Add paren support to parser

lib/parser.c

@@ -16,6 +16,8 @@ static bool is_special(char c)
 	case '|':
 	case '.':
 	case '\\':
+	case '(':
+	case ')':
 		return true;
 	default:
 		return false;
@@ -39,9 +41,24 @@ static int parse_term(const char *input, int rem, term_t *out)
 {
 	int result, used = 0;
 
-	if (used < rem && '.' == input[0]) {
+	if (1 > rem)
+		return -1;
+
+	if ('.' == input[0]) {
 		out->type = TERM_TYPE_WILDCARD;
 		++used;
+	} else if ('(' == input[0]) {
+		++used;
+
+		result = parse_regex(input + used, rem - used, &out->regex);
+		if (result < 0)
+			return -1;
+		out->type = TERM_TYPE_REGEX;
+		used += result;
+
+		if (')' != input[used])
+			return -1;
+		++used;
 	} else {
 		result = parse_literal(input + used, rem - used, &out->literal);
 		if (result < 0)
@@ -94,9 +111,7 @@ int parse_regex(const char *input, int rem, regex_t *out)
 		return -1;
 	used += result;
 
-	if (used < rem) {
-		if (input[used] != '|')
-			return -1;
+	if (used < rem && '|' == input[used]) {
 		++used;
 
 		out->alternative = calloc(1, sizeof(regex_t));