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Direktori : /opt/alt/alt-nodejs12/root/lib/node_modules/npm/node_modules.bundled/from2/ |
Current File : //opt/alt/alt-nodejs12/root/lib/node_modules/npm/node_modules.bundled/from2/index.js |
var Readable = require('readable-stream').Readable var inherits = require('inherits') module.exports = from2 from2.ctor = ctor from2.obj = obj var Proto = ctor() function toFunction(list) { list = list.slice() return function (_, cb) { var err = null var item = list.length ? list.shift() : null if (item instanceof Error) { err = item item = null } cb(err, item) } } function from2(opts, read) { if (typeof opts !== 'object' || Array.isArray(opts)) { read = opts opts = {} } var rs = new Proto(opts) rs._from = Array.isArray(read) ? toFunction(read) : (read || noop) return rs } function ctor(opts, read) { if (typeof opts === 'function') { read = opts opts = {} } opts = defaults(opts) inherits(Class, Readable) function Class(override) { if (!(this instanceof Class)) return new Class(override) this._reading = false this._callback = check this.destroyed = false Readable.call(this, override || opts) var self = this var hwm = this._readableState.highWaterMark function check(err, data) { if (self.destroyed) return if (err) return self.destroy(err) if (data === null) return self.push(null) self._reading = false if (self.push(data)) self._read(hwm) } } Class.prototype._from = read || noop Class.prototype._read = function(size) { if (this._reading || this.destroyed) return this._reading = true this._from(size, this._callback) } Class.prototype.destroy = function(err) { if (this.destroyed) return this.destroyed = true var self = this process.nextTick(function() { if (err) self.emit('error', err) self.emit('close') }) } return Class } function obj(opts, read) { if (typeof opts === 'function' || Array.isArray(opts)) { read = opts opts = {} } opts = defaults(opts) opts.objectMode = true opts.highWaterMark = 16 return from2(opts, read) } function noop () {} function defaults(opts) { opts = opts || {} return opts }