aboutsummaryrefslogtreecommitdiff
path: root/ext/js/input/hotkey-util.js
blob: ea3daf977e9011ad26d00a8db1465af7ee3ece56 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
/*
 * Copyright (C) 2021  Yomichan Authors
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

/**
 * Utility class to help display hotkeys and convert to/from commands.
 */
class HotkeyUtil {
    /**
     * Creates a new instance.
     */
    constructor(os=null) {
        this._os = os;
        this._inputSeparator = ' + ';
        this._modifierKeyNames = new Map();
        this._mouseInputNamePattern = /^mouse(\d+)$/;
        this._modifierPriorities = new Map([
            ['meta', -4],
            ['ctrl', -3],
            ['alt', -2],
            ['shift', -1]
        ]);
        this._stringComparer = new Intl.Collator('en-US'); // Invariant locale

        this._updateModifierKeyNames();
    }

    /**
     * Gets the operating system for this instance.
     * The operating system is used to display system-localized modifier key names.
     */
    get os() {
        return this._os;
    }

    /**
     * Sets the operating system for this instance.
     * @param value The value to assign.
     *   Valid values are: win, mac, linux, openbsd, cros, android.
     */
    set os(value) {
        if (this._os === value) { return; }
        this._os = value;
        this._updateModifierKeyNames();
    }

    /**
     * Gets a display string for a key and a set of modifiers.
     * @param key The key code string, or `null` for no key.
     * @param modifiers An array of modifiers.
     *   Valid values are: ctrl, alt, shift, meta, or mouseN, where N is an integer.
     * @returns A user-friendly string for the combination of key and modifiers.
     */
    getInputDisplayValue(key, modifiers) {
        const separator = this._inputSeparator;
        let displayValue = '';
        let first = true;
        for (const modifier of modifiers) {
            if (first) {
                first = false;
            } else {
                displayValue += separator;
            }
            displayValue += this.getModifierDisplayValue(modifier);
        }
        if (typeof key === 'string') {
            if (!first) { displayValue += separator; }
            displayValue += this.getKeyDisplayValue(key);
        }
        return displayValue;
    }

    /**
     * Gets a display string for a single modifier.
     * @param modifier A string representing a modifier.
     *   Valid values are: ctrl, alt, shift, meta, or mouseN, where N is an integer.
     * @returns A user-friendly string for the modifier.
     */
    getModifierDisplayValue(modifier) {
        const match = this._mouseInputNamePattern.exec(modifier);
        if (match !== null) {
            return `Mouse ${match[1]}`;
        }

        const name = this._modifierKeyNames.get(modifier);
        return (typeof name !== 'undefined' ? name : modifier);
    }

    /**
     * Gets a display string for a key.
     * @param key The key code string, or `null` for no key.
     * @returns A user-friendly string for the combination of key and modifiers, or `null` if key was already `null`.
     */
    getKeyDisplayValue(key) {
        if (typeof key === 'string' && key.length === 4 && key.startsWith('Key')) {
            key = key.substring(3);
        }
        return key;
    }

    /**
     * Gets a display string for a single modifier.
     * @param modifier A string representing a modifier.
     *   Valid values are: ctrl, alt, shift, meta, or mouseN, where N is an integer.
     * @returns `'mouse'` if the modifier represents a mouse button, `'key'` otherwise.
     */
    getModifierType(modifier) {
        return (this._mouseInputNamePattern.test(modifier) ? 'mouse' : 'key');
    }

    /**
     * Converts an extension command string into a standard input.
     * @param command An extension command string.
     * @returns An object `{key, modifiers}`, where key is a string (or `null`) representing the key, and modifiers is an array of modifier keys.
     */
    convertCommandToInput(command) {
        let key = null;
        const modifiers = new Set();
        if (typeof command === 'string' && command.length > 0) {
            const parts = command.split('+');
            const ii = parts.length - 1;
            key = this._convertCommandKeyToInputKey(parts[ii]);
            for (let i = 0; i < ii; ++i) {
                modifiers.add(this._convertCommandModifierToInputModifier(parts[i]));
            }
        }
        return {key, modifiers: this.sortModifiers([...modifiers])};
    }

    /**
     * Gets a command string for a specified input.
     * @param key The key code string, or `null` for no key.
     * @param modifiers An array of modifier keys.
     *   Valid values are: ctrl, alt, shift, meta.
     * @returns An extension command string representing the input.
     */
    convertInputToCommand(key, modifiers) {
        const separator = '+';
        let command = '';
        let first = true;
        for (const modifier of modifiers) {
            if (first) {
                first = false;
            } else {
                command += separator;
            }
            command += this._convertInputModifierToCommandModifier(modifier);
        }
        if (typeof key === 'string') {
            if (!first) { command += separator; }
            command += this._convertInputKeyToCommandKey(key);
        }
        return command;
    }

    /**
     * Sorts an array of modifiers.
     * @param modifiers An array of modifiers.
     *   Valid values are: ctrl, alt, shift, meta.
     * @returns A sorted array of modifiers. The array instance is the same as the input array.
     */
    sortModifiers(modifiers) {
        const pattern = this._mouseInputNamePattern;
        const keyPriorities = this._modifierPriorities;
        const stringComparer = this._stringComparer;

        const count = modifiers.length;
        const modifierInfos = [];
        for (let i = 0; i < count; ++i) {
            const modifier = modifiers[i];
            const match = pattern.exec(modifier);
            let info;
            if (match !== null) {
                info = [modifier, 1, Number.parseInt(match[1], 10), i];
            } else {
                let priority = keyPriorities.get(modifier);
                if (typeof priority === 'undefined') { priority = 0; }
                info = [modifier, 0, priority, i];
            }
            modifierInfos.push(info);
        }

        modifierInfos.sort((a, b) => {
            let i = a[1] - b[1];
            if (i !== 0) { return i; }

            i = a[2] - b[2];
            if (i !== 0) { return i; }

            i = stringComparer.compare(a[0], b[0]);
            if (i !== 0) { return i; }

            i = a[3] - b[3];
            return i;
        });

        for (let i = 0; i < count; ++i) {
            modifiers[i] = modifierInfos[i][0];
        }

        return modifiers;
    }

    // Private

    _getModifierKeyNames(os) {
        switch (os) {
            case 'win':
                return [
                    ['alt', 'Alt'],
                    ['ctrl', 'Ctrl'],
                    ['shift', 'Shift'],
                    ['meta', 'Windows']
                ];
            case 'mac':
                return [
                    ['alt', 'Opt'],
                    ['ctrl', 'Ctrl'],
                    ['shift', 'Shift'],
                    ['meta', 'Cmd']
                ];
            case 'linux':
            case 'openbsd':
            case 'cros':
            case 'android':
                return [
                    ['alt', 'Alt'],
                    ['ctrl', 'Ctrl'],
                    ['shift', 'Shift'],
                    ['meta', 'Super']
                ];
            default: // 'unknown', etc
                return [
                    ['alt', 'Alt'],
                    ['ctrl', 'Ctrl'],
                    ['shift', 'Shift'],
                    ['meta', 'Meta']
                ];
        }
    }

    _updateModifierKeyNames() {
        const map = this._modifierKeyNames;
        map.clear();
        for (const [key, value] of this._getModifierKeyNames(this._os)) {
            map.set(key, value);
        }
    }

    _convertCommandKeyToInputKey(key) {
        if (key.length === 1) {
            key = `Key${key}`;
        }
        return key;
    }

    _convertCommandModifierToInputModifier(modifier) {
        switch (modifier) {
            case 'Ctrl': return (this._os === 'mac' ? 'meta' : 'ctrl');
            case 'Alt': return 'alt';
            case 'Shift': return 'shift';
            case 'MacCtrl': return 'ctrl';
            case 'Command': return 'meta';
            default: return modifier;
        }
    }

    _convertInputKeyToCommandKey(key) {
        if (key.length === 4 && key.startsWith('Key')) {
            key = key.substring(3);
        }
        return key;
    }

    _convertInputModifierToCommandModifier(modifier) {
        switch (modifier) {
            case 'ctrl': return (this._os === 'mac' ? 'MacCtrl' : 'Ctrl');
            case 'alt': return 'Alt';
            case 'shift': return 'Shift';
            case 'meta': return 'Command';
            default: return modifier;
        }
    }
}