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files >> //proc/thread-self/root/proc/self/root/lib/node_modules/npm/node_modules/byline/lib/byline.js
// Copyright (C) 2011-2015 John Hewson // // Permission is hereby granted, free of charge, to any person obtaining a copy // of this software and associated documentation files (the "Software"), to // deal in the Software without restriction, including without limitation the // rights to use, copy, modify, merge, publish, distribute, sublicense, and/or // sell copies of the Software, and to permit persons to whom the Software is // furnished to do so, subject to the following conditions: // // The above copyright notice and this permission notice shall be included in // all copies or substantial portions of the Software. // // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS // IN THE SOFTWARE. var stream = require('stream'), util = require('util'), timers = require('timers'); // convinience API module.exports = function(readStream, options) { return module.exports.createStream(readStream, options); }; // basic API module.exports.createStream = function(readStream, options) { if (readStream) { return createLineStream(readStream, options); } else { return new LineStream(options); } }; // deprecated API module.exports.createLineStream = function(readStream) { console.log('WARNING: byline#createLineStream is deprecated and will be removed soon'); return createLineStream(readStream); }; function createLineStream(readStream, options) { if (!readStream) { throw new Error('expected readStream'); } if (!readStream.readable) { throw new Error('readStream must be readable'); } var ls = new LineStream(options); readStream.pipe(ls); return ls; } // // using the new node v0.10 "streams2" API // module.exports.LineStream = LineStream; function LineStream(options) { stream.Transform.call(this, options); options = options || {}; // use objectMode to stop the output from being buffered // which re-concatanates the lines, just without newlines. this._readableState.objectMode = true; this._lineBuffer = []; this._keepEmptyLines = options.keepEmptyLines || false; this._lastChunkEndedWithCR = false; // take the source's encoding if we don't have one var self = this; this.on('pipe', function(src) { if (!self.encoding) { // but we can't do this for old-style streams if (src instanceof stream.Readable) { self.encoding = src._readableState.encoding; } } }); } util.inherits(LineStream, stream.Transform); LineStream.prototype._transform = function(chunk, encoding, done) { // decode binary chunks as UTF-8 encoding = encoding || 'utf8'; if (Buffer.isBuffer(chunk)) { if (encoding == 'buffer') { chunk = chunk.toString(); // utf8 encoding = 'utf8'; } else { chunk = chunk.toString(encoding); } } this._chunkEncoding = encoding; // see: http://www.unicode.org/reports/tr18/#Line_Boundaries var lines = chunk.split(/\r\n|[\n\v\f\r\x85\u2028\u2029]/g); // don't split CRLF which spans chunks if (this._lastChunkEndedWithCR && chunk[0] == '\n') { lines.shift(); } if (this._lineBuffer.length > 0) { this._lineBuffer[this._lineBuffer.length - 1] += lines[0]; lines.shift(); } this._lastChunkEndedWithCR = chunk[chunk.length - 1] == '\r'; this._lineBuffer = this._lineBuffer.concat(lines); this._pushBuffer(encoding, 1, done); }; LineStream.prototype._pushBuffer = function(encoding, keep, done) { // always buffer the last (possibly partial) line while (this._lineBuffer.length > keep) { var line = this._lineBuffer.shift(); // skip empty lines if (this._keepEmptyLines || line.length > 0 ) { if (!this.push(this._reencode(line, encoding))) { // when the high-water mark is reached, defer pushes until the next tick var self = this; timers.setImmediate(function() { self._pushBuffer(encoding, keep, done); }); return; } } } done(); }; LineStream.prototype._flush = function(done) { this._pushBuffer(this._chunkEncoding, 0, done); }; // see Readable::push LineStream.prototype._reencode = function(line, chunkEncoding) { if (this.encoding && this.encoding != chunkEncoding) { return new Buffer(line, chunkEncoding).toString(this.encoding); } else if (this.encoding) { // this should be the most common case, i.e. we're using an encoded source stream return line; } else { return new Buffer(line, chunkEncoding); } };
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