/*
* 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.Location;
import com.caucho.quercus.env.ArrayValueImpl;
import com.caucho.quercus.env.Env;
import com.caucho.quercus.env.MethodIntern;
import com.caucho.quercus.env.NullValue;
import com.caucho.quercus.env.Value;
import com.caucho.quercus.env.StringValue;
import com.caucho.quercus.env.ConstStringValue;
import com.caucho.quercus.env.Var;
import com.caucho.quercus.parser.QuercusParser;
/**
* Represents a PHP variable expression.
*/
public class VarExpr
extends AbstractVarExpr
{
private final VarInfo _var;
protected final StringValue _name;
private VarState _varState = VarState.INIT;
protected VarExpr(Location location, VarInfo var)
{
super(location);
_var = var;
_name = var.getName();
}
protected VarExpr(VarInfo var)
{
_var = var;
_name = var.getName();
}
/**
* Returns the variable info.
*/
public VarInfo getVarInfo()
{
return _var;
}
/**
* Returns the variable name.
*/
public StringValue getName()
{
return _name;
}
/**
* Returns the java variable name.
*/
public String getJavaVar()
{
return "v_" + _name;
}
/**
* Copy for things like $a .= "test";
* @param location
*/
public Expr copy(Location location)
{
return new VarExpr(location, _var);
}
/**
* Creates the assignment.
*/
@Override
public Expr createAssign(QuercusParser parser, Expr value)
{
// _var.setAssigned();
return super.createAssign(parser, value);
}
/**
* Creates the assignment.
*/
@Override
public void assign(QuercusParser parser)
{
// _var.setAssigned();
}
/**
* Creates the assignment.
*/
@Override
public Expr createAssignRef(QuercusParser parser,
Expr value)
{
// _var.setAssigned();
return super.createAssignRef(parser, value);
}
/**
* Evaluates the expression.
*
* @param env the calling environment.
* @return the expression value.
*/
@Override
public Value eval(Env env)
{
return env.getValue(_name, false, true);
}
/**
* Evaluates the expression.
*
* @param env the calling environment.
* @return the expression value.
*/
@Override
public Value evalTop(Env env)
{
return env.getValue(_name, false, false);
}
/**
* Evaluates the expression as an isset() statement.
*/
public boolean evalIsset(Env env)
{
return env.getValue(_name, false, false).isset();
}
/**
* Evaluates the expression.
*
* @param env the calling environment.
* @return the expression value.
*/
@Override
public Value evalCopy(Env env)
{
return eval(env).copy();
}
/**
* Evaluates the expression, converting to an array if unset.
*
* @param env the calling environment.
* @return the expression value.
*/
@Override
public Value evalArray(Env env)
{
Value value;
/*
if (_var.isGlobal()) {
value = env.getGlobalValue(_name);
if (value == null) {
value = new ArrayValueImpl();
env.setGlobalValue(_name, value);
}
else {
Value array = value.toAutoArray();
if (array != value) {
env.setGlobalValue(_name, array);
value = array;
}
}
*/
//} else {
value = env.getVar(_name);
if (value == null) {
value = new ArrayValueImpl();
env.setValue(_name, value);
}
else {
value = value.toAutoArray();
}
// }
return value;
}
/**
* Evaluates the expression, converting to an object if is unset, NULL,
* or is a string.
*
* @param env the calling environment.
* @return the expression value.
*/
public Value evalObject(Env env)
{
Value value;
/*
if (_var.isGlobal()) {
value = env.getGlobalValue(_name);
if (value == null || value.isString() || value.isNull()) {
value = env.createObject();
env.setGlobalValue(_name, value);
}
} else {
*/
value = env.getValue(_name);
if (value == null || value.isString() || value.isNull()) {
value = env.createObject();
env.setValue(_name, value);
}
//}
return value;
}
/**
* Evaluates the expression.
*
* @param env the calling environment.
* @return the expression value.
*/
public Var evalVar(Env env)
{
return env.getVar(_name);
}
/**
* Evaluates the expression.
*
* @param env the calling environment.
* @return the expression value.
*/
@Override
public Value evalArg(Env env, boolean isTop)
{
// php/043k
// php/0443
return env.getVar(_name);
}
/**
* Evaluates the expression. The value must not be a Var.
*
* @param env the calling environment.
*/
@Override
public Value evalAssignValue(Env env, Value value)
{
// php/0232
env.setValue(_name, value);
return value;
}
/**
* Evaluates the expression.
*
* @param env the calling environment.
*/
@Override
public Value evalAssignRef(Env env, Value value)
{
env.setRef(_name, value);
return value;
}
/**
* Evaluates the expression.
*
* @param env the calling environment.
*/
@Override
public void evalUnset(Env env)
{
// php/023b
/*
if (getVarInfo().isGlobal())
env.unsetGlobalVar(_name);
else
*/
env.unsetLocalVar(_name);
}
public int hashCode()
{
return _name.hashCode();
}
public boolean equals(Object o)
{
if (this == o)
return true;
else if (getClass() != o.getClass())
return false;
VarExpr var = (VarExpr) o;
return _var == var._var;
}
public String toString()
{
return "$" + _name;
}
}