silverstripe-framework/src/View/SSViewer_DataPresenter.php

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<?php
namespace SilverStripe\View;
use InvalidArgumentException;
use SilverStripe\Core\ClassInfo;
use SilverStripe\Core\Config\Config;
use SilverStripe\Core\Injector\Injector;
use SilverStripe\Core\Object;
/**
* This extends SSViewer_Scope to mix in data on top of what the item provides. This can be "global"
* data that is scope-independant (like BaseURL), or type-specific data that is layered on top cross-cut like
* (like $FirstLast etc).
*
* It's separate from SSViewer_Scope to keep that fairly complex code as clean as possible.
*/
class SSViewer_DataPresenter extends SSViewer_Scope
{
private static $globalProperties = null;
private static $iteratorProperties = null;
/**
* Overlay variables. Take precedence over anything from the current scope
* @var array|null
*/
protected $overlay;
/**
* Underlay variables. Concede precedence to overlay variables or anything from the current scope
* @var array|null
*/
protected $underlay;
public function __construct($item, $overlay = null, $underlay = null, $inheritedScope = null)
{
parent::__construct($item, $inheritedScope);
// Build up global property providers array only once per request
if (self::$globalProperties === null) {
self::$globalProperties = array();
// Get all the exposed variables from all classes that implement the TemplateGlobalProvider interface
$this->createCallableArray(self::$globalProperties, "SilverStripe\\View\\TemplateGlobalProvider",
"get_template_global_variables");
}
// Build up iterator property providers array only once per request
if (self::$iteratorProperties === null) {
self::$iteratorProperties = array();
// Get all the exposed variables from all classes that implement the TemplateIteratorProvider interface
// //call non-statically
$this->createCallableArray(self::$iteratorProperties, "SilverStripe\\View\\TemplateIteratorProvider",
"get_template_iterator_variables", true);
}
$this->overlay = $overlay ? $overlay : array();
$this->underlay = $underlay ? $underlay : array();
}
protected function createCallableArray(&$extraArray, $interfaceToQuery, $variableMethod, $createObject = false)
{
$implementers = ClassInfo::implementorsOf($interfaceToQuery);
if ($implementers) {
foreach ($implementers as $implementer) {
// Create a new instance of the object for method calls
if ($createObject) {
$implementer = new $implementer();
}
// Get the exposed variables
$exposedVariables = call_user_func(array($implementer, $variableMethod));
foreach ($exposedVariables as $varName => $details) {
if (!is_array($details)) {
$details = array(
'method' => $details,
'casting' => Config::inst()->get('SilverStripe\\View\\ViewableData', 'default_cast',
Config::FIRST_SET)
);
}
// If just a value (and not a key => value pair), use it for both key and value
if (is_numeric($varName)) {
$varName = $details['method'];
}
// Add in a reference to the implementing class (might be a string class name or an instance)
$details['implementer'] = $implementer;
// And a callable array
if (isset($details['method'])) {
$details['callable'] = array($implementer, $details['method']);
}
// Save with both uppercase & lowercase first letter, so either works
$lcFirst = strtolower($varName[0]) . substr($varName, 1);
$extraArray[$lcFirst] = $details;
$extraArray[ucfirst($varName)] = $details;
}
}
}
}
/**
* Get the injected value
*
* @param string $property Name of property
* @param array $params
* @param bool $cast If true, an object is always returned even if not an object.
* @return array Result array with the keys 'value' for raw value, or 'obj' if contained in an object
* @throws InvalidArgumentException
*/
public function getInjectedValue($property, $params, $cast = true)
{
$on = $this->itemIterator ? $this->itemIterator->current() : $this->item;
// Find the source of the value
$source = null;
// Check for a presenter-specific override
if (array_key_exists($property, $this->overlay)) {
$source = array('value' => $this->overlay[$property]);
}
// Check if the method to-be-called exists on the target object - if so, don't check any further
// injection locations
else {
if (isset($on->$property) || method_exists($on, $property)) {
$source = null;
} // Check for a presenter-specific override
else {
if (array_key_exists($property, $this->underlay)) {
$source = array('value' => $this->underlay[$property]);
} // Then for iterator-specific overrides
else {
if (array_key_exists($property, self::$iteratorProperties)) {
$source = self::$iteratorProperties[$property];
if ($this->itemIterator) {
// Set the current iterator position and total (the object instance is the first item in
// the callable array)
$source['implementer']->iteratorProperties($this->itemIterator->key(),
$this->itemIteratorTotal);
} else {
// If we don't actually have an iterator at the moment, act like a list of length 1
$source['implementer']->iteratorProperties(0, 1);
}
} // And finally for global overrides
else {
if (array_key_exists($property, self::$globalProperties)) {
$source = self::$globalProperties[$property]; //get the method call
}
}
}
}
}
if ($source) {
$res = array();
// Look up the value - either from a callable, or from a directly provided value
if (isset($source['callable'])) {
$res['value'] = call_user_func_array($source['callable'], $params);
} elseif (isset($source['value'])) {
$res['value'] = $source['value'];
} else {
throw new InvalidArgumentException("Injected property $property does't have a value or callable " .
"value source provided");
}
// If we want to provide a casted object, look up what type object to use
if ($cast) {
// If the handler returns an object, then we don't need to cast.
if (is_object($res['value'])) {
$res['obj'] = $res['value'];
} else {
// Get the object to cast as
$casting = isset($source['casting']) ? $source['casting'] : null;
// If not provided, use default
if (!$casting) {
$casting = Config::inst()->get('SilverStripe\\View\\ViewableData', 'default_cast',
Config::FIRST_SET);
}
$obj = Injector::inst()->get($casting, false, array($property));
$obj->setValue($res['value']);
$res['obj'] = $obj;
}
}
return $res;
}
return null;
}
/**
* Store the current overlay (as it doesn't directly apply to the new scope
* that's being pushed). We want to store the overlay against the next item
* "up" in the stack (hence upIndex), rather than the current item, because
* SSViewer_Scope::obj() has already been called and pushed the new item to
* the stack by this point
* @return SSViewer_Scope
*/
public function pushScope()
{
$scope = parent::pushScope();
$upIndex = $this->getUpIndex();
if ($upIndex !== null) {
$itemStack = $this->getItemStack();
$itemStack[$upIndex][SSViewer_Scope::ITEM_OVERLAY] = $this->overlay;
$this->setItemStack($itemStack);
$this->overlay = array();
}
return $scope;
}
/**
* Now that we're going to jump up an item in the item stack, we need to
* restore the overlay that was previously stored against the next item "up"
* in the stack from the current one
* @return SSViewer_Scope
*/
public function popScope()
{
$upIndex = $this->getUpIndex();
if ($upIndex !== null) {
$itemStack = $this->getItemStack();
$this->overlay = $itemStack[$this->getUpIndex()][SSViewer_Scope::ITEM_OVERLAY];
}
return parent::popScope();
}
/**
* $Up and $Top need to restore the overlay from the parent and top-level
* scope respectively.
*
* @param string $name
* @param array $arguments
* @param bool $cache
* @param string $cacheName
* @return $this
*/
public function obj($name, $arguments = [], $cache = false, $cacheName = null)
{
$overlayIndex = false;
switch ($name) {
case 'Up':
$upIndex = $this->getUpIndex();
if ($upIndex === null) {
user_error('Up called when we\'re already at the top of the scope', E_USER_ERROR);
}
$overlayIndex = $upIndex; // Parent scope
break;
case 'Top':
$overlayIndex = 0; // Top-level scope
break;
}
if ($overlayIndex !== false) {
$itemStack = $this->getItemStack();
if (!$this->overlay && isset($itemStack[$overlayIndex][SSViewer_Scope::ITEM_OVERLAY])) {
$this->overlay = $itemStack[$overlayIndex][SSViewer_Scope::ITEM_OVERLAY];
}
}
return parent::obj($name, $arguments, $cache, $cacheName);
}
public function getObj($name, $arguments = [], $cache = false, $cacheName = null)
{
$result = $this->getInjectedValue($name, (array)$arguments);
if ($result) {
return $result['obj'];
}
return parent::getObj($name, $arguments, $cache, $cacheName);
}
public function __call($name, $arguments)
{
//extract the method name and parameters
$property = $arguments[0]; //the name of the public function being called
//the public function parameters in an array
if (isset($arguments[1]) && $arguments[1] != null) {
$params = $arguments[1];
} else {
$params = array();
}
$val = $this->getInjectedValue($property, $params);
if ($val) {
$obj = $val['obj'];
if ($name === 'hasValue') {
$res = $obj instanceof Object
? $obj->exists()
: (bool)$obj;
} else {
// XML_val
$res = $obj->forTemplate();
}
$this->resetLocalScope();
return $res;
} else {
return parent::__call($name, $arguments);
}
}
}