Added XPath method used to escape XPath strings.

git-svn-id: http://yate.null.ro/svn/yate/trunk@6539 acf43c95-373e-0410-b603-e72c3f656dc1

engine/XML.cpp

@@ -3914,6 +3914,18 @@ void XPath::dump(ObjList& lst, bool escape) const
     }
 }
 
+String& XPath::escape(String& buf, const String& str, char quot, bool literal)
+{
+    if (quot != '"' && quot != '\'')
+	quot = '"';
+    if (!str)
+	return buf << quot << quot;
+    buf << quot;
+    if (literal)
+	return XPathParseData::escapeStringLiteral(buf,str,quot) << quot;
+    return XmlSaxParser::escape(buf,str) << quot;
+}
+
 unsigned int XPath::maxStepPredicates()
 {
     return XPATH_MAX_PREDICATES;

yatexml.h

@@ -2132,6 +2132,17 @@ public:
      */
     void dump(ObjList& lst, bool escape = true) const;
 
+    /**
+     * Escape a string and add quoted value to buffer
+     * @param buf Destination buffer
+     * @param str String to escape
+     * @param quot Character to use for quoting. Use " if not " or '
+     * @param literal Escape as literal (used in comparison operators) or
+     *  XML string (used in function parameters)
+     * @return Destination buffer reference
+     */
+    static String& escape(String& buf, const String& str, char quot = '"', bool literal = true);
+
     /**
      * Retrieve the number of maximum allowed predicates in a path step
      * @return Maximum allowed predicates in a path step