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tunnckoCore
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,47 +1,59 @@ | ||
| /** Mitt: Tiny (~200b) functional event emitter / pubsub. | ||
| * @name mitt | ||
| * @returns {Mitt} | ||
| * @name mitt | ||
| * @returns {Mitt} | ||
| */ | ||
| export default function mitt(all) { | ||
| // Arrays of event handlers, keyed by type | ||
| all = all || {}; | ||
| export default function mitt () { | ||
| let ret = { | ||
| all: Object.create(null), | ||
|
|
||
| // Get or create a named handler list | ||
| function list(type) { | ||
| let t = type.toLowerCase(); | ||
| return all[t] || (all[t] = []); | ||
| } | ||
| /** | ||
| * Register an event handler for the given type. | ||
| * | ||
| * @param {String} type Type of event to listen for, or `"*"` for all events | ||
| * @param {Function} handler Function to call in response to given event | ||
| * @return {Object} the `mitt` instance for chaining | ||
| * @memberOf mitt | ||
| */ | ||
| on(type, handler) { | ||
| list(type).add(handler); | ||
| return ret; | ||
| }, | ||
|
|
||
| return { | ||
| /** | ||
| * Remove an event handler for the given type. | ||
| * | ||
| * @param {String} type Type of event to unregister `handler` from, or `"*"` | ||
| * @param {Function} handler Handler function to remove | ||
| * @return {Object} the `mitt` instance for chaining | ||
| * @memberOf mitt | ||
| */ | ||
| off(type, handler) { | ||
| list(type).delete(handler); | ||
| return ret; | ||
| }, | ||
|
|
||
| /** Register an event handler for the given type. | ||
| * @param {String} type Type of event to listen for, or `"*"` for all events | ||
| * @param {Function} handler Function to call in response to the given event | ||
| * @memberof mitt | ||
| */ | ||
| on(type, handler) { | ||
| list(type).push(handler); | ||
| }, | ||
| /** | ||
| * Invoke all handlers for the given type. | ||
| * If present, `"*"` handlers are invoked prior to type-matched handlers. | ||
| * | ||
| * @param {String} type The event type to invoke | ||
| * @param {Any} [arg1] A value (first argument), passed to each handler | ||
| * @param {Any} [arg2] A value (second argument), passed to each handler | ||
| * @param {Any} [arg3] A value (third argument), passed to each handler | ||
| * @return {Object} the `mitt` instance for chaining | ||
| * @memberof mitt | ||
| */ | ||
| emit(type, arg1, arg2, arg3) { | ||
| list(type).forEach((handler) => handler(arg1, arg2, arg3)); | ||
| list('*').forEach((handler) => handler(type, arg1, arg2, arg3)); | ||
| return ret; | ||
| } | ||
| }; | ||
|
|
||
| /** Remove an event handler for the given type. | ||
| * @param {String} type Type of event to unregister `handler` from, or `"*"` | ||
| * @param {Function} handler Handler function to remove | ||
| * @memberof mitt | ||
| */ | ||
| off(type, handler) { | ||
| let e = list(type), | ||
| i = e.indexOf(handler); | ||
| if (~i) e.splice(i, 1); | ||
| }, | ||
| // Get or create a named handler list | ||
| let list = (type) => { | ||
| return ret.all[type = type.toLowerCase()] || (ret.all[type] = new Set()); | ||
| }; | ||
|
|
||
| /** Invoke all handlers for the given type. | ||
| * If present, `"*"` handlers are invoked prior to type-matched handlers. | ||
| * @param {String} type The event type to invoke | ||
| * @param {Any} [event] An event object, passed to each handler | ||
| * @memberof mitt | ||
| */ | ||
| emit(type, event) { | ||
| list('*').concat(list(type)).forEach( f => { f(event); }); | ||
| } | ||
| }; | ||
| return ret; | ||
| } |
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