/*
* 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.StringBuilderValue;
import com.caucho.quercus.env.UnicodeValueImpl;
import com.caucho.quercus.env.Value;
import com.caucho.quercus.parser.QuercusParser;
/**
* Represents a PHP constant expression.
*/
public class ConstExpr extends Expr {
protected final String _var;
public ConstExpr(Location location, String var)
{
super(location);
_var = var;
}
public ConstExpr(String var)
{
this(Location.UNKNOWN, var);// acceptable, for compiled code
}
/**
* Returns the variable.
*/
public String getVar()
{
return _var;
}
//
// expression creation
//
/**
* Creates a class field Foo::bar
*/
@Override
public Expr createClassConst(QuercusParser parser, String name)
{
ExprFactory factory = parser.getExprFactory();
String className = _var;
String specialClassName = getSpecialClassName();
if ("self".equals(specialClassName)) {
className = parser.getSelfClassName();
return factory.createClassConst(className, name);
}
else if ("parent".equals(specialClassName)) {
className = parser.getParentClassName();
return factory.createClassConst(className, name);
}
else if ("static".equals(specialClassName)) {
return factory.createClassVirtualConst(name);
}
else {
return factory.createClassConst(className, name);
}
}
/**
* Creates a class field Foo::$bar
*/
@Override
public Expr createClassField(QuercusParser parser, String name)
{
ExprFactory factory = parser.getExprFactory();
String className = _var;
String specialClassName = getSpecialClassName();
if ("self".equals(specialClassName)) {
className = parser.getSelfClassName();
return factory.createClassField(className, name);
}
else if ("parent".equals(specialClassName)) {
className = parser.getParentClassName();
return factory.createClassField(className, name);
}
else if ("static".equals(specialClassName)) {
return factory.createClassVirtualField(name);
}
else {
return factory.createClassField(className, name);
}
}
/**
* Creates a class field Foo::${bar}
*/
@Override
public Expr createClassField(QuercusParser parser, Expr name)
{
ExprFactory factory = parser.getExprFactory();
String className = _var;
String specialClassName = getSpecialClassName();
if ("self".equals(specialClassName)) {
className = parser.getSelfClassName();
return factory.createClassField(className, name);
}
else if ("parent".equals(specialClassName)) {
className = parser.getParentClassName();
return factory.createClassField(className, name);
}
else if ("static".equals(specialClassName)) {
return factory.createClassVirtualField(name);
}
else {
return factory.createClassField(className, name);
}
}
private String getSpecialClassName()
{
String className = _var;
int ns = className.lastIndexOf('\\');
if (ns >= 0) {
return className.substring(ns + 1);
}
else {
return className;
}
}
/**
* Returns true for literal
*/
public Value evalConstant()
{
return new StringBuilderValue(_var);
}
/**
* Evaluates the expression.
*
* @param env the calling environment.
*
* @return the expression value.
*/
public Value eval(Env env)
{
return env.getConstant(_var);
}
public String toString()
{
return _var;
}
}