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/* * Phusion Passenger - https://www.phusionpassenger.com/ * Copyright (c) 2012-2025 Asynchronous B.V. * * "Passenger", "Phusion Passenger" and "Union Station" are registered * trademarks of Asynchronous B.V. * * 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. */ /** * Class for reading a stream line-by-line. * Usage: * * reader = new LineReader(stream); * reader.readLine(function(line) { * ... * // When done: * reader.close(); * }); */ function LineReader(stream) { var self = this; this.stream = stream; this.buffer = ''; this.lines = []; this.callbacks = []; this.paused = false; function handleLineBuffer() { var line, callback; if (self.lineBufferIsFull()) { stream.pause(); self.paused = true; } while (self.buffer != undefined && self.lines.length > 0 && self.callbacks.length > 0) { line = self.lines.shift(); callback = self.callbacks.shift(); callback(line); } self._autoPauseOrResume(); } function onData(data) { var index, line; if (self.buffer == undefined) { // Already closed. return; } self.buffer += data; while ((index = self.buffer.indexOf("\n")) != -1) { line = self.buffer.substr(0, index + 1); self.buffer = self.buffer.substr(index + 1); self.lines.push(line); } handleLineBuffer(); } function onEnd() { if (self.buffer != undefined) { self.lines.push(self.buffer); self.buffer = ''; self.eof = true; handleLineBuffer(); } } this.onData = onData; this.onEnd = onEnd; stream.on('data', onData); stream.on('end', onEnd); stream.resume(); } LineReader.prototype.close = function() { this.stream.removeListener('data', this.onData); this.stream.removeListener('end', this.onEnd); this._pause(); this.buffer = undefined; this.lines = undefined; }; LineReader.prototype.isClosed = function() { return this.buffer === undefined; }; LineReader.prototype.endReached = function() { return this.eof; }; LineReader.prototype.lineBufferIsFull = function() { return this.lines.length > 0; }; LineReader.prototype.readLine = function(callback) { if (this.lines.length > 0) { var line = this.lines.shift(); if (!this.lineBufferIsFull() && this.paused) { this.paused = false; this.stream.resume(); } callback(line); this._autoPauseOrResume(); } else if (this.eof) { callback(undefined); } else { this.callbacks.push(callback); } }; LineReader.prototype._autoPauseOrResume = function() { if (this.buffer != undefined) { if (this.lineBufferIsFull() || this.eof) { this._pause(); } else { this._resume(); } } }; LineReader.prototype._pause = function() { if (!this.paused) { this.paused = true; this.stream.pause(); } }; LineReader.prototype._resume = function() { if (this.paused) { this.paused = false; this.stream.resume(); } }; exports.LineReader = LineReader;
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