mirror of
https://github.com/silverstripe/silverstripe-framework
synced 2024-06-17 18:21:44 +02:00
0c41a97a8b
API Add HasRequestHandler interface API Refactor Link() and url handling behaviour from Controller into RequestHandler API RequestHandler classes now must define url_segment to have a default Link() API Clean up redirectBack()
598 lines
18 KiB
PHP
598 lines
18 KiB
PHP
<?php
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namespace SilverStripe\View;
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use SilverStripe\Core\Object;
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use SilverStripe\ORM\ArrayLib;
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use SilverStripe\ORM\FieldType\DBField;
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use SilverStripe\ORM\FieldType\DBHTMLText;
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use SilverStripe\Core\ClassInfo;
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use SilverStripe\Core\Convert;
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use SilverStripe\Core\Injector\Injector;
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use SilverStripe\Dev\Debug;
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use IteratorAggregate;
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use LogicException;
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use InvalidArgumentException;
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use UnexpectedValueException;
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use ArrayIterator;
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/**
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* A ViewableData object is any object that can be rendered into a template/view.
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*
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* A view interrogates the object being currently rendered in order to get data to render into the template. This data
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* is provided and automatically escaped by ViewableData. Any class that needs to be available to a view (controllers,
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* {@link DataObject}s, page controls) should inherit from this class.
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*/
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class ViewableData extends Object implements IteratorAggregate
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{
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/**
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* An array of objects to cast certain fields to. This is set up as an array in the format:
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*
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* <code>
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* public static $casting = array (
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* 'FieldName' => 'ClassToCastTo(Arguments)'
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* );
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* </code>
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*
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* @var array
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* @config
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*/
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private static $casting = array(
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'CSSClasses' => 'Varchar'
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);
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/**
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* The default object to cast scalar fields to if casting information is not specified, and casting to an object
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* is required.
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*
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* @var string
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* @config
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*/
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private static $default_cast = 'Text';
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/**
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* @var array
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*/
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private static $casting_cache = array();
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// -----------------------------------------------------------------------------------------------------------------
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/**
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* A failover object to attempt to get data from if it is not present on this object.
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*
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* @var ViewableData
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*/
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protected $failover;
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/**
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* @var ViewableData
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*/
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protected $customisedObject;
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/**
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* @var array
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*/
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private $objCache = array();
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// -----------------------------------------------------------------------------------------------------------------
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// FIELD GETTERS & SETTERS -----------------------------------------------------------------------------------------
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/**
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* Check if a field exists on this object or its failover.
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* Note that, unlike the core isset() implementation, this will return true if the property is defined
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* and set to null.
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*
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* @param string $property
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* @return bool
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*/
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public function __isset($property)
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{
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// getField() isn't a field-specific getter and shouldn't be treated as such
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if (strtolower($property) !== 'field' && $this->hasMethod($method = "get$property")) {
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return true;
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} elseif ($this->hasField($property)) {
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return true;
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} elseif ($this->failover) {
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return isset($this->failover->$property);
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}
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return false;
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}
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/**
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* Get the value of a property/field on this object. This will check if a method called get{$property} exists, then
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* check if a field is available using {@link ViewableData::getField()}, then fall back on a failover object.
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*
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* @param string $property
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* @return mixed
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*/
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public function __get($property)
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{
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// getField() isn't a field-specific getter and shouldn't be treated as such
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if (strtolower($property) !== 'field' && $this->hasMethod($method = "get$property")) {
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return $this->$method();
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} elseif ($this->hasField($property)) {
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return $this->getField($property);
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} elseif ($this->failover) {
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return $this->failover->$property;
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}
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return null;
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}
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/**
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* Set a property/field on this object. This will check for the existence of a method called set{$property}, then
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* use the {@link ViewableData::setField()} method.
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*
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* @param string $property
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* @param mixed $value
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*/
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public function __set($property, $value)
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{
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$this->objCacheClear();
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if ($this->hasMethod($method = "set$property")) {
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$this->$method($value);
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} else {
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$this->setField($property, $value);
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}
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}
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/**
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* Set a failover object to attempt to get data from if it is not present on this object.
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*
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* @param ViewableData $failover
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*/
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public function setFailover(ViewableData $failover)
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{
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// Ensure cached methods from previous failover are removed
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if ($this->failover) {
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$this->removeMethodsFrom('failover');
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}
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$this->failover = $failover;
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$this->defineMethods();
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}
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/**
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* Get the current failover object if set
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*
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* @return ViewableData|null
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*/
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public function getFailover()
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{
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return $this->failover;
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}
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/**
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* Check if a field exists on this object. This should be overloaded in child classes.
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*
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* @param string $field
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* @return bool
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*/
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public function hasField($field)
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{
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return property_exists($this, $field);
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}
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/**
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* Get the value of a field on this object. This should be overloaded in child classes.
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*
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* @param string $field
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* @return mixed
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*/
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public function getField($field)
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{
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return $this->$field;
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}
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/**
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* Set a field on this object. This should be overloaded in child classes.
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*
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* @param string $field
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* @param mixed $value
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* @return $this
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*/
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public function setField($field, $value)
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{
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$this->objCacheClear();
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$this->$field = $value;
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return $this;
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}
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// -----------------------------------------------------------------------------------------------------------------
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/**
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* Add methods from the {@link ViewableData::$failover} object, as well as wrapping any methods prefixed with an
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* underscore into a {@link ViewableData::cachedCall()}.
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*
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* @throws LogicException
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*/
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public function defineMethods()
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{
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if ($this->failover && !is_object($this->failover)) {
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throw new LogicException("ViewableData::\$failover set to a non-object");
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}
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if ($this->failover) {
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$this->addMethodsFrom('failover');
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if (isset($_REQUEST['debugfailover'])) {
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Debug::message("$this->class created with a failover class of {$this->failover->class}");
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}
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}
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parent::defineMethods();
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}
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/**
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* Merge some arbitrary data in with this object. This method returns a {@link ViewableData_Customised} instance
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* with references to both this and the new custom data.
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*
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* Note that any fields you specify will take precedence over the fields on this object.
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*
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* @param array|ViewableData $data
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* @return ViewableData_Customised
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*/
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public function customise($data)
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{
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if (is_array($data) && (empty($data) || ArrayLib::is_associative($data))) {
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$data = new ArrayData($data);
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}
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if ($data instanceof ViewableData) {
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return new ViewableData_Customised($this, $data);
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}
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throw new InvalidArgumentException(
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'ViewableData->customise(): $data must be an associative array or a ViewableData instance'
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);
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}
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/**
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* @return ViewableData
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*/
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public function getCustomisedObj()
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{
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return $this->customisedObject;
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}
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/**
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* @param ViewableData $object
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*/
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public function setCustomisedObj(ViewableData $object)
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{
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$this->customisedObject = $object;
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}
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// CASTING ---------------------------------------------------------------------------------------------------------
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/**
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* Return the "casting helper" (a piece of PHP code that when evaluated creates a casted value object)
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* for a field on this object. This helper will be a subclass of DBField.
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*
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* @param string $field
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* @return string Casting helper As a constructor pattern, and may include arguments.
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*/
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public function castingHelper($field)
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{
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$specs = $this->config()->get('casting');
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if (isset($specs[$field])) {
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return $specs[$field];
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}
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// If no specific cast is declared, fall back to failover.
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// Note that if there is a failover, the default_cast will always
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// be drawn from this object instead of the top level object.
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$failover = $this->getFailover();
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if ($failover) {
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$cast = $failover->castingHelper($field);
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if ($cast) {
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return $cast;
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}
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}
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// Fall back to default_cast
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$default = $this->config()->get('default_cast');
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if (empty($default)) {
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throw new \Exception("No default_cast");
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}
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return $default;
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}
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/**
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* Get the class name a field on this object will be casted to.
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*
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* @param string $field
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* @return string
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*/
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public function castingClass($field)
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{
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// Strip arguments
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$spec = $this->castingHelper($field);
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return trim(strtok($spec, '('));
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}
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/**
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* Return the string-format type for the given field.
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*
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* @param string $field
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* @return string 'xml'|'raw'
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*/
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public function escapeTypeForField($field)
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{
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$class = $this->castingClass($field) ?: $this->config()->get('default_cast');
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// TODO: It would be quicker not to instantiate the object, but to merely
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// get its class from the Injector
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/** @var DBField $type */
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$type = Injector::inst()->get($class, true);
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return $type->config()->get('escape_type');
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}
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// TEMPLATE ACCESS LAYER -------------------------------------------------------------------------------------------
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/**
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* Render this object into the template, and get the result as a string. You can pass one of the following as the
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* $template parameter:
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* - a template name (e.g. Page)
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* - an array of possible template names - the first valid one will be used
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* - an SSViewer instance
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*
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* @param string|array|SSViewer $template the template to render into
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* @param array $customFields fields to customise() the object with before rendering
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* @return DBHTMLText
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*/
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public function renderWith($template, $customFields = null)
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{
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if (!is_object($template)) {
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$template = new SSViewer($template);
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}
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$data = ($this->customisedObject) ? $this->customisedObject : $this;
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if ($customFields instanceof ViewableData) {
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$data = $data->customise($customFields);
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}
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if ($template instanceof SSViewer) {
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return $template->process($data, is_array($customFields) ? $customFields : null);
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}
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throw new UnexpectedValueException(
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"ViewableData::renderWith(): unexpected ".get_class($template)." object, expected an SSViewer instance"
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);
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}
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/**
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* Generate the cache name for a field
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*
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* @param string $fieldName Name of field
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* @param array $arguments List of optional arguments given
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* @return string
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*/
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protected function objCacheName($fieldName, $arguments)
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{
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return $arguments
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? $fieldName . ":" . implode(',', $arguments)
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: $fieldName;
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}
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/**
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* Get a cached value from the field cache
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*
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* @param string $key Cache key
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* @return mixed
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*/
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protected function objCacheGet($key)
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{
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if (isset($this->objCache[$key])) {
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return $this->objCache[$key];
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}
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return null;
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}
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/**
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* Store a value in the field cache
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*
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* @param string $key Cache key
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* @param mixed $value
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* @return $this
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*/
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protected function objCacheSet($key, $value)
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{
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$this->objCache[$key] = $value;
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return $this;
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}
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/**
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* Clear object cache
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*
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* @return $this
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*/
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protected function objCacheClear()
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{
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$this->objCache = [];
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return $this;
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}
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/**
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* Get the value of a field on this object, automatically inserting the value into any available casting objects
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* that have been specified.
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*
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* @param string $fieldName
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* @param array $arguments
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* @param bool $cache Cache this object
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* @param string $cacheName a custom cache name
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* @return Object|DBField
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*/
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public function obj($fieldName, $arguments = [], $cache = false, $cacheName = null)
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{
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if (!$cacheName && $cache) {
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$cacheName = $this->objCacheName($fieldName, $arguments);
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}
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// Check pre-cached value
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$value = $cache ? $this->objCacheGet($cacheName) : null;
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if ($value !== null) {
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return $value;
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}
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// Load value from record
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if ($this->hasMethod($fieldName)) {
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$value = call_user_func_array(array($this, $fieldName), $arguments ?: []);
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} else {
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$value = $this->$fieldName;
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}
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// Cast object
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if (!is_object($value)) {
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// Force cast
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$castingHelper = $this->castingHelper($fieldName);
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$valueObject = Object::create_from_string($castingHelper, $fieldName);
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$valueObject->setValue($value, $this);
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$value = $valueObject;
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}
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// Record in cache
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if ($cache) {
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$this->objCacheSet($cacheName, $value);
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}
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return $value;
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}
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/**
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* A simple wrapper around {@link ViewableData::obj()} that automatically caches the result so it can be used again
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* without re-running the method.
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*
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* @param string $field
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* @param array $arguments
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* @param string $identifier an optional custom cache identifier
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* @return Object|DBField
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*/
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public function cachedCall($field, $arguments = [], $identifier = null)
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{
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return $this->obj($field, $arguments, true, $identifier);
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}
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/**
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* Checks if a given method/field has a valid value. If the result is an object, this will return the result of the
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* exists method, otherwise will check if the result is not just an empty paragraph tag.
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*
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* @param string $field
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* @param array $arguments
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* @param bool $cache
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* @return bool
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*/
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public function hasValue($field, $arguments = [], $cache = true)
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{
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$result = $this->obj($field, $arguments, $cache);
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return $result->exists();
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}
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/**
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* Get the string value of a field on this object that has been suitable escaped to be inserted directly into a
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* template.
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*
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* @param string $field
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* @param array $arguments
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* @param bool $cache
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* @return string
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*/
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public function XML_val($field, $arguments = [], $cache = false)
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{
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$result = $this->obj($field, $arguments, $cache);
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// Might contain additional formatting over ->XML(). E.g. parse shortcodes, nl2br()
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return $result->forTemplate();
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}
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/**
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* Get an array of XML-escaped values by field name
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*
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* @param array $fields an array of field names
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* @return array
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*/
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public function getXMLValues($fields)
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{
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$result = array();
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foreach ($fields as $field) {
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$result[$field] = $this->XML_val($field);
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}
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return $result;
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}
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// ITERATOR SUPPORT ------------------------------------------------------------------------------------------------
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/**
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* Return a single-item iterator so you can iterate over the fields of a single record.
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*
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* This is useful so you can use a single record inside a <% control %> block in a template - and then use
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* to access individual fields on this object.
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*
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* @return ArrayIterator
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*/
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public function getIterator()
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{
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return new ArrayIterator(array($this));
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}
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// UTILITY METHODS -------------------------------------------------------------------------------------------------
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/**
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* When rendering some objects it is necessary to iterate over the object being rendered, to do this, you need
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* access to itself.
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*
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* @return ViewableData
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*/
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public function Me()
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{
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return $this;
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}
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/**
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* Get part of the current classes ancestry to be used as a CSS class.
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*
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* This method returns an escaped string of CSS classes representing the current classes ancestry until it hits a
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* stop point - e.g. "Page DataObject ViewableData".
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*
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* @param string $stopAtClass the class to stop at (default: ViewableData)
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* @return string
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* @uses ClassInfo
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*/
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public function CSSClasses($stopAtClass = self::class)
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{
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$classes = array();
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$classAncestry = array_reverse(ClassInfo::ancestry($this->class));
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$stopClasses = ClassInfo::ancestry($stopAtClass);
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foreach ($classAncestry as $class) {
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if (in_array($class, $stopClasses)) {
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break;
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}
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$classes[] = $class;
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}
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// optionally add template identifier
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if (isset($this->template) && !in_array($this->template, $classes)) {
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$classes[] = $this->template;
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}
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// Strip out namespaces
|
|
$classes = preg_replace('#.*\\\\#', '', $classes);
|
|
|
|
return Convert::raw2att(implode(' ', $classes));
|
|
}
|
|
|
|
/**
|
|
* Return debug information about this object that can be rendered into a template
|
|
*
|
|
* @return ViewableData_Debugger
|
|
*/
|
|
public function Debug()
|
|
{
|
|
return new ViewableData_Debugger($this);
|
|
}
|
|
}
|