mirror of
https://github.com/silverstripe/silverstripe-framework
synced 2024-06-18 02:31:36 +02:00
303 lines
9.2 KiB
PHP
Executable File
303 lines
9.2 KiB
PHP
Executable File
<?php
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namespace SilverStripe\Core;
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use SilverStripe\Core\Injector\Injectable;
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use SilverStripe\Core\Config\Configurable;
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use Exception;
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use ReflectionClass;
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/**
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* A base class for all SilverStripe objects to inherit from.
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*
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* This class provides a number of pattern implementations, as well as methods and fixes to add extra psuedo-static
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* and method functionality to PHP.
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*
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* See {@link Extension} on how to implement a custom multiple
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* inheritance for object instances based on PHP5 method call overloading.
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*
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* @todo Create instance-specific removeExtension() which removes an extension from $extension_instances,
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* but not from static $extensions, and clears everything added through defineMethods(), mainly $extra_methods.
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*/
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abstract class Object {
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use Extensible;
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use Injectable;
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use Configurable;
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/**
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* @var string the class name
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*/
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public $class;
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private static $_cache_inst_args = array();
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/**
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* Create an object from a string representation. It treats it as a PHP constructor without the
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* 'new' keyword. It also manages to construct the object without the use of eval().
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*
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* Construction itself is done with Object::create(), so that Object::useCustomClass() calls
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* are respected.
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*
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* `Object::create_from_string("Versioned('Stage','Live')")` will return the result of
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* `Versioned::create('Stage', 'Live);`
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*
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* It is designed for simple, cloneable objects. The first time this method is called for a given
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* string it is cached, and clones of that object are returned.
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*
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* If you pass the $firstArg argument, this will be prepended to the constructor arguments. It's
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* impossible to pass null as the firstArg argument.
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*
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* `Object::create_from_string("Varchar(50)", "MyField")` will return the result of
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* `Varchar::create('MyField', '50');`
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*
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* Arguments are always strings, although this is a quirk of the current implementation rather
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* than something that can be relied upon.
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*
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* @param string $classSpec
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* @param mixed $firstArg
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* @return object
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*/
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public static function create_from_string($classSpec, $firstArg = null) {
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if(!isset(self::$_cache_inst_args[$classSpec.$firstArg])) {
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// an $extension value can contain parameters as a string,
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// e.g. "Versioned('Stage','Live')"
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if(strpos($classSpec,'(') === false) {
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if($firstArg === null) {
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self::$_cache_inst_args[$classSpec.$firstArg] = Object::create($classSpec);
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} else {
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self::$_cache_inst_args[$classSpec.$firstArg] = Object::create($classSpec, $firstArg);
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}
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} else {
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list($class, $args) = self::parse_class_spec($classSpec);
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if($firstArg !== null) {
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array_unshift($args, $firstArg);
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}
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array_unshift($args, $class);
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self::$_cache_inst_args[$classSpec.$firstArg] = call_user_func_array(array('SilverStripe\\Core\\Object','create'), $args);
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}
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}
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return clone self::$_cache_inst_args[$classSpec.$firstArg];
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}
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/**
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* Parses a class-spec, such as "Versioned('Stage','Live')", as passed to create_from_string().
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* Returns a 2-element array, with classname and arguments
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*
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* @param string $classSpec
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* @return array
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* @throws Exception
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*/
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public static function parse_class_spec($classSpec) {
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$tokens = token_get_all("<?php $classSpec");
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$class = null;
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$args = array();
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// Keep track of the current bucket that we're putting data into
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$bucket = &$args;
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$bucketStack = array();
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$hadNamespace = false;
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$currentKey = null;
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foreach($tokens as $token) {
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// $forceResult used to allow null result to be detected
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$result = $forceResult = null;
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$tokenName = is_array($token) ? $token[0] : $token;
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// Get the class name
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if($class === null && is_array($token) && $token[0] === T_STRING) {
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$class = $token[1];
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} elseif(is_array($token) && $token[0] === T_NS_SEPARATOR) {
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$class .= $token[1];
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$hadNamespace = true;
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} elseif($hadNamespace && is_array($token) && $token[0] === T_STRING) {
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$class .= $token[1];
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$hadNamespace = false;
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// Get arguments
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} else if(is_array($token)) {
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switch($token[0]) {
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case T_CONSTANT_ENCAPSED_STRING:
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$argString = $token[1];
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switch($argString[0]) {
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case '"':
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$result = stripcslashes(substr($argString,1,-1));
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break;
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case "'":
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$result = str_replace(array("\\\\", "\\'"),array("\\", "'"), substr($argString,1,-1));
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break;
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default:
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throw new Exception("Bad T_CONSTANT_ENCAPSED_STRING arg $argString");
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}
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break;
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case T_DNUMBER:
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$result = (double)$token[1];
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break;
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case T_LNUMBER:
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$result = (int)$token[1];
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break;
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case T_DOUBLE_ARROW:
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// We've encountered an associative array (the array itself has already been
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// added to the bucket), so the previous item added to the bucket is the key
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end($bucket);
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$currentKey = current($bucket);
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array_pop($bucket);
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break;
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case T_STRING:
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switch($token[1]) {
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case 'true': $result = true; break;
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case 'false': $result = false; break;
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case 'null': $result = null; $forceResult = true; break;
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default: throw new Exception("Bad T_STRING arg '{$token[1]}'");
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}
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break;
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case T_ARRAY:
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$result = array();
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break;
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}
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} else {
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if($tokenName === '[') {
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$result = array();
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} elseif(($tokenName === ')' || $tokenName === ']') && ! empty($bucketStack)) {
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// Store the bucket we're currently working on
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$oldBucket = $bucket;
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// Fetch the key for the bucket at the top of the stack
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end($bucketStack);
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$key = key($bucketStack);
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reset($bucketStack);
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// Re-instate the bucket from the top of the stack
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$bucket = &$bucketStack[$key];
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// Add our saved, "nested" bucket to the bucket we just popped off the stack
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$bucket[$key] = $oldBucket;
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// Remove the bucket we just popped off the stack
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array_pop($bucketStack);
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}
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}
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// If we've got something to add to the bucket, add it
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if($result !== null || $forceResult) {
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if($currentKey) {
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$bucket[$currentKey] = $result;
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$currentKey = null;
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} else {
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$bucket[] = $result;
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}
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// If we've just pushed an array, that becomes our new bucket
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if($result === array()) {
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// Fetch the key that the array was pushed to
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end($bucket);
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$key = key($bucket);
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reset($bucket);
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// Store reference to "old" bucket in the stack
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$bucketStack[$key] = &$bucket;
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// Set the active bucket to be our newly-pushed, empty array
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$bucket = &$bucket[$key];
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}
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}
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}
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return array($class, $args);
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}
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/**
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* Get the value of a static property of a class, even in that property is declared protected (but not private),
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* without any inheritance, merging or parent lookup if it doesn't exist on the given class.
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*
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* @param string $class The class to get the static from
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* @param string $name The property to get from the class
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* @param mixed $default The value to return if property doesn't exist on class
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* @return mixed The value of the static property $name on class $class,
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* or $default if that property is not defined
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*/
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public static function static_lookup($class, $name, $default = null) {
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if (is_subclass_of($class, 'SilverStripe\\Core\\Object')) {
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if (isset($class::$$name)) {
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$parent = get_parent_class($class);
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if (!$parent || !isset($parent::$$name) || $parent::$$name !== $class::$$name) return $class::$$name;
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}
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return $default;
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} else {
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// TODO: This gets set once, then not updated, so any changes to statics after this is called the first
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// time for any class won't be exposed
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static $static_properties = array();
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if (!isset($static_properties[$class])) {
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$reflection = new ReflectionClass($class);
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$static_properties[$class] = $reflection->getStaticProperties();
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}
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if (isset($static_properties[$class][$name])) {
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$value = $static_properties[$class][$name];
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$parent = get_parent_class($class);
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if (!$parent) return $value;
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if (!isset($static_properties[$parent])) {
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$reflection = new ReflectionClass($parent);
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$static_properties[$parent] = $reflection->getStaticProperties();
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}
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if (!isset($static_properties[$parent][$name]) || $static_properties[$parent][$name] !== $value) {
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return $value;
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}
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}
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}
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return $default;
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}
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public function __construct() {
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$this->class = get_class($this);
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$this->constructExtensions();
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}
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// --------------------------------------------------------------------------------------------------------------
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/**
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* Return true if this object "exists" i.e. has a sensible value
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*
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* This method should be overriden in subclasses to provide more context about the classes state. For example, a
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* {@link DataObject} class could return false when it is deleted from the database
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*
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* @return bool
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*/
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public function exists() {
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return true;
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}
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/**
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* @return string this classes parent class
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*/
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public function parentClass() {
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return get_parent_class($this);
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}
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/**
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* Check if this class is an instance of a specific class, or has that class as one of its parents
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*
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* @param string $class
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* @return bool
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*/
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public function is_a($class) {
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return $this instanceof $class;
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}
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/**
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* @return string the class name
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*/
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public function __toString() {
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return $this->class;
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}
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}
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