250 lines
8.0 KiB
PHP
250 lines
8.0 KiB
PHP
<?php
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namespace SilverStripe\Dev;
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use SilverStripe\Control\Director;
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use SilverStripe\Core\Manifest\ClassLoader;
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/**
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* Handles raising an notice when accessing a deprecated method
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*
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* A pattern used in SilverStripe when deprecating a method is to add something like
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* user_error('This method is deprecated', E_USER_NOTICE);
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* to the method
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*
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* However sometimes we want to mark that a method will be deprecated in some future version and shouldn't be used in
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* new code, but not forbid in the current version - for instance when that method is still heavily used in framework
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* or cms.
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*
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* This class abstracts the above pattern and adds a way to do that.
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*
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* Each call to notice passes a version that the notice will be valid from. Additionally this class has a notion of the
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* version it should use when deciding whether to raise the notice. If that version is equal to or greater than the
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* notices version (and SilverStripe is in dev mode) a deprecation message will be raised.
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*
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* Normally the checking version will be the release version of SilverStripe, but a developer can choose to set it to a
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* future version, to see how their code will behave in future versions.
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*
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* Modules can also set the version for calls they make - either setting it to a future version in order to ensure
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* forwards compatibility or setting it backwards if a module has not yet removed references to deprecated methods.
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*
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* When set per-module, only direct calls to deprecated methods from those modules are considered - if the module
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* calls a non-module method which then calls a deprecated method, that call will use the global check version, not
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* the module specific check version.
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*/
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class Deprecation {
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const SCOPE_METHOD = 1;
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const SCOPE_CLASS = 2;
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const SCOPE_GLOBAL = 4;
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/**
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*
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* @var string
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*/
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protected static $version;
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/**
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* Override whether deprecation is enabled. If null, then fallback to
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* SS_DEPRECATION_ENABLED, and then true if not defined.
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*
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* Deprecation is only available on dev.
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*
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* Must be configured outside of the config API, as deprecation API
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* must be available before this to avoid infinite loops.
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*
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* @var boolean|null
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*/
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protected static $enabled = null;
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/**
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*
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* @var array
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*/
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protected static $module_version_overrides = array();
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/**
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* @var int - the notice level to raise on a deprecation notice. Defaults to E_USER_DEPRECATED if that exists,
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* E_USER_NOTICE if not
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*/
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public static $notice_level = null;
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/**
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* Set the version that is used to check against the version passed to notice. If the ::notice version is
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* greater than or equal to this version, a message will be raised
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*
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* @static
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* @param $ver string -
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* A php standard version string, see http://php.net/manual/en/function.version-compare.php for details.
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* @param null $forModule string -
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* The name of a module. The passed version will be used as the check value for
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* calls directly from this module rather than the global value
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* @return void
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*/
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public static function notification_version($ver, $forModule = null) {
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if ($forModule) {
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self::$module_version_overrides[$forModule] = $ver;
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}
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else {
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self::$version = $ver;
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}
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}
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/**
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* Given a backtrace, get the module name from the caller two removed (the caller of the method that called
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* #notice)
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*
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* @param array $backtrace A backtrace as returned from debug_backtrace
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* @return string The name of the module the call came from, or null if we can't determine
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*/
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protected static function get_calling_module_from_trace($backtrace) {
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if (!isset($backtrace[1]['file'])) {
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return null;
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}
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$callingfile = realpath($backtrace[1]['file']);
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$manifest = ClassLoader::instance()->getManifest();
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foreach ($manifest->getModules() as $name => $path) {
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if (strpos($callingfile, realpath($path)) === 0) {
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return $name;
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}
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}
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return null;
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}
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/**
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* Given a backtrace, get the method name from the immediate parent caller (the caller of #notice)
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*
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* @static
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* @param $backtrace array - a backtrace as returned from debug_backtrace
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* @param $level - 1 (default) will return immediate caller, 2 will return caller's caller, etc.
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* @return string - the name of the method
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*/
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protected static function get_called_method_from_trace($backtrace, $level = 1) {
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$level = (int)$level;
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if(!$level) $level = 1;
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$called = $backtrace[$level];
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if (isset($called['class'])) {
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return $called['class'] . $called['type'] . $called['function'];
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}
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else {
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return $called['function'];
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}
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}
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/**
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* Determine if deprecation notices should be displayed
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*
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* @return bool
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*/
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public static function get_enabled() {
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// Deprecation is only available on dev
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if(!Director::isDev()) {
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return false;
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}
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if(isset(self::$enabled)) {
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return self::$enabled;
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}
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if(defined('SS_DEPRECATION_ENABLED')) {
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return SS_DEPRECATION_ENABLED;
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}
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return true;
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}
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/**
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* Toggle on or off deprecation notices. Will be ignored in live.
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*
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* @param bool $enabled
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*/
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public static function set_enabled($enabled) {
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self::$enabled = $enabled;
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}
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/**
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* Raise a notice indicating the method is deprecated if the version passed as the second argument is greater
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* than or equal to the check version set via ::notification_version
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*
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* @param string $atVersion The version at which this notice should start being raised
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* @param string $string The notice to raise
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* @param int $scope Notice relates to the method or class context its called in.
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*/
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public static function notice($atVersion, $string = '', $scope = Deprecation::SCOPE_METHOD) {
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if(!static::get_enabled()) {
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return;
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}
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$checkVersion = self::$version;
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// Getting a backtrace is slow, so we only do it if we need it
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$backtrace = null;
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// If you pass #.#, assume #.#.0
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if(preg_match('/^[0-9]+\.[0-9]+$/', $atVersion)) $atVersion .= '.0';
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if(preg_match('/^[0-9]+\.[0-9]+$/', $checkVersion)) $checkVersion .= '.0';
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if(self::$module_version_overrides) {
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$module = self::get_calling_module_from_trace($backtrace = debug_backtrace(0));
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if(isset(self::$module_version_overrides[$module])) {
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$checkVersion = self::$module_version_overrides[$module];
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}
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}
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// Check the version against the notice version
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if ($checkVersion && version_compare($checkVersion, $atVersion, '>=')) {
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// Get the calling scope
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if($scope == Deprecation::SCOPE_METHOD) {
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if (!$backtrace) $backtrace = debug_backtrace(0);
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$caller = self::get_called_method_from_trace($backtrace);
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} elseif($scope == Deprecation::SCOPE_CLASS) {
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if (!$backtrace) $backtrace = debug_backtrace(0);
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$caller = isset($backtrace[1]['class']) ? $backtrace[1]['class'] : '(unknown)';
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} else {
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$caller = false;
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}
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// Get the level to raise the notice as
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$level = self::$notice_level;
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if (!$level) $level = E_USER_DEPRECATED;
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// Then raise the notice
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if(substr($string,-1) != '.') $string .= ".";
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$string .= " Called from " . self::get_called_method_from_trace($backtrace, 2) . '.';
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if($caller) {
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user_error($caller.' is deprecated.'.($string ? ' '.$string : ''), $level);
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} else {
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user_error($string, $level);
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}
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}
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}
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/**
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* Method for when testing. Dump all the current version settings to a variable for later passing to restore
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*
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* @return array Opaque array that should only be used to pass to {@see Deprecation::restore_settings()}
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*/
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public static function dump_settings() {
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return array(
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'level' => self::$notice_level,
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'version' => self::$version,
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'moduleVersions' => self::$module_version_overrides,
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'enabled' => self::$enabled,
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);
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}
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/**
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* Method for when testing. Restore all the current version settings from a variable
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*
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* @param $settings array An array as returned by {@see Deprecation::dump_settings()}
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*/
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public static function restore_settings($settings) {
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self::$notice_level = $settings['level'];
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self::$version = $settings['version'];
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self::$module_version_overrides = $settings['moduleVersions'];
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self::$enabled = $settings['enabled'];
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}
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}
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