/*
* Copyright (c) 1998-2011 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Resin Open Source is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
* of NON-INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
*
* Free Software Foundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Scott Ferguson
*/
package com.caucho.quercus.expr;
import com.caucho.quercus.env.ArrayValue;
import com.caucho.quercus.env.Env;
import com.caucho.quercus.env.LongValue;
import com.caucho.quercus.env.NullValue;
import com.caucho.quercus.env.Value;
import com.caucho.util.L10N;
import java.util.ArrayList;
/**
* Represents a list assignment expression.
*/
public class ListHeadExpr extends Expr {
private static final L10N L = new L10N(ListHeadExpr.class);
protected final Expr []_varList;
protected final Value []_keyList;
private String _varName;
public ListHeadExpr(ArrayList<Expr> varList)
{
_varList = new Expr[varList.size()];
varList.toArray(_varList);
_keyList = new Value[varList.size()];
for (int i = 0; i < varList.size(); i++)
_keyList[i] = LongValue.create(i);
}
public Expr []getVarList()
{
return _varList;
}
/**
* Evaluates the expression.
*
* @param env the calling environment.
*
* @return the expression value.
*/
public Value eval(Env env)
{
throw new UnsupportedOperationException();
}
/**
* Evaluates the expression.
*
* @param env the calling environment.
*
* @return the expression value.
*/
public Value evalAssignValue(Env env, Value value)
{
int len = _varList.length;
for (int i = 0; i < len; i++) {
if (_varList[i] != null)
_varList[i].evalAssignValue(env, value.get(_keyList[i]).copy());
}
return value;
}
public Value evalAssignEachValue(Env env, Value value)
{
if (! (value instanceof ArrayValue)) {
env.error(L.l("variable passed to each must reference an array"));
return NullValue.NULL;
}
ArrayValue array = (ArrayValue) value;
if (_varList.length > 0 && _varList[0] != null)
_varList[0].evalAssignValue(env, array.key());
if (_varList.length > 1 && _varList[1] != null)
_varList[1].evalAssignValue(env, array.current().copy());
return array.each();
}
public boolean evalEachBoolean(Env env, Value value)
{
if (! (value instanceof ArrayValue)) {
env.error(L.l("variable passed to each must reference an array"));
return false;
}
ArrayValue array = (ArrayValue) value;
if (! array.hasCurrent())
return false;
if (_varList.length > 0 && _varList[0] != null)
_varList[0].evalAssignValue(env, array.key());
if (_varList.length > 1 && _varList[1] != null)
_varList[1].evalAssignValue(env, array.current().copy());
array.next();
return true;
}
}