/*
* 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 java.io.IOException;
import java.util.ArrayList;
import com.caucho.quercus.Location;
import com.caucho.quercus.env.Env;
import com.caucho.quercus.env.Value;
import com.caucho.quercus.env.StringValue;
import com.caucho.quercus.env.Var;
import com.caucho.quercus.parser.QuercusParser;
import com.caucho.quercus.program.InterpretedClassDef;
import com.caucho.util.L10N;
/**
* Represents a PHP field reference.
*/
public class ThisFieldExpr extends AbstractVarExpr {
private static final L10N L = new L10N(ThisFieldExpr.class);
protected final ThisExpr _qThis;
protected final StringValue _name;
public ThisFieldExpr(ThisExpr qThis, StringValue name)
{
_qThis = qThis;
_name = name;
}
private Value cannotUseThisError(Env env)
{
return env.error(getLocation(),
"Cannot use '$this' when not in object context.");
}
//
// function call creation
//
/**
* Creates a function call expression
*/
@Override
public Expr createCall(QuercusParser parser,
Location location,
ArrayList<Expr> args)
throws IOException
{
ExprFactory factory = parser.getExprFactory();
return factory.createThisMethod(location, _qThis, _name.toString(), args);
}
/**
* Evaluates the expression.
*
* @param env the calling environment.
*
* @return the expression value.
*/
public Value eval(Env env)
{
Value obj = env.getThis();
if (obj.isNull())
return cannotUseThisError(env);
return obj.getThisField(env, _name);
}
/**
* Evaluates the expression.
*
* @param env the calling environment.
*
* @return the expression value.
*/
public Value evalCopy(Env env)
{
Value obj = env.getThis();
if (obj.isNull())
return cannotUseThisError(env);
return obj.getThisField(env, _name).copy();
}
/**
* Evaluates the expression.
*
* @param env the calling environment.
*
* @return the expression value.
*/
@Override
public Var evalVar(Env env)
{
Value obj = env.getThis();
if (obj.isNull()) {
cannotUseThisError(env);
return new Var();
}
return obj.getThisFieldVar(env, _name);
}
/**
* Evaluates the expression.
*
* @param env the calling environment.
*
* @return the expression value.
*/
@Override
public Value evalArg(Env env, boolean isTop)
{
Value obj = env.getThis();
if (obj.isNull())
return cannotUseThisError(env);
return obj.getThisFieldArg(env, _name);
}
/**
* Evaluates the expression.
*
* @param env the calling environment.
*
* @return the expression value.
*/
@Override
public Value evalAssignValue(Env env, Value value)
{
Value obj = env.getThis();
if (obj.isNull())
cannotUseThisError(env);
obj.putThisField(env, _name, value);
return value;
}
/**
* Evaluates the expression.
*
* @param env the calling environment.
*
* @return the expression value.
*/
@Override
public Value evalAssignRef(Env env, Value value)
{
Value obj = env.getThis();
if (obj.isNull())
cannotUseThisError(env);
obj.putThisField(env, _name, value);
return value;
}
/**
* Evaluates as an array index assign ($a[index] = value).
*/
@Override
public Value evalArrayAssign(Env env, Value index, Value value)
{
Value obj = env.getThis();
if (obj.isNull())
cannotUseThisError(env);
Value fieldVar = obj.getThisFieldVar(env, _name);
// php/03mm
return fieldVar.put(index, value);
}
/**
* Evaluates the expression, creating an array if the value is unset..
*
* @param env the calling environment.
*
* @return the expression value.
*/
public Value evalArray(Env env)
{
Value obj = env.getThis();
if (obj.isNull())
return cannotUseThisError(env);
return obj.getThisFieldArray(env, _name);
}
/**
* Evaluates the expression, creating an array if the value is unset..
*
* @param env the calling environment.
*
* @return the expression value.
*/
public Value evalObject(Env env)
{
Value obj = env.getThis();
if (obj.isNull())
return cannotUseThisError(env);
return obj.getThisFieldObject(env, _name);
}
/**
* Evaluates the expression.
*
* @param env the calling environment.
*
* @return the expression value.
*/
public void evalUnset(Env env)
{
Value obj = env.getThis();
if (obj.isNull())
cannotUseThisError(env);
obj.unsetThisField(_name);
}
public String toString()
{
return "$this->" + _name;
}
}