absl/strings/ascii_test.cc - third_party/abseil-cpp - Git at Google

 // Copyright 2017 The Abseil Authors.
 //
 // 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
 //
 //      https://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 "absl/strings/ascii.h"

 #include <algorithm>
 #include <cctype>
 #include <clocale>
 #include <cstring>
 #include <string>

 #include "gtest/gtest.h"
 #include "absl/base/macros.h"
 #include "absl/strings/string_view.h"

 namespace {

 TEST(AsciiIsFoo, All) {
   for (int i = 0; i < 256; i++) {
     const auto c = static_cast<unsigned char>(i);
     if ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z'))
       EXPECT_TRUE(absl::ascii_isalpha(c)) << ": failed on " << c;
     else
       EXPECT_TRUE(!absl::ascii_isalpha(c)) << ": failed on " << c;
   }
   for (int i = 0; i < 256; i++) {
     const auto c = static_cast<unsigned char>(i);
     if ((c >= '0' && c <= '9'))
       EXPECT_TRUE(absl::ascii_isdigit(c)) << ": failed on " << c;
     else
       EXPECT_TRUE(!absl::ascii_isdigit(c)) << ": failed on " << c;
   }
   for (int i = 0; i < 256; i++) {
     const auto c = static_cast<unsigned char>(i);
     if (absl::ascii_isalpha(c) || absl::ascii_isdigit(c))
       EXPECT_TRUE(absl::ascii_isalnum(c)) << ": failed on " << c;
     else
       EXPECT_TRUE(!absl::ascii_isalnum(c)) << ": failed on " << c;
   }
   for (int i = 0; i < 256; i++) {
     const auto c = static_cast<unsigned char>(i);
     if (i != '\0' && strchr(" \r\n\t\v\f", i))
       EXPECT_TRUE(absl::ascii_isspace(c)) << ": failed on " << c;
     else
       EXPECT_TRUE(!absl::ascii_isspace(c)) << ": failed on " << c;
   }
   for (int i = 0; i < 256; i++) {
     const auto c = static_cast<unsigned char>(i);
     if (i >= 32 && i < 127)
       EXPECT_TRUE(absl::ascii_isprint(c)) << ": failed on " << c;
     else
       EXPECT_TRUE(!absl::ascii_isprint(c)) << ": failed on " << c;
   }
   for (int i = 0; i < 256; i++) {
     const auto c = static_cast<unsigned char>(i);
     if (absl::ascii_isprint(c) && !absl::ascii_isspace(c) &&
         !absl::ascii_isalnum(c)) {
       EXPECT_TRUE(absl::ascii_ispunct(c)) << ": failed on " << c;
     } else {
       EXPECT_TRUE(!absl::ascii_ispunct(c)) << ": failed on " << c;
     }
   }
   for (int i = 0; i < 256; i++) {
     const auto c = static_cast<unsigned char>(i);
     if (i == ' ' || i == '\t')
       EXPECT_TRUE(absl::ascii_isblank(c)) << ": failed on " << c;
     else
       EXPECT_TRUE(!absl::ascii_isblank(c)) << ": failed on " << c;
   }
   for (int i = 0; i < 256; i++) {
     const auto c = static_cast<unsigned char>(i);
     if (i < 32 || i == 127)
       EXPECT_TRUE(absl::ascii_iscntrl(c)) << ": failed on " << c;
     else
       EXPECT_TRUE(!absl::ascii_iscntrl(c)) << ": failed on " << c;
   }
   for (int i = 0; i < 256; i++) {
     const auto c = static_cast<unsigned char>(i);
     if (absl::ascii_isdigit(c) || (i >= 'A' && i <= 'F') ||
         (i >= 'a' && i <= 'f')) {
       EXPECT_TRUE(absl::ascii_isxdigit(c)) << ": failed on " << c;
     } else {
       EXPECT_TRUE(!absl::ascii_isxdigit(c)) << ": failed on " << c;
     }
   }
   for (int i = 0; i < 256; i++) {
     const auto c = static_cast<unsigned char>(i);
     if (i > 32 && i < 127)
       EXPECT_TRUE(absl::ascii_isgraph(c)) << ": failed on " << c;
     else
       EXPECT_TRUE(!absl::ascii_isgraph(c)) << ": failed on " << c;
   }
   for (int i = 0; i < 256; i++) {
     const auto c = static_cast<unsigned char>(i);
     if (i >= 'A' && i <= 'Z')
       EXPECT_TRUE(absl::ascii_isupper(c)) << ": failed on " << c;
     else
       EXPECT_TRUE(!absl::ascii_isupper(c)) << ": failed on " << c;
   }
   for (int i = 0; i < 256; i++) {
     const auto c = static_cast<unsigned char>(i);
     if (i >= 'a' && i <= 'z')
       EXPECT_TRUE(absl::ascii_islower(c)) << ": failed on " << c;
     else
       EXPECT_TRUE(!absl::ascii_islower(c)) << ": failed on " << c;
   }
   for (unsigned char c = 0; c < 128; c++) {
     EXPECT_TRUE(absl::ascii_isascii(c)) << ": failed on " << c;
   }
   for (int i = 128; i < 256; i++) {
     const auto c = static_cast<unsigned char>(i);
     EXPECT_TRUE(!absl::ascii_isascii(c)) << ": failed on " << c;
   }
 }

 // Checks that absl::ascii_isfoo returns the same value as isfoo in the C
 // locale.
 TEST(AsciiIsFoo, SameAsIsFoo) {
 #ifndef __ANDROID__
   // temporarily change locale to C. It should already be C, but just for safety
   const char* old_locale = setlocale(LC_CTYPE, "C");
   ASSERT_TRUE(old_locale != nullptr);
 #endif

   for (int i = 0; i < 256; i++) {
     const auto c = static_cast<unsigned char>(i);
     EXPECT_EQ(isalpha(c) != 0, absl::ascii_isalpha(c)) << c;
     EXPECT_EQ(isdigit(c) != 0, absl::ascii_isdigit(c)) << c;
     EXPECT_EQ(isalnum(c) != 0, absl::ascii_isalnum(c)) << c;
     EXPECT_EQ(isspace(c) != 0, absl::ascii_isspace(c)) << c;
     EXPECT_EQ(ispunct(c) != 0, absl::ascii_ispunct(c)) << c;
     EXPECT_EQ(isblank(c) != 0, absl::ascii_isblank(c)) << c;
     EXPECT_EQ(iscntrl(c) != 0, absl::ascii_iscntrl(c)) << c;
     EXPECT_EQ(isxdigit(c) != 0, absl::ascii_isxdigit(c)) << c;
     EXPECT_EQ(isprint(c) != 0, absl::ascii_isprint(c)) << c;
     EXPECT_EQ(isgraph(c) != 0, absl::ascii_isgraph(c)) << c;
     EXPECT_EQ(isupper(c) != 0, absl::ascii_isupper(c)) << c;
     EXPECT_EQ(islower(c) != 0, absl::ascii_islower(c)) << c;
     EXPECT_EQ(isascii(c) != 0, absl::ascii_isascii(c)) << c;
   }

 #ifndef __ANDROID__
   // restore the old locale.
   ASSERT_TRUE(setlocale(LC_CTYPE, old_locale));
 #endif
 }

 TEST(AsciiToFoo, All) {
 #ifndef __ANDROID__
   // temporarily change locale to C. It should already be C, but just for safety
   const char* old_locale = setlocale(LC_CTYPE, "C");
   ASSERT_TRUE(old_locale != nullptr);
 #endif

   for (int i = 0; i < 256; i++) {
     const auto c = static_cast<unsigned char>(i);
     if (absl::ascii_islower(c))
       EXPECT_EQ(absl::ascii_toupper(c), 'A' + (i - 'a')) << c;
     else
       EXPECT_EQ(absl::ascii_toupper(c), static_cast<char>(i)) << c;

     if (absl::ascii_isupper(c))
       EXPECT_EQ(absl::ascii_tolower(c), 'a' + (i - 'A')) << c;
     else
       EXPECT_EQ(absl::ascii_tolower(c), static_cast<char>(i)) << c;

     // These CHECKs only hold in a C locale.
     EXPECT_EQ(static_cast<char>(tolower(i)), absl::ascii_tolower(c)) << c;
     EXPECT_EQ(static_cast<char>(toupper(i)), absl::ascii_toupper(c)) << c;
   }
 #ifndef __ANDROID__
   // restore the old locale.
   ASSERT_TRUE(setlocale(LC_CTYPE, old_locale));
 #endif
 }

 TEST(AsciiStrTo, Lower) {
   const char buf[] = "ABCDEF";
   const std::string str("GHIJKL");
   const std::string str2("MNOPQR");
   const absl::string_view sp(str2);
   std::string mutable_str("_`?@[{AMNOPQRSTUVWXYZ");

   EXPECT_EQ("abcdef", absl::AsciiStrToLower(buf));
   EXPECT_EQ("ghijkl", absl::AsciiStrToLower(str));
   EXPECT_EQ("mnopqr", absl::AsciiStrToLower(sp));

   absl::AsciiStrToLower(&mutable_str);
   EXPECT_EQ("_`?@[{amnopqrstuvwxyz", mutable_str);

   char mutable_buf[] = "Mutable";
   std::transform(mutable_buf, mutable_buf + strlen(mutable_buf),
                  mutable_buf, absl::ascii_tolower);
   EXPECT_STREQ("mutable", mutable_buf);
 }

 TEST(AsciiStrTo, Upper) {
   const char buf[] = "abcdef";
   const std::string str("ghijkl");
   const std::string str2("_`?@[{amnopqrstuvwxyz");
   const absl::string_view sp(str2);

   EXPECT_EQ("ABCDEF", absl::AsciiStrToUpper(buf));
   EXPECT_EQ("GHIJKL", absl::AsciiStrToUpper(str));
   EXPECT_EQ("_`?@[{AMNOPQRSTUVWXYZ", absl::AsciiStrToUpper(sp));

   char mutable_buf[] = "Mutable";
   std::transform(mutable_buf, mutable_buf + strlen(mutable_buf),
                  mutable_buf, absl::ascii_toupper);
   EXPECT_STREQ("MUTABLE", mutable_buf);
 }

 TEST(StripLeadingAsciiWhitespace, FromStringView) {
   EXPECT_EQ(absl::string_view{},
             absl::StripLeadingAsciiWhitespace(absl::string_view{}));
   EXPECT_EQ("foo", absl::StripLeadingAsciiWhitespace({"foo"}));
   EXPECT_EQ("foo", absl::StripLeadingAsciiWhitespace({"\t  \n\f\r\n\vfoo"}));
   EXPECT_EQ("foo foo\n ",
             absl::StripLeadingAsciiWhitespace({"\t  \n\f\r\n\vfoo foo\n "}));
   EXPECT_EQ(absl::string_view{}, absl::StripLeadingAsciiWhitespace(
                                      {"\t  \n\f\r\v\n\t  \n\f\r\v\n"}));
 }

 TEST(StripLeadingAsciiWhitespace, InPlace) {
   std::string str;

   absl::StripLeadingAsciiWhitespace(&str);
   EXPECT_EQ("", str);

   str = "foo";
   absl::StripLeadingAsciiWhitespace(&str);
   EXPECT_EQ("foo", str);

   str = "\t  \n\f\r\n\vfoo";
   absl::StripLeadingAsciiWhitespace(&str);
   EXPECT_EQ("foo", str);

   str = "\t  \n\f\r\n\vfoo foo\n ";
   absl::StripLeadingAsciiWhitespace(&str);
   EXPECT_EQ("foo foo\n ", str);

   str = "\t  \n\f\r\v\n\t  \n\f\r\v\n";
   absl::StripLeadingAsciiWhitespace(&str);
   EXPECT_EQ(absl::string_view{}, str);
 }

 TEST(StripTrailingAsciiWhitespace, FromStringView) {
   EXPECT_EQ(absl::string_view{},
             absl::StripTrailingAsciiWhitespace(absl::string_view{}));
   EXPECT_EQ("foo", absl::StripTrailingAsciiWhitespace({"foo"}));
   EXPECT_EQ("foo", absl::StripTrailingAsciiWhitespace({"foo\t  \n\f\r\n\v"}));
   EXPECT_EQ(" \nfoo foo",
             absl::StripTrailingAsciiWhitespace({" \nfoo foo\t  \n\f\r\n\v"}));
   EXPECT_EQ(absl::string_view{}, absl::StripTrailingAsciiWhitespace(
                                      {"\t  \n\f\r\v\n\t  \n\f\r\v\n"}));
 }

 TEST(StripTrailingAsciiWhitespace, InPlace) {
   std::string str;

   absl::StripTrailingAsciiWhitespace(&str);
   EXPECT_EQ("", str);

   str = "foo";
   absl::StripTrailingAsciiWhitespace(&str);
   EXPECT_EQ("foo", str);

   str = "foo\t  \n\f\r\n\v";
   absl::StripTrailingAsciiWhitespace(&str);
   EXPECT_EQ("foo", str);

   str = " \nfoo foo\t  \n\f\r\n\v";
   absl::StripTrailingAsciiWhitespace(&str);
   EXPECT_EQ(" \nfoo foo", str);

   str = "\t  \n\f\r\v\n\t  \n\f\r\v\n";
   absl::StripTrailingAsciiWhitespace(&str);
   EXPECT_EQ(absl::string_view{}, str);
 }

 TEST(StripAsciiWhitespace, FromStringView) {
   EXPECT_EQ(absl::string_view{},
             absl::StripAsciiWhitespace(absl::string_view{}));
   EXPECT_EQ("foo", absl::StripAsciiWhitespace({"foo"}));
   EXPECT_EQ("foo",
             absl::StripAsciiWhitespace({"\t  \n\f\r\n\vfoo\t  \n\f\r\n\v"}));
   EXPECT_EQ("foo foo", absl::StripAsciiWhitespace(
                            {"\t  \n\f\r\n\vfoo foo\t  \n\f\r\n\v"}));
   EXPECT_EQ(absl::string_view{},
             absl::StripAsciiWhitespace({"\t  \n\f\r\v\n\t  \n\f\r\v\n"}));
 }

 TEST(StripAsciiWhitespace, InPlace) {
   std::string str;

   absl::StripAsciiWhitespace(&str);
   EXPECT_EQ("", str);

   str = "foo";
   absl::StripAsciiWhitespace(&str);
   EXPECT_EQ("foo", str);

   str = "\t  \n\f\r\n\vfoo\t  \n\f\r\n\v";
   absl::StripAsciiWhitespace(&str);
   EXPECT_EQ("foo", str);

   str = "\t  \n\f\r\n\vfoo foo\t  \n\f\r\n\v";
   absl::StripAsciiWhitespace(&str);
   EXPECT_EQ("foo foo", str);

   str = "\t  \n\f\r\v\n\t  \n\f\r\v\n";
   absl::StripAsciiWhitespace(&str);
   EXPECT_EQ(absl::string_view{}, str);
 }

 TEST(RemoveExtraAsciiWhitespace, InPlace) {
   const char* inputs[] = {"No extra space",
                           "  Leading whitespace",
                           "Trailing whitespace  ",
                           "  Leading and trailing  ",
                           " Whitespace \t  in\v   middle  ",
                           "'Eeeeep!  \n Newlines!\n",
                           "nospaces",
                           "",
                           "\n\t a\t\n\nb \t\n"};

   const char* outputs[] = {
       "No extra space",
       "Leading whitespace",
       "Trailing whitespace",
       "Leading and trailing",
       "Whitespace in middle",
       "'Eeeeep! Newlines!",
       "nospaces",
       "",
       "a\nb",
   };
   const int NUM_TESTS = ABSL_ARRAYSIZE(inputs);

   for (int i = 0; i < NUM_TESTS; i++) {
     std::string s(inputs[i]);
     absl::RemoveExtraAsciiWhitespace(&s);
     EXPECT_EQ(outputs[i], s);
   }
 }

 }  // namespace
	// Copyright 2017 The Abseil Authors.
	//
	// 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
	//
	// https://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 "absl/strings/ascii.h"

	#include <algorithm>
	#include <cctype>
	#include <clocale>
	#include <cstring>
	#include <string>

	#include "gtest/gtest.h"
	#include "absl/base/macros.h"
	#include "absl/strings/string_view.h"

	namespace {

	TEST(AsciiIsFoo, All) {
	for (int i = 0; i < 256; i++) {
	const auto c = static_cast<unsigned char>(i);
	if ((c >= 'a' && c <= 'z') \|\| (c >= 'A' && c <= 'Z'))
	EXPECT_TRUE(absl::ascii_isalpha(c)) << ": failed on " << c;
	else
	EXPECT_TRUE(!absl::ascii_isalpha(c)) << ": failed on " << c;
	}
	for (int i = 0; i < 256; i++) {
	const auto c = static_cast<unsigned char>(i);
	if ((c >= '0' && c <= '9'))
	EXPECT_TRUE(absl::ascii_isdigit(c)) << ": failed on " << c;
	else
	EXPECT_TRUE(!absl::ascii_isdigit(c)) << ": failed on " << c;
	}
	for (int i = 0; i < 256; i++) {
	const auto c = static_cast<unsigned char>(i);
	if (absl::ascii_isalpha(c) \|\| absl::ascii_isdigit(c))
	EXPECT_TRUE(absl::ascii_isalnum(c)) << ": failed on " << c;
	else
	EXPECT_TRUE(!absl::ascii_isalnum(c)) << ": failed on " << c;
	}
	for (int i = 0; i < 256; i++) {
	const auto c = static_cast<unsigned char>(i);
	if (i != '\0' && strchr(" \r\n\t\v\f", i))
	EXPECT_TRUE(absl::ascii_isspace(c)) << ": failed on " << c;
	else
	EXPECT_TRUE(!absl::ascii_isspace(c)) << ": failed on " << c;
	}
	for (int i = 0; i < 256; i++) {
	const auto c = static_cast<unsigned char>(i);
	if (i >= 32 && i < 127)
	EXPECT_TRUE(absl::ascii_isprint(c)) << ": failed on " << c;
	else
	EXPECT_TRUE(!absl::ascii_isprint(c)) << ": failed on " << c;
	}
	for (int i = 0; i < 256; i++) {
	const auto c = static_cast<unsigned char>(i);
	if (absl::ascii_isprint(c) && !absl::ascii_isspace(c) &&
	!absl::ascii_isalnum(c)) {
	EXPECT_TRUE(absl::ascii_ispunct(c)) << ": failed on " << c;
	} else {
	EXPECT_TRUE(!absl::ascii_ispunct(c)) << ": failed on " << c;
	}
	}
	for (int i = 0; i < 256; i++) {
	const auto c = static_cast<unsigned char>(i);
	if (i == ' ' \|\| i == '\t')
	EXPECT_TRUE(absl::ascii_isblank(c)) << ": failed on " << c;
	else
	EXPECT_TRUE(!absl::ascii_isblank(c)) << ": failed on " << c;
	}
	for (int i = 0; i < 256; i++) {
	const auto c = static_cast<unsigned char>(i);
	if (i < 32 \|\| i == 127)
	EXPECT_TRUE(absl::ascii_iscntrl(c)) << ": failed on " << c;
	else
	EXPECT_TRUE(!absl::ascii_iscntrl(c)) << ": failed on " << c;
	}
	for (int i = 0; i < 256; i++) {
	const auto c = static_cast<unsigned char>(i);
	if (absl::ascii_isdigit(c) \|\| (i >= 'A' && i <= 'F') \|\|
	(i >= 'a' && i <= 'f')) {
	EXPECT_TRUE(absl::ascii_isxdigit(c)) << ": failed on " << c;
	} else {
	EXPECT_TRUE(!absl::ascii_isxdigit(c)) << ": failed on " << c;
	}
	}
	for (int i = 0; i < 256; i++) {
	const auto c = static_cast<unsigned char>(i);
	if (i > 32 && i < 127)
	EXPECT_TRUE(absl::ascii_isgraph(c)) << ": failed on " << c;
	else
	EXPECT_TRUE(!absl::ascii_isgraph(c)) << ": failed on " << c;
	}
	for (int i = 0; i < 256; i++) {
	const auto c = static_cast<unsigned char>(i);
	if (i >= 'A' && i <= 'Z')
	EXPECT_TRUE(absl::ascii_isupper(c)) << ": failed on " << c;
	else
	EXPECT_TRUE(!absl::ascii_isupper(c)) << ": failed on " << c;
	}
	for (int i = 0; i < 256; i++) {
	const auto c = static_cast<unsigned char>(i);
	if (i >= 'a' && i <= 'z')
	EXPECT_TRUE(absl::ascii_islower(c)) << ": failed on " << c;
	else
	EXPECT_TRUE(!absl::ascii_islower(c)) << ": failed on " << c;
	}
	for (unsigned char c = 0; c < 128; c++) {
	EXPECT_TRUE(absl::ascii_isascii(c)) << ": failed on " << c;
	}
	for (int i = 128; i < 256; i++) {
	const auto c = static_cast<unsigned char>(i);
	EXPECT_TRUE(!absl::ascii_isascii(c)) << ": failed on " << c;
	}
	}

	// Checks that absl::ascii_isfoo returns the same value as isfoo in the C
	// locale.
	TEST(AsciiIsFoo, SameAsIsFoo) {
	#ifndef __ANDROID__
	// temporarily change locale to C. It should already be C, but just for safety
	const char* old_locale = setlocale(LC_CTYPE, "C");
	ASSERT_TRUE(old_locale != nullptr);
	#endif

	for (int i = 0; i < 256; i++) {
	const auto c = static_cast<unsigned char>(i);
	EXPECT_EQ(isalpha(c) != 0, absl::ascii_isalpha(c)) << c;
	EXPECT_EQ(isdigit(c) != 0, absl::ascii_isdigit(c)) << c;
	EXPECT_EQ(isalnum(c) != 0, absl::ascii_isalnum(c)) << c;
	EXPECT_EQ(isspace(c) != 0, absl::ascii_isspace(c)) << c;
	EXPECT_EQ(ispunct(c) != 0, absl::ascii_ispunct(c)) << c;
	EXPECT_EQ(isblank(c) != 0, absl::ascii_isblank(c)) << c;
	EXPECT_EQ(iscntrl(c) != 0, absl::ascii_iscntrl(c)) << c;
	EXPECT_EQ(isxdigit(c) != 0, absl::ascii_isxdigit(c)) << c;
	EXPECT_EQ(isprint(c) != 0, absl::ascii_isprint(c)) << c;
	EXPECT_EQ(isgraph(c) != 0, absl::ascii_isgraph(c)) << c;
	EXPECT_EQ(isupper(c) != 0, absl::ascii_isupper(c)) << c;
	EXPECT_EQ(islower(c) != 0, absl::ascii_islower(c)) << c;
	EXPECT_EQ(isascii(c) != 0, absl::ascii_isascii(c)) << c;
	}

	#ifndef __ANDROID__
	// restore the old locale.
	ASSERT_TRUE(setlocale(LC_CTYPE, old_locale));
	#endif
	}

	TEST(AsciiToFoo, All) {
	#ifndef __ANDROID__
	// temporarily change locale to C. It should already be C, but just for safety
	const char* old_locale = setlocale(LC_CTYPE, "C");
	ASSERT_TRUE(old_locale != nullptr);
	#endif

	for (int i = 0; i < 256; i++) {
	const auto c = static_cast<unsigned char>(i);
	if (absl::ascii_islower(c))
	EXPECT_EQ(absl::ascii_toupper(c), 'A' + (i - 'a')) << c;
	else
	EXPECT_EQ(absl::ascii_toupper(c), static_cast<char>(i)) << c;

	if (absl::ascii_isupper(c))
	EXPECT_EQ(absl::ascii_tolower(c), 'a' + (i - 'A')) << c;
	else
	EXPECT_EQ(absl::ascii_tolower(c), static_cast<char>(i)) << c;

	// These CHECKs only hold in a C locale.
	EXPECT_EQ(static_cast<char>(tolower(i)), absl::ascii_tolower(c)) << c;
	EXPECT_EQ(static_cast<char>(toupper(i)), absl::ascii_toupper(c)) << c;
	}
	#ifndef __ANDROID__
	// restore the old locale.
	ASSERT_TRUE(setlocale(LC_CTYPE, old_locale));
	#endif
	}

	TEST(AsciiStrTo, Lower) {
	const char buf[] = "ABCDEF";
	const std::string str("GHIJKL");
	const std::string str2("MNOPQR");
	const absl::string_view sp(str2);
	std::string mutable_str("_`?@[{AMNOPQRSTUVWXYZ");

	EXPECT_EQ("abcdef", absl::AsciiStrToLower(buf));
	EXPECT_EQ("ghijkl", absl::AsciiStrToLower(str));
	EXPECT_EQ("mnopqr", absl::AsciiStrToLower(sp));

	absl::AsciiStrToLower(&mutable_str);
	EXPECT_EQ("_`?@[{amnopqrstuvwxyz", mutable_str);

	char mutable_buf[] = "Mutable";
	std::transform(mutable_buf, mutable_buf + strlen(mutable_buf),
	mutable_buf, absl::ascii_tolower);
	EXPECT_STREQ("mutable", mutable_buf);
	}

	TEST(AsciiStrTo, Upper) {
	const char buf[] = "abcdef";
	const std::string str("ghijkl");
	const std::string str2("_`?@[{amnopqrstuvwxyz");
	const absl::string_view sp(str2);

	EXPECT_EQ("ABCDEF", absl::AsciiStrToUpper(buf));
	EXPECT_EQ("GHIJKL", absl::AsciiStrToUpper(str));
	EXPECT_EQ("_`?@[{AMNOPQRSTUVWXYZ", absl::AsciiStrToUpper(sp));

	char mutable_buf[] = "Mutable";
	std::transform(mutable_buf, mutable_buf + strlen(mutable_buf),
	mutable_buf, absl::ascii_toupper);
	EXPECT_STREQ("MUTABLE", mutable_buf);
	}

	TEST(StripLeadingAsciiWhitespace, FromStringView) {
	EXPECT_EQ(absl::string_view{},
	absl::StripLeadingAsciiWhitespace(absl::string_view{}));
	EXPECT_EQ("foo", absl::StripLeadingAsciiWhitespace({"foo"}));
	EXPECT_EQ("foo", absl::StripLeadingAsciiWhitespace({"\t \n\f\r\n\vfoo"}));
	EXPECT_EQ("foo foo\n ",
	absl::StripLeadingAsciiWhitespace({"\t \n\f\r\n\vfoo foo\n "}));
	EXPECT_EQ(absl::string_view{}, absl::StripLeadingAsciiWhitespace(
	{"\t \n\f\r\v\n\t \n\f\r\v\n"}));
	}

	TEST(StripLeadingAsciiWhitespace, InPlace) {
	std::string str;

	absl::StripLeadingAsciiWhitespace(&str);
	EXPECT_EQ("", str);

	str = "foo";
	absl::StripLeadingAsciiWhitespace(&str);
	EXPECT_EQ("foo", str);

	str = "\t \n\f\r\n\vfoo";
	absl::StripLeadingAsciiWhitespace(&str);
	EXPECT_EQ("foo", str);

	str = "\t \n\f\r\n\vfoo foo\n ";
	absl::StripLeadingAsciiWhitespace(&str);
	EXPECT_EQ("foo foo\n ", str);

	str = "\t \n\f\r\v\n\t \n\f\r\v\n";
	absl::StripLeadingAsciiWhitespace(&str);
	EXPECT_EQ(absl::string_view{}, str);
	}

	TEST(StripTrailingAsciiWhitespace, FromStringView) {
	EXPECT_EQ(absl::string_view{},
	absl::StripTrailingAsciiWhitespace(absl::string_view{}));
	EXPECT_EQ("foo", absl::StripTrailingAsciiWhitespace({"foo"}));
	EXPECT_EQ("foo", absl::StripTrailingAsciiWhitespace({"foo\t \n\f\r\n\v"}));
	EXPECT_EQ(" \nfoo foo",
	absl::StripTrailingAsciiWhitespace({" \nfoo foo\t \n\f\r\n\v"}));
	EXPECT_EQ(absl::string_view{}, absl::StripTrailingAsciiWhitespace(
	{"\t \n\f\r\v\n\t \n\f\r\v\n"}));
	}

	TEST(StripTrailingAsciiWhitespace, InPlace) {
	std::string str;

	absl::StripTrailingAsciiWhitespace(&str);
	EXPECT_EQ("", str);

	str = "foo";
	absl::StripTrailingAsciiWhitespace(&str);
	EXPECT_EQ("foo", str);

	str = "foo\t \n\f\r\n\v";
	absl::StripTrailingAsciiWhitespace(&str);
	EXPECT_EQ("foo", str);

	str = " \nfoo foo\t \n\f\r\n\v";
	absl::StripTrailingAsciiWhitespace(&str);
	EXPECT_EQ(" \nfoo foo", str);

	str = "\t \n\f\r\v\n\t \n\f\r\v\n";
	absl::StripTrailingAsciiWhitespace(&str);
	EXPECT_EQ(absl::string_view{}, str);
	}

	TEST(StripAsciiWhitespace, FromStringView) {
	EXPECT_EQ(absl::string_view{},
	absl::StripAsciiWhitespace(absl::string_view{}));
	EXPECT_EQ("foo", absl::StripAsciiWhitespace({"foo"}));
	EXPECT_EQ("foo",
	absl::StripAsciiWhitespace({"\t \n\f\r\n\vfoo\t \n\f\r\n\v"}));
	EXPECT_EQ("foo foo", absl::StripAsciiWhitespace(
	{"\t \n\f\r\n\vfoo foo\t \n\f\r\n\v"}));
	EXPECT_EQ(absl::string_view{},
	absl::StripAsciiWhitespace({"\t \n\f\r\v\n\t \n\f\r\v\n"}));
	}

	TEST(StripAsciiWhitespace, InPlace) {
	std::string str;

	absl::StripAsciiWhitespace(&str);
	EXPECT_EQ("", str);

	str = "foo";
	absl::StripAsciiWhitespace(&str);
	EXPECT_EQ("foo", str);

	str = "\t \n\f\r\n\vfoo\t \n\f\r\n\v";
	absl::StripAsciiWhitespace(&str);
	EXPECT_EQ("foo", str);

	str = "\t \n\f\r\n\vfoo foo\t \n\f\r\n\v";
	absl::StripAsciiWhitespace(&str);
	EXPECT_EQ("foo foo", str);

	str = "\t \n\f\r\v\n\t \n\f\r\v\n";
	absl::StripAsciiWhitespace(&str);
	EXPECT_EQ(absl::string_view{}, str);
	}

	TEST(RemoveExtraAsciiWhitespace, InPlace) {
	const char* inputs[] = {"No extra space",
	" Leading whitespace",
	"Trailing whitespace ",
	" Leading and trailing ",
	" Whitespace \t in\v middle ",
	"'Eeeeep! \n Newlines!\n",
	"nospaces",
	"",
	"\n\t a\t\n\nb \t\n"};

	const char* outputs[] = {
	"No extra space",
	"Leading whitespace",
	"Trailing whitespace",
	"Leading and trailing",
	"Whitespace in middle",
	"'Eeeeep! Newlines!",
	"nospaces",
	"",
	"a\nb",
	};
	const int NUM_TESTS = ABSL_ARRAYSIZE(inputs);

	for (int i = 0; i < NUM_TESTS; i++) {
	std::string s(inputs[i]);
	absl::RemoveExtraAsciiWhitespace(&s);
	EXPECT_EQ(outputs[i], s);
	}
	}

	} // namespace