text/WTFStringTest.cpp

/*
 * Copyright (C) 2012 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "wtf/text/WTFString.h"

#include "testing/gtest/include/gtest/gtest.h"
#include "wtf/MathExtras.h"
#include "wtf/text/CString.h"
#include <limits>

namespace WTF {

TEST(StringTest, CreationFromLiteral) {
  String stringFromLiteral("Explicit construction syntax");
  EXPECT_EQ(strlen("Explicit construction syntax"), stringFromLiteral.length());
  EXPECT_TRUE(stringFromLiteral == "Explicit construction syntax");
  EXPECT_TRUE(stringFromLiteral.is8Bit());
  EXPECT_TRUE(String("Explicit construction syntax") == stringFromLiteral);
}

TEST(StringTest, ASCII) {
  CString output;

  // Null String.
  output = String().ascii();
  EXPECT_STREQ("", output.data());

  // Empty String.
  output = emptyString.ascii();
  EXPECT_STREQ("", output.data());

  // Regular String.
  output = String("foobar").ascii();
  EXPECT_STREQ("foobar", output.data());
}

namespace {

void testNumberToStringECMAScript(double number, const char* reference) {
  CString numberString = String::numberToStringECMAScript(number).latin1();
  EXPECT_STREQ(reference, numberString.data());
}

}  // anonymous namespace

TEST(StringTest, NumberToStringECMAScriptBoundaries) {
  typedef std::numeric_limits<double> Limits;

  // Infinity.
  testNumberToStringECMAScript(Limits::infinity(), "Infinity");
  testNumberToStringECMAScript(-Limits::infinity(), "-Infinity");

  // NaN.
  testNumberToStringECMAScript(-Limits::quiet_NaN(), "NaN");

  // Zeros.
  testNumberToStringECMAScript(0, "0");
  testNumberToStringECMAScript(-0, "0");

  // Min-Max.
  testNumberToStringECMAScript(Limits::min(), "2.2250738585072014e-308");
  testNumberToStringECMAScript(Limits::max(), "1.7976931348623157e+308");
}

TEST(StringTest, NumberToStringECMAScriptRegularNumbers) {
  // Pi.
  testNumberToStringECMAScript(piDouble, "3.141592653589793");
  testNumberToStringECMAScript(piFloat, "3.1415927410125732");
  testNumberToStringECMAScript(piOverTwoDouble, "1.5707963267948966");
  testNumberToStringECMAScript(piOverTwoFloat, "1.5707963705062866");
  testNumberToStringECMAScript(piOverFourDouble, "0.7853981633974483");
  testNumberToStringECMAScript(piOverFourFloat, "0.7853981852531433");

  // e.
  const double e = 2.71828182845904523536028747135266249775724709369995;
  testNumberToStringECMAScript(e, "2.718281828459045");

  // c, speed of light in m/s.
  const double c = 299792458;
  testNumberToStringECMAScript(c, "299792458");

  // Golen ratio.
  const double phi = 1.6180339887498948482;
  testNumberToStringECMAScript(phi, "1.618033988749895");
}

TEST(StringTest, ReplaceWithLiteral) {
  // Cases for 8Bit source.
  String testString = "1224";
  EXPECT_TRUE(testString.is8Bit());
  testString.replace('2', "");
  EXPECT_STREQ("14", testString.utf8().data());

  testString = "1224";
  EXPECT_TRUE(testString.is8Bit());
  testString.replace('2', "3");
  EXPECT_STREQ("1334", testString.utf8().data());

  testString = "1224";
  EXPECT_TRUE(testString.is8Bit());
  testString.replace('2', "555");
  EXPECT_STREQ("15555554", testString.utf8().data());

  testString = "1224";
  EXPECT_TRUE(testString.is8Bit());
  testString.replace('3', "NotFound");
  EXPECT_STREQ("1224", testString.utf8().data());

  // Cases for 16Bit source.
  // U+00E9 (=0xC3 0xA9 in UTF-8) is e with accent.
  testString = String::fromUTF8("r\xC3\xA9sum\xC3\xA9");
  EXPECT_FALSE(testString.is8Bit());
  testString.replace(UChar(0x00E9), "e");
  EXPECT_STREQ("resume", testString.utf8().data());

  testString = String::fromUTF8("r\xC3\xA9sum\xC3\xA9");
  EXPECT_FALSE(testString.is8Bit());
  testString.replace(UChar(0x00E9), "");
  EXPECT_STREQ("rsum", testString.utf8().data());

  testString = String::fromUTF8("r\xC3\xA9sum\xC3\xA9");
  EXPECT_FALSE(testString.is8Bit());
  testString.replace('3', "NotFound");
  EXPECT_STREQ("r\xC3\xA9sum\xC3\xA9", testString.utf8().data());
}

TEST(StringTest, ComparisonOfSameStringVectors) {
  Vector<String> stringVector;
  stringVector.push_back("one");
  stringVector.push_back("two");

  Vector<String> sameStringVector;
  sameStringVector.push_back("one");
  sameStringVector.push_back("two");

  EXPECT_EQ(stringVector, sameStringVector);
}

TEST(WTF, SimplifyWhiteSpace) {
  String extraSpaces("  Hello  world  ");
  EXPECT_EQ(String("Hello world"), extraSpaces.simplifyWhiteSpace());
  EXPECT_EQ(String("  Hello  world  "),
            extraSpaces.simplifyWhiteSpace(WTF::DoNotStripWhiteSpace));

  String extraSpacesAndNewlines(" \nHello\n world\n ");
  EXPECT_EQ(String("Hello world"), extraSpacesAndNewlines.simplifyWhiteSpace());
  EXPECT_EQ(
      String("  Hello  world  "),
      extraSpacesAndNewlines.simplifyWhiteSpace(WTF::DoNotStripWhiteSpace));

  String extraSpacesAndTabs(" \nHello\t world\t ");
  EXPECT_EQ(String("Hello world"), extraSpacesAndTabs.simplifyWhiteSpace());
  EXPECT_EQ(String("  Hello  world  "),
            extraSpacesAndTabs.simplifyWhiteSpace(WTF::DoNotStripWhiteSpace));
}

struct CaseFoldingTestData {
  const char* sourceDescription;
  const char* source;
  const char** localeList;
  size_t localeListLength;
  const char* expected;
};

// \xC4\xB0 = U+0130 (capital dotted I)
// \xC4\xB1 = U+0131 (lowercase dotless I)
const char* turkicInput = "Isi\xC4\xB0 \xC4\xB0s\xC4\xB1I";
const char* greekInput =
    "\xCE\x9F\xCE\x94\xCE\x8C\xCE\xA3 \xCE\x9F\xCE\xB4\xCF\x8C\xCF\x82 "
    "\xCE\xA3\xCE\xBF \xCE\xA3\xCE\x9F o\xCE\xA3 \xCE\x9F\xCE\xA3 \xCF\x83 "
    "\xE1\xBC\x95\xCE\xBE";
const char* lithuanianInput =
    "I \xC3\x8F J J\xCC\x88 \xC4\xAE \xC4\xAE\xCC\x88 \xC3\x8C \xC3\x8D "
    "\xC4\xA8 xi\xCC\x87\xCC\x88 xj\xCC\x87\xCC\x88 x\xC4\xAF\xCC\x87\xCC\x88 "
    "xi\xCC\x87\xCC\x80 xi\xCC\x87\xCC\x81 xi\xCC\x87\xCC\x83 XI X\xC3\x8F XJ "
    "XJ\xCC\x88 X\xC4\xAE X\xC4\xAE\xCC\x88";

const char* turkicLocales[] = {
    "tr", "tr-TR", "tr_TR", "tr@foo=bar", "tr-US", "TR", "tr-tr", "tR",
    "az", "az-AZ", "az_AZ", "az@foo=bar", "az-US", "Az", "AZ-AZ",
};
const char* nonTurkicLocales[] = {
    "en", "en-US", "en_US", "en@foo=bar", "EN", "En",
    "ja", "el",    "fil",   "fi",         "lt",
};
const char* greekLocales[] = {
    "el", "el-GR", "el_GR", "el@foo=bar", "el-US", "EL", "el-gr", "eL",
};
const char* nonGreekLocales[] = {
    "en", "en-US", "en_US", "en@foo=bar", "EN", "En",
    "ja", "tr",    "az",    "fil",        "fi", "lt",
};
const char* lithuanianLocales[] = {
    "lt", "lt-LT", "lt_LT", "lt@foo=bar", "lt-US", "LT", "lt-lt", "lT",
};
// Should not have "tr" or "az" because "lt" and 'tr/az' rules conflict with
// each other.
const char* nonLithuanianLocales[] = {
    "en", "en-US", "en_US", "en@foo=bar", "EN", "En", "ja", "fil", "fi", "el",
};

TEST(StringTest, ToUpperLocale) {
  CaseFoldingTestData testDataList[] = {
      {
          "Turkic input", turkicInput, turkicLocales,
          sizeof(turkicLocales) / sizeof(const char*),
          "IS\xC4\xB0\xC4\xB0 \xC4\xB0SII",
      },
      {
          "Turkic input", turkicInput, nonTurkicLocales,
          sizeof(nonTurkicLocales) / sizeof(const char*),
          "ISI\xC4\xB0 \xC4\xB0SII",
      },
      {
          "Greek input", greekInput, greekLocales,
          sizeof(greekLocales) / sizeof(const char*),
          "\xCE\x9F\xCE\x94\xCE\x9F\xCE\xA3 \xCE\x9F\xCE\x94\xCE\x9F\xCE\xA3 "
          "\xCE\xA3\xCE\x9F \xCE\xA3\xCE\x9F \x4F\xCE\xA3 \xCE\x9F\xCE\xA3 "
          "\xCE\xA3 \xCE\x95\xCE\x9E",
      },
      {
          "Greek input", greekInput, nonGreekLocales,
          sizeof(nonGreekLocales) / sizeof(const char*),
          "\xCE\x9F\xCE\x94\xCE\x8C\xCE\xA3 \xCE\x9F\xCE\x94\xCE\x8C\xCE\xA3 "
          "\xCE\xA3\xCE\x9F \xCE\xA3\xCE\x9F \x4F\xCE\xA3 \xCE\x9F\xCE\xA3 "
          "\xCE\xA3 \xE1\xBC\x9D\xCE\x9E",
      },
      {
          "Lithuanian input", lithuanianInput, lithuanianLocales,
          sizeof(lithuanianLocales) / sizeof(const char*),
          "I \xC3\x8F J J\xCC\x88 \xC4\xAE \xC4\xAE\xCC\x88 \xC3\x8C \xC3\x8D "
          "\xC4\xA8 XI\xCC\x88 XJ\xCC\x88 X\xC4\xAE\xCC\x88 XI\xCC\x80 "
          "XI\xCC\x81 XI\xCC\x83 XI X\xC3\x8F XJ XJ\xCC\x88 X\xC4\xAE "
          "X\xC4\xAE\xCC\x88",
      },
      {
          "Lithuanian input", lithuanianInput, nonLithuanianLocales,
          sizeof(nonLithuanianLocales) / sizeof(const char*),
          "I \xC3\x8F J J\xCC\x88 \xC4\xAE \xC4\xAE\xCC\x88 \xC3\x8C \xC3\x8D "
          "\xC4\xA8 XI\xCC\x87\xCC\x88 XJ\xCC\x87\xCC\x88 "
          "X\xC4\xAE\xCC\x87\xCC\x88 XI\xCC\x87\xCC\x80 XI\xCC\x87\xCC\x81 "
          "XI\xCC\x87\xCC\x83 XI X\xC3\x8F XJ XJ\xCC\x88 X\xC4\xAE "
          "X\xC4\xAE\xCC\x88",
      },
  };

  for (size_t i = 0; i < sizeof(testDataList) / sizeof(testDataList[0]); ++i) {
    const char* expected = testDataList[i].expected;
    String source = String::fromUTF8(testDataList[i].source);
    for (size_t j = 0; j < testDataList[i].localeListLength; ++j) {
      const char* locale = testDataList[i].localeList[j];
      EXPECT_STREQ(expected, source.upper(locale).utf8().data())
          << testDataList[i].sourceDescription << "; locale=" << locale;
    }
  }
}

TEST(StringTest, ToLowerLocale) {
  CaseFoldingTestData testDataList[] = {
      {
          "Turkic input", turkicInput, turkicLocales,
          sizeof(turkicLocales) / sizeof(const char*),
          "\xC4\xB1sii is\xC4\xB1\xC4\xB1",
      },
      {
          "Turkic input", turkicInput, nonTurkicLocales,
          sizeof(nonTurkicLocales) / sizeof(const char*),
          // U+0130 is lowercased to U+0069 followed by U+0307
          "isii\xCC\x87 i\xCC\x87s\xC4\xB1i",
      },
      {
          "Greek input", greekInput, greekLocales,
          sizeof(greekLocales) / sizeof(const char*),
          "\xCE\xBF\xCE\xB4\xCF\x8C\xCF\x82 \xCE\xBF\xCE\xB4\xCF\x8C\xCF\x82 "
          "\xCF\x83\xCE\xBF \xCF\x83\xCE\xBF \x6F\xCF\x82 \xCE\xBF\xCF\x82 "
          "\xCF\x83 \xE1\xBC\x95\xCE\xBE",
      },
      {
          "Greek input", greekInput, nonGreekLocales,
          sizeof(greekLocales) / sizeof(const char*),
          "\xCE\xBF\xCE\xB4\xCF\x8C\xCF\x82 \xCE\xBF\xCE\xB4\xCF\x8C\xCF\x82 "
          "\xCF\x83\xCE\xBF \xCF\x83\xCE\xBF \x6F\xCF\x82 \xCE\xBF\xCF\x82 "
          "\xCF\x83 \xE1\xBC\x95\xCE\xBE",
      },
      {
          "Lithuanian input", lithuanianInput, lithuanianLocales,
          sizeof(lithuanianLocales) / sizeof(const char*),
          "i \xC3\xAF j j\xCC\x87\xCC\x88 \xC4\xAF \xC4\xAF\xCC\x87\xCC\x88 "
          "i\xCC\x87\xCC\x80 i\xCC\x87\xCC\x81 i\xCC\x87\xCC\x83 "
          "xi\xCC\x87\xCC\x88 xj\xCC\x87\xCC\x88 x\xC4\xAF\xCC\x87\xCC\x88 "
          "xi\xCC\x87\xCC\x80 xi\xCC\x87\xCC\x81 xi\xCC\x87\xCC\x83 xi "
          "x\xC3\xAF xj xj\xCC\x87\xCC\x88 x\xC4\xAF x\xC4\xAF\xCC\x87\xCC\x88",
      },
      {
          "Lithuanian input", lithuanianInput, nonLithuanianLocales,
          sizeof(nonLithuanianLocales) / sizeof(const char*),
          "\x69 \xC3\xAF \x6A \x6A\xCC\x88 \xC4\xAF \xC4\xAF\xCC\x88 \xC3\xAC "
          "\xC3\xAD \xC4\xA9 \x78\x69\xCC\x87\xCC\x88 \x78\x6A\xCC\x87\xCC\x88 "
          "\x78\xC4\xAF\xCC\x87\xCC\x88 \x78\x69\xCC\x87\xCC\x80 "
          "\x78\x69\xCC\x87\xCC\x81 \x78\x69\xCC\x87\xCC\x83 \x78\x69 "
          "\x78\xC3\xAF \x78\x6A \x78\x6A\xCC\x88 \x78\xC4\xAF "
          "\x78\xC4\xAF\xCC\x88",
      },
  };

  for (size_t i = 0; i < sizeof(testDataList) / sizeof(testDataList[0]); ++i) {
    const char* expected = testDataList[i].expected;
    String source = String::fromUTF8(testDataList[i].source);
    for (size_t j = 0; j < testDataList[i].localeListLength; ++j) {
      const char* locale = testDataList[i].localeList[j];
      EXPECT_STREQ(expected, source.lower(locale).utf8().data())
          << testDataList[i].sourceDescription << "; locale=" << locale;
    }
  }
}

TEST(StringTest, StartsWithIgnoringUnicodeCase) {
  // [U+017F U+212A i a] starts with "sk".
  EXPECT_TRUE(String::fromUTF8("\xC5\xBF\xE2\x84\xAAia")
                  .startsWith("sk", TextCaseUnicodeInsensitive));
}

TEST(StringTest, StartsWithIgnoringASCIICase) {
  String allASCII("LINK");
  String allASCIILowerCase("link");
  EXPECT_TRUE(allASCII.startsWith(allASCIILowerCase, TextCaseASCIIInsensitive));
  String allASCIIMixedCase("lInK");
  EXPECT_TRUE(allASCII.startsWith(allASCIIMixedCase, TextCaseASCIIInsensitive));
  String allASCIIDifferent("foo");
  EXPECT_FALSE(
      allASCII.startsWith(allASCIIDifferent, TextCaseASCIIInsensitive));
  String nonASCII = String::fromUTF8("LIN\xE2\x84\xAA");
  EXPECT_FALSE(allASCII.startsWith(nonASCII, TextCaseASCIIInsensitive));
  EXPECT_TRUE(allASCII.startsWith(nonASCII.lower(), TextCaseASCIIInsensitive));

  EXPECT_FALSE(nonASCII.startsWith(allASCII, TextCaseASCIIInsensitive));
  EXPECT_FALSE(
      nonASCII.startsWith(allASCIILowerCase, TextCaseASCIIInsensitive));
  EXPECT_FALSE(
      nonASCII.startsWith(allASCIIMixedCase, TextCaseASCIIInsensitive));
  EXPECT_FALSE(
      nonASCII.startsWith(allASCIIDifferent, TextCaseASCIIInsensitive));
}

TEST(StringTest, EndsWithIgnoringASCIICase) {
  String allASCII("LINK");
  String allASCIILowerCase("link");
  EXPECT_TRUE(allASCII.endsWith(allASCIILowerCase, TextCaseASCIIInsensitive));
  String allASCIIMixedCase("lInK");
  EXPECT_TRUE(allASCII.endsWith(allASCIIMixedCase, TextCaseASCIIInsensitive));
  String allASCIIDifferent("foo");
  EXPECT_FALSE(allASCII.endsWith(allASCIIDifferent, TextCaseASCIIInsensitive));
  String nonASCII = String::fromUTF8("LIN\xE2\x84\xAA");
  EXPECT_FALSE(allASCII.endsWith(nonASCII, TextCaseASCIIInsensitive));
  EXPECT_TRUE(allASCII.endsWith(nonASCII.lower(), TextCaseASCIIInsensitive));

  EXPECT_FALSE(nonASCII.endsWith(allASCII, TextCaseASCIIInsensitive));
  EXPECT_FALSE(nonASCII.endsWith(allASCIILowerCase, TextCaseASCIIInsensitive));
  EXPECT_FALSE(nonASCII.endsWith(allASCIIMixedCase, TextCaseASCIIInsensitive));
  EXPECT_FALSE(nonASCII.endsWith(allASCIIDifferent, TextCaseASCIIInsensitive));
}

TEST(StringTest, EqualIgnoringASCIICase) {
  String allASCII("LINK");
  String allASCIILowerCase("link");
  EXPECT_TRUE(equalIgnoringASCIICase(allASCII, allASCIILowerCase));
  String allASCIIMixedCase("lInK");
  EXPECT_TRUE(equalIgnoringASCIICase(allASCII, allASCIIMixedCase));
  String allASCIIDifferent("foo");
  EXPECT_FALSE(equalIgnoringASCIICase(allASCII, allASCIIDifferent));
  String nonASCII = String::fromUTF8("LIN\xE2\x84\xAA");
  EXPECT_FALSE(equalIgnoringASCIICase(allASCII, nonASCII));
  EXPECT_TRUE(equalIgnoringASCIICase(allASCII, nonASCII.lower()));

  EXPECT_FALSE(equalIgnoringASCIICase(nonASCII, allASCII));
  EXPECT_FALSE(equalIgnoringASCIICase(nonASCII, allASCIILowerCase));
  EXPECT_FALSE(equalIgnoringASCIICase(nonASCII, allASCIIMixedCase));
  EXPECT_FALSE(equalIgnoringASCIICase(nonASCII, allASCIIDifferent));
}

TEST(StringTest, FindIgnoringASCIICase) {
  String needle = String::fromUTF8("a\xCC\x88qa\xCC\x88");

  // Multiple matches, non-overlapping
  String haystack1 = String::fromUTF8(
      "aA\xCC\x88QA\xCC\x88sA\xCC\x88qa\xCC\x88rfi\xC3\xA4q\xC3\xA4");
  EXPECT_EQ(1u, haystack1.findIgnoringASCIICase(needle));
  EXPECT_EQ(7u, haystack1.findIgnoringASCIICase(needle, 2));
  EXPECT_EQ(kNotFound, haystack1.findIgnoringASCIICase(needle, 8));

  // Multiple matches, overlapping
  String haystack2 = String::fromUTF8("aA\xCC\x88QA\xCC\x88qa\xCC\x88rfi");
  EXPECT_EQ(1u, haystack2.findIgnoringASCIICase(needle));
  EXPECT_EQ(4u, haystack2.findIgnoringASCIICase(needle, 2));
  EXPECT_EQ(kNotFound, haystack2.findIgnoringASCIICase(needle, 5));
}

TEST(StringTest, Lower) {
  EXPECT_STREQ("link", String("LINK").lower().ascii().data());
  EXPECT_STREQ("link", String("lInk").lower().ascii().data());
  EXPECT_STREQ("lin\xE1k", String("lIn\xC1k").lower().latin1().data());
  // U+212A -> k
  EXPECT_STREQ("link",
               String::fromUTF8("LIN\xE2\x84\xAA").lower().utf8().data());
}

TEST(StringTest, Upper) {
  EXPECT_STREQ("CROSS", String("cross").upper().utf8().data());
  // U+017F -> S
  EXPECT_STREQ("CROSS", String::fromUTF8("cro\xC5\xBFs").upper().utf8().data());
}

TEST(StringTest, Ensure16Bit) {
  String string8("8bit");
  EXPECT_TRUE(string8.is8Bit());
  string8.ensure16Bit();
  EXPECT_FALSE(string8.is8Bit());
  EXPECT_EQ("8bit", string8);

  String string16(reinterpret_cast<const UChar*>(u"16bit"));
  EXPECT_FALSE(string16.is8Bit());
  string16.ensure16Bit();
  EXPECT_FALSE(string16.is8Bit());
  EXPECT_EQ("16bit", string16);

  String empty8(StringImpl::empty);
  EXPECT_TRUE(empty8.is8Bit());
  empty8.ensure16Bit();
  EXPECT_FALSE(empty8.is8Bit());
  EXPECT_TRUE(empty8.isEmpty());
  EXPECT_FALSE(empty8.isNull());

  String empty16(StringImpl::empty16Bit);
  EXPECT_FALSE(empty16.is8Bit());
  empty16.ensure16Bit();
  EXPECT_FALSE(empty16.is8Bit());
  EXPECT_TRUE(empty16.isEmpty());
  EXPECT_FALSE(empty16.isNull());

  String nullString;
  nullString.ensure16Bit();
  EXPECT_TRUE(nullString.isNull());
}

CString toCStringThroughPrinter(const String& string) {
  std::ostringstream output;
  output << string;
  const std::string& result = output.str();
  return CString(result.data(), result.length());
}

TEST(StringTest, StringPrinter) {
  EXPECT_EQ(CString("\"Hello!\""), toCStringThroughPrinter("Hello!"));
  EXPECT_EQ(CString("\"\\\"\""), toCStringThroughPrinter("\""));
  EXPECT_EQ(CString("\"\\\\\""), toCStringThroughPrinter("\\"));
  EXPECT_EQ(
      CString("\"\\u0000\\u0001\\u0002\\u0003\\u0004\\u0005\\u0006\\u0007\""),
      toCStringThroughPrinter(String("\x00\x01\x02\x03\x04\x05\x06\x07", 8)));
  EXPECT_EQ(
      CString("\"\\u0008\\t\\n\\u000B\\u000C\\r\\u000E\\u000F\""),
      toCStringThroughPrinter(String("\x08\x09\x0A\x0B\x0C\x0D\x0E\x0F", 8)));
  EXPECT_EQ(
      CString("\"\\u0010\\u0011\\u0012\\u0013\\u0014\\u0015\\u0016\\u0017\""),
      toCStringThroughPrinter(String("\x10\x11\x12\x13\x14\x15\x16\x17", 8)));
  EXPECT_EQ(
      CString("\"\\u0018\\u0019\\u001A\\u001B\\u001C\\u001D\\u001E\\u001F\""),
      toCStringThroughPrinter(String("\x18\x19\x1A\x1B\x1C\x1D\x1E\x1F", 8)));
  EXPECT_EQ(CString("\"\\u007F\\u0080\\u0081\""),
            toCStringThroughPrinter("\x7F\x80\x81"));
  EXPECT_EQ(CString("\"\""), toCStringThroughPrinter(emptyString));
  EXPECT_EQ(CString("<null>"), toCStringThroughPrinter(String()));

  static const UChar unicodeSample[] = {0x30C6, 0x30B9,
                                        0x30C8};  // "Test" in Japanese.
  EXPECT_EQ(CString("\"\\u30C6\\u30B9\\u30C8\""),
            toCStringThroughPrinter(
                String(unicodeSample, WTF_ARRAY_LENGTH(unicodeSample))));
}

}  // namespace WTF