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bufferFrom = require('buffer-from')\nvar Transform = require('readable-stream').Transform;\nvar inherits = require('inherits');\n\ninherits(Tokenize, Transform);\nmodule.exports = Tokenize;\n\nvar codes = {\n    lt: '<'.charCodeAt(0),\n    gt: '>'.charCodeAt(0),\n    slash: '/'.charCodeAt(0),\n    dquote: '\"'.charCodeAt(0),\n    squote: \"'\".charCodeAt(0),\n    equal: '='.charCodeAt(0)\n};\n\nvar strings = {\n    endScript: bufferFrom('</script'),\n    endStyle: bufferFrom('</style'),\n    endTitle: bufferFrom('</title'),\n    comment: bufferFrom('<!--'),\n    endComment: bufferFrom('-->'),\n    cdata: bufferFrom('<![CDATA['),\n    endCdata: bufferFrom(']]>')\n};\n\nvar states = {\n    'TagNameState': 1,\n    'AttributeNameState': 2,\n    'BeforeAttributeValueState': 3,\n    'AttributeValueState':4\n}\n\nfunction Tokenize () {\n    if (!(this instanceof Tokenize)) return new Tokenize;\n    Transform.call(this);\n    this._readableState.objectMode = true;\n    this.state = 'text';\n    this.tagState = null;\n    this.quoteState = null;\n    this.raw = null;\n    this.buffers = [];\n    this._last = [];\n}\n\nTokenize.prototype._transform = function (buf, enc, next) {\n    var i = 0;\n    var offset = 0;\n    \n    if (this._prev) {\n        buf = Buffer.concat([ this._prev, buf ]);\n        i = this._prev.length - 1;\n        offset = this._offset;\n        this._prev = null;\n        this._offset = 0;\n    }\n    \n    for (; i < buf.length; i++) {\n        var b = buf[i];\n        this._last.push(b);\n        if (this._last.length > 9) this._last.shift();\n        // detect end of raw character mode (comment, script,..)\n        if (this.raw) {\n            var parts = this._testRaw(buf, offset, i);\n            if (parts) {\n                this.push([ 'text', parts[0] ]);\n                \n                if (this.raw === strings.endComment\n                || this.raw === strings.endCdata) {\n                    this.state = 'text';\n                    this.buffers = [];\n                    this.push([ 'close', parts[1] ]);\n                }\n                else {\n                    this.state = 'open';\n                    this.buffers = [ parts[1] ];\n                }\n                \n                this.raw = null;\n                offset = i + 1;\n            }\n        }\n        // ask for more data if last byte is '<' \n        else if (this.state === 'text' && b === codes.lt\n        && i === buf.length - 1) {\n            this._prev = buf;\n            this._offset = offset;\n            return next();\n        }\n        // detect a tag opening\n        else if (this.state === 'text' && b === codes.lt\n        && !isWhiteSpace(buf[i+1])) {\n            if (i > 0 && i - offset > 0) {\n                this.buffers.push(buf.slice(offset, i));\n            }\n            offset = i;\n            this.state = 'open';\n            this.tagState = states.TagNameState;\n            this._pushState('text');\n        }\n        else if (\n            this.tagState === states.TagNameState &&\n            isWhiteSpace(b)\n        ) {\n            this.tagState = states.AttributeNameState\n        }\n        else if (\n            this.tagState === states.AttributeNameState &&\n            b === codes.equal\n        ) {\n            this.tagState = states.BeforeAttributeValueState\n        }\n        else if (\n            this.tagState === states.BeforeAttributeValueState &&\n            isWhiteSpace(b)\n        ) {}\n        else if (\n            this.tagState === states.BeforeAttributeValueState\n            && b !== codes.gt\n        ) {\n            this.tagState = states.AttributeValueState;\n            if (b === codes.dquote) {\n                this.quoteState = 'double';\n            } else if (b === codes.squote) {\n                this.quoteState = 'single';\n            } else {\n                this.quoteState = null;\n            }\n        }\n        else if (\n            this.tagState === states.AttributeValueState &&\n            !this.quoteState &&\n            isWhiteSpace(b)\n        ) {\n            this.tagState = states.AttributeNameState;\n        }\n        else if (\n            this.tagState === states.AttributeValueState &&\n            this.quoteState === 'double' &&\n            b === codes.dquote\n        ) {\n            this.quoteState = null;\n            this.tagState = states.AttributeNameState;\n        }\n        else if (\n            this.tagState === states.AttributeValueState &&\n            this.quoteState === 'single' &&\n            b === codes.squote\n        ) {\n            this.quoteState = null;\n            this.tagState = states.AttributeNameState;\n        }\n        else if (this.state === 'open' && b === codes.gt && !this.quoteState) {\n            this.buffers.push(buf.slice(offset, i + 1));\n            offset = i + 1;\n            this.state = 'text';\n            this.tagState = null;\n            if (this._getChar(1) === codes.slash) {\n                this._pushState('close');\n            }\n            else {\n                var tag = this._getTag();\n                if (tag === 'script') this.raw = strings.endScript;\n                if (tag === 'style') this.raw = strings.endStyle;\n                if (tag === 'title') this.raw = strings.endTitle;\n                this._pushState('open');\n            }\n        }\n        else if (this.state === 'open' && compare(this._last, strings.comment)) {\n            this.buffers.push(buf.slice(offset, i + 1));\n            offset = i + 1;\n            this.state = 'text';\n            this.raw = strings.endComment;\n            this._pushState('open');\n        }\n        else if (this.state === 'open' && compare(this._last, strings.cdata)) {\n            this.buffers.push(buf.slice(offset, i + 1));\n            offset = i + 1;\n            this.state = 'text';\n            this.raw = strings.endCdata;\n            this._pushState('open');\n        }\n    }\n    if (offset < buf.length) this.buffers.push(buf.slice(offset));\n    next();\n};\n\nTokenize.prototype._flush = function (next) {\n    if (this.state === 'text') this._pushState('text');\n    this.push(null);\n    next();\n};\n\nTokenize.prototype._pushState = function (ev) {\n    if (this.buffers.length === 0) return;\n    var buf = Buffer.concat(this.buffers);\n    this.buffers = [];\n    this.push([ ev, buf ]);\n};\n\nTokenize.prototype._getChar = function (i) {\n    var offset = 0;\n    for (var j = 0; j < this.buffers.length; j++) {\n        var buf = this.buffers[j];\n        if (offset + buf.length > i) {\n            return buf[i - offset];\n        }\n        offset += buf;\n    }\n};\n\nTokenize.prototype._getTag = function () {\n    var offset = 0;\n    var tag = '';\n    for (var j = 0; j < this.buffers.length; j++) {\n        var buf = this.buffers[j];\n        for (var k = 0; k < buf.length; k++) {\n            if (offset === 0 && k === 0) continue;\n            var c = String.fromCharCode(buf[k]);\n            if (/[^\\w-!\\[\\]]/.test(c)) {\n                return tag.toLowerCase();\n            }\n            else tag += c;\n        }\n        offset += buf.length;\n    }\n};\n\nTokenize.prototype._testRaw = function (buf, offset, index) {\n    var raw = this.raw, last = this._last;\n    if (!compare(last, raw)) return;\n    \n    this.buffers.push(buf.slice(offset, index + 1));\n    var buf = Buffer.concat(this.buffers);\n    var k = buf.length - raw.length;\n    return [ buf.slice(0, k), buf.slice(k) ];\n};\n\nfunction compare (a, b) {\n    if (a.length < b.length) return false;\n    for (var i=a.length-1, j=b.length-1; i >= 0 && j >= 0; i--, j--) {\n        if (lower(a[i]) !== lower(b[j])) return false;\n    }\n    return true;\n}\n\nfunction lower (n) {\n    if (n >= 65 && n <= 90) return n + 32;\n    return n;\n}\n\nfunction isWhiteSpace(b) {\n  return b === 0x20 || b === 0x09 || b === 0x0A || b === 0x0C || b === 0x0D;\n}\n","var toString = Object.prototype.toString\n\nvar isModern = (\n  typeof Buffer.alloc === 'function' &&\n  typeof Buffer.allocUnsafe === 'function' &&\n  typeof Buffer.from === 'function'\n)\n\nfunction isArrayBuffer (input) {\n  return toString.call(input).slice(8, -1) === 'ArrayBuffer'\n}\n\nfunction fromArrayBuffer (obj, byteOffset, length) {\n  byteOffset >>>= 0\n\n  var maxLength = obj.byteLength - byteOffset\n\n  if (maxLength < 0) {\n    throw new RangeError(\"'offset' is out of bounds\")\n  }\n\n  if (length === undefined) {\n    length = maxLength\n  } else {\n    length >>>= 0\n\n    if (length > maxLength) {\n      throw new RangeError(\"'length' is out of bounds\")\n    }\n  }\n\n  return isModern\n    ? Buffer.from(obj.slice(byteOffset, byteOffset + length))\n    : new Buffer(new Uint8Array(obj.slice(byteOffset, byteOffset + length)))\n}\n\nfunction fromString (string, encoding) {\n  if (typeof encoding !== 'string' || encoding === '') {\n    encoding = 'utf8'\n  }\n\n  if (!Buffer.isEncoding(encoding)) {\n    throw new TypeError('\"encoding\" must be a valid string encoding')\n  }\n\n  return isModern\n    ? Buffer.from(string, encoding)\n    : new Buffer(string, encoding)\n}\n\nfunction bufferFrom (value, encodingOrOffset, length) {\n  if (typeof value === 'number') {\n    throw new TypeError('\"value\" argument must not be a number')\n  }\n\n  if (isArrayBuffer(value)) {\n    return fromArrayBuffer(value, encodingOrOffset, length)\n  }\n\n  if (typeof value === 'string') {\n    return fromString(value, encodingOrOffset)\n  }\n\n  return isModern\n    ? Buffer.from(value)\n    : new Buffer(value)\n}\n\nmodule.exports = bufferFrom\n","module.exports = Array.isArray || function (arr) {\n  return Object.prototype.toString.call(arr) == '[object Array]';\n};\n","// Copyright Joyent, Inc. and other Node contributors.\n//\n// Permission is hereby granted, free of charge, to any person obtaining a\n// copy of this software and associated documentation files (the\n// \"Software\"), to deal in the Software without restriction, including\n// without limitation the rights to use, copy, modify, merge, publish,\n// distribute, sublicense, and/or sell copies of the Software, and to permit\n// persons to whom the Software is furnished to do so, subject to the\n// following conditions:\n//\n// The above copyright notice and this permission notice shall be included\n// in all copies or substantial portions of the Software.\n//\n// THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS\n// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF\n// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN\n// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,\n// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR\n// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE\n// USE OR OTHER DEALINGS IN THE SOFTWARE.\n\n// a duplex stream is just a stream that is both readable and writable.\n// Since JS doesn't have multiple prototypal inheritance, this class\n// prototypally inherits from Readable, and then parasitically from\n// Writable.\n\nmodule.exports = Duplex;\n\n/*<replacement>*/\nvar objectKeys = Object.keys || function (obj) {\n  var keys = [];\n  for (var key in obj) keys.push(key);\n  return keys;\n}\n/*</replacement>*/\n\n\n/*<replacement>*/\nvar util = require('core-util-is');\nutil.inherits = require('inherits');\n/*</replacement>*/\n\nvar Readable = require('./_stream_readable');\nvar Writable = require('./_stream_writable');\n\nutil.inherits(Duplex, Readable);\n\nforEach(objectKeys(Writable.prototype), function(method) {\n  if (!Duplex.prototype[method])\n    Duplex.prototype[method] = Writable.prototype[method];\n});\n\nfunction Duplex(options) {\n  if (!(this instanceof Duplex))\n    return new Duplex(options);\n\n  Readable.call(this, options);\n  Writable.call(this, options);\n\n  if (options && options.readable === false)\n    this.readable = false;\n\n  if (options && options.writable === false)\n    this.writable = false;\n\n  this.allowHalfOpen = true;\n  if (options && options.allowHalfOpen === false)\n    this.allowHalfOpen = false;\n\n  this.once('end', onend);\n}\n\n// the no-half-open enforcer\nfunction onend() {\n  // if we allow half-open state, or if the writable side ended,\n  // then we're ok.\n  if (this.allowHalfOpen || this._writableState.ended)\n    return;\n\n  // no more data can be written.\n  // But allow more writes to happen in this tick.\n  process.nextTick(this.end.bind(this));\n}\n\nfunction forEach (xs, f) {\n  for (var i = 0, l = xs.length; i < l; i++) {\n    f(xs[i], i);\n  }\n}\n","// Copyright Joyent, Inc. and other Node contributors.\n//\n// Permission is hereby granted, free of charge, to any person obtaining a\n// copy of this software and associated documentation files (the\n// \"Software\"), to deal in the Software without restriction, including\n// without limitation the rights to use, copy, modify, merge, publish,\n// distribute, sublicense, and/or sell copies of the Software, and to permit\n// persons to whom the Software is furnished to do so, subject to the\n// following conditions:\n//\n// The above copyright notice and this permission notice shall be included\n// in all copies or substantial portions of the Software.\n//\n// THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS\n// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF\n// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN\n// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,\n// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR\n// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE\n// USE OR OTHER DEALINGS IN THE SOFTWARE.\n\n// a passthrough stream.\n// basically just the most minimal sort of Transform stream.\n// Every written chunk gets output as-is.\n\nmodule.exports = PassThrough;\n\nvar Transform = require('./_stream_transform');\n\n/*<replacement>*/\nvar util = require('core-util-is');\nutil.inherits = require('inherits');\n/*</replacement>*/\n\nutil.inherits(PassThrough, Transform);\n\nfunction PassThrough(options) {\n  if (!(this instanceof PassThrough))\n    return new PassThrough(options);\n\n  Transform.call(this, options);\n}\n\nPassThrough.prototype._transform = function(chunk, encoding, cb) {\n  cb(null, chunk);\n};\n","// Copyright Joyent, Inc. and other Node contributors.\n//\n// Permission is hereby granted, free of charge, to any person obtaining a\n// copy of this software and associated documentation files (the\n// \"Software\"), to deal in the Software without restriction, including\n// without limitation the rights to use, copy, modify, merge, publish,\n// distribute, sublicense, and/or sell copies of the Software, and to permit\n// persons to whom the Software is furnished to do so, subject to the\n// following conditions:\n//\n// The above copyright notice and this permission notice shall be included\n// in all copies or substantial portions of the Software.\n//\n// THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS\n// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF\n// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN\n// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,\n// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR\n// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE\n// USE OR OTHER DEALINGS IN THE SOFTWARE.\n\nmodule.exports = Readable;\n\n/*<replacement>*/\nvar isArray = require('isarray');\n/*</replacement>*/\n\n\n/*<replacement>*/\nvar Buffer = require('buffer').Buffer;\n/*</replacement>*/\n\nReadable.ReadableState = ReadableState;\n\nvar EE = require('events').EventEmitter;\n\n/*<replacement>*/\nif (!EE.listenerCount) EE.listenerCount = function(emitter, type) {\n  return emitter.listeners(type).length;\n};\n/*</replacement>*/\n\nvar Stream = require('stream');\n\n/*<replacement>*/\nvar util = require('core-util-is');\nutil.inherits = require('inherits');\n/*</replacement>*/\n\nvar StringDecoder;\n\nutil.inherits(Readable, Stream);\n\nfunction ReadableState(options, stream) {\n  options = options || {};\n\n  // the point at which it stops calling _read() to fill the buffer\n  // Note: 0 is a valid value, means \"don't call _read preemptively ever\"\n  var hwm = options.highWaterMark;\n  this.highWaterMark = (hwm || hwm === 0) ? hwm : 16 * 1024;\n\n  // cast to ints.\n  this.highWaterMark = ~~this.highWaterMark;\n\n  this.buffer = [];\n  this.length = 0;\n  this.pipes = null;\n  this.pipesCount = 0;\n  this.flowing = false;\n  this.ended = false;\n  this.endEmitted = false;\n  this.reading = false;\n\n  // In streams that never have any data, and do push(null) right away,\n  // the consumer can miss the 'end' event if they do some I/O before\n  // consuming the stream.  So, we don't emit('end') until some reading\n  // happens.\n  this.calledRead = false;\n\n  // a flag to be able to tell if the onwrite cb is called immediately,\n  // or on a later tick.  We set this to true at first, becuase any\n  // actions that shouldn't happen until \"later\" should generally also\n  // not happen before the first write call.\n  this.sync = true;\n\n  // whenever we return null, then we set a flag to say\n  // that we're awaiting a 'readable' event emission.\n  this.needReadable = false;\n  this.emittedReadable = false;\n  this.readableListening = false;\n\n\n  // object stream flag. Used to make read(n) ignore n and to\n  // make all the buffer merging and length checks go away\n  this.objectMode = !!options.objectMode;\n\n  // Crypto is kind of old and crusty.  Historically, its default string\n  // encoding is 'binary' so we have to make this configurable.\n  // Everything else in the universe uses 'utf8', though.\n  this.defaultEncoding = options.defaultEncoding || 'utf8';\n\n  // when piping, we only care about 'readable' events that happen\n  // after read()ing all the bytes and not getting any pushback.\n  this.ranOut = false;\n\n  // the number of writers that are awaiting a drain event in .pipe()s\n  this.awaitDrain = 0;\n\n  // if true, a maybeReadMore has been scheduled\n  this.readingMore = false;\n\n  this.decoder = null;\n  this.encoding = null;\n  if (options.encoding) {\n    if (!StringDecoder)\n      StringDecoder = require('string_decoder/').StringDecoder;\n    this.decoder = new StringDecoder(options.encoding);\n    this.encoding = options.encoding;\n  }\n}\n\nfunction Readable(options) {\n  if (!(this instanceof Readable))\n    return new Readable(options);\n\n  this._readableState = new ReadableState(options, this);\n\n  // legacy\n  this.readable = true;\n\n  Stream.call(this);\n}\n\n// Manually shove something into the read() buffer.\n// This returns true if the highWaterMark has not been hit yet,\n// similar to how Writable.write() returns true if you should\n// write() some more.\nReadable.prototype.push = function(chunk, encoding) {\n  var state = this._readableState;\n\n  if (typeof chunk === 'string' && !state.objectMode) {\n    encoding = encoding || state.defaultEncoding;\n    if (encoding !== state.encoding) {\n      chunk = new Buffer(chunk, encoding);\n      encoding = '';\n    }\n  }\n\n  return readableAddChunk(this, state, chunk, encoding, false);\n};\n\n// Unshift should *always* be something directly out of read()\nReadable.prototype.unshift = function(chunk) {\n  var state = this._readableState;\n  return readableAddChunk(this, state, chunk, '', true);\n};\n\nfunction readableAddChunk(stream, state, chunk, encoding, addToFront) {\n  var er = chunkInvalid(state, chunk);\n  if (er) {\n    stream.emit('error', er);\n  } else if (chunk === null || chunk === undefined) {\n    state.reading = false;\n    if (!state.ended)\n      onEofChunk(stream, state);\n  } else if (state.objectMode || chunk && chunk.length > 0) {\n    if (state.ended && !addToFront) {\n      var e = new Error('stream.push() after EOF');\n      stream.emit('error', e);\n    } else if (state.endEmitted && addToFront) {\n      var e = new Error('stream.unshift() after end event');\n      stream.emit('error', e);\n    } else {\n      if (state.decoder && !addToFront && !encoding)\n        chunk = state.decoder.write(chunk);\n\n      // update the buffer info.\n      state.length += state.objectMode ? 1 : chunk.length;\n      if (addToFront) {\n        state.buffer.unshift(chunk);\n      } else {\n        state.reading = false;\n        state.buffer.push(chunk);\n      }\n\n      if (state.needReadable)\n        emitReadable(stream);\n\n      maybeReadMore(stream, state);\n    }\n  } else if (!addToFront) {\n    state.reading = false;\n  }\n\n  return needMoreData(state);\n}\n\n\n\n// if it's past the high water mark, we can push in some more.\n// Also, if we have no data yet, we can stand some\n// more bytes.  This is to work around cases where hwm=0,\n// such as the repl.  Also, if the push() triggered a\n// readable event, and the user called read(largeNumber) such that\n// needReadable was set, then we ought to push more, so that another\n// 'readable' event will be triggered.\nfunction needMoreData(state) {\n  return !state.ended &&\n         (state.needReadable ||\n          state.length < state.highWaterMark ||\n          state.length === 0);\n}\n\n// backwards compatibility.\nReadable.prototype.setEncoding = function(enc) {\n  if (!StringDecoder)\n    StringDecoder = require('string_decoder/').StringDecoder;\n  this._readableState.decoder = new StringDecoder(enc);\n  this._readableState.encoding = enc;\n};\n\n// Don't raise the hwm > 128MB\nvar MAX_HWM = 0x800000;\nfunction roundUpToNextPowerOf2(n) {\n  if (n >= MAX_HWM) {\n    n = MAX_HWM;\n  } else {\n    // Get the next highest power of 2\n    n--;\n    for (var p = 1; p < 32; p <<= 1) n |= n >> p;\n    n++;\n  }\n  return n;\n}\n\nfunction howMuchToRead(n, state) {\n  if (state.length === 0 && state.ended)\n    return 0;\n\n  if (state.objectMode)\n    return n === 0 ? 0 : 1;\n\n  if (n === null || isNaN(n)) {\n    // only flow one buffer at a time\n    if (state.flowing && state.buffer.length)\n      return state.buffer[0].length;\n    else\n      return state.length;\n  }\n\n  if (n <= 0)\n    return 0;\n\n  // If we're asking for more than the target buffer level,\n  // then raise the water mark.  Bump up to the next highest\n  // power of 2, to prevent increasing it excessively in tiny\n  // amounts.\n  if (n > state.highWaterMark)\n    state.highWaterMark = roundUpToNextPowerOf2(n);\n\n  // don't have that much.  return null, unless we've ended.\n  if (n > state.length) {\n    if (!state.ended) {\n      state.needReadable = true;\n      return 0;\n    } else\n      return state.length;\n  }\n\n  return n;\n}\n\n// you can override either this method, or the async _read(n) below.\nReadable.prototype.read = function(n) {\n  var state = this._readableState;\n  state.calledRead = true;\n  var nOrig = n;\n  var ret;\n\n  if (typeof n !== 'number' || n > 0)\n    state.emittedReadable = false;\n\n  // if we're doing read(0) to trigger a readable event, but we\n  // already have a bunch of data in the buffer, then just trigger\n  // the 'readable' event and move on.\n  if (n === 0 &&\n      state.needReadable &&\n      (state.length >= state.highWaterMark || state.ended)) {\n    emitReadable(this);\n    return null;\n  }\n\n  n = howMuchToRead(n, state);\n\n  // if we've ended, and we're now clear, then finish it up.\n  if (n === 0 && state.ended) {\n    ret = null;\n\n    // In cases where the decoder did not receive enough data\n    // to produce a full chunk, then immediately received an\n    // EOF, state.buffer will contain [<Buffer >, <Buffer 00 ...>].\n    // howMuchToRead will see this and coerce the amount to\n    // read to zero (because it's looking at the length of the\n    // first <Buffer > in state.buffer), and we'll end up here.\n    //\n    // This can only happen via state.decoder -- no other venue\n    // exists for pushing a zero-length chunk into state.buffer\n    // and triggering this behavior. In this case, we return our\n    // remaining data and end the stream, if appropriate.\n    if (state.length > 0 && state.decoder) {\n      ret = fromList(n, state);\n      state.length -= ret.length;\n    }\n\n    if (state.length === 0)\n      endReadable(this);\n\n    return ret;\n  }\n\n  // All the actual chunk generation logic needs to be\n  // *below* the call to _read.  The reason is that in certain\n  // synthetic stream cases, such as passthrough streams, _read\n  // may be a completely synchronous operation which may change\n  // the state of the read buffer, providing enough data when\n  // before there was *not* enough.\n  //\n  // So, the steps are:\n  // 1. Figure out what the state of things will be after we do\n  // a read from the buffer.\n  //\n  // 2. If that resulting state will trigger a _read, then call _read.\n  // Note that this may be asynchronous, or synchronous.  Yes, it is\n  // deeply ugly to write APIs this way, but that still doesn't mean\n  // that the Readable class should behave improperly, as streams are\n  // designed to be sync/async agnostic.\n  // Take note if the _read call is sync or async (ie, if the read call\n  // has returned yet), so that we know whether or not it's safe to emit\n  // 'readable' etc.\n  //\n  // 3. Actually pull the requested chunks out of the buffer and return.\n\n  // if we need a readable event, then we need to do some reading.\n  var doRead = state.needReadable;\n\n  // if we currently have less than the highWaterMark, then also read some\n  if (state.length - n <= state.highWaterMark)\n    doRead = true;\n\n  // however, if we've ended, then there's no point, and if we're already\n  // reading, then it's unnecessary.\n  if (state.ended || state.reading)\n    doRead = false;\n\n  if (doRead) {\n    state.reading = true;\n    state.sync = true;\n    // if the length is currently zero, then we *need* a readable event.\n    if (state.length === 0)\n      state.needReadable = true;\n    // call internal read method\n    this._read(state.highWaterMark);\n    state.sync = false;\n  }\n\n  // If _read called its callback synchronously, then `reading`\n  // will be false, and we need to re-evaluate how much data we\n  // can return to the user.\n  if (doRead && !state.reading)\n    n = howMuchToRead(nOrig, state);\n\n  if (n > 0)\n    ret = fromList(n, state);\n  else\n    ret = null;\n\n  if (ret === null) {\n    state.needReadable = true;\n    n = 0;\n  }\n\n  state.length -= n;\n\n  // If we have nothing in the buffer, then we want to know\n  // as soon as we *do* get something into the buffer.\n  if (state.length === 0 && !state.ended)\n    state.needReadable = true;\n\n  // If we happened to read() exactly the remaining amount in the\n  // buffer, and the EOF has been seen at this point, then make sure\n  // that we emit 'end' on the very next tick.\n  if (state.ended && !state.endEmitted && state.length === 0)\n    endReadable(this);\n\n  return ret;\n};\n\nfunction chunkInvalid(state, chunk) {\n  var er = null;\n  if (!Buffer.isBuffer(chunk) &&\n      'string' !== typeof chunk &&\n      chunk !== null &&\n      chunk !== undefined &&\n      !state.objectMode) {\n    er = new TypeError('Invalid non-string/buffer chunk');\n  }\n  return er;\n}\n\n\nfunction onEofChunk(stream, state) {\n  if (state.decoder && !state.ended) {\n    var chunk = state.decoder.end();\n    if (chunk && chunk.length) {\n      state.buffer.push(chunk);\n      state.length += state.objectMode ? 1 : chunk.length;\n    }\n  }\n  state.ended = true;\n\n  // if we've ended and we have some data left, then emit\n  // 'readable' now to make sure it gets picked up.\n  if (state.length > 0)\n    emitReadable(stream);\n  else\n    endReadable(stream);\n}\n\n// Don't emit readable right away in sync mode, because this can trigger\n// another read() call => stack overflow.  This way, it might trigger\n// a nextTick recursion warning, but that's not so bad.\nfunction emitReadable(stream) {\n  var state = stream._readableState;\n  state.needReadable = false;\n  if (state.emittedReadable)\n    return;\n\n  state.emittedReadable = true;\n  if (state.sync)\n    process.nextTick(function() {\n      emitReadable_(stream);\n    });\n  else\n    emitReadable_(stream);\n}\n\nfunction emitReadable_(stream) {\n  stream.emit('readable');\n}\n\n\n// at this point, the user has presumably seen the 'readable' event,\n// and called read() to consume some data.  that may have triggered\n// in turn another _read(n) call, in which case reading = true if\n// it's in progress.\n// However, if we're not ended, or reading, and the length < hwm,\n// then go ahead and try to read some more preemptively.\nfunction maybeReadMore(stream, state) {\n  if (!state.readingMore) {\n    state.readingMore = true;\n    process.nextTick(function() {\n      maybeReadMore_(stream, state);\n    });\n  }\n}\n\nfunction maybeReadMore_(stream, state) {\n  var len = state.length;\n  while (!state.reading && !state.flowing && !state.ended &&\n         state.length < state.highWaterMark) {\n    stream.read(0);\n    if (len === state.length)\n      // didn't get any data, stop spinning.\n      break;\n    else\n      len = state.length;\n  }\n  state.readingMore = false;\n}\n\n// abstract method.  to be overridden in specific implementation classes.\n// call cb(er, data) where data is <= n in length.\n// for virtual (non-string, non-buffer) streams, \"length\" is somewhat\n// arbitrary, and perhaps not very meaningful.\nReadable.prototype._read = function(n) {\n  this.emit('error', new Error('not implemented'));\n};\n\nReadable.prototype.pipe = function(dest, pipeOpts) {\n  var src = this;\n  var state = this._readableState;\n\n  switch (state.pipesCount) {\n    case 0:\n      state.pipes = dest;\n      break;\n    case 1:\n      state.pipes = [state.pipes, dest];\n      break;\n    default:\n      state.pipes.push(dest);\n      break;\n  }\n  state.pipesCount += 1;\n\n  var doEnd = (!pipeOpts || pipeOpts.end !== false) &&\n              dest !== process.stdout &&\n              dest !== process.stderr;\n\n  var endFn = doEnd ? onend : cleanup;\n  if (state.endEmitted)\n    process.nextTick(endFn);\n  else\n    src.once('end', endFn);\n\n  dest.on('unpipe', onunpipe);\n  function onunpipe(readable) {\n    if (readable !== src) return;\n    cleanup();\n  }\n\n  function onend() {\n    dest.end();\n  }\n\n  // when the dest drains, it reduces the awaitDrain counter\n  // on the source.  This would be more elegant with a .once()\n  // handler in flow(), but adding and removing repeatedly is\n  // too slow.\n  var ondrain = pipeOnDrain(src);\n  dest.on('drain', ondrain);\n\n  function cleanup() {\n    // cleanup event handlers once the pipe is broken\n    dest.removeListener('close', onclose);\n    dest.removeListener('finish', onfinish);\n    dest.removeListener('drain', ondrain);\n    dest.removeListener('error', onerror);\n    dest.removeListener('unpipe', onunpipe);\n    src.removeListener('end', onend);\n    src.removeListener('end', cleanup);\n\n    // if the reader is waiting for a drain event from this\n    // specific writer, then it would cause it to never start\n    // flowing again.\n    // So, if this is awaiting a drain, then we just call it now.\n    // If we don't know, then assume that we are waiting for one.\n    if (!dest._writableState || dest._writableState.needDrain)\n      ondrain();\n  }\n\n  // if the dest has an error, then stop piping into it.\n  // however, don't suppress the throwing behavior for this.\n  function onerror(er) {\n    unpipe();\n    dest.removeListener('error', onerror);\n    if (EE.listenerCount(dest, 'error') === 0)\n      dest.emit('error', er);\n  }\n  // This is a brutally ugly hack to make sure that our error handler\n  // is attached before any userland ones.  NEVER DO THIS.\n  if (!dest._events || !dest._events.error)\n    dest.on('error', onerror);\n  else if (isArray(dest._events.error))\n    dest._events.error.unshift(onerror);\n  else\n    dest._events.error = [onerror, dest._events.error];\n\n\n\n  // Both close and finish should trigger unpipe, but only once.\n  function onclose() {\n    dest.removeListener('finish', onfinish);\n    unpipe();\n  }\n  dest.once('close', onclose);\n  function onfinish() {\n    dest.removeListener('close', onclose);\n    unpipe();\n  }\n  dest.once('finish', onfinish);\n\n  function unpipe() {\n    src.unpipe(dest);\n  }\n\n  // tell the dest that it's being piped to\n  dest.emit('pipe', src);\n\n  // start the flow if it hasn't been started already.\n  if (!state.flowing) {\n    // the handler that waits for readable events after all\n    // the data gets sucked out in flow.\n    // This would be easier to follow with a .once() handler\n    // in flow(), but that is too slow.\n    this.on('readable', pipeOnReadable);\n\n    state.flowing = true;\n    process.nextTick(function() {\n      flow(src);\n    });\n  }\n\n  return dest;\n};\n\nfunction pipeOnDrain(src) {\n  return function() {\n    var dest = this;\n    var state = src._readableState;\n    state.awaitDrain--;\n    if (state.awaitDrain === 0)\n      flow(src);\n  };\n}\n\nfunction flow(src) {\n  var state = src._readableState;\n  var chunk;\n  state.awaitDrain = 0;\n\n  function write(dest, i, list) {\n    var written = dest.write(chunk);\n    if (false === written) {\n      state.awaitDrain++;\n    }\n  }\n\n  while (state.pipesCount && null !== (chunk = src.read())) {\n\n    if (state.pipesCount === 1)\n      write(state.pipes, 0, null);\n    else\n      forEach(state.pipes, write);\n\n    src.emit('data', chunk);\n\n    // if anyone needs a drain, then we have to wait for that.\n    if (state.awaitDrain > 0)\n      return;\n  }\n\n  // if every destination was unpiped, either before entering this\n  // function, or in the while loop, then stop flowing.\n  //\n  // NB: This is a pretty rare edge case.\n  if (state.pipesCount === 0) {\n    state.flowing = false;\n\n    // if there were data event listeners added, then switch to old mode.\n    if (EE.listenerCount(src, 'data') > 0)\n      emitDataEvents(src);\n    return;\n  }\n\n  // at this point, no one needed a drain, so we just ran out of data\n  // on the next readable event, start it over again.\n  state.ranOut = true;\n}\n\nfunction pipeOnReadable() {\n  if (this._readableState.ranOut) {\n    this._readableState.ranOut = false;\n    flow(this);\n  }\n}\n\n\nReadable.prototype.unpipe = function(dest) {\n  var state = this._readableState;\n\n  // if we're not piping anywhere, then do nothing.\n  if (state.pipesCount === 0)\n    return this;\n\n  // just one destination.  most common case.\n  if (state.pipesCount === 1) {\n    // passed in one, but it's not the right one.\n    if (dest && dest !== state.pipes)\n      return this;\n\n    if (!dest)\n      dest = state.pipes;\n\n    // got a match.\n    state.pipes = null;\n    state.pipesCount = 0;\n    this.removeListener('readable', pipeOnReadable);\n    state.flowing = false;\n    if (dest)\n      dest.emit('unpipe', this);\n    return this;\n  }\n\n  // slow case. multiple pipe destinations.\n\n  if (!dest) {\n    // remove all.\n    var dests = state.pipes;\n    var len = state.pipesCount;\n    state.pipes = null;\n    state.pipesCount = 0;\n    this.removeListener('readable', pipeOnReadable);\n    state.flowing = false;\n\n    for (var i = 0; i < len; i++)\n      dests[i].emit('unpipe', this);\n    return this;\n  }\n\n  // try to find the right one.\n  var i = indexOf(state.pipes, dest);\n  if (i === -1)\n    return this;\n\n  state.pipes.splice(i, 1);\n  state.pipesCount -= 1;\n  if (state.pipesCount === 1)\n    state.pipes = state.pipes[0];\n\n  dest.emit('unpipe', this);\n\n  return this;\n};\n\n// set up data events if they are asked for\n// Ensure readable listeners eventually get something\nReadable.prototype.on = function(ev, fn) {\n  var res = Stream.prototype.on.call(this, ev, fn);\n\n  if (ev === 'data' && !this._readableState.flowing)\n    emitDataEvents(this);\n\n  if (ev === 'readable' && this.readable) {\n    var state = this._readableState;\n    if (!state.readableListening) {\n      state.readableListening = true;\n      state.emittedReadable = false;\n      state.needReadable = true;\n      if (!state.reading) {\n        this.read(0);\n      } else if (state.length) {\n        emitReadable(this, state);\n      }\n    }\n  }\n\n  return res;\n};\nReadable.prototype.addListener = Readable.prototype.on;\n\n// pause() and resume() are remnants of the legacy readable stream API\n// If the user uses them, then switch into old mode.\nReadable.prototype.resume = function() {\n  emitDataEvents(this);\n  this.read(0);\n  this.emit('resume');\n};\n\nReadable.prototype.pause = function() {\n  emitDataEvents(this, true);\n  this.emit('pause');\n};\n\nfunction emitDataEvents(stream, startPaused) {\n  var state = stream._readableState;\n\n  if (state.flowing) {\n    // https://github.com/isaacs/readable-stream/issues/16\n    throw new Error('Cannot switch to old mode now.');\n  }\n\n  var paused = startPaused || false;\n  var readable = false;\n\n  // convert to an old-style stream.\n  stream.readable = true;\n  stream.pipe = Stream.prototype.pipe;\n  stream.on = stream.addListener = Stream.prototype.on;\n\n  stream.on('readable', function() {\n    readable = true;\n\n    var c;\n    while (!paused && (null !== (c = stream.read())))\n      stream.emit('data', c);\n\n    if (c === null) {\n      readable = false;\n      stream._readableState.needReadable = true;\n    }\n  });\n\n  stream.pause = function() {\n    paused = true;\n    this.emit('pause');\n  };\n\n  stream.resume = function() {\n    paused = false;\n    if (readable)\n      process.nextTick(function() {\n        stream.emit('readable');\n      });\n    else\n      this.read(0);\n    this.emit('resume');\n  };\n\n  // now make it start, just in case it hadn't already.\n  stream.emit('readable');\n}\n\n// wrap an old-style stream as the async data source.\n// This is *not* part of the readable stream interface.\n// It is an ugly unfortunate mess of history.\nReadable.prototype.wrap = function(stream) {\n  var state = this._readableState;\n  var paused = false;\n\n  var self = this;\n  stream.on('end', function() {\n    if (state.decoder && !state.ended) {\n      var chunk = state.decoder.end();\n      if (chunk && chunk.length)\n        self.push(chunk);\n    }\n\n    self.push(null);\n  });\n\n  stream.on('data', function(chunk) {\n    if (state.decoder)\n      chunk = state.decoder.write(chunk);\n\n    // don't skip over falsy values in objectMode\n    //if (state.objectMode && util.isNullOrUndefined(chunk))\n    if (state.objectMode && (chunk === null || chunk === undefined))\n      return;\n    else if (!state.objectMode && (!chunk || !chunk.length))\n      return;\n\n    var ret = self.push(chunk);\n    if (!ret) {\n      paused = true;\n      stream.pause();\n    }\n  });\n\n  // proxy all the other methods.\n  // important when wrapping filters and duplexes.\n  for (var i in stream) {\n    if (typeof stream[i] === 'function' &&\n        typeof this[i] === 'undefined') {\n      this[i] = function(method) { return function() {\n        return stream[method].apply(stream, arguments);\n      }}(i);\n    }\n  }\n\n  // proxy certain important events.\n  var events = ['error', 'close', 'destroy', 'pause', 'resume'];\n  forEach(events, function(ev) {\n    stream.on(ev, self.emit.bind(self, ev));\n  });\n\n  // when we try to consume some more bytes, simply unpause the\n  // underlying stream.\n  self._read = function(n) {\n    if (paused) {\n      paused = false;\n      stream.resume();\n    }\n  };\n\n  return self;\n};\n\n\n\n// exposed for testing purposes only.\nReadable._fromList = fromList;\n\n// Pluck off n bytes from an array of buffers.\n// Length is the combined lengths of all the buffers in the list.\nfunction fromList(n, state) {\n  var list = state.buffer;\n  var length = state.length;\n  var stringMode = !!state.decoder;\n  var objectMode = !!state.objectMode;\n  var ret;\n\n  // nothing in the list, definitely empty.\n  if (list.length === 0)\n    return null;\n\n  if (length === 0)\n    ret = null;\n  else if (objectMode)\n    ret = list.shift();\n  else if (!n || n >= length) {\n    // read it all, truncate the array.\n    if (stringMode)\n      ret = list.join('');\n    else\n      ret = Buffer.concat(list, length);\n    list.length = 0;\n  } else {\n    // read just some of it.\n    if (n < list[0].length) {\n      // just take a part of the first list item.\n      // slice is the same for buffers and strings.\n      var buf = list[0];\n      ret = buf.slice(0, n);\n      list[0] = buf.slice(n);\n    } else if (n === list[0].length) {\n      // first list is a perfect match\n      ret = list.shift();\n    } else {\n      // complex case.\n      // we have enough to cover it, but it spans past the first buffer.\n      if (stringMode)\n        ret = '';\n      else\n        ret = new Buffer(n);\n\n      var c = 0;\n      for (var i = 0, l = list.length; i < l && c < n; i++) {\n        var buf = list[0];\n        var cpy = Math.min(n - c, buf.length);\n\n        if (stringMode)\n          ret += buf.slice(0, cpy);\n        else\n          buf.copy(ret, c, 0, cpy);\n\n        if (cpy < buf.length)\n          list[0] = buf.slice(cpy);\n        else\n          list.shift();\n\n        c += cpy;\n      }\n    }\n  }\n\n  return ret;\n}\n\nfunction endReadable(stream) {\n  var state = stream._readableState;\n\n  // If we get here before consuming all the bytes, then that is a\n  // bug in node.  Should never happen.\n  if (state.length > 0)\n    throw new Error('endReadable called on non-empty stream');\n\n  if (!state.endEmitted && state.calledRead) {\n    state.ended = true;\n    process.nextTick(function() {\n      // Check that we didn't get one last unshift.\n      if (!state.endEmitted && state.length === 0) {\n        state.endEmitted = true;\n        stream.readable = false;\n        stream.emit('end');\n      }\n    });\n  }\n}\n\nfunction forEach (xs, f) {\n  for (var i = 0, l = xs.length; i < l; i++) {\n    f(xs[i], i);\n  }\n}\n\nfunction indexOf (xs, x) {\n  for (var i = 0, l = xs.length; i < l; i++) {\n    if (xs[i] === x) return i;\n  }\n  return -1;\n}\n","// Copyright Joyent, Inc. and other Node contributors.\n//\n// Permission is hereby granted, free of charge, to any person obtaining a\n// copy of this software and associated documentation files (the\n// \"Software\"), to deal in the Software without restriction, including\n// without limitation the rights to use, copy, modify, merge, publish,\n// distribute, sublicense, and/or sell copies of the Software, and to permit\n// persons to whom the Software is furnished to do so, subject to the\n// following conditions:\n//\n// The above copyright notice and this permission notice shall be included\n// in all copies or substantial portions of the Software.\n//\n// THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS\n// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF\n// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN\n// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,\n// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR\n// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE\n// USE OR OTHER DEALINGS IN THE SOFTWARE.\n\n\n// a transform stream is a readable/writable stream where you do\n// something with the data.  Sometimes it's called a \"filter\",\n// but that's not a great name for it, since that implies a thing where\n// some bits pass through, and others are simply ignored.  (That would\n// be a valid example of a transform, of course.)\n//\n// While the output is causally related to the input, it's not a\n// necessarily symmetric or synchronous transformation.  For example,\n// a zlib stream might take multiple plain-text writes(), and then\n// emit a single compressed chunk some time in the future.\n//\n// Here's how this works:\n//\n// The Transform stream has all the aspects of the readable and writable\n// stream classes.  When you write(chunk), that calls _write(chunk,cb)\n// internally, and returns false if there's a lot of pending writes\n// buffered up.  When you call read(), that calls _read(n) until\n// there's enough pending readable data buffered up.\n//\n// In a transform stream, the written data is placed in a buffer.  When\n// _read(n) is called, it transforms the queued up data, calling the\n// buffered _write cb's as it consumes chunks.  If consuming a single\n// written chunk would result in multiple output chunks, then the first\n// outputted bit calls the readcb, and subsequent chunks just go into\n// the read buffer, and will cause it to emit 'readable' if necessary.\n//\n// This way, back-pressure is actually determined by the reading side,\n// since _read has to be called to start processing a new chunk.  However,\n// a pathological inflate type of transform can cause excessive buffering\n// here.  For example, imagine a stream where every byte of input is\n// interpreted as an integer from 0-255, and then results in that many\n// bytes of output.  Writing the 4 bytes {ff,ff,ff,ff} would result in\n// 1kb of data being output.  In this case, you could write a very small\n// amount of input, and end up with a very large amount of output.  In\n// such a pathological inflating mechanism, there'd be no way to tell\n// the system to stop doing the transform.  A single 4MB write could\n// cause the system to run out of memory.\n//\n// However, even in such a pathological case, only a single written chunk\n// would be consumed, and then the rest would wait (un-transformed) until\n// the results of the previous transformed chunk were consumed.\n\nmodule.exports = Transform;\n\nvar Duplex = require('./_stream_duplex');\n\n/*<replacement>*/\nvar util = require('core-util-is');\nutil.inherits = require('inherits');\n/*</replacement>*/\n\nutil.inherits(Transform, Duplex);\n\n\nfunction TransformState(options, stream) {\n  this.afterTransform = function(er, data) {\n    return afterTransform(stream, er, data);\n  };\n\n  this.needTransform = false;\n  this.transforming = false;\n  this.writecb = null;\n  this.writechunk = null;\n}\n\nfunction afterTransform(stream, er, data) {\n  var ts = stream._transformState;\n  ts.transforming = false;\n\n  var cb = ts.writecb;\n\n  if (!cb)\n    return stream.emit('error', new Error('no writecb in Transform class'));\n\n  ts.writechunk = null;\n  ts.writecb = null;\n\n  if (data !== null && data !== undefined)\n    stream.push(data);\n\n  if (cb)\n    cb(er);\n\n  var rs = stream._readableState;\n  rs.reading = false;\n  if (rs.needReadable || rs.length < rs.highWaterMark) {\n    stream._read(rs.highWaterMark);\n  }\n}\n\n\nfunction Transform(options) {\n  if (!(this instanceof Transform))\n    return new Transform(options);\n\n  Duplex.call(this, options);\n\n  var ts = this._transformState = new TransformState(options, this);\n\n  // when the writable side finishes, then flush out anything remaining.\n  var stream = this;\n\n  // start out asking for a readable event once data is transformed.\n  this._readableState.needReadable = true;\n\n  // we have implemented the _read method, and done the other things\n  // that Readable wants before the first _read call, so unset the\n  // sync guard flag.\n  this._readableState.sync = false;\n\n  this.once('finish', function() {\n    if ('function' === typeof this._flush)\n      this._flush(function(er) {\n        done(stream, er);\n      });\n    else\n      done(stream);\n  });\n}\n\nTransform.prototype.push = function(chunk, encoding) {\n  this._transformState.needTransform = false;\n  return Duplex.prototype.push.call(this, chunk, encoding);\n};\n\n// This is the part where you do stuff!\n// override this function in implementation classes.\n// 'chunk' is an input chunk.\n//\n// Call `push(newChunk)` to pass along transformed output\n// to the readable side.  You may call 'push' zero or more times.\n//\n// Call `cb(err)` when you are done with this chunk.  If you pass\n// an error, then that'll put the hurt on the whole operation.  If you\n// never call cb(), then you'll never get another chunk.\nTransform.prototype._transform = function(chunk, encoding, cb) {\n  throw new Error('not implemented');\n};\n\nTransform.prototype._write = function(chunk, encoding, cb) {\n  var ts = this._transformState;\n  ts.writecb = cb;\n  ts.writechunk = chunk;\n  ts.writeencoding = encoding;\n  if (!ts.transforming) {\n    var rs = this._readableState;\n    if (ts.needTransform ||\n        rs.needReadable ||\n        rs.length < rs.highWaterMark)\n      this._read(rs.highWaterMark);\n  }\n};\n\n// Doesn't matter what the args are here.\n// _transform does all the work.\n// That we got here means that the readable side wants more data.\nTransform.prototype._read = function(n) {\n  var ts = this._transformState;\n\n  if (ts.writechunk !== null && ts.writecb && !ts.transforming) {\n    ts.transforming = true;\n    this._transform(ts.writechunk, ts.writeencoding, ts.afterTransform);\n  } else {\n    // mark that we need a transform, so that any data that comes in\n    // will get processed, now that we've asked for it.\n    ts.needTransform = true;\n  }\n};\n\n\nfunction done(stream, er) {\n  if (er)\n    return stream.emit('error', er);\n\n  // if there's nothing in the write buffer, then that means\n  // that nothing more will ever be provided\n  var ws = stream._writableState;\n  var rs = stream._readableState;\n  var ts = stream._transformState;\n\n  if (ws.length)\n    throw new Error('calling transform done when ws.length != 0');\n\n  if (ts.transforming)\n    throw new Error('calling transform done when still transforming');\n\n  return stream.push(null);\n}\n","// Copyright Joyent, Inc. and other Node contributors.\n//\n// Permission is hereby granted, free of charge, to any person obtaining a\n// copy of this software and associated documentation files (the\n// \"Software\"), to deal in the Software without restriction, including\n// without limitation the rights to use, copy, modify, merge, publish,\n// distribute, sublicense, and/or sell copies of the Software, and to permit\n// persons to whom the Software is furnished to do so, subject to the\n// following conditions:\n//\n// The above copyright notice and this permission notice shall be included\n// in all copies or substantial portions of the Software.\n//\n// THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS\n// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF\n// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN\n// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,\n// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR\n// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE\n// USE OR OTHER DEALINGS IN THE SOFTWARE.\n\n// A bit simpler than readable streams.\n// Implement an async ._write(chunk, cb), and it'll handle all\n// the drain event emission and buffering.\n\nmodule.exports = Writable;\n\n/*<replacement>*/\nvar Buffer = require('buffer').Buffer;\n/*</replacement>*/\n\nWritable.WritableState = WritableState;\n\n\n/*<replacement>*/\nvar util = require('core-util-is');\nutil.inherits = require('inherits');\n/*</replacement>*/\n\nvar Stream = require('stream');\n\nutil.inherits(Writable, Stream);\n\nfunction WriteReq(chunk, encoding, cb) {\n  this.chunk = chunk;\n  this.encoding = encoding;\n  this.callback = cb;\n}\n\nfunction WritableState(options, stream) {\n  options = options || {};\n\n  // the point at which write() starts returning false\n  // Note: 0 is a valid value, means that we always return false if\n  // the entire buffer is not flushed immediately on write()\n  var hwm = options.highWaterMark;\n  this.highWaterMark = (hwm || hwm === 0) ? hwm : 16 * 1024;\n\n  // object stream flag to indicate whether or not this stream\n  // contains buffers or objects.\n  this.objectMode = !!options.objectMode;\n\n  // cast to ints.\n  this.highWaterMark = ~~this.highWaterMark;\n\n  this.needDrain = false;\n  // at the start of calling end()\n  this.ending = false;\n  // when end() has been called, and returned\n  this.ended = false;\n  // when 'finish' is emitted\n  this.finished = false;\n\n  // should we decode strings into buffers before passing to _write?\n  // this is here so that some node-core streams can optimize string\n  // handling at a lower level.\n  var noDecode = options.decodeStrings === false;\n  this.decodeStrings = !noDecode;\n\n  // Crypto is kind of old and crusty.  Historically, its default string\n  // encoding is 'binary' so we have to make this configurable.\n  // Everything else in the universe uses 'utf8', though.\n  this.defaultEncoding = options.defaultEncoding || 'utf8';\n\n  // not an actual buffer we keep track of, but a measurement\n  // of how much we're waiting to get pushed to some underlying\n  // socket or file.\n  this.length = 0;\n\n  // a flag to see when we're in the middle of a write.\n  this.writing = false;\n\n  // a flag to be able to tell if the onwrite cb is called immediately,\n  // or on a later tick.  We set this to true at first, becuase any\n  // actions that shouldn't happen until \"later\" should generally also\n  // not happen before the first write call.\n  this.sync = true;\n\n  // a flag to know if we're processing previously buffered items, which\n  // may call the _write() callback in the same tick, so that we don't\n  // end up in an overlapped onwrite situation.\n  this.bufferProcessing = false;\n\n  // the callback that's passed to _write(chunk,cb)\n  this.onwrite = function(er) {\n    onwrite(stream, er);\n  };\n\n  // the callback that the user supplies to write(chunk,encoding,cb)\n  this.writecb = null;\n\n  // the amount that is being written when _write is called.\n  this.writelen = 0;\n\n  this.buffer = [];\n\n  // True if the error was already emitted and should not be thrown again\n  this.errorEmitted = false;\n}\n\nfunction Writable(options) {\n  var Duplex = require('./_stream_duplex');\n\n  // Writable ctor is applied to Duplexes, though they're not\n  // instanceof Writable, they're instanceof Readable.\n  if (!(this instanceof Writable) && !(this instanceof Duplex))\n    return new Writable(options);\n\n  this._writableState = new WritableState(options, this);\n\n  // legacy.\n  this.writable = true;\n\n  Stream.call(this);\n}\n\n// Otherwise people can pipe Writable streams, which is just wrong.\nWritable.prototype.pipe = function() {\n  this.emit('error', new Error('Cannot pipe. Not readable.'));\n};\n\n\nfunction writeAfterEnd(stream, state, cb) {\n  var er = new Error('write after end');\n  // TODO: defer error events consistently everywhere, not just the cb\n  stream.emit('error', er);\n  process.nextTick(function() {\n    cb(er);\n  });\n}\n\n// If we get something that is not a buffer, string, null, or undefined,\n// and we're not in objectMode, then that's an error.\n// Otherwise stream chunks are all considered to be of length=1, and the\n// watermarks determine how many objects to keep in the buffer, rather than\n// how many bytes or characters.\nfunction validChunk(stream, state, chunk, cb) {\n  var valid = true;\n  if (!Buffer.isBuffer(chunk) &&\n      'string' !== typeof chunk &&\n      chunk !== null &&\n      chunk !== undefined &&\n      !state.objectMode) {\n    var er = new TypeError('Invalid non-string/buffer chunk');\n    stream.emit('error', er);\n    process.nextTick(function() {\n      cb(er);\n    });\n    valid = false;\n  }\n  return valid;\n}\n\nWritable.prototype.write = function(chunk, encoding, cb) {\n  var state = this._writableState;\n  var ret = false;\n\n  if (typeof encoding === 'function') {\n    cb = encoding;\n    encoding = null;\n  }\n\n  if (Buffer.isBuffer(chunk))\n    encoding = 'buffer';\n  else if (!encoding)\n    encoding = state.defaultEncoding;\n\n  if (typeof cb !== 'function')\n    cb = function() {};\n\n  if (state.ended)\n    writeAfterEnd(this, state, cb);\n  else if (validChunk(this, state, chunk, cb))\n    ret = writeOrBuffer(this, state, chunk, encoding, cb);\n\n  return ret;\n};\n\nfunction decodeChunk(state, chunk, encoding) {\n  if (!state.objectMode &&\n      state.decodeStrings !== false &&\n      typeof chunk === 'string') {\n    chunk = new Buffer(chunk, encoding);\n  }\n  return chunk;\n}\n\n// if we're already writing something, then just put this\n// in the queue, and wait our turn.  Otherwise, call _write\n// If we return false, then we need a drain event, so set that flag.\nfunction writeOrBuffer(stream, state, chunk, encoding, cb) {\n  chunk = decodeChunk(state, chunk, encoding);\n  if (Buffer.isBuffer(chunk))\n    encoding = 'buffer';\n  var len = state.objectMode ? 1 : chunk.length;\n\n  state.length += len;\n\n  var ret = state.length < state.highWaterMark;\n  // we must ensure that previous needDrain will not be reset to false.\n  if (!ret)\n    state.needDrain = true;\n\n  if (state.writing)\n    state.buffer.push(new WriteReq(chunk, encoding, cb));\n  else\n    doWrite(stream, state, len, chunk, encoding, cb);\n\n  return ret;\n}\n\nfunction doWrite(stream, state, len, chunk, encoding, cb) {\n  state.writelen = len;\n  state.writecb = cb;\n  state.writing = true;\n  state.sync = true;\n  stream._write(chunk, encoding, state.onwrite);\n  state.sync = false;\n}\n\nfunction onwriteError(stream, state, sync, er, cb) {\n  if (sync)\n    process.nextTick(function() {\n      cb(er);\n    });\n  else\n    cb(er);\n\n  stream._writableState.errorEmitted = true;\n  stream.emit('error', er);\n}\n\nfunction onwriteStateUpdate(state) {\n  state.writing = false;\n  state.writecb = null;\n  state.length -= state.writelen;\n  state.writelen = 0;\n}\n\nfunction onwrite(stream, er) {\n  var state = stream._writableState;\n  var sync = state.sync;\n  var cb = state.writecb;\n\n  onwriteStateUpdate(state);\n\n  if (er)\n    onwriteError(stream, state, sync, er, cb);\n  else {\n    // Check if we're actually ready to finish, but don't emit yet\n    var finished = needFinish(stream, state);\n\n    if (!finished && !state.bufferProcessing && state.buffer.length)\n      clearBuffer(stream, state);\n\n    if (sync) {\n      process.nextTick(function() {\n        afterWrite(stream, state, finished, cb);\n      });\n    } else {\n      afterWrite(stream, state, finished, cb);\n    }\n  }\n}\n\nfunction afterWrite(stream, state, finished, cb) {\n  if (!finished)\n    onwriteDrain(stream, state);\n  cb();\n  if (finished)\n    finishMaybe(stream, state);\n}\n\n// Must force callback to be called on nextTick, so that we don't\n// emit 'drain' before the write() consumer gets the 'false' return\n// value, and has a chance to attach a 'drain' listener.\nfunction onwriteDrain(stream, state) {\n  if (state.length === 0 && state.needDrain) {\n    state.needDrain = false;\n    stream.emit('drain');\n  }\n}\n\n\n// if there's something in the buffer waiting, then process it\nfunction clearBuffer(stream, state) {\n  state.bufferProcessing = true;\n\n  for (var c = 0; c < state.buffer.length; c++) {\n    var entry = state.buffer[c];\n    var chunk = entry.chunk;\n    var encoding = entry.encoding;\n    var cb = entry.callback;\n    var len = state.objectMode ? 1 : chunk.length;\n\n    doWrite(stream, state, len, chunk, encoding, cb);\n\n    // if we didn't call the onwrite immediately, then\n    // it means that we need to wait until it does.\n    // also, that means that the chunk and cb are currently\n    // being processed, so move the buffer counter past them.\n    if (state.writing) {\n      c++;\n      break;\n    }\n  }\n\n  state.bufferProcessing = false;\n  if (c < state.buffer.length)\n    state.buffer = state.buffer.slice(c);\n  else\n    state.buffer.length = 0;\n}\n\nWritable.prototype._write = function(chunk, encoding, cb) {\n  cb(new Error('not implemented'));\n};\n\nWritable.prototype.end = function(chunk, encoding, cb) {\n  var state = this._writableState;\n\n  if (typeof chunk === 'function') {\n    cb = chunk;\n    chunk = null;\n    encoding = null;\n  } else if (typeof encoding === 'function') {\n    cb = encoding;\n    encoding = null;\n  }\n\n  if (typeof chunk !== 'undefined' && chunk !== null)\n    this.write(chunk, encoding);\n\n  // ignore unnecessary end() calls.\n  if (!state.ending && !state.finished)\n    endWritable(this, state, cb);\n};\n\n\nfunction needFinish(stream, state) {\n  return (state.ending &&\n          state.length === 0 &&\n          !state.finished &&\n          !state.writing);\n}\n\nfunction finishMaybe(stream, state) {\n  var need = needFinish(stream, state);\n  if (need) {\n    state.finished = true;\n    stream.emit('finish');\n  }\n  return need;\n}\n\nfunction endWritable(stream, state, cb) {\n  state.ending = true;\n  finishMaybe(stream, state);\n  if (cb) {\n    if (state.finished)\n      process.nextTick(cb);\n    else\n      stream.once('finish', cb);\n  }\n  state.ended = true;\n}\n","var Stream = require('stream'); // hack to fix a circular dependency issue when used with browserify\nexports = module.exports = require('./lib/_stream_readable.js');\nexports.Stream = Stream;\nexports.Readable = exports;\nexports.Writable = require('./lib/_stream_writable.js');\nexports.Duplex = require('./lib/_stream_duplex.js');\nexports.Transform = require('./lib/_stream_transform.js');\nexports.PassThrough = require('./lib/_stream_passthrough.js');\nif (!process.browser && process.env.READABLE_STREAM === 'disable') {\n  module.exports = require('stream');\n}\n","// Copyright Joyent, Inc. and other Node contributors.\n//\n// Permission is hereby granted, free of charge, to any person obtaining a\n// copy of this software and associated documentation files (the\n// \"Software\"), to deal in the Software without restriction, including\n// without limitation the rights to use, copy, modify, merge, publish,\n// distribute, sublicense, and/or sell copies of the Software, and to permit\n// persons to whom the Software is furnished to do so, subject to the\n// following conditions:\n//\n// The above copyright notice and this permission notice shall be included\n// in all copies or substantial portions of the Software.\n//\n// THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS\n// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF\n// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN\n// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,\n// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR\n// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE\n// USE OR OTHER DEALINGS IN THE SOFTWARE.\n\nvar Buffer = require('buffer').Buffer;\n\nvar isBufferEncoding = Buffer.isEncoding\n  || function(encoding) {\n       switch (encoding && encoding.toLowerCase()) {\n         case 'hex': case 'utf8': case 'utf-8': case 'ascii': case 'binary': case 'base64': case 'ucs2': case 'ucs-2': case 'utf16le': case 'utf-16le': case 'raw': return true;\n         default: return false;\n       }\n     }\n\n\nfunction assertEncoding(encoding) {\n  if (encoding && !isBufferEncoding(encoding)) {\n    throw new Error('Unknown encoding: ' + encoding);\n  }\n}\n\n// StringDecoder provides an interface for efficiently splitting a series of\n// buffers into a series of JS strings without breaking apart multi-byte\n// characters. CESU-8 is handled as part of the UTF-8 encoding.\n//\n// @TODO Handling all encodings inside a single object makes it very difficult\n// to reason about this code, so it should be split up in the future.\n// @TODO There should be a utf8-strict encoding that rejects invalid UTF-8 code\n// points as used by CESU-8.\nvar StringDecoder = exports.StringDecoder = function(encoding) {\n  this.encoding = (encoding || 'utf8').toLowerCase().replace(/[-_]/, '');\n  assertEncoding(encoding);\n  switch (this.encoding) {\n    case 'utf8':\n      // CESU-8 represents each of Surrogate Pair by 3-bytes\n      this.surrogateSize = 3;\n      break;\n    case 'ucs2':\n    case 'utf16le':\n      // UTF-16 represents each of Surrogate Pair by 2-bytes\n      this.surrogateSize = 2;\n      this.detectIncompleteChar = utf16DetectIncompleteChar;\n      break;\n    case 'base64':\n      // Base-64 stores 3 bytes in 4 chars, and pads the remainder.\n      this.surrogateSize = 3;\n      this.detectIncompleteChar = base64DetectIncompleteChar;\n      break;\n    default:\n      this.write = passThroughWrite;\n      return;\n  }\n\n  // Enough space to store all bytes of a single character. UTF-8 needs 4\n  // bytes, but CESU-8 may require up to 6 (3 bytes per surrogate).\n  this.charBuffer = new Buffer(6);\n  // Number of bytes received for the current incomplete multi-byte character.\n  this.charReceived = 0;\n  // Number of bytes expected for the current incomplete multi-byte character.\n  this.charLength = 0;\n};\n\n\n// write decodes the given buffer and returns it as JS string that is\n// guaranteed to not contain any partial multi-byte characters. Any partial\n// character found at the end of the buffer is buffered up, and will be\n// returned when calling write again with the remaining bytes.\n//\n// Note: Converting a Buffer containing an orphan surrogate to a String\n// currently works, but converting a String to a Buffer (via `new Buffer`, or\n// Buffer#write) will replace incomplete surrogates with the unicode\n// replacement character. See https://codereview.chromium.org/121173009/ .\nStringDecoder.prototype.write = function(buffer) {\n  var charStr = '';\n  // if our last write ended with an incomplete multibyte character\n  while (this.charLength) {\n    // determine how many remaining bytes this buffer has to offer for this char\n    var available = (buffer.length >= this.charLength - this.charReceived) ?\n        this.charLength - this.charReceived :\n        buffer.length;\n\n    // add the new bytes to the char buffer\n    buffer.copy(this.charBuffer, this.charReceived, 0, available);\n    this.charReceived += available;\n\n    if (this.charReceived < this.charLength) {\n      // still not enough chars in this buffer? wait for more ...\n      return '';\n    }\n\n    // remove bytes belonging to the current character from the buffer\n    buffer = buffer.slice(available, buffer.length);\n\n    // get the character that was split\n    charStr = this.charBuffer.slice(0, this.charLength).toString(this.encoding);\n\n    // CESU-8: lead surrogate (D800-DBFF) is also the incomplete character\n    var charCode = charStr.charCodeAt(charStr.length - 1);\n    if (charCode >= 0xD800 && charCode <= 0xDBFF) {\n      this.charLength += this.surrogateSize;\n      charStr = '';\n      continue;\n    }\n    this.charReceived = this.charLength = 0;\n\n    // if there are no more bytes in this buffer, just emit our char\n    if (buffer.length === 0) {\n      return charStr;\n    }\n    break;\n  }\n\n  // determine and set charLength / charReceived\n  this.detectIncompleteChar(buffer);\n\n  var end = buffer.length;\n  if (this.charLength) {\n    // buffer the incomplete character bytes we got\n    buffer.copy(this.charBuffer, 0, buffer.length - this.charReceived, end);\n    end -= this.charReceived;\n  }\n\n  charStr += buffer.toString(this.encoding, 0, end);\n\n  var end = charStr.length - 1;\n  var charCode = charStr.charCodeAt(end);\n  // CESU-8: lead surrogate (D800-DBFF) is also the incomplete character\n  if (charCode >= 0xD800 && charCode <= 0xDBFF) {\n    var size = this.surrogateSize;\n    this.charLength += size;\n    this.charReceived += size;\n    this.charBuffer.copy(this.charBuffer, size, 0, size);\n    buffer.copy(this.charBuffer, 0, 0, size);\n    return charStr.substring(0, end);\n  }\n\n  // or just emit the charStr\n  return charStr;\n};\n\n// detectIncompleteChar determines if there is an incomplete UTF-8 character at\n// the end of the given buffer. If so, it sets this.charLength to the byte\n// length that character, and sets this.charReceived to the number of bytes\n// that are available for this character.\nStringDecoder.prototype.detectIncompleteChar = function(buffer) {\n  // determine how many bytes we have to check at the end of this buffer\n  var i = (buffer.length >= 3) ? 3 : buffer.length;\n\n  // Figure out if one of the last i bytes of our buffer announces an\n  // incomplete char.\n  for (; i > 0; i--) {\n    var c = buffer[buffer.length - i];\n\n    // See http://en.wikipedia.org/wiki/UTF-8#Description\n\n    // 110XXXXX\n    if (i == 1 && c >> 5 == 0x06) {\n      this.charLength = 2;\n      break;\n    }\n\n    // 1110XXXX\n    if (i <= 2 && c >> 4 == 0x0E) {\n      this.charLength = 3;\n      break;\n    }\n\n    // 11110XXX\n    if (i <= 3 && c >> 3 == 0x1E) {\n      this.charLength = 4;\n      break;\n    }\n  }\n  this.charReceived = i;\n};\n\nStringDecoder.prototype.end = function(buffer) {\n  var res = '';\n  if (buffer && buffer.length)\n    res = this.write(buffer);\n\n  if (this.charReceived) {\n    var cr = this.charReceived;\n    var buf = this.charBuffer;\n    var enc = this.encoding;\n    res += buf.slice(0, cr).toString(enc);\n  }\n\n  return res;\n};\n\nfunction passThroughWrite(buffer) {\n  return buffer.toString(this.encoding);\n}\n\nfunction utf16DetectIncompleteChar(buffer) {\n  this.charReceived = buffer.length % 2;\n  this.charLength = this.charReceived ? 2 : 0;\n}\n\nfunction base64DetectIncompleteChar(buffer) {\n  this.charReceived = buffer.length % 3;\n  this.charLength = this.charReceived ? 3 : 0;\n}\n"],"names":[],"sourceRoot":""}