/*
* 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.statement;
import com.caucho.quercus.Location;
import com.caucho.quercus.env.BreakValue;
import com.caucho.quercus.env.ContinueValue;
import com.caucho.quercus.env.Env;
import com.caucho.quercus.env.Value;
import com.caucho.quercus.expr.Expr;
import java.util.ArrayList;
/**
* Represents a switch statement.
*/
public class SwitchStatement extends Statement {
protected final Expr _value;
protected final Expr[][] _cases;
protected final BlockStatement[] _blocks;
protected final Statement _defaultBlock;
protected final String _label;
public SwitchStatement(Location location,
Expr value,
ArrayList<Expr[]> caseList,
ArrayList<BlockStatement> blockList,
Statement defaultBlock,
String label)
{
super(location);
_value = value;
_cases = new Expr[caseList.size()][];
caseList.toArray(_cases);
_blocks = new BlockStatement[blockList.size()];
blockList.toArray(_blocks);
_defaultBlock = defaultBlock;
for (int i = 0; i < _blocks.length; i++) {
_blocks[i].setParent(this);
}
if (_defaultBlock != null)
_defaultBlock.setParent(this);
_label = label;
}
/**
* Executes the 'switch' statement, returning any value.
*/
public Value execute(Env env)
{
try {
Value testValue = _value.eval(env);
int len = _cases.length;
for (int i = 0; i < len; i++) {
Expr []values = _cases[i];
for (int j = 0; j < values.length; j++) {
Value caseValue = values[j].eval(env);
if (testValue.eq(caseValue)) {
Value retValue = _blocks[i].execute(env);
if (retValue instanceof BreakValue) {
return null;
}
else if (retValue instanceof ContinueValue) {
ContinueValue conValue = (ContinueValue) retValue;
int target = conValue.getTarget();
if (target > 1)
return new ContinueValue(target - 1);
else
return null;
}
else
return retValue;
}
}
}
if (_defaultBlock != null) {
Value retValue = _defaultBlock.execute(env);
if (retValue instanceof BreakValue)
return null;
else
return retValue;
}
}
catch (RuntimeException e) {
rethrow(e, RuntimeException.class);
}
return null;
}
/**
* Returns true if control can go past the statement.
*/
public int fallThrough()
{
return FALL_THROUGH;
/* php/367t, php/367u
if (_defaultBlock == null)
return FALL_THROUGH;
int fallThrough = _defaultBlock.fallThrough();
for (int i = 0; i < _blocks.length; i++) {
fallThrough &= _blocks[i].fallThrough();
}
if (fallThrough == BREAK_FALL_THROUGH)
return 0;
else
return fallThrough;
*/
}
}