Extended XML loading process

Now you specify to not to crash when you're trying to load xml
You can also specify two paths to try to load from

Will be used in UI styles system.

src/xrCore/XML/XMLDocument.cpp

@@ -45,23 +45,42 @@ void ParseFile(pcstr path, CMemoryWriter& W, IReader* F, XMLDocument* xml)
     }
 }
 
-void XMLDocument::Load(pcstr path_alias, pcstr path, pcstr _xml_filename)
+bool XMLDocument::Load(pcstr path_alias, pcstr path, pcstr xml_filename, bool fatal)
 {
-    shared_str fn = correct_file_name(path, _xml_filename);
+    shared_str fn = correct_file_name(path, xml_filename);
 
     string_path str;
     xr_sprintf(str, "%s\\%s", path, *fn);
-    return Load(path_alias, str);
+    return Load(path_alias, str, fatal);
 }
 
-//инициализация и загрузка XML файла
-void XMLDocument::Load(pcstr path, pcstr xml_filename)
+// Try to load from the first path, and if it's failed then try the second one
+bool XMLDocument::Load(pcstr path_alias, pcstr path, pcstr path2, pcstr xml_filename, bool fatal /*= true*/)
 {
-    xr_strcpy(m_xml_file_name, xml_filename);
-    // Load and parse xml file
+    shared_str fn = correct_file_name(path, xml_filename);
+
+    string_path str;
+    xr_sprintf(str, "%s\\%s", path, *fn);
+    if (Load(path_alias, str, false))
+        return true;
 
+    xr_sprintf(str, "%s\\%s", path2, *fn);
+    return Load(path_alias, str, fatal);
+}
+
+// Load and parse xml file
+bool XMLDocument::Load(pcstr path, pcstr xml_filename, bool fatal)
+{
     IReader* F = FS.r_open(path, xml_filename);
-    R_ASSERT2(F, xml_filename);
+    if (!F)
+    {
+        if (fatal)
+            R_ASSERT3(F, "Can't find specified xml file", xml_filename);
+        else
+            return false;
+    }
+
+    xr_strcpy(m_xml_file_name, xml_filename);
 
     CMemoryWriter W;
     ParseFile(path, W, F, this);
@@ -79,6 +98,8 @@ void XMLDocument::Load(pcstr path, pcstr xml_filename)
     }
 
     m_root = m_Doc.firstChildElement();
+
+    return true;
 }
 
 XML_NODE XMLDocument::NavigateToNode(XML_NODE start_node, pcstr path, const size_t node_index) const

src/xrCore/XML/XMLDocument.hpp

@@ -127,15 +127,16 @@ struct XML_DOC
 
 class XRCORE_API XMLDocument
 {
-    void Load(pcstr path_alias, pcstr xml_filename);
 
 public:
     string_path m_xml_file_name;
     XMLDocument();
     virtual ~XMLDocument();
     void ClearInternal();
 
-    void Load(pcstr path_alias, pcstr path, pcstr xml_filename);
+    bool Load(pcstr path_alias, pcstr xml_filename, bool fatal = true);
+    bool Load(pcstr path_alias, pcstr path, pcstr xml_filename, bool fatal = true);
+    bool Load(pcstr path_alias, pcstr path, pcstr path2, pcstr xml_filename, bool fatal = true);
 
     //чтение элементов
     pcstr Read(pcstr path, const size_t index, pcstr default_str_val) const;