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20 |
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21 | 'use strict';
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22 |
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23 | module.exports = Readable;
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24 |
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25 |
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26 | var Duplex;
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27 |
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28 |
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29 | Readable.ReadableState = ReadableState;
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30 |
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31 |
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32 | var EE = require('events').EventEmitter;
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33 |
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34 | var EElistenerCount = function EElistenerCount(emitter, type) {
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35 | return emitter.listeners(type).length;
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36 | };
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37 |
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38 |
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39 |
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40 |
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41 |
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42 | var Stream = require('./internal/streams/stream');
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43 |
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44 |
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45 |
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46 | var Buffer = require('buffer').Buffer;
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47 |
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48 | var OurUint8Array = global.Uint8Array || function () {};
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49 |
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50 | function _uint8ArrayToBuffer(chunk) {
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51 | return Buffer.from(chunk);
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52 | }
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53 |
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54 | function _isUint8Array(obj) {
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55 | return Buffer.isBuffer(obj) || obj instanceof OurUint8Array;
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56 | }
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57 |
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58 |
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59 |
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60 | var debugUtil = require('util');
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61 |
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62 | var debug;
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63 |
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64 | if (debugUtil && debugUtil.debuglog) {
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65 | debug = debugUtil.debuglog('stream');
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66 | } else {
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67 | debug = function debug() {};
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68 | }
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69 |
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70 |
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71 |
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72 | var BufferList = require('./internal/streams/buffer_list');
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73 |
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74 | var destroyImpl = require('./internal/streams/destroy');
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75 |
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76 | var _require = require('./internal/streams/state'),
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77 | getHighWaterMark = _require.getHighWaterMark;
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78 |
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79 | var _require$codes = require('../errors').codes,
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80 | ERR_INVALID_ARG_TYPE = _require$codes.ERR_INVALID_ARG_TYPE,
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81 | ERR_STREAM_PUSH_AFTER_EOF = _require$codes.ERR_STREAM_PUSH_AFTER_EOF,
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82 | ERR_METHOD_NOT_IMPLEMENTED = _require$codes.ERR_METHOD_NOT_IMPLEMENTED,
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83 | ERR_STREAM_UNSHIFT_AFTER_END_EVENT = _require$codes.ERR_STREAM_UNSHIFT_AFTER_END_EVENT;
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84 |
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85 |
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86 | var StringDecoder;
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87 | var createReadableStreamAsyncIterator;
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88 | var from;
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89 |
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90 | require('inherits')(Readable, Stream);
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91 |
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92 | var errorOrDestroy = destroyImpl.errorOrDestroy;
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93 | var kProxyEvents = ['error', 'close', 'destroy', 'pause', 'resume'];
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94 |
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95 | function prependListener(emitter, event, fn) {
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96 |
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97 |
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98 | if (typeof emitter.prependListener === 'function') return emitter.prependListener(event, fn);
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99 |
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100 |
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101 |
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102 |
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103 | 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]];
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104 | }
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105 |
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106 | function ReadableState(options, stream, isDuplex) {
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107 | Duplex = Duplex || require('./_stream_duplex');
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108 | options = options || {};
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109 |
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110 |
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111 |
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112 |
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113 |
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114 | if (typeof isDuplex !== 'boolean') isDuplex = stream instanceof Duplex;
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115 |
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116 |
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117 | this.objectMode = !!options.objectMode;
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118 | if (isDuplex) this.objectMode = this.objectMode || !!options.readableObjectMode;
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119 |
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120 |
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121 | this.highWaterMark = getHighWaterMark(this, options, 'readableHighWaterMark', isDuplex);
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122 |
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123 |
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124 |
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125 | this.buffer = new BufferList();
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126 | this.length = 0;
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127 | this.pipes = null;
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128 | this.pipesCount = 0;
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129 | this.flowing = null;
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130 | this.ended = false;
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131 | this.endEmitted = false;
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132 | this.reading = false;
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133 |
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134 |
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135 |
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136 |
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137 | this.sync = true;
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138 |
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139 |
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140 | this.needReadable = false;
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141 | this.emittedReadable = false;
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142 | this.readableListening = false;
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143 | this.resumeScheduled = false;
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144 | this.paused = true;
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145 |
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146 | this.emitClose = options.emitClose !== false;
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147 |
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148 | this.autoDestroy = !!options.autoDestroy;
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149 |
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150 | this.destroyed = false;
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151 |
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152 |
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153 |
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154 | this.defaultEncoding = options.defaultEncoding || 'utf8';
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155 |
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156 | this.awaitDrain = 0;
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157 |
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158 | this.readingMore = false;
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159 | this.decoder = null;
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160 | this.encoding = null;
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161 |
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162 | if (options.encoding) {
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163 | if (!StringDecoder) StringDecoder = require('string_decoder/').StringDecoder;
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164 | this.decoder = new StringDecoder(options.encoding);
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165 | this.encoding = options.encoding;
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166 | }
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167 | }
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168 |
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169 | function Readable(options) {
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170 | Duplex = Duplex || require('./_stream_duplex');
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171 | if (!(this instanceof Readable)) return new Readable(options);
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172 |
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173 |
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174 | var isDuplex = this instanceof Duplex;
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175 | this._readableState = new ReadableState(options, this, isDuplex);
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176 |
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177 | this.readable = true;
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178 |
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179 | if (options) {
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180 | if (typeof options.read === 'function') this._read = options.read;
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181 | if (typeof options.destroy === 'function') this._destroy = options.destroy;
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182 | }
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183 |
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184 | Stream.call(this);
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185 | }
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186 |
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187 | Object.defineProperty(Readable.prototype, 'destroyed', {
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188 |
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189 |
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190 |
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191 | enumerable: false,
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192 | get: function get() {
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193 | if (this._readableState === undefined) {
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194 | return false;
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195 | }
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196 |
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197 | return this._readableState.destroyed;
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198 | },
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199 | set: function set(value) {
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200 |
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201 |
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202 | if (!this._readableState) {
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203 | return;
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204 | }
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205 |
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206 |
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207 |
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208 | this._readableState.destroyed = value;
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209 | }
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210 | });
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211 | Readable.prototype.destroy = destroyImpl.destroy;
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212 | Readable.prototype._undestroy = destroyImpl.undestroy;
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213 |
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214 | Readable.prototype._destroy = function (err, cb) {
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215 | cb(err);
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216 | };
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217 |
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218 |
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219 |
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220 |
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221 |
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222 | Readable.prototype.push = function (chunk, encoding) {
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223 | var state = this._readableState;
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224 | var skipChunkCheck;
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225 |
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226 | if (!state.objectMode) {
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227 | if (typeof chunk === 'string') {
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228 | encoding = encoding || state.defaultEncoding;
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229 |
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230 | if (encoding !== state.encoding) {
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231 | chunk = Buffer.from(chunk, encoding);
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232 | encoding = '';
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233 | }
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234 |
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235 | skipChunkCheck = true;
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236 | }
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237 | } else {
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238 | skipChunkCheck = true;
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239 | }
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240 |
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241 | return readableAddChunk(this, chunk, encoding, false, skipChunkCheck);
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242 | };
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243 |
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244 |
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245 | Readable.prototype.unshift = function (chunk) {
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246 | return readableAddChunk(this, chunk, null, true, false);
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247 | };
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248 |
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249 | function readableAddChunk(stream, chunk, encoding, addToFront, skipChunkCheck) {
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250 | debug('readableAddChunk', chunk);
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251 | var state = stream._readableState;
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252 |
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253 | if (chunk === null) {
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254 | state.reading = false;
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255 | onEofChunk(stream, state);
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256 | } else {
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257 | var er;
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258 | if (!skipChunkCheck) er = chunkInvalid(state, chunk);
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259 |
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260 | if (er) {
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261 | errorOrDestroy(stream, er);
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262 | } else if (state.objectMode || chunk && chunk.length > 0) {
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263 | if (typeof chunk !== 'string' && !state.objectMode && Object.getPrototypeOf(chunk) !== Buffer.prototype) {
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264 | chunk = _uint8ArrayToBuffer(chunk);
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265 | }
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266 |
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267 | if (addToFront) {
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268 | if (state.endEmitted) errorOrDestroy(stream, new ERR_STREAM_UNSHIFT_AFTER_END_EVENT());else addChunk(stream, state, chunk, true);
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269 | } else if (state.ended) {
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270 | errorOrDestroy(stream, new ERR_STREAM_PUSH_AFTER_EOF());
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271 | } else if (state.destroyed) {
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272 | return false;
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273 | } else {
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274 | state.reading = false;
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275 |
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276 | if (state.decoder && !encoding) {
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277 | chunk = state.decoder.write(chunk);
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278 | if (state.objectMode || chunk.length !== 0) addChunk(stream, state, chunk, false);else maybeReadMore(stream, state);
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279 | } else {
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280 | addChunk(stream, state, chunk, false);
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281 | }
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282 | }
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283 | } else if (!addToFront) {
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284 | state.reading = false;
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285 | maybeReadMore(stream, state);
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286 | }
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287 | }
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288 |
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289 |
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290 |
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291 |
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292 | return !state.ended && (state.length < state.highWaterMark || state.length === 0);
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293 | }
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294 |
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295 | function addChunk(stream, state, chunk, addToFront) {
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296 | if (state.flowing && state.length === 0 && !state.sync) {
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297 | state.awaitDrain = 0;
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298 | stream.emit('data', chunk);
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299 | } else {
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300 |
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301 | state.length += state.objectMode ? 1 : chunk.length;
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302 | if (addToFront) state.buffer.unshift(chunk);else state.buffer.push(chunk);
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303 | if (state.needReadable) emitReadable(stream);
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304 | }
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305 |
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306 | maybeReadMore(stream, state);
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307 | }
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308 |
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309 | function chunkInvalid(state, chunk) {
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310 | var er;
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311 |
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312 | if (!_isUint8Array(chunk) && typeof chunk !== 'string' && chunk !== undefined && !state.objectMode) {
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313 | er = new ERR_INVALID_ARG_TYPE('chunk', ['string', 'Buffer', 'Uint8Array'], chunk);
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314 | }
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315 |
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316 | return er;
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317 | }
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318 |
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319 | Readable.prototype.isPaused = function () {
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320 | return this._readableState.flowing === false;
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321 | };
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322 |
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323 |
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324 | Readable.prototype.setEncoding = function (enc) {
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325 | if (!StringDecoder) StringDecoder = require('string_decoder/').StringDecoder;
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326 | var decoder = new StringDecoder(enc);
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327 | this._readableState.decoder = decoder;
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328 |
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329 | this._readableState.encoding = this._readableState.decoder.encoding;
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330 |
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331 | var p = this._readableState.buffer.head;
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332 | var content = '';
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333 |
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334 | while (p !== null) {
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335 | content += decoder.write(p.data);
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336 | p = p.next;
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337 | }
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338 |
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339 | this._readableState.buffer.clear();
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340 |
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341 | if (content !== '') this._readableState.buffer.push(content);
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342 | this._readableState.length = content.length;
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343 | return this;
|
344 | };
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345 |
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346 |
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347 | var MAX_HWM = 0x40000000;
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348 |
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349 | function computeNewHighWaterMark(n) {
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350 | if (n >= MAX_HWM) {
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351 |
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352 | n = MAX_HWM;
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353 | } else {
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354 |
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355 |
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356 | n--;
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357 | n |= n >>> 1;
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358 | n |= n >>> 2;
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359 | n |= n >>> 4;
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360 | n |= n >>> 8;
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361 | n |= n >>> 16;
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362 | n++;
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363 | }
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364 |
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365 | return n;
|
366 | }
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367 |
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368 |
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369 |
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370 | function howMuchToRead(n, state) {
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371 | if (n <= 0 || state.length === 0 && state.ended) return 0;
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372 | if (state.objectMode) return 1;
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373 |
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374 | if (n !== n) {
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375 |
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376 | if (state.flowing && state.length) return state.buffer.head.data.length;else return state.length;
|
377 | }
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378 |
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379 |
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380 | if (n > state.highWaterMark) state.highWaterMark = computeNewHighWaterMark(n);
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381 | if (n <= state.length) return n;
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382 |
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383 | if (!state.ended) {
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384 | state.needReadable = true;
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385 | return 0;
|
386 | }
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387 |
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388 | return state.length;
|
389 | }
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390 |
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391 |
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392 | Readable.prototype.read = function (n) {
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393 | debug('read', n);
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394 | n = parseInt(n, 10);
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395 | var state = this._readableState;
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396 | var nOrig = n;
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397 | if (n !== 0) state.emittedReadable = false;
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398 |
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399 |
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400 |
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401 | if (n === 0 && state.needReadable && ((state.highWaterMark !== 0 ? state.length >= state.highWaterMark : state.length > 0) || state.ended)) {
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402 | debug('read: emitReadable', state.length, state.ended);
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403 | if (state.length === 0 && state.ended) endReadable(this);else emitReadable(this);
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404 | return null;
|
405 | }
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406 |
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407 | n = howMuchToRead(n, state);
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408 |
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409 | if (n === 0 && state.ended) {
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410 | if (state.length === 0) endReadable(this);
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411 | return null;
|
412 | }
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413 |
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414 |
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415 |
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416 |
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417 |
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418 |
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419 |
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420 |
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421 |
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422 |
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423 |
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424 |
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425 |
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426 |
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427 |
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428 |
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429 |
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430 |
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431 |
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432 |
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433 |
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434 |
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435 |
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436 | var doRead = state.needReadable;
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437 | debug('need readable', doRead);
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438 |
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439 | if (state.length === 0 || state.length - n < state.highWaterMark) {
|
440 | doRead = true;
|
441 | debug('length less than watermark', doRead);
|
442 | }
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443 |
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444 |
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445 |
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446 | if (state.ended || state.reading) {
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447 | doRead = false;
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448 | debug('reading or ended', doRead);
|
449 | } else if (doRead) {
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450 | debug('do read');
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451 | state.reading = true;
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452 | state.sync = true;
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453 |
|
454 | if (state.length === 0) state.needReadable = true;
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455 |
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456 | this._read(state.highWaterMark);
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457 |
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458 | state.sync = false;
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459 |
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460 |
|
461 | if (!state.reading) n = howMuchToRead(nOrig, state);
|
462 | }
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463 |
|
464 | var ret;
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465 | if (n > 0) ret = fromList(n, state);else ret = null;
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466 |
|
467 | if (ret === null) {
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468 | state.needReadable = state.length <= state.highWaterMark;
|
469 | n = 0;
|
470 | } else {
|
471 | state.length -= n;
|
472 | state.awaitDrain = 0;
|
473 | }
|
474 |
|
475 | if (state.length === 0) {
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476 |
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477 |
|
478 | if (!state.ended) state.needReadable = true;
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479 |
|
480 | if (nOrig !== n && state.ended) endReadable(this);
|
481 | }
|
482 |
|
483 | if (ret !== null) this.emit('data', ret);
|
484 | return ret;
|
485 | };
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486 |
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487 | function onEofChunk(stream, state) {
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488 | debug('onEofChunk');
|
489 | if (state.ended) return;
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490 |
|
491 | if (state.decoder) {
|
492 | var chunk = state.decoder.end();
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493 |
|
494 | if (chunk && chunk.length) {
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495 | state.buffer.push(chunk);
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496 | state.length += state.objectMode ? 1 : chunk.length;
|
497 | }
|
498 | }
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499 |
|
500 | state.ended = true;
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501 |
|
502 | if (state.sync) {
|
503 |
|
504 |
|
505 |
|
506 | emitReadable(stream);
|
507 | } else {
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508 |
|
509 | state.needReadable = false;
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510 |
|
511 | if (!state.emittedReadable) {
|
512 | state.emittedReadable = true;
|
513 | emitReadable_(stream);
|
514 | }
|
515 | }
|
516 | }
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517 |
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518 |
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519 |
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520 |
|
521 | function emitReadable(stream) {
|
522 | var state = stream._readableState;
|
523 | debug('emitReadable', state.needReadable, state.emittedReadable);
|
524 | state.needReadable = false;
|
525 |
|
526 | if (!state.emittedReadable) {
|
527 | debug('emitReadable', state.flowing);
|
528 | state.emittedReadable = true;
|
529 | process.nextTick(emitReadable_, stream);
|
530 | }
|
531 | }
|
532 |
|
533 | function emitReadable_(stream) {
|
534 | var state = stream._readableState;
|
535 | debug('emitReadable_', state.destroyed, state.length, state.ended);
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536 |
|
537 | if (!state.destroyed && (state.length || state.ended)) {
|
538 | stream.emit('readable');
|
539 | state.emittedReadable = false;
|
540 | }
|
541 |
|
542 |
|
543 |
|
544 |
|
545 |
|
546 |
|
547 |
|
548 | state.needReadable = !state.flowing && !state.ended && state.length <= state.highWaterMark;
|
549 | flow(stream);
|
550 | }
|
551 |
|
552 |
|
553 |
|
554 |
|
555 |
|
556 |
|
557 |
|
558 | function maybeReadMore(stream, state) {
|
559 | if (!state.readingMore) {
|
560 | state.readingMore = true;
|
561 | process.nextTick(maybeReadMore_, stream, state);
|
562 | }
|
563 | }
|
564 |
|
565 | function maybeReadMore_(stream, state) {
|
566 |
|
567 |
|
568 |
|
569 |
|
570 |
|
571 |
|
572 |
|
573 |
|
574 |
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575 |
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576 |
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577 |
|
578 |
|
579 |
|
580 |
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581 |
|
582 |
|
583 |
|
584 |
|
585 |
|
586 |
|
587 |
|
588 |
|
589 | while (!state.reading && !state.ended && (state.length < state.highWaterMark || state.flowing && state.length === 0)) {
|
590 | var len = state.length;
|
591 | debug('maybeReadMore read 0');
|
592 | stream.read(0);
|
593 | if (len === state.length)
|
594 | break;
|
595 | }
|
596 |
|
597 | state.readingMore = false;
|
598 | }
|
599 |
|
600 |
|
601 |
|
602 |
|
603 |
|
604 | Readable.prototype._read = function (n) {
|
605 | errorOrDestroy(this, new ERR_METHOD_NOT_IMPLEMENTED('_read()'));
|
606 | };
|
607 |
|
608 | Readable.prototype.pipe = function (dest, pipeOpts) {
|
609 | var src = this;
|
610 | var state = this._readableState;
|
611 |
|
612 | switch (state.pipesCount) {
|
613 | case 0:
|
614 | state.pipes = dest;
|
615 | break;
|
616 |
|
617 | case 1:
|
618 | state.pipes = [state.pipes, dest];
|
619 | break;
|
620 |
|
621 | default:
|
622 | state.pipes.push(dest);
|
623 | break;
|
624 | }
|
625 |
|
626 | state.pipesCount += 1;
|
627 | debug('pipe count=%d opts=%j', state.pipesCount, pipeOpts);
|
628 | var doEnd = (!pipeOpts || pipeOpts.end !== false) && dest !== process.stdout && dest !== process.stderr;
|
629 | var endFn = doEnd ? onend : unpipe;
|
630 | if (state.endEmitted) process.nextTick(endFn);else src.once('end', endFn);
|
631 | dest.on('unpipe', onunpipe);
|
632 |
|
633 | function onunpipe(readable, unpipeInfo) {
|
634 | debug('onunpipe');
|
635 |
|
636 | if (readable === src) {
|
637 | if (unpipeInfo && unpipeInfo.hasUnpiped === false) {
|
638 | unpipeInfo.hasUnpiped = true;
|
639 | cleanup();
|
640 | }
|
641 | }
|
642 | }
|
643 |
|
644 | function onend() {
|
645 | debug('onend');
|
646 | dest.end();
|
647 | }
|
648 |
|
649 |
|
650 |
|
651 |
|
652 |
|
653 | var ondrain = pipeOnDrain(src);
|
654 | dest.on('drain', ondrain);
|
655 | var cleanedUp = false;
|
656 |
|
657 | function cleanup() {
|
658 | debug('cleanup');
|
659 |
|
660 | dest.removeListener('close', onclose);
|
661 | dest.removeListener('finish', onfinish);
|
662 | dest.removeListener('drain', ondrain);
|
663 | dest.removeListener('error', onerror);
|
664 | dest.removeListener('unpipe', onunpipe);
|
665 | src.removeListener('end', onend);
|
666 | src.removeListener('end', unpipe);
|
667 | src.removeListener('data', ondata);
|
668 | cleanedUp = true;
|
669 |
|
670 |
|
671 |
|
672 |
|
673 |
|
674 | if (state.awaitDrain && (!dest._writableState || dest._writableState.needDrain)) ondrain();
|
675 | }
|
676 |
|
677 | src.on('data', ondata);
|
678 |
|
679 | function ondata(chunk) {
|
680 | debug('ondata');
|
681 | var ret = dest.write(chunk);
|
682 | debug('dest.write', ret);
|
683 |
|
684 | if (ret === false) {
|
685 |
|
686 |
|
687 |
|
688 |
|
689 | if ((state.pipesCount === 1 && state.pipes === dest || state.pipesCount > 1 && indexOf(state.pipes, dest) !== -1) && !cleanedUp) {
|
690 | debug('false write response, pause', state.awaitDrain);
|
691 | state.awaitDrain++;
|
692 | }
|
693 |
|
694 | src.pause();
|
695 | }
|
696 | }
|
697 |
|
698 |
|
699 |
|
700 | function onerror(er) {
|
701 | debug('onerror', er);
|
702 | unpipe();
|
703 | dest.removeListener('error', onerror);
|
704 | if (EElistenerCount(dest, 'error') === 0) errorOrDestroy(dest, er);
|
705 | }
|
706 |
|
707 |
|
708 | prependListener(dest, 'error', onerror);
|
709 |
|
710 | function onclose() {
|
711 | dest.removeListener('finish', onfinish);
|
712 | unpipe();
|
713 | }
|
714 |
|
715 | dest.once('close', onclose);
|
716 |
|
717 | function onfinish() {
|
718 | debug('onfinish');
|
719 | dest.removeListener('close', onclose);
|
720 | unpipe();
|
721 | }
|
722 |
|
723 | dest.once('finish', onfinish);
|
724 |
|
725 | function unpipe() {
|
726 | debug('unpipe');
|
727 | src.unpipe(dest);
|
728 | }
|
729 |
|
730 |
|
731 | dest.emit('pipe', src);
|
732 |
|
733 | if (!state.flowing) {
|
734 | debug('pipe resume');
|
735 | src.resume();
|
736 | }
|
737 |
|
738 | return dest;
|
739 | };
|
740 |
|
741 | function pipeOnDrain(src) {
|
742 | return function pipeOnDrainFunctionResult() {
|
743 | var state = src._readableState;
|
744 | debug('pipeOnDrain', state.awaitDrain);
|
745 | if (state.awaitDrain) state.awaitDrain--;
|
746 |
|
747 | if (state.awaitDrain === 0 && EElistenerCount(src, 'data')) {
|
748 | state.flowing = true;
|
749 | flow(src);
|
750 | }
|
751 | };
|
752 | }
|
753 |
|
754 | Readable.prototype.unpipe = function (dest) {
|
755 | var state = this._readableState;
|
756 | var unpipeInfo = {
|
757 | hasUnpiped: false
|
758 | };
|
759 |
|
760 | if (state.pipesCount === 0) return this;
|
761 |
|
762 | if (state.pipesCount === 1) {
|
763 |
|
764 | if (dest && dest !== state.pipes) return this;
|
765 | if (!dest) dest = state.pipes;
|
766 |
|
767 | state.pipes = null;
|
768 | state.pipesCount = 0;
|
769 | state.flowing = false;
|
770 | if (dest) dest.emit('unpipe', this, unpipeInfo);
|
771 | return this;
|
772 | }
|
773 |
|
774 |
|
775 | if (!dest) {
|
776 |
|
777 | var dests = state.pipes;
|
778 | var len = state.pipesCount;
|
779 | state.pipes = null;
|
780 | state.pipesCount = 0;
|
781 | state.flowing = false;
|
782 |
|
783 | for (var i = 0; i < len; i++) {
|
784 | dests[i].emit('unpipe', this, {
|
785 | hasUnpiped: false
|
786 | });
|
787 | }
|
788 |
|
789 | return this;
|
790 | }
|
791 |
|
792 |
|
793 | var index = indexOf(state.pipes, dest);
|
794 | if (index === -1) return this;
|
795 | state.pipes.splice(index, 1);
|
796 | state.pipesCount -= 1;
|
797 | if (state.pipesCount === 1) state.pipes = state.pipes[0];
|
798 | dest.emit('unpipe', this, unpipeInfo);
|
799 | return this;
|
800 | };
|
801 |
|
802 |
|
803 |
|
804 | Readable.prototype.on = function (ev, fn) {
|
805 | var res = Stream.prototype.on.call(this, ev, fn);
|
806 | var state = this._readableState;
|
807 |
|
808 | if (ev === 'data') {
|
809 |
|
810 |
|
811 | state.readableListening = this.listenerCount('readable') > 0;
|
812 |
|
813 | if (state.flowing !== false) this.resume();
|
814 | } else if (ev === 'readable') {
|
815 | if (!state.endEmitted && !state.readableListening) {
|
816 | state.readableListening = state.needReadable = true;
|
817 | state.flowing = false;
|
818 | state.emittedReadable = false;
|
819 | debug('on readable', state.length, state.reading);
|
820 |
|
821 | if (state.length) {
|
822 | emitReadable(this);
|
823 | } else if (!state.reading) {
|
824 | process.nextTick(nReadingNextTick, this);
|
825 | }
|
826 | }
|
827 | }
|
828 |
|
829 | return res;
|
830 | };
|
831 |
|
832 | Readable.prototype.addListener = Readable.prototype.on;
|
833 |
|
834 | Readable.prototype.removeListener = function (ev, fn) {
|
835 | var res = Stream.prototype.removeListener.call(this, ev, fn);
|
836 |
|
837 | if (ev === 'readable') {
|
838 |
|
839 |
|
840 |
|
841 |
|
842 |
|
843 |
|
844 | process.nextTick(updateReadableListening, this);
|
845 | }
|
846 |
|
847 | return res;
|
848 | };
|
849 |
|
850 | Readable.prototype.removeAllListeners = function (ev) {
|
851 | var res = Stream.prototype.removeAllListeners.apply(this, arguments);
|
852 |
|
853 | if (ev === 'readable' || ev === undefined) {
|
854 |
|
855 |
|
856 |
|
857 |
|
858 |
|
859 |
|
860 | process.nextTick(updateReadableListening, this);
|
861 | }
|
862 |
|
863 | return res;
|
864 | };
|
865 |
|
866 | function updateReadableListening(self) {
|
867 | var state = self._readableState;
|
868 | state.readableListening = self.listenerCount('readable') > 0;
|
869 |
|
870 | if (state.resumeScheduled && !state.paused) {
|
871 |
|
872 |
|
873 | state.flowing = true;
|
874 | } else if (self.listenerCount('data') > 0) {
|
875 | self.resume();
|
876 | }
|
877 | }
|
878 |
|
879 | function nReadingNextTick(self) {
|
880 | debug('readable nexttick read 0');
|
881 | self.read(0);
|
882 | }
|
883 |
|
884 |
|
885 |
|
886 | Readable.prototype.resume = function () {
|
887 | var state = this._readableState;
|
888 |
|
889 | if (!state.flowing) {
|
890 | debug('resume');
|
891 |
|
892 |
|
893 |
|
894 | state.flowing = !state.readableListening;
|
895 | resume(this, state);
|
896 | }
|
897 |
|
898 | state.paused = false;
|
899 | return this;
|
900 | };
|
901 |
|
902 | function resume(stream, state) {
|
903 | if (!state.resumeScheduled) {
|
904 | state.resumeScheduled = true;
|
905 | process.nextTick(resume_, stream, state);
|
906 | }
|
907 | }
|
908 |
|
909 | function resume_(stream, state) {
|
910 | debug('resume', state.reading);
|
911 |
|
912 | if (!state.reading) {
|
913 | stream.read(0);
|
914 | }
|
915 |
|
916 | state.resumeScheduled = false;
|
917 | stream.emit('resume');
|
918 | flow(stream);
|
919 | if (state.flowing && !state.reading) stream.read(0);
|
920 | }
|
921 |
|
922 | Readable.prototype.pause = function () {
|
923 | debug('call pause flowing=%j', this._readableState.flowing);
|
924 |
|
925 | if (this._readableState.flowing !== false) {
|
926 | debug('pause');
|
927 | this._readableState.flowing = false;
|
928 | this.emit('pause');
|
929 | }
|
930 |
|
931 | this._readableState.paused = true;
|
932 | return this;
|
933 | };
|
934 |
|
935 | function flow(stream) {
|
936 | var state = stream._readableState;
|
937 | debug('flow', state.flowing);
|
938 |
|
939 | while (state.flowing && stream.read() !== null) {
|
940 | ;
|
941 | }
|
942 | }
|
943 |
|
944 |
|
945 |
|
946 |
|
947 | Readable.prototype.wrap = function (stream) {
|
948 | var _this = this;
|
949 |
|
950 | var state = this._readableState;
|
951 | var paused = false;
|
952 | stream.on('end', function () {
|
953 | debug('wrapped end');
|
954 |
|
955 | if (state.decoder && !state.ended) {
|
956 | var chunk = state.decoder.end();
|
957 | if (chunk && chunk.length) _this.push(chunk);
|
958 | }
|
959 |
|
960 | _this.push(null);
|
961 | });
|
962 | stream.on('data', function (chunk) {
|
963 | debug('wrapped data');
|
964 | if (state.decoder) chunk = state.decoder.write(chunk);
|
965 |
|
966 | if (state.objectMode && (chunk === null || chunk === undefined)) return;else if (!state.objectMode && (!chunk || !chunk.length)) return;
|
967 |
|
968 | var ret = _this.push(chunk);
|
969 |
|
970 | if (!ret) {
|
971 | paused = true;
|
972 | stream.pause();
|
973 | }
|
974 | });
|
975 |
|
976 |
|
977 | for (var i in stream) {
|
978 | if (this[i] === undefined && typeof stream[i] === 'function') {
|
979 | this[i] = function methodWrap(method) {
|
980 | return function methodWrapReturnFunction() {
|
981 | return stream[method].apply(stream, arguments);
|
982 | };
|
983 | }(i);
|
984 | }
|
985 | }
|
986 |
|
987 |
|
988 | for (var n = 0; n < kProxyEvents.length; n++) {
|
989 | stream.on(kProxyEvents[n], this.emit.bind(this, kProxyEvents[n]));
|
990 | }
|
991 |
|
992 |
|
993 |
|
994 | this._read = function (n) {
|
995 | debug('wrapped _read', n);
|
996 |
|
997 | if (paused) {
|
998 | paused = false;
|
999 | stream.resume();
|
1000 | }
|
1001 | };
|
1002 |
|
1003 | return this;
|
1004 | };
|
1005 |
|
1006 | if (typeof Symbol === 'function') {
|
1007 | Readable.prototype[Symbol.asyncIterator] = function () {
|
1008 | if (createReadableStreamAsyncIterator === undefined) {
|
1009 | createReadableStreamAsyncIterator = require('./internal/streams/async_iterator');
|
1010 | }
|
1011 |
|
1012 | return createReadableStreamAsyncIterator(this);
|
1013 | };
|
1014 | }
|
1015 |
|
1016 | Object.defineProperty(Readable.prototype, 'readableHighWaterMark', {
|
1017 |
|
1018 |
|
1019 |
|
1020 | enumerable: false,
|
1021 | get: function get() {
|
1022 | return this._readableState.highWaterMark;
|
1023 | }
|
1024 | });
|
1025 | Object.defineProperty(Readable.prototype, 'readableBuffer', {
|
1026 |
|
1027 |
|
1028 |
|
1029 | enumerable: false,
|
1030 | get: function get() {
|
1031 | return this._readableState && this._readableState.buffer;
|
1032 | }
|
1033 | });
|
1034 | Object.defineProperty(Readable.prototype, 'readableFlowing', {
|
1035 |
|
1036 |
|
1037 |
|
1038 | enumerable: false,
|
1039 | get: function get() {
|
1040 | return this._readableState.flowing;
|
1041 | },
|
1042 | set: function set(state) {
|
1043 | if (this._readableState) {
|
1044 | this._readableState.flowing = state;
|
1045 | }
|
1046 | }
|
1047 | });
|
1048 |
|
1049 | Readable._fromList = fromList;
|
1050 | Object.defineProperty(Readable.prototype, 'readableLength', {
|
1051 |
|
1052 |
|
1053 |
|
1054 | enumerable: false,
|
1055 | get: function get() {
|
1056 | return this._readableState.length;
|
1057 | }
|
1058 | });
|
1059 |
|
1060 |
|
1061 |
|
1062 |
|
1063 | function fromList(n, state) {
|
1064 |
|
1065 | if (state.length === 0) return null;
|
1066 | var ret;
|
1067 | if (state.objectMode) ret = state.buffer.shift();else if (!n || n >= state.length) {
|
1068 |
|
1069 | if (state.decoder) ret = state.buffer.join('');else if (state.buffer.length === 1) ret = state.buffer.first();else ret = state.buffer.concat(state.length);
|
1070 | state.buffer.clear();
|
1071 | } else {
|
1072 |
|
1073 | ret = state.buffer.consume(n, state.decoder);
|
1074 | }
|
1075 | return ret;
|
1076 | }
|
1077 |
|
1078 | function endReadable(stream) {
|
1079 | var state = stream._readableState;
|
1080 | debug('endReadable', state.endEmitted);
|
1081 |
|
1082 | if (!state.endEmitted) {
|
1083 | state.ended = true;
|
1084 | process.nextTick(endReadableNT, state, stream);
|
1085 | }
|
1086 | }
|
1087 |
|
1088 | function endReadableNT(state, stream) {
|
1089 | debug('endReadableNT', state.endEmitted, state.length);
|
1090 |
|
1091 | if (!state.endEmitted && state.length === 0) {
|
1092 | state.endEmitted = true;
|
1093 | stream.readable = false;
|
1094 | stream.emit('end');
|
1095 |
|
1096 | if (state.autoDestroy) {
|
1097 |
|
1098 |
|
1099 | var wState = stream._writableState;
|
1100 |
|
1101 | if (!wState || wState.autoDestroy && wState.finished) {
|
1102 | stream.destroy();
|
1103 | }
|
1104 | }
|
1105 | }
|
1106 | }
|
1107 |
|
1108 | if (typeof Symbol === 'function') {
|
1109 | Readable.from = function (iterable, opts) {
|
1110 | if (from === undefined) {
|
1111 | from = require('./internal/streams/from');
|
1112 | }
|
1113 |
|
1114 | return from(Readable, iterable, opts);
|
1115 | };
|
1116 | }
|
1117 |
|
1118 | function indexOf(xs, x) {
|
1119 | for (var i = 0, l = xs.length; i < l; i++) {
|
1120 | if (xs[i] === x) return i;
|
1121 | }
|
1122 |
|
1123 | return -1;
|
1124 | } |
\ | No newline at end of file |