| 1 |
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| 2 |
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| 3 | //a pass through stream that doesn't change the value.
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| 4 | module.exports = function through (op, onEnd) {
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| 5 | var a = false
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| 6 |
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| 7 | function once (abort) {
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| 8 | if(a || !onEnd) return
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| 9 | a = true
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| 10 | onEnd(abort === true ? null : abort)
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| 11 | }
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| 12 |
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| 13 | return function (read) {
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| 14 | return function (end, cb) {
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| 15 | if(end) once(end)
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| 16 | return read(end, function (end, data) {
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| 17 | if(!end) op && op(data)
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| 18 | else once(end)
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| 19 | cb(end, data)
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| 20 | })
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| 21 | }
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| 22 | }
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| 23 | }
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