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<?php
/*
* $Id: IntrospectionHelper.php,v 1.19 2005/11/08 20:45:59 hlellelid Exp $
*
* 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>.
*/
include_once 'phing/types/Reference.php';
include_once 'phing/types/Path.php';
include_once 'phing/util/StringHelper.php';
/**
* Helper class that collects the methods that a task or nested element
* holds to set attributes, create nested elements or hold PCDATA
* elements.
*
*<ul>
* <li><strong>SMART-UP INLINE DOCS</strong></li>
* <li><strong>POLISH-UP THIS CLASS</strong></li>
*</ul>
*
* @author Andreas Aderhold <andi@binarycloud.com>
* @author Hans Lellelid <hans@xmpl.org>
* @copyright © 2001,2002 THYRELL. All rights reserved
* @version $Revision: 1.19 $
* @package phing
*/
class IntrospectionHelper {
/**
* Holds the attribute setter methods.
*
* @var array string[]
*/
private $attributeSetters = array();
/**
* Holds methods to create nested elements.
*
* @var array string[]
*/
private $nestedCreators = array();
/**
* Holds methods to store configured nested elements.
*
* @var array string[]
*/
private $nestedStorers = array();
/**
* Map from attribute names to nested types.
*/
private $nestedTypes = array();
/**
* New idea in phing: any class can register certain
* keys -- e.g. "task.current_file" -- which can be used in
* task attributes, if supported. In the build XML these
* are referred to like this:
* <regexp pattern="\n" replace="%{task.current_file}"/>
* In the type/task a listener method must be defined:
* function setListeningReplace($slot) {}
* @var array string[]
*/
private $slotListeners = array();
/**
* The method to add PCDATA stuff.
*
* @var string Method name of the addText (redundant?) method, if class supports it :)
*/
private $methodAddText = null;
/**
* The Class that's been introspected.
*
* @var object
* @access private
*/
private $bean;
/**
* The cache of IntrospectionHelper classes instantiated by getHelper().
* @var array IntrospectionHelpers[]
*/
private static $helpers = array();
/**
* Factory method for helper objects.
*
* @param string $class The class to create a Helper for
*/
public static function getHelper($class) {
if (!isset(self::$helpers[$class])) {
self::$helpers[$class] = new IntrospectionHelper($class);
}
return self::$helpers[$class];
}
/**
* This function constructs a new introspection helper for a specific class.
*
* This method loads all methods for the specified class and categorizes them
* as setters, creators, slot listeners, etc. This way, the setAttribue() doesn't
* need to perform any introspection -- either the requested attribute setter/creator
* exists or it does not & a BuildException is thrown.
*
* @param string $bean The classname for this IH.
*/
function __construct($class) {
$this->bean = new ReflectionClass($class);
//$methods = get_class_methods($bean);
foreach($this->bean->getMethods() as $method) {
if ($method->isPublic()) {
// We're going to keep case-insensitive method names
// for as long as we're allowed :) It makes it much
// easier to map XML attributes to PHP class method names.
$name = strtolower($method->getName());
// There are a few "reserved" names that might look like attribute setters
// but should actually just be skipped. (Note: this means you can't ever
// have an attribute named "location" or "tasktype" or a nested element named "task".)
if ($name === "setlocation" || $name === "settasktype" || $name === "addtask") {
continue;
}
if ($name === "addtext") {
$this->methodAddText = $method;
} elseif (strpos($name, "setlistening") === 0) {
// Phing supports something unique called "RegisterSlots"
// These are dynamic values that use a basic slot system so that
// classes can register to listen to specific slots, and the value
// will always be grabbed from the slot (and never set in the project
// component). This is useful for things like tracking the current
// file being processed by a filter (e.g. AppendTask sets an append.current_file
// slot, which can be ready by the XSLTParam type.)
if (count($method->getParameters()) !== 1) {
throw new BuildException($method->getDeclaringClass()->getName()."::".$method->getName()."() must take exactly one parameter.");
}
$this->slotListeners[$name] = $method;
} elseif (strpos($name, "set") === 0) {
// A standard attribute setter.
if (count($method->getParameters()) !== 1) {
throw new BuildException($method->getDeclaringClass()->getName()."::".$method->getName()."() must take exactly one parameter.");
}
$this->attributeSetters[$name] = $method;
} elseif (strpos($name, "create") === 0) {
if (count($method->getParameters()) > 0) {
throw new BuildException($method->getDeclaringClass()->getName()."::".$method->getName()."() may not take any parameters.");
}
// Because PHP doesn't support return types, we are going to do
// two things here to guess return type:
// 1) parse comments for an explicit value
// 2) if that fails, assume that the part of the method after "create"
// is the name of the return type (in many cases it is not)
// This isn't super important -- i.e. we're not instantaiting classes
// based on this information. It's more just so that IntrospectionHelper
// can keep track of all the nested types -- and provide more helpful
// exception messages, etc.
preg_match('/@return[\s]+([\w]+)/', $method->getDocComment(), $matches);
if (!empty($matches[1]) && class_exists($matches[1], false)) {
$this->nestedTypes[$name] = $matches[1];
} else {
// assume that method createEquals() creates object of type "Equals"
// (that example would be false, of course)
$this->nestedTypes[$name] = $this->getPropertyName($name, "create");
}
$this->nestedCreators[$name] = $method;
} elseif (strpos($name, "addconfigured") === 0) {
// *must* use class hints if using addConfigured ...
// 1 param only
$params = $method->getParameters();
if (count($params) < 1) {
throw new BuildException($method->getDeclaringClass()->getName()."::".$method->getName()."() must take at least one parameter.");
}
if (count($params) > 1) {
$this->warn($method->getDeclaringClass()->getName()."::".$method->getName()."() takes more than one parameter. (IH only uses the first)");
}
$classname = null;
if (($hint = $params[0]->getClass()) !== null) {
$classname = $hint->getName();
}
if ($classname === null) {
throw new BuildException($method->getDeclaringClass()->getName()."::".$method->getName()."() method MUST use a class hint to indicate the class type of parameter.");
}
$this->nestedTypes[$name] = $classname;
$this->nestedStorers[$name] = $method;
} elseif (strpos($name, "add") === 0) {
// *must* use class hints if using add ...
// 1 param only
$params = $method->getParameters();
if (count($params) < 1) {
throw new BuildException($method->getDeclaringClass()->getName()."::".$method->getName()."() must take at least one parameter.");
}
if (count($params) > 1) {
$this->warn($method->getDeclaringClass()->getName()."::".$method->getName()."() takes more than one parameter. (IH only uses the first)");
}
$classname = null;
if (($hint = $params[0]->getClass()) !== null) {
$classname = $hint->getName();
}
// we don't use the classname here, but we need to make sure it exists before
// we later try to instantiate a non-existant class
if ($classname === null) {
throw new BuildException($method->getDeclaringClass()->getName()."::".$method->getName()."() method MUST use a class hint to indicate the class type of parameter.");
}
$this->nestedCreators[$name] = $method;
}
} // if $method->isPublic()
} // foreach
}
/** Sets the named attribute. */
function setAttribute(Project $project, $element, $attributeName, &$value) {
// we want to check whether the value we are setting looks like
// a slot-listener variable: %{task.current_file}
//
// slot-listener variables are not like properties, in that they cannot be mixed with
// other text values. The reason for this disparity is that properties are only
// set when first constructing objects from XML, whereas slot-listeners are always dynamic.
//
// This is made possible by PHP5 (objects automatically passed by reference) and PHP's loose
// typing.
if (StringHelper::isSlotVar($value)) {
$as = "setlistening" . strtolower($attributeName);
if (!isset($this->slotListeners[$as])) {
$msg = $this->getElementName($project, $element) . " doesn't support a slot-listening '$attributeName' attribute.";
throw new BuildException($msg);
}
$method = $this->slotListeners[$as];
$key = StringHelper::slotVar($value);
$value = Register::getSlot($key); // returns a RegisterSlot object which will hold current value of that register (accessible using getValue())
} else {
// Traditional value options
$as = "set".strtolower($attributeName);
if (!isset($this->attributeSetters[$as])) {
$msg = $this->getElementName($project, $element) . " doesn't support the '$attributeName' attribute.";
throw new BuildException($msg);
}
$method = $this->attributeSetters[$as];
if ($as == "setrefid") {
$value = new Reference($value);
} else {
// decode any html entities in string
$value = html_entity_decode($value);
// value is a string representation of a boolean type,
// convert it to primitive
if (StringHelper::isBoolean($value)) {
$value = StringHelper::booleanValue($value);
}
// does method expect a PhingFile object? if so, then
// pass a project-relative file.
$params = $method->getParameters();
$classname = null;
if (($hint = $params[0]->getClass()) !== null) {
$classname = $hint->getName();
}
// there should only be one param; we'll just assume ....
if ($classname !== null) {
switch(strtolower($classname)) {
case "phingfile":
$value = $project->resolveFile($value);
break;
case "path":
$value = new Path($project, $value);
break;
case "reference":
$value = new Reference($value);
break;
// any other object params we want to support should go here ...
}
} // if hint !== null
} // if not setrefid
} // if is slot-listener
try {
$project->log(" -calling setter ".$method->getDeclaringClass()->getName()."::".$method->getName()."()", PROJECT_MSG_DEBUG);
$method->invoke($element, $value);
} catch(Exception $exc) {
throw new BuildException($exc);
}
}
/** Adds PCDATA areas.*/
function addText(Project $project, $element, $text) {
if ($this->methodAddText === null) {
$msg = $this->getElementName($project, $element)." doesn't support nested text data.";
throw new BuildException($msg);
}
try {
$method = $this->methodAddText;
$method->invoke($element, $text);
} catch (Exception $exc) {
throw new BuildException($exc);
}
}
/**
* Creates a named nested element.
*
* Valid creators can be in the form createFoo() or addFoo(Bar).
* @return object Returns the nested element.
* @throws BuildException
*/
function createElement(Project $project, $element, $elementName) {
$addMethod = "add".strtolower($elementName);
$createMethod = "create".strtolower($elementName);
$nestedElement = null;
if (isset($this->nestedCreators[$createMethod])) {
$method = $this->nestedCreators[$createMethod];
try { // try to invoke the creator method on object
$project->log(" -calling creator ".$method->getDeclaringClass()->getName()."::".$method->getName()."()", PROJECT_MSG_DEBUG);
$nestedElement = $method->invoke($element);
} catch (Exception $exc) {
throw new BuildException($exc);
}
} elseif (isset($this->nestedCreators[$addMethod])) {
$method = $this->nestedCreators[$addMethod];
// project components must use class hints to support the add methods
try { // try to invoke the adder method on object
$project->log(" -calling adder ".$method->getDeclaringClass()->getName()."::".$method->getName()."()", PROJECT_MSG_DEBUG);
// we've already assured that correct num of params
// exist and that method is using class hints
$params = $method->getParameters();
$classname = null;
if (($hint = $params[0]->getClass()) !== null) {
$classname = $hint->getName();
}
// create a new instance of the object and add it via $addMethod
$nestedElement = new $classname();
$method->invoke($element, $nestedElement);
} catch (Exception $exc) {
throw new BuildException($exc);
}
} else {
$msg = $this->getElementName($project, $element) . " doesn't support the '$elementName' creator/adder.";
throw new BuildException($msg);
}
if ($nestedElement instanceof ProjectComponent) {
$nestedElement->setProject($project);
}
return $nestedElement;
}
/**
* Creates a named nested element.
* @return void
* @throws BuildException
*/
function storeElement($project, $element, $child, $elementName = null) {
if ($elementName === null) {
return;
}
$storer = "addconfigured".strtolower($elementName);
if (isset($this->nestedStorers[$storer])) {
$method = $this->nestedStorers[$storer];
try {
$project->log(" -calling storer ".$method->getDeclaringClass()->getName()."::".$method->getName()."()", PROJECT_MSG_DEBUG);
$method->invoke($element, $child);
} catch (Exception $exc) {
throw new BuildException($exc);
}
}
}
/** Does the introspected class support PCDATA? */
function supportsCharacters() {
return ($this->methodAddText !== null);
}
/** Return all attribues supported by the introspected class. */
function getAttributes() {
$attribs = array();
foreach (array_keys($this->attributeSetters) as $setter) {
$attribs[] =$this->getPropertyName($setter, "set");
}
return $attribs;
}
/** Return all nested elements supported by the introspected class. */
function getNestedElements() {
return $this->nestedTypes;
}
/**
* Get the the name for an element.
* When possible the full classnam (phing.tasks.system.PropertyTask) will
* be returned. If not available (loaded in taskdefs or typedefs) then the
* XML element name will be returned.
*
* @param Project $project
* @param object $element The Task or type element.
* @return string Fully qualified class name of element when possible.
*/
function getElementName(Project $project, $element) {
$taskdefs = $project->getTaskDefinitions();
$typedefs = $project->getDataTypeDefinitions();
// check if class of element is registered with project (tasks & types)
// most element types don't have a getTag() method
$elClass = get_class($element);
if (!in_array('getTag', get_class_methods($elClass))) {
// loop through taskdefs and typesdefs and see if the class name
// matches (case-insensitive) any of the classes in there
foreach(array_merge($taskdefs, $typedefs) as $elName => $class) {
if (0 === strcasecmp($elClass, StringHelper::unqualify($class))) {
return $class;
}
}
return "$elClass (unknown)";
} else {
// ->getTag() method does exist, so use it
$elName = $element->getTag();
if (isset($taskdefs[$elName])) {
return $taskdefs[$elName];
} elseif (isset($typedefs[$elName])) {
return $typedefs[$elName];
} else {
return "$elName (unknown)";
}
}
}
/** extract the name of a property from a method name - subtracting a given prefix. */
function getPropertyName($methodName, $prefix) {
$start = strlen($prefix);
return strtolower(substr($methodName, $start));
}
/**
* Prints warning message to screen if -debug was used.
*/
function warn($msg) {
if (Phing::getMsgOutputLevel() === PROJECT_MSG_DEBUG) {
print("[IntrospectionHelper] " . $msg . "\n");
}
}
}
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