1 files changed, 24 insertions, 0 deletions
diff --git a/src/visitor.c b/src/visitor.c
index 25296c1..98a7d92 100644
--- a/src/visitor.c
+++ b/src/visitor.c
@@ -2,7 +2,9 @@
 #include "./include/hash_table.h"
 #include "./include/macros.h"
 #include "./include/stack.h"
+#include <stdbool.h>
 #include <stdlib.h>
+#include <string.h>
 
 visitor_t *init_visitor(ast_t *root) {
   visitor_t *v = (visitor_t *)malloc(sizeof(visitor_t));
@@ -23,3 +25,25 @@ bool is_self_evaluating(ast_t *e) {
     return true;
   return false;
 }
+
+/* Special symbols: car, cdr, quote, *, /, +, -, %, inc, dec, >, <, >=, <=, /=,
+ * =, equal (for strings), input */
+ast_t *eval_symbol(visitor_t *v, ast_t *e) {}
+
+ast_t *eval_list(visitor_t *v, ast_t *e) {}
+
+ast_t *eval_expr(visitor_t *v, ast_t *e) {
+  if (is_self_evaluating(e))
+    return e;
+  else if (e->type == AST_PAIR)
+    return eval_list(v, e);
+  else if (e->type == AST_SYMBOL)
+    return eval_symbol(v, e);
+  else {
+    eval_error(v, e);
+  }
+}
+
+ast_t *eval(visitor_t *v) {}
+
+void eval_error(visitor_t *v, ast_t *e) { exit(1); }