Add a method to print location.

code/compiler/13/parse_driver.hpp

@@ -59,6 +59,19 @@ struct parse_driver {
         if(line > line_offsets.size()) return read_file.size();
         return get_index(line+1, 1);
     }
+
+    void print_highlighted_location(std::ostream& stream, const yy::location& loc) {
+        size_t print_start = get_index(loc.begin.line, 1);
+        size_t highlight_start = get_index(loc.begin.line, loc.begin.column);
+        size_t highlight_end = get_index(loc.end.line, loc.end.column);
+        size_t print_end = get_line_end(loc.end.line);
+        const char* content = read_file.c_str();
+        stream.write(content + print_start, highlight_start - print_start);
+        stream << "\033[4;31m";
+        stream.write(content + highlight_start, highlight_end - highlight_start);
+        stream << "\033[0m";
+        stream.write(content + highlight_end, print_end - highlight_end);
+    }
 };
 
 #define YY_DECL yy::parser::symbol_type yylex(yyscan_t yyscanner, parse_driver& drv)