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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","var 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","// 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 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","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","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\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// 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\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"],"names":[],"sourceRoot":""}