538 lines
19 KiB
PHP
538 lines
19 KiB
PHP
<?php
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/**
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* The configuration system works like this:
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*
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* Each class has a set of named properties
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*
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* Each named property can contain either
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*
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* - An array
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* - A non-array value
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*
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* If the value is an array, each value in the array may also be one of those three types
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*
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* A property can have a value specified in multiple locations, each of which have a hardcoded or explicit priority.
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* We combine all these values together into a "composite" value using rules that depend on the priority order of the
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* locations to give the final value, using these rules:
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*
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* - If the value is an array, each array is added to the _beginning_ of the composite array in ascending priority
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* order. If a higher priority item has a non-integer key which is the same as a lower priority item, the value of
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* those items is merged using these same rules, and the result of the merge is located in the same location the
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* higher priority item would be if there was no key clash. Other than in this key-clash situation, within the
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* particular array, order is preserved.
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*
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* - If the value is not an array, the highest priority value is used without any attempt to merge
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*
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* It is an error to have mixed types of the same named property in different locations (but an error will not
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* necessarily be raised due to optimisations in the lookup code)
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*
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* The exception to this is "false-ish" values - empty arrays, empty strings, etc. When merging a non-false-ish value
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* with a false-ish value, the result will be the non-false-ish value regardless of priority. When merging two
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* false-ish values the result will be the higher priority false-ish value.
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*
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* The locations that configuration values are taken from in highest -> lowest priority order
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*
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* - Any values set via a call to Config#update
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*
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* - The configuration values taken from the YAML files in _config directories (internally sorted in before / after
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* order, where the item that is latest is highest priority)
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*
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* - Any static set on an "additional static source" class (such as an extension) named the same as the name of the
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* property
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*
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* - Any static set on the class named the same as the name of the property
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*
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* - The composite configuration value of the parent class of this class
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*
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* At some of these levels you can also set masks. These remove values from the composite value at their priority
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* point rather than add. They are much simpler. They consist of a list of key / value pairs. When applied against the
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* current composite value:
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*
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* - If the composite value is a sequential array, any member of that array that matches any value in the mask is
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* removed
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*
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* - If the composite value is an associative array, any member of that array that matches both the key and value of
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* any pair in the mask is removed
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*
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* - If the composite value is not an array, if that value matches any value in the mask it is removed
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*/
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class Config {
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/**
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* [A marker instance for the "anything" singleton value. Don't access directly, even in-class, always use
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* self::anything()
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* @var Object
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*/
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static private $_anything = null;
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/**
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* Get a marker class instance that is used to do a "remove anything with this key" by adding
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* $key => Config::anything() to the suppress array
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*
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* @todo Does this follow the SS coding conventions? Config::get_anything_marker_instance() is a lot less elegant.
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* @return Object
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*/
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static public function anything() {
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if (self::$_anything === null) self::$_anything = new stdClass();
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return self::$_anything;
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}
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// -- Source options bitmask --
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/**
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* source options bitmask value - merge all parent configuration in as lowest priority
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* @const
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*/
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const INHERITED = 0;
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/**
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* source options bitmask value - only get configuration set for this specific class, not any of it's parents
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* @const
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*/
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const UNINHERITED = 1;
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/**
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* source options bitmask value - inherit, but stop on the first class that actually provides a value (event an
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* empty value)
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* @const
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*/
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const FIRST_SET = 2;
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/** @const source options bitmask value - do not use additional statics sources (such as extension) */
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const EXCLUDE_EXTRA_SOURCES = 4;
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// -- get_value_type response enum --
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/**
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* Return flag for get_value_type indicating value is a scalar (or really just not-an-array, at least ATM)
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* @const
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*/
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const ISNT_ARRAY = 1;
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/**
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* Return flag for get_value_type indicating value is an array
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* @const
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*/
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const IS_ARRAY = 2;
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/**
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* Get whether the value is an array or not. Used to be more complicated, but still nice sugar to have an enum
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* to compare and not just a true/false value
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* @param $val any - The value
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* @return int - One of ISNT_ARRAY or IS_ARRAY
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*/
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static protected function get_value_type($val) {
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if (is_array($val)) return self::IS_ARRAY;
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return self::ISNT_ARRAY;
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}
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/**
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* What to do if there's a type mismatch
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* @throws UnexpectedValueException
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*/
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static protected function type_mismatch() {
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throw new UnexpectedValueException('Type mismatch in configuration. All values for a particular property must'
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. ' contain the same type (or no value at all).');
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}
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/* @todo If we can, replace next static & static methods with DI once that's in */
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static protected $instance;
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/**
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* Get the current active Config instance.
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*
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* Configs should not normally be manually created.
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* In general use you will use this method to obtain the current Config instance.
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*
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* @return Config
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*/
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static public function inst() {
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if (!self::$instance) self::$instance = new Config();
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return self::$instance;
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}
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/**
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* Set the current active Config instance.
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*
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* Configs should not normally be manually created.
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* A use case for replacing the active configuration set would be for creating an isolated environment for
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* unit tests
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*
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* @return Config
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*/
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static public function set_instance($instance) {
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self::$instance = $instance;
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global $_SINGLETONS;
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$_SINGLETONS['Config'] = $instance;
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}
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/**
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* Empty construction, otherwise calling singleton('Config') (not the right way to get the current active config
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* instance, but people might) gives an error
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*/
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public function __construct() {
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}
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/** @var [array] - Array of arrays. Each member is an nested array keyed as $class => $name => $value,
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* where value is a config value to treat as the highest priority item */
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protected $overrides = array();
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/** @var [array] - Array of arrays. Each member is an nested array keyed as $class => $name => $value,
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* where value is a config value suppress from any lower priority item */
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protected $suppresses = array();
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/** @var [array] - The list of settings pulled from config files to search through */
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protected $manifests = array();
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/**
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* Add another manifest to the list of config manifests to search through.
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*
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* WARNING: Config manifests to not merge entries, and do not solve before/after rules inter-manifest -
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* instead, the last manifest to be added always wins
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*/
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public function pushConfigManifest(SS_ConfigManifest $manifest) {
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array_unshift($this->manifests, $manifest->yamlConfig);
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// @todo: Do anything with these. They're for caching after config.php has executed
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$this->collectConfigPHPSettings = true;
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$this->configPHPIsSafe = false;
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$manifest->activateConfig();
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$this->collectConfigPHPSettings = false;
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}
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/** @var [Config_ForClass] - The list of Config_ForClass instances, keyed off class */
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static protected $for_class_instances = array();
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/**
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* Get an accessor that returns results by class by default.
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*
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* Shouldn't be overridden, since there might be many Config_ForClass instances already held in the wild. Each
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* Config_ForClass instance asks the current_instance of Config for the actual result, so override that instead
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*
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* @param $class
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* @return Config_ForClass
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*/
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public function forClass($class) {
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if (isset(self::$for_class_instances[$class])) {
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return self::$for_class_instances[$class];
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}
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else {
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return self::$for_class_instances[$class] = new Config_ForClass($class);
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}
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}
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/**
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* Merge a lower priority associative array into an existing higher priority associative array, as per the class
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* docblock rules
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*
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* It is assumed you've already checked that you've got two associative arrays, not scalars or sequential arrays
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*
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* @param $dest array - The existing high priority associative array
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* @param $src array - The low priority associative array to merge in
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*/
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public static function merge_array_low_into_high(&$dest, $src) {
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foreach ($src as $k => $v) {
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if (!$v) {
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continue;
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}
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else if (is_int($k)) {
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$dest[] = $v;
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}
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else if (isset($dest[$k])) {
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$newType = self::get_value_type($v);
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$currentType = self::get_value_type($dest[$k]);
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// Throw error if types don't match
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if ($currentType !== $newType) self::type_mismatch();
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if ($currentType == self::IS_ARRAY) self::merge_array_low_into_high($dest[$k], $v);
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else continue;
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}
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else {
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$dest[$k] = $v;
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}
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}
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}
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/**
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* Merge a higher priority assocative array into an existing lower priority associative array, as per the class
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* docblock rules.
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*
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* Much more expensive that the other way around, as there's no way to insert an associative k/v pair into an
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* array at the top of the array
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*
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* @static
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* @param $dest array - The existing low priority associative array
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* @param $src array - The high priority array to merge in
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*/
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public static function merge_array_high_into_low(&$dest, $src) {
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$res = $src;
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self::merge_array_low_into_high($res, $dest);
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$dest = $res;
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}
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public static function merge_high_into_low(&$result, $value) {
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if (!$value) return;
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$newType = self::get_value_type($value);
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if (!$result) {
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$result = $value;
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}
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else {
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$currentType = self::get_value_type($result);
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if ($currentType !== $newType) self::type_mismatch();
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if ($currentType == self::ISNT_ARRAY) $result = $value;
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else self::merge_array_high_into_low($result, $value);
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}
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}
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public static function merge_low_into_high(&$result, $value, $suppress) {
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$newType = self::get_value_type($value);
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if ($suppress) {
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if ($newType == self::IS_ARRAY) {
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$value = self::filter_array_by_suppress_array($value, $suppress);
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if (!$value) return;
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}
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else {
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if (self::check_value_contained_in_suppress_array($value, $suppress)) return;
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}
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}
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if (!$result) {
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$result = $value;
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}
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else {
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$currentType = self::get_value_type($result);
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if ($currentType !== $newType) self::type_mismatch();
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if ($currentType == self::ISNT_ARRAY) return; // PASS
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else self::merge_array_low_into_high($result, $value);
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}
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}
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public static function check_value_contained_in_suppress_array($v, $suppresses) {
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foreach ($suppresses as $suppress) {
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list($sk, $sv) = $suppress;
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if ($sv === self::anything() || $v == $sv) return true;
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}
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return false;
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}
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static protected function check_key_or_value_contained_in_suppress_array($k, $v, $suppresses) {
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foreach ($suppresses as $suppress) {
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list($sk, $sv) = $suppress;
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if (($sk === self::anything() || $k == $sk) && ($sv === self::anything() || $v == $sv)) return true;
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}
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return false;
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}
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static protected function filter_array_by_suppress_array($array, $suppress) {
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$res = array();
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foreach ($array as $k => $v) {
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$suppressed = self::check_key_or_value_contained_in_suppress_array($k, $v, $suppress);
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if (!$suppressed) {
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if (is_numeric($k)) $res[] = $v;
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else $res[$k] = $v;
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}
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}
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return $res;
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}
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/**
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* Get the config value associated for a given class and property
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*
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* This merges all current sources and overrides together to give final value
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* todo: Currently this is done every time. This function is an inner loop function, so we really need to be
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* caching heavily here.
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*
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* @param $class string - The name of the class to get the value for
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* @param $name string - The property to get the value for
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* @param int $sourceOptions Bitmask which can be set to some combintain of Config::UNINHERITED,
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* Config::FIRST_SET, and Config::EXCLUDE_EXTENSIONS.
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*
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* Config::UNINHERITED does not include parent classes when merging configuration fragments
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* Config::FIRST_SET stops inheriting once the first class that sets a value (even an empty value) is encoutered
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* Config::EXCLUDE_EXTRA_SOURCES does not include any additional static sources (such as extensions)
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*
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* Config::INHERITED is a utility constant that can be used to mean "none of the above", equvilient to 0
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* Setting both Config::UNINHERITED and Config::FIRST_SET behaves the same as just Config::UNINHERITED
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*
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* should the parent classes value be merged in as the lowest priority source?
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* @param $result array|scalar Reference to a variable to put the result in. Also returned, so this can be left
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* as null safely. If you do pass a value, it will be treated as the highest priority
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* value in the result chain
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* @param $suppress array Internal use when called by child classes. Array of mask pairs to filter value by
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* @return array|scalar The value of the config item, or null if no value set. Could be an associative array,
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* sequential array or scalar depending on value (see class docblock)
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*/
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public function get($class, $name, $sourceOptions = 0, &$result = null, $suppress = null) {
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// If result is already not something to merge into, just return it
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if ($result !== null && !is_array($result)) return $result;
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// First, look through the override values
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foreach($this->overrides as $k => $overrides) {
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if (isset($overrides[$class][$name])) {
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$value = $overrides[$class][$name];
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self::merge_low_into_high($result, $value, $suppress);
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if ($result !== null && !is_array($result)) return $result;
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}
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if (isset($this->suppresses[$k][$class][$name])) {
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$suppress = $suppress
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? array_merge($suppress, $this->suppresses[$k][$class][$name])
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: $this->suppresses[$k][$class][$name];
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}
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}
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// Then the manifest values
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foreach($this->manifests as $manifest) {
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if (isset($manifest[$class][$name])) {
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self::merge_low_into_high($result, $manifest[$class][$name], $suppress);
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if ($result !== null && !is_array($result)) return $result;
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}
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}
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// Then look at the static variables
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$nothing = new stdClass();
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$sources = array($class);
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// Include extensions only if not flagged not to, and some have been set
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if (($sourceOptions & self::EXCLUDE_EXTRA_SOURCES) != self::EXCLUDE_EXTRA_SOURCES) {
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$extraSources = Object::get_extra_config_sources($class);
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if ($extraSources) $sources = array_merge($sources, $extraSources);
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}
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foreach ($sources as $staticSource) {
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if (is_array($staticSource)) $value = isset($staticSource[$name]) ? $staticSource[$name] : $nothing;
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else $value = Object::static_lookup($staticSource, $name, $nothing);
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if ($value !== $nothing) {
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self::merge_low_into_high($result, $value, $suppress);
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if ($result !== null && !is_array($result)) return $result;
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}
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}
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// Finally, merge in the values from the parent class
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if (($sourceOptions & self::UNINHERITED) != self::UNINHERITED
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&& (($sourceOptions & self::FIRST_SET) != self::FIRST_SET || $result === null)) {
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$parent = get_parent_class($class);
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if ($parent) $this->get($parent, $name, $sourceOptions, $result, $suppress);
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}
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if ($name == 'routes') {
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print_r($result); die;
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}
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return $result;
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}
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/**
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* Update a configuration value
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*
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* Configuration is modify only. The value passed is merged into the existing configuration. If you want to
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* replace the current value, you'll need to call remove first.
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*
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* @param $class string - The class to update a configuration value for
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* @param $name string - The configuration property name to update
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* @param $value any - The value to update with
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*
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* Arrays are recursively merged into current configuration as "latest" - for associative arrays the passed value
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* replaces any item with the same key, for sequential arrays the items are placed at the end of the array, for
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* non-array values, this value replaces any existing value
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*
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* You will get an error if you try and override array values with non-array values or vice-versa
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*/
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public function update($class, $name, $val) {
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if (!isset($this->overrides[0][$class])) $this->overrides[0][$class] = array();
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if (!isset($this->overrides[0][$class][$name])) $this->overrides[0][$class][$name] = $val;
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else self::merge_high_into_low($this->overrides[0][$class][$name], $val);
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}
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/**
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* Remove a configuration value
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*
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* You can specify a key, a key and a value, or neither. Either argument can be Config::anything(), which is
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* what is defaulted to if you don't specify something
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*
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* This removes any current configuration value that matches the key and/or value specified
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*
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* Works like this:
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* - Check the current override array, and remove any values that match the arguments provided
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* - Keeps track of the arguments passed to this method, and in get filters everything _except_ the current
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* override array to exclude any match
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*
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* This way we can re-set anything removed by a call to this function by calling set. Because the current override
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* array is only filtered immediately on calling this remove method, that value will then be exposed. However,
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* every other source is filtered on request, so no amount of changes to parent's configuration etc can override a
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* remove call.
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*
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* @param $class string - The class to remove a configuration value from
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* @param $name string - The configuration name
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* @param $key any - An optional key to filter against.
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* If referenced config value is an array, only members of that array that match this key will be removed
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* Must also match value if provided to be removed
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* @param $value any - And optional value to filter against.
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* If referenced config value is an array, only members of that array that match this value will be removed
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* If referenced config value is not an array, value will be removed only if it matches this argument
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* Must also match key if provided and referenced config value is an array to be removed
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*
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* Matching is always by "==", not by "==="
|
|
*/
|
|
public function remove($class, $name) {
|
|
$argc = func_num_args();
|
|
$key = $argc > 2 ? func_get_arg(2) : self::anything();
|
|
$value = $argc > 3 ? func_get_arg(3) : self::anything();
|
|
|
|
$suppress = array($key, $value);
|
|
|
|
if (isset($this->overrides[0][$class][$name])) {
|
|
$value = $this->overrides[0][$class][$name];
|
|
|
|
if (is_array($value)) {
|
|
$this->overrides[0][$class][$name] = self::filter_array_by_suppress_array($value, array($suppress));
|
|
}
|
|
else {
|
|
if (self::check_value_contained_in_suppress_array($value, array($suppress))) {
|
|
unset($this->overrides[0][$class][$name]);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!isset($this->suppresses[0][$class])) $this->suppresses[0][$class] = array();
|
|
if (!isset($this->suppresses[0][$class][$name])) $this->suppresses[0][$class][$name] = array();
|
|
|
|
$this->suppresses[0][$class][$name][] = $suppress;
|
|
}
|
|
|
|
}
|
|
|
|
class Config_ForClass {
|
|
protected $class;
|
|
|
|
public function __construct($class) {
|
|
$this->class = $class;
|
|
}
|
|
|
|
public function __get($name) {
|
|
return Config::inst()->get($this->class, $name);
|
|
}
|
|
|
|
public function __set($name, $val) {
|
|
return Config::inst()->update($this->class, $name, $val);
|
|
}
|
|
|
|
public function get($name, $sourceOptions = 0) {
|
|
return Config::inst()->get($this->class, $name, $sourceOptions);
|
|
}
|
|
|
|
public function forClass($class) {
|
|
return Config::inst()->forClass($class);
|
|
}
|
|
}
|