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transform: Automatically read() on _write when read buffer is empty

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isaacs 2012-10-04 16:58:43 -07:00
parent 3b59fd70f4
commit caa853bb06
1 changed files with 15 additions and 1 deletions
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16
lib/_stream_transform.js
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@ -110,14 +110,28 @@ Transform.prototype._transform = function(chunk, output, cb) {
Transform.prototype._write = function(chunk, cb) { Transform.prototype._write = function(chunk, cb) {
var ts = this._transformState; var ts = this._transformState;
var rs = this._readableState;
ts.buffer.push([chunk, cb]); ts.buffer.push([chunk, cb]);
// no need for auto-pull if already in the midst of one.
if (ts.transforming)
return;
// now we have something to transform, if we were waiting for it. // now we have something to transform, if we were waiting for it.
if (ts.pendingReadCb && !ts.transforming) { // kick off a _read to pull it in.
if (ts.pendingReadCb) {
var readcb = ts.pendingReadCb; var readcb = ts.pendingReadCb;
ts.pendingReadCb = null; ts.pendingReadCb = null;
this._read(-1, readcb); this._read(-1, readcb);
} }
// if we weren't waiting for it, but nothing is queued up, then
// still kick off a transform, just so it's there when the user asks.
if (rs.length === 0) {
var ret = this.read();
if (ret !== null)
return cb(new Error('invalid stream transform state'));
}
}; };
Transform.prototype._read = function(n, readcb) { Transform.prototype._read = function(n, readcb) {