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Improve width estimation (#2033)

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This commit is contained in:
Victor Zverovich 2021-02-13 09:24:39 -08:00
parent 13b117b5bc
commit 7e72673d87
3 changed files with 25 additions and 3 deletions
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23
include/fmt/format.h
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@ -695,7 +695,28 @@ FMT_CONSTEXPR inline size_t compute_width(string_view s) {
// It is not a lambda for compatibility with C++14.
struct count_code_points {
size_t* count;
FMT_CONSTEXPR void operator()(uint32_t, int) const { ++*count; }
FMT_CONSTEXPR void operator()(uint32_t cp, int error) const {
*count +=
1 +
(error == 0 && cp >= 0x1100 &&
(cp <= 0x115f || // Hangul Jamo init. consonants
cp == 0x2329 || // LEFT-POINTING ANGLE BRACKET〈
cp == 0x232a || // RIGHT-POINTING ANGLE BRACKET 〉
// CJK ... Yi except Unicode Character “〿”:
(cp >= 0x2e80 && cp <= 0xa4cf && cp != 0x303f) ||
(cp >= 0xac00 && cp <= 0xd7a3) || // Hangul Syllables
(cp >= 0xf900 && cp <= 0xfaff) || // CJK Compatibility Ideographs
(cp >= 0xfe10 && cp <= 0xfe19) || // Vertical Forms
(cp >= 0xfe30 && cp <= 0xfe6f) || // CJK Compatibility Forms
(cp >= 0xff00 && cp <= 0xff60) || // Fullwidth Forms
(cp >= 0xffe0 && cp <= 0xffe6) || // Fullwidth Forms
(cp >= 0x20000 && cp <= 0x2fffd) || // CJK
(cp >= 0x30000 && cp <= 0x3fffd) ||
// Miscellaneous Symbols and Pictographs + Emoticons:
(cp >= 0x1f300 && cp <= 0x1f64f) ||
// Supplemental Symbols and Pictographs:
(cp >= 0x1f900 && cp <= 0x1f9ff)));
}
};
for_each_codepoint(s, count_code_points{&num_code_points});
return num_code_points;

2
test/compile-test.cc
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@ -253,7 +253,7 @@ TEST(CompileTimeFormattingTest, String) {
test_format<17>(FMT_COMPILE("{} is {}"), "The answer", "42"));
EXPECT_EQ("abc**", test_format<6>(FMT_COMPILE("{:*<5}"), "abc"));
EXPECT_EQ("**🤡**", test_format<9>(FMT_COMPILE("{:*^5}"), "🤡"));
EXPECT_EQ("**🤡**", test_format<9>(FMT_COMPILE("{:*^6}"), "🤡"));
}
TEST(CompileTimeFormattingTest, Combination) {

3
test/format-test.cc
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@ -868,7 +868,8 @@ TEST(FormatterTest, Width) {
EXPECT_EQ(" 0xcafe", format("{0:10}", reinterpret_cast<void*>(0xcafe)));
EXPECT_EQ("x ", format("{0:11}", 'x'));
EXPECT_EQ("str ", format("{0:12}", "str"));
EXPECT_EQ(format("{:*^5}", "🤡"), "**🤡**");
EXPECT_EQ(format("{:*^6}", "🤡"), "**🤡**");
EXPECT_EQ(format("{:*^8}", "你好"), "**你好**");
EXPECT_EQ(format("{:#6}", 42.0), " 42.0");
EXPECT_EQ(format("{:6c}", static_cast<int>('x')), "x ");
EXPECT_EQ(format("{:>06.0f}", 0.00884311), "000000");