Implement first iteration of parser and write test scripts

tests/parser_tests.c

@@ -0,0 +1,76 @@
+/*
+ * Copyright (c) Camden Dixie O'Brien
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+#include "parser.h"
+#include "testing.h"
+
+#define PARSE_REGEX_STRING(s, r) parse_regex(s, strlen(s), r)
+
+static void a_has_no_alternative(void)
+{
+	regex_t r = { 0 };
+	const int result = PARSE_REGEX_STRING("a", &r);
+	ASSERT_NE(-1, result);
+	ASSERT_NULL(r.alternative);
+	regex_free_children(&r);
+}
+
+static void a_pipe_b_has_alternative(void)
+{
+	regex_t r = { 0 };
+	const int result = PARSE_REGEX_STRING("a|b", &r);
+	ASSERT_NE(-1, result);
+	ASSERT_NOT_NULL(r.alternative);
+	regex_free_children(&r);
+}
+
+static void a_pipe_b_pipe_c_result_alternative_has_alternative(void)
+{
+	regex_t r = { 0 };
+	const int result = PARSE_REGEX_STRING("a|b|c", &r);
+	ASSERT_NE(-1, result);
+	ASSERT_NOT_NULL(r.alternative);
+	ASSERT_NOT_NULL(r.alternative->alternative);
+	regex_free_children(&r);
+}
+
+static void a_is_parsed_as_unquantified_literal(void)
+{
+	regex_t r = { 0 };
+	const int result = PARSE_REGEX_STRING("a", &r);
+	ASSERT_NE(-1, result);
+
+	ASSERT_EQ(1, r.sequence.len);
+	ASSERT_EQ(QUANTIFIER_NONE, r.sequence.contents[0].quantifier);
+	ASSERT_EQ(TERM_TYPE_LITERAL, r.sequence.contents[0].type);
+	ASSERT_EQ('a', r.sequence.contents[0].literal);
+
+	regex_free_children(&r);
+}
+
+static void b_is_parsed_as_unquantified_literal(void)
+{
+	regex_t r = { 0 };
+	const int result = PARSE_REGEX_STRING("b", &r);
+	ASSERT_NE(-1, result);
+
+	ASSERT_EQ(1, r.sequence.len);
+	ASSERT_EQ(QUANTIFIER_NONE, r.sequence.contents[0].quantifier);
+	ASSERT_EQ(TERM_TYPE_LITERAL, r.sequence.contents[0].type);
+	ASSERT_EQ('b', r.sequence.contents[0].literal);
+
+	regex_free_children(&r);
+}
+
+int main(void)
+{
+	TESTING_BEGIN();
+	a_has_no_alternative();
+	a_pipe_b_has_alternative();
+	a_pipe_b_pipe_c_result_alternative_has_alternative();
+	a_is_parsed_as_unquantified_literal();
+	b_is_parsed_as_unquantified_literal();
+	return TESTING_END();
+}