87 lines
3 KiB
JavaScript
87 lines
3 KiB
JavaScript
// -*- mode: js2; js-run: "swank-protocol-tests.js" -*-
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//
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// Copyright (c) 2010 Ivan Shvedunov. All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions
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// are met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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//
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials
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// provided with the distribution.
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//
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// THIS SOFTWARE IS PROVIDED BY THE AUTHOR 'AS IS' AND ANY EXPRESSED
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// OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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// ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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// GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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// WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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var readFromString = require("./lisp").readFromString;
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const HEADER_LEN = 6;
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const DUMMY_HEADER = "000000";
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const MAX_MESSAGE_SIZE = 10 * 1024 * 1024;
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function SwankParser (onMessage) {
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this.needChars = HEADER_LEN;
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this.handleData = this.handleHeader;
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this.stash = "";
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this.onMessage = onMessage;
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};
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// FIXME: proper error handling (handle both packet parsing and reader errors)
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SwankParser.prototype.execute = function execute (text) {
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var offset = 0;
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while (offset < text.length)
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offset += this.handleContent(text, offset);
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};
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SwankParser.prototype.handleContent = function handleContent (text, offset) {
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var stashLen = this.stash.length;
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var avail = Math.min(this.needChars, text.length + stashLen - offset);
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var message = this.stash + text.substring(offset, offset + avail - stashLen);
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if (avail < this.needChars)
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this.stash = message;
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else {
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this.stash = "";
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this.handleData(message);
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}
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return message.length - stashLen;
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};
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SwankParser.prototype.handleHeader = function handleHeader (str) {
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var count = parseInt(str, 16) || 0;
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if (count > 0 && count < MAX_MESSAGE_SIZE) {
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this.needChars = count;
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this.handleData = this.handleMessage;
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} else
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this.needChars = HEADER_LEN; // FIXME: handle errors
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};
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SwankParser.prototype.handleMessage = function handleMessage (str) {
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this.onMessage(readFromString(str)); // FIXME: handle errors
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this.needChars = HEADER_LEN;
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this.handleData = this.handleHeader;
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};
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function buildMessage (obj) {
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var str = obj.toString();
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var lenStr = "" + str.length.toString(16);
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while (lenStr.length < HEADER_LEN)
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lenStr = "0" + lenStr;
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return lenStr + str;
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};
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exports.SwankParser = SwankParser;
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exports.buildMessage = buildMessage;
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