unittests/Support/UnicodeTest.cpp - llvm-project/llvm - Git at Google

 //===- unittests/Support/UnicodeTest.cpp - Unicode.h tests ----------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//

 #include "llvm/Support/Unicode.h"
 #include "llvm/ADT/StringExtras.h"
 #include "llvm/ADT/edit_distance.h"
 #include "llvm/Support/ConvertUTF.h"
 #include "gmock/gmock.h"
 #include "gtest/gtest.h"

 namespace llvm {
 namespace sys {
 namespace unicode {
 namespace {

 TEST(Unicode, columnWidthUTF8) {
   EXPECT_EQ(0, columnWidthUTF8(""));
   EXPECT_EQ(1, columnWidthUTF8(" "));
   EXPECT_EQ(1, columnWidthUTF8("a"));
   EXPECT_EQ(1, columnWidthUTF8("~"));

   EXPECT_EQ(6, columnWidthUTF8("abcdef"));

   EXPECT_EQ(-1, columnWidthUTF8("\x01"));
   EXPECT_EQ(-1, columnWidthUTF8("\t"));
   EXPECT_EQ(-1, columnWidthUTF8("aaaaaaaaaa\x01"));
   EXPECT_EQ(-1, columnWidthUTF8("\342\200\213")); // 200B ZERO WIDTH SPACE

   // 00AD SOFT HYPHEN is displayed on most terminals as a space or a dash. Some
   // text editors display it only when a line is broken at it, some use it as a
   // line-break hint, but don't display. We choose terminal-oriented
   // interpretation.
   EXPECT_EQ(1, columnWidthUTF8("\302\255"));

   EXPECT_EQ(0, columnWidthUTF8("\314\200"));     // 0300 COMBINING GRAVE ACCENT
   EXPECT_EQ(1, columnWidthUTF8("\340\270\201")); // 0E01 THAI CHARACTER KO KAI
   EXPECT_EQ(2, columnWidthUTF8("\344\270\200")); // CJK UNIFIED IDEOGRAPH-4E00

   EXPECT_EQ(4, columnWidthUTF8("\344\270\200\344\270\200"));
   EXPECT_EQ(3, columnWidthUTF8("q\344\270\200"));
   EXPECT_EQ(3, columnWidthUTF8("\314\200\340\270\201\344\270\200"));

   EXPECT_EQ(2, columnWidthUTF8("\342\214\232")); // U+231A WATCH (emoji)
   EXPECT_EQ(2, columnWidthUTF8("\360\237\253\233")); // U+1FADB PEA POD (Unicode 15 emoji)
   EXPECT_EQ(2, columnWidthUTF8("\360\233\204\262")); // U+1B132 HIRAGANA LETTER SMALL KO
   EXPECT_EQ(2, columnWidthUTF8("\360\227\201\202")); // U+17042 TANGUT IDEOGRAPH

   // Invalid UTF-8 strings, columnWidthUTF8 should error out.
   EXPECT_EQ(-2, columnWidthUTF8("\344"));
   EXPECT_EQ(-2, columnWidthUTF8("\344\270"));
   EXPECT_EQ(-2, columnWidthUTF8("\344\270\033"));
   EXPECT_EQ(-2, columnWidthUTF8("\344\270\300"));
   EXPECT_EQ(-2, columnWidthUTF8("\377\366\355"));

   EXPECT_EQ(-2, columnWidthUTF8("qwer\344"));
   EXPECT_EQ(-2, columnWidthUTF8("qwer\344\270"));
   EXPECT_EQ(-2, columnWidthUTF8("qwer\344\270\033"));
   EXPECT_EQ(-2, columnWidthUTF8("qwer\344\270\300"));
   EXPECT_EQ(-2, columnWidthUTF8("qwer\377\366\355"));

   // UTF-8 sequences longer than 4 bytes correspond to unallocated Unicode
   // characters.
   EXPECT_EQ(-2, columnWidthUTF8("\370\200\200\200\200"));     // U+200000
   EXPECT_EQ(-2, columnWidthUTF8("\374\200\200\200\200\200")); // U+4000000
 }

 TEST(Unicode, isPrintable) {
   EXPECT_FALSE(isPrintable(0)); // <control-0000>-<control-001F>
   EXPECT_FALSE(isPrintable(0x01));
   EXPECT_FALSE(isPrintable(0x1F));
   EXPECT_TRUE(isPrintable(' '));
   EXPECT_TRUE(isPrintable('A'));
   EXPECT_TRUE(isPrintable('~'));
   EXPECT_FALSE(isPrintable(0x7F)); // <control-007F>..<control-009F>
   EXPECT_FALSE(isPrintable(0x90));
   EXPECT_FALSE(isPrintable(0x9F));

   EXPECT_TRUE(isPrintable(0xAC));
   EXPECT_TRUE(isPrintable(0xAD)); // SOFT HYPHEN is displayed on most terminals
                                   // as either a space or a dash.
   EXPECT_TRUE(isPrintable(0xAE));

   EXPECT_TRUE(isPrintable(0x0377));  // GREEK SMALL LETTER PAMPHYLIAN DIGAMMA
   EXPECT_FALSE(isPrintable(0x0378)); // <reserved-0378>..<reserved-0379>

   EXPECT_FALSE(isPrintable(0x0600)); // ARABIC NUMBER SIGN

   EXPECT_FALSE(isPrintable(0x1FFFF)); // <reserved-1F774>..<noncharacter-1FFFF>
   EXPECT_TRUE(isPrintable(0x20000));  // CJK UNIFIED IDEOGRAPH-20000

   EXPECT_FALSE(isPrintable(0x10FFFF)); // noncharacter

   // test the validity of a fast path in columnWidthUTF8
   for (unsigned char c = 0; c < 128; ++c) {
     const UTF8 buf8[2] = {c, 0};
     const UTF8 *Target8 = &buf8[0];
     UTF32 buf32[1];
     UTF32 *Target32 = &buf32[0];
     auto status = ConvertUTF8toUTF32(&Target8, Target8 + 1, &Target32,
                                      Target32 + 1, strictConversion);
     EXPECT_EQ(status, conversionOK);
     EXPECT_EQ((columnWidthUTF8(reinterpret_cast<const char *>(buf8)) == 1),
               (bool)isPrintable(buf32[0]));
   }
 }

 TEST(Unicode, nameToCodepointStrict) {
   auto map = [](StringRef Str) {
     return nameToCodepointStrict(Str).value_or(0xFFFF'FFFF);
   };

   // generated codepoints
   EXPECT_EQ(0x03400u, map("CJK UNIFIED IDEOGRAPH-3400"));
   EXPECT_EQ(0x04DBFu, map("CJK UNIFIED IDEOGRAPH-4DBF"));
   EXPECT_EQ(0x04E00u, map("CJK UNIFIED IDEOGRAPH-4E00"));
   EXPECT_EQ(0x09FFCu, map("CJK UNIFIED IDEOGRAPH-9FFC"));
   EXPECT_EQ(0x20000u, map("CJK UNIFIED IDEOGRAPH-20000"));
   EXPECT_EQ(0x2A6DDu, map("CJK UNIFIED IDEOGRAPH-2A6DD"));
   EXPECT_EQ(0x2A700u, map("CJK UNIFIED IDEOGRAPH-2A700"));
   EXPECT_EQ(0x2B740u, map("CJK UNIFIED IDEOGRAPH-2B740"));
   EXPECT_EQ(0x2B81Du, map("CJK UNIFIED IDEOGRAPH-2B81D"));
   EXPECT_EQ(0x2B820u, map("CJK UNIFIED IDEOGRAPH-2B820"));
   EXPECT_EQ(0x2CEA1u, map("CJK UNIFIED IDEOGRAPH-2CEA1"));
   EXPECT_EQ(0x2CEB0u, map("CJK UNIFIED IDEOGRAPH-2CEB0"));
   EXPECT_EQ(0x2EBE0u, map("CJK UNIFIED IDEOGRAPH-2EBE0"));
   EXPECT_EQ(0x30000u, map("CJK UNIFIED IDEOGRAPH-30000"));
   EXPECT_EQ(0x3134Au, map("CJK UNIFIED IDEOGRAPH-3134A"));
   EXPECT_EQ(0x17000u, map("TANGUT IDEOGRAPH-17000"));
   EXPECT_EQ(0x187F7u, map("TANGUT IDEOGRAPH-187F7"));
   EXPECT_EQ(0x18D00u, map("TANGUT IDEOGRAPH-18D00"));
   EXPECT_EQ(0x18D08u, map("TANGUT IDEOGRAPH-18D08"));
   EXPECT_EQ(0x18B00u, map("KHITAN SMALL SCRIPT CHARACTER-18B00"));
   EXPECT_EQ(0x18CD5u, map("KHITAN SMALL SCRIPT CHARACTER-18CD5"));
   EXPECT_EQ(0x1B170u, map("NUSHU CHARACTER-1B170"));
   EXPECT_EQ(0x1B2FBu, map("NUSHU CHARACTER-1B2FB"));
   EXPECT_EQ(0x0F900u, map("CJK COMPATIBILITY IDEOGRAPH-F900"));
   EXPECT_EQ(0x0FA6Du, map("CJK COMPATIBILITY IDEOGRAPH-FA6D"));
   EXPECT_EQ(0x0FA70u, map("CJK COMPATIBILITY IDEOGRAPH-FA70"));
   EXPECT_EQ(0x0FAD9u, map("CJK COMPATIBILITY IDEOGRAPH-FAD9"));
   EXPECT_EQ(0x2F800u, map("CJK COMPATIBILITY IDEOGRAPH-2F800"));
   EXPECT_EQ(0x2FA1Du, map("CJK COMPATIBILITY IDEOGRAPH-2FA1D"));
   EXPECT_EQ(0x31350u, map("CJK UNIFIED IDEOGRAPH-31350")); // Unicode 15.0

   EXPECT_EQ(0xAC00u, map("HANGUL SYLLABLE GA"));
   EXPECT_EQ(0xAC14u, map("HANGUL SYLLABLE GASS"));
   EXPECT_EQ(0xAC2Bu, map("HANGUL SYLLABLE GAELH"));
   EXPECT_EQ(0xAC7Bu, map("HANGUL SYLLABLE GEOLB"));
   EXPECT_EQ(0xC640u, map("HANGUL SYLLABLE WA"));
   EXPECT_EQ(0xC544u, map("HANGUL SYLLABLE A"));
   EXPECT_EQ(0xC5D0u, map("HANGUL SYLLABLE E"));
   EXPECT_EQ(0xC774u, map("HANGUL SYLLABLE I"));

   EXPECT_EQ(0x1F984u, map("UNICORN FACE"));
   EXPECT_EQ(0x00640u, map("ARABIC TATWEEL"));
   EXPECT_EQ(0x02C05u, map("GLAGOLITIC CAPITAL LETTER YESTU"));
   EXPECT_EQ(0x13000u, map("EGYPTIAN HIEROGLYPH A001"));
   EXPECT_EQ(0x02235u, map("BECAUSE"));
   EXPECT_EQ(0x1F514u, map("BELL"));
   EXPECT_EQ(0x1F9A9u, map("FLAMINGO"));
   EXPECT_EQ(0x1F9A9u, map("FLAMINGO"));
   EXPECT_EQ(0x1F402u, map("OX")); // 2 characters
   EXPECT_EQ(0x0FBF9u, map("ARABIC LIGATURE UIGHUR KIRGHIZ YEH WITH HAMZA "
                           "ABOVE WITH ALEF MAKSURA ISOLATED FORM"));
   EXPECT_EQ(0x11F04u, map("KAWI LETTER A")); // Unicode 15.0
   EXPECT_EQ(0x1FA77u, map("PINK HEART")); // Unicode 15.0

   // Aliases
   EXPECT_EQ(0x0000u, map("NULL"));
   EXPECT_EQ(0x0007u, map("ALERT"));
   EXPECT_EQ(0x0009u, map("HORIZONTAL TABULATION"));
   EXPECT_EQ(0x0009u, map("CHARACTER TABULATION"));
   EXPECT_EQ(0x000Au, map("LINE FEED"));
   EXPECT_EQ(0x000Au, map("NEW LINE"));
   EXPECT_EQ(0x0089u, map("CHARACTER TABULATION WITH JUSTIFICATION"));
   EXPECT_EQ(0x0089u, map("HORIZONTAL TABULATION WITH JUSTIFICATION"));
   EXPECT_EQ(0x2118u,
             map("WEIERSTRASS ELLIPTIC FUNCTION"));      // correction
   EXPECT_EQ(0x2118u, map("SCRIPT CAPITAL P"));          // correction
   EXPECT_EQ(0xFEFFu, map("BYTE ORDER MARK"));           // alternate
   EXPECT_EQ(0xFEFFu, map("ZERO WIDTH NO-BREAK SPACE")); // alternate

   // Should perform exact case match
   EXPECT_EQ(0xFFFFFFFFu, map(""));
   EXPECT_EQ(0xFFFFFFFFu, map("NOT A UNICODE CHARACTER"));
   EXPECT_EQ(0xFFFFFFFFu, map("unicorn face"));
   EXPECT_EQ(0xFFFFFFFFu, map("UNICORN FaCE"));
   EXPECT_EQ(0xFFFFFFFFu, map("UNICORNFaCE"));
   EXPECT_EQ(0xFFFFFFFFu, map("UNICORN"));
   EXPECT_EQ(0xFFFFFFFFu, map("HANGUL SYLLABLE i"));
   EXPECT_EQ(0xFFFFFFFFu, map("hANGUL SYLLABLE i"));
   EXPECT_EQ(0xFFFFFFFFu, map("HANGULSYLLABLEI"));
   EXPECT_EQ(0xFFFFFFFFu, map("HANGUL SYLLABLE"));
   EXPECT_EQ(0xFFFFFFFFu, map("cJK COMPATIBILITY IDEOGRAPH-2FA1D"));
   EXPECT_EQ(0xFFFFFFFFu, map("CJK COMPATIBILITY IDEOGRAPH-2FA1d"));
   EXPECT_EQ(0xFFFFFFFFu, map("CJK COMPATIBILITY IDEOGRAPH 2FA1D"));
   EXPECT_EQ(0xFFFFFFFF, map("CJK COMPATIBILITY IDEOGRAPH-NOTANUMBER"));
   EXPECT_EQ(0xFFFFFFFFu, map("CJK COMPATIBILITY IDEOGRAPH-1"));
   EXPECT_EQ(0xFFFFFFFFu, map("ZERO WIDTH NO BREAK SPACE"));

   // Should not support abbreviations or figments
   EXPECT_EQ(0xFFFFFFFFu, map("FVS1"));
   EXPECT_EQ(0xFFFFFFFFu, map("HIGH OCTET PRESET"));
   EXPECT_EQ(0xFFFFFFFFu, map("BEL"));
 }

 TEST(Unicode, nameToCodepointLoose) {
   auto map = [](StringRef Str) {
     auto Opt = nameToCodepointLooseMatching(Str);
     if (!Opt)
       return char32_t(0xFFFF'FFFF);
     return Opt->CodePoint;
   };

   // generated codepoints
   EXPECT_EQ(0x04DBFu, map("CJK UNIFIED IDEOGRAPH-4DBF"));
   EXPECT_EQ(0x04E00u, map("CJK UNIFIED IDEOGRAPH-4E00"));
   EXPECT_EQ(0x09FFCu, map("CJK UNIFIED IDEOGRAPH-9FFC"));
   EXPECT_EQ(0x20000u, map("CJK UNIFIED IDEOGRAPH-20000"));
   EXPECT_EQ(0x2A6DDu, map("CJK UNIFIED IDEOGRAPH-2A6DD"));
   EXPECT_EQ(0x2A700u, map("CJK UNIFIED IDEOGRAPH-2A700"));
   EXPECT_EQ(0x2B740u, map("CJK UNIFIED IDEOGRAPH-2B740"));
   EXPECT_EQ(0x03400u, map("CJK UNIFIED IDEOGRAPH-3400"));
   EXPECT_EQ(0x2B81Du, map("CJK UNIFIED IDEOGRAPH-2B81D"));
   EXPECT_EQ(0x2B820u, map("CJK UNIFIED IDEOGRAPH-2B820"));
   EXPECT_EQ(0x2CEA1u, map("CJK UNIFIED IDEOGRAPH-2CEA1"));
   EXPECT_EQ(0x2CEB0u, map("CJK UNIFIED IDEOGRAPH-2CEB0"));
   EXPECT_EQ(0x2EBE0u, map("CJK UNIFIED IDEOGRAPH-2EBE0"));
   EXPECT_EQ(0x30000u, map("CJK UNIFIED IDEOGRAPH-30000"));
   EXPECT_EQ(0x3134Au, map("CJK UNIFIED IDEOGRAPH-3134A"));
   EXPECT_EQ(0x17000u, map("TANGUT IDEOGRAPH-17000"));
   EXPECT_EQ(0x187F7u, map("TANGUT IDEOGRAPH-187F7"));
   EXPECT_EQ(0x18D00u, map("TANGUT IDEOGRAPH-18D00"));
   EXPECT_EQ(0x18D08u, map("TANGUT IDEOGRAPH-18D08"));
   EXPECT_EQ(0x18B00u, map("KHITAN SMALL SCRIPT CHARACTER-18B00"));
   EXPECT_EQ(0x18CD5u, map("KHITAN SMALL SCRIPT CHARACTER-18CD5"));
   EXPECT_EQ(0x1B170u, map("NUSHU CHARACTER-1B170"));
   EXPECT_EQ(0x1B2FBu, map("NUSHU CHARACTER-1B2FB"));
   EXPECT_EQ(0x0F900u, map("CJK COMPATIBILITY IDEOGRAPH-F900"));
   EXPECT_EQ(0x0FA6Du, map("CJK COMPATIBILITY IDEOGRAPH-FA6D"));
   EXPECT_EQ(0x0FA70u, map("CJK COMPATIBILITY IDEOGRAPH-FA70"));
   EXPECT_EQ(0x0FAD9u, map("CJK COMPATIBILITY IDEOGRAPH-FAD9"));
   EXPECT_EQ(0x2F800u, map("CJK COMPATIBILITY IDEOGRAPH-2F800"));
   EXPECT_EQ(0x2FA1Du, map("CJK COMPATIBILITY IDEOGRAPH-2FA1D"));

   EXPECT_EQ(0xAC00u, map("HANGUL SYLLABLE GA"));
   EXPECT_EQ(0xAC14u, map("HANGUL SYLLABLE GASS"));
   EXPECT_EQ(0xAC2Bu, map("HANGUL SYLLABLE GAELH"));
   EXPECT_EQ(0xAC7Bu, map("HANGUL SYLLABLE GEOLB"));
   EXPECT_EQ(0xC640u, map("HANGUL SYLLABLE WA"));
   EXPECT_EQ(0xC544u, map("HANGUL SYLLABLE A"));
   EXPECT_EQ(0xC5D0u, map("HANGUL SYLLABLE E"));
   EXPECT_EQ(0xC774u, map("HANGUL SYLLABLE I"));

   EXPECT_EQ(0x1F984u, map("UNICORN FACE"));
   EXPECT_EQ(0x00640u, map("ARABIC TATWEEL"));
   EXPECT_EQ(0x02C05u, map("GLAGOLITIC CAPITAL LETTER YESTU"));
   EXPECT_EQ(0x13000u, map("EGYPTIAN HIEROGLYPH A001"));
   EXPECT_EQ(0x02235u, map("BECAUSE"));
   EXPECT_EQ(0x1F514u, map("BELL"));
   EXPECT_EQ(0x1F9A9u, map("FLAMINGO"));
   EXPECT_EQ(0x1F402u, map("OX")); // 2 characters
   EXPECT_EQ(0x0FBF9u, map("ARABIC LIGATURE UIGHUR KIRGHIZ YEH WITH HAMZA "
                           "ABOVE WITH ALEF MAKSURA ISOLATED FORM"));

   // Aliases
   EXPECT_EQ(0x0000u, map("NULL"));
   EXPECT_EQ(0x0007u, map("ALERT"));
   EXPECT_EQ(0x0009u, map("HORIZONTAL TABULATION"));
   EXPECT_EQ(0x0009u, map("CHARACTER TABULATION"));
   EXPECT_EQ(0x000Au, map("LINE FEED"));
   EXPECT_EQ(0x000Au, map("NEW LINE"));
   EXPECT_EQ(0x0089u, map("CHARACTER TABULATION WITH JUSTIFICATION"));
   EXPECT_EQ(0x0089u, map("HORIZONTAL TABULATION WITH JUSTIFICATION"));
   EXPECT_EQ(0x2118u,
             map("WEIERSTRASS ELLIPTIC FUNCTION"));      // correction
   EXPECT_EQ(0x2118u, map("SCRIPT CAPITAL P"));          // correction
   EXPECT_EQ(0xFEFFu, map("BYTE ORDER MARK"));           // alternate
   EXPECT_EQ(0xFEFFu, map("ZERO WIDTH NO-BREAK SPACE")); // alternate
   EXPECT_EQ(0xFEFFu, map("ZERO WIDTH NO BREAK SPACE")); // alternate

   // Should perform loose matching
   EXPECT_EQ(0xFFFFFFFFu, map(""));
   EXPECT_EQ(0xFFFFFFFFu, map("NOT A UNICODE CHARACTER"));
   EXPECT_EQ(0x0001F984u, map("unicorn face"));
   EXPECT_EQ(0x0001F984u, map("UNICORN FaCE"));
   EXPECT_EQ(0x0001F984u, map("UNICORNFaCE"));
   EXPECT_EQ(0xFFFFFFFFu, map("UNICORN"));
   EXPECT_EQ(0xC774u, map("HANGUL SYLLABLE i"));
   EXPECT_EQ(0xC774u, map("hANGUL SYLLABLE i"));
   EXPECT_EQ(0xC774u, map("HANGULSYLLABLEI"));
   EXPECT_EQ(0xFFFFFFFFu, map("HANGUL SYLLABLE"));

   EXPECT_EQ(0x2FA1Du, map("cJK COMPATIBILITY IDEOGRAPH-2FA1D"));
   EXPECT_EQ(0x2FA1Du, map("CJK COMPATIBILITY IDEOGRAPH-2FA1d"));
   EXPECT_EQ(0x2FA1Du, map("CJK COMPATIBILITY IDEOGRAPH 2FA1D"));

   EXPECT_EQ(0xFFFFFFFFu, map("CJK COMPATIBILITY IDEOGRAPH-NOTANUMBER"));
   EXPECT_EQ(0xFFFFFFFFu, map("CJK COMPATIBILITY IDEOGRAPH-1"));

   // https://unicode.org/reports/tr44/#Matching_Names
   // UAX44-LM2: Medial hypens are ignored, non medial hyphens are not
   EXPECT_EQ(0x1FBC5u, map("S-T-I-C-K-F-I-G-U-R-E"));
   EXPECT_EQ(0xFFFFFFFFu, map("-STICK FIGURE"));
   EXPECT_EQ(0xFFFFFFFFu, map("STICK FIGURE-"));
   EXPECT_EQ(0xFFFFFFFFu, map("STICK FIGURE -"));
   EXPECT_EQ(0xFFFFFFFFu, map("STICK FIGURE --"));
   EXPECT_EQ(0xFFFFFFFFu, map("STICK--FIGURE"));

   EXPECT_EQ(0x0F68u, map("TIBETAN LETTER A"));
   EXPECT_EQ(0x0F68u, map("TIBETAN LETTERA"));
   EXPECT_EQ(0x0F68u, map("TIBETAN LETTER-A"));
   EXPECT_EQ(0x0F60u, map("TIBETAN LETTER -A"));
   EXPECT_EQ(0x0F60u, map("TIBETAN LETTER  -A"));
   ;

   // special case
   EXPECT_EQ(0x1180u, map("HANGUL JUNGSEONG O-E"));
   EXPECT_EQ(0x116Cu, map("HANGUL JUNGSEONG OE"));

   // names that are prefix to existing characters should not match
   EXPECT_FALSE(nameToCodepointLooseMatching("B"));
   EXPECT_FALSE(nameToCodepointLooseMatching("BE"));
   EXPECT_FALSE(nameToCodepointLooseMatching("BEE"));
   EXPECT_FALSE(nameToCodepointLooseMatching("BEET"));
   EXPECT_FALSE(nameToCodepointLooseMatching("BEETL"));
   EXPECT_TRUE(nameToCodepointLooseMatching("BEETLE"));
 }

 } // namespace

 bool operator==(MatchForCodepointName a, MatchForCodepointName b) {
   return a.Name == b.Name && a.Distance == b.Distance && a.Value == b.Value;
 }

 namespace {

 TEST(Unicode, nearestMatchesForCodepointName) {
   auto Normalize = [](StringRef Name) {
     std::string Out;
     Out.reserve(Name.size());
     for (char C : Name) {
       if (isAlnum(C))
         Out.push_back(toUpper(C));
     }
     return Out;
   };

   auto L = [&](StringRef name) {
     auto v = nearestMatchesForCodepointName(name, 3);
     for (auto &r : v) {
       auto A = Normalize(r.Name);
       auto B = Normalize(name);
       EXPECT_EQ(StringRef(A).edit_distance(B, true), r.Distance);
     }
     return v;
   };
   using ::testing::ElementsAre;
   using M = MatchForCodepointName;

   ASSERT_THAT(L(""), ElementsAre(M{"OX", 2, 0x1F402}, M{"ANT", 3, 0x1F41C},
                                  M{"ARC", 3, 0x2312}));
   // shortest name
   ASSERT_THAT(L("OX"), ElementsAre(M{"OX", 0, 0x1F402}, M{"AXE", 2, 0x1FA93},
                                    M{"BOY", 2, 0x1F466}));

   // longest name
   ASSERT_THAT(L("ARABIC LIGATURE UIGHUR KIRGHIZ YEH WITH HAMZA ABOVE WITH ALEF "
                 "MAKSURA INITIAL FORM"),
               ElementsAre(M{"ARABIC LIGATURE UIGHUR KIRGHIZ YEH WITH HAMZA "
                             "ABOVE WITH ALEF MAKSURA INITIAL FORM",
                             0, 0xFBFB},
                           M{"ARABIC LIGATURE UIGHUR KIRGHIZ YEH WITH HAMZA "
                             "ABOVE WITH ALEF MAKSURA FINAL FORM",
                             4, 0xFBFA},
                           M{"ARABIC LIGATURE UIGHUR KIRGHIZ YEH WITH HAMZA "
                             "ABOVE WITH ALEF MAKSURA ISOLATED FORM",
                             7, 0xFBF9}));

   // same result with underscore, spaces, etc
   ASSERT_THAT(L("______ARABICLIGATUREUIGHUR KIRGHIZ YEH with HAMZA ABOVE WITH "
                 "ALEF MAKsURAINITIAL form_"),
               ElementsAre(M{"ARABIC LIGATURE UIGHUR KIRGHIZ YEH WITH HAMZA "
                             "ABOVE WITH ALEF MAKSURA INITIAL FORM",
                             0, 0xFBFB},
                           M{"ARABIC LIGATURE UIGHUR KIRGHIZ YEH WITH HAMZA "
                             "ABOVE WITH ALEF MAKSURA FINAL FORM",
                             4, 0xFBFA},
                           M{"ARABIC LIGATURE UIGHUR KIRGHIZ YEH WITH HAMZA "
                             "ABOVE WITH ALEF MAKSURA ISOLATED FORM",
                             7, 0xFBF9}));

   ASSERT_THAT(L("GREEK CAPITAL LETTER LAMBDA"),
               ElementsAre(M{"GREEK CAPITAL LETTER LAMDA", 1, 0x39B},
                           M{"GREEK CAPITAL LETTER GAMMA", 3, 0x0393},
                           M{"GREEK CAPITAL LETTER ALPHA", 4, 0x0391}));

   ASSERT_THAT(L("greekcapitalletter-lambda"),
               ElementsAre(M{"GREEK CAPITAL LETTER LAMDA", 1, 0x39B},
                           M{"GREEK CAPITAL LETTER GAMMA", 3, 0x0393},
                           M{"GREEK CAPITAL LETTER ALPHA", 4, 0x0391}));

   // typo http://www.unicode.org/notes/tn27/tn27-5.html
   ASSERT_THAT(
       L("PRESENTATION FORM FOR VERTICAL RIGHT WHITE LENTICULAR BRAKCET"),
       ElementsAre(
           M{"PRESENTATION FORM FOR VERTICAL RIGHT WHITE LENTICULAR BRAKCET", 0,
             0xFE18}, // typo
           M{"PRESENTATION FORM FOR VERTICAL RIGHT WHITE LENTICULAR BRACKET", 2,
             0xFE18}, // correction
           M{"PRESENTATION FORM FOR VERTICAL LEFT WHITE LENTICULAR BRACKET", 6,
             0xFE17}));

   // typo http://www.unicode.org/notes/tn27/tn27-5.html
   ASSERT_THAT(
       L("BYZANTINE MUSICAL SYMBOL FHTORA SKLIRON CHROMA VASIS"),
       ElementsAre(
           M{"BYZANTINE MUSICAL SYMBOL FHTORA SKLIRON CHROMA VASIS", 0, 0x1D0C5},
           M{"BYZANTINE MUSICAL SYMBOL FTHORA SKLIRON CHROMA VASIS", 2, 0x1D0C5},
           M{"BYZANTINE MUSICAL SYMBOL FTHORA SKLIRON CHROMA SYNAFI", 7,
             0x1D0C6}));
 }

 } // namespace
 } // namespace unicode
 } // namespace sys
 } // namespace llvm
	//===- unittests/Support/UnicodeTest.cpp - Unicode.h tests ----------------===//
	//
	// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
	// See https://llvm.org/LICENSE.txt for license information.
	// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
	//
	//===----------------------------------------------------------------------===//

	#include "llvm/Support/Unicode.h"
	#include "llvm/ADT/StringExtras.h"
	#include "llvm/ADT/edit_distance.h"
	#include "llvm/Support/ConvertUTF.h"
	#include "gmock/gmock.h"
	#include "gtest/gtest.h"

	namespace llvm {
	namespace sys {
	namespace unicode {
	namespace {

	TEST(Unicode, columnWidthUTF8) {
	EXPECT_EQ(0, columnWidthUTF8(""));
	EXPECT_EQ(1, columnWidthUTF8(" "));
	EXPECT_EQ(1, columnWidthUTF8("a"));
	EXPECT_EQ(1, columnWidthUTF8("~"));

	EXPECT_EQ(6, columnWidthUTF8("abcdef"));

	EXPECT_EQ(-1, columnWidthUTF8("\x01"));
	EXPECT_EQ(-1, columnWidthUTF8("\t"));
	EXPECT_EQ(-1, columnWidthUTF8("aaaaaaaaaa\x01"));
	EXPECT_EQ(-1, columnWidthUTF8("\342\200\213")); // 200B ZERO WIDTH SPACE

	// 00AD SOFT HYPHEN is displayed on most terminals as a space or a dash. Some
	// text editors display it only when a line is broken at it, some use it as a
	// line-break hint, but don't display. We choose terminal-oriented
	// interpretation.
	EXPECT_EQ(1, columnWidthUTF8("\302\255"));

	EXPECT_EQ(0, columnWidthUTF8("\314\200")); // 0300 COMBINING GRAVE ACCENT
	EXPECT_EQ(1, columnWidthUTF8("\340\270\201")); // 0E01 THAI CHARACTER KO KAI
	EXPECT_EQ(2, columnWidthUTF8("\344\270\200")); // CJK UNIFIED IDEOGRAPH-4E00

	EXPECT_EQ(4, columnWidthUTF8("\344\270\200\344\270\200"));
	EXPECT_EQ(3, columnWidthUTF8("q\344\270\200"));
	EXPECT_EQ(3, columnWidthUTF8("\314\200\340\270\201\344\270\200"));

	EXPECT_EQ(2, columnWidthUTF8("\342\214\232")); // U+231A WATCH (emoji)
	EXPECT_EQ(2, columnWidthUTF8("\360\237\253\233")); // U+1FADB PEA POD (Unicode 15 emoji)
	EXPECT_EQ(2, columnWidthUTF8("\360\233\204\262")); // U+1B132 HIRAGANA LETTER SMALL KO
	EXPECT_EQ(2, columnWidthUTF8("\360\227\201\202")); // U+17042 TANGUT IDEOGRAPH

	// Invalid UTF-8 strings, columnWidthUTF8 should error out.
	EXPECT_EQ(-2, columnWidthUTF8("\344"));
	EXPECT_EQ(-2, columnWidthUTF8("\344\270"));
	EXPECT_EQ(-2, columnWidthUTF8("\344\270\033"));
	EXPECT_EQ(-2, columnWidthUTF8("\344\270\300"));
	EXPECT_EQ(-2, columnWidthUTF8("\377\366\355"));

	EXPECT_EQ(-2, columnWidthUTF8("qwer\344"));
	EXPECT_EQ(-2, columnWidthUTF8("qwer\344\270"));
	EXPECT_EQ(-2, columnWidthUTF8("qwer\344\270\033"));
	EXPECT_EQ(-2, columnWidthUTF8("qwer\344\270\300"));
	EXPECT_EQ(-2, columnWidthUTF8("qwer\377\366\355"));

	// UTF-8 sequences longer than 4 bytes correspond to unallocated Unicode
	// characters.
	EXPECT_EQ(-2, columnWidthUTF8("\370\200\200\200\200")); // U+200000
	EXPECT_EQ(-2, columnWidthUTF8("\374\200\200\200\200\200")); // U+4000000
	}

	TEST(Unicode, isPrintable) {
	EXPECT_FALSE(isPrintable(0)); // <control-0000>-<control-001F>
	EXPECT_FALSE(isPrintable(0x01));
	EXPECT_FALSE(isPrintable(0x1F));
	EXPECT_TRUE(isPrintable(' '));
	EXPECT_TRUE(isPrintable('A'));
	EXPECT_TRUE(isPrintable('~'));
	EXPECT_FALSE(isPrintable(0x7F)); // <control-007F>..<control-009F>
	EXPECT_FALSE(isPrintable(0x90));
	EXPECT_FALSE(isPrintable(0x9F));

	EXPECT_TRUE(isPrintable(0xAC));
	EXPECT_TRUE(isPrintable(0xAD)); // SOFT HYPHEN is displayed on most terminals
	// as either a space or a dash.
	EXPECT_TRUE(isPrintable(0xAE));

	EXPECT_TRUE(isPrintable(0x0377)); // GREEK SMALL LETTER PAMPHYLIAN DIGAMMA
	EXPECT_FALSE(isPrintable(0x0378)); // <reserved-0378>..<reserved-0379>

	EXPECT_FALSE(isPrintable(0x0600)); // ARABIC NUMBER SIGN

	EXPECT_FALSE(isPrintable(0x1FFFF)); // <reserved-1F774>..<noncharacter-1FFFF>
	EXPECT_TRUE(isPrintable(0x20000)); // CJK UNIFIED IDEOGRAPH-20000

	EXPECT_FALSE(isPrintable(0x10FFFF)); // noncharacter

	// test the validity of a fast path in columnWidthUTF8
	for (unsigned char c = 0; c < 128; ++c) {
	const UTF8 buf8[2] = {c, 0};
	const UTF8 *Target8 = &buf8[0];
	UTF32 buf32[1];
	UTF32 *Target32 = &buf32[0];
	auto status = ConvertUTF8toUTF32(&Target8, Target8 + 1, &Target32,
	Target32 + 1, strictConversion);
	EXPECT_EQ(status, conversionOK);
	EXPECT_EQ((columnWidthUTF8(reinterpret_cast<const char *>(buf8)) == 1),
	(bool)isPrintable(buf32[0]));
	}
	}

	TEST(Unicode, nameToCodepointStrict) {
	auto map = [](StringRef Str) {
	return nameToCodepointStrict(Str).value_or(0xFFFF'FFFF);
	};

	// generated codepoints
	EXPECT_EQ(0x03400u, map("CJK UNIFIED IDEOGRAPH-3400"));
	EXPECT_EQ(0x04DBFu, map("CJK UNIFIED IDEOGRAPH-4DBF"));
	EXPECT_EQ(0x04E00u, map("CJK UNIFIED IDEOGRAPH-4E00"));
	EXPECT_EQ(0x09FFCu, map("CJK UNIFIED IDEOGRAPH-9FFC"));
	EXPECT_EQ(0x20000u, map("CJK UNIFIED IDEOGRAPH-20000"));
	EXPECT_EQ(0x2A6DDu, map("CJK UNIFIED IDEOGRAPH-2A6DD"));
	EXPECT_EQ(0x2A700u, map("CJK UNIFIED IDEOGRAPH-2A700"));
	EXPECT_EQ(0x2B740u, map("CJK UNIFIED IDEOGRAPH-2B740"));
	EXPECT_EQ(0x2B81Du, map("CJK UNIFIED IDEOGRAPH-2B81D"));
	EXPECT_EQ(0x2B820u, map("CJK UNIFIED IDEOGRAPH-2B820"));
	EXPECT_EQ(0x2CEA1u, map("CJK UNIFIED IDEOGRAPH-2CEA1"));
	EXPECT_EQ(0x2CEB0u, map("CJK UNIFIED IDEOGRAPH-2CEB0"));
	EXPECT_EQ(0x2EBE0u, map("CJK UNIFIED IDEOGRAPH-2EBE0"));
	EXPECT_EQ(0x30000u, map("CJK UNIFIED IDEOGRAPH-30000"));
	EXPECT_EQ(0x3134Au, map("CJK UNIFIED IDEOGRAPH-3134A"));
	EXPECT_EQ(0x17000u, map("TANGUT IDEOGRAPH-17000"));
	EXPECT_EQ(0x187F7u, map("TANGUT IDEOGRAPH-187F7"));
	EXPECT_EQ(0x18D00u, map("TANGUT IDEOGRAPH-18D00"));
	EXPECT_EQ(0x18D08u, map("TANGUT IDEOGRAPH-18D08"));
	EXPECT_EQ(0x18B00u, map("KHITAN SMALL SCRIPT CHARACTER-18B00"));
	EXPECT_EQ(0x18CD5u, map("KHITAN SMALL SCRIPT CHARACTER-18CD5"));
	EXPECT_EQ(0x1B170u, map("NUSHU CHARACTER-1B170"));
	EXPECT_EQ(0x1B2FBu, map("NUSHU CHARACTER-1B2FB"));
	EXPECT_EQ(0x0F900u, map("CJK COMPATIBILITY IDEOGRAPH-F900"));
	EXPECT_EQ(0x0FA6Du, map("CJK COMPATIBILITY IDEOGRAPH-FA6D"));
	EXPECT_EQ(0x0FA70u, map("CJK COMPATIBILITY IDEOGRAPH-FA70"));
	EXPECT_EQ(0x0FAD9u, map("CJK COMPATIBILITY IDEOGRAPH-FAD9"));
	EXPECT_EQ(0x2F800u, map("CJK COMPATIBILITY IDEOGRAPH-2F800"));
	EXPECT_EQ(0x2FA1Du, map("CJK COMPATIBILITY IDEOGRAPH-2FA1D"));
	EXPECT_EQ(0x31350u, map("CJK UNIFIED IDEOGRAPH-31350")); // Unicode 15.0

	EXPECT_EQ(0xAC00u, map("HANGUL SYLLABLE GA"));
	EXPECT_EQ(0xAC14u, map("HANGUL SYLLABLE GASS"));
	EXPECT_EQ(0xAC2Bu, map("HANGUL SYLLABLE GAELH"));
	EXPECT_EQ(0xAC7Bu, map("HANGUL SYLLABLE GEOLB"));
	EXPECT_EQ(0xC640u, map("HANGUL SYLLABLE WA"));
	EXPECT_EQ(0xC544u, map("HANGUL SYLLABLE A"));
	EXPECT_EQ(0xC5D0u, map("HANGUL SYLLABLE E"));
	EXPECT_EQ(0xC774u, map("HANGUL SYLLABLE I"));

	EXPECT_EQ(0x1F984u, map("UNICORN FACE"));
	EXPECT_EQ(0x00640u, map("ARABIC TATWEEL"));
	EXPECT_EQ(0x02C05u, map("GLAGOLITIC CAPITAL LETTER YESTU"));
	EXPECT_EQ(0x13000u, map("EGYPTIAN HIEROGLYPH A001"));
	EXPECT_EQ(0x02235u, map("BECAUSE"));
	EXPECT_EQ(0x1F514u, map("BELL"));
	EXPECT_EQ(0x1F9A9u, map("FLAMINGO"));
	EXPECT_EQ(0x1F9A9u, map("FLAMINGO"));
	EXPECT_EQ(0x1F402u, map("OX")); // 2 characters
	EXPECT_EQ(0x0FBF9u, map("ARABIC LIGATURE UIGHUR KIRGHIZ YEH WITH HAMZA "
	"ABOVE WITH ALEF MAKSURA ISOLATED FORM"));
	EXPECT_EQ(0x11F04u, map("KAWI LETTER A")); // Unicode 15.0
	EXPECT_EQ(0x1FA77u, map("PINK HEART")); // Unicode 15.0

	// Aliases
	EXPECT_EQ(0x0000u, map("NULL"));
	EXPECT_EQ(0x0007u, map("ALERT"));
	EXPECT_EQ(0x0009u, map("HORIZONTAL TABULATION"));
	EXPECT_EQ(0x0009u, map("CHARACTER TABULATION"));
	EXPECT_EQ(0x000Au, map("LINE FEED"));
	EXPECT_EQ(0x000Au, map("NEW LINE"));
	EXPECT_EQ(0x0089u, map("CHARACTER TABULATION WITH JUSTIFICATION"));
	EXPECT_EQ(0x0089u, map("HORIZONTAL TABULATION WITH JUSTIFICATION"));
	EXPECT_EQ(0x2118u,
	map("WEIERSTRASS ELLIPTIC FUNCTION")); // correction
	EXPECT_EQ(0x2118u, map("SCRIPT CAPITAL P")); // correction
	EXPECT_EQ(0xFEFFu, map("BYTE ORDER MARK")); // alternate
	EXPECT_EQ(0xFEFFu, map("ZERO WIDTH NO-BREAK SPACE")); // alternate

	// Should perform exact case match
	EXPECT_EQ(0xFFFFFFFFu, map(""));
	EXPECT_EQ(0xFFFFFFFFu, map("NOT A UNICODE CHARACTER"));
	EXPECT_EQ(0xFFFFFFFFu, map("unicorn face"));
	EXPECT_EQ(0xFFFFFFFFu, map("UNICORN FaCE"));
	EXPECT_EQ(0xFFFFFFFFu, map("UNICORNFaCE"));
	EXPECT_EQ(0xFFFFFFFFu, map("UNICORN"));
	EXPECT_EQ(0xFFFFFFFFu, map("HANGUL SYLLABLE i"));
	EXPECT_EQ(0xFFFFFFFFu, map("hANGUL SYLLABLE i"));
	EXPECT_EQ(0xFFFFFFFFu, map("HANGULSYLLABLEI"));
	EXPECT_EQ(0xFFFFFFFFu, map("HANGUL SYLLABLE"));
	EXPECT_EQ(0xFFFFFFFFu, map("cJK COMPATIBILITY IDEOGRAPH-2FA1D"));
	EXPECT_EQ(0xFFFFFFFFu, map("CJK COMPATIBILITY IDEOGRAPH-2FA1d"));
	EXPECT_EQ(0xFFFFFFFFu, map("CJK COMPATIBILITY IDEOGRAPH 2FA1D"));
	EXPECT_EQ(0xFFFFFFFF, map("CJK COMPATIBILITY IDEOGRAPH-NOTANUMBER"));
	EXPECT_EQ(0xFFFFFFFFu, map("CJK COMPATIBILITY IDEOGRAPH-1"));
	EXPECT_EQ(0xFFFFFFFFu, map("ZERO WIDTH NO BREAK SPACE"));

	// Should not support abbreviations or figments
	EXPECT_EQ(0xFFFFFFFFu, map("FVS1"));
	EXPECT_EQ(0xFFFFFFFFu, map("HIGH OCTET PRESET"));
	EXPECT_EQ(0xFFFFFFFFu, map("BEL"));
	}

	TEST(Unicode, nameToCodepointLoose) {
	auto map = [](StringRef Str) {
	auto Opt = nameToCodepointLooseMatching(Str);
	if (!Opt)
	return char32_t(0xFFFF'FFFF);
	return Opt->CodePoint;
	};

	// generated codepoints
	EXPECT_EQ(0x04DBFu, map("CJK UNIFIED IDEOGRAPH-4DBF"));
	EXPECT_EQ(0x04E00u, map("CJK UNIFIED IDEOGRAPH-4E00"));
	EXPECT_EQ(0x09FFCu, map("CJK UNIFIED IDEOGRAPH-9FFC"));
	EXPECT_EQ(0x20000u, map("CJK UNIFIED IDEOGRAPH-20000"));
	EXPECT_EQ(0x2A6DDu, map("CJK UNIFIED IDEOGRAPH-2A6DD"));
	EXPECT_EQ(0x2A700u, map("CJK UNIFIED IDEOGRAPH-2A700"));
	EXPECT_EQ(0x2B740u, map("CJK UNIFIED IDEOGRAPH-2B740"));
	EXPECT_EQ(0x03400u, map("CJK UNIFIED IDEOGRAPH-3400"));
	EXPECT_EQ(0x2B81Du, map("CJK UNIFIED IDEOGRAPH-2B81D"));
	EXPECT_EQ(0x2B820u, map("CJK UNIFIED IDEOGRAPH-2B820"));
	EXPECT_EQ(0x2CEA1u, map("CJK UNIFIED IDEOGRAPH-2CEA1"));
	EXPECT_EQ(0x2CEB0u, map("CJK UNIFIED IDEOGRAPH-2CEB0"));
	EXPECT_EQ(0x2EBE0u, map("CJK UNIFIED IDEOGRAPH-2EBE0"));
	EXPECT_EQ(0x30000u, map("CJK UNIFIED IDEOGRAPH-30000"));
	EXPECT_EQ(0x3134Au, map("CJK UNIFIED IDEOGRAPH-3134A"));
	EXPECT_EQ(0x17000u, map("TANGUT IDEOGRAPH-17000"));
	EXPECT_EQ(0x187F7u, map("TANGUT IDEOGRAPH-187F7"));
	EXPECT_EQ(0x18D00u, map("TANGUT IDEOGRAPH-18D00"));
	EXPECT_EQ(0x18D08u, map("TANGUT IDEOGRAPH-18D08"));
	EXPECT_EQ(0x18B00u, map("KHITAN SMALL SCRIPT CHARACTER-18B00"));
	EXPECT_EQ(0x18CD5u, map("KHITAN SMALL SCRIPT CHARACTER-18CD5"));
	EXPECT_EQ(0x1B170u, map("NUSHU CHARACTER-1B170"));
	EXPECT_EQ(0x1B2FBu, map("NUSHU CHARACTER-1B2FB"));
	EXPECT_EQ(0x0F900u, map("CJK COMPATIBILITY IDEOGRAPH-F900"));
	EXPECT_EQ(0x0FA6Du, map("CJK COMPATIBILITY IDEOGRAPH-FA6D"));
	EXPECT_EQ(0x0FA70u, map("CJK COMPATIBILITY IDEOGRAPH-FA70"));
	EXPECT_EQ(0x0FAD9u, map("CJK COMPATIBILITY IDEOGRAPH-FAD9"));
	EXPECT_EQ(0x2F800u, map("CJK COMPATIBILITY IDEOGRAPH-2F800"));
	EXPECT_EQ(0x2FA1Du, map("CJK COMPATIBILITY IDEOGRAPH-2FA1D"));

	EXPECT_EQ(0xAC00u, map("HANGUL SYLLABLE GA"));
	EXPECT_EQ(0xAC14u, map("HANGUL SYLLABLE GASS"));
	EXPECT_EQ(0xAC2Bu, map("HANGUL SYLLABLE GAELH"));
	EXPECT_EQ(0xAC7Bu, map("HANGUL SYLLABLE GEOLB"));
	EXPECT_EQ(0xC640u, map("HANGUL SYLLABLE WA"));
	EXPECT_EQ(0xC544u, map("HANGUL SYLLABLE A"));
	EXPECT_EQ(0xC5D0u, map("HANGUL SYLLABLE E"));
	EXPECT_EQ(0xC774u, map("HANGUL SYLLABLE I"));

	EXPECT_EQ(0x1F984u, map("UNICORN FACE"));
	EXPECT_EQ(0x00640u, map("ARABIC TATWEEL"));
	EXPECT_EQ(0x02C05u, map("GLAGOLITIC CAPITAL LETTER YESTU"));
	EXPECT_EQ(0x13000u, map("EGYPTIAN HIEROGLYPH A001"));
	EXPECT_EQ(0x02235u, map("BECAUSE"));
	EXPECT_EQ(0x1F514u, map("BELL"));
	EXPECT_EQ(0x1F9A9u, map("FLAMINGO"));
	EXPECT_EQ(0x1F402u, map("OX")); // 2 characters
	EXPECT_EQ(0x0FBF9u, map("ARABIC LIGATURE UIGHUR KIRGHIZ YEH WITH HAMZA "
	"ABOVE WITH ALEF MAKSURA ISOLATED FORM"));

	// Aliases
	EXPECT_EQ(0x0000u, map("NULL"));
	EXPECT_EQ(0x0007u, map("ALERT"));
	EXPECT_EQ(0x0009u, map("HORIZONTAL TABULATION"));
	EXPECT_EQ(0x0009u, map("CHARACTER TABULATION"));
	EXPECT_EQ(0x000Au, map("LINE FEED"));
	EXPECT_EQ(0x000Au, map("NEW LINE"));
	EXPECT_EQ(0x0089u, map("CHARACTER TABULATION WITH JUSTIFICATION"));
	EXPECT_EQ(0x0089u, map("HORIZONTAL TABULATION WITH JUSTIFICATION"));
	EXPECT_EQ(0x2118u,
	map("WEIERSTRASS ELLIPTIC FUNCTION")); // correction
	EXPECT_EQ(0x2118u, map("SCRIPT CAPITAL P")); // correction
	EXPECT_EQ(0xFEFFu, map("BYTE ORDER MARK")); // alternate
	EXPECT_EQ(0xFEFFu, map("ZERO WIDTH NO-BREAK SPACE")); // alternate
	EXPECT_EQ(0xFEFFu, map("ZERO WIDTH NO BREAK SPACE")); // alternate

	// Should perform loose matching
	EXPECT_EQ(0xFFFFFFFFu, map(""));
	EXPECT_EQ(0xFFFFFFFFu, map("NOT A UNICODE CHARACTER"));
	EXPECT_EQ(0x0001F984u, map("unicorn face"));
	EXPECT_EQ(0x0001F984u, map("UNICORN FaCE"));
	EXPECT_EQ(0x0001F984u, map("UNICORNFaCE"));
	EXPECT_EQ(0xFFFFFFFFu, map("UNICORN"));
	EXPECT_EQ(0xC774u, map("HANGUL SYLLABLE i"));
	EXPECT_EQ(0xC774u, map("hANGUL SYLLABLE i"));
	EXPECT_EQ(0xC774u, map("HANGULSYLLABLEI"));
	EXPECT_EQ(0xFFFFFFFFu, map("HANGUL SYLLABLE"));

	EXPECT_EQ(0x2FA1Du, map("cJK COMPATIBILITY IDEOGRAPH-2FA1D"));
	EXPECT_EQ(0x2FA1Du, map("CJK COMPATIBILITY IDEOGRAPH-2FA1d"));
	EXPECT_EQ(0x2FA1Du, map("CJK COMPATIBILITY IDEOGRAPH 2FA1D"));

	EXPECT_EQ(0xFFFFFFFFu, map("CJK COMPATIBILITY IDEOGRAPH-NOTANUMBER"));
	EXPECT_EQ(0xFFFFFFFFu, map("CJK COMPATIBILITY IDEOGRAPH-1"));

	// https://unicode.org/reports/tr44/#Matching_Names
	// UAX44-LM2: Medial hypens are ignored, non medial hyphens are not
	EXPECT_EQ(0x1FBC5u, map("S-T-I-C-K-F-I-G-U-R-E"));
	EXPECT_EQ(0xFFFFFFFFu, map("-STICK FIGURE"));
	EXPECT_EQ(0xFFFFFFFFu, map("STICK FIGURE-"));
	EXPECT_EQ(0xFFFFFFFFu, map("STICK FIGURE -"));
	EXPECT_EQ(0xFFFFFFFFu, map("STICK FIGURE --"));
	EXPECT_EQ(0xFFFFFFFFu, map("STICK--FIGURE"));

	EXPECT_EQ(0x0F68u, map("TIBETAN LETTER A"));
	EXPECT_EQ(0x0F68u, map("TIBETAN LETTERA"));
	EXPECT_EQ(0x0F68u, map("TIBETAN LETTER-A"));
	EXPECT_EQ(0x0F60u, map("TIBETAN LETTER -A"));
	EXPECT_EQ(0x0F60u, map("TIBETAN LETTER -A"));
	;

	// special case
	EXPECT_EQ(0x1180u, map("HANGUL JUNGSEONG O-E"));
	EXPECT_EQ(0x116Cu, map("HANGUL JUNGSEONG OE"));

	// names that are prefix to existing characters should not match
	EXPECT_FALSE(nameToCodepointLooseMatching("B"));
	EXPECT_FALSE(nameToCodepointLooseMatching("BE"));
	EXPECT_FALSE(nameToCodepointLooseMatching("BEE"));
	EXPECT_FALSE(nameToCodepointLooseMatching("BEET"));
	EXPECT_FALSE(nameToCodepointLooseMatching("BEETL"));
	EXPECT_TRUE(nameToCodepointLooseMatching("BEETLE"));
	}

	} // namespace

	bool operator==(MatchForCodepointName a, MatchForCodepointName b) {
	return a.Name == b.Name && a.Distance == b.Distance && a.Value == b.Value;
	}

	namespace {

	TEST(Unicode, nearestMatchesForCodepointName) {
	auto Normalize = [](StringRef Name) {
	std::string Out;
	Out.reserve(Name.size());
	for (char C : Name) {
	if (isAlnum(C))
	Out.push_back(toUpper(C));
	}
	return Out;
	};

	auto L = [&](StringRef name) {
	auto v = nearestMatchesForCodepointName(name, 3);
	for (auto &r : v) {
	auto A = Normalize(r.Name);
	auto B = Normalize(name);
	EXPECT_EQ(StringRef(A).edit_distance(B, true), r.Distance);
	}
	return v;
	};
	using ::testing::ElementsAre;
	using M = MatchForCodepointName;

	ASSERT_THAT(L(""), ElementsAre(M{"OX", 2, 0x1F402}, M{"ANT", 3, 0x1F41C},
	M{"ARC", 3, 0x2312}));
	// shortest name
	ASSERT_THAT(L("OX"), ElementsAre(M{"OX", 0, 0x1F402}, M{"AXE", 2, 0x1FA93},
	M{"BOY", 2, 0x1F466}));

	// longest name
	ASSERT_THAT(L("ARABIC LIGATURE UIGHUR KIRGHIZ YEH WITH HAMZA ABOVE WITH ALEF "
	"MAKSURA INITIAL FORM"),
	ElementsAre(M{"ARABIC LIGATURE UIGHUR KIRGHIZ YEH WITH HAMZA "
	"ABOVE WITH ALEF MAKSURA INITIAL FORM",
	0, 0xFBFB},
	M{"ARABIC LIGATURE UIGHUR KIRGHIZ YEH WITH HAMZA "
	"ABOVE WITH ALEF MAKSURA FINAL FORM",
	4, 0xFBFA},
	M{"ARABIC LIGATURE UIGHUR KIRGHIZ YEH WITH HAMZA "
	"ABOVE WITH ALEF MAKSURA ISOLATED FORM",
	7, 0xFBF9}));

	// same result with underscore, spaces, etc
	ASSERT_THAT(L("______ARABICLIGATUREUIGHUR KIRGHIZ YEH with HAMZA ABOVE WITH "
	"ALEF MAKsURAINITIAL form_"),
	ElementsAre(M{"ARABIC LIGATURE UIGHUR KIRGHIZ YEH WITH HAMZA "
	"ABOVE WITH ALEF MAKSURA INITIAL FORM",
	0, 0xFBFB},
	M{"ARABIC LIGATURE UIGHUR KIRGHIZ YEH WITH HAMZA "
	"ABOVE WITH ALEF MAKSURA FINAL FORM",
	4, 0xFBFA},
	M{"ARABIC LIGATURE UIGHUR KIRGHIZ YEH WITH HAMZA "
	"ABOVE WITH ALEF MAKSURA ISOLATED FORM",
	7, 0xFBF9}));

	ASSERT_THAT(L("GREEK CAPITAL LETTER LAMBDA"),
	ElementsAre(M{"GREEK CAPITAL LETTER LAMDA", 1, 0x39B},
	M{"GREEK CAPITAL LETTER GAMMA", 3, 0x0393},
	M{"GREEK CAPITAL LETTER ALPHA", 4, 0x0391}));

	ASSERT_THAT(L("greekcapitalletter-lambda"),
	ElementsAre(M{"GREEK CAPITAL LETTER LAMDA", 1, 0x39B},
	M{"GREEK CAPITAL LETTER GAMMA", 3, 0x0393},
	M{"GREEK CAPITAL LETTER ALPHA", 4, 0x0391}));

	// typo http://www.unicode.org/notes/tn27/tn27-5.html
	ASSERT_THAT(
	L("PRESENTATION FORM FOR VERTICAL RIGHT WHITE LENTICULAR BRAKCET"),
	ElementsAre(
	M{"PRESENTATION FORM FOR VERTICAL RIGHT WHITE LENTICULAR BRAKCET", 0,
	0xFE18}, // typo
	M{"PRESENTATION FORM FOR VERTICAL RIGHT WHITE LENTICULAR BRACKET", 2,
	0xFE18}, // correction
	M{"PRESENTATION FORM FOR VERTICAL LEFT WHITE LENTICULAR BRACKET", 6,
	0xFE17}));

	// typo http://www.unicode.org/notes/tn27/tn27-5.html
	ASSERT_THAT(
	L("BYZANTINE MUSICAL SYMBOL FHTORA SKLIRON CHROMA VASIS"),
	ElementsAre(
	M{"BYZANTINE MUSICAL SYMBOL FHTORA SKLIRON CHROMA VASIS", 0, 0x1D0C5},
	M{"BYZANTINE MUSICAL SYMBOL FTHORA SKLIRON CHROMA VASIS", 2, 0x1D0C5},
	M{"BYZANTINE MUSICAL SYMBOL FTHORA SKLIRON CHROMA SYNAFI", 7,
	0x1D0C6}));
	}

	} // namespace
	} // namespace unicode
	} // namespace sys
	} // namespace llvm