add comments

4 files changed, 45 insertions, 4 deletions

diff --git a/src/include/nxspp.h b/src/include/nxspp.h
new file mode 100644
index 0000000..d60832f
--- /dev/null
+++ b/src/include/nxspp.h
@@ -0,0 +1,4 @@
+#ifndef NXSPP_H
+#define NXSPP_H
+
+#endif
diff --git a/src/lexer.c b/src/lexer.c
index db4c44b..29c6542 100644
--- a/src/lexer.c
+++ b/src/lexer.c
@@ -123,18 +123,20 @@ static token_t *lexer_move_with(lexer_t *lexer, token_t *token) {
 }
 
 token_t *lexer_collect_next(lexer_t *lexer) {
+start:
   if (lexer->c == '\0' || lexer->c == EOF) {
     lexer->finished = true;
     return NULL;
   }
-
   if (isspace(lexer->c)) {
     lexer_ignore_whitespace(lexer);
+    goto start;
   }
-  if (lexer->c == '\0' || lexer->c == EOF) {
-    lexer->finished = true;
-    return NULL;
+  if (lexer->c == ';') {
+    lexer_skip_comment(lexer);
+    goto start;
   }
+
   if (isdigit(lexer->c))
     return lexer_collect_num(lexer);
   else if (is_valid_id_char(lexer->c))
diff --git a/src/main.c b/src/main.c
index 8db3f77..bbe725c 100644
--- a/src/main.c
+++ b/src/main.c
@@ -131,6 +131,7 @@ int main(int argc, char **argv) {
     printf("TOO FEW ARGUMENTS.\n");
     exit(1);
   }
+
   char *filename = argv[1];
   char *buffer = 0;
   long length;
@@ -148,6 +149,12 @@ int main(int argc, char **argv) {
   }
 
   if (buffer) {
+    /* lexer_t *lexer = init_lexer(buffer); */
+    /* token_t *t = lexer_collect_next(lexer); */
+    /* while (t != NULL) { */
+    /*   printf("%d: %s\n", t->type, t->value); */
+    /*   t = lexer_collect_next(lexer); */
+    /* } */
     /* printf("%s", buffer); */
     lexer_t *lexer = init_lexer(buffer);
     parser_t *parser = init_parser(lexer);
diff --git a/src/visitor.c b/src/visitor.c
index ba29f3f..14ea404 100644
--- a/src/visitor.c
+++ b/src/visitor.c
@@ -397,6 +397,34 @@ ast_t *eval_list(visitor_t *v, ast_t *e) {
       ast_t *arg2 = eval_expr(v, args->cdr->car);
       ast_t *ret = init_ast_pair(arg1, arg2);
       return ret;
+    } else if (strcmp(function->string_value, "eq") == 0) {
+      if (cmp != 2)
+        eval_error(v, e);
+
+      ast_t *arg1 = eval_expr(v, args->car);
+      ast_t *arg2 = eval_expr(v, args->cdr->car);
+
+      if ((arg1->type == AST_STRING) && (arg2->type == AST_STRING)) {
+        return init_ast_bool(strcmp(arg1->string_value, arg2->string_value) ==
+                             0);
+      } else
+        eval_error(v, e);
+    } else if (strcmp(function->string_value, "concat") == 0) {
+      if (cmp != 2)
+        eval_error(v, e);
+
+      ast_t *arg1 = eval_expr(v, args->car);
+      ast_t *arg2 = eval_expr(v, args->cdr->car);
+
+      if ((arg1->type == AST_STRING) && (arg2->type == AST_STRING)) {
+        int string_len1 = strlen(arg1->string_value);
+        int string_len2 = strlen(arg2->string_value);
+        char *ret = malloc((string_len1 + string_len2) * sizeof(char));
+        strcat(ret, arg1->string_value);
+        strcat(ret, arg2->string_value);
+        return ret;
+      } else
+        eval_error(v, e);
     }
   }