text: // Approach:
  //
  // 1. Get the minimatch set
  // 2. For each pattern in the set, PROCESS(pattern, false)
  // 3. Store matches per-set, then uniq them
  //
  // PROCESS(pattern, inGlobStar)
  // Get the first [n] items from pattern that are all strings
  // Join these together.  This is PREFIX.
  //   If there is no more remaining, then stat(PREFIX) and
  //   add to matches if it succeeds.  END.
  //
  // If inGlobStar and PREFIX is symlink and points to dir
  //   set ENTRIES = []
  // else readdir(PREFIX) as ENTRIES
  //   If fail, END
  //
  // with ENTRIES
  //   If pattern[n] is GLOBSTAR
  //     // handle the case where the globstar match is empty
  //     // by pruning it out, and testing the resulting pattern
  //     PROCESS(pattern[0..n] + pattern[n+1 .. $], false)
  //     // handle other cases.
  //     for ENTRY in ENTRIES (not dotfiles)
  //       // attach globstar + tail onto the entry
  //       // Mark that this entry is a globstar match
  //       PROCESS(pattern[0..n] + ENTRY + pattern[n .. $], true)
  //
  //   else // not globstar
  //     for ENTRY in ENTRIES (not dotfiles, unless pattern[n] is dot)
  //       Test ENTRY against pattern[n]
  //       If fails, continue
  //       If passes, PROCESS(pattern[0..n] + item + pattern[n+1 .. $])
  //
  // Caveat:
  //   Cache all stats and readdirs results to minimize syscall.  Since all
  //   we ever care about is existence and directory-ness, we can just keep
  //   `true` for files, and [children,...] for directories, or `false` for
  //   things that don't exist.
  
  module.exports = glob
  
  var fs = require('fs')
  var minimatch = require('minimatch')
  var Minimatch = minimatch.Minimatch
  var inherits = require('inherits')
  var EE = require('events').EventEmitter
  var path = require('path')
  var assert = require('assert')
  var isAbsolute = require('path-is-absolute')
  var globSync = require('./sync.js')
  var common = require('./common.js')
  var alphasort = common.alphasort
  var alphasorti = common.alphasorti
  var setopts = common.setopts
  var ownProp = common.ownProp
  var inflight = require('inflight')
  var util = require('util')
  var childrenIgnored = common.childrenIgnored
  var isIgnored = common.isIgnored
  
  var once = require('once')
  
  function glob(pattern, options, cb) {
      if (typeof options === 'function') cb = options, options = {}
      if (!options) options = {}
  
      if (options.sync) {
          if (cb)
              throw new TypeError('callback provided to sync glob')
          return globSync(pattern, options)
      }
  
      return new Glob(pattern, options, cb)
  }
  
  glob.sync = globSync
  var GlobSync = glob.GlobSync = globSync.GlobSync
  
  // old api surface
  glob.glob = glob
  
  glob.hasMagic = function (pattern, options_) {
      var options = util._extend({}, options_)
      options.noprocess = true
  
      var g = new Glob(pattern, options)
      var set = g.minimatch.set
      if (set.length > 1)
          return true
  
      for (var j = 0; j < set[0].length; j++) {
          if (typeof set[0][j] !== 'string')
              return true
      }
  
      return false
  }
  
  glob.Glob = Glob
  inherits(Glob, EE)
  function Glob(pattern, options, cb) {
      if (typeof options === 'function') {
          cb = options
          options = null
      }
  
      if (options && options.sync) {
          if (cb)
              throw new TypeError('callback provided to sync glob')
          return new GlobSync(pattern, options)
      }
  
      if (!(this instanceof Glob))
          return new Glob(pattern, options, cb)
  
      setopts(this, pattern, options)
      this._didRealPath = false
  
      // process each pattern in the minimatch set
      var n = this.minimatch.set.length
  
      // The matches are stored as {<filename>: true,...} so that
      // duplicates are automagically pruned.
      // Later, we do an Object.keys() on these.
      // Keep them as a list so we can fill in when nonull is set.
      this.matches = new Array(n)
  
      if (typeof cb === 'function') {
          cb = once(cb)
          this.on('error', cb)
          this.on('end', function (matches) {
              cb(null, matches)
          })
      }
  
      var self = this
      var n = this.minimatch.set.length
      this._processing = 0
      this.matches = new Array(n)
  
      this._emitQueue = []
      this._processQueue = []
      this.paused = false
  
      if (this.noprocess)
          return this
  
      if (n === 0)
          return done()
  
      for (var i = 0; i < n; i++) {
          this._process(this.minimatch.set[i], i, false, done)
      }
  
      function done() {
          --self._processing
          if (self._processing <= 0)
              self._finish()
      }
  }
  
  Glob.prototype._finish = function () {
      assert(this instanceof Glob)
      if (this.aborted)
          return
  
      if (this.realpath && !this._didRealpath)
          return this._realpath()
  
      common.finish(this)
      this.emit('end', this.found)
  }
  
  Glob.prototype._realpath = function () {
      if (this._didRealpath)
          return
  
      this._didRealpath = true
  
      var n = this.matches.length
      if (n === 0)
          return this._finish()
  
      var self = this
      for (var i = 0; i < this.matches.length; i++)
          this._realpathSet(i, next)
  
      function next() {
          if (--n === 0)
              self._finish()
      }
  }
  
  Glob.prototype._realpathSet = function (index, cb) {
      var matchset = this.matches[index]
      if (!matchset)
          return cb()
  
      var found = Object.keys(matchset)
      var self = this
      var n = found.length
  
      if (n === 0)
          return cb()
  
      var set = this.matches[index] = Object.create(null)
      found.forEach(function (p, i) {
          // If there's a problem with the stat, then it means that
          // one or more of the links in the realpath couldn't be
          // resolved.  just return the abs value in that case.
          p = self._makeAbs(p)
          fs.realpath(p, self.realpathCache, function (er, real) {
              if (!er)
                  set[real] = true
              else if (er.syscall === 'stat')
                  set[p] = true
              else
                  self.emit('error', er) // srsly wtf right here
  
              if (--n === 0) {
                  self.matches[index] = set
                  cb()
              }
          })
      })
  }
  
  Glob.prototype._mark = function (p) {
      return common.mark(this, p)
  }
  
  Glob.prototype._makeAbs = function (f) {
      return common.makeAbs(this, f)
  }
  
  Glob.prototype.abort = function () {
      this.aborted = true
      this.emit('abort')
  }
  
  Glob.prototype.pause = function () {
      if (!this.paused) {
          this.paused = true
          this.emit('pause')
      }
  }
  
  Glob.prototype.resume = function () {
      if (this.paused) {
          this.emit('resume')
          this.paused = false
          if (this._emitQueue.length) {
              var eq = this._emitQueue.slice(0)
              this._emitQueue.length = 0
              for (var i = 0; i < eq.length; i++) {
                  var e = eq[i]
                  this._emitMatch(e[0], e[1])
              }
          }
          if (this._processQueue.length) {
              var pq = this._processQueue.slice(0)
              this._processQueue.length = 0
              for (var i = 0; i < pq.length; i++) {
                  var p = pq[i]
                  this._processing--
                  this._process(p[0], p[1], p[2], p[3])
              }
          }
      }
  }
  
  Glob.prototype._process = function (pattern, index, inGlobStar, cb) {
      assert(this instanceof Glob)
      assert(typeof cb === 'function')
  
      if (this.aborted)
          return
  
      this._processing++
      if (this.paused) {
          this._processQueue.push([pattern, index, inGlobStar, cb])
          return
      }
  
      //console.error('PROCESS %d', this._processing, pattern)
  
      // Get the first [n] parts of pattern that are all strings.
      var n = 0
      while (typeof pattern[n] === 'string') {
          n++
      }
      // now n is the index of the first one that is *not* a string.
  
      // see if there's anything else
      var prefix
      switch (n) {
          // if not, then this is rather simple
          case pattern.length:
              this._processSimple(pattern.join('/'), index, cb)
              return
  
          case 0:
              // pattern *starts* with some non-trivial item.
              // going to readdir(cwd), but not include the prefix in matches.
              prefix = null
              break
  
          default:
              // pattern has some string bits in the front.
              // whatever it starts with, whether that's 'absolute' like /foo/bar,
              // or 'relative' like '../baz'
              prefix = pattern.slice(0, n).join('/')
              break
      }
  
      var remain = pattern.slice(n)
  
      // get the list of entries.
      var read
      if (prefix === null)
          read = '.'
      else if (isAbsolute(prefix) || isAbsolute(pattern.join('/'))) {
          if (!prefix || !isAbsolute(prefix))
              prefix = '/' + prefix
          read = prefix
      } else
          read = prefix
  
      var abs = this._makeAbs(read)
  
      //if ignored, skip _processing
      if (childrenIgnored(this, read))
          return cb()
  
      var isGlobStar = remain[0] === minimatch.GLOBSTAR
      if (isGlobStar)
          this._processGlobStar(prefix, read, abs, remain, index, inGlobStar, cb)
      else
          this._processReaddir(prefix, read, abs, remain, index, inGlobStar, cb)
  }
  
  Glob.prototype._processReaddir = function (prefix, read, abs, remain, index, inGlobStar, cb) {
      var self = this
      this._readdir(abs, inGlobStar, function (er, entries) {
          return self._processReaddir2(prefix, read, abs, remain, index, inGlobStar, entries, cb)
      })
  }
  
  Glob.prototype._processReaddir2 = function (prefix, read, abs, remain, index, inGlobStar, entries, cb) {
  
      // if the abs isn't a dir, then nothing can match!
      if (!entries)
          return cb()
  
      // It will only match dot entries if it starts with a dot, or if
      // dot is set.  Stuff like @(.foo|.bar) isn't allowed.
      var pn = remain[0]
      var negate = !!this.minimatch.negate
      var rawGlob = pn._glob
      var dotOk = this.dot || rawGlob.charAt(0) === '.'
  
      var matchedEntries = []
      for (var i = 0; i < entries.length; i++) {
          var e = entries[i]
          if (e.charAt(0) !== '.' || dotOk) {
              var m
              if (negate && !prefix) {
                  m = !e.match(pn)
              } else {
                  m = e.match(pn)
              }
              if (m)
                  matchedEntries.push(e)
          }
      }
  
      //console.error('prd2', prefix, entries, remain[0]._glob, matchedEntries)
  
      var len = matchedEntries.length
      // If there are no matched entries, then nothing matches.
      if (len === 0)
          return cb()
  
      // if this is the last remaining pattern bit, then no need for
      // an additional stat *unless* the user has specified mark or
      // stat explicitly.  We know they exist, since readdir returned
      // them.
  
      if (remain.length === 1 && !this.mark && !this.stat) {
          if (!this.matches[index])
              this.matches[index] = Object.create(null)
  
          for (var i = 0; i < len; i++) {
              var e = matchedEntries[i]
              if (prefix) {
                  if (prefix !== '/')
                      e = prefix + '/' + e
                  else
                      e = prefix + e
              }
  
              if (e.charAt(0) === '/' && !this.nomount) {
                  e = path.join(this.root, e)
              }
              this._emitMatch(index, e)
          }
          // This was the last one, and no stats were needed
          return cb()
      }
  
      // now test all matched entries as stand-ins for that part
      // of the pattern.
      remain.shift()
      for (var i = 0; i < len; i++) {
          var e = matchedEntries[i]
          var newPattern
          if (prefix) {
              if (prefix !== '/')
                  e = prefix + '/' + e
              else
                  e = prefix + e
          }
          this._process([e].concat(remain), index, inGlobStar, cb)
      }
      cb()
  }
  
  Glob.prototype._emitMatch = function (index, e) {
      if (this.aborted)
          return
  
      if (this.matches[index][e])
          return
  
      if (isIgnored(this, e))
          return
  
      if (this.paused) {
          this._emitQueue.push([index, e])
          return
      }
  
      var abs = this._makeAbs(e)
  
      if (this.nodir) {
          var c = this.cache[abs]
          if (c === 'DIR' || Array.isArray(c))
              return
      }
  
      if (this.mark)
          e = this._mark(e)
  
      this.matches[index][e] = true
  
      var st = this.statCache[abs]
      if (st)
          this.emit('stat', e, st)
  
      this.emit('match', e)
  }
  
  Glob.prototype._readdirInGlobStar = function (abs, cb) {
      if (this.aborted)
          return
  
      // follow all symlinked directories forever
      // just proceed as if this is a non-globstar situation
      if (this.follow)
          return this._readdir(abs, false, cb)
  
      var lstatkey = 'lstat\0' + abs
      var self = this
      var lstatcb = inflight(lstatkey, lstatcb_)
  
      if (lstatcb)
          fs.lstat(abs, lstatcb)
  
      function lstatcb_(er, lstat) {
          if (er)
              return cb()
  
          var isSym = lstat.isSymbolicLink()
          self.symlinks[abs] = isSym
  
          // If it's not a symlink or a dir, then it's definitely a regular file.
          // don't bother doing a readdir in that case.
          if (!isSym && !lstat.isDirectory()) {
              self.cache[abs] = 'FILE'
              cb()
          } else
              self._readdir(abs, false, cb)
      }
  }
  
  Glob.prototype._readdir = function (abs, inGlobStar, cb) {
      if (this.aborted)
          return
  
      cb = inflight('readdir\0' + abs + '\0' + inGlobStar, cb)
      if (!cb)
          return
  
      //console.error('RD %j %j', +inGlobStar, abs)
      if (inGlobStar && !ownProp(this.symlinks, abs))
          return this._readdirInGlobStar(abs, cb)
  
      if (ownProp(this.cache, abs)) {
          var c = this.cache[abs]
          if (!c || c === 'FILE')
              return cb()
  
          if (Array.isArray(c))
              return cb(null, c)
      }
  
      var self = this
      fs.readdir(abs, readdirCb(this, abs, cb))
  }
  
  function readdirCb(self, abs, cb) {
      return function (er, entries) {
          if (er)
              self._readdirError(abs, er, cb)
          else
              self._readdirEntries(abs, entries, cb)
      }
  }
  
  Glob.prototype._readdirEntries = function (abs, entries, cb) {
      if (this.aborted)
          return
  
      // if we haven't asked to stat everything, then just
      // assume that everything in there exists, so we can avoid
      // having to stat it a second time.
      if (!this.mark && !this.stat) {
          for (var i = 0; i < entries.length; i++) {
              var e = entries[i]
              if (abs === '/')
                  e = abs + e
              else
                  e = abs + '/' + e
              this.cache[e] = true
          }
      }
  
      this.cache[abs] = entries
      return cb(null, entries)
  }
  
  Glob.prototype._readdirError = function (f, er, cb) {
      if (this.aborted)
          return
  
      // handle errors, and cache the information
      switch (er.code) {
          case 'ENOTSUP': // https://github.com/isaacs/node-glob/issues/205
          case 'ENOTDIR': // totally normal. means it *does* exist.
              this.cache[this._makeAbs(f)] = 'FILE'
              break
  
          case 'ENOENT': // not terribly unusual
          case 'ELOOP':
          case 'ENAMETOOLONG':
          case 'UNKNOWN':
              this.cache[this._makeAbs(f)] = false
              break
  
          default: // some unusual error.  Treat as failure.
              this.cache[this._makeAbs(f)] = false
              if (this.strict) {
                  this.emit('error', er)
                  // If the error is handled, then we abort
                  // if not, we threw out of here
                  this.abort()
              }
              if (!this.silent)
                  console.error('glob error', er)
              break
      }
  
      return cb()
  }
  
  Glob.prototype._processGlobStar = function (prefix, read, abs, remain, index, inGlobStar, cb) {
      var self = this
      this._readdir(abs, inGlobStar, function (er, entries) {
          self._processGlobStar2(prefix, read, abs, remain, index, inGlobStar, entries, cb)
      })
  }
  
  
  Glob.prototype._processGlobStar2 = function (prefix, read, abs, remain, index, inGlobStar, entries, cb) {
      //console.error('pgs2', prefix, remain[0], entries)
  
      // no entries means not a dir, so it can never have matches
      // foo.txt/** doesn't match foo.txt
      if (!entries)
          return cb()
  
      // test without the globstar, and with every child both below
      // and replacing the globstar.
      var remainWithoutGlobStar = remain.slice(1)
      var gspref = prefix ? [prefix] : []
      var noGlobStar = gspref.concat(remainWithoutGlobStar)
  
      // the noGlobStar pattern exits the inGlobStar state
      this._process(noGlobStar, index, false, cb)
  
      var isSym = this.symlinks[abs]
      var len = entries.length
  
      // If it's a symlink, and we're in a globstar, then stop
      if (isSym && inGlobStar)
          return cb()
  
      for (var i = 0; i < len; i++) {
          var e = entries[i]
          if (e.charAt(0) === '.' && !this.dot)
              continue
  
          // these two cases enter the inGlobStar state
          var instead = gspref.concat(entries[i], remainWithoutGlobStar)
          this._process(instead, index, true, cb)
  
          var below = gspref.concat(entries[i], remain)
          this._process(below, index, true, cb)
      }
  
      cb()
  }
  
  Glob.prototype._processSimple = function (prefix, index, cb) {
      // XXX review this.  Shouldn't it be doing the mounting etc
      // before doing stat?  kinda weird?
      var self = this
      this._stat(prefix, function (er, exists) {
          self._processSimple2(prefix, index, er, exists, cb)
      })
  }
  Glob.prototype._processSimple2 = function (prefix, index, er, exists, cb) {
  
      //console.error('ps2', prefix, exists)
  
      if (!this.matches[index])
          this.matches[index] = Object.create(null)
  
      // If it doesn't exist, then just mark the lack of results
      if (!exists)
          return cb()
  
      if (prefix && isAbsolute(prefix) && !this.nomount) {
          var trail = /[\/\\]$/.test(prefix)
          if (prefix.charAt(0) === '/') {
              prefix = path.join(this.root, prefix)
          } else {
              prefix = path.resolve(this.root, prefix)
              if (trail)
                  prefix += '/'
          }
      }
  
      if (process.platform === 'win32')
          prefix = prefix.replace(/\\/g, '/')
  
      // Mark this as a match
      this._emitMatch(index, prefix)
      cb()
  }
  
  // Returns either 'DIR', 'FILE', or false
  Glob.prototype._stat = function (f, cb) {
      var abs = this._makeAbs(f)
      var needDir = f.slice(-1) === '/'
  
      if (f.length > this.maxLength)
          return cb()
  
      if (!this.stat && ownProp(this.cache, abs)) {
          var c = this.cache[abs]
  
          if (Array.isArray(c))
              c = 'DIR'
  
          // It exists, but maybe not how we need it
          if (!needDir || c === 'DIR')
              return cb(null, c)
  
          if (needDir && c === 'FILE')
              return cb()
  
          // otherwise we have to stat, because maybe c=true
          // if we know it exists, but not what it is.
      }
  
      var exists
      var stat = this.statCache[abs]
      if (stat !== undefined) {
          if (stat === false)
              return cb(null, stat)
          else {
              var type = stat.isDirectory() ? 'DIR' : 'FILE'
              if (needDir && type === 'FILE')
                  return cb()
              else
                  return cb(null, type, stat)
          }
      }
  
      var self = this
      var statcb = inflight('stat\0' + abs, lstatcb_)
      if (statcb)
          fs.lstat(abs, statcb)
  
      function lstatcb_(er, lstat) {
          if (lstat && lstat.isSymbolicLink()) {
              // If it's a symlink, then treat it as the target, unless
              // the target does not exist, then treat it as a file.
              return fs.stat(abs, function (er, stat) {
                  if (er)
                      self._stat2(f, abs, null, lstat, cb)
                  else
                      self._stat2(f, abs, er, stat, cb)
              })
          } else {
              self._stat2(f, abs, er, lstat, cb)
          }
      }
  }
  
  Glob.prototype._stat2 = function (f, abs, er, stat, cb) {
      if (er) {
          this.statCache[abs] = false
          return cb()
      }
  
      var needDir = f.slice(-1) === '/'
      this.statCache[abs] = stat
  
      if (abs.slice(-1) === '/' && !stat.isDirectory())
          return cb(null, false, stat)
  
      var c = stat.isDirectory() ? 'DIR' : 'FILE'
      this.cache[abs] = this.cache[abs] || c
  
      if (needDir && c !== 'DIR')
          return cb()
  
      return cb(null, c, stat)
  }
  