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<?php
/*
* $Id: IfTask.php 59 2006-04-28 14:49:47Z mrook $
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* This software consists of voluntary contributions made by many individuals
* and is licensed under the LGPL. For more information please see
* <http://phing.info>.
*/
require_once 'phing/tasks/system/condition/ConditionBase.php';
require_once 'phing/tasks/system/SequentialTask.php';
/**
* Perform some tasks based on whether a given condition holds true or
* not.
*
* <p>This task is heavily based on the Condition framework that can
* be found in Ant 1.4 and later, therefore it cannot be used in
* conjunction with versions of Ant prior to 1.4.</p>
*
* <p>This task doesn't have any attributes, the condition to test is
* specified by a nested element - see the documentation of your
* <code><condition></code> task (see
* <a href="http://jakarta.apache.org/ant/manual/CoreTasks/condition.html">the
* online documentation</a> for example) for a complete list of nested
* elements.</p>
*
* <p>Just like the <code><condition></code> task, only a single
* condition can be specified - you combine them using
* <code><and></code> or <code><or></code> conditions.</p>
*
* <p>In addition to the condition, you can specify three different
* child elements, <code><elseif></code>, <code><then></code> and
* <code><else></code>. All three subelements are optional.
*
* Both <code><then></code> and <code><else></code> must not be
* used more than once inside the if task. Both are
* containers for Ant tasks, just like Ant's
* <code><parallel></code> and <code><sequential></code>
* tasks - in fact they are implemented using the same class as Ant's
* <code><sequential></code> task.</p>
*
* The <code><elseif></code> behaves exactly like an <code><if></code>
* except that it cannot contain the <code><else></code> element
* inside of it. You may specify as may of these as you like, and the
* order they are specified is the order they are evaluated in. If the
* condition on the <code><if></code> is false, then the first
* <code><elseif></code> who's conditional evaluates to true
* will be executed. The <code><else></code> will be executed
* only if the <code><if></code> and all <code><elseif></code>
* conditions are false.
*
* <p>Use the following task to define the <code><if></code>
* task before you use it the first time:</p>
*
* <pre><code>
* <taskdef name="if" classname="net.sf.antcontrib.logic.IfTask" />
* </code></pre>
*
* <h3>Crude Example</h3>
*
* <code>
* <if>
* <equals arg1="${foo}" arg2="bar" />
* <then>
* <echo message="The value of property foo is bar" />
* </then>
* <else>
* <echo message="The value of property foo is not bar" />
* </else>
* </if>
* </code>
*
* <code>
* <if>
* <equals arg1="${foo}" arg2="bar" />
* <then>
* <echo message="The value of property foo is 'bar'" />
* </then>
*
* <elseif>
* <equals arg1="${foo}" arg2="foo" />
* <then>
* <echo message="The value of property foo is 'foo'" />
* </then>
* </elseif>
*
* <else>
* <echo message="The value of property foo is not 'foo' or 'bar'" />
* </else>
* </if>
* </code>
*
* @author <a href="mailto:stefan.bodewig@freenet.de">Stefan Bodewig</a>
*/
class IfTask extends ConditionBase {
private $thenTasks = null;
private $elseIfTasks = array();
private $elseTasks = null;
/***
* A nested Else if task
*/
public function addElseIf(ElseIfTask $ei)
{
$this->elseIfTasks[] = $ei;
}
/**
* A nested <then> element - a container of tasks that will
* be run if the condition holds true.
*
* <p>Not required.</p>
*/
public function addThen(SequentialTask $t) {
if ($this->thenTasks != null) {
throw new BuildException("You must not nest more than one <then> into <if>");
}
$this->thenTasks = $t;
}
/**
* A nested <else> element - a container of tasks that will
* be run if the condition doesn't hold true.
*
* <p>Not required.</p>
*/
public function addElse(SequentialTask $e) {
if ($this->elseTasks != null) {
throw new BuildException("You must not nest more than one <else> into <if>");
}
$this->elseTasks = $e;
}
public function main() {
if ($this->countConditions() > 1) {
throw new BuildException("You must not nest more than one condition into <if>");
}
if ($this->countConditions() < 1) {
throw new BuildException("You must nest a condition into <if>");
}
$conditions = $this->getConditions();
$c = $conditions[0];
if ($c->evaluate()) {
if ($this->thenTasks != null) {
$this->thenTasks->main();
}
} else {
$done = false;
$sz = count($this->elseIfTasks);
for($i=0; $i < $sz && !$done; $i++) {
$ei = $this->elseIfTasks[$i];
if ($ei->evaluate()) {
$done = true;
$ei->main();
}
}
if (!$done && $this->elseTasks != null) {
$this->elseTasks->main();
}
}
}
}
/**
* "Inner" class for IfTask.
* This class has same basic structure as the IfTask, although of course it doesn't support <else> tags.
*/
class ElseIfTask extends ConditionBase {
private $thenTasks = null;
public function addThen(SequentialTask $t) {
if ($this->thenTasks != null) {
throw new BuildException("You must not nest more than one <then> into <elseif>");
}
$this->thenTasks = $t;
}
/**
* @return boolean
*/
public function evaluate() {
if ($this->countConditions() > 1) {
throw new BuildException("You must not nest more than one condition into <elseif>");
}
if ($this->countConditions() < 1) {
throw new BuildException("You must nest a condition into <elseif>");
}
$conditions = $this->getConditions();
$c = $conditions[0];
return $c->evaluate();
}
/**
*
*/
public function main() {
if ($this->thenTasks != null) {
$this->thenTasks->main();
}
}
}
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