feat: Cmd+Backspace / Alt+Backspace 삭제 단축키 (#260)

rhwp-studio/src/engine/input-handler-keyboard.ts

@@ -680,18 +680,26 @@ export function onKeyDown(this: any, e: KeyboardEvent): void {
   }
 
   // Alt 조합 단축키 처리
-  if (e.altKey && this.dispatcher) {
+  if (e.altKey) {
+    // Alt+Backspace → 단어 단위 삭제 (macOS Option+Delete)
+    if (e.key === 'Backspace' && !e.ctrlKey && !e.metaKey) {
+      e.preventDefault();
+      deleteWordBackward.call(this);
+      return;
+    }
     // Alt+V → Chord 대기 (보기 메뉴 단축키, 한컴 Alt+V,T 계승)
     if ((e.key === 'v' || e.key === 'V' || e.key === 'ㅍ') && !e.shiftKey && !e.ctrlKey) {
       e.preventDefault();
       this._pendingChordV = true;
       return;
     }
-    const cmdId = matchShortcut(e, defaultShortcuts);
-    if (cmdId) {
-      e.preventDefault();
-      this.dispatcher.dispatch(cmdId);
-      return;
+    if (this.dispatcher) {
+      const cmdId = matchShortcut(e, defaultShortcuts);
+      if (cmdId) {
+        e.preventDefault();
+        this.dispatcher.dispatch(cmdId);
+        return;
+      }
     }
   }
 
@@ -892,8 +900,17 @@ export function handleCtrlKey(this: any, e: KeyboardEvent): void {
     return;
   }
 
-  // 커맨드 시스템에 없는 직접 처리 (Ctrl+Home/End 등 커서 이동)
+  // 커맨드 시스템에 없는 직접 처리 (Ctrl+Home/End, Ctrl+Backspace 등)
   switch (e.key.toLowerCase()) {
+    case 'backspace': {
+      e.preventDefault();
+      if (e.metaKey) {
+        deleteToLineStart.call(this);
+      } else {
+        deleteWordBackward.call(this);
+      }
+      break;
+    }
     case 'home': {
       e.preventDefault();
       if (e.shiftKey) {
@@ -930,6 +947,64 @@ export function handleSelectAll(this: any): void {
   this.updateCaret();
 }
 
+/** Cmd+Backspace (macOS): 현재 위치에서 줄 시작까지 삭제 */
+function deleteToLineStart(this: any): void {
+  if (this.cursor.hasSelection()) {
+    this.deleteSelection();
+    return;
+  }
+  this.cursor.setAnchor();
+  this.cursor.moveToLineStart();
+  if (this.cursor.hasSelection()) {
+    this.deleteSelection();
+  }
+}
+
+/** Ctrl+Backspace (Win/Linux) / Alt+Backspace (macOS): 이전 단어 경계까지 삭제 */
+function deleteWordBackward(this: any): void {
+  if (this.cursor.hasSelection()) {
+    this.deleteSelection();
+    return;
+  }
+  const pos = this.cursor.getPosition();
+  const inCell = this.cursor.isInCell();
+  const charOffset = inCell ? (pos.cellCharOffset ?? pos.charOffset) : pos.charOffset;
+  if (charOffset === 0) {
+    this.handleBackspace(pos, inCell);
+    return;
+  }
+  const text = getTextBeforeCursor(this.wasm, pos, inCell, charOffset);
+  const wordStart = findWordBoundaryInText(text);
+  if (wordStart < charOffset) {
+    this.cursor.setAnchor();
+    const target = inCell
+      ? { ...pos, cellCharOffset: wordStart, charOffset: wordStart }
+      : { ...pos, charOffset: wordStart };
+    this.cursor.moveTo(target);
+    this.deleteSelection();
+  }
+}
+
+function getTextBeforeCursor(wasm: WasmBridge, pos: any, inCell: boolean, offset: number): string {
+  if (inCell && pos.parentParaIndex != null && pos.controlIndex != null && pos.cellIndex != null && pos.cellParaIndex != null) {
+    try {
+      return wasm.getTextInCell(pos.sectionIndex, pos.parentParaIndex, pos.controlIndex, pos.cellIndex, pos.cellParaIndex, 0, offset);
+    } catch { /* fallback */ }
+  }
+  return wasm.getTextRange(pos.sectionIndex, pos.paragraphIndex, 0, offset);
+}
+
+function findWordBoundaryInText(text: string): number {
+  let i = text.length - 1;
+  while (i >= 0 && isWordSeparator(text[i])) i--;
+  while (i >= 0 && !isWordSeparator(text[i])) i--;
+  return i + 1;
+}
+
+function isWordSeparator(ch: string): boolean {
+  return /[\s　.,;:!?'"()[\]{}<>\/\\|@#$%^&*~`+=\-_]/.test(ch);
+}
+
 export function onCopy(this: any, e: ClipboardEvent): void {
   if (!this.active) return;