text: 'use strict';
  
  var _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();
  
  function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
  
  module.exports = function () {
    return new IgnoreBase();
  };
  
  // A simple implementation of make-array
  function make_array(subject) {
    return Array.isArray(subject) ? subject : [subject];
  }
  
  var REGEX_BLANK_LINE = /^\s+$/;
  var REGEX_LEADING_EXCAPED_EXCLAMATION = /^\\\!/;
  var REGEX_LEADING_EXCAPED_HASH = /^\\#/;
  var SLASH = '/';
  var KEY_IGNORE = typeof Symbol !== 'undefined' ? Symbol.for('node-ignore')
  /* istanbul ignore next */
  : 'node-ignore';
  
  var IgnoreBase = function () {
    function IgnoreBase() {
      _classCallCheck(this, IgnoreBase);
  
      this._rules = [];
      this[KEY_IGNORE] = true;
      this._initCache();
    }
  
    _createClass(IgnoreBase, [{
      key: '_initCache',
      value: function _initCache() {
        this._cache = {};
      }
  
      // @param {Array.<string>|string|Ignore} pattern
  
    }, {
      key: 'add',
      value: function add(pattern) {
        this._added = false;
  
        if (typeof pattern === 'string') {
          pattern = pattern.split(/\r?\n/g);
        }
  
        make_array(pattern).forEach(this._addPattern, this);
  
        // Some rules have just added to the ignore,
        // making the behavior changed.
        if (this._added) {
          this._initCache();
        }
  
        return this;
      }
  
      // legacy
  
    }, {
      key: 'addPattern',
      value: function addPattern(pattern) {
        return this.add(pattern);
      }
    }, {
      key: '_addPattern',
      value: function _addPattern(pattern) {
        // #32
        if (pattern && pattern[KEY_IGNORE]) {
          this._rules = this._rules.concat(pattern._rules);
          this._added = true;
          return;
        }
  
        if (this._checkPattern(pattern)) {
          var rule = this._createRule(pattern);
          this._added = true;
          this._rules.push(rule);
        }
      }
    }, {
      key: '_checkPattern',
      value: function _checkPattern(pattern) {
        // > A blank line matches no files, so it can serve as a separator for readability.
        return pattern && typeof pattern === 'string' && !REGEX_BLANK_LINE.test(pattern)
  
        // > A line starting with # serves as a comment.
        && pattern.indexOf('#') !== 0;
      }
    }, {
      key: 'filter',
      value: function filter(paths) {
        var _this = this;
  
        return make_array(paths).filter(function (path) {
          return _this._filter(path);
        });
      }
    }, {
      key: 'createFilter',
      value: function createFilter() {
        var _this2 = this;
  
        return function (path) {
          return _this2._filter(path);
        };
      }
    }, {
      key: 'ignores',
      value: function ignores(path) {
        return !this._filter(path);
      }
    }, {
      key: '_createRule',
      value: function _createRule(pattern) {
        var origin = pattern;
        var negative = false;
  
        // > An optional prefix "!" which negates the pattern;
        if (pattern.indexOf('!') === 0) {
          negative = true;
          pattern = pattern.substr(1);
        }
  
        pattern = pattern
        // > Put a backslash ("\") in front of the first "!" for patterns that begin with a literal "!", for example, `"\!important!.txt"`.
        .replace(REGEX_LEADING_EXCAPED_EXCLAMATION, '!')
        // > Put a backslash ("\") in front of the first hash for patterns that begin with a hash.
        .replace(REGEX_LEADING_EXCAPED_HASH, '#');
  
        var regex = make_regex(pattern, negative);
  
        return {
          origin: origin,
          pattern: pattern,
          negative: negative,
          regex: regex
        };
      }
  
      // @returns `Boolean` true if the `path` is NOT ignored
  
    }, {
      key: '_filter',
      value: function _filter(path, slices) {
        if (!path) {
          return false;
        }
  
        if (path in this._cache) {
          return this._cache[path];
        }
  
        if (!slices) {
          // path/to/a.js
          // ['path', 'to', 'a.js']
          slices = path.split(SLASH);
        }
  
        slices.pop();
  
        return this._cache[path] = slices.length
        // > It is not possible to re-include a file if a parent directory of that file is excluded.
        // If the path contains a parent directory, check the parent first
        ? this._filter(slices.join(SLASH) + SLASH, slices) && this._test(path)
  
        // Or only test the path
        : this._test(path);
      }
  
      // @returns {Boolean} true if a file is NOT ignored
  
    }, {
      key: '_test',
      value: function _test(path) {
        // Explicitly define variable type by setting matched to `0`
        var matched = 0;
  
        this._rules.forEach(function (rule) {
          // if matched = true, then we only test negative rules
          // if matched = false, then we test non-negative rules
          if (!(matched ^ rule.negative)) {
            matched = rule.negative ^ rule.regex.test(path);
          }
        });
  
        return !matched;
      }
    }]);
  
    return IgnoreBase;
  }();
  
  // > If the pattern ends with a slash,
  // > it is removed for the purpose of the following description,
  // > but it would only find a match with a directory.
  // > In other words, foo/ will match a directory foo and paths underneath it,
  // > but will not match a regular file or a symbolic link foo
  // >  (this is consistent with the way how pathspec works in general in Git).
  // '`foo/`' will not match regular file '`foo`' or symbolic link '`foo`'
  // -> ignore-rules will not deal with it, because it costs extra `fs.stat` call
  //      you could use option `mark: true` with `glob`
  
  // '`foo/`' should not continue with the '`..`'
  
  
  var DEFAULT_REPLACER_PREFIX = [
  
  // > Trailing spaces are ignored unless they are quoted with backslash ("\")
  [
  // (a\ ) -> (a )
  // (a  ) -> (a)
  // (a \ ) -> (a  )
  /\\?\s+$/, function (match) {
    return match.indexOf('\\') === 0 ? ' ' : '';
  }],
  
  // replace (\ ) with ' '
  [/\\\s/g, function () {
    return ' ';
  }],
  
  // Escape metacharacters
  // which is written down by users but means special for regular expressions.
  
  // > There are 12 characters with special meanings:
  // > - the backslash \,
  // > - the caret ^,
  // > - the dollar sign $,
  // > - the period or dot .,
  // > - the vertical bar or pipe symbol |,
  // > - the question mark ?,
  // > - the asterisk or star *,
  // > - the plus sign +,
  // > - the opening parenthesis (,
  // > - the closing parenthesis ),
  // > - and the opening square bracket [,
  // > - the opening curly brace {,
  // > These special characters are often called "metacharacters".
  [/[\\\^$.|?*+()\[{]/g, function (match) {
    return '\\' + match;
  }],
  
  // leading slash
  [
  
  // > A leading slash matches the beginning of the pathname.
  // > For example, "/*.c" matches "cat-file.c" but not "mozilla-sha1/sha1.c".
  // A leading slash matches the beginning of the pathname
  /^\//, function () {
    return '^';
  }],
  
  // replace special metacharacter slash after the leading slash
  [/\//g, function () {
    return '\\/';
  }], [
  // > A leading "**" followed by a slash means match in all directories.
  // > For example, "**/foo" matches file or directory "foo" anywhere,
  // > the same as pattern "foo".
  // > "**/foo/bar" matches file or directory "bar" anywhere that is directly under directory "foo".
  // Notice that the '*'s have been replaced as '\\*'
  /^\^*\\\*\\\*\\\//,
  
  // '**/foo' <-> 'foo'
  function () {
    return '^(?:.*\\/)?';
  }]];
  
  var DEFAULT_REPLACER_SUFFIX = [
  // starting
  [
  // there will be no leading '/' (which has been replaced by section "leading slash")
  // If starts with '**', adding a '^' to the regular expression also works
  /^(?=[^\^])/, function () {
    return !/\/(?!$)/.test(this)
    // > If the pattern does not contain a slash /, Git treats it as a shell glob pattern
    // Actually, if there is only a trailing slash, git also treats it as a shell glob pattern
    ? '(?:^|\\/)'
  
    // > Otherwise, Git treats the pattern as a shell glob suitable for consumption by fnmatch(3)
    : '^';
  }],
  
  // two globstars
  [
  // Use lookahead assertions so that we could match more than one `'/**'`
  /\\\/\\\*\\\*(?=\\\/|$)/g,
  
  // Zero, one or several directories
  // should not use '*', or it will be replaced by the next replacer
  
  // Check if it is not the last `'/**'`
  function (match, index, str) {
    return index + 6 < str.length
  
    // case: /**/
    // > A slash followed by two consecutive asterisks then a slash matches zero or more directories.
    // > For example, "a/**/b" matches "a/b", "a/x/b", "a/x/y/b" and so on.
    // '/**/'
    ? '(?:\\/[^\\/]+)*'
  
    // case: /**
    // > A trailing `"/**"` matches everything inside.
  
    // #21: everything inside but it should not include the current folder
    : '\\/.+';
  }],
  
  // intermediate wildcards
  [
  // Never replace escaped '*'
  // ignore rule '\*' will match the path '*'
  
  // 'abc.*/' -> go
  // 'abc.*'  -> skip this rule
  /(^|[^\\]+)\\\*(?=.+)/g,
  
  // '*.js' matches '.js'
  // '*.js' doesn't match 'abc'
  function (match, p1) {
    return p1 + '[^\\/]*';
  }],
  
  // trailing wildcard
  [/(\^|\\\/)?\\\*$/, function (match, p1) {
    return (p1
    // '\^':
    // '/*' does not match ''
    // '/*' does not match everything
  
    // '\\\/':
    // 'abc/*' does not match 'abc/'
    ? p1 + '[^/]+'
  
    // 'a*' matches 'a'
    // 'a*' matches 'aa'
    : '[^/]*') + '(?=$|\\/$)';
  }], [
  // unescape
  /\\\\\\/g, function () {
    return '\\';
  }]];
  
  var POSITIVE_REPLACERS = [].concat(DEFAULT_REPLACER_PREFIX, [
  
  // 'f'
  // matches
  // - /f(end)
  // - /f/
  // - (start)f(end)
  // - (start)f/
  // doesn't match
  // - oof
  // - foo
  // pseudo:
  // -> (^|/)f(/|$)
  
  // ending
  [
  // 'js' will not match 'js.'
  // 'ab' will not match 'abc'
  /(?:[^*\/])$/,
  
  // 'js*' will not match 'a.js'
  // 'js/' will not match 'a.js'
  // 'js' will match 'a.js' and 'a.js/'
  function (match) {
    return match + '(?=$|\\/)';
  }]], DEFAULT_REPLACER_SUFFIX);
  
  var NEGATIVE_REPLACERS = [].concat(DEFAULT_REPLACER_PREFIX, [
  
  // #24, #38
  // The MISSING rule of [gitignore docs](https://git-scm.com/docs/gitignore)
  // A negative pattern without a trailing wildcard should not
  // re-include the things inside that directory.
  
  // eg:
  // ['node_modules/*', '!node_modules']
  // should ignore `node_modules/a.js`
  [/(?:[^*])$/, function (match) {
    return match + '(?=$|\\/$)';
  }]], DEFAULT_REPLACER_SUFFIX);
  
  // A simple cache, because an ignore rule only has only one certain meaning
  var cache = {};
  
  // @param {pattern}
  function make_regex(pattern, negative) {
    var r = cache[pattern];
    if (r) {
      return r;
    }
  
    var replacers = negative ? NEGATIVE_REPLACERS : POSITIVE_REPLACERS;
  
    var source = replacers.reduce(function (prev, current) {
      return prev.replace(current[0], current[1].bind(pattern));
    }, pattern);
  
    return cache[pattern] = new RegExp(source, 'i');
  }
  
  // Windows
  // --------------------------------------------------------------
  /* istanbul ignore if  */
  if (
  // Detect `process` so that it can run in browsers.
  typeof process !== 'undefined' && (process.env && process.env.IGNORE_TEST_WIN32 || process.platform === 'win32')) {
  
    var filter = IgnoreBase.prototype._filter;
    var make_posix = function make_posix(str) {
      return (/^\\\\\?\\/.test(str) || /[^\x00-\x80]+/.test(str) ? str : str.replace(/\\/g, '/')
      );
    };
  
    IgnoreBase.prototype._filter = function (path, slices) {
      path = make_posix(path);
      return filter.call(this, path, slices);
    };
  }
  