| 92 | } |
| 93 | |
| 94 | async function pump() { |
| 95 | try { |
| 96 | for await (let val of stream) { |
| 97 | if (done) { |
| 98 | return; |
| 99 | } |
| 100 | |
| 101 | if (signal.aborted) { |
| 102 | throw new AbortError(); |
| 103 | } |
| 104 | |
| 105 | try { |
| 106 | val = fn(val, signalOpt); |
| 107 | |
| 108 | if (val === kEmpty) { |
| 109 | continue; |
| 110 | } |
| 111 | |
| 112 | val = PromiseResolve(val); |
| 113 | } catch (err) { |
| 114 | val = PromiseReject(err); |
| 115 | } |
| 116 | |
| 117 | cnt += 1; |
| 118 | |
| 119 | PromisePrototypeThen(val, afterItemProcessed, onCatch); |
| 120 | |
| 121 | queue.push(val); |
| 122 | if (next) { |
| 123 | next(); |
| 124 | next = null; |
| 125 | } |
| 126 | |
| 127 | if (!done && (queue.length >= highWaterMark || cnt >= concurrency)) { |
| 128 | await new Promise((resolve) => { |
| 129 | resume = resolve; |
| 130 | }); |
| 131 | } |
| 132 | } |
| 133 | queue.push(kEof); |
| 134 | } catch (err) { |
| 135 | const val = PromiseReject(err); |
| 136 | PromisePrototypeThen(val, afterItemProcessed, onCatch); |
| 137 | queue.push(val); |
| 138 | } finally { |
| 139 | done = true; |
| 140 | if (next) { |
| 141 | next(); |
| 142 | next = null; |
| 143 | } |
| 144 | } |
| 145 | } |
| 146 | |
| 147 | pump(); |
| 148 | |