/*
* Copyright (c) 1998-2008 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.*;
import com.caucho.quercus.env.Env;
import com.caucho.quercus.env.NullValue;
import com.caucho.quercus.env.Value;
import com.caucho.quercus.parser.QuercusParser;
import com.caucho.quercus.function.AbstractFunction;
import com.caucho.util.L10N;
import java.util.ArrayList;
/**
* Represents a PHP function expression.
*/
public class FunctionExpr extends Expr {
private static final L10N L = new L10N(FunctionExpr.class);
protected final String _name;
protected final Expr []_args;
public FunctionExpr(Location location, String name, ArrayList<Expr> args)
{
// quercus/120o
super(location);
_name = name.intern();
_args = new Expr[args.size()];
args.toArray(_args);
}
public FunctionExpr(Location location, String name, Expr []args)
{
// quercus/120o
super(location);
_name = name.intern();
_args = args;
}
public FunctionExpr(String name, ArrayList<Expr> args)
{
this(Location.UNKNOWN, name, args);
}
public FunctionExpr(String name, Expr []args)
{
this(Location.UNKNOWN, name, args);
}
/**
* Returns the name.
*/
public String getName()
{
return _name;
}
/**
* Returns the location if known.
*/
public String getFunctionLocation()
{
return " [" + _name + "]";
}
/**
* Returns the reference of the value.
* @param location
*/
@Override
public Expr createRef(QuercusParser parser)
{
return parser.getFactory().createRef(this);
}
/**
* Returns the copy of the value.
* @param location
*/
@Override
public Expr createCopy(ExprFactory factory)
{
return this;
}
/**
* Evaluates the expression.
*
* @param env the calling environment.
*
* @return the expression value.
*/
public Value eval(Env env)
{
return evalImpl(env, false, false);
}
/**
* Evaluates the expression.
*
* @param env the calling environment.
*
* @return the expression value.
*/
public Value evalRef(Env env)
{
return evalImpl(env, true, false);
}
/**
* Evaluates the expression.
*
* @param env the calling environment.
*
* @return the expression value.
*/
public Value evalCopy(Env env)
{
return evalImpl(env, false, true);
}
/**
* Evaluates the expression.
*
* @param env the calling environment.
*
* @return the expression value.
*/
private Value evalImpl(Env env, boolean isRef, boolean isCopy)
{
AbstractFunction fun = env.findFunction(_name);
if (fun == null) {
env.error(getLocationLine(), L.l("'{0}' is an unknown function.", _name));
return NullValue.NULL;
}
Value []args = fun.evalArguments(env, this, _args);
env.pushCall(this, NullValue.NULL, args);
// XXX: qa/1d14 Value oldThis = env.setThis(UnsetValue.NULL);
try {
env.checkTimeout();
if (isRef)
return fun.callRef(env, args);
else if (isCopy)
return fun.callCopy(env, args);
else
return fun.call(env, args);
//} catch (Exception e) {
// throw QuercusException.create(e, env.getStackTrace());
} finally {
env.popCall();
// XXX: qa/1d14 env.setThis(oldThis);
}
}
// Return an array containing the Values to be
// passed in to this function.
public Value []evalArguments(Env env)
{
AbstractFunction fun = env.findFunction(_name);
if (fun == null) {
return null;
}
return fun.evalArguments(env, this, _args);
}
public String toString()
{
return _name + "()";
}
}