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Edit File : byline.js \| Size : 4.75 KB
// 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); } }; Back

Edit File : byline.js | Size : 4.75 KB

// 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);
};

//
// 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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