Language client: added support for ?. completions

src/source_language_protocol.cpp

@@ -1436,7 +1436,7 @@ void Source::LanguageProtocolView::setup_autocomplete() {
     autocomplete_show_arguments = false;
 
     auto line = ' ' + get_line_before();
-    const static std::regex regex("^.*([a-zA-Z_\\)\\]\\>\"']|[^a-zA-Z0-9_][a-zA-Z_][a-zA-Z0-9_]*)(\\.)([a-zA-Z0-9_]*)$|" // .
+    const static std::regex regex("^.*([a-zA-Z_\\)\\]\\>\"']|[^a-zA-Z0-9_][a-zA-Z_][a-zA-Z0-9_]*\\?{0,1})(\\.)([a-zA-Z0-9_]*)$|" // .
                                   "^.*(::)([a-zA-Z0-9_]*)$|"                                                                     // ::
                                   "^.*[^a-zA-Z0-9_]([a-zA-Z_][a-zA-Z0-9_]{2,})$");                                               // part of symbol
     std::smatch sm;
@@ -1652,12 +1652,23 @@ void Source::LanguageProtocolView::setup_autocomplete() {
     get_buffer()->erase(CompletionDialog::get()->start_mark->get_iter(), get_buffer()->get_insert()->get_iter());
 
     // Do not insert function/template parameters if they already exist
+    {
       auto iter = get_buffer()->get_insert()->get_iter();
       if(*iter == '(' || *iter == '<') {
         auto bracket_pos = insert.find(*iter);
         if(bracket_pos != std::string::npos)
           insert.erase(bracket_pos);
       }
+    }
+
+    // Do not instert ?. after ., instead replace . with ?.
+    if(1 < insert.size() && insert[0] == '?' && insert[1] == '.') {
+      auto iter = get_buffer()->get_insert()->get_iter();
+      auto prev = iter;
+      if(prev.backward_char() && *prev == '.') {
+        get_buffer()->erase(prev, iter);
+      }
+    }
 
     if(hide_window) {
       if(autocomplete_show_arguments) {