mirror of https://github.com/jkjoy/sunpeiwen.git
650 lines
17 KiB
JavaScript
650 lines
17 KiB
JavaScript
'use strict'
|
|
const proc = typeof process === 'object' && process ? process : {
|
|
stdout: null,
|
|
stderr: null,
|
|
}
|
|
const EE = require('events')
|
|
const Stream = require('stream')
|
|
const SD = require('string_decoder').StringDecoder
|
|
|
|
const EOF = Symbol('EOF')
|
|
const MAYBE_EMIT_END = Symbol('maybeEmitEnd')
|
|
const EMITTED_END = Symbol('emittedEnd')
|
|
const EMITTING_END = Symbol('emittingEnd')
|
|
const EMITTED_ERROR = Symbol('emittedError')
|
|
const CLOSED = Symbol('closed')
|
|
const READ = Symbol('read')
|
|
const FLUSH = Symbol('flush')
|
|
const FLUSHCHUNK = Symbol('flushChunk')
|
|
const ENCODING = Symbol('encoding')
|
|
const DECODER = Symbol('decoder')
|
|
const FLOWING = Symbol('flowing')
|
|
const PAUSED = Symbol('paused')
|
|
const RESUME = Symbol('resume')
|
|
const BUFFERLENGTH = Symbol('bufferLength')
|
|
const BUFFERPUSH = Symbol('bufferPush')
|
|
const BUFFERSHIFT = Symbol('bufferShift')
|
|
const OBJECTMODE = Symbol('objectMode')
|
|
const DESTROYED = Symbol('destroyed')
|
|
const EMITDATA = Symbol('emitData')
|
|
const EMITEND = Symbol('emitEnd')
|
|
const EMITEND2 = Symbol('emitEnd2')
|
|
const ASYNC = Symbol('async')
|
|
|
|
const defer = fn => Promise.resolve().then(fn)
|
|
|
|
// TODO remove when Node v8 support drops
|
|
const doIter = global._MP_NO_ITERATOR_SYMBOLS_ !== '1'
|
|
const ASYNCITERATOR = doIter && Symbol.asyncIterator
|
|
|| Symbol('asyncIterator not implemented')
|
|
const ITERATOR = doIter && Symbol.iterator
|
|
|| Symbol('iterator not implemented')
|
|
|
|
// events that mean 'the stream is over'
|
|
// these are treated specially, and re-emitted
|
|
// if they are listened for after emitting.
|
|
const isEndish = ev =>
|
|
ev === 'end' ||
|
|
ev === 'finish' ||
|
|
ev === 'prefinish'
|
|
|
|
const isArrayBuffer = b => b instanceof ArrayBuffer ||
|
|
typeof b === 'object' &&
|
|
b.constructor &&
|
|
b.constructor.name === 'ArrayBuffer' &&
|
|
b.byteLength >= 0
|
|
|
|
const isArrayBufferView = b => !Buffer.isBuffer(b) && ArrayBuffer.isView(b)
|
|
|
|
class Pipe {
|
|
constructor (src, dest, opts) {
|
|
this.src = src
|
|
this.dest = dest
|
|
this.opts = opts
|
|
this.ondrain = () => src[RESUME]()
|
|
dest.on('drain', this.ondrain)
|
|
}
|
|
unpipe () {
|
|
this.dest.removeListener('drain', this.ondrain)
|
|
}
|
|
// istanbul ignore next - only here for the prototype
|
|
proxyErrors () {}
|
|
end () {
|
|
this.unpipe()
|
|
if (this.opts.end)
|
|
this.dest.end()
|
|
}
|
|
}
|
|
|
|
class PipeProxyErrors extends Pipe {
|
|
unpipe () {
|
|
this.src.removeListener('error', this.proxyErrors)
|
|
super.unpipe()
|
|
}
|
|
constructor (src, dest, opts) {
|
|
super(src, dest, opts)
|
|
this.proxyErrors = er => dest.emit('error', er)
|
|
src.on('error', this.proxyErrors)
|
|
}
|
|
}
|
|
|
|
module.exports = class Minipass extends Stream {
|
|
constructor (options) {
|
|
super()
|
|
this[FLOWING] = false
|
|
// whether we're explicitly paused
|
|
this[PAUSED] = false
|
|
this.pipes = []
|
|
this.buffer = []
|
|
this[OBJECTMODE] = options && options.objectMode || false
|
|
if (this[OBJECTMODE])
|
|
this[ENCODING] = null
|
|
else
|
|
this[ENCODING] = options && options.encoding || null
|
|
if (this[ENCODING] === 'buffer')
|
|
this[ENCODING] = null
|
|
this[ASYNC] = options && !!options.async || false
|
|
this[DECODER] = this[ENCODING] ? new SD(this[ENCODING]) : null
|
|
this[EOF] = false
|
|
this[EMITTED_END] = false
|
|
this[EMITTING_END] = false
|
|
this[CLOSED] = false
|
|
this[EMITTED_ERROR] = null
|
|
this.writable = true
|
|
this.readable = true
|
|
this[BUFFERLENGTH] = 0
|
|
this[DESTROYED] = false
|
|
}
|
|
|
|
get bufferLength () { return this[BUFFERLENGTH] }
|
|
|
|
get encoding () { return this[ENCODING] }
|
|
set encoding (enc) {
|
|
if (this[OBJECTMODE])
|
|
throw new Error('cannot set encoding in objectMode')
|
|
|
|
if (this[ENCODING] && enc !== this[ENCODING] &&
|
|
(this[DECODER] && this[DECODER].lastNeed || this[BUFFERLENGTH]))
|
|
throw new Error('cannot change encoding')
|
|
|
|
if (this[ENCODING] !== enc) {
|
|
this[DECODER] = enc ? new SD(enc) : null
|
|
if (this.buffer.length)
|
|
this.buffer = this.buffer.map(chunk => this[DECODER].write(chunk))
|
|
}
|
|
|
|
this[ENCODING] = enc
|
|
}
|
|
|
|
setEncoding (enc) {
|
|
this.encoding = enc
|
|
}
|
|
|
|
get objectMode () { return this[OBJECTMODE] }
|
|
set objectMode (om) { this[OBJECTMODE] = this[OBJECTMODE] || !!om }
|
|
|
|
get ['async'] () { return this[ASYNC] }
|
|
set ['async'] (a) { this[ASYNC] = this[ASYNC] || !!a }
|
|
|
|
write (chunk, encoding, cb) {
|
|
if (this[EOF])
|
|
throw new Error('write after end')
|
|
|
|
if (this[DESTROYED]) {
|
|
this.emit('error', Object.assign(
|
|
new Error('Cannot call write after a stream was destroyed'),
|
|
{ code: 'ERR_STREAM_DESTROYED' }
|
|
))
|
|
return true
|
|
}
|
|
|
|
if (typeof encoding === 'function')
|
|
cb = encoding, encoding = 'utf8'
|
|
|
|
if (!encoding)
|
|
encoding = 'utf8'
|
|
|
|
const fn = this[ASYNC] ? defer : f => f()
|
|
|
|
// convert array buffers and typed array views into buffers
|
|
// at some point in the future, we may want to do the opposite!
|
|
// leave strings and buffers as-is
|
|
// anything else switches us into object mode
|
|
if (!this[OBJECTMODE] && !Buffer.isBuffer(chunk)) {
|
|
if (isArrayBufferView(chunk))
|
|
chunk = Buffer.from(chunk.buffer, chunk.byteOffset, chunk.byteLength)
|
|
else if (isArrayBuffer(chunk))
|
|
chunk = Buffer.from(chunk)
|
|
else if (typeof chunk !== 'string')
|
|
// use the setter so we throw if we have encoding set
|
|
this.objectMode = true
|
|
}
|
|
|
|
// handle object mode up front, since it's simpler
|
|
// this yields better performance, fewer checks later.
|
|
if (this[OBJECTMODE]) {
|
|
/* istanbul ignore if - maybe impossible? */
|
|
if (this.flowing && this[BUFFERLENGTH] !== 0)
|
|
this[FLUSH](true)
|
|
|
|
if (this.flowing)
|
|
this.emit('data', chunk)
|
|
else
|
|
this[BUFFERPUSH](chunk)
|
|
|
|
if (this[BUFFERLENGTH] !== 0)
|
|
this.emit('readable')
|
|
|
|
if (cb)
|
|
fn(cb)
|
|
|
|
return this.flowing
|
|
}
|
|
|
|
// at this point the chunk is a buffer or string
|
|
// don't buffer it up or send it to the decoder
|
|
if (!chunk.length) {
|
|
if (this[BUFFERLENGTH] !== 0)
|
|
this.emit('readable')
|
|
if (cb)
|
|
fn(cb)
|
|
return this.flowing
|
|
}
|
|
|
|
// fast-path writing strings of same encoding to a stream with
|
|
// an empty buffer, skipping the buffer/decoder dance
|
|
if (typeof chunk === 'string' &&
|
|
// unless it is a string already ready for us to use
|
|
!(encoding === this[ENCODING] && !this[DECODER].lastNeed)) {
|
|
chunk = Buffer.from(chunk, encoding)
|
|
}
|
|
|
|
if (Buffer.isBuffer(chunk) && this[ENCODING])
|
|
chunk = this[DECODER].write(chunk)
|
|
|
|
// Note: flushing CAN potentially switch us into not-flowing mode
|
|
if (this.flowing && this[BUFFERLENGTH] !== 0)
|
|
this[FLUSH](true)
|
|
|
|
if (this.flowing)
|
|
this.emit('data', chunk)
|
|
else
|
|
this[BUFFERPUSH](chunk)
|
|
|
|
if (this[BUFFERLENGTH] !== 0)
|
|
this.emit('readable')
|
|
|
|
if (cb)
|
|
fn(cb)
|
|
|
|
return this.flowing
|
|
}
|
|
|
|
read (n) {
|
|
if (this[DESTROYED])
|
|
return null
|
|
|
|
if (this[BUFFERLENGTH] === 0 || n === 0 || n > this[BUFFERLENGTH]) {
|
|
this[MAYBE_EMIT_END]()
|
|
return null
|
|
}
|
|
|
|
if (this[OBJECTMODE])
|
|
n = null
|
|
|
|
if (this.buffer.length > 1 && !this[OBJECTMODE]) {
|
|
if (this.encoding)
|
|
this.buffer = [this.buffer.join('')]
|
|
else
|
|
this.buffer = [Buffer.concat(this.buffer, this[BUFFERLENGTH])]
|
|
}
|
|
|
|
const ret = this[READ](n || null, this.buffer[0])
|
|
this[MAYBE_EMIT_END]()
|
|
return ret
|
|
}
|
|
|
|
[READ] (n, chunk) {
|
|
if (n === chunk.length || n === null)
|
|
this[BUFFERSHIFT]()
|
|
else {
|
|
this.buffer[0] = chunk.slice(n)
|
|
chunk = chunk.slice(0, n)
|
|
this[BUFFERLENGTH] -= n
|
|
}
|
|
|
|
this.emit('data', chunk)
|
|
|
|
if (!this.buffer.length && !this[EOF])
|
|
this.emit('drain')
|
|
|
|
return chunk
|
|
}
|
|
|
|
end (chunk, encoding, cb) {
|
|
if (typeof chunk === 'function')
|
|
cb = chunk, chunk = null
|
|
if (typeof encoding === 'function')
|
|
cb = encoding, encoding = 'utf8'
|
|
if (chunk)
|
|
this.write(chunk, encoding)
|
|
if (cb)
|
|
this.once('end', cb)
|
|
this[EOF] = true
|
|
this.writable = false
|
|
|
|
// if we haven't written anything, then go ahead and emit,
|
|
// even if we're not reading.
|
|
// we'll re-emit if a new 'end' listener is added anyway.
|
|
// This makes MP more suitable to write-only use cases.
|
|
if (this.flowing || !this[PAUSED])
|
|
this[MAYBE_EMIT_END]()
|
|
return this
|
|
}
|
|
|
|
// don't let the internal resume be overwritten
|
|
[RESUME] () {
|
|
if (this[DESTROYED])
|
|
return
|
|
|
|
this[PAUSED] = false
|
|
this[FLOWING] = true
|
|
this.emit('resume')
|
|
if (this.buffer.length)
|
|
this[FLUSH]()
|
|
else if (this[EOF])
|
|
this[MAYBE_EMIT_END]()
|
|
else
|
|
this.emit('drain')
|
|
}
|
|
|
|
resume () {
|
|
return this[RESUME]()
|
|
}
|
|
|
|
pause () {
|
|
this[FLOWING] = false
|
|
this[PAUSED] = true
|
|
}
|
|
|
|
get destroyed () {
|
|
return this[DESTROYED]
|
|
}
|
|
|
|
get flowing () {
|
|
return this[FLOWING]
|
|
}
|
|
|
|
get paused () {
|
|
return this[PAUSED]
|
|
}
|
|
|
|
[BUFFERPUSH] (chunk) {
|
|
if (this[OBJECTMODE])
|
|
this[BUFFERLENGTH] += 1
|
|
else
|
|
this[BUFFERLENGTH] += chunk.length
|
|
this.buffer.push(chunk)
|
|
}
|
|
|
|
[BUFFERSHIFT] () {
|
|
if (this.buffer.length) {
|
|
if (this[OBJECTMODE])
|
|
this[BUFFERLENGTH] -= 1
|
|
else
|
|
this[BUFFERLENGTH] -= this.buffer[0].length
|
|
}
|
|
return this.buffer.shift()
|
|
}
|
|
|
|
[FLUSH] (noDrain) {
|
|
do {} while (this[FLUSHCHUNK](this[BUFFERSHIFT]()))
|
|
|
|
if (!noDrain && !this.buffer.length && !this[EOF])
|
|
this.emit('drain')
|
|
}
|
|
|
|
[FLUSHCHUNK] (chunk) {
|
|
return chunk ? (this.emit('data', chunk), this.flowing) : false
|
|
}
|
|
|
|
pipe (dest, opts) {
|
|
if (this[DESTROYED])
|
|
return
|
|
|
|
const ended = this[EMITTED_END]
|
|
opts = opts || {}
|
|
if (dest === proc.stdout || dest === proc.stderr)
|
|
opts.end = false
|
|
else
|
|
opts.end = opts.end !== false
|
|
opts.proxyErrors = !!opts.proxyErrors
|
|
|
|
// piping an ended stream ends immediately
|
|
if (ended) {
|
|
if (opts.end)
|
|
dest.end()
|
|
} else {
|
|
this.pipes.push(!opts.proxyErrors ? new Pipe(this, dest, opts)
|
|
: new PipeProxyErrors(this, dest, opts))
|
|
if (this[ASYNC])
|
|
defer(() => this[RESUME]())
|
|
else
|
|
this[RESUME]()
|
|
}
|
|
|
|
return dest
|
|
}
|
|
|
|
unpipe (dest) {
|
|
const p = this.pipes.find(p => p.dest === dest)
|
|
if (p) {
|
|
this.pipes.splice(this.pipes.indexOf(p), 1)
|
|
p.unpipe()
|
|
}
|
|
}
|
|
|
|
addListener (ev, fn) {
|
|
return this.on(ev, fn)
|
|
}
|
|
|
|
on (ev, fn) {
|
|
const ret = super.on(ev, fn)
|
|
if (ev === 'data' && !this.pipes.length && !this.flowing)
|
|
this[RESUME]()
|
|
else if (ev === 'readable' && this[BUFFERLENGTH] !== 0)
|
|
super.emit('readable')
|
|
else if (isEndish(ev) && this[EMITTED_END]) {
|
|
super.emit(ev)
|
|
this.removeAllListeners(ev)
|
|
} else if (ev === 'error' && this[EMITTED_ERROR]) {
|
|
if (this[ASYNC])
|
|
defer(() => fn.call(this, this[EMITTED_ERROR]))
|
|
else
|
|
fn.call(this, this[EMITTED_ERROR])
|
|
}
|
|
return ret
|
|
}
|
|
|
|
get emittedEnd () {
|
|
return this[EMITTED_END]
|
|
}
|
|
|
|
[MAYBE_EMIT_END] () {
|
|
if (!this[EMITTING_END] &&
|
|
!this[EMITTED_END] &&
|
|
!this[DESTROYED] &&
|
|
this.buffer.length === 0 &&
|
|
this[EOF]) {
|
|
this[EMITTING_END] = true
|
|
this.emit('end')
|
|
this.emit('prefinish')
|
|
this.emit('finish')
|
|
if (this[CLOSED])
|
|
this.emit('close')
|
|
this[EMITTING_END] = false
|
|
}
|
|
}
|
|
|
|
emit (ev, data, ...extra) {
|
|
// error and close are only events allowed after calling destroy()
|
|
if (ev !== 'error' && ev !== 'close' && ev !== DESTROYED && this[DESTROYED])
|
|
return
|
|
else if (ev === 'data') {
|
|
return !data ? false
|
|
: this[ASYNC] ? defer(() => this[EMITDATA](data))
|
|
: this[EMITDATA](data)
|
|
} else if (ev === 'end') {
|
|
return this[EMITEND]()
|
|
} else if (ev === 'close') {
|
|
this[CLOSED] = true
|
|
// don't emit close before 'end' and 'finish'
|
|
if (!this[EMITTED_END] && !this[DESTROYED])
|
|
return
|
|
const ret = super.emit('close')
|
|
this.removeAllListeners('close')
|
|
return ret
|
|
} else if (ev === 'error') {
|
|
this[EMITTED_ERROR] = data
|
|
const ret = super.emit('error', data)
|
|
this[MAYBE_EMIT_END]()
|
|
return ret
|
|
} else if (ev === 'resume') {
|
|
const ret = super.emit('resume')
|
|
this[MAYBE_EMIT_END]()
|
|
return ret
|
|
} else if (ev === 'finish' || ev === 'prefinish') {
|
|
const ret = super.emit(ev)
|
|
this.removeAllListeners(ev)
|
|
return ret
|
|
}
|
|
|
|
// Some other unknown event
|
|
const ret = super.emit(ev, data, ...extra)
|
|
this[MAYBE_EMIT_END]()
|
|
return ret
|
|
}
|
|
|
|
[EMITDATA] (data) {
|
|
for (const p of this.pipes) {
|
|
if (p.dest.write(data) === false)
|
|
this.pause()
|
|
}
|
|
const ret = super.emit('data', data)
|
|
this[MAYBE_EMIT_END]()
|
|
return ret
|
|
}
|
|
|
|
[EMITEND] () {
|
|
if (this[EMITTED_END])
|
|
return
|
|
|
|
this[EMITTED_END] = true
|
|
this.readable = false
|
|
if (this[ASYNC])
|
|
defer(() => this[EMITEND2]())
|
|
else
|
|
this[EMITEND2]()
|
|
}
|
|
|
|
[EMITEND2] () {
|
|
if (this[DECODER]) {
|
|
const data = this[DECODER].end()
|
|
if (data) {
|
|
for (const p of this.pipes) {
|
|
p.dest.write(data)
|
|
}
|
|
super.emit('data', data)
|
|
}
|
|
}
|
|
|
|
for (const p of this.pipes) {
|
|
p.end()
|
|
}
|
|
const ret = super.emit('end')
|
|
this.removeAllListeners('end')
|
|
return ret
|
|
}
|
|
|
|
// const all = await stream.collect()
|
|
collect () {
|
|
const buf = []
|
|
if (!this[OBJECTMODE])
|
|
buf.dataLength = 0
|
|
// set the promise first, in case an error is raised
|
|
// by triggering the flow here.
|
|
const p = this.promise()
|
|
this.on('data', c => {
|
|
buf.push(c)
|
|
if (!this[OBJECTMODE])
|
|
buf.dataLength += c.length
|
|
})
|
|
return p.then(() => buf)
|
|
}
|
|
|
|
// const data = await stream.concat()
|
|
concat () {
|
|
return this[OBJECTMODE]
|
|
? Promise.reject(new Error('cannot concat in objectMode'))
|
|
: this.collect().then(buf =>
|
|
this[OBJECTMODE]
|
|
? Promise.reject(new Error('cannot concat in objectMode'))
|
|
: this[ENCODING] ? buf.join('') : Buffer.concat(buf, buf.dataLength))
|
|
}
|
|
|
|
// stream.promise().then(() => done, er => emitted error)
|
|
promise () {
|
|
return new Promise((resolve, reject) => {
|
|
this.on(DESTROYED, () => reject(new Error('stream destroyed')))
|
|
this.on('error', er => reject(er))
|
|
this.on('end', () => resolve())
|
|
})
|
|
}
|
|
|
|
// for await (let chunk of stream)
|
|
[ASYNCITERATOR] () {
|
|
const next = () => {
|
|
const res = this.read()
|
|
if (res !== null)
|
|
return Promise.resolve({ done: false, value: res })
|
|
|
|
if (this[EOF])
|
|
return Promise.resolve({ done: true })
|
|
|
|
let resolve = null
|
|
let reject = null
|
|
const onerr = er => {
|
|
this.removeListener('data', ondata)
|
|
this.removeListener('end', onend)
|
|
reject(er)
|
|
}
|
|
const ondata = value => {
|
|
this.removeListener('error', onerr)
|
|
this.removeListener('end', onend)
|
|
this.pause()
|
|
resolve({ value: value, done: !!this[EOF] })
|
|
}
|
|
const onend = () => {
|
|
this.removeListener('error', onerr)
|
|
this.removeListener('data', ondata)
|
|
resolve({ done: true })
|
|
}
|
|
const ondestroy = () => onerr(new Error('stream destroyed'))
|
|
return new Promise((res, rej) => {
|
|
reject = rej
|
|
resolve = res
|
|
this.once(DESTROYED, ondestroy)
|
|
this.once('error', onerr)
|
|
this.once('end', onend)
|
|
this.once('data', ondata)
|
|
})
|
|
}
|
|
|
|
return { next }
|
|
}
|
|
|
|
// for (let chunk of stream)
|
|
[ITERATOR] () {
|
|
const next = () => {
|
|
const value = this.read()
|
|
const done = value === null
|
|
return { value, done }
|
|
}
|
|
return { next }
|
|
}
|
|
|
|
destroy (er) {
|
|
if (this[DESTROYED]) {
|
|
if (er)
|
|
this.emit('error', er)
|
|
else
|
|
this.emit(DESTROYED)
|
|
return this
|
|
}
|
|
|
|
this[DESTROYED] = true
|
|
|
|
// throw away all buffered data, it's never coming out
|
|
this.buffer.length = 0
|
|
this[BUFFERLENGTH] = 0
|
|
|
|
if (typeof this.close === 'function' && !this[CLOSED])
|
|
this.close()
|
|
|
|
if (er)
|
|
this.emit('error', er)
|
|
else // if no error to emit, still reject pending promises
|
|
this.emit(DESTROYED)
|
|
|
|
return this
|
|
}
|
|
|
|
static isStream (s) {
|
|
return !!s && (s instanceof Minipass || s instanceof Stream ||
|
|
s instanceof EE && (
|
|
typeof s.pipe === 'function' || // readable
|
|
(typeof s.write === 'function' && typeof s.end === 'function') // writable
|
|
))
|
|
}
|
|
}
|