Add common string utilities to libbase.

These are useful outside of ART. Nothing changed (aside from fixing
Trim to not segfault on empty strings), so ART should be able to move
to using these.

Change-Id: Id026ebffe8d31f784a91834786ab189680b13a0f

1 files changed, 142 insertions, 0 deletions

diff --git a/base/strings_test.cpp b/base/strings_test.cpp
new file mode 100644
index 0000000..824598d
--- /dev/null
+++ b/base/strings_test.cpp
@@ -0,0 +1,142 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "base/strings.h"
+
+#include <gtest/gtest.h>
+
+#include <string>
+#include <vector>
+
+TEST(strings, split_empty) {
+  std::vector<std::string> parts;
+  android::base::Split("", '\0', &parts);
+  ASSERT_EQ(0U, parts.size());
+}
+
+TEST(strings, split_single) {
+  std::vector<std::string> parts;
+  android::base::Split("foo", ',', &parts);
+  ASSERT_EQ(1U, parts.size());
+  ASSERT_EQ("foo", parts[0]);
+}
+
+TEST(strings, split_simple) {
+  std::vector<std::string> parts;
+  android::base::Split("foo,bar,baz", ',', &parts);
+  ASSERT_EQ(3U, parts.size());
+  ASSERT_EQ("foo", parts[0]);
+  ASSERT_EQ("bar", parts[1]);
+  ASSERT_EQ("baz", parts[2]);
+}
+
+TEST(strings, split_with_empty_part) {
+  std::vector<std::string> parts;
+  android::base::Split("foo,,bar", ',', &parts);
+  ASSERT_EQ(2U, parts.size());
+  ASSERT_EQ("foo", parts[0]);
+  ASSERT_EQ("bar", parts[1]);
+}
+
+TEST(strings, trim_empty) {
+  ASSERT_EQ("", android::base::Trim(""));
+}
+
+TEST(strings, trim_already_trimmed) {
+  ASSERT_EQ("foo", android::base::Trim("foo"));
+}
+
+TEST(strings, trim_left) {
+  ASSERT_EQ("foo", android::base::Trim(" foo"));
+}
+
+TEST(strings, trim_right) {
+  ASSERT_EQ("foo", android::base::Trim("foo "));
+}
+
+TEST(strings, trim_both) {
+  ASSERT_EQ("foo", android::base::Trim(" foo "));
+}
+
+TEST(strings, trim_no_trim_middle) {
+  ASSERT_EQ("foo bar", android::base::Trim("foo bar"));
+}
+
+TEST(strings, trim_other_whitespace) {
+  ASSERT_EQ("foo", android::base::Trim("\v\tfoo\n\f"));
+}
+
+TEST(strings, join_nothing) {
+  std::vector<std::string> list = {};
+  ASSERT_EQ("", android::base::Join(list, ','));
+}
+
+TEST(strings, join_single) {
+  std::vector<std::string> list = {"foo"};
+  ASSERT_EQ("foo", android::base::Join(list, ','));
+}
+
+TEST(strings, join_simple) {
+  std::vector<std::string> list = {"foo", "bar", "baz"};
+  ASSERT_EQ("foo,bar,baz", android::base::Join(list, ','));
+}
+
+TEST(strings, join_separator_in_vector) {
+  std::vector<std::string> list = {",", ","};
+  ASSERT_EQ(",,,", android::base::Join(list, ','));
+}
+
+TEST(strings, startswith_empty) {
+  ASSERT_FALSE(android::base::StartsWith("", "foo"));
+  ASSERT_TRUE(android::base::StartsWith("", ""));
+}
+
+TEST(strings, startswith_simple) {
+  ASSERT_TRUE(android::base::StartsWith("foo", ""));
+  ASSERT_TRUE(android::base::StartsWith("foo", "f"));
+  ASSERT_TRUE(android::base::StartsWith("foo", "fo"));
+  ASSERT_TRUE(android::base::StartsWith("foo", "foo"));
+}
+
+TEST(strings, startswith_prefix_too_long) {
+  ASSERT_FALSE(android::base::StartsWith("foo", "foobar"));
+}
+
+TEST(strings, startswith_contains_prefix) {
+  ASSERT_FALSE(android::base::StartsWith("foobar", "oba"));
+  ASSERT_FALSE(android::base::StartsWith("foobar", "bar"));
+}
+
+TEST(strings, endswith_empty) {
+  ASSERT_FALSE(android::base::EndsWith("", "foo"));
+  ASSERT_TRUE(android::base::EndsWith("", ""));
+}
+
+TEST(strings, endswith_simple) {
+  ASSERT_TRUE(android::base::EndsWith("foo", ""));
+  ASSERT_TRUE(android::base::EndsWith("foo", "o"));
+  ASSERT_TRUE(android::base::EndsWith("foo", "oo"));
+  ASSERT_TRUE(android::base::EndsWith("foo", "foo"));
+}
+
+TEST(strings, endswith_prefix_too_long) {
+  ASSERT_FALSE(android::base::EndsWith("foo", "foobar"));
+}
+
+TEST(strings, endswith_contains_prefix) {
+  ASSERT_FALSE(android::base::EndsWith("foobar", "oba"));
+  ASSERT_FALSE(android::base::EndsWith("foobar", "foo"));
+}