llvm/unittests/Support/UnicodeTest.cpp

   1 //===- unittests/Support/UnicodeTest.cpp - Unicode.h tests ----------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "llvm/Support/Unicode.h"
  10 #include "llvm/Support/ConvertUTF.h"
  11 #include "gtest/gtest.h"
  12
  13 namespace llvm {
  14 namespace sys {
  15 namespace unicode {
  16 namespace {
  17
  18 TEST(Unicode, columnWidthUTF8) {
  19   EXPECT_EQ(0, columnWidthUTF8(""));
  20   EXPECT_EQ(1, columnWidthUTF8(" "));
  21   EXPECT_EQ(1, columnWidthUTF8("a"));
  22   EXPECT_EQ(1, columnWidthUTF8("~"));
  23
  24   EXPECT_EQ(6, columnWidthUTF8("abcdef"));
  25
  26   EXPECT_EQ(-1, columnWidthUTF8("\x01"));
  27   EXPECT_EQ(-1, columnWidthUTF8("\t"));
  28   EXPECT_EQ(-1, columnWidthUTF8("aaaaaaaaaa\x01"));
  29   EXPECT_EQ(-1, columnWidthUTF8("\342\200\213")); // 200B ZERO WIDTH SPACE
  30
  31   // 00AD SOFT HYPHEN is displayed on most terminals as a space or a dash. Some
  32   // text editors display it only when a line is broken at it, some use it as a
  33   // line-break hint, but don't display. We choose terminal-oriented
  34   // interpretation.
  35   EXPECT_EQ(1, columnWidthUTF8("\302\255"));
  36
  37   EXPECT_EQ(0, columnWidthUTF8("\314\200"));     // 0300 COMBINING GRAVE ACCENT
  38   EXPECT_EQ(1, columnWidthUTF8("\340\270\201")); // 0E01 THAI CHARACTER KO KAI
  39   EXPECT_EQ(2, columnWidthUTF8("\344\270\200")); // CJK UNIFIED IDEOGRAPH-4E00
  40
  41   EXPECT_EQ(4, columnWidthUTF8("\344\270\200\344\270\200"));
  42   EXPECT_EQ(3, columnWidthUTF8("q\344\270\200"));
  43   EXPECT_EQ(3, columnWidthUTF8("\314\200\340\270\201\344\270\200"));
  44
  45   // Invalid UTF-8 strings, columnWidthUTF8 should error out.
  46   EXPECT_EQ(-2, columnWidthUTF8("\344"));
  47   EXPECT_EQ(-2, columnWidthUTF8("\344\270"));
  48   EXPECT_EQ(-2, columnWidthUTF8("\344\270\033"));
  49   EXPECT_EQ(-2, columnWidthUTF8("\344\270\300"));
  50   EXPECT_EQ(-2, columnWidthUTF8("\377\366\355"));
  51
  52   EXPECT_EQ(-2, columnWidthUTF8("qwer\344"));
  53   EXPECT_EQ(-2, columnWidthUTF8("qwer\344\270"));
  54   EXPECT_EQ(-2, columnWidthUTF8("qwer\344\270\033"));
  55   EXPECT_EQ(-2, columnWidthUTF8("qwer\344\270\300"));
  56   EXPECT_EQ(-2, columnWidthUTF8("qwer\377\366\355"));
  57
  58   // UTF-8 sequences longer than 4 bytes correspond to unallocated Unicode
  59   // characters.
  60   EXPECT_EQ(-2, columnWidthUTF8("\370\200\200\200\200"));     // U+200000
  61   EXPECT_EQ(-2, columnWidthUTF8("\374\200\200\200\200\200")); // U+4000000
  62 }
  63
  64 TEST(Unicode, isPrintable) {
  65   EXPECT_FALSE(isPrintable(0)); // <control-0000>-<control-001F>
  66   EXPECT_FALSE(isPrintable(0x01));
  67   EXPECT_FALSE(isPrintable(0x1F));
  68   EXPECT_TRUE(isPrintable(' '));
  69   EXPECT_TRUE(isPrintable('A'));
  70   EXPECT_TRUE(isPrintable('~'));
  71   EXPECT_FALSE(isPrintable(0x7F)); // <control-007F>..<control-009F>
  72   EXPECT_FALSE(isPrintable(0x90));
  73   EXPECT_FALSE(isPrintable(0x9F));
  74
  75   EXPECT_TRUE(isPrintable(0xAC));
  76   EXPECT_TRUE(isPrintable(0xAD)); // SOFT HYPHEN is displayed on most terminals
  77                                   // as either a space or a dash.
  78   EXPECT_TRUE(isPrintable(0xAE));
  79
  80   EXPECT_TRUE(isPrintable(0x0377));  // GREEK SMALL LETTER PAMPHYLIAN DIGAMMA
  81   EXPECT_FALSE(isPrintable(0x0378)); // <reserved-0378>..<reserved-0379>
  82
  83   EXPECT_FALSE(isPrintable(0x0600)); // ARABIC NUMBER SIGN
  84
  85   EXPECT_FALSE(isPrintable(0x1FFFF)); // <reserved-1F774>..<noncharacter-1FFFF>
  86   EXPECT_TRUE(isPrintable(0x20000));  // CJK UNIFIED IDEOGRAPH-20000
  87
  88   EXPECT_FALSE(isPrintable(0x10FFFF)); // noncharacter
  89
  90   // test the validity of a fast path in columnWidthUTF8
  91   for (unsigned char c = 0; c < 128; ++c) {
  92     const UTF8 buf8[2] = {c, 0};
  93     const UTF8 *Target8 = &buf8[0];
  94     UTF32 buf32[1];
  95     UTF32 *Target32 = &buf32[0];
  96     auto status = ConvertUTF8toUTF32(&Target8, Target8 + 1, &Target32,
  97                                      Target32 + 1, strictConversion);
  98     EXPECT_TRUE(status == conversionOK);
  99     EXPECT_TRUE((columnWidthUTF8(reinterpret_cast<const char *>(buf8)) == 1) ==
 100                 (bool)isPrintable(buf32[0]));
 101   }
 102 }
 103
 104 } // namespace
 105 } // namespace unicode
 106 } // namespace sys
 107 } // namespace llvm