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

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