100 lines
2.4 KiB
JavaScript
100 lines
2.4 KiB
JavaScript
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'use strict';
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var si = require('set-immediate-shim');
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var stream = require('readable-stream');
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var util = require('util');
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var Readable = stream.Readable;
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module.exports = ReaddirpReadable;
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util.inherits(ReaddirpReadable, Readable);
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function ReaddirpReadable (opts) {
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if (!(this instanceof ReaddirpReadable)) return new ReaddirpReadable(opts);
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opts = opts || {};
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opts.objectMode = true;
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Readable.call(this, opts);
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// backpressure not implemented at this point
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this.highWaterMark = Infinity;
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this._destroyed = false;
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this._paused = false;
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this._warnings = [];
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this._errors = [];
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this._pauseResumeErrors();
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}
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var proto = ReaddirpReadable.prototype;
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proto._pauseResumeErrors = function () {
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var self = this;
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self.on('pause', function () { self._paused = true });
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self.on('resume', function () {
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if (self._destroyed) return;
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self._paused = false;
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self._warnings.forEach(function (err) { self.emit('warn', err) });
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self._warnings.length = 0;
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self._errors.forEach(function (err) { self.emit('error', err) });
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self._errors.length = 0;
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})
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}
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// called for each entry
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proto._processEntry = function (entry) {
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if (this._destroyed) return;
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this.push(entry);
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}
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proto._read = function () { }
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proto.destroy = function () {
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// when stream is destroyed it will emit nothing further, not even errors or warnings
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this.push(null);
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this.readable = false;
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this._destroyed = true;
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this.emit('close');
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}
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proto._done = function () {
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this.push(null);
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}
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// we emit errors and warnings async since we may handle errors like invalid args
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// within the initial event loop before any event listeners subscribed
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proto._handleError = function (err) {
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var self = this;
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si(function () {
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if (self._paused) return self._warnings.push(err);
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if (!self._destroyed) self.emit('warn', err);
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});
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}
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proto._handleFatalError = function (err) {
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var self = this;
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si(function () {
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if (self._paused) return self._errors.push(err);
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if (!self._destroyed) self.emit('error', err);
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});
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}
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function createStreamAPI () {
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var stream = new ReaddirpReadable();
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return {
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stream : stream
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, processEntry : stream._processEntry.bind(stream)
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, done : stream._done.bind(stream)
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, handleError : stream._handleError.bind(stream)
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, handleFatalError : stream._handleFatalError.bind(stream)
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};
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}
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module.exports = createStreamAPI;
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