#1475 Better error message when unbalanced braces in the input file.

Sources/Utilities/LuaOptionFile/LuaOptionFile.cpp

@@ -392,13 +392,37 @@ namespace MoReFEM
                     oconv << "Last brace found in the file " << file_ << " is an opening one!";
                     throw Exception(oconv.str(), __FILE__, __LINE__);
                 }
+            }
+
+            // Check there are an equal number of opening and closing braces.
+            auto opening_brace_lbd = [](int i)
+            {
+                return i > 0;
+            };
+
+            auto closing_brace_lbd = [](int i)
+            {
+                return i < 0;
+            };
 
+            const auto Nopening_brace = std::count_if(brace_position_list_.cbegin(),
+                                                      brace_position_list_.cend(),
+                                                      opening_brace_lbd);
 
+            const auto Nclosing_brace = std::count_if(brace_position_list_.cbegin(),
+                                                      brace_position_list_.cend(),
+                                                      closing_brace_lbd);
+
+            if (Nopening_brace != Nclosing_brace)
+            {
+                std::ostringstream oconv;
+                oconv << "Unbalanced braces in the file " << file_ << ": there is " << Nopening_brace << " '{'"
+                << " and " << Nclosing_brace << " '}' [the ones related to maps or in comments aren't counted].";
+                throw Exception(oconv.str(), __FILE__, __LINE__);
             }
 
 
             // Pair the braces together.
-
             std::vector<std::pair<std::size_t, std::size_t>> pair_list;
 
             auto copy = brace_position_list_;
@@ -415,10 +439,7 @@ namespace MoReFEM
                 // Find first negative value.
                 auto it = std::find_if(copy.cbegin(),
                                        copy.cend(),
-                                       [](int i)
-                                       {
-                                           return i < 0;
-                                       });
+                                       closing_brace_lbd);
 
                 assert(it != copy.cend());
                 assert(it != copy.cbegin());