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| <h1 class="page-title">Source: Parser.js</h1> |
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| <pre class="prettyprint source linenums"><code>/* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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. |
| */ |
| |
| var Guacamole = Guacamole || {}; |
| |
| /** |
| * Simple Guacamole protocol parser that invokes an oninstruction event when |
| * full instructions are available from data received via receive(). |
| * |
| * @constructor |
| */ |
| Guacamole.Parser = function() { |
| |
| /** |
| * Reference to this parser. |
| * @private |
| */ |
| var parser = this; |
| |
| /** |
| * Current buffer of received data. This buffer grows until a full |
| * element is available. After a full element is available, that element |
| * is flushed into the element buffer. |
| * |
| * @private |
| */ |
| var buffer = ""; |
| |
| /** |
| * Buffer of all received, complete elements. After an entire instruction |
| * is read, this buffer is flushed, and a new instruction begins. |
| * |
| * @private |
| */ |
| var element_buffer = []; |
| |
| // The location of the last element's terminator |
| var element_end = -1; |
| |
| // Where to start the next length search or the next element |
| var start_index = 0; |
| |
| /** |
| * Appends the given instruction data packet to the internal buffer of |
| * this Guacamole.Parser, executing all completed instructions at |
| * the beginning of this buffer, if any. |
| * |
| * @param {String} packet The instruction data to receive. |
| */ |
| this.receive = function(packet) { |
| |
| // Truncate buffer as necessary |
| if (start_index > 4096 && element_end >= start_index) { |
| |
| buffer = buffer.substring(start_index); |
| |
| // Reset parse relative to truncation |
| element_end -= start_index; |
| start_index = 0; |
| |
| } |
| |
| // Append data to buffer |
| buffer += packet; |
| |
| // While search is within currently received data |
| while (element_end < buffer.length) { |
| |
| // If we are waiting for element data |
| if (element_end >= start_index) { |
| |
| // We now have enough data for the element. Parse. |
| var element = buffer.substring(start_index, element_end); |
| var terminator = buffer.substring(element_end, element_end+1); |
| |
| // Add element to array |
| element_buffer.push(element); |
| |
| // If last element, handle instruction |
| if (terminator == ";") { |
| |
| // Get opcode |
| var opcode = element_buffer.shift(); |
| |
| // Call instruction handler. |
| if (parser.oninstruction != null) |
| parser.oninstruction(opcode, element_buffer); |
| |
| // Clear elements |
| element_buffer.length = 0; |
| |
| } |
| else if (terminator != ',') |
| throw new Error("Illegal terminator."); |
| |
| // Start searching for length at character after |
| // element terminator |
| start_index = element_end + 1; |
| |
| } |
| |
| // Search for end of length |
| var length_end = buffer.indexOf(".", start_index); |
| if (length_end != -1) { |
| |
| // Parse length |
| var length = parseInt(buffer.substring(element_end+1, length_end)); |
| if (isNaN(length)) |
| throw new Error("Non-numeric character in element length."); |
| |
| // Calculate start of element |
| start_index = length_end + 1; |
| |
| // Calculate location of element terminator |
| element_end = start_index + length; |
| |
| } |
| |
| // If no period yet, continue search when more data |
| // is received |
| else { |
| start_index = buffer.length; |
| break; |
| } |
| |
| } // end parse loop |
| |
| }; |
| |
| /** |
| * Fired once for every complete Guacamole instruction received, in order. |
| * |
| * @event |
| * @param {String} opcode The Guacamole instruction opcode. |
| * @param {Array} parameters The parameters provided for the instruction, |
| * if any. |
| */ |
| this.oninstruction = null; |
| |
| }; |
| </code></pre> |
| </article> |
| </section> |
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