Migrate to minify-maven-plugin and Google Closure Compiler.

guacamole-common-js/src/main/webapp/modules/Parser.js

@@ -0,0 +1,159 @@
+/*
+ * Copyright (C) 2013 Glyptodon LLC
+ *
+ * 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 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 (length == NaN)
+                    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;
+
+};