browserfs
Version:
A filesystem in your browser!
68 lines • 12.6 kB
JavaScript
;
var api_error = require('./api_error');
(function (ActionType) {
ActionType[ActionType["NOP"] = 0] = "NOP";
ActionType[ActionType["THROW_EXCEPTION"] = 1] = "THROW_EXCEPTION";
ActionType[ActionType["TRUNCATE_FILE"] = 2] = "TRUNCATE_FILE";
ActionType[ActionType["CREATE_FILE"] = 3] = "CREATE_FILE";
})(exports.ActionType || (exports.ActionType = {}));
var ActionType = exports.ActionType;
var FileFlag = (function () {
function FileFlag(flagStr) {
this.flagStr = flagStr;
if (FileFlag.validFlagStrs.indexOf(flagStr) < 0) {
throw new api_error.ApiError(api_error.ErrorCode.EINVAL, "Invalid flag: " + flagStr);
}
}
FileFlag.getFileFlag = function (flagStr) {
if (FileFlag.flagCache.hasOwnProperty(flagStr)) {
return FileFlag.flagCache[flagStr];
}
return FileFlag.flagCache[flagStr] = new FileFlag(flagStr);
};
FileFlag.prototype.getFlagString = function () {
return this.flagStr;
};
FileFlag.prototype.isReadable = function () {
return this.flagStr.indexOf('r') !== -1 || this.flagStr.indexOf('+') !== -1;
};
FileFlag.prototype.isWriteable = function () {
return this.flagStr.indexOf('w') !== -1 || this.flagStr.indexOf('a') !== -1 || this.flagStr.indexOf('+') !== -1;
};
FileFlag.prototype.isTruncating = function () {
return this.flagStr.indexOf('w') !== -1;
};
FileFlag.prototype.isAppendable = function () {
return this.flagStr.indexOf('a') !== -1;
};
FileFlag.prototype.isSynchronous = function () {
return this.flagStr.indexOf('s') !== -1;
};
FileFlag.prototype.isExclusive = function () {
return this.flagStr.indexOf('x') !== -1;
};
FileFlag.prototype.pathExistsAction = function () {
if (this.isExclusive()) {
return ActionType.THROW_EXCEPTION;
}
else if (this.isTruncating()) {
return ActionType.TRUNCATE_FILE;
}
else {
return ActionType.NOP;
}
};
FileFlag.prototype.pathNotExistsAction = function () {
if ((this.isWriteable() || this.isAppendable()) && this.flagStr !== 'r+') {
return ActionType.CREATE_FILE;
}
else {
return ActionType.THROW_EXCEPTION;
}
};
FileFlag.flagCache = {};
FileFlag.validFlagStrs = ['r', 'r+', 'rs', 'rs+', 'w', 'wx', 'w+', 'wx+', 'a', 'ax', 'a+', 'ax+'];
return FileFlag;
}());
exports.FileFlag = FileFlag;
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A convenience object.\n *\n * * `'r'` - Open file for reading. An exception occurs if the file does not exist.\n * * `'r+'` - Open file for reading and writing. An exception occurs if the file does not exist.\n * * `'rs'` - Open file for reading in synchronous mode. Instructs the filesystem to not cache writes.\n * * `'rs+'` - Open file for reading and writing, and opens the file in synchronous mode.\n * * `'w'` - Open file for writing. The file is created (if it does not exist) or truncated (if it exists).\n * * `'wx'` - Like 'w' but opens the file in exclusive mode.\n * * `'w+'` - Open file for reading and writing. The file is created (if it does not exist) or truncated (if it exists).\n * * `'wx+'` - Like 'w+' but opens the file in exclusive mode.\n * * `'a'` - Open file for appending. The file is created if it does not exist.\n * * `'ax'` - Like 'a' but opens the file in exclusive mode.\n * * `'a+'` - Open file for reading and appending. The file is created if it does not exist.\n * * `'ax+'` - Like 'a+' but opens the file in exclusive mode.\n *\n * Exclusive mode ensures that the file path is newly created.\n * @class\n */\nexport class FileFlag {\n  // Contains cached FileMode instances.\n  private static flagCache: { [mode: string]: FileFlag } = {};\n  // Array of valid mode strings.\n  private static validFlagStrs = ['r', 'r+', 'rs', 'rs+', 'w', 'wx', 'w+', 'wx+', 'a', 'ax', 'a+', 'ax+'];\n\n  /**\n   * Get an object representing the given file mode.\n   * @param [String] modeStr The string representing the mode\n   * @return [BrowserFS.FileMode] The FileMode object representing the mode\n   * @throw [BrowserFS.ApiError] when the mode string is invalid\n   */\n  public static getFileFlag(flagStr: string): FileFlag {\n    // Check cache first.\n    if (FileFlag.flagCache.hasOwnProperty(flagStr)) {\n      return FileFlag.flagCache[flagStr];\n    }\n    return FileFlag.flagCache[flagStr] = new FileFlag(flagStr);\n  }\n\n  private flagStr: string;\n  /**\n   * This should never be called directly.\n   * @param [String] modeStr The string representing the mode\n   * @throw [BrowserFS.ApiError] when the mode string is invalid\n   */\n  constructor(flagStr: string) {\n    this.flagStr = flagStr;\n    if (FileFlag.validFlagStrs.indexOf(flagStr) < 0) {\n      throw new api_error.ApiError(api_error.ErrorCode.EINVAL, \"Invalid flag: \" + flagStr);\n    }\n  }\n\n  /**\n   * Get the underlying flag string for this flag.\n   */\n  public getFlagString(): string {\n    return this.flagStr;\n  }\n\n  /**\n   * Returns true if the file is readable.\n   * @return [Boolean]\n   */\n  public isReadable(): boolean {\n    return this.flagStr.indexOf('r') !== -1 || this.flagStr.indexOf('+') !== -1;\n  }\n  /**\n   * Returns true if the file is writeable.\n   * @return [Boolean]\n   */\n  public isWriteable(): boolean {\n    return this.flagStr.indexOf('w') !== -1 || this.flagStr.indexOf('a') !== -1 || this.flagStr.indexOf('+') !== -1;\n  }\n  /**\n   * Returns true if the file mode should truncate.\n   * @return [Boolean]\n   */\n  public isTruncating(): boolean {\n    return this.flagStr.indexOf('w') !== -1;\n  }\n  /**\n   * Returns true if the file is appendable.\n   * @return [Boolean]\n   */\n  public isAppendable(): boolean {\n    return this.flagStr.indexOf('a') !== -1;\n  }\n  /**\n   * Returns true if the file is open in synchronous mode.\n   * @return [Boolean]\n   */\n  public isSynchronous(): boolean {\n    return this.flagStr.indexOf('s') !== -1;\n  }\n  /**\n   * Returns true if the file is open in exclusive mode.\n   * @return [Boolean]\n   */\n  public isExclusive(): boolean {\n    return this.flagStr.indexOf('x') !== -1;\n  }\n  /**\n   * Returns one of the static fields on this object that indicates the\n   * appropriate response to the path existing.\n   * @return [Number]\n   */\n  public pathExistsAction(): ActionType {\n    if (this.isExclusive()) {\n      return ActionType.THROW_EXCEPTION;\n    } else if (this.isTruncating()) {\n      return ActionType.TRUNCATE_FILE;\n    } else {\n      return ActionType.NOP;\n    }\n  }\n  /**\n   * Returns one of the static fields on this object that indicates the\n   * appropriate response to the path not existing.\n   * @return [Number]\n   */\n  public pathNotExistsAction(): ActionType {\n    if ((this.isWriteable() || this.isAppendable()) && this.flagStr !== 'r+') {\n      return ActionType.CREATE_FILE;\n    } else {\n      return ActionType.THROW_EXCEPTION;\n    }\n  }\n}\n"]}