{"ast":null,"code":"/**\r\n * @author NHN Ent. FE Development Team <dl_javascript@nhn.com>\r\n * @fileoverview Invoker - invoke commands\r\n */\nimport snippet from 'tui-code-snippet';\nimport { Promise } from './util';\nimport commandFactory from './factory/command';\nimport { eventNames, rejectMessages } from './consts';\nconst {\n  isFunction,\n  isString,\n  CustomEvents\n} = snippet;\n/**\r\n * Invoker\r\n * @class\r\n * @ignore\r\n */\n\nclass Invoker {\n  constructor() {\n    /**\r\n     * Undo stack\r\n     * @type {Array.<Command>}\r\n     * @private\r\n     */\n    this._undoStack = [];\n    /**\r\n     * Redo stack\r\n     * @type {Array.<Command>}\r\n     * @private\r\n     */\n\n    this._redoStack = [];\n    /**\r\n     * Lock-flag for executing command\r\n     * @type {boolean}\r\n     * @private\r\n     */\n\n    this._isLocked = false;\n    this._isSilent = false;\n  }\n  /**\r\n   * Invoke command execution\r\n   * @param {Command} command - Command\r\n   * @returns {Promise}\r\n   * @private\r\n   */\n\n\n  _invokeExecution(command) {\n    this.lock();\n    let {\n      args\n    } = command;\n\n    if (!args) {\n      args = [];\n    }\n\n    return command.execute(...args).then(value => {\n      if (!this._isSilent) {\n        this.pushUndoStack(command);\n      }\n\n      this.unlock();\n\n      if (isFunction(command.executeCallback)) {\n        command.executeCallback(value);\n      }\n\n      return value;\n    })['catch'](message => {\n      this.unlock();\n      return Promise.reject(message);\n    });\n  }\n  /**\r\n   * Invoke command undo\r\n   * @param {Command} command - Command\r\n   * @returns {Promise}\r\n   * @private\r\n   */\n\n\n  _invokeUndo(command) {\n    this.lock();\n    let {\n      args\n    } = command;\n\n    if (!args) {\n      args = [];\n    }\n\n    return command.undo(...args).then(value => {\n      this.pushRedoStack(command);\n      this.unlock();\n\n      if (isFunction(command.undoCallback)) {\n        command.undoCallback(value);\n      }\n\n      return value;\n    })['catch'](message => {\n      this.unlock();\n      return Promise.reject(message);\n    });\n  }\n  /**\r\n   * fire REDO_STACK_CHANGED event\r\n   * @private\r\n   */\n\n\n  _fireRedoStackChanged() {\n    this.fire(eventNames.REDO_STACK_CHANGED, this._redoStack.length);\n  }\n  /**\r\n   * fire UNDO_STACK_CHANGED event\r\n   * @private\r\n   */\n\n\n  _fireUndoStackChanged() {\n    this.fire(eventNames.UNDO_STACK_CHANGED, this._undoStack.length);\n  }\n  /**\r\n   * Lock this invoker\r\n   */\n\n\n  lock() {\n    this._isLocked = true;\n  }\n  /**\r\n   * Unlock this invoker\r\n   */\n\n\n  unlock() {\n    this._isLocked = false;\n  }\n\n  executeSilent(...args) {\n    this._isSilent = true;\n    return this.execute(...args, this._isSilent).then(() => {\n      this._isSilent = false;\n    });\n  }\n  /**\r\n   * Invoke command\r\n   * Store the command to the undoStack\r\n   * Clear the redoStack\r\n   * @param {String} commandName - Command name\r\n   * @param {...*} args - Arguments for creating command\r\n   * @returns {Promise}\r\n   */\n\n\n  execute(...args) {\n    if (this._isLocked) {\n      return Promise.reject(rejectMessages.isLock);\n    }\n\n    let [command] = args;\n\n    if (isString(command)) {\n      command = commandFactory.create(...args);\n    }\n\n    return this._invokeExecution(command).then(value => {\n      this.clearRedoStack();\n      return value;\n    });\n  }\n  /**\r\n   * Undo command\r\n   * @returns {Promise}\r\n   */\n\n\n  undo() {\n    let command = this._undoStack.pop();\n\n    let promise;\n    let message = '';\n\n    if (command && this._isLocked) {\n      this.pushUndoStack(command, true);\n      command = null;\n    }\n\n    if (command) {\n      if (this.isEmptyUndoStack()) {\n        this._fireUndoStackChanged();\n      }\n\n      promise = this._invokeUndo(command);\n    } else {\n      message = rejectMessages.undo;\n\n      if (this._isLocked) {\n        message = `${message} Because ${rejectMessages.isLock}`;\n      }\n\n      promise = Promise.reject(message);\n    }\n\n    return promise;\n  }\n  /**\r\n   * Redo command\r\n   * @returns {Promise}\r\n   */\n\n\n  redo() {\n    let command = this._redoStack.pop();\n\n    let promise;\n    let message = '';\n\n    if (command && this._isLocked) {\n      this.pushRedoStack(command, true);\n      command = null;\n    }\n\n    if (command) {\n      if (this.isEmptyRedoStack()) {\n        this._fireRedoStackChanged();\n      }\n\n      promise = this._invokeExecution(command);\n    } else {\n      message = rejectMessages.redo;\n\n      if (this._isLocked) {\n        message = `${message} Because ${rejectMessages.isLock}`;\n      }\n\n      promise = Promise.reject(message);\n    }\n\n    return promise;\n  }\n  /**\r\n   * Push undo stack\r\n   * @param {Command} command - command\r\n   * @param {boolean} [isSilent] - Fire event or not\r\n   */\n\n\n  pushUndoStack(command, isSilent) {\n    this._undoStack.push(command);\n\n    if (!isSilent) {\n      this._fireUndoStackChanged();\n    }\n  }\n  /**\r\n   * Push redo stack\r\n   * @param {Command} command - command\r\n   * @param {boolean} [isSilent] - Fire event or not\r\n   */\n\n\n  pushRedoStack(command, isSilent) {\n    this._redoStack.push(command);\n\n    if (!isSilent) {\n      this._fireRedoStackChanged();\n    }\n  }\n  /**\r\n   * Return whether the redoStack is empty\r\n   * @returns {boolean}\r\n   */\n\n\n  isEmptyRedoStack() {\n    return this._redoStack.length === 0;\n  }\n  /**\r\n   * Return whether the undoStack is empty\r\n   * @returns {boolean}\r\n   */\n\n\n  isEmptyUndoStack() {\n    return this._undoStack.length === 0;\n  }\n  /**\r\n   * Clear undoStack\r\n   */\n\n\n  clearUndoStack() {\n    if (!this.isEmptyUndoStack()) {\n      this._undoStack = [];\n\n      this._fireUndoStackChanged();\n    }\n  }\n  /**\r\n   * Clear redoStack\r\n   */\n\n\n  clearRedoStack() {\n    if (!this.isEmptyRedoStack()) {\n      this._redoStack = [];\n\n      this._fireRedoStackChanged();\n    }\n  }\n\n}\n\nCustomEvents.mixin(Invoker);\nexport default Invoker;","map":{"version":3,"sources":["C:/Users/kkwan_000/Desktop/git/2017110269/minsung/src/js/invoker.js"],"names":["snippet","Promise","commandFactory","eventNames","rejectMessages","isFunction","isString","CustomEvents","Invoker","constructor","_undoStack","_redoStack","_isLocked","_isSilent","_invokeExecution","command","lock","args","execute","then","value","pushUndoStack","unlock","executeCallback","message","reject","_invokeUndo","undo","pushRedoStack","undoCallback","_fireRedoStackChanged","fire","REDO_STACK_CHANGED","length","_fireUndoStackChanged","UNDO_STACK_CHANGED","executeSilent","isLock","create","clearRedoStack","pop","promise","isEmptyUndoStack","redo","isEmptyRedoStack","isSilent","push","clearUndoStack","mixin"],"mappings":"AAAA;AACA;AACA;AACA;AACA,OAAOA,OAAP,MAAoB,kBAApB;AACA,SAASC,OAAT,QAAwB,QAAxB;AACA,OAAOC,cAAP,MAA2B,mBAA3B;AACA,SAASC,UAAT,EAAqBC,cAArB,QAA2C,UAA3C;AAEA,MAAM;AAAEC,EAAAA,UAAF;AAAcC,EAAAA,QAAd;AAAwBC,EAAAA;AAAxB,IAAyCP,OAA/C;AAEA;AACA;AACA;AACA;AACA;;AACA,MAAMQ,OAAN,CAAc;AACZC,EAAAA,WAAW,GAAG;AACZ;AACJ;AACA;AACA;AACA;AACI,SAAKC,UAAL,GAAkB,EAAlB;AAEA;AACJ;AACA;AACA;AACA;;AACI,SAAKC,UAAL,GAAkB,EAAlB;AAEA;AACJ;AACA;AACA;AACA;;AACI,SAAKC,SAAL,GAAiB,KAAjB;AAEA,SAAKC,SAAL,GAAiB,KAAjB;AACD;AAED;AACF;AACA;AACA;AACA;AACA;;;AACEC,EAAAA,gBAAgB,CAACC,OAAD,EAAU;AACxB,SAAKC,IAAL;AAEA,QAAI;AAAEC,MAAAA;AAAF,QAAWF,OAAf;;AACA,QAAI,CAACE,IAAL,EAAW;AACTA,MAAAA,IAAI,GAAG,EAAP;AACD;;AAED,WAAOF,OAAO,CACXG,OADI,CACI,GAAGD,IADP,EAEJE,IAFI,CAEEC,KAAD,IAAW;AACf,UAAI,CAAC,KAAKP,SAAV,EAAqB;AACnB,aAAKQ,aAAL,CAAmBN,OAAnB;AACD;;AACD,WAAKO,MAAL;;AACA,UAAIjB,UAAU,CAACU,OAAO,CAACQ,eAAT,CAAd,EAAyC;AACvCR,QAAAA,OAAO,CAACQ,eAAR,CAAwBH,KAAxB;AACD;;AAED,aAAOA,KAAP;AACD,KAZI,EAaJ,OAbI,EAaMI,OAAD,IAAa;AACrB,WAAKF,MAAL;AAEA,aAAOrB,OAAO,CAACwB,MAAR,CAAeD,OAAf,CAAP;AACD,KAjBI,CAAP;AAkBD;AAED;AACF;AACA;AACA;AACA;AACA;;;AACEE,EAAAA,WAAW,CAACX,OAAD,EAAU;AACnB,SAAKC,IAAL;AAEA,QAAI;AAAEC,MAAAA;AAAF,QAAWF,OAAf;;AACA,QAAI,CAACE,IAAL,EAAW;AACTA,MAAAA,IAAI,GAAG,EAAP;AACD;;AAED,WAAOF,OAAO,CACXY,IADI,CACC,GAAGV,IADJ,EAEJE,IAFI,CAEEC,KAAD,IAAW;AACf,WAAKQ,aAAL,CAAmBb,OAAnB;AACA,WAAKO,MAAL;;AACA,UAAIjB,UAAU,CAACU,OAAO,CAACc,YAAT,CAAd,EAAsC;AACpCd,QAAAA,OAAO,CAACc,YAAR,CAAqBT,KAArB;AACD;;AAED,aAAOA,KAAP;AACD,KAVI,EAWJ,OAXI,EAWMI,OAAD,IAAa;AACrB,WAAKF,MAAL;AAEA,aAAOrB,OAAO,CAACwB,MAAR,CAAeD,OAAf,CAAP;AACD,KAfI,CAAP;AAgBD;AAED;AACF;AACA;AACA;;;AACEM,EAAAA,qBAAqB,GAAG;AACtB,SAAKC,IAAL,CAAU5B,UAAU,CAAC6B,kBAArB,EAAyC,KAAKrB,UAAL,CAAgBsB,MAAzD;AACD;AAED;AACF;AACA;AACA;;;AACEC,EAAAA,qBAAqB,GAAG;AACtB,SAAKH,IAAL,CAAU5B,UAAU,CAACgC,kBAArB,EAAyC,KAAKzB,UAAL,CAAgBuB,MAAzD;AACD;AAED;AACF;AACA;;;AACEjB,EAAAA,IAAI,GAAG;AACL,SAAKJ,SAAL,GAAiB,IAAjB;AACD;AAED;AACF;AACA;;;AACEU,EAAAA,MAAM,GAAG;AACP,SAAKV,SAAL,GAAiB,KAAjB;AACD;;AAEDwB,EAAAA,aAAa,CAAC,GAAGnB,IAAJ,EAAU;AACrB,SAAKJ,SAAL,GAAiB,IAAjB;AAEA,WAAO,KAAKK,OAAL,CAAa,GAAGD,IAAhB,EAAsB,KAAKJ,SAA3B,EAAsCM,IAAtC,CAA2C,MAAM;AACtD,WAAKN,SAAL,GAAiB,KAAjB;AACD,KAFM,CAAP;AAGD;AAED;AACF;AACA;AACA;AACA;AACA;AACA;AACA;;;AACEK,EAAAA,OAAO,CAAC,GAAGD,IAAJ,EAAU;AACf,QAAI,KAAKL,SAAT,EAAoB;AAClB,aAAOX,OAAO,CAACwB,MAAR,CAAerB,cAAc,CAACiC,MAA9B,CAAP;AACD;;AAED,QAAI,CAACtB,OAAD,IAAYE,IAAhB;;AACA,QAAIX,QAAQ,CAACS,OAAD,CAAZ,EAAuB;AACrBA,MAAAA,OAAO,GAAGb,cAAc,CAACoC,MAAf,CAAsB,GAAGrB,IAAzB,CAAV;AACD;;AAED,WAAO,KAAKH,gBAAL,CAAsBC,OAAtB,EAA+BI,IAA/B,CAAqCC,KAAD,IAAW;AACpD,WAAKmB,cAAL;AAEA,aAAOnB,KAAP;AACD,KAJM,CAAP;AAKD;AAED;AACF;AACA;AACA;;;AACEO,EAAAA,IAAI,GAAG;AACL,QAAIZ,OAAO,GAAG,KAAKL,UAAL,CAAgB8B,GAAhB,EAAd;;AACA,QAAIC,OAAJ;AACA,QAAIjB,OAAO,GAAG,EAAd;;AAEA,QAAIT,OAAO,IAAI,KAAKH,SAApB,EAA+B;AAC7B,WAAKS,aAAL,CAAmBN,OAAnB,EAA4B,IAA5B;AACAA,MAAAA,OAAO,GAAG,IAAV;AACD;;AACD,QAAIA,OAAJ,EAAa;AACX,UAAI,KAAK2B,gBAAL,EAAJ,EAA6B;AAC3B,aAAKR,qBAAL;AACD;;AACDO,MAAAA,OAAO,GAAG,KAAKf,WAAL,CAAiBX,OAAjB,CAAV;AACD,KALD,MAKO;AACLS,MAAAA,OAAO,GAAGpB,cAAc,CAACuB,IAAzB;;AACA,UAAI,KAAKf,SAAT,EAAoB;AAClBY,QAAAA,OAAO,GAAI,GAAEA,OAAQ,YAAWpB,cAAc,CAACiC,MAAO,EAAtD;AACD;;AACDI,MAAAA,OAAO,GAAGxC,OAAO,CAACwB,MAAR,CAAeD,OAAf,CAAV;AACD;;AAED,WAAOiB,OAAP;AACD;AAED;AACF;AACA;AACA;;;AACEE,EAAAA,IAAI,GAAG;AACL,QAAI5B,OAAO,GAAG,KAAKJ,UAAL,CAAgB6B,GAAhB,EAAd;;AACA,QAAIC,OAAJ;AACA,QAAIjB,OAAO,GAAG,EAAd;;AAEA,QAAIT,OAAO,IAAI,KAAKH,SAApB,EAA+B;AAC7B,WAAKgB,aAAL,CAAmBb,OAAnB,EAA4B,IAA5B;AACAA,MAAAA,OAAO,GAAG,IAAV;AACD;;AACD,QAAIA,OAAJ,EAAa;AACX,UAAI,KAAK6B,gBAAL,EAAJ,EAA6B;AAC3B,aAAKd,qBAAL;AACD;;AACDW,MAAAA,OAAO,GAAG,KAAK3B,gBAAL,CAAsBC,OAAtB,CAAV;AACD,KALD,MAKO;AACLS,MAAAA,OAAO,GAAGpB,cAAc,CAACuC,IAAzB;;AACA,UAAI,KAAK/B,SAAT,EAAoB;AAClBY,QAAAA,OAAO,GAAI,GAAEA,OAAQ,YAAWpB,cAAc,CAACiC,MAAO,EAAtD;AACD;;AACDI,MAAAA,OAAO,GAAGxC,OAAO,CAACwB,MAAR,CAAeD,OAAf,CAAV;AACD;;AAED,WAAOiB,OAAP;AACD;AAED;AACF;AACA;AACA;AACA;;;AACEpB,EAAAA,aAAa,CAACN,OAAD,EAAU8B,QAAV,EAAoB;AAC/B,SAAKnC,UAAL,CAAgBoC,IAAhB,CAAqB/B,OAArB;;AACA,QAAI,CAAC8B,QAAL,EAAe;AACb,WAAKX,qBAAL;AACD;AACF;AAED;AACF;AACA;AACA;AACA;;;AACEN,EAAAA,aAAa,CAACb,OAAD,EAAU8B,QAAV,EAAoB;AAC/B,SAAKlC,UAAL,CAAgBmC,IAAhB,CAAqB/B,OAArB;;AACA,QAAI,CAAC8B,QAAL,EAAe;AACb,WAAKf,qBAAL;AACD;AACF;AAED;AACF;AACA;AACA;;;AACEc,EAAAA,gBAAgB,GAAG;AACjB,WAAO,KAAKjC,UAAL,CAAgBsB,MAAhB,KAA2B,CAAlC;AACD;AAED;AACF;AACA;AACA;;;AACES,EAAAA,gBAAgB,GAAG;AACjB,WAAO,KAAKhC,UAAL,CAAgBuB,MAAhB,KAA2B,CAAlC;AACD;AAED;AACF;AACA;;;AACEc,EAAAA,cAAc,GAAG;AACf,QAAI,CAAC,KAAKL,gBAAL,EAAL,EAA8B;AAC5B,WAAKhC,UAAL,GAAkB,EAAlB;;AACA,WAAKwB,qBAAL;AACD;AACF;AAED;AACF;AACA;;;AACEK,EAAAA,cAAc,GAAG;AACf,QAAI,CAAC,KAAKK,gBAAL,EAAL,EAA8B;AAC5B,WAAKjC,UAAL,GAAkB,EAAlB;;AACA,WAAKmB,qBAAL;AACD;AACF;;AA/QW;;AAkRdvB,YAAY,CAACyC,KAAb,CAAmBxC,OAAnB;AAEA,eAAeA,OAAf","sourcesContent":["/**\r\n * @author NHN Ent. FE Development Team <dl_javascript@nhn.com>\r\n * @fileoverview Invoker - invoke commands\r\n */\r\nimport snippet from 'tui-code-snippet';\r\nimport { Promise } from './util';\r\nimport commandFactory from './factory/command';\r\nimport { eventNames, rejectMessages } from './consts';\r\n\r\nconst { isFunction, isString, CustomEvents } = snippet;\r\n\r\n/**\r\n * Invoker\r\n * @class\r\n * @ignore\r\n */\r\nclass Invoker {\r\n  constructor() {\r\n    /**\r\n     * Undo stack\r\n     * @type {Array.<Command>}\r\n     * @private\r\n     */\r\n    this._undoStack = [];\r\n\r\n    /**\r\n     * Redo stack\r\n     * @type {Array.<Command>}\r\n     * @private\r\n     */\r\n    this._redoStack = [];\r\n\r\n    /**\r\n     * Lock-flag for executing command\r\n     * @type {boolean}\r\n     * @private\r\n     */\r\n    this._isLocked = false;\r\n\r\n    this._isSilent = false;\r\n  }\r\n\r\n  /**\r\n   * Invoke command execution\r\n   * @param {Command} command - Command\r\n   * @returns {Promise}\r\n   * @private\r\n   */\r\n  _invokeExecution(command) {\r\n    this.lock();\r\n\r\n    let { args } = command;\r\n    if (!args) {\r\n      args = [];\r\n    }\r\n\r\n    return command\r\n      .execute(...args)\r\n      .then((value) => {\r\n        if (!this._isSilent) {\r\n          this.pushUndoStack(command);\r\n        }\r\n        this.unlock();\r\n        if (isFunction(command.executeCallback)) {\r\n          command.executeCallback(value);\r\n        }\r\n\r\n        return value;\r\n      })\r\n      ['catch']((message) => {\r\n        this.unlock();\r\n\r\n        return Promise.reject(message);\r\n      });\r\n  }\r\n\r\n  /**\r\n   * Invoke command undo\r\n   * @param {Command} command - Command\r\n   * @returns {Promise}\r\n   * @private\r\n   */\r\n  _invokeUndo(command) {\r\n    this.lock();\r\n\r\n    let { args } = command;\r\n    if (!args) {\r\n      args = [];\r\n    }\r\n\r\n    return command\r\n      .undo(...args)\r\n      .then((value) => {\r\n        this.pushRedoStack(command);\r\n        this.unlock();\r\n        if (isFunction(command.undoCallback)) {\r\n          command.undoCallback(value);\r\n        }\r\n\r\n        return value;\r\n      })\r\n      ['catch']((message) => {\r\n        this.unlock();\r\n\r\n        return Promise.reject(message);\r\n      });\r\n  }\r\n\r\n  /**\r\n   * fire REDO_STACK_CHANGED event\r\n   * @private\r\n   */\r\n  _fireRedoStackChanged() {\r\n    this.fire(eventNames.REDO_STACK_CHANGED, this._redoStack.length);\r\n  }\r\n\r\n  /**\r\n   * fire UNDO_STACK_CHANGED event\r\n   * @private\r\n   */\r\n  _fireUndoStackChanged() {\r\n    this.fire(eventNames.UNDO_STACK_CHANGED, this._undoStack.length);\r\n  }\r\n\r\n  /**\r\n   * Lock this invoker\r\n   */\r\n  lock() {\r\n    this._isLocked = true;\r\n  }\r\n\r\n  /**\r\n   * Unlock this invoker\r\n   */\r\n  unlock() {\r\n    this._isLocked = false;\r\n  }\r\n\r\n  executeSilent(...args) {\r\n    this._isSilent = true;\r\n\r\n    return this.execute(...args, this._isSilent).then(() => {\r\n      this._isSilent = false;\r\n    });\r\n  }\r\n\r\n  /**\r\n   * Invoke command\r\n   * Store the command to the undoStack\r\n   * Clear the redoStack\r\n   * @param {String} commandName - Command name\r\n   * @param {...*} args - Arguments for creating command\r\n   * @returns {Promise}\r\n   */\r\n  execute(...args) {\r\n    if (this._isLocked) {\r\n      return Promise.reject(rejectMessages.isLock);\r\n    }\r\n\r\n    let [command] = args;\r\n    if (isString(command)) {\r\n      command = commandFactory.create(...args);\r\n    }\r\n\r\n    return this._invokeExecution(command).then((value) => {\r\n      this.clearRedoStack();\r\n\r\n      return value;\r\n    });\r\n  }\r\n\r\n  /**\r\n   * Undo command\r\n   * @returns {Promise}\r\n   */\r\n  undo() {\r\n    let command = this._undoStack.pop();\r\n    let promise;\r\n    let message = '';\r\n\r\n    if (command && this._isLocked) {\r\n      this.pushUndoStack(command, true);\r\n      command = null;\r\n    }\r\n    if (command) {\r\n      if (this.isEmptyUndoStack()) {\r\n        this._fireUndoStackChanged();\r\n      }\r\n      promise = this._invokeUndo(command);\r\n    } else {\r\n      message = rejectMessages.undo;\r\n      if (this._isLocked) {\r\n        message = `${message} Because ${rejectMessages.isLock}`;\r\n      }\r\n      promise = Promise.reject(message);\r\n    }\r\n\r\n    return promise;\r\n  }\r\n\r\n  /**\r\n   * Redo command\r\n   * @returns {Promise}\r\n   */\r\n  redo() {\r\n    let command = this._redoStack.pop();\r\n    let promise;\r\n    let message = '';\r\n\r\n    if (command && this._isLocked) {\r\n      this.pushRedoStack(command, true);\r\n      command = null;\r\n    }\r\n    if (command) {\r\n      if (this.isEmptyRedoStack()) {\r\n        this._fireRedoStackChanged();\r\n      }\r\n      promise = this._invokeExecution(command);\r\n    } else {\r\n      message = rejectMessages.redo;\r\n      if (this._isLocked) {\r\n        message = `${message} Because ${rejectMessages.isLock}`;\r\n      }\r\n      promise = Promise.reject(message);\r\n    }\r\n\r\n    return promise;\r\n  }\r\n\r\n  /**\r\n   * Push undo stack\r\n   * @param {Command} command - command\r\n   * @param {boolean} [isSilent] - Fire event or not\r\n   */\r\n  pushUndoStack(command, isSilent) {\r\n    this._undoStack.push(command);\r\n    if (!isSilent) {\r\n      this._fireUndoStackChanged();\r\n    }\r\n  }\r\n\r\n  /**\r\n   * Push redo stack\r\n   * @param {Command} command - command\r\n   * @param {boolean} [isSilent] - Fire event or not\r\n   */\r\n  pushRedoStack(command, isSilent) {\r\n    this._redoStack.push(command);\r\n    if (!isSilent) {\r\n      this._fireRedoStackChanged();\r\n    }\r\n  }\r\n\r\n  /**\r\n   * Return whether the redoStack is empty\r\n   * @returns {boolean}\r\n   */\r\n  isEmptyRedoStack() {\r\n    return this._redoStack.length === 0;\r\n  }\r\n\r\n  /**\r\n   * Return whether the undoStack is empty\r\n   * @returns {boolean}\r\n   */\r\n  isEmptyUndoStack() {\r\n    return this._undoStack.length === 0;\r\n  }\r\n\r\n  /**\r\n   * Clear undoStack\r\n   */\r\n  clearUndoStack() {\r\n    if (!this.isEmptyUndoStack()) {\r\n      this._undoStack = [];\r\n      this._fireUndoStackChanged();\r\n    }\r\n  }\r\n\r\n  /**\r\n   * Clear redoStack\r\n   */\r\n  clearRedoStack() {\r\n    if (!this.isEmptyRedoStack()) {\r\n      this._redoStack = [];\r\n      this._fireRedoStackChanged();\r\n    }\r\n  }\r\n}\r\n\r\nCustomEvents.mixin(Invoker);\r\n\r\nexport default Invoker;\r\n"]},"metadata":{},"sourceType":"module"}