extracted line couting

src/indent_helper.hpp

@@ -7,6 +7,8 @@ enum class IndentAction
     None
 };
 
+constexpr int TAB_WIDTH = 8;
+
 class IndentHelper
 {
     std::stack<int> indent_stack;
@@ -56,4 +58,14 @@ public:
         pending_dedents--;
         return true;
     }
+
+    static int calculateColumn(const char *text, int length)
+    {
+        int spaces = 0;
+        for (int i = 0; i < length; i++)
+        {
+            spaces += (text[i] == '\t') ? TAB_WIDTH : 1;
+        }
+        return spaces;
+    }
 };