mirror of
https://github.com/WordPress/WordPress.git
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aaf99e6913
WordPress' code just... wasn't. This is now dealt with. Props jrf, pento, netweb, GaryJ, jdgrimes, westonruter, Greg Sherwood from PHPCS, and everyone who's ever contributed to WPCS and PHPCS. Fixes #41057. Built from https://develop.svn.wordpress.org/trunk@42343 git-svn-id: http://core.svn.wordpress.org/trunk@42172 1a063a9b-81f0-0310-95a4-ce76da25c4cd
511 lines
14 KiB
PHP
511 lines
14 KiB
PHP
<?php
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/**
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* Plugin API: WP_Hook class
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*
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* @package WordPress
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* @subpackage Plugin
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* @since 4.7.0
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*/
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/**
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* Core class used to implement action and filter hook functionality.
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*
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* @since 4.7.0
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*
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* @see Iterator
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* @see ArrayAccess
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*/
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final class WP_Hook implements Iterator, ArrayAccess {
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/**
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* Hook callbacks.
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*
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* @since 4.7.0
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* @var array
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*/
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public $callbacks = array();
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/**
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* The priority keys of actively running iterations of a hook.
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*
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* @since 4.7.0
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* @var array
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*/
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private $iterations = array();
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/**
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* The current priority of actively running iterations of a hook.
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*
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* @since 4.7.0
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* @var array
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*/
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private $current_priority = array();
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/**
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* Number of levels this hook can be recursively called.
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*
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* @since 4.7.0
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* @var int
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*/
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private $nesting_level = 0;
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/**
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* Flag for if we're current doing an action, rather than a filter.
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*
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* @since 4.7.0
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* @var bool
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*/
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private $doing_action = false;
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/**
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* Hooks a function or method to a specific filter action.
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*
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* @since 4.7.0
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*
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* @param string $tag The name of the filter to hook the $function_to_add callback to.
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* @param callable $function_to_add The callback to be run when the filter is applied.
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* @param int $priority The order in which the functions associated with a
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* particular action are executed. Lower numbers correspond with
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* earlier execution, and functions with the same priority are executed
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* in the order in which they were added to the action.
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* @param int $accepted_args The number of arguments the function accepts.
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*/
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public function add_filter( $tag, $function_to_add, $priority, $accepted_args ) {
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$idx = _wp_filter_build_unique_id( $tag, $function_to_add, $priority );
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$priority_existed = isset( $this->callbacks[ $priority ] );
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$this->callbacks[ $priority ][ $idx ] = array(
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'function' => $function_to_add,
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'accepted_args' => $accepted_args,
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);
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// if we're adding a new priority to the list, put them back in sorted order
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if ( ! $priority_existed && count( $this->callbacks ) > 1 ) {
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ksort( $this->callbacks, SORT_NUMERIC );
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}
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if ( $this->nesting_level > 0 ) {
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$this->resort_active_iterations( $priority, $priority_existed );
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}
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}
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/**
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* Handles reseting callback priority keys mid-iteration.
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*
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* @since 4.7.0
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*
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* @param bool|int $new_priority Optional. The priority of the new filter being added. Default false,
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* for no priority being added.
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* @param bool $priority_existed Optional. Flag for whether the priority already existed before the new
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* filter was added. Default false.
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*/
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private function resort_active_iterations( $new_priority = false, $priority_existed = false ) {
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$new_priorities = array_keys( $this->callbacks );
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// If there are no remaining hooks, clear out all running iterations.
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if ( ! $new_priorities ) {
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foreach ( $this->iterations as $index => $iteration ) {
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$this->iterations[ $index ] = $new_priorities;
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}
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return;
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}
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$min = min( $new_priorities );
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foreach ( $this->iterations as $index => &$iteration ) {
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$current = current( $iteration );
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// If we're already at the end of this iteration, just leave the array pointer where it is.
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if ( false === $current ) {
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continue;
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}
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$iteration = $new_priorities;
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if ( $current < $min ) {
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array_unshift( $iteration, $current );
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continue;
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}
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while ( current( $iteration ) < $current ) {
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if ( false === next( $iteration ) ) {
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break;
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}
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}
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// If we have a new priority that didn't exist, but ::apply_filters() or ::do_action() thinks it's the current priority...
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if ( $new_priority === $this->current_priority[ $index ] && ! $priority_existed ) {
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/*
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* ... and the new priority is the same as what $this->iterations thinks is the previous
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* priority, we need to move back to it.
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*/
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if ( false === current( $iteration ) ) {
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// If we've already moved off the end of the array, go back to the last element.
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$prev = end( $iteration );
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} else {
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// Otherwise, just go back to the previous element.
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$prev = prev( $iteration );
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}
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if ( false === $prev ) {
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// Start of the array. Reset, and go about our day.
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reset( $iteration );
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} elseif ( $new_priority !== $prev ) {
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// Previous wasn't the same. Move forward again.
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next( $iteration );
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}
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}
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}
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unset( $iteration );
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}
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/**
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* Unhooks a function or method from a specific filter action.
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*
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* @since 4.7.0
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*
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* @param string $tag The filter hook to which the function to be removed is hooked. Used
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* for building the callback ID when SPL is not available.
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* @param callable $function_to_remove The callback to be removed from running when the filter is applied.
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* @param int $priority The exact priority used when adding the original filter callback.
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* @return bool Whether the callback existed before it was removed.
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*/
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public function remove_filter( $tag, $function_to_remove, $priority ) {
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$function_key = _wp_filter_build_unique_id( $tag, $function_to_remove, $priority );
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$exists = isset( $this->callbacks[ $priority ][ $function_key ] );
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if ( $exists ) {
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unset( $this->callbacks[ $priority ][ $function_key ] );
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if ( ! $this->callbacks[ $priority ] ) {
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unset( $this->callbacks[ $priority ] );
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if ( $this->nesting_level > 0 ) {
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$this->resort_active_iterations();
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}
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}
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}
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return $exists;
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}
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/**
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* Checks if a specific action has been registered for this hook.
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*
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* @since 4.7.0
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*
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* @param string $tag Optional. The name of the filter hook. Used for building
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* the callback ID when SPL is not available. Default empty.
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* @param callable|bool $function_to_check Optional. The callback to check for. Default false.
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* @return bool|int The priority of that hook is returned, or false if the function is not attached.
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*/
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public function has_filter( $tag = '', $function_to_check = false ) {
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if ( false === $function_to_check ) {
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return $this->has_filters();
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}
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$function_key = _wp_filter_build_unique_id( $tag, $function_to_check, false );
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if ( ! $function_key ) {
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return false;
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}
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foreach ( $this->callbacks as $priority => $callbacks ) {
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if ( isset( $callbacks[ $function_key ] ) ) {
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return $priority;
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}
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}
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return false;
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}
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/**
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* Checks if any callbacks have been registered for this hook.
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*
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* @since 4.7.0
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*
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* @return bool True if callbacks have been registered for the current hook, otherwise false.
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*/
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public function has_filters() {
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foreach ( $this->callbacks as $callbacks ) {
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if ( $callbacks ) {
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return true;
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}
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}
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return false;
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}
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/**
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* Removes all callbacks from the current filter.
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*
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* @since 4.7.0
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*
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* @param int|bool $priority Optional. The priority number to remove. Default false.
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*/
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public function remove_all_filters( $priority = false ) {
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if ( ! $this->callbacks ) {
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return;
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}
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if ( false === $priority ) {
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$this->callbacks = array();
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} elseif ( isset( $this->callbacks[ $priority ] ) ) {
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unset( $this->callbacks[ $priority ] );
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}
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if ( $this->nesting_level > 0 ) {
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$this->resort_active_iterations();
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}
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}
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/**
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* Calls the callback functions added to a filter hook.
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*
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* @since 4.7.0
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*
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* @param mixed $value The value to filter.
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* @param array $args Arguments to pass to callbacks.
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* @return mixed The filtered value after all hooked functions are applied to it.
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*/
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public function apply_filters( $value, $args ) {
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if ( ! $this->callbacks ) {
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return $value;
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}
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$nesting_level = $this->nesting_level++;
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$this->iterations[ $nesting_level ] = array_keys( $this->callbacks );
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$num_args = count( $args );
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do {
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$this->current_priority[ $nesting_level ] = $priority = current( $this->iterations[ $nesting_level ] );
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foreach ( $this->callbacks[ $priority ] as $the_ ) {
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if ( ! $this->doing_action ) {
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$args[0] = $value;
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}
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// Avoid the array_slice if possible.
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if ( $the_['accepted_args'] == 0 ) {
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$value = call_user_func_array( $the_['function'], array() );
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} elseif ( $the_['accepted_args'] >= $num_args ) {
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$value = call_user_func_array( $the_['function'], $args );
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} else {
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$value = call_user_func_array( $the_['function'], array_slice( $args, 0, (int) $the_['accepted_args'] ) );
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}
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}
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} while ( false !== next( $this->iterations[ $nesting_level ] ) );
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unset( $this->iterations[ $nesting_level ] );
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unset( $this->current_priority[ $nesting_level ] );
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$this->nesting_level--;
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return $value;
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}
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/**
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* Executes the callback functions hooked on a specific action hook.
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*
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* @since 4.7.0
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*
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* @param mixed $args Arguments to pass to the hook callbacks.
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*/
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public function do_action( $args ) {
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$this->doing_action = true;
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$this->apply_filters( '', $args );
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// If there are recursive calls to the current action, we haven't finished it until we get to the last one.
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if ( ! $this->nesting_level ) {
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$this->doing_action = false;
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}
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}
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/**
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* Processes the functions hooked into the 'all' hook.
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*
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* @since 4.7.0
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*
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* @param array $args Arguments to pass to the hook callbacks. Passed by reference.
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*/
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public function do_all_hook( &$args ) {
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$nesting_level = $this->nesting_level++;
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$this->iterations[ $nesting_level ] = array_keys( $this->callbacks );
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do {
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$priority = current( $this->iterations[ $nesting_level ] );
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foreach ( $this->callbacks[ $priority ] as $the_ ) {
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call_user_func_array( $the_['function'], $args );
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}
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} while ( false !== next( $this->iterations[ $nesting_level ] ) );
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unset( $this->iterations[ $nesting_level ] );
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$this->nesting_level--;
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}
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/**
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* Return the current priority level of the currently running iteration of the hook.
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*
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* @since 4.7.0
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*
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* @return int|false If the hook is running, return the current priority level. If it isn't running, return false.
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*/
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public function current_priority() {
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if ( false === current( $this->iterations ) ) {
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return false;
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}
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return current( current( $this->iterations ) );
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}
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/**
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* Normalizes filters set up before WordPress has initialized to WP_Hook objects.
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*
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* @since 4.7.0
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* @static
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*
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* @param array $filters Filters to normalize.
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* @return WP_Hook[] Array of normalized filters.
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*/
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public static function build_preinitialized_hooks( $filters ) {
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/** @var WP_Hook[] $normalized */
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$normalized = array();
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foreach ( $filters as $tag => $callback_groups ) {
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if ( is_object( $callback_groups ) && $callback_groups instanceof WP_Hook ) {
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$normalized[ $tag ] = $callback_groups;
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continue;
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}
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$hook = new WP_Hook();
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// Loop through callback groups.
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foreach ( $callback_groups as $priority => $callbacks ) {
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// Loop through callbacks.
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foreach ( $callbacks as $cb ) {
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$hook->add_filter( $tag, $cb['function'], $priority, $cb['accepted_args'] );
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}
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}
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$normalized[ $tag ] = $hook;
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}
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return $normalized;
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}
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/**
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* Determines whether an offset value exists.
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*
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* @since 4.7.0
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*
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* @link https://secure.php.net/manual/en/arrayaccess.offsetexists.php
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*
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* @param mixed $offset An offset to check for.
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* @return bool True if the offset exists, false otherwise.
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*/
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public function offsetExists( $offset ) {
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return isset( $this->callbacks[ $offset ] );
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}
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/**
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* Retrieves a value at a specified offset.
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*
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* @since 4.7.0
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*
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* @link https://secure.php.net/manual/en/arrayaccess.offsetget.php
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*
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* @param mixed $offset The offset to retrieve.
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* @return mixed If set, the value at the specified offset, null otherwise.
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*/
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public function offsetGet( $offset ) {
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return isset( $this->callbacks[ $offset ] ) ? $this->callbacks[ $offset ] : null;
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}
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/**
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* Sets a value at a specified offset.
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*
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* @since 4.7.0
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*
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* @link https://secure.php.net/manual/en/arrayaccess.offsetset.php
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*
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* @param mixed $offset The offset to assign the value to.
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* @param mixed $value The value to set.
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*/
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public function offsetSet( $offset, $value ) {
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if ( is_null( $offset ) ) {
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$this->callbacks[] = $value;
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} else {
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$this->callbacks[ $offset ] = $value;
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}
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}
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/**
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* Unsets a specified offset.
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*
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* @since 4.7.0
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*
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* @link https://secure.php.net/manual/en/arrayaccess.offsetunset.php
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*
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* @param mixed $offset The offset to unset.
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*/
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public function offsetUnset( $offset ) {
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unset( $this->callbacks[ $offset ] );
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}
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/**
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* Returns the current element.
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*
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* @since 4.7.0
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*
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* @link https://secure.php.net/manual/en/iterator.current.php
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*
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* @return array Of callbacks at current priority.
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*/
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public function current() {
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return current( $this->callbacks );
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}
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/**
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* Moves forward to the next element.
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*
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* @since 4.7.0
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*
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* @link https://secure.php.net/manual/en/iterator.next.php
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*
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* @return array Of callbacks at next priority.
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*/
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public function next() {
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return next( $this->callbacks );
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}
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/**
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* Returns the key of the current element.
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*
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* @since 4.7.0
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*
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* @link https://secure.php.net/manual/en/iterator.key.php
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*
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* @return mixed Returns current priority on success, or NULL on failure
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*/
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public function key() {
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return key( $this->callbacks );
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}
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/**
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* Checks if current position is valid.
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*
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* @since 4.7.0
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*
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* @link https://secure.php.net/manual/en/iterator.valid.php
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*
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* @return boolean
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*/
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public function valid() {
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return key( $this->callbacks ) !== null;
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}
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/**
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* Rewinds the Iterator to the first element.
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*
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* @since 4.7.0
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*
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* @link https://secure.php.net/manual/en/iterator.rewind.php
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*/
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public function rewind() {
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reset( $this->callbacks );
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}
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}
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