@canboat/visual-analyzer
Version:
NMEA 2000 data visualization utility (requires SK Server >= 2.15)
57 lines (54 loc) • 1.94 kB
JavaScript
"use strict";
/*
* Copyright 2014-2015 Fabian Tollenaar <fabian@starting-point.nl>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* Usage:
* This is part of a PipedProvider that splits the input into separate lines and passes one line at a time to the next provider.
* You can specify the line separator with the option lineSeparator.
{
"type": "providers/liner"
},
*/
const Transform = require('stream').Transform;
function Liner(options) {
Transform.call(this, {
objectMode: true,
});
this.doPush = this.push.bind(this);
this.lineSeparator = options.lineSeparator || '\n';
}
require('util').inherits(Liner, Transform);
Liner.prototype._transform = function (chunk, encoding, done) {
let data = chunk.toString();
if (this._lastLineData) {
data = this._lastLineData + data;
}
const lines = data.split(this.lineSeparator);
this._lastLineData = lines.splice(lines.length - 1, 1)[0];
if (this._lastLineData.length > 2048) {
console.error('Are you sure you are using the correct line terminator? Not going to handle lines longer than 2048 chars.');
this._lastLineData = '';
}
lines.forEach(this.doPush);
done();
};
Liner.prototype._flush = function (done) {
if (this._lastLineData) {
this.push(this._lastLineData);
}
this._lastLineData = null;
done();
};
module.exports = Liner;
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