pass file into flex instead of content buffer

src/lexer/lexer.c

@@ -8,8 +8,7 @@ void lexer(LexerState state) {
 
     yyset_extra(&state, scanner);
 
-    void* buffer = yy_scan_string(state.content, scanner);
-    yy_switch_to_buffer(buffer, scanner);
+    yyset_in(state.file, scanner);
 
     int token;
     while ((token = yylex(scanner)) != 0) {
@@ -26,7 +25,5 @@ void lexer(LexerState state) {
             state.current_column += yyget_leng(scanner);
         }
     }
-
-    yy_delete_buffer(buffer, scanner);
     yylex_destroy(scanner);
 }

src/lexer/lexer.h

@@ -1,9 +1,10 @@
 #include "token.h"
 #include "../list/list.h"
+#include <stdio.h>
 
 typedef struct {
     const char *path;
-    const char *content;
+    FILE *file;
     int current_column;
     LinkedList* tokens;
     // add more fields as needed