Subversion-Projekte lars-tiefland.php_share

<?php

/*

 *  $Id: IfTask.php 43 2006-03-10 14:31:51Z 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&gt;</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&gt;</code> task, only a single

 * condition can be specified - you combine them using

 * <code><and&gt;</code> or <code><or&gt;</code> conditions.</p>

 *

 * <p>In addition to the condition, you can specify three different

 * child elements, <code><elseif&gt;</code>, <code><then&gt;</code> and

 * <code><else&gt;</code>.  All three subelements are optional.

 *

 * Both <code><then&gt;</code> and <code><else&gt;</code> must not be

 * used more than once inside the if task.  Both are

 * containers for Ant tasks, just like Ant's

 * <code><parallel&gt;</code> and <code><sequential&gt;</code>

 * tasks - in fact they are implemented using the same class as Ant's

 * <code><sequential&gt;</code> task.</p>

 *

 *  The <code><elseif&gt;</code> behaves exactly like an <code><if&gt;</code>

 * except that it cannot contain the <code><else&gt;</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&gt;</code> is false, then the first

 * <code><elseif&gt;</code> who's conditional evaluates to true

 * will be executed.  The <code><else&gt;</code> will be executed

 * only if the <code><if&gt;</code> and all <code><elseif&gt;</code>

 * conditions are false.

 *

 * <p>Use the following task to define the <code><if&gt;</code>

 * task before you use it the first time:</p>

 *

 * <pre><code>

 *   <taskdef name="if" classname="net.sf.antcontrib.logic.IfTask" /&gt;

 * </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" /&gt;

 *  <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();

            }

        }

    }