77 lines
1.6 KiB
JavaScript
77 lines
1.6 KiB
JavaScript
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"use strict";
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var stream = require("stream");
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function DuplexWrapper(options, writable, readable) {
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if (typeof readable === "undefined") {
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readable = writable;
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writable = options;
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options = null;
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}
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stream.Duplex.call(this, options);
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if (typeof readable.read !== "function") {
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readable = (new stream.Readable(options)).wrap(readable);
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}
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this._writable = writable;
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this._readable = readable;
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this._waiting = false;
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var self = this;
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writable.once("finish", function() {
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self.end();
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});
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this.once("finish", function() {
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writable.end();
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});
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readable.on("readable", function() {
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if (self._waiting) {
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self._waiting = false;
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self._read();
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}
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});
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readable.once("end", function() {
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self.push(null);
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});
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if (!options || typeof options.bubbleErrors === "undefined" || options.bubbleErrors) {
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writable.on("error", function(err) {
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self.emit("error", err);
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});
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readable.on("error", function(err) {
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self.emit("error", err);
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});
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}
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}
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DuplexWrapper.prototype = Object.create(stream.Duplex.prototype, {constructor: {value: DuplexWrapper}});
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DuplexWrapper.prototype._write = function _write(input, encoding, done) {
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this._writable.write(input, encoding, done);
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};
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DuplexWrapper.prototype._read = function _read() {
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var buf;
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var reads = 0;
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while ((buf = this._readable.read()) !== null) {
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this.push(buf);
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reads++;
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}
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if (reads === 0) {
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this._waiting = true;
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}
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};
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module.exports = function duplex2(options, writable, readable) {
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return new DuplexWrapper(options, writable, readable);
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};
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module.exports.DuplexWrapper = DuplexWrapper;
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