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Edit File: minimatch.js

module.exports = minimatch
minimatch.Minimatch = Minimatch

var path = (function () { try { return require('path') } catch (e) {}}()) || {
  sep: '/'
}
minimatch.sep = path.sep

var GLOBSTAR = minimatch.GLOBSTAR = Minimatch.GLOBSTAR = {}
var expand = require('brace-expansion')

var plTypes = {
  '!': { open: '(?:(?!(?:', close: '))[^/]*?)'},
  '?': { open: '(?:', close: ')?' },
  '+': { open: '(?:', close: ')+' },
  '*': { open: '(?:', close: ')*' },
  '@': { open: '(?:', close: ')' }
}

// any single thing other than /
// don't need to escape / when using new RegExp()
var qmark = '[^/]'

// * => any number of characters
var star = qmark + '*?'

// ** when dots are allowed.  Anything goes, except .. and .
// not (^ or / followed by one or two dots followed by $ or /),
// followed by anything, any number of times.
var twoStarDot = '(?:(?!(?:\\\/|^)(?:\\.{1,2})($|\\\/)).)*?'

// not a ^ or / followed by a dot,
// followed by anything, any number of times.
var twoStarNoDot = '(?:(?!(?:\\\/|^)\\.).)*?'

// characters that need to be escaped in RegExp.
var reSpecials = charSet('().*{}+?[]^$\\!')

// "abc" -> { a:true, b:true, c:true }
function charSet (s) {
  return s.split('').reduce(function (set, c) {
    set[c] = true
    return set
  }, {})
}

// normalizes slashes.
var slashSplit = /\/+/

minimatch.filter = filter
function filter (pattern, options) {
  options = options || {}
  return function (p, i, list) {
    return minimatch(p, pattern, options)
  }
}

function ext (a, b) {
  b = b || {}
  var t = {}
  Object.keys(a).forEach(function (k) {
    t[k] = a[k]
  })
  Object.keys(b).forEach(function (k) {
    t[k] = b[k]
  })
  return t
}

minimatch.defaults = function (def) {
  if (!def || typeof def !== 'object' || !Object.keys(def).length) {
    return minimatch
  }

var orig = minimatch

var m = function minimatch (p, pattern, options) {
    return orig(p, pattern, ext(def, options))
  }

m.Minimatch = function Minimatch (pattern, options) {
    return new orig.Minimatch(pattern, ext(def, options))
  }
  m.Minimatch.defaults = function defaults (options) {
    return orig.defaults(ext(def, options)).Minimatch
  }

m.filter = function filter (pattern, options) {
    return orig.filter(pattern, ext(def, options))
  }

m.defaults = function defaults (options) {
    return orig.defaults(ext(def, options))
  }

m.makeRe = function makeRe (pattern, options) {
    return orig.makeRe(pattern, ext(def, options))
  }

m.braceExpand = function braceExpand (pattern, options) {
    return orig.braceExpand(pattern, ext(def, options))
  }

m.match = function (list, pattern, options) {
    return orig.match(list, pattern, ext(def, options))
  }

return m
}

Minimatch.defaults = function (def) {
  return minimatch.defaults(def).Minimatch
}

function minimatch (p, pattern, options) {
  assertValidPattern(pattern)

if (!options) options = {}

// shortcut: comments match nothing.
  if (!options.nocomment && pattern.charAt(0) === '#') {
    return false
  }

return new Minimatch(pattern, options).match(p)
}

function Minimatch (pattern, options) {
  if (!(this instanceof Minimatch)) {
    return new Minimatch(pattern, options)
  }

assertValidPattern(pattern)

if (!options) options = {}

pattern = pattern.trim()

// windows support: need to use /, not \
  if (!options.allowWindowsEscape && path.sep !== '/') {
    pattern = pattern.split(path.sep).join('/')
  }

this.options = options
  this.set = []
  this.pattern = pattern
  this.regexp = null
  this.negate = false
  this.comment = false
  this.empty = false
  this.partial = !!options.partial

// make the set of regexps etc.
  this.make()
}

Minimatch.prototype.debug = function () {}

Minimatch.prototype.make = make
function make () {
  var pattern = this.pattern
  var options = this.options

// empty patterns and comments match nothing.
  if (!options.nocomment && pattern.charAt(0) === '#') {
    this.comment = true
    return
  }
  if (!pattern) {
    this.empty = true
    return
  }

// step 1: figure out negation, etc.
  this.parseNegate()

// step 2: expand braces
  var set = this.globSet = this.braceExpand()

if (options.debug) this.debug = function debug() { console.error.apply(console, arguments) }

this.debug(this.pattern, set)

// step 3: now we have a set, so turn each one into a series of path-portion
  // matching patterns.
  // These will be regexps, except in the case of "**", which is
  // set to the GLOBSTAR object for globstar behavior,
  // and will not contain any / characters
  set = this.globParts = set.map(function (s) {
    return s.split(slashSplit)
  })

this.debug(this.pattern, set)

// glob --> regexps
  set = set.map(function (s, si, set) {
    return s.map(this.parse, this)
  }, this)

this.debug(this.pattern, set)

// filter out everything that didn't compile properly.
  set = set.filter(function (s) {
    return s.indexOf(false) === -1
  })

this.debug(this.pattern, set)

this.set = set
}

Minimatch.prototype.parseNegate = parseNegate
function parseNegate () {
  var pattern = this.pattern
  var negate = false
  var options = this.options
  var negateOffset = 0

if (options.nonegate) return

for (var i = 0, l = pattern.length
    ; i < l && pattern.charAt(i) === '!'
    ; i++) {
    negate = !negate
    negateOffset++
  }

if (negateOffset) this.pattern = pattern.substr(negateOffset)
  this.negate = negate
}

// Brace expansion:
// a{b,c}d -> abd acd
// a{b,}c -> abc ac
// a{0..3}d -> a0d a1d a2d a3d
// a{b,c{d,e}f}g -> abg acdfg acefg
// a{b,c}d{e,f}g -> abdeg acdeg abdeg abdfg
//
// Invalid sets are not expanded.
// a{2..}b -> a{2..}b
// a{b}c -> a{b}c
minimatch.braceExpand = function (pattern, options) {
  return braceExpand(pattern, options)
}

Minimatch.prototype.braceExpand = braceExpand

function braceExpand (pattern, options) {
  if (!options) {
    if (this instanceof Minimatch) {
      options = this.options
    } else {
      options = {}
    }
  }

pattern = typeof pattern === 'undefined'
    ? this.pattern : pattern

assertValidPattern(pattern)

// Thanks to Yeting Li <https://github.com/yetingli> for
  // improving this regexp to avoid a ReDOS vulnerability.
  if (options.nobrace || !/\{(?:(?!\{).)*\}/.test(pattern)) {
    // shortcut. no need to expand.
    return [pattern]
  }

return expand(pattern)
}

var MAX_PATTERN_LENGTH = 1024 * 64
var assertValidPattern = function (pattern) {
  if (typeof pattern !== 'string') {
    throw new TypeError('invalid pattern')
  }

if (pattern.length > MAX_PATTERN_LENGTH) {
    throw new TypeError('pattern is too long')
  }
}

// parse a component of the expanded set.
// At this point, no pattern may contain "/" in it
// so we're going to return a 2d array, where each entry is the full
// pattern, split on '/', and then turned into a regular expression.
// A regexp is made at the end which joins each array with an
// escaped /, and another full one which joins each regexp with |.
//
// Following the lead of Bash 4.1, note that "**" only has special meaning
// when it is the *only* thing in a path portion.  Otherwise, any series
// of * is equivalent to a single *.  Globstar behavior is enabled by
// default, and can be disabled by setting options.noglobstar.
Minimatch.prototype.parse = parse
var SUBPARSE = {}
function parse (pattern, isSub) {
  assertValidPattern(pattern)

var options = this.options

// shortcuts
  if (pattern === '**') {
    if (!options.noglobstar)
      return GLOBSTAR
    else
      pattern = '*'
  }
  if (pattern === '') return ''

var re = ''
  var hasMagic = !!options.nocase
  var escaping = false
  // ? => one single character
  var patternListStack = []
  var negativeLists = []
  var stateChar
  var inClass = false
  var reClassStart = -1
  var classStart = -1
  // . and .. never match anything that doesn't start with .,
  // even when options.dot is set.
  var patternStart = pattern.charAt(0) === '.' ? '' // anything
  // not (start or / followed by . or .. followed by / or end)
  : options.dot ? '(?!(?:^|\\\/)\\.{1,2}(?:$|\\\/))'
  : '(?!\\.)'
  var self = this

function clearStateChar () {
    if (stateChar) {
      // we had some state-tracking character
      // that wasn't consumed by this pass.
      switch (stateChar) {
        case '*':
          re += star
          hasMagic = true
        break
        case '?':
          re += qmark
          hasMagic = true
        break
        default:
          re += '\\' + stateChar
        break
      }
      self.debug('clearStateChar %j %j', stateChar, re)
      stateChar = false
    }
  }

for (var i = 0, len = pattern.length, c
    ; (i < len) && (c = pattern.charAt(i))
    ; i++) {
    this.debug('%s\t%s %s %j', pattern, i, re, c)

// skip over any that are escaped.
    if (escaping && reSpecials[c]) {
      re += '\\' + c
      escaping = false
      continue
    }

switch (c) {
      /* istanbul ignore next */
      case '/': {
        // completely not allowed, even escaped.
        // Should already be path-split by now.
        return false
      }

case '\\':
        clearStateChar()
        escaping = true
      continue

// the various stateChar values
      // for the "extglob" stuff.
      case '?':
      case '*':
      case '+':
      case '@':
      case '!':
        this.debug('%s\t%s %s %j <-- stateChar', pattern, i, re, c)

// all of those are literals inside a class, except that
        // the glob [!a] means [^a] in regexp
        if (inClass) {
          this.debug('  in class')
          if (c === '!' && i === classStart + 1) c = '^'
          re += c
          continue
        }

// if we already have a stateChar, then it means
        // that there was something like ** or +? in there.
        // Handle the stateChar, then proceed with this one.
        self.debug('call clearStateChar %j', stateChar)
        clearStateChar()
        stateChar = c
        // if extglob is disabled, then +(asdf|foo) isn't a thing.
        // just clear the statechar *now*, rather than even diving into
        // the patternList stuff.
        if (options.noext) clearStateChar()
      continue

case '(':
        if (inClass) {
          re += '('
          continue
        }

if (!stateChar) {
          re += '\\('
          continue
        }

patternListStack.push({
          type: stateChar,
          start: i - 1,
          reStart: re.length,
          open: plTypes[stateChar].open,
          close: plTypes[stateChar].close
        })
        // negation is (?:(?!js)[^/]*)
        re += stateChar === '!' ? '(?:(?!(?:' : '(?:'
        this.debug('plType %j %j', stateChar, re)
        stateChar = false
      continue

case ')':
        if (inClass || !patternListStack.length) {
          re += '\\)'
          continue
        }

clearStateChar()
        hasMagic = true
        var pl = patternListStack.pop()
        // negation is (?:(?!js)[^/]*)
        // The others are (?:<pattern>)<type>
        re += pl.close
        if (pl.type === '!') {
          negativeLists.push(pl)
        }
        pl.reEnd = re.length
      continue

case '|':
        if (inClass || !patternListStack.length || escaping) {
          re += '\\|'
          escaping = false
          continue
        }

clearStateChar()
        re += '|'
      continue

// these are mostly the same in regexp and glob
      case '[':
        // swallow any state-tracking char before the [
        clearStateChar()

if (inClass) {
          re += '\\' + c
          continue
        }

inClass = true
        classStart = i
        reClassStart = re.length
        re += c
      continue

case ']':
        //  a right bracket shall lose its special
        //  meaning and represent itself in
        //  a bracket expression if it occurs
        //  first in the list.  -- POSIX.2 2.8.3.2
        if (i === classStart + 1 || !inClass) {
          re += '\\' + c
          escaping = false
          continue
        }

// handle the case where we left a class open.
        // "[z-a]" is valid, equivalent to "\[z-a\]"
        // split where the last [ was, make sure we don't have
        // an invalid re. if so, re-walk the contents of the
        // would-be class to re-translate any characters that
        // were passed through as-is
        // TODO: It would probably be faster to determine this
        // without a try/catch and a new RegExp, but it's tricky
        // to do safely.  For now, this is safe and works.
        var cs = pattern.substring(classStart + 1, i)
        try {
          RegExp('[' + cs + ']')
        } catch (er) {
          // not a valid class!
          var sp = this.parse(cs, SUBPARSE)
          re = re.substr(0, reClassStart) + '\\[' + sp[0] + '\\]'
          hasMagic = hasMagic || sp[1]
          inClass = false
          continue
        }

// finish up the class.
        hasMagic = true
        inClass = false
        re += c
      continue

default:
        // swallow any state char that wasn't consumed
        clearStateChar()

if (escaping) {
          // no need
          escaping = false
        } else if (reSpecials[c]
          && !(c === '^' && inClass)) {
          re += '\\'
        }

re += c

} // switch
  } // for

// handle the case where we left a class open.
  // "[abc" is valid, equivalent to "\[abc"
  if (inClass) {
    // split where the last [ was, and escape it
    // this is a huge pita.  We now have to re-walk
    // the contents of the would-be class to re-translate
    // any characters that were passed through as-is
    cs = pattern.substr(classStart + 1)
    sp = this.parse(cs, SUBPARSE)
    re = re.substr(0, reClassStart) + '\\[' + sp[0]
    hasMagic = hasMagic || sp[1]
  }

// handle the case where we had a +( thing at the *end*
  // of the pattern.
  // each pattern list stack adds 3 chars, and we need to go through
  // and escape any | chars that were passed through as-is for the regexp.
  // Go through and escape them, taking care not to double-escape any
  // | chars that were already escaped.
  for (pl = patternListStack.pop(); pl; pl = patternListStack.pop()) {
    var tail = re.slice(pl.reStart + pl.open.length)
    this.debug('setting tail', re, pl)
    // maybe some even number of \, then maybe 1 \, followed by a |
    tail = tail.replace(/((?:\\{2}){0,64})(\\?)\|/g, function (_, $1, $2) {
      if (!$2) {
        // the | isn't already escaped, so escape it.
        $2 = '\\'
      }

// need to escape all those slashes *again*, without escaping the
      // one that we need for escaping the | character.  As it works out,
      // escaping an even number of slashes can be done by simply repeating
      // it exactly after itself.  That's why this trick works.
      //
      // I am sorry that you have to see this.
      return $1 + $1 + $2 + '|'
    })

this.debug('tail=%j\n   %s', tail, tail, pl, re)
    var t = pl.type === '*' ? star
      : pl.type === '?' ? qmark
      : '\\' + pl.type

hasMagic = true
    re = re.slice(0, pl.reStart) + t + '\\(' + tail
  }

// handle trailing things that only matter at the very end.
  clearStateChar()
  if (escaping) {
    // trailing \\
    re += '\\\\'
  }

// only need to apply the nodot start if the re starts with
  // something that could conceivably capture a dot
  var addPatternStart = false
  switch (re.charAt(0)) {
    case '[': case '.': case '(': addPatternStart = true
  }

// Hack to work around lack of negative lookbehind in JS
  // A pattern like: *.!(x).!(y|z) needs to ensure that a name
  // like 'a.xyz.yz' doesn't match.  So, the first negative
  // lookahead, has to look ALL the way ahead, to the end of
  // the pattern.
  for (var n = negativeLists.length - 1; n > -1; n--) {
    var nl = negativeLists[n]

var nlBefore = re.slice(0, nl.reStart)
    var nlFirst = re.slice(nl.reStart, nl.reEnd - 8)
    var nlLast = re.slice(nl.reEnd - 8, nl.reEnd)
    var nlAfter = re.slice(nl.reEnd)

nlLast += nlAfter

// Handle nested stuff like *(*.js|!(*.json)), where open parens
    // mean that we should *not* include the ) in the bit that is considered
    // "after" the negated section.
    var openParensBefore = nlBefore.split('(').length - 1
    var cleanAfter = nlAfter
    for (i = 0; i < openParensBefore; i++) {
      cleanAfter = cleanAfter.replace(/\)[+*?]?/, '')
    }
    nlAfter = cleanAfter

var dollar = ''
    if (nlAfter === '' && isSub !== SUBPARSE) {
      dollar = '$'
    }
    var newRe = nlBefore + nlFirst + nlAfter + dollar + nlLast
    re = newRe
  }

// if the re is not "" at this point, then we need to make sure
  // it doesn't match against an empty path part.
  // Otherwise a/* will match a/, which it should not.
  if (re !== '' && hasMagic) {
    re = '(?=.)' + re
  }

if (addPatternStart) {
    re = patternStart + re
  }

// parsing just a piece of a larger pattern.
  if (isSub === SUBPARSE) {
    return [re, hasMagic]
  }

// skip the regexp for non-magical patterns
  // unescape anything in it, though, so that it'll be
  // an exact match against a file etc.
  if (!hasMagic) {
    return globUnescape(pattern)
  }

var flags = options.nocase ? 'i' : ''
  try {
    var regExp = new RegExp('^' + re + '$', flags)
  } catch (er) /* istanbul ignore next - should be impossible */ {
    // If it was an invalid regular expression, then it can't match
    // anything.  This trick looks for a character after the end of
    // the string, which is of course impossible, except in multi-line
    // mode, but it's not a /m regex.
    return new RegExp('$.')
  }

regExp._glob = pattern
  regExp._src = re

return regExp
}

minimatch.makeRe = function (pattern, options) {
  return new Minimatch(pattern, options || {}).makeRe()
}

Minimatch.prototype.makeRe = makeRe
function makeRe () {
  if (this.regexp || this.regexp === false) return this.regexp

// at this point, this.set is a 2d array of partial
  // pattern strings, or "**".
  //
  // It's better to use .match().  This function shouldn't
  // be used, really, but it's pretty convenient sometimes,
  // when you just want to work with a regex.
  var set = this.set

if (!set.length) {
    this.regexp = false
    return this.regexp
  }
  var options = this.options

var twoStar = options.noglobstar ? star
    : options.dot ? twoStarDot
    : twoStarNoDot
  var flags = options.nocase ? 'i' : ''

var re = set.map(function (pattern) {
    return pattern.map(function (p) {
      return (p === GLOBSTAR) ? twoStar
      : (typeof p === 'string') ? regExpEscape(p)
      : p._src
    }).join('\\\/')
  }).join('|')

// must match entire pattern
  // ending in a * or ** will make it less strict.
  re = '^(?:' + re + ')$'

// can match anything, as long as it's not this.
  if (this.negate) re = '^(?!' + re + ').*$'

try {
    this.regexp = new RegExp(re, flags)
  } catch (ex) /* istanbul ignore next - should be impossible */ {
    this.regexp = false
  }
  return this.regexp
}

minimatch.match = function (list, pattern, options) {
  options = options || {}
  var mm = new Minimatch(pattern, options)
  list = list.filter(function (f) {
    return mm.match(f)
  })
  if (mm.options.nonull && !list.length) {
    list.push(pattern)
  }
  return list
}

Minimatch.prototype.match = function match (f, partial) {
  if (typeof partial === 'undefined') partial = this.partial
  this.debug('match', f, this.pattern)
  // short-circuit in the case of busted things.
  // comments, etc.
  if (this.comment) return false
  if (this.empty) return f === ''

if (f === '/' && partial) return true

var options = this.options

// windows: need to use /, not \
  if (path.sep !== '/') {
    f = f.split(path.sep).join('/')
  }

// treat the test path as a set of pathparts.
  f = f.split(slashSplit)
  this.debug(this.pattern, 'split', f)

// just ONE of the pattern sets in this.set needs to match
  // in order for it to be valid.  If negating, then just one
  // match means that we have failed.
  // Either way, return on the first hit.

var set = this.set
  this.debug(this.pattern, 'set', set)

// Find the basename of the path by looking for the last non-empty segment
  var filename
  var i
  for (i = f.length - 1; i >= 0; i--) {
    filename = f[i]
    if (filename) break
  }

for (i = 0; i < set.length; i++) {
    var pattern = set[i]
    var file = f
    if (options.matchBase && pattern.length === 1) {
      file = [filename]
    }
    var hit = this.matchOne(file, pattern, partial)
    if (hit) {
      if (options.flipNegate) return true
      return !this.negate
    }
  }

// didn't get any hits.  this is success if it's a negative
  // pattern, failure otherwise.
  if (options.flipNegate) return false
  return this.negate
}

// set partial to true to test if, for example,
// "/a/b" matches the start of "/*/b/*/d"
// Partial means, if you run out of file before you run
// out of pattern, then that's fine, as long as all
// the parts match.
Minimatch.prototype.matchOne = function (file, pattern, partial) {
  var options = this.options

this.debug('matchOne',
    { 'this': this, file: file, pattern: pattern })

this.debug('matchOne', file.length, pattern.length)

for (var fi = 0,
      pi = 0,
      fl = file.length,
      pl = pattern.length
      ; (fi < fl) && (pi < pl)
      ; fi++, pi++) {
    this.debug('matchOne loop')
    var p = pattern[pi]
    var f = file[fi]

this.debug(pattern, p, f)

// should be impossible.
    // some invalid regexp stuff in the set.
    /* istanbul ignore if */
    if (p === false) return false

if (p === GLOBSTAR) {
      this.debug('GLOBSTAR', [pattern, p, f])

// "**"
      // a/**/b/**/c would match the following:
      // a/b/x/y/z/c
      // a/x/y/z/b/c
      // a/b/x/b/x/c
      // a/b/c
      // To do this, take the rest of the pattern after
      // the **, and see if it would match the file remainder.
      // If so, return success.
      // If not, the ** "swallows" a segment, and try again.
      // This is recursively awful.
      //
      // a/**/b/**/c matching a/b/x/y/z/c
      // - a matches a
      // - doublestar
      //   - matchOne(b/x/y/z/c, b/**/c)
      //     - b matches b
      //     - doublestar
      //       - matchOne(x/y/z/c, c) -> no
      //       - matchOne(y/z/c, c) -> no
      //       - matchOne(z/c, c) -> no
      //       - matchOne(c, c) yes, hit
      var fr = fi
      var pr = pi + 1
      if (pr === pl) {
        this.debug('** at the end')
        // a ** at the end will just swallow the rest.
        // We have found a match.
        // however, it will not swallow /.x, unless
        // options.dot is set.
        // . and .. are *never* matched by **, for explosively
        // exponential reasons.
        for (; fi < fl; fi++) {
          if (file[fi] === '.' || file[fi] === '..' ||
            (!options.dot && file[fi].charAt(0) === '.')) return false
        }
        return true
      }

// ok, let's see if we can swallow whatever we can.
      while (fr < fl) {
        var swallowee = file[fr]

this.debug('\nglobstar while', file, fr, pattern, pr, swallowee)

// XXX remove this slice.  Just pass the start index.
        if (this.matchOne(file.slice(fr), pattern.slice(pr), partial)) {
          this.debug('globstar found match!', fr, fl, swallowee)
          // found a match.
          return true
        } else {
          // can't swallow "." or ".." ever.
          // can only swallow ".foo" when explicitly asked.
          if (swallowee === '.' || swallowee === '..' ||
            (!options.dot && swallowee.charAt(0) === '.')) {
            this.debug('dot detected!', file, fr, pattern, pr)
            break
          }

// ** swallows a segment, and continue.
          this.debug('globstar swallow a segment, and continue')
          fr++
        }
      }

// no match was found.
      // However, in partial mode, we can't say this is necessarily over.
      // If there's more *pattern* left, then
      /* istanbul ignore if */
      if (partial) {
        // ran out of file
        this.debug('\n>>> no match, partial?', file, fr, pattern, pr)
        if (fr === fl) return true
      }
      return false
    }

// something other than **
    // non-magic patterns just have to match exactly
    // patterns with magic have been turned into regexps.
    var hit
    if (typeof p === 'string') {
      hit = f === p
      this.debug('string match', p, f, hit)
    } else {
      hit = f.match(p)
      this.debug('pattern match', p, f, hit)
    }

if (!hit) return false
  }

// Note: ending in / means that we'll get a final ""
  // at the end of the pattern.  This can only match a
  // corresponding "" at the end of the file.
  // If the file ends in /, then it can only match a
  // a pattern that ends in /, unless the pattern just
  // doesn't have any more for it. But, a/b/ should *not*
  // match "a/b/*", even though "" matches against the
  // [^/]*? pattern, except in partial mode, where it might
  // simply not be reached yet.
  // However, a/b/ should still satisfy a/*

// now either we fell off the end of the pattern, or we're done.
  if (fi === fl && pi === pl) {
    // ran out of pattern and filename at the same time.
    // an exact hit!
    return true
  } else if (fi === fl) {
    // ran out of file, but still had pattern left.
    // this is ok if we're doing the match as part of
    // a glob fs traversal.
    return partial
  } else /* istanbul ignore else */ if (pi === pl) {
    // ran out of pattern, still have file left.
    // this is only acceptable if we're on the very last
    // empty segment of a file with a trailing slash.
    // a/* should match a/b/
    return (fi === fl - 1) && (file[fi] === '')
  }

// should be unreachable.
  /* istanbul ignore next */
  throw new Error('wtf?')
}

// replace stuff like \* with *
function globUnescape (s) {
  return s.replace(/\\(.)/g, '$1')
}

function regExpEscape (s) {
  return s.replace(/[-[\]{}()*+?.,\\^$|#\s]/g, '\\$&')
}

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