text: // Copyright Joyent, Inc. and other Node contributors.
  //
  // Permission is hereby granted, free of charge, to any person obtaining a
  // copy of this software and associated documentation files (the
  // "Software"), to deal in the Software without restriction, including
  // without limitation the rights to use, copy, modify, merge, publish,
  // distribute, sublicense, and/or sell copies of the Software, and to permit
  // persons to whom the Software is furnished to do so, subject to the
  // following conditions:
  //
  // The above copyright notice and this permission notice shall be included
  // in all copies or substantial portions of the Software.
  //
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
  // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
  // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  // USE OR OTHER DEALINGS IN THE SOFTWARE.
  
  // Flags: --expose_internals
  'use strict';
  const common = require('../common');
  const assert = require('assert');
  
  const fs = require('../../../../');
  
  const O_APPEND = fs.constants.O_APPEND || 0;
  const O_CREAT = fs.constants.O_CREAT || 0;
  const O_EXCL = fs.constants.O_EXCL || 0;
  const O_RDONLY = fs.constants.O_RDONLY || 0;
  const O_RDWR = fs.constants.O_RDWR || 0;
  const O_SYNC = fs.constants.O_SYNC || 0;
  const O_TRUNC = fs.constants.O_TRUNC || 0;
  const O_WRONLY = fs.constants.O_WRONLY || 0;
  
  const {stringToFlags} = require('internal/fs');
  
  assert.strictEqual(stringToFlags('r'), O_RDONLY);
  assert.strictEqual(stringToFlags('r+'), O_RDWR);
  assert.strictEqual(stringToFlags('rs+'), O_RDWR | O_SYNC);
  assert.strictEqual(stringToFlags('sr+'), O_RDWR | O_SYNC);
  assert.strictEqual(stringToFlags('w'), O_TRUNC | O_CREAT | O_WRONLY);
  assert.strictEqual(stringToFlags('w+'), O_TRUNC | O_CREAT | O_RDWR);
  assert.strictEqual(stringToFlags('a'), O_APPEND | O_CREAT | O_WRONLY);
  assert.strictEqual(stringToFlags('a+'), O_APPEND | O_CREAT | O_RDWR);
  
  assert.strictEqual(stringToFlags('wx'), O_TRUNC | O_CREAT | O_WRONLY | O_EXCL);
  assert.strictEqual(stringToFlags('xw'), O_TRUNC | O_CREAT | O_WRONLY | O_EXCL);
  assert.strictEqual(stringToFlags('wx+'), O_TRUNC | O_CREAT | O_RDWR | O_EXCL);
  assert.strictEqual(stringToFlags('xw+'), O_TRUNC | O_CREAT | O_RDWR | O_EXCL);
  assert.strictEqual(stringToFlags('ax'), O_APPEND | O_CREAT | O_WRONLY | O_EXCL);
  assert.strictEqual(stringToFlags('xa'), O_APPEND | O_CREAT | O_WRONLY | O_EXCL);
  assert.strictEqual(stringToFlags('ax+'), O_APPEND | O_CREAT | O_RDWR | O_EXCL);
  assert.strictEqual(stringToFlags('xa+'), O_APPEND | O_CREAT | O_RDWR | O_EXCL);
  
  ('+ +a +r +w rw wa war raw r++ a++ w++ x +x x+ rx rx+ wxx wax xwx xxx')
    .split(' ')
    .forEach(function(flags) {
      common.expectsError(
        () => stringToFlags(flags),
        {code: 'ERR_INVALID_OPT_VALUE', type: TypeError}
      );
    });
  
  common.expectsError(
    () => stringToFlags({}),
    {code: 'ERR_INVALID_OPT_VALUE', type: TypeError}
  );
  
  common.expectsError(
    () => stringToFlags(true),
    {code: 'ERR_INVALID_OPT_VALUE', type: TypeError}
  );
  
  common.expectsError(
    () => stringToFlags(null),
    {code: 'ERR_INVALID_OPT_VALUE', type: TypeError}
  );
  