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'use strict';

var isGlob = require('is-glob');
var pathPosixDirname = require('path').posix.dirname;
var isWin32 = require('os').platform() === 'win32';

var slash = '/';
var backslash = /\\/g;
var enclosure = /[\{\[].*[\}\]]$/;
var globby = /(^|[^\\])([\{\[]|$[^$]+$)/;
var escaped = /\$[\!\*\?\|\[\]\($\{\}])/g;

/**
 * @param {string} str
 * @param {Object} opts
 * @param {boolean} [opts.flipBackslashes=true]
 * @returns {string}
 */
module.exports = function globParent(str, opts) {
  var options = Object.assign({ flipBackslashes: true }, opts);

// flip windows path separators
  if (options.flipBackslashes && isWin32 && str.indexOf(slash) < 0) {
    str = str.replace(backslash, slash);
  }

// special case for strings ending in enclosure containing path separator
  if (enclosure.test(str)) {
    str += slash;
  }

// preserves full path in case of trailing path separator
  str += 'a';

// remove path parts that are globby
  do {
    str = pathPosixDirname(str);
  } while (isGlob(str) || globby.test(str));

// remove escape chars and return result
  return str.replace(escaped, '$1');
};

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