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59 lines
1.0 KiB
59 lines
1.0 KiB
var eos = require('end-of-stream') |
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var shift = require('stream-shift') |
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module.exports = each |
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function each (stream, fn, cb) { |
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var want = true |
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var error = null |
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var ended = false |
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var running = false |
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var calling = false |
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stream.on('readable', onreadable) |
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onreadable() |
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if (cb) eos(stream, {readable: true, writable: false}, done) |
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return stream |
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function done (err) { |
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if (!error) error = err |
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ended = true |
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if (!running) cb(error) |
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} |
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function onreadable () { |
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if (want) read() |
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} |
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function afterRead (err) { |
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running = false |
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if (err) { |
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error = err |
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if (ended) return cb(error) |
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stream.destroy(err) |
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return |
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} |
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if (ended) return cb(error) |
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if (!calling) read() |
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} |
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function read () { |
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while (!running && !ended) { |
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want = false |
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var data = shift(stream) |
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if (ended) return |
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if (data === null) { |
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want = true |
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return |
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} |
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running = true |
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calling = true |
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fn(data, afterRead) |
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calling = false |
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} |
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} |
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}
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