From a9b8e240070c1e99a1af925208d518fdc3671a08 Mon Sep 17 00:00:00 2001
From: Camden Dixie O'Brien <cdo@wip.sh>
Date: Fri, 25 Oct 2024 14:16:56 +0100
Subject: [PATCH] Handle . in parse_term()

---
 lib/parser.c         | 17 ++++++++++++-----
 tests/parser_tests.c | 14 ++++++++++++++
 2 files changed, 26 insertions(+), 5 deletions(-)

diff --git a/lib/parser.c b/lib/parser.c
index f4b7b0f..60e724e 100644
--- a/lib/parser.c
+++ b/lib/parser.c
@@ -14,6 +14,7 @@ static bool is_special(char c)
 {
 	switch (c) {
 	case '|':
+	case '.':
 		return true;
 	default:
 		return false;
@@ -34,12 +35,18 @@ static int parse_term(const char *input, int rem, term_t *out)
 {
 	int result, used = 0;
 
-	result = parse_literal(input + used, rem - used, &out->literal);
-	if (result < 0)
-		return -1;
+	if (used < rem && '.' == input[0]) {
+		out->type = TERM_TYPE_WILDCARD;
+		++used;
+	} else {
+		result = parse_literal(input + used, rem - used, &out->literal);
+		if (result < 0)
+			return -1;
+		out->type = TERM_TYPE_LITERAL;
+		used += result;
+	}
+
 	out->quantifier = QUANTIFIER_NONE;
-	out->type = TERM_TYPE_LITERAL;
-	used += result;
 
 	return used;
 }
diff --git a/tests/parser_tests.c b/tests/parser_tests.c
index 35554c9..1fab8b2 100644
--- a/tests/parser_tests.c
+++ b/tests/parser_tests.c
@@ -84,6 +84,19 @@ static void abc_is_parsed_as_sequence_of_unquantified_literals(void)
 	regex_free_children(&r);
 }
 
+static void dot_is_parsed_as_unquantified_wildcard_term(void)
+{
+	regex_t r = { 0 };
+	const int result = PARSE_REGEX_STRING(".", &r);
+	ASSERT_NE(-1, result);
+
+	ASSERT_EQ(1, r.sequence.len);
+	ASSERT_EQ(QUANTIFIER_NONE, r.sequence.contents[0].quantifier);
+	ASSERT_EQ(TERM_TYPE_WILDCARD, r.sequence.contents[0].type);
+
+	regex_free_children(&r);
+}
+
 int main(void)
 {
 	TESTING_BEGIN();
@@ -93,5 +106,6 @@ int main(void)
 	a_is_parsed_as_unquantified_literal();
 	b_is_parsed_as_unquantified_literal();
 	abc_is_parsed_as_sequence_of_unquantified_literals();
+	dot_is_parsed_as_unquantified_wildcard_term();
 	return TESTING_END();
 }