diff options
Diffstat (limited to 'deps/npm/node_modules/node-gyp/node_modules/fstream/lib/dir-reader.js')
| -rw-r--r-- | deps/npm/node_modules/node-gyp/node_modules/fstream/lib/dir-reader.js | 252 |
1 files changed, 252 insertions, 0 deletions
diff --git a/deps/npm/node_modules/node-gyp/node_modules/fstream/lib/dir-reader.js b/deps/npm/node_modules/node-gyp/node_modules/fstream/lib/dir-reader.js new file mode 100644 index 0000000000..820cdc85a8 --- /dev/null +++ b/deps/npm/node_modules/node-gyp/node_modules/fstream/lib/dir-reader.js @@ -0,0 +1,252 @@ +// A thing that emits "entry" events with Reader objects +// Pausing it causes it to stop emitting entry events, and also +// pauses the current entry if there is one. + +module.exports = DirReader + +var fs = require('graceful-fs') +var inherits = require('inherits') +var path = require('path') +var Reader = require('./reader.js') +var assert = require('assert').ok + +inherits(DirReader, Reader) + +function DirReader (props) { + var self = this + if (!(self instanceof DirReader)) { + throw new Error('DirReader must be called as constructor.') + } + + // should already be established as a Directory type + if (props.type !== 'Directory' || !props.Directory) { + throw new Error('Non-directory type ' + props.type) + } + + self.entries = null + self._index = -1 + self._paused = false + self._length = -1 + + if (props.sort) { + this.sort = props.sort + } + + Reader.call(this, props) +} + +DirReader.prototype._getEntries = function () { + var self = this + + // race condition. might pause() before calling _getEntries, + // and then resume, and try to get them a second time. + if (self._gotEntries) return + self._gotEntries = true + + fs.readdir(self._path, function (er, entries) { + if (er) return self.error(er) + + self.entries = entries + + self.emit('entries', entries) + if (self._paused) self.once('resume', processEntries) + else processEntries() + + function processEntries () { + self._length = self.entries.length + if (typeof self.sort === 'function') { + self.entries = self.entries.sort(self.sort.bind(self)) + } + self._read() + } + }) +} + +// start walking the dir, and emit an "entry" event for each one. +DirReader.prototype._read = function () { + var self = this + + if (!self.entries) return self._getEntries() + + if (self._paused || self._currentEntry || self._aborted) { + // console.error('DR paused=%j, current=%j, aborted=%j', self._paused, !!self._currentEntry, self._aborted) + return + } + + self._index++ + if (self._index >= self.entries.length) { + if (!self._ended) { + self._ended = true + self.emit('end') + self.emit('close') + } + return + } + + // ok, handle this one, then. + + // save creating a proxy, by stat'ing the thing now. + var p = path.resolve(self._path, self.entries[self._index]) + assert(p !== self._path) + assert(self.entries[self._index]) + + // set this to prevent trying to _read() again in the stat time. + self._currentEntry = p + fs[ self.props.follow ? 'stat' : 'lstat' ](p, function (er, stat) { + if (er) return self.error(er) + + var who = self._proxy || self + + stat.path = p + stat.basename = path.basename(p) + stat.dirname = path.dirname(p) + var childProps = self.getChildProps.call(who, stat) + childProps.path = p + childProps.basename = path.basename(p) + childProps.dirname = path.dirname(p) + + var entry = Reader(childProps, stat) + + // console.error("DR Entry", p, stat.size) + + self._currentEntry = entry + + // "entry" events are for direct entries in a specific dir. + // "child" events are for any and all children at all levels. + // This nomenclature is not completely final. + + entry.on('pause', function (who) { + if (!self._paused && !entry._disowned) { + self.pause(who) + } + }) + + entry.on('resume', function (who) { + if (self._paused && !entry._disowned) { + self.resume(who) + } + }) + + entry.on('stat', function (props) { + self.emit('_entryStat', entry, props) + if (entry._aborted) return + if (entry._paused) { + entry.once('resume', function () { + self.emit('entryStat', entry, props) + }) + } else self.emit('entryStat', entry, props) + }) + + entry.on('ready', function EMITCHILD () { + // console.error("DR emit child", entry._path) + if (self._paused) { + // console.error(" DR emit child - try again later") + // pause the child, and emit the "entry" event once we drain. + // console.error("DR pausing child entry") + entry.pause(self) + return self.once('resume', EMITCHILD) + } + + // skip over sockets. they can't be piped around properly, + // so there's really no sense even acknowledging them. + // if someone really wants to see them, they can listen to + // the "socket" events. + if (entry.type === 'Socket') { + self.emit('socket', entry) + } else { + self.emitEntry(entry) + } + }) + + var ended = false + entry.on('close', onend) + entry.on('disown', onend) + function onend () { + if (ended) return + ended = true + self.emit('childEnd', entry) + self.emit('entryEnd', entry) + self._currentEntry = null + if (!self._paused) { + self._read() + } + } + + // XXX Remove this. Works in node as of 0.6.2 or so. + // Long filenames should not break stuff. + entry.on('error', function (er) { + if (entry._swallowErrors) { + self.warn(er) + entry.emit('end') + entry.emit('close') + } else { + self.emit('error', er) + } + }) + + // proxy up some events. + ;[ + 'child', + 'childEnd', + 'warn' + ].forEach(function (ev) { + entry.on(ev, self.emit.bind(self, ev)) + }) + }) +} + +DirReader.prototype.disown = function (entry) { + entry.emit('beforeDisown') + entry._disowned = true + entry.parent = entry.root = null + if (entry === this._currentEntry) { + this._currentEntry = null + } + entry.emit('disown') +} + +DirReader.prototype.getChildProps = function () { + return { + depth: this.depth + 1, + root: this.root || this, + parent: this, + follow: this.follow, + filter: this.filter, + sort: this.props.sort, + hardlinks: this.props.hardlinks + } +} + +DirReader.prototype.pause = function (who) { + var self = this + if (self._paused) return + who = who || self + self._paused = true + if (self._currentEntry && self._currentEntry.pause) { + self._currentEntry.pause(who) + } + self.emit('pause', who) +} + +DirReader.prototype.resume = function (who) { + var self = this + if (!self._paused) return + who = who || self + + self._paused = false + // console.error('DR Emit Resume', self._path) + self.emit('resume', who) + if (self._paused) { + // console.error('DR Re-paused', self._path) + return + } + + if (self._currentEntry) { + if (self._currentEntry.resume) self._currentEntry.resume(who) + } else self._read() +} + +DirReader.prototype.emitEntry = function (entry) { + this.emit('entry', entry) + this.emit('child', entry) +} |