refactor(frontend): scripts -> utility

1 files changed, 153 insertions, 0 deletions

diff --git a/packages/frontend/src/utility/key-event.ts b/packages/frontend/src/utility/key-event.ts
new file mode 100644
index 0000000000..020a6c2174
--- /dev/null
+++ b/packages/frontend/src/utility/key-event.ts
@@ -0,0 +1,153 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+/**
+ * {@link KeyboardEvent.code} の値を表す文字列。不足分は適宜追加する
+ * @see https://developer.mozilla.org/en-US/docs/Web/API/UI_Events/Keyboard_event_code_values
+ */
+export type KeyCode = (
+	| 'Backspace'
+	| 'Tab'
+	| 'Enter'
+	| 'Shift'
+	| 'Control'
+	| 'Alt'
+	| 'Pause'
+	| 'CapsLock'
+	| 'Escape'
+	| 'Space'
+	| 'PageUp'
+	| 'PageDown'
+	| 'End'
+	| 'Home'
+	| 'ArrowLeft'
+	| 'ArrowUp'
+	| 'ArrowRight'
+	| 'ArrowDown'
+	| 'Insert'
+	| 'Delete'
+	| 'Digit0'
+	| 'Digit1'
+	| 'Digit2'
+	| 'Digit3'
+	| 'Digit4'
+	| 'Digit5'
+	| 'Digit6'
+	| 'Digit7'
+	| 'Digit8'
+	| 'Digit9'
+	| 'KeyA'
+	| 'KeyB'
+	| 'KeyC'
+	| 'KeyD'
+	| 'KeyE'
+	| 'KeyF'
+	| 'KeyG'
+	| 'KeyH'
+	| 'KeyI'
+	| 'KeyJ'
+	| 'KeyK'
+	| 'KeyL'
+	| 'KeyM'
+	| 'KeyN'
+	| 'KeyO'
+	| 'KeyP'
+	| 'KeyQ'
+	| 'KeyR'
+	| 'KeyS'
+	| 'KeyT'
+	| 'KeyU'
+	| 'KeyV'
+	| 'KeyW'
+	| 'KeyX'
+	| 'KeyY'
+	| 'KeyZ'
+	| 'MetaLeft'
+	| 'MetaRight'
+	| 'ContextMenu'
+	| 'F1'
+	| 'F2'
+	| 'F3'
+	| 'F4'
+	| 'F5'
+	| 'F6'
+	| 'F7'
+	| 'F8'
+	| 'F9'
+	| 'F10'
+	| 'F11'
+	| 'F12'
+	| 'NumLock'
+	| 'ScrollLock'
+	| 'Semicolon'
+	| 'Equal'
+	| 'Comma'
+	| 'Minus'
+	| 'Period'
+	| 'Slash'
+	| 'Backquote'
+	| 'BracketLeft'
+	| 'Backslash'
+	| 'BracketRight'
+	| 'Quote'
+	| 'Meta'
+	| 'AltGraph'
+);
+
+/**
+ * 修飾キーを表す文字列。不足分は適宜追加する。
+ */
+export type KeyModifier = (
+	| 'Shift'
+	| 'Control'
+	| 'Alt'
+	| 'Meta'
+);
+
+/**
+ * 押下されたキー以外の状態を表す文字列。不足分は適宜追加する。
+ */
+export type KeyState = (
+	| 'composing'
+	| 'repeat'
+);
+
+export type KeyEventHandler = {
+	modifiers?: KeyModifier[];
+	states?: KeyState[];
+	code: KeyCode | 'any';
+	handler: (event: KeyboardEvent) => void;
+};
+
+export function handleKeyEvent(event: KeyboardEvent, handlers: KeyEventHandler[]) {
+	function checkModifier(ev: KeyboardEvent, modifiers? : KeyModifier[]) {
+		if (modifiers) {
+			return modifiers.every(modifier => ev.getModifierState(modifier));
+		}
+		return true;
+	}
+
+	function checkState(ev: KeyboardEvent, states?: KeyState[]) {
+		if (states) {
+			return states.every(state => ev.getModifierState(state));
+		}
+		return true;
+	}
+
+	let hit = false;
+	for (const handler of handlers.filter(it => it.code === event.code)) {
+		if (checkModifier(event, handler.modifiers) && checkState(event, handler.states)) {
+			handler.handler(event);
+			hit = true;
+			break;
+		}
+	}
+
+	if (!hit) {
+		for (const handler of handlers.filter(it => it.code === 'any')) {
+			handler.handler(event);
+		}
+	}
+}