252 lines
7.1 KiB
JavaScript
Executable File
252 lines
7.1 KiB
JavaScript
Executable File
( function( window, undefined ) {
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"use strict";
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/**
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* Handles managing all events for whatever you plug it into. Priorities for hooks are based on lowest to highest in
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* that, lowest priority hooks are fired first.
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*/
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var EventManager = function() {
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/**
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* Maintain a reference to the object scope so our public methods never get confusing.
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*/
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var MethodsAvailable = {
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removeFilter : removeFilter,
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applyFilters : applyFilters,
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addFilter : addFilter,
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removeAction : removeAction,
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doAction : doAction,
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addAction : addAction,
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storage : getStorage
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};
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/**
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* Contains the hooks that get registered with this EventManager. The array for storage utilizes a "flat"
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* object literal such that looking up the hook utilizes the native object literal hash.
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*/
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var STORAGE = {
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actions : {},
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filters : {}
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};
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function getStorage() {
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return STORAGE;
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};
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/**
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* Adds an action to the event manager.
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*
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* @param action Must contain namespace.identifier
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* @param callback Must be a valid callback function before this action is added
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* @param [priority=10] Used to control when the function is executed in relation to other callbacks bound to the same hook
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* @param [context] Supply a value to be used for this
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*/
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function addAction( action, callback, priority, context ) {
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if( typeof action === 'string' && typeof callback === 'function' ) {
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priority = parseInt( ( priority || 10 ), 10 );
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_addHook( 'actions', action, callback, priority, context );
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}
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return MethodsAvailable;
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}
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/**
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* Performs an action if it exists. You can pass as many arguments as you want to this function; the only rule is
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* that the first argument must always be the action.
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*/
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function doAction( /* action, arg1, arg2, ... */ ) {
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var args = Array.prototype.slice.call( arguments );
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var action = args.shift();
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if( typeof action === 'string' ) {
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_runHook( 'actions', action, args );
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}
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return MethodsAvailable;
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}
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/**
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* Removes the specified action if it contains a namespace.identifier & exists.
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*
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* @param action The action to remove
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* @param [callback] Callback function to remove
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*/
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function removeAction( action, callback ) {
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if( typeof action === 'string' ) {
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_removeHook( 'actions', action, callback );
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}
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return MethodsAvailable;
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}
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/**
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* Adds a filter to the event manager.
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*
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* @param filter Must contain namespace.identifier
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* @param callback Must be a valid callback function before this action is added
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* @param [priority=10] Used to control when the function is executed in relation to other callbacks bound to the same hook
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* @param [context] Supply a value to be used for this
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*/
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function addFilter( filter, callback, priority, context ) {
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if( typeof filter === 'string' && typeof callback === 'function' ) {
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priority = parseInt( ( priority || 10 ), 10 );
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_addHook( 'filters', filter, callback, priority, context );
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}
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return MethodsAvailable;
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}
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/**
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* Performs a filter if it exists. You should only ever pass 1 argument to be filtered. The only rule is that
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* the first argument must always be the filter.
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*/
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function applyFilters( /* filter, filtered arg, arg2, ... */ ) {
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var args = Array.prototype.slice.call( arguments );
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var filter = args.shift();
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if( typeof filter === 'string' ) {
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return _runHook( 'filters', filter, args );
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}
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return MethodsAvailable;
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}
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/**
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* Removes the specified filter if it contains a namespace.identifier & exists.
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*
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* @param filter The action to remove
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* @param [callback] Callback function to remove
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*/
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function removeFilter( filter, callback ) {
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if( typeof filter === 'string') {
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_removeHook( 'filters', filter, callback );
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}
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return MethodsAvailable;
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}
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/**
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* Removes the specified hook by resetting the value of it.
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*
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* @param type Type of hook, either 'actions' or 'filters'
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* @param hook The hook (namespace.identifier) to remove
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* @private
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*/
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function _removeHook( type, hook, callback, context ) {
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if ( !STORAGE[ type ][ hook ] ) {
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return;
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}
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if ( !callback ) {
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STORAGE[ type ][ hook ] = [];
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} else {
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var handlers = STORAGE[ type ][ hook ];
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var i;
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if ( !context ) {
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for ( i = handlers.length; i--; ) {
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if ( handlers[i].callback === callback ) {
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handlers.splice( i, 1 );
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}
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}
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}
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else {
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for ( i = handlers.length; i--; ) {
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var handler = handlers[i];
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if ( handler.callback === callback && handler.context === context) {
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handlers.splice( i, 1 );
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}
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}
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}
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}
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}
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/**
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* Adds the hook to the appropriate storage container
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*
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* @param type 'actions' or 'filters'
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* @param hook The hook (namespace.identifier) to add to our event manager
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* @param callback The function that will be called when the hook is executed.
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* @param priority The priority of this hook. Must be an integer.
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* @param [context] A value to be used for this
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* @private
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*/
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function _addHook( type, hook, callback, priority, context ) {
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var hookObject = {
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callback : callback,
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priority : priority,
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context : context
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};
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// Utilize 'prop itself' : http://jsperf.com/hasownproperty-vs-in-vs-undefined/19
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var hooks = STORAGE[ type ][ hook ];
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if( hooks ) {
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hooks.push( hookObject );
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hooks = _hookInsertSort( hooks );
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}
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else {
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hooks = [ hookObject ];
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}
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STORAGE[ type ][ hook ] = hooks;
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}
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/**
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* Use an insert sort for keeping our hooks organized based on priority. This function is ridiculously faster
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* than bubble sort, etc: http://jsperf.com/javascript-sort
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*
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* @param hooks The custom array containing all of the appropriate hooks to perform an insert sort on.
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* @private
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*/
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function _hookInsertSort( hooks ) {
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var tmpHook, j, prevHook;
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for( var i = 1, len = hooks.length; i < len; i++ ) {
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tmpHook = hooks[ i ];
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j = i;
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while( ( prevHook = hooks[ j - 1 ] ) && prevHook.priority > tmpHook.priority ) {
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hooks[ j ] = hooks[ j - 1 ];
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--j;
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}
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hooks[ j ] = tmpHook;
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}
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return hooks;
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}
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/**
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* Runs the specified hook. If it is an action, the value is not modified but if it is a filter, it is.
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*
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* @param type 'actions' or 'filters'
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* @param hook The hook ( namespace.identifier ) to be ran.
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* @param args Arguments to pass to the action/filter. If it's a filter, args is actually a single parameter.
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* @private
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*/
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function _runHook( type, hook, args ) {
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var handlers = STORAGE[ type ][ hook ];
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if ( !handlers ) {
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return (type === 'filters') ? args[0] : false;
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}
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var i = 0, len = handlers.length;
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if ( type === 'filters' ) {
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for ( ; i < len; i++ ) {
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args[ 0 ] = handlers[ i ].callback.apply( handlers[ i ].context, args );
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}
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} else {
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for ( ; i < len; i++ ) {
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handlers[ i ].callback.apply( handlers[ i ].context, args );
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}
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}
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return ( type === 'filters' ) ? args[ 0 ] : true;
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}
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// return all of the publicly available methods
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return MethodsAvailable;
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};
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// instantiate
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acf.hooks = new EventManager();
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} )( window ); |