// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "third_party/blink/public/platform/web_string.h"

#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/blink/renderer/platform/wtf/text/wtf_string.h"

namespace blink {

TEST(WebStringTest, UTF8ConversionRoundTrip) {
  // Valid characters.
  for (WebUChar uchar = 0; uchar <= 0xD7FF; ++uchar) {
    WebString utf16_string(std::u16string_view(&uchar, 1));
    std::string utf8_string(utf16_string.Utf8());
    WebString utf16_new_string = WebString::FromUtf8(utf8_string);
    EXPECT_FALSE(utf16_new_string.IsNull());
    EXPECT_TRUE(utf16_string == utf16_new_string);
  }

  // Unpaired surrogates.
  for (WebUChar uchar = 0xD800; uchar <= 0xDFFF; ++uchar) {
    WebString utf16_string(std::u16string_view(&uchar, 1));

    // Conversion with Strict mode results in an empty string.
    std::string utf8_string(
        utf16_string.Utf8(WebString::Utf8ConversionMode::kStrict));
    EXPECT_TRUE(utf8_string.empty());

    // Unpaired surrogates can't be converted back in Lenient mode.
    utf8_string = utf16_string.Utf8(WebString::Utf8ConversionMode::kLenient);
    EXPECT_FALSE(utf8_string.empty());
    WebString utf16_new_string = WebString::FromUtf8(utf8_string);
    EXPECT_TRUE(utf16_new_string.IsNull());

    // Round-trip works with StrictReplacingErrors mode.
    utf8_string = utf16_string.Utf8(
        WebString::Utf8ConversionMode::kStrictReplacingErrors);
    EXPECT_FALSE(utf8_string.empty());
    utf16_new_string = WebString::FromUtf8(utf8_string);
    EXPECT_FALSE(utf16_new_string.IsNull());
    EXPECT_FALSE(utf16_string == utf16_new_string);
  }
}

}  // namespace blink