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<?php
/*
* $Id: PhpEvalTask.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/Task.php';
/**
* Executes PHP function or evaluates expression and sets return value to a property.
*
* WARNING:
* This task can, of course, be abused with devastating effects. E.g. do not
* modify internal Phing classes unless you know what you are doing.
*
* @author Hans Lellelid <hans@xmpl.org>
* @version $Revision: 1.7 $
* @package phing.tasks.system
*
* @todo Add support for evaluating expressions
*/
class PhpEvalTask extends Task {
protected $expression; // Expression to evaluate
protected $function; // Function to execute
protected $class; // Class containing function to execute
protected $returnProperty; // name of property to set to return value
protected $params = array(); // parameters for function calls
/** Main entry point. */
function main() {
if ($this->function === null && $this->expression === null) {
throw new BuildException("You must specify a function to execute or PHP expression to evalute.", $this->location);
}
if ($this->function !== null && $this->expression !== null) {
throw new BuildException("You can specify function or expression, but not both.", $this->location);
}
if ($this->expression !== null && !empty($this->params)) {
throw new BuildException("You cannot use nested <param> tags when evaluationg a PHP expression.", $this->location);
}
$retval = null;
if ($this->function !== null) {
$retval = $this->callFunction();
} elseif ($this->expression !== null) {
$retval = $this->evalExpression();
}
if ($this->returnProperty !== null) {
$this->project->setProperty($this->returnProperty, $retval);
}
}
/**
* Calls function and returns results.
* @return mixed
*/
protected function callFunction() {
if ($this->class !== null) {
// import the classname & unqualify it, if necessary
$this->class = Phing::import($this->class);
$user_func = array($this->class, $this->function);
$h_func = $this->class . '::' . $this->function; // human-readable (for log)
} else {
$user_func = $this->function;
$h_func = $user_func; // human-readable (for log)
}
// put parameters into simple array
$params = array();
foreach($this->params as $p) {
$params[] = $p->getValue();
}
$this->log("Calling PHP function: " . $h_func . "()");
foreach($params as $p) {
$this->log(" param: " . $p, PROJECT_MSG_VERBOSE);
}
$return = call_user_func_array($user_func, $params);
return $return;
}
/**
* Evaluates expression and returns resulting value.
* @return mixed
*/
protected function evalExpression() {
$this->log("Evaluating PHP expression: " . $this->expression);
if (!StringHelper::endsWith(';', trim($this->expression))) {
$this->expression .= ';';
}
$retval = null;
eval('$retval = ' . $this->expression);
return $retval;
}
/** Set function to execute */
public function setFunction($f) {
$this->function = $f;
}
/** Set [static] class which contains function to execute */
public function setClass($c) {
$this->class = $c;
}
/** Sets property name to set with return value of function or expression.*/
public function setReturnProperty($r) {
$this->returnProperty = $r;
}
/** Set PHP expression to evaluate. */
public function addText($expression) {
$this->expression = $expression;
}
/** Set PHP expression to evaluate. */
public function setExpression($expression) {
$this->expression = $expression;
}
/** Add a nested <param> tag. */
public function createParam() {
$p = new FunctionParam();
$this->params[] = $p;
return $p;
}
}
/**
* Supports the <param> nested tag for PhpTask.
*/
class FunctionParam {
private $val;
public function setValue($v) {
$this->val = $v;
}
public function addText($v) {
$this->val = $v;
}
public function getValue() {
return $this->val;
}
}
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