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* @license Apache-2.0
*
* Copyright (c) 2025 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* eslint-disable no-restricted-syntax, no-invalid-this */
'use strict';
// MODULES //
var objectKeys = require( '@stdlib/utils/keys' );
var setNonEnumerableReadOnly = require( '@stdlib/utils/define-nonenumerable-read-only-property' );
var hasOwnProp = require( '@stdlib/assert/has-own-property' );
var format = require( '@stdlib/string/format' );
var deepCopy = require( '@stdlib/utils/copy' );
var contains = require( '@stdlib/array/base/assert/contains' ).factory;
var validateKeybindings = require( './validate_keybindings.js' );
var ACTIONS = require( './actions.js' );
// VARIABLES //
var REPLACER = [ 'name', 'ctrl', 'shift', 'meta' ];
var isAction = contains( ACTIONS );
// MAIN //
/**
* Keybindings constructor.
*
* @private
* @constructor
* @param {Object} keybindings - keybindings object
* @throws {TypeError} each key must correspond to a single action
* @returns {Keybindings} keybindings instance
*/
function Keybindings( keybindings ) {
var actions;
var action;
var keys;
var key;
var i;
var j;
if ( !( this instanceof Keybindings ) ) {
return new Keybindings( keybindings );
}
// Initialize internal variables to store keybindings:
this._action2Keys = keybindings;
this._key2Action = {};
// Create a hash table of keybindings:
actions = objectKeys( keybindings );
for ( i = 0; i < actions.length; i++ ) {
action = actions[ i ];
keys = keybindings[ action ];
for ( j = 0; j < keys.length; j++ ) {
key = JSON.stringify( keys[ j ], REPLACER );
if ( hasOwnProp( this._key2Action, key ) ) {
throw new TypeError( format( 'invalid argument. Each key in the keybindings argument must correspond to a single action. Value: `%s`', key ) );
}
this._key2Action[ key ] = action;
}
}
return this;
}
/**
* Sets a keybinding.
*
* @private
* @name set
* @memberof Keybindings.prototype
* @type {Function}
* @param {string} action - action name
* @param {Array<Object>} keys - list of keys
* @throws {TypeError} first argument must be a valid action name
* @throws {TypeError} second argument must be an array of valid keys corresponding to a single action
* @returns {void}
*/
setNonEnumerableReadOnly( Keybindings.prototype, 'set', function set( action, keys ) {
var validatedKeys;
var JSONKeys;
var key;
var obj;
var out;
var err;
var i;
if ( !isAction( action ) ) {
throw new TypeError( format( 'invalid argument. First argument must be a valid action name. Value: `%s`.', action ) );
}
// Validate provided keys:
obj = {};
out = {};
obj[ action ] = keys;
err = validateKeybindings( out, obj );
if ( err ) {
throw err;
}
// Check for collisions in existing hash table:
JSONKeys = [];
validatedKeys = out[ action ];
for ( i = 0; i < validatedKeys.length; i++ ) {
key = JSON.stringify( validatedKeys[ i ], REPLACER );
if ( hasOwnProp( this._key2Action, key ) ) {
throw new TypeError( format( 'invalid argument. Each key in the keys argument must correspond to a single action. Value: `%s`', key ) );
}
JSONKeys.push( key );
}
// Update hash table:
for ( i = 0; i < JSONKeys.length; i++ ) {
this._key2Action[ JSONKeys[ i ] ] = action;
}
this._action2Keys[ action ] = validatedKeys;
});
/**
* Gets action name corresponding to the specified key.
*
* @private
* @name getAction
* @memberof Keybindings.prototype
* @type {Function}
* @param {Object} key
* @returns {(string|null)} action name
*/
setNonEnumerableReadOnly( Keybindings.prototype, 'getAction', function getAction( key ) {
var serializedKey = JSON.stringify( key, REPLACER );
if ( !hasOwnProp( this._key2Action, serializedKey ) ) {
return null;
}
return this._key2Action[ serializedKey ];
});
/**
* Lists all keybindings.
*
* @private
* @name list
* @memberof Keybindings.prototype
* @type {Function}
* @returns {Object} keybindings object
*/
setNonEnumerableReadOnly( Keybindings.prototype, 'list', function list() {
return deepCopy( this._action2Keys );
});
// EXPORTS //
module.exports = Keybindings;
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