Refactor errors and update post draft.

code/compiler/13/parse_driver.hpp

@@ -14,13 +14,13 @@ void scanner_destroy(yyscan_t* scanner);
 struct parse_driver {
     std::string file_name;
     std::ostringstream string_stream;
+    std::string file_contents;
 
     yy::location location;
     size_t file_offset;
-
     std::vector<size_t> line_offsets;
+
     definition_group global_defs;
-    std::string file_contents;
 
     parse_driver(const std::string& file)
         : file_name(file), file_offset(0) {}
@@ -30,7 +30,10 @@ struct parse_driver {
     void mark_line();
     size_t get_index(int line, int column);
     size_t get_line_end(int line);
-    void print_highlighted_location(std::ostream& stream, const yy::location& loc);
+    void print_location(
+            std::ostream& stream,
+            const yy::location& loc,
+            bool highlight = true);
 };
 
 #define YY_DECL yy::parser::symbol_type yylex(yyscan_t yyscanner, parse_driver& drv)