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@@ -0,0 +1,169 | |||||
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1 | import { id as mid } from "module"; | |||
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2 | import { AccumulatorFn, FusedProducer, Observable, Observer, OperatorFn } from "./interfaces"; | |||
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3 | import { TraceSource } from "@implab/core-amd/log/TraceSource"; | |||
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4 | import { scan } from "dojo/parser"; | |||
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5 | import { filter } from "dojo/query"; | |||
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6 | ||||
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7 | const trace = TraceSource.get(mid); | |||
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8 | ||||
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9 | const noop = () => { }; | |||
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10 | ||||
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11 | const errorFallback = (e: unknown) => trace.error("Unhandled observable error: {0}", e); | |||
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12 | ||||
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13 | const sink = <T>(consumer: Observer<T>) => { | |||
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14 | // eslint-disable-next-line @typescript-eslint/unbound-method | |||
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15 | const { next, error, complete } = consumer; | |||
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16 | return { | |||
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17 | next: next ? next.bind(consumer) : noop, | |||
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18 | error: error ? error.bind(consumer) : errorFallback, // report unhandled errors | |||
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19 | complete: complete ? complete.bind(consumer) : noop | |||
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20 | }; | |||
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21 | }; | |||
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22 | ||||
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23 | const | |||
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24 | ||||
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25 | export class ObservableImpl<T> implements Observable<T> { | |||
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26 | ||||
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27 | private readonly _producer: FusedProducer<T>; | |||
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28 | ||||
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29 | constructor(producer: FusedProducer<T>) { | |||
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30 | this._producer = producer; | |||
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31 | } | |||
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32 | ||||
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33 | subscribe(consumer: Observer<T> = {}) { | |||
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34 | return { | |||
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35 | unsubscribe: this._producer(sink(consumer)) ?? noop | |||
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36 | } | |||
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37 | } | |||
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38 | ||||
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39 | map<T2>(mapper: (value: T) => T2) { | |||
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40 | return new ObservableImpl<T2>(({ next, ...rest }) => | |||
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41 | this._producer({ | |||
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42 | next: next !== noop ? (v: T) => next(mapper(v)) : noop, | |||
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43 | ...rest | |||
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44 | })); | |||
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45 | } | |||
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46 | ||||
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47 | tap({ next: tapNext, complete: tapComplete, error: tapError }: Observer<T>) { | |||
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48 | return new ObservableImpl<T>(({ next, complete, error }) => | |||
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49 | this._producer({ | |||
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50 | next: tapNext ? (v => (tapNext(v), next(v))) : next, | |||
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51 | complete: tapComplete ? (() => (tapComplete(), complete())) : complete, | |||
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52 | error: tapError ? (e => (tapError(e), error(e))) : error | |||
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53 | })); | |||
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54 | } | |||
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55 | ||||
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56 | filter: (predicate) => _observe(({ next, ...rest }) => | |||
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57 | producer({ | |||
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58 | next: next !== noop ? (v: T) => predicate(v) ? next(v) : void (0) : noop, | |||
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59 | ...rest | |||
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60 | }) | |||
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61 | ), | |||
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62 | ||||
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63 | until: predicate => _observe(({ next, complete, ...rest }) => | |||
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64 | producer({ | |||
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65 | next: v => predicate(v) ? complete() : next(v), | |||
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66 | complete, | |||
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67 | ...rest | |||
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68 | }) | |||
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69 | ), | |||
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70 | ||||
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71 | while: predicate => _observe(({ next, complete, ...rest }) => | |||
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72 | producer({ | |||
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73 | next: v => predicate(v) ? next(v) : complete(), | |||
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74 | complete, | |||
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75 | ...rest | |||
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76 | }) | |||
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77 | ), | |||
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78 | ||||
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79 | scan: <A>(...args: [AccumulatorFn<T, A>, A] | [AccumulatorFn<T, T>]) => _observe<T | A>(({ next, ...rest }) => { | |||
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80 | if (args.length === 1) { | |||
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81 | const [accumulator] = args; | |||
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82 | let _acc: T; | |||
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83 | let index = 0; | |||
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84 | return producer({ | |||
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85 | next: next !== noop ? (v: T) => next(index++ === 0 ? _acc = v : _acc = accumulator(_acc, v)) : noop, | |||
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86 | ...rest | |||
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87 | }); | |||
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88 | } else { | |||
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89 | const [accumulator, initial] = args; | |||
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90 | let _acc = initial; | |||
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91 | return producer({ | |||
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92 | next: next !== noop ? (v: T) => next(_acc = accumulator(_acc, v)) : noop, | |||
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93 | ...rest | |||
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94 | }); | |||
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95 | } | |||
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96 | }), | |||
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97 | ||||
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98 | reduce: <A>(...args: [AccumulatorFn<T, A>, A] | [AccumulatorFn<T, T>]) => _observe<T | A>(({ next, complete, error }) => { | |||
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99 | if (args.length === 1) { | |||
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100 | const [accumulator] = args; | |||
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101 | let _acc: T; | |||
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102 | let index = 0; | |||
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103 | return producer({ | |||
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104 | next: next !== noop ? (v: T) => { | |||
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105 | _acc = index++ === 0 ? v : accumulator(_acc, v); | |||
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106 | } : noop, | |||
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107 | complete: () => { | |||
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108 | if (index === 0) { | |||
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109 | error(new Error("The sequence can't be empty")); | |||
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110 | } else { | |||
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111 | next(_acc); | |||
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112 | complete(); | |||
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113 | } | |||
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114 | }, | |||
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115 | error | |||
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116 | }); | |||
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117 | } else { | |||
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118 | const [accumulator, initial] = args; | |||
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119 | let _acc = initial; | |||
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120 | return producer({ | |||
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121 | next: next !== noop ? (v: T) => { | |||
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122 | _acc = accumulator(_acc, v); | |||
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123 | } : noop, | |||
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124 | complete: () => { | |||
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125 | next(_acc); | |||
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126 | complete(); | |||
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127 | }, | |||
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128 | error | |||
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129 | }); | |||
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130 | } | |||
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131 | }), | |||
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132 | ||||
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133 | cat: (...seq) => _observe(({ next, complete: final, ...rest }) => { | |||
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134 | let cleanup: () => void; | |||
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135 | const len = seq.length; | |||
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136 | const complete = (i: number) => i < len ? | |||
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137 | () => { | |||
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138 | const subscription = seq[i].subscribe({ next, complete: complete(i + 1), ...rest }); | |||
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139 | cleanup = subscription.unsubscribe.bind(subscription); | |||
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140 | } : final; | |||
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141 | ||||
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142 | cleanup = producer({ next, complete: complete(0), ...rest }) ?? noop; | |||
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143 | ||||
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144 | return () => cleanup(); | |||
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145 | }), | |||
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146 | ||||
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147 | pipe: <U>(op: OperatorFn<T, U>) => op(_observe(producer)), | |||
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148 | ||||
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149 | next: collect( | |||
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150 | producer, | |||
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151 | ({ next, complete, error }) => ({ | |||
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152 | next: v => (next(v), complete()), | |||
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153 | complete: () => error(new Error("The sequence is empty")), | |||
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154 | error | |||
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155 | }) | |||
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156 | ), | |||
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157 | ||||
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158 | collect: collect( | |||
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159 | producer, | |||
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160 | ({ next, complete, error }) => { | |||
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161 | const data: T[] = []; | |||
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162 | return { | |||
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163 | next: v => data.push(v), | |||
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164 | complete: () => (next(data), complete()), | |||
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165 | error | |||
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166 | }; | |||
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167 | } | |||
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168 | ) | |||
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169 | } No newline at end of file |
@@ -0,0 +1,153 | |||||
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1 | import { ICancellation } from "@implab/core-amd/interfaces"; | |||
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2 | ||||
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3 | /** | |||
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4 | * The interface for the consumer of an observable sequence | |||
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5 | */ | |||
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6 | export interface Observer<T> { | |||
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7 | /** | |||
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8 | * Called for the next element in the sequence | |||
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9 | */ | |||
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10 | next?(value: T): void; | |||
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11 | ||||
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12 | /** | |||
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13 | * Called once when the error occurs in the sequence. | |||
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14 | */ | |||
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15 | error?(e: unknown): void; | |||
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16 | ||||
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17 | /** | |||
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18 | * Called once at the end of the sequence. | |||
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19 | */ | |||
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20 | complete?(): void; | |||
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21 | } | |||
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22 | ||||
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23 | /** | |||
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24 | * The group of functions to feed an observable. These methods are provided to | |||
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25 | * the producer to generate a stream of events. | |||
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26 | */ | |||
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27 | export type Sink<T> = { | |||
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28 | /** | |||
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29 | * Call to send the next element in the sequence | |||
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30 | */ | |||
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31 | next: (value: T) => void; | |||
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32 | ||||
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33 | /** | |||
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34 | * Call to notify about the error occurred in the sequence. | |||
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35 | */ | |||
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36 | error: (e: unknown) => void; | |||
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37 | ||||
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38 | /** | |||
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39 | * Call to signal the end of the sequence. | |||
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40 | */ | |||
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41 | complete: () => void; | |||
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42 | ||||
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43 | /** | |||
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44 | * Checks whether the sink is accepting new elements. It's safe to | |||
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45 | * send elements to the closed sink. | |||
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46 | */ | |||
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47 | isClosed: () => boolean; | |||
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48 | }; | |||
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49 | ||||
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50 | export type Producer<T> = (sink: Sink<T>) => (void | (() => void)); | |||
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51 | ||||
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52 | export type FusedSink<T> = Omit<Sink<T>, "isClosed">; | |||
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53 | ||||
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54 | export type FusedProducer<T> = (sink: FusedSink<T>) => (void | (() => void)); | |||
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55 | ||||
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56 | export interface Unsubscribable { | |||
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57 | unsubscribe(): void; | |||
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58 | } | |||
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59 | ||||
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60 | export interface Subscribable<T> { | |||
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61 | /** Subscribes a consumer to events. If a consumer isn't specified | |||
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62 | * this method activates the producer to achieve side affects if any. | |||
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63 | */ | |||
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64 | subscribe(consumer?: Observer<T>): Unsubscribable; | |||
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65 | } | |||
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66 | ||||
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67 | export type AccumulatorFn<T, A> = (acc: A, value: T) => A; | |||
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68 | ||||
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69 | export type OperatorFn<T, U> = (source: Observable<T>) => Observable<U>; | |||
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70 | ||||
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71 | /** The observable source of items. */ | |||
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72 | export interface Observable<T> extends Subscribable<T> { | |||
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73 | /** Transforms elements of the sequence with the specified mapper | |||
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74 | * | |||
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75 | * @param mapper The mapper used to transform the values | |||
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76 | */ | |||
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77 | map<T2>(mapper: (value: T) => T2): Observable<T2>; | |||
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78 | ||||
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79 | /** Injects the specified observer into the each producer to consumer chain. | |||
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80 | * The method is used to add side effect to the events processing. | |||
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81 | * | |||
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82 | * @param observer The consumer for the events | |||
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83 | */ | |||
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84 | tap(observer: Observer<T>): Observable<T>; | |||
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85 | ||||
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86 | /** Filters elements of the sequence. The resulting sequence will | |||
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87 | * contain only elements which match the specified predicate. | |||
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88 | * | |||
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89 | * @param predicate The filter predicate. | |||
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90 | */ | |||
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91 | filter(predicate: (value: T) => boolean): Observable<T>; | |||
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92 | ||||
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93 | /** Completes the sequence once the condition is met. | |||
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94 | * @param predicate The condition which should be met to complete the sequence | |||
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95 | */ | |||
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96 | until(predicate: (value: T) => boolean): Observable<T>; | |||
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97 | ||||
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98 | /** Keeps the sequence running while elements satisfy the condition. | |||
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99 | * | |||
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100 | * @param predicate The condition which should be met to continue. | |||
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101 | */ | |||
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102 | while(predicate: (value: T) => boolean): Observable<T>; | |||
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103 | ||||
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104 | /** Applies accumulator to each value in the sequence and | |||
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105 | * emits the accumulated value for each source element | |||
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106 | * | |||
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107 | * @param accumulator | |||
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108 | * @param initial | |||
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109 | */ | |||
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110 | scan<A>(accumulator: AccumulatorFn<T, A>, initial: A): Observable<A>; | |||
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111 | scan(accumulator: AccumulatorFn<T, T>): Observable<T>; | |||
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112 | ||||
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113 | /** Applies accumulator to each value in the sequence and | |||
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114 | * emits the accumulated value at the end of the sequence | |||
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115 | * | |||
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116 | * @param accumulator | |||
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117 | * @param initial | |||
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118 | */ | |||
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119 | reduce<A>(accumulator: AccumulatorFn<T, A>, initial: A): Observable<A>; | |||
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120 | reduce(accumulator: AccumulatorFn<T, T>): Observable<T>; | |||
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121 | ||||
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122 | /** Concatenates the specified sequences with this observable | |||
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123 | * | |||
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124 | * @param seq sequences to concatenate with the current observable | |||
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125 | * | |||
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126 | * The concatenation doesn't accumulate values from the specified sequences, | |||
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127 | * The result of the concatenation is the new observable which will switch | |||
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128 | * to the next observable after the previous one completes. Values emitted | |||
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129 | * before the next observable being active are lost. | |||
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130 | */ | |||
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131 | cat(...seq: Subscribable<T>[]): Observable<T>; | |||
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132 | ||||
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133 | ||||
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134 | /** Pipes the specified operator to produce the new observable | |||
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135 | * @param op The operator consumes this observable and produces a new one | |||
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136 | * | |||
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137 | * The operator is a higher order function which takes a source observable | |||
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138 | * and returns a producer for the new observable. | |||
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139 | * | |||
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140 | * This function can be used to create a complex mapping between source and | |||
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141 | * resulting observables. The operator may have a state (or a side effect) | |||
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142 | * and can be connected to multiple observables. | |||
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143 | */ | |||
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144 | pipe<U>(op: OperatorFn<T, U>): Observable<U>; | |||
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145 | ||||
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146 | /** Waits for the next event to occur and returns a promise for the next value | |||
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147 | * @param ct Cancellation token | |||
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148 | */ | |||
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149 | next(ct?: ICancellation): Promise<T>; | |||
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150 | ||||
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151 | /** Collects items of the sequence to the array. */ | |||
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152 | collect(ct?: ICancellation): Promise<T[]>; | |||
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153 | } No newline at end of file |
@@ -1,429 +1,279 | |||||
1 | import { id as mid} from "module"; |
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1 | import { id as mid} from "module"; | |
2 | import { Cancellation } from "@implab/core-amd/Cancellation"; |
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2 | import { Cancellation } from "@implab/core-amd/Cancellation"; | |
3 | import { ICancellation } from "@implab/core-amd/interfaces"; |
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4 | import { TraceSource } from "@implab/core-amd/log/TraceSource"; |
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3 | import { TraceSource } from "@implab/core-amd/log/TraceSource"; | |
5 | import { isPromise } from "@implab/core-amd/safe"; |
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4 | import { isPromise } from "@implab/core-amd/safe"; | |
6 |
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5 | import { Unsubscribable, Observer, Producer, FusedSink, FusedProducer, AccumulatorFn, Observable, OperatorFn, Subscribable } from "./observable/interfaces"; | ||
7 | const trace = TraceSource.get(mid); |
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8 |
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9 | /** |
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10 | * The interface for the consumer of an observable sequence |
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11 | */ |
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12 | export interface Observer<T> { |
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13 | /** |
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14 | * Called for the next element in the sequence |
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15 | */ |
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16 | next?(value: T): void; |
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17 |
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18 | /** |
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19 | * Called once when the error occurs in the sequence. |
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20 | */ |
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21 | error?(e: unknown): void; |
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22 |
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23 | /** |
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24 | * Called once at the end of the sequence. |
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25 | */ |
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26 | complete?(): void; |
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27 | } |
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28 |
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6 | |||
29 | /** |
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30 | * The group of functions to feed an observable. These methods are provided to |
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31 | * the producer to generate a stream of events. |
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32 | */ |
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33 | export type Sink<T> = { |
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34 | /** |
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35 | * Call to send the next element in the sequence |
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36 | */ |
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37 | next: (value: T) => void; |
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38 |
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7 | |||
39 | /** |
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40 | * Call to notify about the error occurred in the sequence. |
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41 | */ |
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42 | error: (e: unknown) => void; |
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43 |
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44 | /** |
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45 | * Call to signal the end of the sequence. |
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46 | */ |
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47 | complete: () => void; |
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48 |
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49 | /** |
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50 | * Checks whether the sink is accepting new elements. It's safe to |
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51 | * send elements to the closed sink. |
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52 | */ |
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53 | isClosed: () => boolean; |
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54 | }; |
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55 |
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56 | export type Producer<T> = (sink: Sink<T>) => (void | (() => void)); |
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57 |
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58 | type FusedSink<T> = Omit<Sink<T>, "isClosed">; |
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59 |
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60 | type FusedProducer<T> = (sink: FusedSink<T>) => (void | (() => void)); |
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61 |
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62 | export interface Unsubscribable { |
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63 | unsubscribe(): void; |
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64 | } |
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65 |
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8 | |||
66 | export const isUnsubscribable = (v: unknown): v is Unsubscribable => |
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9 | export const isUnsubscribable = (v: unknown): v is Unsubscribable => | |
67 | v !== null && v !== undefined && typeof (v as Unsubscribable).unsubscribe === "function"; |
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10 | v !== null && v !== undefined && typeof (v as Unsubscribable).unsubscribe === "function"; | |
68 |
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11 | |||
69 | export const isSubscribable = <T = unknown>(v: unknown): v is Subscribable<T> => |
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12 | export const isSubscribable = <T = unknown>(v: unknown): v is Subscribable<T> => | |
70 | v !== null && v !== undefined && typeof (v as Subscribable<unknown>).subscribe === "function"; |
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13 | v !== null && v !== undefined && typeof (v as Subscribable<unknown>).subscribe === "function"; | |
71 |
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14 | |||
72 | export interface Subscribable<T> { |
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73 | /** Subscribes a consumer to events. If a consumer isn't specified |
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74 | * this method activates the producer to achieve side affects if any. |
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75 | */ |
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76 | subscribe(consumer?: Observer<T>): Unsubscribable; |
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77 | } |
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78 |
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15 | |||
79 | export type AccumulatorFn<T, A> = (acc: A, value: T) => A; |
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80 |
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81 | export type OperatorFn<T, U> = (source: Observable<T>) => Observable<U>; |
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82 |
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83 | /** The observable source of items. */ |
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84 | export interface Observable<T> extends Subscribable<T> { |
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85 | /** Transforms elements of the sequence with the specified mapper |
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86 | * |
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87 | * @param mapper The mapper used to transform the values |
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88 | */ |
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89 | map<T2>(mapper: (value: T) => T2): Observable<T2>; |
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90 |
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91 | /** Injects the specified observer into the each producer to consumer chain. |
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92 | * The method is used to add side effect to the events processing. |
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93 | * |
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94 | * @param observer The consumer for the events |
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95 | */ |
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96 | tap(observer: Observer<T>): Observable<T>; |
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97 |
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98 | /** Filters elements of the sequence. The resulting sequence will |
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99 | * contain only elements which match the specified predicate. |
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100 | * |
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101 | * @param predicate The filter predicate. |
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102 | */ |
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103 | filter(predicate: (value: T) => boolean): Observable<T>; |
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104 |
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105 | /** Completes the sequence once the condition is met. |
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106 | * @param predicate The condition which should be met to complete the sequence |
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107 | */ |
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108 | until(predicate: (value: T) => boolean): Observable<T>; |
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109 |
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110 | /** Keeps the sequence running while elements satisfy the condition. |
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111 | * |
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112 | * @param predicate The condition which should be met to continue. |
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113 | */ |
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114 | while(predicate: (value: T) => boolean): Observable<T>; |
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115 |
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116 | /** Applies accumulator to each value in the sequence and |
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117 | * emits the accumulated value for each source element |
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118 | * |
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119 | * @param accumulator |
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120 | * @param initial |
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121 | */ |
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122 | scan<A>(accumulator: AccumulatorFn<T, A>, initial: A): Observable<A>; |
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123 | scan(accumulator: AccumulatorFn<T, T>): Observable<T>; |
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124 |
|
||||
125 | /** Applies accumulator to each value in the sequence and |
|
|||
126 | * emits the accumulated value at the end of the sequence |
|
|||
127 | * |
|
|||
128 | * @param accumulator |
|
|||
129 | * @param initial |
|
|||
130 | */ |
|
|||
131 | reduce<A>(accumulator: AccumulatorFn<T, A>, initial: A): Observable<A>; |
|
|||
132 | reduce(accumulator: AccumulatorFn<T, T>): Observable<T>; |
|
|||
133 |
|
||||
134 | /** Concatenates the specified sequences with this observable |
|
|||
135 | * |
|
|||
136 | * @param seq sequences to concatenate with the current observable |
|
|||
137 | * |
|
|||
138 | * The concatenation doesn't accumulate values from the specified sequences, |
|
|||
139 | * The result of the concatenation is the new observable which will switch |
|
|||
140 | * to the next observable after the previous one completes. Values emitted |
|
|||
141 | * before the next observable being active are lost. |
|
|||
142 | */ |
|
|||
143 | cat(...seq: Subscribable<T>[]): Observable<T>; |
|
|||
144 |
|
||||
145 |
|
||||
146 | /** Pipes the specified operator to produce the new observable |
|
|||
147 | * @param op The operator consumes this observable and produces a new one |
|
|||
148 | * |
|
|||
149 | * The operator is a higher order function which takes a source observable |
|
|||
150 | * and returns a producer for the new observable. |
|
|||
151 | * |
|
|||
152 | * This function can be used to create a complex mapping between source and |
|
|||
153 | * resulting observables. The operator may have a state (or a side effect) |
|
|||
154 | * and can be connected to multiple observables. |
|
|||
155 | */ |
|
|||
156 | pipe<U>(op: OperatorFn<T, U>): Observable<U>; |
|
|||
157 |
|
||||
158 | /** Waits for the next event to occur and returns a promise for the next value |
|
|||
159 | * @param ct Cancellation token |
|
|||
160 | */ |
|
|||
161 | next(ct?: ICancellation): Promise<T>; |
|
|||
162 |
|
||||
163 | /** Collects items of the sequence to the array. */ |
|
|||
164 | collect(ct?: ICancellation): Promise<T[]>; |
|
|||
165 | } |
|
|||
166 |
|
16 | |||
167 | const noop = () => { }; |
|
17 | const noop = () => { }; | |
168 |
|
18 | |||
169 | const errorFallback = (e: unknown) => trace.error("Unhandled observable error: {0}", e); |
|
19 | ||
170 |
|
20 | |||
171 | const sink = <T>(consumer: Observer<T>) => { |
|
21 | const sink = <T>(consumer: Observer<T>) => { | |
172 | // eslint-disable-next-line @typescript-eslint/unbound-method |
|
22 | // eslint-disable-next-line @typescript-eslint/unbound-method | |
173 | const { next, error, complete } = consumer; |
|
23 | const { next, error, complete } = consumer; | |
174 | return { |
|
24 | return { | |
175 | next: next ? next.bind(consumer) : noop, |
|
25 | next: next ? next.bind(consumer) : noop, | |
176 | error: error ? error.bind(consumer) : errorFallback, // report unhandled errors |
|
26 | error: error ? error.bind(consumer) : errorFallback, // report unhandled errors | |
177 | complete: complete ? complete.bind(consumer) : noop |
|
27 | complete: complete ? complete.bind(consumer) : noop | |
178 | }; |
|
28 | }; | |
179 | }; |
|
29 | }; | |
180 |
|
30 | |||
181 | /** Wraps the producer to handle tear down logic and subscription management |
|
31 | /** Wraps the producer to handle tear down logic and subscription management | |
182 | * |
|
32 | * | |
183 | * The resulting producer will invoke cleanup logic on error or complete events |
|
33 | * The resulting producer will invoke cleanup logic on error or complete events | |
184 | * and will prevent calling of any method from the sink. |
|
34 | * and will prevent calling of any method from the sink. | |
185 | * |
|
35 | * | |
186 | * @param producer The producer to wrap |
|
36 | * @param producer The producer to wrap | |
187 | * @returns The wrapper producer |
|
37 | * @returns The wrapper producer | |
188 | */ |
|
38 | */ | |
189 | const fuse = <T>(producer: Producer<T>) => ({ next, error, complete }: FusedSink<T>) => { |
|
39 | const fuse = <T>(producer: Producer<T>) => ({ next, error, complete }: FusedSink<T>) => { | |
190 | let done = false; |
|
40 | let done = false; | |
191 | let cleanup = noop; |
|
41 | let cleanup = noop; | |
192 |
|
42 | |||
193 | const _fin = <A extends unknown[]>(fn: (...args: A) => void) => |
|
43 | const _fin = <A extends unknown[]>(fn: (...args: A) => void) => | |
194 | (...args: A) => done ? |
|
44 | (...args: A) => done ? | |
195 | void (0) : |
|
45 | void (0) : | |
196 | (done = true, cleanup(), fn(...args)); |
|
46 | (done = true, cleanup(), fn(...args)); | |
197 |
|
47 | |||
198 | const _fin0 = () => done ? void (0) : (done = true, cleanup()); |
|
48 | const _fin0 = () => done ? void (0) : (done = true, cleanup()); | |
199 |
|
49 | |||
200 | const safeSink = { |
|
50 | const safeSink = { | |
201 | next: (value: T) => { !done && next(value); }, |
|
51 | next: (value: T) => { !done && next(value); }, | |
202 | error: _fin(error), |
|
52 | error: _fin(error), | |
203 | complete: _fin(complete), |
|
53 | complete: _fin(complete), | |
204 | isClosed: () => done |
|
54 | isClosed: () => done | |
205 | }; |
|
55 | }; | |
206 | // call the producer |
|
56 | // call the producer | |
207 | cleanup = producer(safeSink) ?? noop; |
|
57 | cleanup = producer(safeSink) ?? noop; | |
208 | // if the producer throws exception bypass it to the caller rather then to |
|
58 | // if the producer throws exception bypass it to the caller rather then to | |
209 | // the sink. This is a feature. |
|
59 | // the sink. This is a feature. | |
210 |
|
60 | |||
211 | // if the producer completed the sequence immediately call the cleanup in place |
|
61 | // if the producer completed the sequence immediately call the cleanup in place | |
212 | return done ? cleanup() : _fin0; |
|
62 | return done ? cleanup() : _fin0; | |
213 | }; |
|
63 | }; | |
214 |
|
64 | |||
215 | const _observe = <T>(producer: FusedProducer<T>): Observable<T> => ({ |
|
65 | const _observe = <T>(producer: FusedProducer<T>): Observable<T> => ({ | |
216 | subscribe: (consumer: Observer<T> = {}) => ({ |
|
66 | subscribe: (consumer: Observer<T> = {}) => ({ | |
217 | unsubscribe: producer(sink(consumer)) ?? noop |
|
67 | unsubscribe: producer(sink(consumer)) ?? noop | |
218 | }), |
|
68 | }), | |
219 |
|
69 | |||
220 | map: (mapper) => _observe(({ next, ...rest }) => |
|
70 | map: (mapper) => _observe(({ next, ...rest }) => | |
221 | producer({ |
|
71 | producer({ | |
222 | next: next !== noop ? (v: T) => next(mapper(v)) : noop, |
|
72 | next: next !== noop ? (v: T) => next(mapper(v)) : noop, | |
223 | ...rest |
|
73 | ...rest | |
224 | }) |
|
74 | }) | |
225 | ), |
|
75 | ), | |
226 |
|
76 | |||
227 | tap: ({next: tapNext, complete: tapComplete, error: tapError}) => _observe(({next,complete, error}) => |
|
77 | tap: ({next: tapNext, complete: tapComplete, error: tapError}) => _observe(({next,complete, error}) => | |
228 | producer({ |
|
78 | producer({ | |
229 | next: tapNext ? (v => (tapNext(v), next(v))) : next, |
|
79 | next: tapNext ? (v => (tapNext(v), next(v))) : next, | |
230 | complete: tapComplete ? (() => (tapComplete(), complete())): complete, |
|
80 | complete: tapComplete ? (() => (tapComplete(), complete())): complete, | |
231 | error: tapError ? (e => (tapError(e), error(e))) : error |
|
81 | error: tapError ? (e => (tapError(e), error(e))) : error | |
232 | }) |
|
82 | }) | |
233 | ), |
|
83 | ), | |
234 |
|
84 | |||
235 | filter: (predicate) => _observe(({ next, ...rest }) => |
|
85 | filter: (predicate) => _observe(({ next, ...rest }) => | |
236 | producer({ |
|
86 | producer({ | |
237 | next: next !== noop ? (v: T) => predicate(v) ? next(v) : void (0) : noop, |
|
87 | next: next !== noop ? (v: T) => predicate(v) ? next(v) : void (0) : noop, | |
238 | ...rest |
|
88 | ...rest | |
239 | }) |
|
89 | }) | |
240 | ), |
|
90 | ), | |
241 |
|
91 | |||
242 | until: predicate => _observe(({ next, complete, ...rest }) => |
|
92 | until: predicate => _observe(({ next, complete, ...rest }) => | |
243 | producer({ |
|
93 | producer({ | |
244 | next: v => predicate(v) ? complete() : next(v), |
|
94 | next: v => predicate(v) ? complete() : next(v), | |
245 | complete, |
|
95 | complete, | |
246 | ...rest |
|
96 | ...rest | |
247 | }) |
|
97 | }) | |
248 | ), |
|
98 | ), | |
249 |
|
99 | |||
250 | while: predicate => _observe(({ next, complete, ...rest }) => |
|
100 | while: predicate => _observe(({ next, complete, ...rest }) => | |
251 | producer({ |
|
101 | producer({ | |
252 | next: v => predicate(v) ? next(v) : complete(), |
|
102 | next: v => predicate(v) ? next(v) : complete(), | |
253 | complete, |
|
103 | complete, | |
254 | ...rest |
|
104 | ...rest | |
255 | }) |
|
105 | }) | |
256 | ), |
|
106 | ), | |
257 |
|
107 | |||
258 | scan: <A>(...args: [AccumulatorFn<T, A>, A] | [AccumulatorFn<T, T>]) => _observe<T | A>(({ next, ...rest }) => { |
|
108 | scan: <A>(...args: [AccumulatorFn<T, A>, A] | [AccumulatorFn<T, T>]) => _observe<T | A>(({ next, ...rest }) => { | |
259 | if (args.length === 1) { |
|
109 | if (args.length === 1) { | |
260 | const [accumulator] = args; |
|
110 | const [accumulator] = args; | |
261 | let _acc: T; |
|
111 | let _acc: T; | |
262 | let index = 0; |
|
112 | let index = 0; | |
263 | return producer({ |
|
113 | return producer({ | |
264 | next: next !== noop ? (v: T) => next(index++ === 0 ? _acc = v : _acc = accumulator(_acc, v)) : noop, |
|
114 | next: next !== noop ? (v: T) => next(index++ === 0 ? _acc = v : _acc = accumulator(_acc, v)) : noop, | |
265 | ...rest |
|
115 | ...rest | |
266 | }); |
|
116 | }); | |
267 | } else { |
|
117 | } else { | |
268 | const [accumulator, initial] = args; |
|
118 | const [accumulator, initial] = args; | |
269 | let _acc = initial; |
|
119 | let _acc = initial; | |
270 | return producer({ |
|
120 | return producer({ | |
271 | next: next !== noop ? (v: T) => next(_acc = accumulator(_acc, v)) : noop, |
|
121 | next: next !== noop ? (v: T) => next(_acc = accumulator(_acc, v)) : noop, | |
272 | ...rest |
|
122 | ...rest | |
273 | }); |
|
123 | }); | |
274 | } |
|
124 | } | |
275 | }), |
|
125 | }), | |
276 |
|
126 | |||
277 | reduce: <A>(...args: [AccumulatorFn<T, A>, A] | [AccumulatorFn<T, T>]) => _observe<T | A>(({ next, complete, error }) => { |
|
127 | reduce: <A>(...args: [AccumulatorFn<T, A>, A] | [AccumulatorFn<T, T>]) => _observe<T | A>(({ next, complete, error }) => { | |
278 | if (args.length === 1) { |
|
128 | if (args.length === 1) { | |
279 | const [accumulator] = args; |
|
129 | const [accumulator] = args; | |
280 | let _acc: T; |
|
130 | let _acc: T; | |
281 | let index = 0; |
|
131 | let index = 0; | |
282 | return producer({ |
|
132 | return producer({ | |
283 | next: next !== noop ? (v: T) => { |
|
133 | next: next !== noop ? (v: T) => { | |
284 | _acc = index++ === 0 ? v : accumulator(_acc, v); |
|
134 | _acc = index++ === 0 ? v : accumulator(_acc, v); | |
285 | } : noop, |
|
135 | } : noop, | |
286 | complete: () => { |
|
136 | complete: () => { | |
287 | if (index === 0) { |
|
137 | if (index === 0) { | |
288 | error(new Error("The sequence can't be empty")); |
|
138 | error(new Error("The sequence can't be empty")); | |
289 | } else { |
|
139 | } else { | |
290 | next(_acc); |
|
140 | next(_acc); | |
291 | complete(); |
|
141 | complete(); | |
292 | } |
|
142 | } | |
293 | }, |
|
143 | }, | |
294 | error |
|
144 | error | |
295 | }); |
|
145 | }); | |
296 | } else { |
|
146 | } else { | |
297 | const [accumulator, initial] = args; |
|
147 | const [accumulator, initial] = args; | |
298 | let _acc = initial; |
|
148 | let _acc = initial; | |
299 | return producer({ |
|
149 | return producer({ | |
300 | next: next !== noop ? (v: T) => { |
|
150 | next: next !== noop ? (v: T) => { | |
301 | _acc = accumulator(_acc, v); |
|
151 | _acc = accumulator(_acc, v); | |
302 | } : noop, |
|
152 | } : noop, | |
303 | complete: () => { |
|
153 | complete: () => { | |
304 | next(_acc); |
|
154 | next(_acc); | |
305 | complete(); |
|
155 | complete(); | |
306 | }, |
|
156 | }, | |
307 | error |
|
157 | error | |
308 | }); |
|
158 | }); | |
309 | } |
|
159 | } | |
310 | }), |
|
160 | }), | |
311 |
|
161 | |||
312 | cat: (...seq) => _observe(({ next, complete: final, ...rest }) => { |
|
162 | cat: (...seq) => _observe(({ next, complete: final, ...rest }) => { | |
313 | let cleanup: () => void; |
|
163 | let cleanup: () => void; | |
314 | const len = seq.length; |
|
164 | const len = seq.length; | |
315 | const complete = (i: number) => i < len ? |
|
165 | const complete = (i: number) => i < len ? | |
316 | () => { |
|
166 | () => { | |
317 | const subscription = seq[i].subscribe({ next, complete: complete(i + 1), ...rest }); |
|
167 | const subscription = seq[i].subscribe({ next, complete: complete(i + 1), ...rest }); | |
318 | cleanup = subscription.unsubscribe.bind(subscription); |
|
168 | cleanup = subscription.unsubscribe.bind(subscription); | |
319 | } : final; |
|
169 | } : final; | |
320 |
|
170 | |||
321 | cleanup = producer({ next, complete: complete(0), ...rest }) ?? noop; |
|
171 | cleanup = producer({ next, complete: complete(0), ...rest }) ?? noop; | |
322 |
|
172 | |||
323 | return () => cleanup(); |
|
173 | return () => cleanup(); | |
324 | }), |
|
174 | }), | |
325 |
|
175 | |||
326 | pipe: <U>(op: OperatorFn<T, U>) => op(_observe(producer)), |
|
176 | pipe: <U>(op: OperatorFn<T, U>) => op(_observe(producer)), | |
327 |
|
177 | |||
328 | next: collect( |
|
178 | next: collect( | |
329 | producer, |
|
179 | producer, | |
330 | ({ next, complete, error }) => ({ |
|
180 | ({ next, complete, error }) => ({ | |
331 | next: v => (next(v), complete()), |
|
181 | next: v => (next(v), complete()), | |
332 | complete: () => error(new Error("The sequence is empty")), |
|
182 | complete: () => error(new Error("The sequence is empty")), | |
333 | error |
|
183 | error | |
334 | }) |
|
184 | }) | |
335 | ), |
|
185 | ), | |
336 |
|
186 | |||
337 | collect: collect( |
|
187 | collect: collect( | |
338 | producer, |
|
188 | producer, | |
339 | ({ next, complete, error}) => { |
|
189 | ({ next, complete, error}) => { | |
340 | const data: T[] = []; |
|
190 | const data: T[] = []; | |
341 | return { |
|
191 | return { | |
342 | next: v => data.push(v), |
|
192 | next: v => data.push(v), | |
343 | complete: () => (next(data), complete()), |
|
193 | complete: () => (next(data), complete()), | |
344 | error |
|
194 | error | |
345 | }; |
|
195 | }; | |
346 | } |
|
196 | } | |
347 | ) |
|
197 | ) | |
348 | }); |
|
198 | }); | |
349 |
|
199 | |||
350 | const collect = <T, U>( |
|
200 | const collect = <T, U>( | |
351 | producer: FusedProducer<T>, |
|
201 | producer: FusedProducer<T>, | |
352 | collector: (result: FusedSink<U>) => FusedSink<T> |
|
202 | collector: (result: FusedSink<U>) => FusedSink<T> | |
353 | ) => (ct = Cancellation.none) => new Promise<U>((resolve, reject) => { |
|
203 | ) => (ct = Cancellation.none) => new Promise<U>((resolve, reject) => { | |
354 | const fused = fuse<U>(({ next, complete, error, isClosed }) => { |
|
204 | const fused = fuse<U>(({ next, complete, error, isClosed }) => { | |
355 | const h = ct.register(error); |
|
205 | const h = ct.register(error); | |
356 | const cleanup = !isClosed() ? |
|
206 | const cleanup = !isClosed() ? | |
357 | producer(collector({ next, complete, error })) ?? noop : |
|
207 | producer(collector({ next, complete, error })) ?? noop : | |
358 | noop; |
|
208 | noop; | |
359 |
|
209 | |||
360 | return () => { |
|
210 | return () => { | |
361 | h.destroy(); |
|
211 | h.destroy(); | |
362 | cleanup(); |
|
212 | cleanup(); | |
363 | }; |
|
213 | }; | |
364 | }); |
|
214 | }); | |
365 |
|
215 | |||
366 | fused({ |
|
216 | fused({ | |
367 | next: resolve, |
|
217 | next: resolve, | |
368 | error: reject, |
|
218 | error: reject, | |
369 | complete: noop |
|
219 | complete: noop | |
370 | }); |
|
220 | }); | |
371 | }); |
|
221 | }); | |
372 |
|
222 | |||
373 | export const observe = <T>(producer: Producer<T>) => _observe(fuse(producer)); |
|
223 | export const observe = <T>(producer: Producer<T>) => _observe(fuse(producer)); | |
374 |
|
224 | |||
375 | /** Converts an array to the observable sequence of its elements. */ |
|
225 | /** Converts an array to the observable sequence of its elements. */ | |
376 | export const ofArray = <T>(items: T[]) => _observe<T>( |
|
226 | export const ofArray = <T>(items: T[]) => _observe<T>( | |
377 | ({ next, complete }) => ( |
|
227 | ({ next, complete }) => ( | |
378 | items.forEach(next), |
|
228 | items.forEach(next), | |
379 | complete() |
|
229 | complete() | |
380 | ) |
|
230 | ) | |
381 | ); |
|
231 | ); | |
382 |
|
232 | |||
383 | /** Converts a subscribable to the observable */ |
|
233 | /** Converts a subscribable to the observable */ | |
384 | export const ofSubscribable = <T>(subscribable: Subscribable<T>) => |
|
234 | export const ofSubscribable = <T>(subscribable: Subscribable<T>) => | |
385 | observe<T>(sink => { |
|
235 | observe<T>(sink => { | |
386 | const subscription = subscribable.subscribe(sink); |
|
236 | const subscription = subscribable.subscribe(sink); | |
387 | return () => subscription.unsubscribe(); |
|
237 | return () => subscription.unsubscribe(); | |
388 | }); |
|
238 | }); | |
389 |
|
239 | |||
390 | const of1 = <T>(item: T | PromiseLike<T>) => observe<T>( |
|
240 | const of1 = <T>(item: T | PromiseLike<T>) => observe<T>( | |
391 | ({ next, error, complete }) => |
|
241 | ({ next, error, complete }) => | |
392 | isPromise(item) ? |
|
242 | isPromise(item) ? | |
393 | void item.then( |
|
243 | void item.then( | |
394 | v => (next(v), complete()), |
|
244 | v => (next(v), complete()), | |
395 | error |
|
245 | error | |
396 | ) : |
|
246 | ) : | |
397 | (next(item), complete()) |
|
247 | (next(item), complete()) | |
398 | ); |
|
248 | ); | |
399 |
|
249 | |||
400 | /** Converts a list of parameter values to the observable sequence. The |
|
250 | /** Converts a list of parameter values to the observable sequence. The | |
401 | * order of elements in the list will be preserved in the resulting sequence. |
|
251 | * order of elements in the list will be preserved in the resulting sequence. | |
402 | */ |
|
252 | */ | |
403 | export const of = <T>(...items: (T | PromiseLike<T>)[]) => items.length === 1 ? |
|
253 | export const of = <T>(...items: (T | PromiseLike<T>)[]) => items.length === 1 ? | |
404 | of1(items[0]) : |
|
254 | of1(items[0]) : | |
405 | observe<T>( |
|
255 | observe<T>( | |
406 | ({ next, error, complete, isClosed }) => { |
|
256 | ({ next, error, complete, isClosed }) => { | |
407 | const n = items.length; |
|
257 | const n = items.length; | |
408 |
|
258 | |||
409 | const _next = (start: number) => { |
|
259 | const _next = (start: number) => { | |
410 | if (start > 0 && isClosed()) // when resumed |
|
260 | if (start > 0 && isClosed()) // when resumed | |
411 | return; |
|
261 | return; | |
412 |
|
262 | |||
413 | for (let i = start; i < n; i++) { |
|
263 | for (let i = start; i < n; i++) { | |
414 | const r = items[i]; |
|
264 | const r = items[i]; | |
415 | if (isPromise(r)) { |
|
265 | if (isPromise(r)) { | |
416 | r.then(v => (next(v), _next(i + 1)), error); |
|
266 | r.then(v => (next(v), _next(i + 1)), error); | |
417 | return; // suspend |
|
267 | return; // suspend | |
418 | } else { |
|
268 | } else { | |
419 | next(r); |
|
269 | next(r); | |
420 | } |
|
270 | } | |
421 | } |
|
271 | } | |
422 | complete(); |
|
272 | complete(); | |
423 | }; |
|
273 | }; | |
424 |
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274 | |||
425 | _next(0); |
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275 | _next(0); | |
426 | } |
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276 | } | |
427 | ); |
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277 | ); | |
428 |
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278 | |||
429 | export const empty = _observe<never>(({ complete }) => complete()); |
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279 | export const empty = _observe<never>(({ complete }) => complete()); |
1 | NO CONTENT: modified file |
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NO CONTENT: modified file | ||
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