1 files changed, 261 insertions, 0 deletions
diff --git a/intl/components/gtest/TestString.cpp b/intl/components/gtest/TestString.cpp
new file mode 100644
index 0000000000..f97fafb0b4
--- /dev/null
+++ b/intl/components/gtest/TestString.cpp
@@ -0,0 +1,261 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+#include "gtest/gtest.h"
+
+#include "mozilla/intl/String.h"
+#include "mozilla/Span.h"
+#include "mozilla/TextUtils.h"
+#include "mozilla/Try.h"
+
+#include <algorithm>
+
+#include "TestBuffer.h"
+
+namespace mozilla::intl {
+
+static Result<std::u16string_view, ICUError> ToLocaleLowerCase(
+    const char* aLocale, const char16_t* aString,
+    TestBuffer<char16_t>& aBuffer) {
+  aBuffer.clear();
+
+  MOZ_TRY(String::ToLocaleLowerCase(aLocale, MakeStringSpan(aString), aBuffer));
+
+  return aBuffer.get_string_view();
+}
+
+static Result<std::u16string_view, ICUError> ToLocaleUpperCase(
+    const char* aLocale, const char16_t* aString,
+    TestBuffer<char16_t>& aBuffer) {
+  aBuffer.clear();
+
+  MOZ_TRY(String::ToLocaleUpperCase(aLocale, MakeStringSpan(aString), aBuffer));
+
+  return aBuffer.get_string_view();
+}
+
+TEST(IntlString, ToLocaleLowerCase)
+{
+  TestBuffer<char16_t> buf;
+
+  ASSERT_EQ(ToLocaleLowerCase("en", u"test", buf).unwrap(), u"test");
+  ASSERT_EQ(ToLocaleLowerCase("en", u"TEST", buf).unwrap(), u"test");
+
+  // Turkish dotless i.
+  ASSERT_EQ(ToLocaleLowerCase("tr", u"I", buf).unwrap(), u"ı");
+  ASSERT_EQ(ToLocaleLowerCase("tr", u"İ", buf).unwrap(), u"i");
+  ASSERT_EQ(ToLocaleLowerCase("tr", u"I\u0307", buf).unwrap(), u"i");
+}
+
+TEST(IntlString, ToLocaleUpperCase)
+{
+  TestBuffer<char16_t> buf;
+
+  ASSERT_EQ(ToLocaleUpperCase("en", u"test", buf).unwrap(), u"TEST");
+  ASSERT_EQ(ToLocaleUpperCase("en", u"TEST", buf).unwrap(), u"TEST");
+
+  // Turkish dotless i.
+  ASSERT_EQ(ToLocaleUpperCase("tr", u"i", buf).unwrap(), u"İ");
+  ASSERT_EQ(ToLocaleUpperCase("tr", u"ı", buf).unwrap(), u"I");
+
+  // Output can be longer than the input string.
+  ASSERT_EQ(ToLocaleUpperCase("en", u"Größenmaßstäbe", buf).unwrap(),
+            u"GRÖSSENMASSSTÄBE");
+}
+
+TEST(IntlString, NormalizeNFC)
+{
+  using namespace std::literals;
+
+  using NormalizationForm = String::NormalizationForm;
+  using AlreadyNormalized = String::AlreadyNormalized;
+
+  TestBuffer<char16_t> buf;
+
+  auto alreadyNormalized =
+      String::Normalize(NormalizationForm::NFC, u""sv, buf);
+  ASSERT_EQ(alreadyNormalized.unwrap(), AlreadyNormalized::Yes);
+  ASSERT_EQ(buf.get_string_view(), u"");
+
+  alreadyNormalized =
+      String::Normalize(NormalizationForm::NFC, u"abcdef"sv, buf);
+  ASSERT_EQ(alreadyNormalized.unwrap(), AlreadyNormalized::Yes);
+  ASSERT_EQ(buf.get_string_view(), u"");
+
+  alreadyNormalized =
+      String::Normalize(NormalizationForm::NFC, u"a\u0308"sv, buf);
+  ASSERT_EQ(alreadyNormalized.unwrap(), AlreadyNormalized::No);
+  ASSERT_EQ(buf.get_string_view(), u"ä");
+
+  buf.clear();
+
+  alreadyNormalized = String::Normalize(NormalizationForm::NFC, u"½"sv, buf);
+  ASSERT_EQ(alreadyNormalized.unwrap(), AlreadyNormalized::Yes);
+  ASSERT_EQ(buf.get_string_view(), u"");
+}
+
+TEST(IntlString, NormalizeNFD)
+{
+  using namespace std::literals;
+
+  using NormalizationForm = String::NormalizationForm;
+  using AlreadyNormalized = String::AlreadyNormalized;
+
+  TestBuffer<char16_t> buf;
+
+  auto alreadyNormalized =
+      String::Normalize(NormalizationForm::NFD, u""sv, buf);
+  ASSERT_EQ(alreadyNormalized.unwrap(), AlreadyNormalized::Yes);
+  ASSERT_EQ(buf.get_string_view(), u"");
+
+  alreadyNormalized =
+      String::Normalize(NormalizationForm::NFD, u"abcdef"sv, buf);
+  ASSERT_EQ(alreadyNormalized.unwrap(), AlreadyNormalized::Yes);
+  ASSERT_EQ(buf.get_string_view(), u"");
+
+  alreadyNormalized = String::Normalize(NormalizationForm::NFD, u"ä"sv, buf);
+  ASSERT_EQ(alreadyNormalized.unwrap(), AlreadyNormalized::No);
+  ASSERT_EQ(buf.get_string_view(), u"a\u0308");
+
+  buf.clear();
+
+  alreadyNormalized = String::Normalize(NormalizationForm::NFD, u"½"sv, buf);
+  ASSERT_EQ(alreadyNormalized.unwrap(), AlreadyNormalized::Yes);
+  ASSERT_EQ(buf.get_string_view(), u"");
+
+  // Test with inline capacity.
+  TestBuffer<char16_t, 2> buf2;
+
+  alreadyNormalized = String::Normalize(NormalizationForm::NFD, u" ç"sv, buf2);
+  ASSERT_EQ(alreadyNormalized.unwrap(), AlreadyNormalized::No);
+  ASSERT_EQ(buf2.get_string_view(), u" c\u0327");
+}
+
+TEST(IntlString, NormalizeNFKC)
+{
+  using namespace std::literals;
+
+  using NormalizationForm = String::NormalizationForm;
+  using AlreadyNormalized = String::AlreadyNormalized;
+
+  TestBuffer<char16_t> buf;
+
+  auto alreadyNormalized =
+      String::Normalize(NormalizationForm::NFKC, u""sv, buf);
+  ASSERT_EQ(alreadyNormalized.unwrap(), AlreadyNormalized::Yes);
+  ASSERT_EQ(buf.get_string_view(), u"");
+
+  alreadyNormalized =
+      String::Normalize(NormalizationForm::NFKC, u"abcdef"sv, buf);
+  ASSERT_EQ(alreadyNormalized.unwrap(), AlreadyNormalized::Yes);
+  ASSERT_EQ(buf.get_string_view(), u"");
+
+  alreadyNormalized =
+      String::Normalize(NormalizationForm::NFKC, u"a\u0308"sv, buf);
+  ASSERT_EQ(alreadyNormalized.unwrap(), AlreadyNormalized::No);
+  ASSERT_EQ(buf.get_string_view(), u"ä");
+
+  buf.clear();
+
+  alreadyNormalized = String::Normalize(NormalizationForm::NFKC, u"½"sv, buf);
+  ASSERT_EQ(alreadyNormalized.unwrap(), AlreadyNormalized::No);
+  ASSERT_EQ(buf.get_string_view(), u"1⁄2");
+}
+
+TEST(IntlString, NormalizeNFKD)
+{
+  using namespace std::literals;
+
+  using NormalizationForm = String::NormalizationForm;
+  using AlreadyNormalized = String::AlreadyNormalized;
+
+  TestBuffer<char16_t> buf;
+
+  auto alreadyNormalized =
+      String::Normalize(NormalizationForm::NFKD, u""sv, buf);
+  ASSERT_EQ(alreadyNormalized.unwrap(), AlreadyNormalized::Yes);
+  ASSERT_EQ(buf.get_string_view(), u"");
+
+  alreadyNormalized =
+      String::Normalize(NormalizationForm::NFKD, u"abcdef"sv, buf);
+  ASSERT_EQ(alreadyNormalized.unwrap(), AlreadyNormalized::Yes);
+  ASSERT_EQ(buf.get_string_view(), u"");
+
+  alreadyNormalized = String::Normalize(NormalizationForm::NFKD, u"ä"sv, buf);
+  ASSERT_EQ(alreadyNormalized.unwrap(), AlreadyNormalized::No);
+  ASSERT_EQ(buf.get_string_view(), u"a\u0308");
+
+  buf.clear();
+
+  alreadyNormalized = String::Normalize(NormalizationForm::NFKD, u"½"sv, buf);
+  ASSERT_EQ(alreadyNormalized.unwrap(), AlreadyNormalized::No);
+  ASSERT_EQ(buf.get_string_view(), u"1⁄2");
+}
+
+TEST(IntlString, ComposePairNFC)
+{
+  // Pair of base characters do not compose
+  ASSERT_EQ(String::ComposePairNFC(U'a', U'b'), U'\0');
+  // Base letter + accent
+  ASSERT_EQ(String::ComposePairNFC(U'a', U'\u0308'), U'ä');
+  // Accented letter + a further accent
+  ASSERT_EQ(String::ComposePairNFC(U'ä', U'\u0304'), U'ǟ');
+  // Accented letter + a further accent, but doubly-accented form is not
+  // available
+  ASSERT_EQ(String::ComposePairNFC(U'ä', U'\u0301'), U'\0');
+  // These do not compose because although U+0344 has the decomposition <0308,
+  // 0301> (see below), it also has the Full_Composition_Exclusion property.
+  ASSERT_EQ(String::ComposePairNFC(U'\u0308', U'\u0301'), U'\0');
+  // Supplementary-plane letter + accent
+  ASSERT_EQ(String::ComposePairNFC(U'\U00011099', U'\U000110BA'),
+            U'\U0001109A');
+}
+
+TEST(IntlString, DecomposeRawNFD)
+{
+  char32_t buf[2];
+  // Non-decomposable character
+  ASSERT_EQ(String::DecomposeRawNFD(U'a', buf), 0);
+  // Singleton decomposition
+  ASSERT_EQ(String::DecomposeRawNFD(U'\u212A', buf), 1);
+  ASSERT_EQ(buf[0], U'K');
+  // Simple accented letter
+  ASSERT_EQ(String::DecomposeRawNFD(U'ä', buf), 2);
+  ASSERT_EQ(buf[0], U'a');
+  ASSERT_EQ(buf[1], U'\u0308');
+  // Double-accented letter decomposes by only one level
+  ASSERT_EQ(String::DecomposeRawNFD(U'ǟ', buf), 2);
+  ASSERT_EQ(buf[0], U'ä');
+  ASSERT_EQ(buf[1], U'\u0304');
+  // Non-starter can decompose, but will not recompose (see above)
+  ASSERT_EQ(String::DecomposeRawNFD(U'\u0344', buf), 2);
+  ASSERT_EQ(buf[0], U'\u0308');
+  ASSERT_EQ(buf[1], U'\u0301');
+  // Supplementary-plane letter with decomposition
+  ASSERT_EQ(String::DecomposeRawNFD(U'\U0001109A', buf), 2);
+  ASSERT_EQ(buf[0], U'\U00011099');
+  ASSERT_EQ(buf[1], U'\U000110BA');
+}
+
+TEST(IntlString, IsCased)
+{
+  ASSERT_TRUE(String::IsCased(U'a'));
+  ASSERT_FALSE(String::IsCased(U'0'));
+}
+
+TEST(IntlString, IsCaseIgnorable)
+{
+  ASSERT_FALSE(String::IsCaseIgnorable(U'a'));
+  ASSERT_TRUE(String::IsCaseIgnorable(U'.'));
+}
+
+TEST(IntlString, GetUnicodeVersion)
+{
+  auto version = String::GetUnicodeVersion();
+
+  ASSERT_TRUE(std::all_of(version.begin(), version.end(), [](char ch) {
+    return IsAsciiDigit(ch) || ch == '.';
+  }));
+}
+
+}  // namespace mozilla::intl