/*
* Copyright (c) 1998-2010 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.Location;
import com.caucho.quercus.env.Env;
import com.caucho.quercus.env.ArgRef;
import com.caucho.quercus.env.Value;
import com.caucho.quercus.env.Var;
import com.caucho.quercus.lib.VariableModule;
import com.caucho.quercus.parser.QuercusParser;
/**
* Represents a PHP reference argument.
*/
public class UnaryRefExpr extends AbstractUnaryExpr {
public UnaryRefExpr(Location location, Expr expr)
{
super(location, expr);
}
public UnaryRefExpr(Expr expr)
{
super(expr);
}
/**
* Returns true for a reference.
*/
public boolean isRef()
{
return true;
}
/**
* Creates an assignment using this value as the right hand side.
*/
@Override
public Expr createAssignFrom(QuercusParser parser,
AbstractVarExpr leftHandSide)
{
ExprFactory factory = parser.getExprFactory();
return factory.createAssignRef(leftHandSide, _expr);
}
/**
* Evaluates the expression.
*
* @param env the calling environment.
*
* @return the expression value.
*/
public Value eval(Env env)
{
// quercus/0d28
Value value = getExpr().evalVar(env);
return value.toRef();
}
/**
* Evaluates the expression.
*
* @param env the calling environment.
*
* @return the expression value.
*/
@Override
public Value evalArg(Env env, boolean isTop)
{
Value value = getExpr().evalVar(env);
return value.toArgRef();
}
/**
* Evaluates the expression.
*
* @param env the calling environment.
*
* @return the expression value.
*/
public Var evalVar(Env env)
{
Var value = getExpr().evalVar(env);
// php/112d
return value;
/*
if (value instanceof Var)
return new RefVar((Var) value);
else
return value;
*/
}
public String toString()
{
return _expr.toString();
}
}