Start using driver, and switch to file IO.

13/parser.y

@@ -1,17 +1,21 @@
-%{
+%code requires {
 #include <string>
-#include <iostream>
-#include <map>
+#include <vector>
 #include "ast.hpp"
 #include "definition.hpp"
 #include "parser.hpp"
 #include "parsed_type.hpp"
 
-definition_group global_defs;
+class parse_driver;
+using yyscan_t = void*;
+}
 
-extern yy::parser::symbol_type yylex();
+%param { yyscan_t scanner }
+%param { parse_driver& drv }
 
-%}
+%code {
+#include "parse_driver.hpp"
+}
 
 %token BACKSLASH
 %token PLUS
@@ -59,7 +63,7 @@ extern yy::parser::symbol_type yylex();
 %%
 
 program
-    : definitions { global_defs = std::move($1); global_defs.vis = visibility::global; }
+    : definitions { $1.vis = visibility::global; std::swap(drv.global_defs, $1); }
     ;
 
 definitions