add hw2
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nik
327
node_modules/readable-stream/lib/internal/streams/utils.js
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vendored
Normal file
327
node_modules/readable-stream/lib/internal/streams/utils.js
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'use strict'
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const { SymbolAsyncIterator, SymbolIterator, SymbolFor } = require('../../ours/primordials')
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// We need to use SymbolFor to make these globally available
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// for interopt with readable-stream, i.e. readable-stream
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// and node core needs to be able to read/write private state
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// from each other for proper interoperability.
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const kIsDestroyed = SymbolFor('nodejs.stream.destroyed')
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const kIsErrored = SymbolFor('nodejs.stream.errored')
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const kIsReadable = SymbolFor('nodejs.stream.readable')
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const kIsWritable = SymbolFor('nodejs.stream.writable')
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const kIsDisturbed = SymbolFor('nodejs.stream.disturbed')
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const kIsClosedPromise = SymbolFor('nodejs.webstream.isClosedPromise')
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const kControllerErrorFunction = SymbolFor('nodejs.webstream.controllerErrorFunction')
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function isReadableNodeStream(obj, strict = false) {
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var _obj$_readableState
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return !!(
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(
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obj &&
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typeof obj.pipe === 'function' &&
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typeof obj.on === 'function' &&
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(!strict || (typeof obj.pause === 'function' && typeof obj.resume === 'function')) &&
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(!obj._writableState ||
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((_obj$_readableState = obj._readableState) === null || _obj$_readableState === undefined
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? undefined
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: _obj$_readableState.readable) !== false) &&
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// Duplex
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(!obj._writableState || obj._readableState)
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) // Writable has .pipe.
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)
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}
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function isWritableNodeStream(obj) {
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var _obj$_writableState
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return !!(
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(
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obj &&
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typeof obj.write === 'function' &&
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typeof obj.on === 'function' &&
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(!obj._readableState ||
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((_obj$_writableState = obj._writableState) === null || _obj$_writableState === undefined
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? undefined
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: _obj$_writableState.writable) !== false)
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) // Duplex
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)
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}
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function isDuplexNodeStream(obj) {
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return !!(
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obj &&
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typeof obj.pipe === 'function' &&
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obj._readableState &&
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typeof obj.on === 'function' &&
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typeof obj.write === 'function'
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)
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}
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function isNodeStream(obj) {
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return (
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obj &&
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(obj._readableState ||
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obj._writableState ||
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(typeof obj.write === 'function' && typeof obj.on === 'function') ||
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(typeof obj.pipe === 'function' && typeof obj.on === 'function'))
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)
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}
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function isReadableStream(obj) {
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return !!(
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obj &&
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!isNodeStream(obj) &&
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typeof obj.pipeThrough === 'function' &&
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typeof obj.getReader === 'function' &&
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typeof obj.cancel === 'function'
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)
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}
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function isWritableStream(obj) {
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return !!(obj && !isNodeStream(obj) && typeof obj.getWriter === 'function' && typeof obj.abort === 'function')
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}
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function isTransformStream(obj) {
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return !!(obj && !isNodeStream(obj) && typeof obj.readable === 'object' && typeof obj.writable === 'object')
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}
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function isWebStream(obj) {
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return isReadableStream(obj) || isWritableStream(obj) || isTransformStream(obj)
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}
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function isIterable(obj, isAsync) {
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if (obj == null) return false
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if (isAsync === true) return typeof obj[SymbolAsyncIterator] === 'function'
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if (isAsync === false) return typeof obj[SymbolIterator] === 'function'
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return typeof obj[SymbolAsyncIterator] === 'function' || typeof obj[SymbolIterator] === 'function'
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}
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function isDestroyed(stream) {
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if (!isNodeStream(stream)) return null
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const wState = stream._writableState
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const rState = stream._readableState
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const state = wState || rState
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return !!(stream.destroyed || stream[kIsDestroyed] || (state !== null && state !== undefined && state.destroyed))
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}
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// Have been end():d.
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function isWritableEnded(stream) {
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if (!isWritableNodeStream(stream)) return null
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if (stream.writableEnded === true) return true
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const wState = stream._writableState
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if (wState !== null && wState !== undefined && wState.errored) return false
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if (typeof (wState === null || wState === undefined ? undefined : wState.ended) !== 'boolean') return null
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return wState.ended
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}
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// Have emitted 'finish'.
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function isWritableFinished(stream, strict) {
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if (!isWritableNodeStream(stream)) return null
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if (stream.writableFinished === true) return true
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const wState = stream._writableState
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if (wState !== null && wState !== undefined && wState.errored) return false
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if (typeof (wState === null || wState === undefined ? undefined : wState.finished) !== 'boolean') return null
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return !!(wState.finished || (strict === false && wState.ended === true && wState.length === 0))
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}
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// Have been push(null):d.
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function isReadableEnded(stream) {
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if (!isReadableNodeStream(stream)) return null
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if (stream.readableEnded === true) return true
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const rState = stream._readableState
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if (!rState || rState.errored) return false
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if (typeof (rState === null || rState === undefined ? undefined : rState.ended) !== 'boolean') return null
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return rState.ended
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}
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// Have emitted 'end'.
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function isReadableFinished(stream, strict) {
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if (!isReadableNodeStream(stream)) return null
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const rState = stream._readableState
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if (rState !== null && rState !== undefined && rState.errored) return false
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if (typeof (rState === null || rState === undefined ? undefined : rState.endEmitted) !== 'boolean') return null
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return !!(rState.endEmitted || (strict === false && rState.ended === true && rState.length === 0))
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}
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function isReadable(stream) {
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if (stream && stream[kIsReadable] != null) return stream[kIsReadable]
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if (typeof (stream === null || stream === undefined ? undefined : stream.readable) !== 'boolean') return null
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if (isDestroyed(stream)) return false
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return isReadableNodeStream(stream) && stream.readable && !isReadableFinished(stream)
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}
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function isWritable(stream) {
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if (stream && stream[kIsWritable] != null) return stream[kIsWritable]
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if (typeof (stream === null || stream === undefined ? undefined : stream.writable) !== 'boolean') return null
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if (isDestroyed(stream)) return false
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return isWritableNodeStream(stream) && stream.writable && !isWritableEnded(stream)
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}
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function isFinished(stream, opts) {
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if (!isNodeStream(stream)) {
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return null
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}
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if (isDestroyed(stream)) {
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return true
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}
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if ((opts === null || opts === undefined ? undefined : opts.readable) !== false && isReadable(stream)) {
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return false
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}
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if ((opts === null || opts === undefined ? undefined : opts.writable) !== false && isWritable(stream)) {
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return false
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}
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return true
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}
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function isWritableErrored(stream) {
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var _stream$_writableStat, _stream$_writableStat2
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if (!isNodeStream(stream)) {
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return null
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}
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if (stream.writableErrored) {
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return stream.writableErrored
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}
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return (_stream$_writableStat =
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(_stream$_writableStat2 = stream._writableState) === null || _stream$_writableStat2 === undefined
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? undefined
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: _stream$_writableStat2.errored) !== null && _stream$_writableStat !== undefined
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? _stream$_writableStat
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: null
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}
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function isReadableErrored(stream) {
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var _stream$_readableStat, _stream$_readableStat2
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if (!isNodeStream(stream)) {
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return null
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}
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if (stream.readableErrored) {
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return stream.readableErrored
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}
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return (_stream$_readableStat =
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(_stream$_readableStat2 = stream._readableState) === null || _stream$_readableStat2 === undefined
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? undefined
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: _stream$_readableStat2.errored) !== null && _stream$_readableStat !== undefined
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? _stream$_readableStat
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: null
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}
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function isClosed(stream) {
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if (!isNodeStream(stream)) {
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return null
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}
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if (typeof stream.closed === 'boolean') {
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return stream.closed
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}
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const wState = stream._writableState
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const rState = stream._readableState
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if (
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typeof (wState === null || wState === undefined ? undefined : wState.closed) === 'boolean' ||
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typeof (rState === null || rState === undefined ? undefined : rState.closed) === 'boolean'
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) {
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return (
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(wState === null || wState === undefined ? undefined : wState.closed) ||
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(rState === null || rState === undefined ? undefined : rState.closed)
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)
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}
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if (typeof stream._closed === 'boolean' && isOutgoingMessage(stream)) {
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return stream._closed
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}
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return null
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}
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function isOutgoingMessage(stream) {
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return (
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typeof stream._closed === 'boolean' &&
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typeof stream._defaultKeepAlive === 'boolean' &&
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typeof stream._removedConnection === 'boolean' &&
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typeof stream._removedContLen === 'boolean'
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)
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}
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function isServerResponse(stream) {
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return typeof stream._sent100 === 'boolean' && isOutgoingMessage(stream)
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}
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function isServerRequest(stream) {
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var _stream$req
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return (
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typeof stream._consuming === 'boolean' &&
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typeof stream._dumped === 'boolean' &&
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((_stream$req = stream.req) === null || _stream$req === undefined ? undefined : _stream$req.upgradeOrConnect) ===
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undefined
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)
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}
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function willEmitClose(stream) {
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if (!isNodeStream(stream)) return null
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const wState = stream._writableState
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const rState = stream._readableState
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const state = wState || rState
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return (
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(!state && isServerResponse(stream)) || !!(state && state.autoDestroy && state.emitClose && state.closed === false)
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)
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}
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function isDisturbed(stream) {
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var _stream$kIsDisturbed
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return !!(
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stream &&
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((_stream$kIsDisturbed = stream[kIsDisturbed]) !== null && _stream$kIsDisturbed !== undefined
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? _stream$kIsDisturbed
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: stream.readableDidRead || stream.readableAborted)
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)
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}
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function isErrored(stream) {
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var _ref,
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_ref2,
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_ref3,
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_ref4,
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_ref5,
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_stream$kIsErrored,
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_stream$_readableStat3,
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_stream$_writableStat3,
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_stream$_readableStat4,
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_stream$_writableStat4
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return !!(
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stream &&
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((_ref =
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(_ref2 =
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(_ref3 =
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(_ref4 =
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(_ref5 =
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(_stream$kIsErrored = stream[kIsErrored]) !== null && _stream$kIsErrored !== undefined
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? _stream$kIsErrored
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: stream.readableErrored) !== null && _ref5 !== undefined
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? _ref5
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: stream.writableErrored) !== null && _ref4 !== undefined
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? _ref4
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: (_stream$_readableStat3 = stream._readableState) === null || _stream$_readableStat3 === undefined
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? undefined
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: _stream$_readableStat3.errorEmitted) !== null && _ref3 !== undefined
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? _ref3
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: (_stream$_writableStat3 = stream._writableState) === null || _stream$_writableStat3 === undefined
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? undefined
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: _stream$_writableStat3.errorEmitted) !== null && _ref2 !== undefined
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? _ref2
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: (_stream$_readableStat4 = stream._readableState) === null || _stream$_readableStat4 === undefined
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? undefined
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: _stream$_readableStat4.errored) !== null && _ref !== undefined
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? _ref
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: (_stream$_writableStat4 = stream._writableState) === null || _stream$_writableStat4 === undefined
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? undefined
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: _stream$_writableStat4.errored)
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)
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}
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module.exports = {
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isDestroyed,
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kIsDestroyed,
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isDisturbed,
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kIsDisturbed,
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isErrored,
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kIsErrored,
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isReadable,
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kIsReadable,
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kIsClosedPromise,
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kControllerErrorFunction,
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kIsWritable,
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isClosed,
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isDuplexNodeStream,
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isFinished,
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isIterable,
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isReadableNodeStream,
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isReadableStream,
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isReadableEnded,
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isReadableFinished,
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isReadableErrored,
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isNodeStream,
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isWebStream,
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isWritable,
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isWritableNodeStream,
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isWritableStream,
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isWritableEnded,
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isWritableFinished,
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isWritableErrored,
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isServerRequest,
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isServerResponse,
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willEmitClose,
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isTransformStream
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}
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