# all files / lib/ reader.js

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46.88% Branches 45/96
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     module.exports = Reader

    var fs = require('graceful-fs')
    var Stream = require('stream').Stream
    var inherits = require('inherits')
    var path = require('path')
    var getType = require('./get-type.js')
    var hardLinks = Reader.hardLinks = {}
    var Abstract = require('./abstract.js')

    // Must do this *before* loading the child classes
    inherits(Reader, Abstract)

    var LinkReader = require('./link-reader.js')

    function Reader (props, currentStat) {
      var self = this
      if (!(self instanceof Reader)) return new Reader(props, currentStat)

      if (typeof props === 'string') {
        props = { path: props }
      }

      if (!props) {
        self.error('Must provide properties or a path', null, true)
      } else if (!props.path) {
        self.error('Must provide a path', null, true)
      }

      // polymorphism.
      // call fstream.Reader(dir) to get a DirReader object, etc.
      // Note that, unlike in the Writer case, ProxyReader is going
      // to be the *normal* state of affairs, since we rarely know
      // the type of a file prior to reading it.

      var type = getType(props)
      var ClassType = Reader

      if (currentStat && !type) {
        type = getType(currentStat)
        props[type] = true
        props.type = type
      }

      switch (type) {
        case 'Directory':
          ClassType = require('./dir-reader.js')
          break

        case 'Link':
        // XXX hard links are just files.
        // However, it would be good to keep track of files' dev+inode
        // and nlink values, and create a HardLinkReader that emits
        // a linkpath value of the original copy, so that the tar
        // writer can preserve them.
        // ClassType = HardLinkReader
        // break

        case 'File':
          ClassType = require('./file-reader.js')
          break

        case 'SymbolicLink':
          ClassType = LinkReader
          break

        case 'Socket':
          ClassType = require('./socket-reader.js')
          break

        case null:
          ClassType = require('./proxy-reader.js')
          break
      }

      if (!(self instanceof ClassType)) {
        return new ClassType(props)
      }

      Abstract.call(self)

      self.readable = true
      self.writable = false

      self.type = type
      self.props = props
      self.depth = props.depth = props.depth || 0
      self.parent = props.parent || null
      self.root = props.root || (props.parent && props.parent.root) || self

      self._path = self.path = path.resolve(props.path)
      Iif (process.platform === 'win32') {
        self.path = self._path = self.path.replace(/\?/g, '_')
        if (self._path.length >= 260) {
          // how DOES one create files on the moon?
          // if the path has spaces in it, then UNC will fail.
          self._swallowErrors = true
          // if (self._path.indexOf(" ") === -1) {
          self._path = '\\\\?\\' + self.path.replace(/\//g, '\\')
        // }
        }
      }
      self.basename = props.basename = path.basename(self.path)
      self.dirname = props.dirname = path.dirname(self.path)

      // these have served their purpose, and are now just noisy clutter
      props.parent = props.root = null

      // console.error("\n\n\n%s setting size to", props.path, props.size)
      self.size = props.size
      self.filter = typeof props.filter === 'function' ? props.filter : null
      Iif (props.sort === 'alpha') props.sort = alphasort

      // start the ball rolling.
      // this will stat the thing, and then call self._read()
      // to start reading whatever it is.
      // console.error("calling stat", props.path, currentStat)
      self._stat(currentStat)
    }

    function alphasort (a, b) {
      return a === b ? 0
        : a.toLowerCase() > b.toLowerCase() ? 1
          : a.toLowerCase() < b.toLowerCase() ? -1
            : a > b ? 1
              : -1
    }

    Reader.prototype._stat = function (currentStat) {
      var self = this
      var props = self.props
      var stat = props.follow ? 'stat' : 'lstat'
      // console.error("Reader._stat", self._path, currentStat)
      Iif (currentStat) process.nextTick(statCb.bind(null, null, currentStat))
      else fs[stat](self._path, statCb)

      function statCb (er, props_) {
        // console.error("Reader._stat, statCb", self._path, props_, props_.nlink)
        Iif (er) return self.error(er)

        Object.keys(props_).forEach(function (k) {
          props[k] = props_[k]
        })

        // if it's not the expected size, then abort here.
        Iif (undefined !== self.size && props.size !== self.size) {
          return self.error('incorrect size')
        }
        self.size = props.size

        var type = getType(props)
        var handleHardlinks = props.hardlinks !== false

        // special little thing for handling hardlinks.
        Iif (handleHardlinks && type !== 'Directory' && props.nlink && props.nlink > 1) {
          var k = props.dev + ':' + props.ino
          // console.error("Reader has nlink", self._path, k)
          if (hardLinks[k] === self._path || !hardLinks[k]) {
            hardLinks[k] = self._path
          } else {
            // switch into hardlink mode.
            type = self.type = self.props.type = 'Link'
            self.Link = self.props.Link = true
            self.linkpath = self.props.linkpath = hardLinks[k]
            // console.error("Hardlink detected, switching mode", self._path, self.linkpath)
            // Setting __proto__ would arguably be the "correct"
            // approach here, but that just seems too wrong.
            self._stat = self._read = LinkReader.prototype._read
          }
        }

        Iif (self.type && self.type !== type) {
          self.error('Unexpected type: ' + type)
        }

        // if the filter doesn't pass, then just skip over this one.
        // still have to emit end so that dir-walking can move on.
        Iif (self.filter) {
          var who = self._proxy || self
          // special handling for ProxyReaders
          if (!self.filter.call(who, who, props)) {
            if (!self._disowned) {
              self.abort()
              self.emit('end')
              self.emit('close')
            }
            return
          }
        }

        // last chance to abort or disown before the flow starts!
        var events = ['_stat', 'stat', 'ready']
        var e = 0
        ;(function go () {
          Iif (self._aborted) {
            self.emit('end')
            self.emit('close')
            return
          }

          Iif (self._paused && self.type !== 'Directory') {
            self.once('resume', go)
            return
          }

          var ev = events[e++]
          if (!ev) {
            return self._read()
          }
          self.emit(ev, props)
          go()
        })()
      }
    }

    Reader.prototype.pipe = function (dest) {
      var self = this
      if (typeof dest.add === 'function') {
        // piping to a multi-compatible, and we've got directory entries.
        self.on('entry', function (entry) {
          var ret = dest.add(entry)
          if (ret === false) {
            self.pause()
          }
        })
      }

      // console.error("R Pipe apply Stream Pipe")
      return Stream.prototype.pipe.apply(this, arguments)
    }

    Reader.prototype.pause = function (who) {
      this._paused = true
      who = who || this
      this.emit('pause', who)
      if (this._stream) this._stream.pause(who)
    }

    Reader.prototype.resume = function (who) {
      this._paused = false
      who = who || this
      this.emit('resume', who)
      if (this._stream) this._stream.resume(who)
      this._read()
    }

    Reader.prototype._read = function () {
      this.error('Cannot read unknown type: ' + this.type)
    }