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* @license Apache-2.0
*
* Copyright (c) 2024 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.
*/
'use strict';
// MODULES //
var hasOwnProp = require( '@stdlib/assert/has-own-property' );
var pick = require( '@stdlib/utils/pick' );
var containsFactory = require( '@stdlib/array/base/assert/contains' ).factory;
var isUndefined = require( '@stdlib/assert/is-undefined' );
// VARIABLES //
// Control sequence prefix in ALT combinations:
var ALT_CSI = '\u001B';
// Properties in parsed keybinding:
var KEYBINDING_PROPS = [ 'name', 'ctrl', 'shift', 'meta' ];
/**
* Asserts if a sequence is an unrecognized symbol.
*
* ## Notes
*
* - `SHIFT+<symbol>` will result in a keybinding with the name of the resulting symbol and not the original symbol with shift enabled.
*
* @private
* @name isUnrecognizedSymbol
* @type {Function}
*/
var isUnrecognizedSymbol = containsFactory([
'`',
'~',
'!',
'@',
'#',
'$',
'%',
'^',
'&',
'*',
'(',
')',
'-',
'_',
'=',
'+',
'{',
'}',
'[',
']',
'|',
'\\',
':',
';',
'"',
'\'',
'<',
',',
'>',
'.',
'?',
'/'
]);
/**
* Table mapping unrecognized control sequences to their possible key objects.
*
* ## Notes
*
* - The following map is recorded as observed in gnome.
*
* @private
* @name CTRL_SEQUENCES_KEYMAP
* @type {Object}
*/
var CTRL_SEQUENCES_KEYMAP = {
'\u001F': [
{
'name': '/',
'ctrl': true,
'shift': false,
'meta': false
},
{
'name': '-',
'ctrl': true,
'shift': false,
'meta': true
},
{
'name': '7',
'ctrl': true,
'shift': false,
'meta': true
}
],
'\u001C': [
{
'name': '\\',
'ctrl': true,
'shift': false,
'meta': false
},
{
'name': '\\',
'ctrl': true,
'shift': true,
'meta': false
},
{
'name': '|',
'ctrl': true,
'shift': false,
'meta': false
},
{
'name': '4',
'ctrl': true,
'shift': false,
'meta': false
}
],
'\u001D': [
{
'name': ']',
'ctrl': true,
'shift': false,
'meta': false
},
{
'name': ']',
'ctrl': true,
'shift': true,
'meta': false
},
{
'name': '}',
'ctrl': true,
'shift': false,
'meta': false
},
{
'name': '5',
'ctrl': true,
'shift': false,
'meta': false
}
],
'\u001E': [
{
'name': '6',
'ctrl': true,
'shift': false,
'meta': false
},
{
'name': '6',
'ctrl': true,
'shift': true,
'meta': false
},
{
'name': '^',
'ctrl': true,
'shift': false,
'meta': false
}
]
};
// FUNCTIONS //
/**
* Parses unrecognized control sequences emitted by `ALT+<symbol>` combinations.
*
* @private
* @param {string} seq - control sequence
* @returns {(Object|null)} parsed key object or null if not a meta symbol sequence
*/
function parseMetaSymbolSequence( seq ) {
if (
!seq ||
seq.length !== 2 ||
seq[ 0 ] !== ALT_CSI ||
isUnrecognizedSymbol( seq[ 1 ] )
) {
return null;
}
return {
'name': seq[ 1 ],
'ctrl': false,
'shift': false,
'meta': true
};
}
// MAIN //
/**
* Parses a readline keypress object.
*
* @param {Object} key - readline keypress object
* @returns {Array<Object>} list of possible key objects
*/
function parseKey( key ) {
var out;
var seq;
// If key is already defined, no need to parse it...
if ( !isUndefined( key.name ) ) {
return [ pick( key, KEYBINDING_PROPS ) ];
}
seq = key.sequence;
// Check if it's an unrecognized symbol:
if ( isUnrecognizedSymbol( seq ) ) {
return [
{
'name': seq,
'ctrl': false,
'shift': false,
'meta': false
}
];
}
// Check if it's a `CTRL+<symbol>` combination:
if ( hasOwnProp( CTRL_SEQUENCES_KEYMAP, seq ) ) {
return CTRL_SEQUENCES_KEYMAP[ seq ];
}
// Check if it's a `META+<symbol>` combination:
out = parseMetaSymbolSequence( seq );
if ( out ) {
return [ out ];
}
return [ pick( key, KEYBINDING_PROPS ) ]; // couldn't parse, return original key
}
// EXPORTS //
module.exports = parseKey;
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