Unwrap rules on reading

examples/test.modal

@@ -1,5 +1,4 @@
 <> (?x dup) (?x ?x)
 <> (?x ?y swap) (?y ?x)
 
-((A B swap) dup)
-
+A B dup

src/modal.c

@@ -107,7 +107,7 @@ print_rules(void)
 {
 	int i;
 	for(i = 0; i < rules_len; i++)
-		printf("Rule #%d: %s -> %s\n", i, rules[i].a, rules[i].b);
+		printf("Rule #%d: <%s> -> <%s>\n", i, rules[i].a, rules[i].b);
 	printf("\n");
 }
 
@@ -118,13 +118,18 @@ parse_rulefrag(char *line)
 	char c, *s = line, *res = dict_;
 	if(s[0] == '(') {
 		while((c = *s++)) {
-			if(c == '(') depth++;
-			*dict_++ = c;
-			if(c == ')') --depth;
-			if(!depth) {
-				*dict_++ = 0;
-				return res;
+			if(c == '(') {
+				depth++;
+				if(depth == 1) continue;
 			}
+			if(c == ')') {
+				--depth;
+				if(!depth) {
+					*dict_++ = 0;
+					return res;
+				}
+			}
+			*dict_++ = c;
 		}
 	}
 	while(!spacer(s[0]) && (*dict_++ = *s++))