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7 | import * as queue from './queue.js'
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8 | import * as object from './object.js'
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9 |
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10 |
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11 |
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12 |
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13 |
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14 |
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15 | const ctxFs = queue.create()
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16 |
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17 |
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18 |
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19 |
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20 | const runInGlobalContext = f => {
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21 | const isEmpty = queue.isEmpty(ctxFs)
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22 | queue.enqueue(ctxFs, new queue.QueueValue(f))
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23 | if (isEmpty) {
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24 | while (!queue.isEmpty(ctxFs)) {
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25 | (ctxFs.start).v()
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26 | queue.dequeue(ctxFs)
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27 | }
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28 | }
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29 | }
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30 |
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31 |
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32 |
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33 |
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34 |
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35 |
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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 | export class PledgeInstance {
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41 | constructor () {
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42 | |
43 |
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44 |
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45 | this._v = null
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46 | this.isResolved = false
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47 | |
48 |
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49 |
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50 | this._whenResolved = []
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51 | |
52 |
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53 |
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54 | this._whenCanceled = []
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55 | }
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56 |
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57 | get isDone () {
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58 | return this._whenResolved === null
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59 | }
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60 |
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61 | get isCanceled () {
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62 | return !this.isResolved && this._whenResolved === null
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63 | }
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64 |
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65 | |
66 |
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67 |
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68 | resolve (v) {
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69 | const whenResolved = this._whenResolved
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70 | if (whenResolved === null) return
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71 | this._v = v
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72 | this.isResolved = true
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73 | this._whenResolved = null
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74 | this._whenCanceled = null
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75 | for (let i = 0; i < whenResolved.length; i++) {
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76 | whenResolved[i](v)
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77 | }
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78 | }
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79 |
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80 | |
81 |
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82 |
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83 | cancel (reason) {
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84 | const whenCanceled = this._whenCanceled
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85 | if (whenCanceled === null) return
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86 | this._v = reason
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87 | this._whenResolved = null
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88 | this._whenCanceled = null
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89 | for (let i = 0; i < whenCanceled.length; i++) {
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90 | whenCanceled[i](reason)
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91 | }
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92 | }
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93 |
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94 | |
95 |
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96 |
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97 |
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98 |
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99 | map (f) {
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100 | |
101 |
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102 |
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103 | const p = new PledgeInstance()
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104 | this.whenResolved(v => {
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105 | const result = f(v)
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106 | if (result instanceof PledgeInstance) {
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107 | if (result._whenResolved === null) {
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108 | result.resolve( (result._v))
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109 | } else {
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110 | result._whenResolved.push(p.resolve.bind(p))
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111 | }
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112 | } else {
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113 | p.resolve(result)
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114 | }
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115 | })
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116 | return p
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117 | }
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118 |
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119 | |
120 |
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121 |
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122 | whenResolved (f) {
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123 | if (this.isResolved) {
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124 | f( (this._v))
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125 | } else {
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126 | this._whenResolved?.push(f)
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127 | }
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128 | }
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129 |
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130 | |
131 |
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132 |
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133 | whenCanceled (f) {
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134 | if (this.isCanceled) {
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135 | f( (this._v))
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136 | } else {
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137 | this._whenCanceled?.push(f)
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138 | }
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139 | }
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140 |
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141 | |
142 |
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143 |
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144 | promise () {
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145 | return new Promise((resolve, reject) => {
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146 | this.whenResolved(resolve)
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147 | this.whenCanceled(reject)
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148 | })
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149 | }
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150 | }
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151 |
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152 |
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153 |
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154 |
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155 |
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156 | export const create = () => new PledgeInstance()
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157 |
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158 |
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159 |
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160 |
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161 |
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162 |
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163 |
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164 |
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165 |
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166 |
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168 |
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169 |
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170 |
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171 |
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172 |
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173 |
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174 |
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175 |
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176 |
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177 | export const createWithDependencies = (init, ...deps) => {
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178 | |
179 |
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180 |
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181 | const p = new PledgeInstance()
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182 |
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183 | all(deps).whenResolved(ds => init(p, ...ds))
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184 | return p
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185 | }
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186 |
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187 |
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188 |
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189 |
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190 |
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191 |
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192 | export const whenResolved = (p, f) => {
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193 | if (p instanceof PledgeInstance) {
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194 | return p.whenResolved(f)
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195 | }
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196 | return f(p)
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197 | }
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198 |
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199 |
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200 |
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201 |
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202 |
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203 |
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204 | export const whenCanceled = (p, f) => {
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205 | if (p instanceof PledgeInstance) {
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206 | p.whenCanceled(f)
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207 | }
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208 | }
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209 |
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210 |
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211 |
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212 |
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213 |
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214 |
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215 |
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216 |
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217 | export const map = (p, f) => {
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218 | if (p instanceof PledgeInstance) {
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219 | return p.map(f)
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220 | }
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221 | return f(p)
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222 | }
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223 |
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224 |
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225 |
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226 |
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227 |
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228 |
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229 | export const all = ps => {
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230 | |
231 |
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232 |
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233 | const pall = create()
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234 | |
235 |
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236 |
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237 | const result = ps instanceof Array ? new Array(ps.length) : {}
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238 | let waitingPs = ps instanceof Array ? ps.length : object.size(ps)
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239 | for (const key in ps) {
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240 | const p = ps[key]
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241 | whenResolved(p, r => {
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242 | result[key] = r
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243 | if (--waitingPs === 0) {
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244 |
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245 | pall.resolve(result)
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246 | }
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247 | })
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248 | }
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249 | return pall
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250 | }
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251 |
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252 |
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253 |
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254 |
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255 |
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256 |
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257 |
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258 | export const coroutine = f => {
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259 | const p = create()
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260 | const gen = f()
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261 | |
262 |
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263 |
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264 | const handleGen = (yv) => {
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265 | const res = gen.next(yv)
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266 | if (res.done) {
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267 | p.resolve(res.value)
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268 | return
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269 | }
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270 |
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271 | whenCanceled(res.value, (reason) => {
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272 | gen.throw(reason)
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273 | })
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274 | runInGlobalContext(() =>
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275 | whenResolved(res.value, handleGen)
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276 | )
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277 | }
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278 | handleGen()
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279 | return p
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280 | }
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281 |
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282 |
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283 |
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284 |
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285 |
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286 | export const wait = timeout => {
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287 | const p = create()
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288 | setTimeout(p.resolve.bind(p), timeout)
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289 | return p
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290 | }
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291 |
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292 |
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