From d55938b34d6b7ee2c2d7da8483aaed5c8b9078a0 Mon Sep 17 00:00:00 2001
From: Johnny Richard <johnny@johnnyrichard.com>
Date: Sun, 16 Apr 2023 01:10:35 +0200
Subject: util: Create string_view tool to optimize memory usage

We are allocating heap memory to create tokens value, we can minimize the
number of allocations if we start using string_view.

We have other problems, right now the tokens value ownership are quite
unclear once the AST nodes also share the memory allocation done by
token_get_next_token function.

It's important to clarify we also have memory leaks on the current
implementation.  Hence, we are going to start using string_view to make
the memory management easier. :^)

Signed-off-by: Johnny Richard <johnny@johnnyrichard.com>
---
 test/string_view_test.c | 97 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 97 insertions(+)
 create mode 100644 test/string_view_test.c

(limited to 'test/string_view_test.c')

diff --git a/test/string_view_test.c b/test/string_view_test.c
new file mode 100644
index 0000000..130ec2c
--- /dev/null
+++ b/test/string_view_test.c
@@ -0,0 +1,97 @@
+/*
+* Copyright (C) 2023 Johnny Richard
+*
+* This program is free software: you can redistribute it and/or modify
+* it under the terms of the GNU General Public License as published by
+* the Free Software Foundation, either version 3 of the License, or
+* (at your option) any later version.
+*
+* This program is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+* GNU General Public License for more details.
+*
+* You should have received a copy of the GNU General Public License
+* along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+#define MUNIT_ENABLE_ASSERT_ALIASES
+#include "munit.h"
+#include "string_view.h"
+
+static MunitResult
+test_create_new(const  MunitParameter params[],
+                void  *user_data_or_fixture)
+{
+  char *str = "hello world";
+  string_view_t sv = string_view_new(str, strlen(str));
+
+  assert_string_equal("hello world", (char *) sv.str);
+  assert_int(sv.size, ==, strlen(str));
+
+  return MUNIT_OK;
+}
+
+static MunitResult
+test_from_str(const  MunitParameter params[],
+                void  *user_data_or_fixture)
+{
+  char *str = "hello world";
+
+  string_view_t sv = string_view_from_str(str);
+
+  assert_string_equal(str, (char *) sv.str);
+  assert_int(sv.size, ==, strlen(str));
+
+  return MUNIT_OK;
+}
+
+static MunitResult
+test_to_str(const  MunitParameter params[],
+             void  *user_data_or_fixture)
+{
+  char *str = "hello world";
+
+  string_view_t sv = string_view_new(str, 5);
+
+  char actual[sv.size + 1];
+  string_view_to_str(&sv, actual);
+
+  assert_string_equal(actual, "hello");
+
+  return MUNIT_OK;
+}
+
+static MunitResult
+test_eq(const  MunitParameter params[],
+        void  *user_data_or_fixture)
+{
+  string_view_t a = string_view_from_str("hello");
+  string_view_t b = string_view_from_str("world");
+
+  assert_false(string_view_eq(a, b));
+
+  b = string_view_from_str("hello");
+
+  assert_true(string_view_eq(a, b));
+
+  return MUNIT_OK;
+}
+
+static MunitTest tests[] = {
+  { "/test_create_new", test_create_new, NULL, NULL, MUNIT_TEST_OPTION_NONE, NULL },
+  { "/test_from_str", test_from_str, NULL, NULL, MUNIT_TEST_OPTION_NONE, NULL },
+  { "/test_to_str", test_to_str, NULL, NULL, MUNIT_TEST_OPTION_NONE, NULL },
+  { "/test_eq", test_eq, NULL, NULL, MUNIT_TEST_OPTION_NONE, NULL },
+  { NULL, NULL, NULL, NULL, MUNIT_TEST_OPTION_NONE, NULL }
+};
+
+static const MunitSuite suite = {
+  "/string_view", tests, NULL, 1, MUNIT_SUITE_OPTION_NONE
+};
+
+int
+main(int argc, char *argv[])
+{
+  return munit_suite_main(&suite, NULL, argc, argv);
+  return EXIT_SUCCESS;
+}
-- 
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