+++ /dev/null
-// Copyright Joyent, Inc. and other Node contributors.
-//
-// Permission is hereby granted, free of charge, to any person obtaining a
-// copy of this software and associated documentation files (the
-// "Software"), to deal in the Software without restriction, including
-// without limitation the rights to use, copy, modify, merge, publish,
-// distribute, sublicense, and/or sell copies of the Software, and to permit
-// persons to whom the Software is furnished to do so, subject to the
-// following conditions:
-//
-// The above copyright notice and this permission notice shall be included
-// in all copies or substantial portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
-// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
-// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
-// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
-// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
-// USE OR OTHER DEALINGS IN THE SOFTWARE.
-'use strict';
-
-module.exports = Readable;
-/*<replacement>*/
-
-var Duplex;
-/*</replacement>*/
-
-Readable.ReadableState = ReadableState;
-/*<replacement>*/
-
-var EE = require('events').EventEmitter;
-
-var EElistenerCount = function EElistenerCount(emitter, type) {
- return emitter.listeners(type).length;
-};
-/*</replacement>*/
-
-/*<replacement>*/
-
-
-var Stream = require('./internal/streams/stream');
-/*</replacement>*/
-
-
-var Buffer = require('buffer').Buffer;
-
-var OurUint8Array = global.Uint8Array || function () {};
-
-function _uint8ArrayToBuffer(chunk) {
- return Buffer.from(chunk);
-}
-
-function _isUint8Array(obj) {
- return Buffer.isBuffer(obj) || obj instanceof OurUint8Array;
-}
-/*<replacement>*/
-
-
-var debugUtil = require('util');
-
-var debug;
-
-if (debugUtil && debugUtil.debuglog) {
- debug = debugUtil.debuglog('stream');
-} else {
- debug = function debug() {};
-}
-/*</replacement>*/
-
-
-var BufferList = require('./internal/streams/buffer_list');
-
-var destroyImpl = require('./internal/streams/destroy');
-
-var _require = require('./internal/streams/state'),
- getHighWaterMark = _require.getHighWaterMark;
-
-var _require$codes = require('../errors').codes,
- ERR_INVALID_ARG_TYPE = _require$codes.ERR_INVALID_ARG_TYPE,
- ERR_STREAM_PUSH_AFTER_EOF = _require$codes.ERR_STREAM_PUSH_AFTER_EOF,
- ERR_METHOD_NOT_IMPLEMENTED = _require$codes.ERR_METHOD_NOT_IMPLEMENTED,
- ERR_STREAM_UNSHIFT_AFTER_END_EVENT = _require$codes.ERR_STREAM_UNSHIFT_AFTER_END_EVENT; // Lazy loaded to improve the startup performance.
-
-
-var StringDecoder;
-var createReadableStreamAsyncIterator;
-var from;
-
-require('inherits')(Readable, Stream);
-
-var errorOrDestroy = destroyImpl.errorOrDestroy;
-var kProxyEvents = ['error', 'close', 'destroy', 'pause', 'resume'];
-
-function prependListener(emitter, event, fn) {
- // Sadly this is not cacheable as some libraries bundle their own
- // event emitter implementation with them.
- if (typeof emitter.prependListener === 'function') return emitter.prependListener(event, fn); // This is a hack to make sure that our error handler is attached before any
- // userland ones. NEVER DO THIS. This is here only because this code needs
- // to continue to work with older versions of Node.js that do not include
- // the prependListener() method. The goal is to eventually remove this hack.
-
- if (!emitter._events || !emitter._events[event]) emitter.on(event, fn);else if (Array.isArray(emitter._events[event])) emitter._events[event].unshift(fn);else emitter._events[event] = [fn, emitter._events[event]];
-}
-
-function ReadableState(options, stream, isDuplex) {
- Duplex = Duplex || require('./_stream_duplex');
- options = options || {}; // Duplex streams are both readable and writable, but share
- // the same options object.
- // However, some cases require setting options to different
- // values for the readable and the writable sides of the duplex stream.
- // These options can be provided separately as readableXXX and writableXXX.
-
- if (typeof isDuplex !== 'boolean') isDuplex = stream instanceof Duplex; // object stream flag. Used to make read(n) ignore n and to
- // make all the buffer merging and length checks go away
-
- this.objectMode = !!options.objectMode;
- if (isDuplex) this.objectMode = this.objectMode || !!options.readableObjectMode; // the point at which it stops calling _read() to fill the buffer
- // Note: 0 is a valid value, means "don't call _read preemptively ever"
-
- this.highWaterMark = getHighWaterMark(this, options, 'readableHighWaterMark', isDuplex); // A linked list is used to store data chunks instead of an array because the
- // linked list can remove elements from the beginning faster than
- // array.shift()
-
- this.buffer = new BufferList();
- this.length = 0;
- this.pipes = null;
- this.pipesCount = 0;
- this.flowing = null;
- this.ended = false;
- this.endEmitted = false;
- this.reading = false; // a flag to be able to tell if the event 'readable'/'data' is emitted
- // immediately, or on a later tick. We set this to true at first, because
- // any actions that shouldn't happen until "later" should generally also
- // not happen before the first read call.
-
- this.sync = true; // whenever we return null, then we set a flag to say
- // that we're awaiting a 'readable' event emission.
-
- this.needReadable = false;
- this.emittedReadable = false;
- this.readableListening = false;
- this.resumeScheduled = false;
- this.paused = true; // Should close be emitted on destroy. Defaults to true.
-
- this.emitClose = options.emitClose !== false; // Should .destroy() be called after 'end' (and potentially 'finish')
-
- this.autoDestroy = !!options.autoDestroy; // has it been destroyed
-
- this.destroyed = false; // Crypto is kind of old and crusty. Historically, its default string
- // encoding is 'binary' so we have to make this configurable.
- // Everything else in the universe uses 'utf8', though.
-
- this.defaultEncoding = options.defaultEncoding || 'utf8'; // the number of writers that are awaiting a drain event in .pipe()s
-
- this.awaitDrain = 0; // if true, a maybeReadMore has been scheduled
-
- this.readingMore = false;
- this.decoder = null;
- this.encoding = null;
-
- if (options.encoding) {
- if (!StringDecoder) StringDecoder = require('string_decoder/').StringDecoder;
- this.decoder = new StringDecoder(options.encoding);
- this.encoding = options.encoding;
- }
-}
-
-function Readable(options) {
- Duplex = Duplex || require('./_stream_duplex');
- if (!(this instanceof Readable)) return new Readable(options); // Checking for a Stream.Duplex instance is faster here instead of inside
- // the ReadableState constructor, at least with V8 6.5
-
- var isDuplex = this instanceof Duplex;
- this._readableState = new ReadableState(options, this, isDuplex); // legacy
-
- this.readable = true;
-
- if (options) {
- if (typeof options.read === 'function') this._read = options.read;
- if (typeof options.destroy === 'function') this._destroy = options.destroy;
- }
-
- Stream.call(this);
-}
-
-Object.defineProperty(Readable.prototype, 'destroyed', {
- // making it explicit this property is not enumerable
- // because otherwise some prototype manipulation in
- // userland will fail
- enumerable: false,
- get: function get() {
- if (this._readableState === undefined) {
- return false;
- }
-
- return this._readableState.destroyed;
- },
- set: function set(value) {
- // we ignore the value if the stream
- // has not been initialized yet
- if (!this._readableState) {
- return;
- } // backward compatibility, the user is explicitly
- // managing destroyed
-
-
- this._readableState.destroyed = value;
- }
-});
-Readable.prototype.destroy = destroyImpl.destroy;
-Readable.prototype._undestroy = destroyImpl.undestroy;
-
-Readable.prototype._destroy = function (err, cb) {
- cb(err);
-}; // Manually shove something into the read() buffer.
-// This returns true if the highWaterMark has not been hit yet,
-// similar to how Writable.write() returns true if you should
-// write() some more.
-
-
-Readable.prototype.push = function (chunk, encoding) {
- var state = this._readableState;
- var skipChunkCheck;
-
- if (!state.objectMode) {
- if (typeof chunk === 'string') {
- encoding = encoding || state.defaultEncoding;
-
- if (encoding !== state.encoding) {
- chunk = Buffer.from(chunk, encoding);
- encoding = '';
- }
-
- skipChunkCheck = true;
- }
- } else {
- skipChunkCheck = true;
- }
-
- return readableAddChunk(this, chunk, encoding, false, skipChunkCheck);
-}; // Unshift should *always* be something directly out of read()
-
-
-Readable.prototype.unshift = function (chunk) {
- return readableAddChunk(this, chunk, null, true, false);
-};
-
-function readableAddChunk(stream, chunk, encoding, addToFront, skipChunkCheck) {
- debug('readableAddChunk', chunk);
- var state = stream._readableState;
-
- if (chunk === null) {
- state.reading = false;
- onEofChunk(stream, state);
- } else {
- var er;
- if (!skipChunkCheck) er = chunkInvalid(state, chunk);
-
- if (er) {
- errorOrDestroy(stream, er);
- } else if (state.objectMode || chunk && chunk.length > 0) {
- if (typeof chunk !== 'string' && !state.objectMode && Object.getPrototypeOf(chunk) !== Buffer.prototype) {
- chunk = _uint8ArrayToBuffer(chunk);
- }
-
- if (addToFront) {
- if (state.endEmitted) errorOrDestroy(stream, new ERR_STREAM_UNSHIFT_AFTER_END_EVENT());else addChunk(stream, state, chunk, true);
- } else if (state.ended) {
- errorOrDestroy(stream, new ERR_STREAM_PUSH_AFTER_EOF());
- } else if (state.destroyed) {
- return false;
- } else {
- state.reading = false;
-
- if (state.decoder && !encoding) {
- chunk = state.decoder.write(chunk);
- if (state.objectMode || chunk.length !== 0) addChunk(stream, state, chunk, false);else maybeReadMore(stream, state);
- } else {
- addChunk(stream, state, chunk, false);
- }
- }
- } else if (!addToFront) {
- state.reading = false;
- maybeReadMore(stream, state);
- }
- } // We can push more data if we are below the highWaterMark.
- // Also, if we have no data yet, we can stand some more bytes.
- // This is to work around cases where hwm=0, such as the repl.
-
-
- return !state.ended && (state.length < state.highWaterMark || state.length === 0);
-}
-
-function addChunk(stream, state, chunk, addToFront) {
- if (state.flowing && state.length === 0 && !state.sync) {
- state.awaitDrain = 0;
- stream.emit('data', chunk);
- } else {
- // update the buffer info.
- state.length += state.objectMode ? 1 : chunk.length;
- if (addToFront) state.buffer.unshift(chunk);else state.buffer.push(chunk);
- if (state.needReadable) emitReadable(stream);
- }
-
- maybeReadMore(stream, state);
-}
-
-function chunkInvalid(state, chunk) {
- var er;
-
- if (!_isUint8Array(chunk) && typeof chunk !== 'string' && chunk !== undefined && !state.objectMode) {
- er = new ERR_INVALID_ARG_TYPE('chunk', ['string', 'Buffer', 'Uint8Array'], chunk);
- }
-
- return er;
-}
-
-Readable.prototype.isPaused = function () {
- return this._readableState.flowing === false;
-}; // backwards compatibility.
-
-
-Readable.prototype.setEncoding = function (enc) {
- if (!StringDecoder) StringDecoder = require('string_decoder/').StringDecoder;
- var decoder = new StringDecoder(enc);
- this._readableState.decoder = decoder; // If setEncoding(null), decoder.encoding equals utf8
-
- this._readableState.encoding = this._readableState.decoder.encoding; // Iterate over current buffer to convert already stored Buffers:
-
- var p = this._readableState.buffer.head;
- var content = '';
-
- while (p !== null) {
- content += decoder.write(p.data);
- p = p.next;
- }
-
- this._readableState.buffer.clear();
-
- if (content !== '') this._readableState.buffer.push(content);
- this._readableState.length = content.length;
- return this;
-}; // Don't raise the hwm > 1GB
-
-
-var MAX_HWM = 0x40000000;
-
-function computeNewHighWaterMark(n) {
- if (n >= MAX_HWM) {
- // TODO(ronag): Throw ERR_VALUE_OUT_OF_RANGE.
- n = MAX_HWM;
- } else {
- // Get the next highest power of 2 to prevent increasing hwm excessively in
- // tiny amounts
- n--;
- n |= n >>> 1;
- n |= n >>> 2;
- n |= n >>> 4;
- n |= n >>> 8;
- n |= n >>> 16;
- n++;
- }
-
- return n;
-} // This function is designed to be inlinable, so please take care when making
-// changes to the function body.
-
-
-function howMuchToRead(n, state) {
- if (n <= 0 || state.length === 0 && state.ended) return 0;
- if (state.objectMode) return 1;
-
- if (n !== n) {
- // Only flow one buffer at a time
- if (state.flowing && state.length) return state.buffer.head.data.length;else return state.length;
- } // If we're asking for more than the current hwm, then raise the hwm.
-
-
- if (n > state.highWaterMark) state.highWaterMark = computeNewHighWaterMark(n);
- if (n <= state.length) return n; // Don't have enough
-
- if (!state.ended) {
- state.needReadable = true;
- return 0;
- }
-
- return state.length;
-} // you can override either this method, or the async _read(n) below.
-
-
-Readable.prototype.read = function (n) {
- debug('read', n);
- n = parseInt(n, 10);
- var state = this._readableState;
- var nOrig = n;
- if (n !== 0) state.emittedReadable = false; // if we're doing read(0) to trigger a readable event, but we
- // already have a bunch of data in the buffer, then just trigger
- // the 'readable' event and move on.
-
- if (n === 0 && state.needReadable && ((state.highWaterMark !== 0 ? state.length >= state.highWaterMark : state.length > 0) || state.ended)) {
- debug('read: emitReadable', state.length, state.ended);
- if (state.length === 0 && state.ended) endReadable(this);else emitReadable(this);
- return null;
- }
-
- n = howMuchToRead(n, state); // if we've ended, and we're now clear, then finish it up.
-
- if (n === 0 && state.ended) {
- if (state.length === 0) endReadable(this);
- return null;
- } // All the actual chunk generation logic needs to be
- // *below* the call to _read. The reason is that in certain
- // synthetic stream cases, such as passthrough streams, _read
- // may be a completely synchronous operation which may change
- // the state of the read buffer, providing enough data when
- // before there was *not* enough.
- //
- // So, the steps are:
- // 1. Figure out what the state of things will be after we do
- // a read from the buffer.
- //
- // 2. If that resulting state will trigger a _read, then call _read.
- // Note that this may be asynchronous, or synchronous. Yes, it is
- // deeply ugly to write APIs this way, but that still doesn't mean
- // that the Readable class should behave improperly, as streams are
- // designed to be sync/async agnostic.
- // Take note if the _read call is sync or async (ie, if the read call
- // has returned yet), so that we know whether or not it's safe to emit
- // 'readable' etc.
- //
- // 3. Actually pull the requested chunks out of the buffer and return.
- // if we need a readable event, then we need to do some reading.
-
-
- var doRead = state.needReadable;
- debug('need readable', doRead); // if we currently have less than the highWaterMark, then also read some
-
- if (state.length === 0 || state.length - n < state.highWaterMark) {
- doRead = true;
- debug('length less than watermark', doRead);
- } // however, if we've ended, then there's no point, and if we're already
- // reading, then it's unnecessary.
-
-
- if (state.ended || state.reading) {
- doRead = false;
- debug('reading or ended', doRead);
- } else if (doRead) {
- debug('do read');
- state.reading = true;
- state.sync = true; // if the length is currently zero, then we *need* a readable event.
-
- if (state.length === 0) state.needReadable = true; // call internal read method
-
- this._read(state.highWaterMark);
-
- state.sync = false; // If _read pushed data synchronously, then `reading` will be false,
- // and we need to re-evaluate how much data we can return to the user.
-
- if (!state.reading) n = howMuchToRead(nOrig, state);
- }
-
- var ret;
- if (n > 0) ret = fromList(n, state);else ret = null;
-
- if (ret === null) {
- state.needReadable = state.length <= state.highWaterMark;
- n = 0;
- } else {
- state.length -= n;
- state.awaitDrain = 0;
- }
-
- if (state.length === 0) {
- // If we have nothing in the buffer, then we want to know
- // as soon as we *do* get something into the buffer.
- if (!state.ended) state.needReadable = true; // If we tried to read() past the EOF, then emit end on the next tick.
-
- if (nOrig !== n && state.ended) endReadable(this);
- }
-
- if (ret !== null) this.emit('data', ret);
- return ret;
-};
-
-function onEofChunk(stream, state) {
- debug('onEofChunk');
- if (state.ended) return;
-
- if (state.decoder) {
- var chunk = state.decoder.end();
-
- if (chunk && chunk.length) {
- state.buffer.push(chunk);
- state.length += state.objectMode ? 1 : chunk.length;
- }
- }
-
- state.ended = true;
-
- if (state.sync) {
- // if we are sync, wait until next tick to emit the data.
- // Otherwise we risk emitting data in the flow()
- // the readable code triggers during a read() call
- emitReadable(stream);
- } else {
- // emit 'readable' now to make sure it gets picked up.
- state.needReadable = false;
-
- if (!state.emittedReadable) {
- state.emittedReadable = true;
- emitReadable_(stream);
- }
- }
-} // Don't emit readable right away in sync mode, because this can trigger
-// another read() call => stack overflow. This way, it might trigger
-// a nextTick recursion warning, but that's not so bad.
-
-
-function emitReadable(stream) {
- var state = stream._readableState;
- debug('emitReadable', state.needReadable, state.emittedReadable);
- state.needReadable = false;
-
- if (!state.emittedReadable) {
- debug('emitReadable', state.flowing);
- state.emittedReadable = true;
- process.nextTick(emitReadable_, stream);
- }
-}
-
-function emitReadable_(stream) {
- var state = stream._readableState;
- debug('emitReadable_', state.destroyed, state.length, state.ended);
-
- if (!state.destroyed && (state.length || state.ended)) {
- stream.emit('readable');
- state.emittedReadable = false;
- } // The stream needs another readable event if
- // 1. It is not flowing, as the flow mechanism will take
- // care of it.
- // 2. It is not ended.
- // 3. It is below the highWaterMark, so we can schedule
- // another readable later.
-
-
- state.needReadable = !state.flowing && !state.ended && state.length <= state.highWaterMark;
- flow(stream);
-} // at this point, the user has presumably seen the 'readable' event,
-// and called read() to consume some data. that may have triggered
-// in turn another _read(n) call, in which case reading = true if
-// it's in progress.
-// However, if we're not ended, or reading, and the length < hwm,
-// then go ahead and try to read some more preemptively.
-
-
-function maybeReadMore(stream, state) {
- if (!state.readingMore) {
- state.readingMore = true;
- process.nextTick(maybeReadMore_, stream, state);
- }
-}
-
-function maybeReadMore_(stream, state) {
- // Attempt to read more data if we should.
- //
- // The conditions for reading more data are (one of):
- // - Not enough data buffered (state.length < state.highWaterMark). The loop
- // is responsible for filling the buffer with enough data if such data
- // is available. If highWaterMark is 0 and we are not in the flowing mode
- // we should _not_ attempt to buffer any extra data. We'll get more data
- // when the stream consumer calls read() instead.
- // - No data in the buffer, and the stream is in flowing mode. In this mode
- // the loop below is responsible for ensuring read() is called. Failing to
- // call read here would abort the flow and there's no other mechanism for
- // continuing the flow if the stream consumer has just subscribed to the
- // 'data' event.
- //
- // In addition to the above conditions to keep reading data, the following
- // conditions prevent the data from being read:
- // - The stream has ended (state.ended).
- // - There is already a pending 'read' operation (state.reading). This is a
- // case where the the stream has called the implementation defined _read()
- // method, but they are processing the call asynchronously and have _not_
- // called push() with new data. In this case we skip performing more
- // read()s. The execution ends in this method again after the _read() ends
- // up calling push() with more data.
- while (!state.reading && !state.ended && (state.length < state.highWaterMark || state.flowing && state.length === 0)) {
- var len = state.length;
- debug('maybeReadMore read 0');
- stream.read(0);
- if (len === state.length) // didn't get any data, stop spinning.
- break;
- }
-
- state.readingMore = false;
-} // abstract method. to be overridden in specific implementation classes.
-// call cb(er, data) where data is <= n in length.
-// for virtual (non-string, non-buffer) streams, "length" is somewhat
-// arbitrary, and perhaps not very meaningful.
-
-
-Readable.prototype._read = function (n) {
- errorOrDestroy(this, new ERR_METHOD_NOT_IMPLEMENTED('_read()'));
-};
-
-Readable.prototype.pipe = function (dest, pipeOpts) {
- var src = this;
- var state = this._readableState;
-
- switch (state.pipesCount) {
- case 0:
- state.pipes = dest;
- break;
-
- case 1:
- state.pipes = [state.pipes, dest];
- break;
-
- default:
- state.pipes.push(dest);
- break;
- }
-
- state.pipesCount += 1;
- debug('pipe count=%d opts=%j', state.pipesCount, pipeOpts);
- var doEnd = (!pipeOpts || pipeOpts.end !== false) && dest !== process.stdout && dest !== process.stderr;
- var endFn = doEnd ? onend : unpipe;
- if (state.endEmitted) process.nextTick(endFn);else src.once('end', endFn);
- dest.on('unpipe', onunpipe);
-
- function onunpipe(readable, unpipeInfo) {
- debug('onunpipe');
-
- if (readable === src) {
- if (unpipeInfo && unpipeInfo.hasUnpiped === false) {
- unpipeInfo.hasUnpiped = true;
- cleanup();
- }
- }
- }
-
- function onend() {
- debug('onend');
- dest.end();
- } // when the dest drains, it reduces the awaitDrain counter
- // on the source. This would be more elegant with a .once()
- // handler in flow(), but adding and removing repeatedly is
- // too slow.
-
-
- var ondrain = pipeOnDrain(src);
- dest.on('drain', ondrain);
- var cleanedUp = false;
-
- function cleanup() {
- debug('cleanup'); // cleanup event handlers once the pipe is broken
-
- dest.removeListener('close', onclose);
- dest.removeListener('finish', onfinish);
- dest.removeListener('drain', ondrain);
- dest.removeListener('error', onerror);
- dest.removeListener('unpipe', onunpipe);
- src.removeListener('end', onend);
- src.removeListener('end', unpipe);
- src.removeListener('data', ondata);
- cleanedUp = true; // if the reader is waiting for a drain event from this
- // specific writer, then it would cause it to never start
- // flowing again.
- // So, if this is awaiting a drain, then we just call it now.
- // If we don't know, then assume that we are waiting for one.
-
- if (state.awaitDrain && (!dest._writableState || dest._writableState.needDrain)) ondrain();
- }
-
- src.on('data', ondata);
-
- function ondata(chunk) {
- debug('ondata');
- var ret = dest.write(chunk);
- debug('dest.write', ret);
-
- if (ret === false) {
- // If the user unpiped during `dest.write()`, it is possible
- // to get stuck in a permanently paused state if that write
- // also returned false.
- // => Check whether `dest` is still a piping destination.
- if ((state.pipesCount === 1 && state.pipes === dest || state.pipesCount > 1 && indexOf(state.pipes, dest) !== -1) && !cleanedUp) {
- debug('false write response, pause', state.awaitDrain);
- state.awaitDrain++;
- }
-
- src.pause();
- }
- } // if the dest has an error, then stop piping into it.
- // however, don't suppress the throwing behavior for this.
-
-
- function onerror(er) {
- debug('onerror', er);
- unpipe();
- dest.removeListener('error', onerror);
- if (EElistenerCount(dest, 'error') === 0) errorOrDestroy(dest, er);
- } // Make sure our error handler is attached before userland ones.
-
-
- prependListener(dest, 'error', onerror); // Both close and finish should trigger unpipe, but only once.
-
- function onclose() {
- dest.removeListener('finish', onfinish);
- unpipe();
- }
-
- dest.once('close', onclose);
-
- function onfinish() {
- debug('onfinish');
- dest.removeListener('close', onclose);
- unpipe();
- }
-
- dest.once('finish', onfinish);
-
- function unpipe() {
- debug('unpipe');
- src.unpipe(dest);
- } // tell the dest that it's being piped to
-
-
- dest.emit('pipe', src); // start the flow if it hasn't been started already.
-
- if (!state.flowing) {
- debug('pipe resume');
- src.resume();
- }
-
- return dest;
-};
-
-function pipeOnDrain(src) {
- return function pipeOnDrainFunctionResult() {
- var state = src._readableState;
- debug('pipeOnDrain', state.awaitDrain);
- if (state.awaitDrain) state.awaitDrain--;
-
- if (state.awaitDrain === 0 && EElistenerCount(src, 'data')) {
- state.flowing = true;
- flow(src);
- }
- };
-}
-
-Readable.prototype.unpipe = function (dest) {
- var state = this._readableState;
- var unpipeInfo = {
- hasUnpiped: false
- }; // if we're not piping anywhere, then do nothing.
-
- if (state.pipesCount === 0) return this; // just one destination. most common case.
-
- if (state.pipesCount === 1) {
- // passed in one, but it's not the right one.
- if (dest && dest !== state.pipes) return this;
- if (!dest) dest = state.pipes; // got a match.
-
- state.pipes = null;
- state.pipesCount = 0;
- state.flowing = false;
- if (dest) dest.emit('unpipe', this, unpipeInfo);
- return this;
- } // slow case. multiple pipe destinations.
-
-
- if (!dest) {
- // remove all.
- var dests = state.pipes;
- var len = state.pipesCount;
- state.pipes = null;
- state.pipesCount = 0;
- state.flowing = false;
-
- for (var i = 0; i < len; i++) {
- dests[i].emit('unpipe', this, {
- hasUnpiped: false
- });
- }
-
- return this;
- } // try to find the right one.
-
-
- var index = indexOf(state.pipes, dest);
- if (index === -1) return this;
- state.pipes.splice(index, 1);
- state.pipesCount -= 1;
- if (state.pipesCount === 1) state.pipes = state.pipes[0];
- dest.emit('unpipe', this, unpipeInfo);
- return this;
-}; // set up data events if they are asked for
-// Ensure readable listeners eventually get something
-
-
-Readable.prototype.on = function (ev, fn) {
- var res = Stream.prototype.on.call(this, ev, fn);
- var state = this._readableState;
-
- if (ev === 'data') {
- // update readableListening so that resume() may be a no-op
- // a few lines down. This is needed to support once('readable').
- state.readableListening = this.listenerCount('readable') > 0; // Try start flowing on next tick if stream isn't explicitly paused
-
- if (state.flowing !== false) this.resume();
- } else if (ev === 'readable') {
- if (!state.endEmitted && !state.readableListening) {
- state.readableListening = state.needReadable = true;
- state.flowing = false;
- state.emittedReadable = false;
- debug('on readable', state.length, state.reading);
-
- if (state.length) {
- emitReadable(this);
- } else if (!state.reading) {
- process.nextTick(nReadingNextTick, this);
- }
- }
- }
-
- return res;
-};
-
-Readable.prototype.addListener = Readable.prototype.on;
-
-Readable.prototype.removeListener = function (ev, fn) {
- var res = Stream.prototype.removeListener.call(this, ev, fn);
-
- if (ev === 'readable') {
- // We need to check if there is someone still listening to
- // readable and reset the state. However this needs to happen
- // after readable has been emitted but before I/O (nextTick) to
- // support once('readable', fn) cycles. This means that calling
- // resume within the same tick will have no
- // effect.
- process.nextTick(updateReadableListening, this);
- }
-
- return res;
-};
-
-Readable.prototype.removeAllListeners = function (ev) {
- var res = Stream.prototype.removeAllListeners.apply(this, arguments);
-
- if (ev === 'readable' || ev === undefined) {
- // We need to check if there is someone still listening to
- // readable and reset the state. However this needs to happen
- // after readable has been emitted but before I/O (nextTick) to
- // support once('readable', fn) cycles. This means that calling
- // resume within the same tick will have no
- // effect.
- process.nextTick(updateReadableListening, this);
- }
-
- return res;
-};
-
-function updateReadableListening(self) {
- var state = self._readableState;
- state.readableListening = self.listenerCount('readable') > 0;
-
- if (state.resumeScheduled && !state.paused) {
- // flowing needs to be set to true now, otherwise
- // the upcoming resume will not flow.
- state.flowing = true; // crude way to check if we should resume
- } else if (self.listenerCount('data') > 0) {
- self.resume();
- }
-}
-
-function nReadingNextTick(self) {
- debug('readable nexttick read 0');
- self.read(0);
-} // pause() and resume() are remnants of the legacy readable stream API
-// If the user uses them, then switch into old mode.
-
-
-Readable.prototype.resume = function () {
- var state = this._readableState;
-
- if (!state.flowing) {
- debug('resume'); // we flow only if there is no one listening
- // for readable, but we still have to call
- // resume()
-
- state.flowing = !state.readableListening;
- resume(this, state);
- }
-
- state.paused = false;
- return this;
-};
-
-function resume(stream, state) {
- if (!state.resumeScheduled) {
- state.resumeScheduled = true;
- process.nextTick(resume_, stream, state);
- }
-}
-
-function resume_(stream, state) {
- debug('resume', state.reading);
-
- if (!state.reading) {
- stream.read(0);
- }
-
- state.resumeScheduled = false;
- stream.emit('resume');
- flow(stream);
- if (state.flowing && !state.reading) stream.read(0);
-}
-
-Readable.prototype.pause = function () {
- debug('call pause flowing=%j', this._readableState.flowing);
-
- if (this._readableState.flowing !== false) {
- debug('pause');
- this._readableState.flowing = false;
- this.emit('pause');
- }
-
- this._readableState.paused = true;
- return this;
-};
-
-function flow(stream) {
- var state = stream._readableState;
- debug('flow', state.flowing);
-
- while (state.flowing && stream.read() !== null) {
- ;
- }
-} // wrap an old-style stream as the async data source.
-// This is *not* part of the readable stream interface.
-// It is an ugly unfortunate mess of history.
-
-
-Readable.prototype.wrap = function (stream) {
- var _this = this;
-
- var state = this._readableState;
- var paused = false;
- stream.on('end', function () {
- debug('wrapped end');
-
- if (state.decoder && !state.ended) {
- var chunk = state.decoder.end();
- if (chunk && chunk.length) _this.push(chunk);
- }
-
- _this.push(null);
- });
- stream.on('data', function (chunk) {
- debug('wrapped data');
- if (state.decoder) chunk = state.decoder.write(chunk); // don't skip over falsy values in objectMode
-
- if (state.objectMode && (chunk === null || chunk === undefined)) return;else if (!state.objectMode && (!chunk || !chunk.length)) return;
-
- var ret = _this.push(chunk);
-
- if (!ret) {
- paused = true;
- stream.pause();
- }
- }); // proxy all the other methods.
- // important when wrapping filters and duplexes.
-
- for (var i in stream) {
- if (this[i] === undefined && typeof stream[i] === 'function') {
- this[i] = function methodWrap(method) {
- return function methodWrapReturnFunction() {
- return stream[method].apply(stream, arguments);
- };
- }(i);
- }
- } // proxy certain important events.
-
-
- for (var n = 0; n < kProxyEvents.length; n++) {
- stream.on(kProxyEvents[n], this.emit.bind(this, kProxyEvents[n]));
- } // when we try to consume some more bytes, simply unpause the
- // underlying stream.
-
-
- this._read = function (n) {
- debug('wrapped _read', n);
-
- if (paused) {
- paused = false;
- stream.resume();
- }
- };
-
- return this;
-};
-
-if (typeof Symbol === 'function') {
- Readable.prototype[Symbol.asyncIterator] = function () {
- if (createReadableStreamAsyncIterator === undefined) {
- createReadableStreamAsyncIterator = require('./internal/streams/async_iterator');
- }
-
- return createReadableStreamAsyncIterator(this);
- };
-}
-
-Object.defineProperty(Readable.prototype, 'readableHighWaterMark', {
- // making it explicit this property is not enumerable
- // because otherwise some prototype manipulation in
- // userland will fail
- enumerable: false,
- get: function get() {
- return this._readableState.highWaterMark;
- }
-});
-Object.defineProperty(Readable.prototype, 'readableBuffer', {
- // making it explicit this property is not enumerable
- // because otherwise some prototype manipulation in
- // userland will fail
- enumerable: false,
- get: function get() {
- return this._readableState && this._readableState.buffer;
- }
-});
-Object.defineProperty(Readable.prototype, 'readableFlowing', {
- // making it explicit this property is not enumerable
- // because otherwise some prototype manipulation in
- // userland will fail
- enumerable: false,
- get: function get() {
- return this._readableState.flowing;
- },
- set: function set(state) {
- if (this._readableState) {
- this._readableState.flowing = state;
- }
- }
-}); // exposed for testing purposes only.
-
-Readable._fromList = fromList;
-Object.defineProperty(Readable.prototype, 'readableLength', {
- // making it explicit this property is not enumerable
- // because otherwise some prototype manipulation in
- // userland will fail
- enumerable: false,
- get: function get() {
- return this._readableState.length;
- }
-}); // Pluck off n bytes from an array of buffers.
-// Length is the combined lengths of all the buffers in the list.
-// This function is designed to be inlinable, so please take care when making
-// changes to the function body.
-
-function fromList(n, state) {
- // nothing buffered
- if (state.length === 0) return null;
- var ret;
- if (state.objectMode) ret = state.buffer.shift();else if (!n || n >= state.length) {
- // read it all, truncate the list
- if (state.decoder) ret = state.buffer.join('');else if (state.buffer.length === 1) ret = state.buffer.first();else ret = state.buffer.concat(state.length);
- state.buffer.clear();
- } else {
- // read part of list
- ret = state.buffer.consume(n, state.decoder);
- }
- return ret;
-}
-
-function endReadable(stream) {
- var state = stream._readableState;
- debug('endReadable', state.endEmitted);
-
- if (!state.endEmitted) {
- state.ended = true;
- process.nextTick(endReadableNT, state, stream);
- }
-}
-
-function endReadableNT(state, stream) {
- debug('endReadableNT', state.endEmitted, state.length); // Check that we didn't get one last unshift.
-
- if (!state.endEmitted && state.length === 0) {
- state.endEmitted = true;
- stream.readable = false;
- stream.emit('end');
-
- if (state.autoDestroy) {
- // In case of duplex streams we need a way to detect
- // if the writable side is ready for autoDestroy as well
- var wState = stream._writableState;
-
- if (!wState || wState.autoDestroy && wState.finished) {
- stream.destroy();
- }
- }
- }
-}
-
-if (typeof Symbol === 'function') {
- Readable.from = function (iterable, opts) {
- if (from === undefined) {
- from = require('./internal/streams/from');
- }
-
- return from(Readable, iterable, opts);
- };
-}
-
-function indexOf(xs, x) {
- for (var i = 0, l = xs.length; i < l; i++) {
- if (xs[i] === x) return i;
- }
-
- return -1;
-}
\ No newline at end of file
projects / dotfiles / .git / blobdiff