Added operation: "XPath expression"

.gitignore

@@ -4,3 +4,4 @@ build/dev
 docs/*
 !docs/*.conf.json
 !docs/*.ico
+.idea/*

Gruntfile.js

@@ -123,6 +123,7 @@ module.exports = function(grunt) {
         "src/js/lib/vkbeautify.js",
         "src/js/lib/Sortable.js",
         "src/js/lib/bootstrap-colorpicker.js",
+        'src/js/lib/jquery.xpath.js',
         
         // Custom libraries
         "src/js/lib/canvas_components.js",

src/js/config/Categories.js

@@ -186,6 +186,7 @@ var Categories = [
             "Extract file paths",
             "Extract dates",
             "Regular expression",
+            "XPath expression",
         ]
     },
     {

src/js/config/OperationConfig.js

@@ -1893,6 +1893,24 @@ var OperationConfig = {
             },
         ]
     },
+    "XPath expression": {
+        description: "Extract information from an xml document with an XPath query",
+        run: Extract.run_xpath,
+        input_type: "string",
+        output_type: "string",
+        args: [
+            {
+                name: "XPath",
+                type: "string",
+                value: Extract.XPATH_INITIAL
+            },
+            {
+                name: "Result delimiter",
+                type: "binary_short_string",
+                value: Extract.XPATH_DELIMITER
+            }
+        ]
+    },
     "From UNIX Timestamp": {
         description: "Converts a UNIX timestamp to a datetime string.<br><br>e.g. <code>978346800</code> becomes <code>Mon 1 January 2001 11:00:00 UTC</code>",
         run: DateTime.run_from_unix_timestamp,

src/js/operations/Extract.js

@@ -10,7 +10,7 @@
 var Extract = {
 
     /**
-     * Runs search operations across the input data using refular expressions.
+     * Runs search operations across the input data using regular expressions.
      *
      * @private
      * @param {string} input
@@ -293,5 +293,66 @@ var Extract = {
         output += Extract.run_dates(input, []);
         return output;
     },
-    
+
+    /**
+     * @constant
+     * @default
+     */
+    XPATH_INITIAL: "",
+
+    /**
+     * @constant
+     * @default
+     */
+    XPATH_DELIMITER: "\\n",
+
+    /**
+     * Extract information (from an xml document) with an XPath query
+     *
+     * @param {string} input
+     * @param {Object[]} args
+     * @returns {string}
+     */
+    run_xpath:function(input, args) {
+        var query = args[0];
+        var delimiter = args[1];
+
+        try {
+            var xml = $.parseXML(input);
+        } catch (err) {
+            return "Invalid input XML.";
+        }
+
+        try {
+            var result = $.xpath(xml, query);
+        } catch (err) {
+            return "Invalid XPath. Details:\n" + err.message;
+        }
+
+        var serializer = new XMLSerializer();
+        var output = "";
+        for (var i = 0; i < result.length; i++) {
+            if (i > 0) output +=  delimiter;
+
+            switch (result[i].nodeType) {
+                case Node.ELEMENT_NODE:
+                    output += serializer.serializeToString(result[i]);
+                    break;
+                case Node.ATTRIBUTE_NODE:
+                    output += result[i].value;
+                    break;
+                case Node.TEXT_NODE:
+                    output += result[i].wholeText;
+                    break;
+                case Node.COMMENT_NODE:
+                    output += result[i].data;
+                    break;
+                default:
+                    throw new Error("Unknown Node Type: " + result[i].nodeType);
+            }
+        }
+
+        return output;
+    }
+
 };