feat: implement AST walker

src/compiler/main.c

@@ -1,6 +1,7 @@
 #include <compiler/fzl_debug.h>
 #include <compiler/fzl_parser.h>
 #include <compiler/fzl_reader.h>
+#include <compiler/fzl_walker.h>
 #include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -155,12 +156,35 @@ int main(int argc, char **argv)
   {
     printf("ok!\n");
     fzl_debug_print_ast(parser->root);
+    printf("-> walking AST...");
+  }
+
+  fzl_walker_t *walker = fzl_mkwalker(parser->root);
+  result = fzl_walk(walker);
+  if (result != 0)
+  {
+    printf("Error: %s\n", fzl_walker_geterror());
+    return -1;
+  }
+
+  if (args->verbose)
+  {
+    printf("ok!\n");
+
+    printf("--> Constants table:\n");
+    for (size_t i = 0; i < walker->consts->size; i++)
+      printf("---> %s\n", walker->consts->array[i].as.string.chars);
+
+    printf("--> Ops:\n");
+    for (size_t i = 0; i < walker->op_count; i++)
+      printf("---> %lu\n", walker->ops[i]);
   }
 
   free(args);
   fzl_freereader(rd);
   fzl_freeparser(parser);
   fzl_freeast(parser->root);
+  fzl_freewalker(walker);
 
   printf("done.\n");
   return 0;