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/*!
* OOjs v7.0.1
* https://www.mediawiki.org/wiki/OOjs
*
* Copyright 2011-2023 OOjs Team and other contributors.
* Released under the MIT license
* https://oojs.mit-license.org
*/
( function ( global ) {
'use strict';
/* exported slice, toString */
/**
* Namespace for all classes, static methods and static properties.
*
* @namespace OO
*/
var
// eslint-disable-next-line no-redeclare
OO = {},
// Optimisation: Local reference to methods from a global prototype
hasOwn = OO.hasOwnProperty,
slice = Array.prototype.slice,
// eslint-disable-next-line no-redeclare
toString = OO.toString;
/* Class Methods */
/**
* Utility to initialize a class for OO inheritance.
*
* Currently this just initializes an empty static object.
*
* @memberof OO
* @method initClass
* @param {Function} fn
*/
OO.initClass = function ( fn ) {
fn.static = fn.static || {};
};
/**
* Inherit from prototype to another using Object#create.
*
* Beware: This redefines the prototype, call before setting your prototypes.
*
* Beware: This redefines the prototype, can only be called once on a function.
* If called multiple times on the same function, the previous prototype is lost.
* This is how prototypal inheritance works, it can only be one straight chain
* (just like classical inheritance in PHP for example). If you need to work with
* multiple constructors consider storing an instance of the other constructor in a
* property instead, or perhaps use a mixin (see OO.mixinClass).
*
* function Thing() {}
* Thing.prototype.exists = function () {};
*
* function Person() {
* Person.super.apply( this, arguments );
* }
* OO.inheritClass( Person, Thing );
* Person.static.defaultEyeCount = 2;
* Person.prototype.walk = function () {};
*
* function Jumper() {
* Jumper.super.apply( this, arguments );
* }
* OO.inheritClass( Jumper, Person );
* Jumper.prototype.jump = function () {};
*
* Jumper.static.defaultEyeCount === 2;
* var x = new Jumper();
* x.jump();
* x.walk();
* x instanceof Thing && x instanceof Person && x instanceof Jumper;
*
* @memberof OO
* @method inheritClass
* @param {Function} targetFn
* @param {Function} originFn
* @throws {Error} If target already inherits from origin
*/
OO.inheritClass = function ( targetFn, originFn ) {
if ( !originFn ) {
throw new Error( 'inheritClass: Origin is not a function (actually ' + originFn + ')' );
}
if ( targetFn.prototype instanceof originFn ) {
throw new Error( 'inheritClass: Target already inherits from origin' );
}
var targetConstructor = targetFn.prototype.constructor;
// [DEPRECATED] Provide .parent as alias for code supporting older browsers which
// allows people to comply with their style guide.
targetFn.super = targetFn.parent = originFn;
targetFn.prototype = Object.create( originFn.prototype, {
// Restore constructor property of targetFn
constructor: {
value: targetConstructor,
enumerable: false,
writable: true,
configurable: true
}
} );
// Extend static properties - always initialize both sides
OO.initClass( originFn );
targetFn.static = Object.create( originFn.static );
};
/**
* Copy over *own* prototype properties of a mixin.
*
* The 'constructor' (whether implicit or explicit) is not copied over.
*
* This does not create inheritance to the origin. If you need inheritance,
* use OO.inheritClass instead.
*
* Beware: This can redefine a prototype property, call before setting your prototypes.
*
* Beware: Don't call before OO.inheritClass.
*
* function Foo() {}
* function Context() {}
*
* // Avoid repeating this code
* function ContextLazyLoad() {}
* ContextLazyLoad.prototype.getContext = function () {
* if ( !this.context ) {
* this.context = new Context();
* }
* return this.context;
* };
*
* function FooBar() {}
* OO.inheritClass( FooBar, Foo );
* OO.mixinClass( FooBar, ContextLazyLoad );
*
* @memberof OO
* @method mixinClass
* @param {Function} targetFn
* @param {Function} originFn
*/
OO.mixinClass = function ( targetFn, originFn ) {
if ( !originFn ) {
throw new Error( 'mixinClass: Origin is not a function (actually ' + originFn + ')' );
}
var key;
// Copy prototype properties
for ( key in originFn.prototype ) {
if ( key !== 'constructor' && hasOwn.call( originFn.prototype, key ) ) {
targetFn.prototype[ key ] = originFn.prototype[ key ];
}
}
// Copy static properties - always initialize both sides
OO.initClass( targetFn );
if ( originFn.static ) {
for ( key in originFn.static ) {
if ( hasOwn.call( originFn.static, key ) ) {
targetFn.static[ key ] = originFn.static[ key ];
}
}
} else {
OO.initClass( originFn );
}
};
/**
* Test whether one class is a subclass of another, without instantiating it.
*
* Every class is considered a subclass of Object and of itself.
*
* @memberof OO
* @method isSubClass
* @param {Function} testFn The class to be tested
* @param {Function} baseFn The base class
* @return {boolean} Whether testFn is a subclass of baseFn (or equal to it)
*/
OO.isSubclass = function ( testFn, baseFn ) {
return testFn === baseFn || testFn.prototype instanceof baseFn;
};
/* Object Methods */
/**
* Get a deeply nested property of an object using variadic arguments, protecting against
* undefined property errors.
*
* `quux = OO.getProp( obj, 'foo', 'bar', 'baz' );` is equivalent to `quux = obj.foo.bar.baz;`
* except that the former protects against JS errors if one of the intermediate properties
* is undefined. Instead of throwing an error, this function will return undefined in
* that case.
*
* @memberof OO
* @method getProp
* @param {Object} obj
* @param {...any} [keys]
* @return {Object|undefined} obj[arguments[1]][arguments[2]].... or undefined
*/
OO.getProp = function ( obj ) {
var retval = obj;
for ( var i = 1; i < arguments.length; i++ ) {
if ( retval === undefined || retval === null ) {
// Trying to access a property of undefined or null causes an error
return undefined;
}
retval = retval[ arguments[ i ] ];
}
return retval;
};
/**
* Set a deeply nested property of an object using variadic arguments, protecting against
* undefined property errors.
*
* `OO.setProp( obj, 'foo', 'bar', 'baz' );` is equivalent to `obj.foo.bar = baz;` except that
* the former protects against JS errors if one of the intermediate properties is
* undefined. Instead of throwing an error, undefined intermediate properties will be
* initialized to an empty object. If an intermediate property is not an object, or if obj itself
* is not an object, this function will silently abort.
*
* @memberof OO
* @method setProp
* @param {Object} obj
* @param {...any} [keys]
* @param {any} [value]
*/
OO.setProp = function ( obj ) {
if ( Object( obj ) !== obj || arguments.length < 2 ) {
return;
}
var prop = obj;
for ( var i = 1; i < arguments.length - 2; i++ ) {
if ( prop[ arguments[ i ] ] === undefined ) {
prop[ arguments[ i ] ] = {};
}
if ( Object( prop[ arguments[ i ] ] ) !== prop[ arguments[ i ] ] ) {
return;
}
prop = prop[ arguments[ i ] ];
}
prop[ arguments[ arguments.length - 2 ] ] = arguments[ arguments.length - 1 ];
};
/**
* Delete a deeply nested property of an object using variadic arguments, protecting against
* undefined property errors, and deleting resulting empty objects.
*
* @memberof OO
* @method deleteProp
* @param {Object} obj
* @param {...any} [keys]
*/
OO.deleteProp = function ( obj ) {
if ( Object( obj ) !== obj || arguments.length < 2 ) {
return;
}
var prop = obj;
var props = [ prop ];
var i = 1;
for ( ; i < arguments.length - 1; i++ ) {
if (
prop[ arguments[ i ] ] === undefined ||
Object( prop[ arguments[ i ] ] ) !== prop[ arguments[ i ] ]
) {
return;
}
prop = prop[ arguments[ i ] ];
props.push( prop );
}
delete prop[ arguments[ i ] ];
// Walk back through props removing any plain empty objects
while (
props.length > 1 &&
( prop = props.pop() ) &&
OO.isPlainObject( prop ) && !Object.keys( prop ).length
) {
delete props[ props.length - 1 ][ arguments[ props.length ] ];
}
};
/**
* Create a new object that is an instance of the same
* constructor as the input, inherits from the same object
* and contains the same own properties.
*
* This makes a shallow non-recursive copy of own properties.
* To create a recursive copy of plain objects, use #copy.
*
* var foo = new Person( mom, dad );
* foo.setAge( 21 );
* var foo2 = OO.cloneObject( foo );
* foo.setAge( 22 );
*
* // Then
* foo2 !== foo; // true
* foo2 instanceof Person; // true
* foo2.getAge(); // 21
* foo.getAge(); // 22
*
* @memberof OO
* @method cloneObject
* @param {Object} origin
* @return {Object} Clone of origin
*/
OO.cloneObject = function ( origin ) {
var r = Object.create( origin.constructor.prototype );
for ( var key in origin ) {
if ( hasOwn.call( origin, key ) ) {
r[ key ] = origin[ key ];
}
}
return r;
};
/**
* Get an array of all property values in an object.
*
* @memberof OO
* @method getObjectValues
* @param {Object} obj Object to get values from
* @return {Array} List of object values
*/
OO.getObjectValues = function ( obj ) {
if ( obj !== Object( obj ) ) {
throw new TypeError( 'Called on non-object' );
}
var values = [];
for ( var key in obj ) {
if ( hasOwn.call( obj, key ) ) {
values[ values.length ] = obj[ key ];
}
}
return values;
};
/**
* Use binary search to locate an element in a sorted array.
*
* searchFunc is given an element from the array. `searchFunc(elem)` must return a number
* above 0 if the element we're searching for is to the right of (has a higher index than) elem,
* below 0 if it is to the left of elem, or zero if it's equal to elem.
*
* To search for a specific value with a comparator function (a `function cmp(a,b)` that returns
* above 0 if `a > b`, below 0 if `a < b`, and 0 if `a == b`), you can use
* `searchFunc = cmp.bind( null, value )`.
*
* @memberof OO
* @method binarySearch
* @param {Array} arr Array to search in
* @param {Function} searchFunc Search function
* @param {boolean} [forInsertion] If not found, return index where val could be inserted
* @return {number|null} Index where val was found, or null if not found
*/
OO.binarySearch = function ( arr, searchFunc, forInsertion ) {
var left = 0;
var right = arr.length;
while ( left < right ) {
// Equivalent to Math.floor( ( left + right ) / 2 ) but much faster
// eslint-disable-next-line no-bitwise
var mid = ( left + right ) >> 1;
var cmpResult = searchFunc( arr[ mid ] );
if ( cmpResult < 0 ) {
right = mid;
} else if ( cmpResult > 0 ) {
left = mid + 1;
} else {
return mid;
}
}
return forInsertion ? right : null;
};
/**
* Recursively compare properties between two objects.
*
* A false result may be caused by property inequality or by properties in one object missing from
* the other. An asymmetrical test may also be performed, which checks only that properties in the
* first object are present in the second object, but not the inverse.
*
* If either a or b is null or undefined it will be treated as an empty object.
*
* @memberof OO
* @method compare
* @param {Object|undefined|null} a First object to compare
* @param {Object|undefined|null} b Second object to compare
* @param {boolean} [asymmetrical] Whether to check only that a's values are equal to b's
* (i.e. a is a subset of b)
* @return {boolean} If the objects contain the same values as each other
*/
OO.compare = function ( a, b, asymmetrical ) {
if ( a === b ) {
return true;
}
a = a || {};
b = b || {};
if ( typeof a.nodeType === 'number' && typeof a.isEqualNode === 'function' ) {
return a.isEqualNode( b );
}
for ( var k in a ) {
if ( !hasOwn.call( a, k ) || a[ k ] === undefined || a[ k ] === b[ k ] ) {
// Ignore undefined values, because there is no conceptual difference between
// a key that is absent and a key that is present but whose value is undefined.
continue;
}
var aValue = a[ k ];
var bValue = b[ k ];
var aType = typeof aValue;
var bType = typeof bValue;
if ( aType !== bType ||
(
( aType === 'string' || aType === 'number' || aType === 'boolean' ) &&
aValue !== bValue
) ||
( aValue === Object( aValue ) && !OO.compare( aValue, bValue, true ) ) ) {
return false;
}
}
// If the check is not asymmetrical, recursing with the arguments swapped will verify our result
return asymmetrical ? true : OO.compare( b, a, true );
};
/**
* Create a plain deep copy of any kind of object.
*
* Copies are deep, and will either be an object or an array depending on `source`.
*
* @memberof OO
* @method copy
* @param {Object} source Object to copy
* @param {Function} [leafCallback] Applied to leaf values after they are cloned but before they are
* added to the clone
* @param {Function} [nodeCallback] Applied to all values before they are cloned. If the
* nodeCallback returns a value other than undefined, the returned value is used instead of
* attempting to clone.
* @return {Object} Copy of source object
*/
OO.copy = function ( source, leafCallback, nodeCallback ) {
var destination;
if ( nodeCallback ) {
// Extensibility: check before attempting to clone source.
destination = nodeCallback( source );
if ( destination !== undefined ) {
return destination;
}
}
if ( Array.isArray( source ) ) {
// Array (fall through)
destination = new Array( source.length );
} else if ( source && typeof source.clone === 'function' ) {
// Duck type object with custom clone method
return leafCallback ? leafCallback( source.clone() ) : source.clone();
} else if ( source && typeof source.cloneNode === 'function' ) {
// DOM Node
return leafCallback ?
leafCallback( source.cloneNode( true ) ) :
source.cloneNode( true );
} else if ( OO.isPlainObject( source ) ) {
// Plain objects (fall through)
destination = {};
} else {
// Non-plain objects (incl. functions) and primitive values
return leafCallback ? leafCallback( source ) : source;
}
// source is an array or a plain object
for ( var key in source ) {
destination[ key ] = OO.copy( source[ key ], leafCallback, nodeCallback );
}
// This is an internal node, so we don't apply the leafCallback.
return destination;
};
/**
* Generate a hash of an object based on its name and data.
*
* Performance optimization: <http://jsperf.com/ve-gethash-201208#/toJson_fnReplacerIfAoForElse>
*
* To avoid two objects with the same values generating different hashes, we utilize the replacer
* argument of JSON.stringify and sort the object by key as it's being serialized. This may or may
* not be the fastest way to do this; we should investigate this further.
*
* Objects and arrays are hashed recursively. When hashing an object that has a .getHash()
* function, we call that function and use its return value rather than hashing the object
* ourselves. This allows classes to define custom hashing.
*
* @memberof OO
* @method getHash
* @param {Object} val Object to generate hash for
* @return {string} Hash of object
*/
OO.getHash = function ( val ) {
return JSON.stringify( val, OO.getHash.keySortReplacer );
};
/**
* Sort objects by key (helper function for OO.getHash).
*
* This is a callback passed into JSON.stringify.
*
* @memberof OO
* @method getHash_keySortReplacer
* @param {string} key Property name of value being replaced
* @param {any} val Property value to replace
* @return {any} Replacement value
*/
OO.getHash.keySortReplacer = function ( key, val ) {
if ( val && typeof val.getHashObject === 'function' ) {
// This object has its own custom hash function, use it
val = val.getHashObject();
}
if ( !Array.isArray( val ) && Object( val ) === val ) {
// Only normalize objects when the key-order is ambiguous
// (e.g. any object not an array).
var normalized = {};
var keys = Object.keys( val ).sort();
for ( var i = 0, len = keys.length; i < len; i++ ) {
normalized[ keys[ i ] ] = val[ keys[ i ] ];
}
return normalized;
} else {
// Primitive values and arrays get stable hashes
// by default. Lets those be stringified as-is.
return val;
}
};
/**
* Get the unique values of an array, removing duplicates.
*
* @memberof OO
* @method unique
* @param {Array} arr Array
* @return {Array} Unique values in array
*/
OO.unique = function ( arr ) {
return Array.from( new Set( arr ) );
};
/**
* Compute the union (duplicate-free merge) of a set of arrays.
*
* @memberof OO
* @method simpleArrayUnion
* @param {Array} a First array
* @param {...Array} rest Arrays to union
* @return {Array} Union of the arrays
*/
OO.simpleArrayUnion = function ( a, ...rest ) {
var set = new Set( a );
for ( var i = 0; i < rest.length; i++ ) {
var arr = rest[ i ];
for ( var j = 0; j < arr.length; j++ ) {
set.add( arr[ j ] );
}
}
return Array.from( set );
};
/**
* Combine arrays (intersection or difference).
*
* An intersection checks the item exists in 'b' while difference checks it doesn't.
*
* @private
* @param {Array} a First array
* @param {Array} b Second array
* @param {boolean} includeB Whether to items in 'b'
* @return {Array} Combination (intersection or difference) of arrays
*/
function simpleArrayCombine( a, b, includeB ) {
var set = new Set( b );
var result = [];
for ( var j = 0; j < a.length; j++ ) {
var isInB = set.has( a[ j ] );
if ( isInB === includeB ) {
result.push( a[ j ] );
}
}
return result;
}
/**
* Compute the intersection of two arrays (items in both arrays).
*
* @memberof OO
* @method simpleArrayIntersection
* @param {Array} a First array
* @param {Array} b Second array
* @return {Array} Intersection of arrays
*/
OO.simpleArrayIntersection = function ( a, b ) {
return simpleArrayCombine( a, b, true );
};
/**
* Compute the difference of two arrays (items in 'a' but not 'b').
*
* @memberof OO
* @method simpleArrayDifference
* @param {Array} a First array
* @param {Array} b Second array
* @return {Array} Intersection of arrays
*/
OO.simpleArrayDifference = function ( a, b ) {
return simpleArrayCombine( a, b, false );
};
/* eslint-disable-next-line no-redeclare */
/* global hasOwn, toString */
/**
* Assert whether a value is a plain object or not.
*
* @memberof OO
* @param {any} obj
* @return {boolean}
*/
OO.isPlainObject = function ( obj ) {
// Optimise for common case where internal [[Class]] property is not "Object"
if ( !obj || toString.call( obj ) !== '[object Object]' ) {
return false;
}
var proto = Object.getPrototypeOf( obj );
// Objects without prototype (e.g., `Object.create( null )`) are considered plain
if ( !proto ) {
return true;
}
// The 'isPrototypeOf' method is set on Object.prototype.
return hasOwn.call( proto, 'isPrototypeOf' );
};
/* global hasOwn, slice */
( function () {
/**
* @class
*/
OO.EventEmitter = function OoEventEmitter() {
// Properties
/**
* Storage of bound event handlers by event name.
*
* @private
* @property {Object} bindings
*/
this.bindings = {};
};
OO.initClass( OO.EventEmitter );
/* Private helper functions */
/**
* Validate a function or method call in a context
*
* For a method name, check that it names a function in the context object
*
* @private
* @param {Function|string} method Function or method name
* @param {any} context The context of the call
* @throws {Error} A method name is given but there is no context
* @throws {Error} In the context object, no property exists with the given name
* @throws {Error} In the context object, the named property is not a function
*/
function validateMethod( method, context ) {
// Validate method and context
if ( typeof method === 'string' ) {
// Validate method
if ( context === undefined || context === null ) {
throw new Error( 'Method name "' + method + '" has no context.' );
}
if ( typeof context[ method ] !== 'function' ) {
// Technically the property could be replaced by a function before
// call time. But this probably signals a typo.
throw new Error( 'Property "' + method + '" is not a function' );
}
} else if ( typeof method !== 'function' ) {
throw new Error( 'Invalid callback. Function or method name expected.' );
}
}
/**
* @private
* @param {OO.EventEmitter} eventEmitter Event emitter
* @param {string} event Event name
* @param {Object} binding
*/
function addBinding( eventEmitter, event, binding ) {
var bindings;
// Auto-initialize bindings list
if ( hasOwn.call( eventEmitter.bindings, event ) ) {
bindings = eventEmitter.bindings[ event ];
} else {
bindings = eventEmitter.bindings[ event ] = [];
}
// Add binding
bindings.push( binding );
}
/* Methods */
/**
* Add a listener to events of a specific event.
*
* The listener can be a function or the string name of a method; if the latter, then the
* name lookup happens at the time the listener is called.
*
* @param {string} event Type of event to listen to
* @param {Function|string} method Function or method name to call when event occurs
* @param {Array} [args] Arguments to pass to listener, will be prepended to emitted arguments
* @param {Object} [context=null] Context object for function or method call
* @return {OO.EventEmitter}
* @throws {Error} Listener argument is not a function or a valid method name
*/
OO.EventEmitter.prototype.on = function ( event, method, args, context ) {
validateMethod( method, context );
// Ensure consistent object shape (optimisation)
addBinding( this, event, {
method: method,
args: args,
context: ( arguments.length < 4 ) ? null : context,
once: false
} );
return this;
};
/**
* Add a one-time listener to a specific event.
*
* @param {string} event Type of event to listen to
* @param {Function} listener Listener to call when event occurs
* @return {OO.EventEmitter}
*/
OO.EventEmitter.prototype.once = function ( event, listener ) {
validateMethod( listener );
// Ensure consistent object shape (optimisation)
addBinding( this, event, {
method: listener,
args: undefined,
context: null,
once: true
} );
return this;
};
/**
* Remove a specific listener from a specific event.
*
* @param {string} event Type of event to remove listener from
* @param {Function|string} [method] Listener to remove. Must be in the same form as was passed
* to "on". Omit to remove all listeners.
* @param {Object} [context=null] Context object function or method call
* @return {OO.EventEmitter}
* @throws {Error} Listener argument is not a function or a valid method name
*/
OO.EventEmitter.prototype.off = function ( event, method, context ) {
if ( arguments.length === 1 ) {
// Remove all bindings for event
delete this.bindings[ event ];
return this;
}
validateMethod( method, context );
if ( !hasOwn.call( this.bindings, event ) || !this.bindings[ event ].length ) {
// No matching bindings
return this;
}
// Default to null context
if ( arguments.length < 3 ) {
context = null;
}
// Remove matching handlers
var bindings = this.bindings[ event ];
var i = bindings.length;
while ( i-- ) {
if ( bindings[ i ].method === method && bindings[ i ].context === context ) {
bindings.splice( i, 1 );
}
}
// Cleanup if now empty
if ( bindings.length === 0 ) {
delete this.bindings[ event ];
}
return this;
};
/**
* Emit an event.
*
* All listeners for the event will be called synchronously, in an
* unspecified order. If any listeners throw an exception, this won't
* disrupt the calls to the remaining listeners; however, the exception
* won't be thrown until the next tick.
*
* Listeners should avoid mutating the emitting object, as this is
* something of an anti-pattern which can easily result in
* hard-to-understand code with hidden side-effects and dependencies.
*
* @param {string} event Type of event
* @param {...any} [args] Arguments passed to the event handler
* @return {boolean} Whether the event was handled by at least one listener
*/
OO.EventEmitter.prototype.emit = function ( event ) {
if ( !hasOwn.call( this.bindings, event ) ) {
return false;
}
// Slicing ensures that we don't get tripped up by event
// handlers that add/remove bindings
var bindings = this.bindings[ event ].slice();
var args = slice.call( arguments, 1 );
for ( var i = 0; i < bindings.length; i++ ) {
var binding = bindings[ i ];
var method;
if ( typeof binding.method === 'string' ) {
// Lookup method by name (late binding)
method = binding.context[ binding.method ];
} else {
method = binding.method;
}
if ( binding.once ) {
// Unbind before calling, to avoid any nested triggers.
this.off( event, method );
}
try {
method.apply(
binding.context,
binding.args ? binding.args.concat( args ) : args
);
} catch ( e ) {
// If one listener has an unhandled error, don't have it
// take down the emitter. But rethrow asynchronously so
// debuggers can break with a full async stack trace.
setTimeout( ( function ( error ) {
throw error;
} ).bind( null, e ) );
}
}
return true;
};
/**
* Emit an event, propagating the first exception some listener throws
*
* All listeners for the event will be called synchronously, in an
* unspecified order. If any listener throws an exception, this won't
* disrupt the calls to the remaining listeners. The first exception
* thrown will be propagated back to the caller; any others won't be
* thrown until the next tick.
*
* Listeners should avoid mutating the emitting object, as this is
* something of an anti-pattern which can easily result in
* hard-to-understand code with hidden side-effects and dependencies.
*
* @param {string} event Type of event
* @param {...any} [args] Arguments passed to the event handler
* @return {boolean} Whether the event was handled by at least one listener
*/
OO.EventEmitter.prototype.emitThrow = function ( event ) {
// We tolerate code duplication with #emit, because the
// alternative is an extra level of indirection which will
// appear in very many stack traces.
if ( !hasOwn.call( this.bindings, event ) ) {
return false;
}
var firstError;
// Slicing ensures that we don't get tripped up by event
// handlers that add/remove bindings
var bindings = this.bindings[ event ].slice();
var args = slice.call( arguments, 1 );
for ( var i = 0; i < bindings.length; i++ ) {
var binding = bindings[ i ];
var method;
if ( typeof binding.method === 'string' ) {
// Lookup method by name (late binding)
method = binding.context[ binding.method ];
} else {
method = binding.method;
}
if ( binding.once ) {
// Unbind before calling, to avoid any nested triggers.
this.off( event, method );
}
try {
method.apply(
binding.context,
binding.args ? binding.args.concat( args ) : args
);
} catch ( e ) {
if ( firstError === undefined ) {
firstError = e;
} else {
// If one listener has an unhandled error, don't have it
// take down the emitter. But rethrow asynchronously so
// debuggers can break with a full async stack trace.
setTimeout( ( function ( error ) {
throw error;
} ).bind( null, e ) );
}
}
}
if ( firstError !== undefined ) {
throw firstError;
}
return true;
};
/**
* Connect event handlers to an object.
*
* @param {Object} context Object to call methods on when events occur
* @param {Object.<string,string>|Object.<string,Function>|Object.<string,Array>} methods
* List of event bindings keyed by event name containing either method names, functions or
* arrays containing method name or function followed by a list of arguments to be passed to
* callback before emitted arguments.
* @return {OO.EventEmitter}
*/
OO.EventEmitter.prototype.connect = function ( context, methods ) {
for ( var event in methods ) {
var method = methods[ event ];
var args;
// Allow providing additional args
if ( Array.isArray( method ) ) {
args = method.slice( 1 );
method = method[ 0 ];
} else {
args = [];
}
// Add binding
this.on( event, method, args, context );
}
return this;
};
/**
* Disconnect event handlers from an object.
*
* @param {Object} context Object to disconnect methods from
* @param {Object.<string,string>|Object.<string,Function>|Object.<string,Array>} [methods]
* List of event bindings keyed by event name. Values can be either method names, functions or
* arrays containing a method name.
* NOTE: To allow matching call sites with connect(), array values are allowed to contain the
* parameters as well, but only the method name is used to find bindings. It is discouraged to
* have multiple bindings for the same event to the same listener, but if used (and only the
* parameters vary), disconnecting one variation of (event name, event listener, parameters)
* will disconnect other variations as well.
* @return {OO.EventEmitter}
*/
OO.EventEmitter.prototype.disconnect = function ( context, methods ) {
var event;
if ( methods ) {
// Remove specific connections to the context
for ( event in methods ) {
var method = methods[ event ];
if ( Array.isArray( method ) ) {
method = method[ 0 ];
}
this.off( event, method, context );
}
} else {
// Remove all connections to the context
for ( event in this.bindings ) {
var bindings = this.bindings[ event ];
var i = bindings.length;
while ( i-- ) {
// bindings[i] may have been removed by the previous step's
// this.off so check it still exists
if ( bindings[ i ] && bindings[ i ].context === context ) {
this.off( event, bindings[ i ].method, context );
}
}
}
}
return this;
};
}() );
( function () {
/**
* Contain and manage a list of @{link OO.EventEmitter} items.
*
* Aggregates and manages their events collectively.
*
* This mixin must be used in a class that also mixes in @{link OO.EventEmitter}.
*
* @abstract
* @class
*/
OO.EmitterList = function OoEmitterList() {
this.items = [];
this.aggregateItemEvents = {};
};
OO.initClass( OO.EmitterList );
/* Events */
/**
* Item has been added.
*
* @event OO.EmitterList#add
* @param {OO.EventEmitter} item Added item
* @param {number} index Index items were added at
*/
/**
* Item has been moved to a new index.
*
* @event OO.EmitterList#move
* @param {OO.EventEmitter} item Moved item
* @param {number} index Index item was moved to
* @param {number} oldIndex The original index the item was in
*/
/**
* Item has been removed.
*
* @event OO.EmitterList#remove
* @param {OO.EventEmitter} item Removed item
* @param {number} index Index the item was removed from
*/
/**
* The list has been cleared of items.
*
* @event OO.EmitterList#clear
*/
/* Methods */
/**
* Normalize requested index to fit into the bounds of the given array.
*
* @private
* @static
* @param {Array} arr Given array
* @param {number|undefined} index Requested index
* @return {number} Normalized index
*/
function normalizeArrayIndex( arr, index ) {
return ( index === undefined || index < 0 || index >= arr.length ) ?
arr.length :
index;
}
/**
* Get all items.
*
* @return {OO.EventEmitter[]} Items in the list
*/
OO.EmitterList.prototype.getItems = function () {
return this.items.slice( 0 );
};
/**
* Get the index of a specific item.
*
* @param {OO.EventEmitter} item Requested item
* @return {number} Index of the item
*/
OO.EmitterList.prototype.getItemIndex = function ( item ) {
return this.items.indexOf( item );
};
/**
* Get number of items.
*
* @return {number} Number of items in the list
*/
OO.EmitterList.prototype.getItemCount = function () {
return this.items.length;
};
/**
* Check if a list contains no items.
*
* @return {boolean} Group is empty
*/
OO.EmitterList.prototype.isEmpty = function () {
return !this.items.length;
};
/**
* Aggregate the events emitted by the group.
*
* When events are aggregated, the group will listen to all contained items for the event,
* and then emit the event under a new name. The new event will contain an additional leading
* parameter containing the item that emitted the original event. Other arguments emitted from
* the original event are passed through.
*
* @param {Object.<string,string|null>} events An object keyed by the name of the event that
* should be aggregated (e.g., ‘click’) and the value of the new name to use
* (e.g., ‘groupClick’). A `null` value will remove aggregated events.
* @throws {Error} If aggregation already exists
*/
OO.EmitterList.prototype.aggregate = function ( events ) {
var i, item;
for ( var itemEvent in events ) {
var groupEvent = events[ itemEvent ];
// Remove existing aggregated event
if ( Object.prototype.hasOwnProperty.call( this.aggregateItemEvents, itemEvent ) ) {
// Don't allow duplicate aggregations
if ( groupEvent ) {
throw new Error( 'Duplicate item event aggregation for ' + itemEvent );
}
// Remove event aggregation from existing items
for ( i = 0; i < this.items.length; i++ ) {
item = this.items[ i ];
if ( item.connect && item.disconnect ) {
var remove = {};
remove[ itemEvent ] = [ 'emit', this.aggregateItemEvents[ itemEvent ], item ];
item.disconnect( this, remove );
}
}
// Prevent future items from aggregating event
delete this.aggregateItemEvents[ itemEvent ];
}
// Add new aggregate event
if ( groupEvent ) {
// Make future items aggregate event
this.aggregateItemEvents[ itemEvent ] = groupEvent;
// Add event aggregation to existing items
for ( i = 0; i < this.items.length; i++ ) {
item = this.items[ i ];
if ( item.connect && item.disconnect ) {
var add = {};
add[ itemEvent ] = [ 'emit', groupEvent, item ];
item.connect( this, add );
}
}
}
}
};
/**
* Add items to the list.
*
* @param {OO.EventEmitter|OO.EventEmitter[]} items Item to add or
* an array of items to add
* @param {number} [index] Index to add items at. If no index is
* given, or if the index that is given is invalid, the item
* will be added at the end of the list.
* @return {OO.EmitterList}
* @fires OO.EmitterList#add
* @fires OO.EmitterList#move
*/
OO.EmitterList.prototype.addItems = function ( items, index ) {
if ( !Array.isArray( items ) ) {
items = [ items ];
}
if ( items.length === 0 ) {
return this;
}
index = normalizeArrayIndex( this.items, index );
for ( var i = 0; i < items.length; i++ ) {
var oldIndex = this.items.indexOf( items[ i ] );
if ( oldIndex !== -1 ) {
// Move item to new index
index = this.moveItem( items[ i ], index );
this.emit( 'move', items[ i ], index, oldIndex );
} else {
// insert item at index
index = this.insertItem( items[ i ], index );
this.emit( 'add', items[ i ], index );
}
index++;
}
return this;
};
/**
* Move an item from its current position to a new index.
*
* The item is expected to exist in the list. If it doesn't,
* the method will throw an exception.
*
* @private
* @param {OO.EventEmitter} item Items to add
* @param {number} newIndex Index to move the item to
* @return {number} The index the item was moved to
* @throws {Error} If item is not in the list
*/
OO.EmitterList.prototype.moveItem = function ( item, newIndex ) {
var existingIndex = this.items.indexOf( item );
if ( existingIndex === -1 ) {
throw new Error( 'Item cannot be moved, because it is not in the list.' );
}
newIndex = normalizeArrayIndex( this.items, newIndex );
// Remove the item from the current index
this.items.splice( existingIndex, 1 );
// If necessary, adjust new index after removal
if ( existingIndex < newIndex ) {
newIndex--;
}
// Move the item to the new index
this.items.splice( newIndex, 0, item );
return newIndex;
};
/**
* Utility method to insert an item into the list, and
* connect it to aggregate events.
*
* Don't call this directly unless you know what you're doing.
* Use #addItems instead.
*
* This method can be extended in child classes to produce
* different behavior when an item is inserted. For example,
* inserted items may also be attached to the DOM or may
* interact with some other nodes in certain ways. Extending
* this method is allowed, but if overridden, the aggregation
* of events must be preserved, or behavior of emitted events
* will be broken.
*
* If you are extending this method, please make sure the
* parent method is called.
*
* @protected
* @param {OO.EventEmitter|Object} item Item to add
* @param {number} index Index to add items at
* @return {number} The index the item was added at
*/
OO.EmitterList.prototype.insertItem = function ( item, index ) {
// Throw an error if null or item is not an object.
if ( item === null || typeof item !== 'object' ) {
throw new Error( 'Expected object, but item is ' + typeof item );
}
// Add the item to event aggregation
if ( item.connect && item.disconnect ) {
var events = {};
for ( var event in this.aggregateItemEvents ) {
events[ event ] = [ 'emit', this.aggregateItemEvents[ event ], item ];
}
item.connect( this, events );
}
index = normalizeArrayIndex( this.items, index );
// Insert into items array
this.items.splice( index, 0, item );
return index;
};
/**
* Remove items.
*
* @param {OO.EventEmitter|OO.EventEmitter[]} items Items to remove
* @return {OO.EmitterList}
* @fires OO.EmitterList#remove
*/
OO.EmitterList.prototype.removeItems = function ( items ) {
if ( !Array.isArray( items ) ) {
items = [ items ];
}
if ( items.length === 0 ) {
return this;
}
// Remove specific items
for ( var i = 0; i < items.length; i++ ) {
var item = items[ i ];
var index = this.items.indexOf( item );
if ( index !== -1 ) {
if ( item.connect && item.disconnect ) {
// Disconnect all listeners from the item
item.disconnect( this );
}
this.items.splice( index, 1 );
this.emit( 'remove', item, index );
}
}
return this;
};
/**
* Clear all items.
*
* @return {OO.EmitterList}
* @fires OO.EmitterList#clear
*/
OO.EmitterList.prototype.clearItems = function () {
var cleared = this.items.splice( 0, this.items.length );
// Disconnect all items
for ( var i = 0; i < cleared.length; i++ ) {
var item = cleared[ i ];
if ( item.connect && item.disconnect ) {
item.disconnect( this );
}
}
this.emit( 'clear' );
return this;
};
}() );
/**
* Manage a sorted list of OO.EmitterList objects.
*
* The sort order is based on a callback that compares two items. The return value of
* callback( a, b ) must be less than zero if a < b, greater than zero if a > b, and zero
* if a is equal to b. The callback should only return zero if the two objects are
* considered equal.
*
* When an item changes in a way that could affect their sorting behavior, it must
* emit the {@link OO.SortedEmitterList#event:itemSortChange itemSortChange} event.
* This will cause it to be re-sorted automatically.
*
* This mixin must be used in a class that also mixes in {@link OO.EventEmitter}.
*
* @abstract
* @class
* @mixes OO.EmitterList
* @param {Function} sortingCallback Callback that compares two items.
*/
OO.SortedEmitterList = function OoSortedEmitterList( sortingCallback ) {
// Mixin constructors
OO.EmitterList.call( this );
this.sortingCallback = sortingCallback;
// Listen to sortChange event and make sure
// we re-sort the changed item when that happens
this.aggregate( {
sortChange: 'itemSortChange'
} );
this.connect( this, {
itemSortChange: 'onItemSortChange'
} );
};
OO.mixinClass( OO.SortedEmitterList, OO.EmitterList );
/* Events */
/**
* An item has changed properties that affect its sort positioning
* inside the list.
*
* @private
* @event OO.SortedEmitterList#itemSortChange
*/
/* Methods */
/**
* Handle a case where an item changed a property that relates
* to its sorted order.
*
* @param {OO.EventEmitter} item Item in the list
*/
OO.SortedEmitterList.prototype.onItemSortChange = function ( item ) {
// Remove the item
this.removeItems( item );
// Re-add the item so it is in the correct place
this.addItems( item );
};
/**
* Change the sorting callback for this sorted list.
*
* The callback receives two items. The return value of callback(a, b) must be less than zero
* if a < b, greater than zero if a > b, and zero if a is equal to b.
*
* @param {Function} sortingCallback Sorting callback
*/
OO.SortedEmitterList.prototype.setSortingCallback = function ( sortingCallback ) {
var items = this.getItems();
this.sortingCallback = sortingCallback;
// Empty the list
this.clearItems();
// Re-add the items in the new order
this.addItems( items );
};
/**
* Add items to the sorted list.
*
* @param {OO.EventEmitter|OO.EventEmitter[]} items Item to add or
* an array of items to add
* @return {OO.SortedEmitterList}
*/
OO.SortedEmitterList.prototype.addItems = function ( items ) {
if ( !Array.isArray( items ) ) {
items = [ items ];
}
if ( items.length === 0 ) {
return this;
}
for ( var i = 0; i < items.length; i++ ) {
// Find insertion index
var insertionIndex = this.findInsertionIndex( items[ i ] );
// Check if the item exists using the sorting callback
// and remove it first if it exists
if (
// First make sure the insertion index is not at the end
// of the list (which means it does not point to any actual
// items)
insertionIndex <= this.items.length &&
// Make sure there actually is an item in this index
this.items[ insertionIndex ] &&
// The callback returns 0 if the items are equal
this.sortingCallback( this.items[ insertionIndex ], items[ i ] ) === 0
) {
// Remove the existing item
this.removeItems( this.items[ insertionIndex ] );
}
// Insert item at the insertion index
var index = this.insertItem( items[ i ], insertionIndex );
this.emit( 'add', items[ i ], index );
}
return this;
};
/**
* Find the index a given item should be inserted at. If the item is already
* in the list, this will return the index where the item currently is.
*
* @param {OO.EventEmitter} item Items to insert
* @return {number} The index the item should be inserted at
*/
OO.SortedEmitterList.prototype.findInsertionIndex = function ( item ) {
var list = this;
return OO.binarySearch(
this.items,
// Fake a this.sortingCallback.bind( null, item ) call here
// otherwise this doesn't pass tests in phantomJS
function ( otherItem ) {
return list.sortingCallback( item, otherItem );
},
true
);
};
/* global hasOwn */
/**
* A map interface for associating arbitrary data with a symbolic name. Used in
* place of a plain object to provide additional {@link OO.Registry#register registration}
* or {@link OO.Registry#lookup lookup} functionality.
*
* See <https://www.mediawiki.org/wiki/OOjs/Registries_and_factories>.
*
* @class
* @mixes OO.EventEmitter
*/
OO.Registry = function OoRegistry() {
// Mixin constructors
OO.EventEmitter.call( this );
// Properties
this.registry = {};
};
/* Inheritance */
OO.mixinClass( OO.Registry, OO.EventEmitter );
/* Events */
/**
* @event OO.Registry#register
* @param {string} name
* @param {any} data
*/
/**
* @event OO.Registry#unregister
* @param {string} name
* @param {any} data Data removed from registry
*/
/* Methods */
/**
* Associate one or more symbolic names with some data.
*
* Any existing entry with the same name will be overridden.
*
* @param {string|string[]} name Symbolic name or list of symbolic names
* @param {any} data Data to associate with symbolic name
* @fires OO.Registry#register
* @throws {Error} Name argument must be a string or array
*/
OO.Registry.prototype.register = function ( name, data ) {
if ( typeof name === 'string' ) {
this.registry[ name ] = data;
this.emit( 'register', name, data );
} else if ( Array.isArray( name ) ) {
for ( var i = 0, len = name.length; i < len; i++ ) {
this.register( name[ i ], data );
}
} else {
throw new Error( 'Name must be a string or array, cannot be a ' + typeof name );
}
};
/**
* Remove one or more symbolic names from the registry.
*
* @param {string|string[]} name Symbolic name or list of symbolic names
* @fires OO.Registry#unregister
* @throws {Error} Name argument must be a string or array
*/
OO.Registry.prototype.unregister = function ( name ) {
if ( typeof name === 'string' ) {
var data = this.lookup( name );
if ( data !== undefined ) {
delete this.registry[ name ];
this.emit( 'unregister', name, data );
}
} else if ( Array.isArray( name ) ) {
for ( var i = 0, len = name.length; i < len; i++ ) {
this.unregister( name[ i ] );
}
} else {
throw new Error( 'Name must be a string or array, cannot be a ' + typeof name );
}
};
/**
* Get data for a given symbolic name.
*
* @param {string} name Symbolic name
* @return {any|undefined} Data associated with symbolic name
*/
OO.Registry.prototype.lookup = function ( name ) {
if ( hasOwn.call( this.registry, name ) ) {
return this.registry[ name ];
}
};
/**
* @class
* @extends OO.Registry
*/
OO.Factory = function OoFactory() {
// Parent constructor
OO.Factory.super.call( this );
};
/* Inheritance */
OO.inheritClass( OO.Factory, OO.Registry );
/* Methods */
/**
* Register a class with the factory.
*
* function MyClass() {};
* OO.initClass( MyClass );
* MyClass.key = 'hello';
*
* // Register class with the factory
* factory.register( MyClass );
*
* // Instantiate a class based on its registered key (also known as a "symbolic name")
* factory.create( 'hello' );
*
* @param {Function} constructor Class to use when creating an object
* @param {string} [key] The key for #create().
* This parameter is usually omitted in favour of letting the class declare
* its own key, through `MyClass.key`.
* For backwards-compatiblity with OOjs 6.0 (2021) and older, it can also be declared
* via `MyClass.static.name`.
* @throws {Error} If a parameter is invalid
*/
OO.Factory.prototype.register = function ( constructor, key ) {
if ( typeof constructor !== 'function' ) {
throw new Error( 'constructor must be a function, got ' + typeof constructor );
}
if ( arguments.length <= 1 ) {
key = constructor.key || ( constructor.static && constructor.static.name );
}
if ( typeof key !== 'string' || key === '' ) {
throw new Error( 'key must be a non-empty string' );
}
// Parent method
OO.Factory.super.prototype.register.call( this, key, constructor );
};
/**
* Unregister a class from the factory.
*
* @param {string|Function} key Constructor function or key to unregister
* @throws {Error} If a parameter is invalid
*/
OO.Factory.prototype.unregister = function ( key ) {
if ( typeof key === 'function' ) {
key = key.key || ( key.static && key.static.name );
}
if ( typeof key !== 'string' || key === '' ) {
throw new Error( 'key must be a non-empty string' );
}
// Parent method
OO.Factory.super.prototype.unregister.call( this, key );
};
/**
* Create an object based on a key.
*
* The key is used to look up the class to use, with any subsequent arguments passed to the
* constructor function.
*
* @param {string} key Class key
* @param {...any} [args] Arguments to pass to the constructor
* @return {Object} The new object
* @throws {Error} Unknown key
*/
OO.Factory.prototype.create = function ( key, ...args ) {
var constructor = this.lookup( key );
if ( !constructor ) {
throw new Error( 'No class registered by that key: ' + key );
}
return new constructor( ...args );
};
/* eslint-env node */
/* istanbul ignore next */
if ( typeof module !== 'undefined' && module.exports ) {
module.exports = OO;
} else {
global.OO = OO;
}
}( this ) );

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