accept(this);
  	}
  	public void visitNames(List<Name> names) {
  		if ( names != null )
  			for ( int i=0, n=names.size(); i<n; i++ )
  				visit((Name) names.get(i));
  	}
  	public void visit(Name name) {
  	}
  	public void visit(String name) {
  	}
  	public void visit(NameScope scope) {
  	}
  	public void visit(Stat.Goto gotostat) {
  	}
  	public void visit(Stat.Label label) {
  	}
  }
  