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Move display width table out of function

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This commit is contained in:
Victor Zverovich 2026-09-04 08:44:26 -07:00
parent bc82c408a6
commit 2e6c5741d2
1 changed files with 21 additions and 13 deletions
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34
include/fmt/format.h
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@ -649,16 +649,16 @@ FMT_CONSTEXPR void for_each_codepoint(string_view s, F f) {
} while (buf_ptr < buf + num_chars_left);
}
FMT_CONSTEXPR inline auto display_width_of(uint32_t cp) noexcept -> size_t {
if (cp < 0x1100) return 1;
struct wide_cp_range {
uint32_t first;
uint32_t last;
};
// Code points with display width 2, i.e. those with the Unicode
// East_Asian_Width property set to W(ide) or F(ullwidth)
// (https://www.unicode.org/reports/tr11/), sorted and merged.
constexpr wide_cp_range wide_cp_ranges[] = {
struct wide_cp_range {
uint32_t first;
uint32_t last;
};
// Code points with display width 2, i.e. those with the Unicode 16.0.0
// East_Asian_Width property set to W(ide) or F(ullwidth)
// (https://www.unicode.org/reports/tr11/), sorted and merged.
template <typename = void> struct wide_cp_data {
static constexpr wide_cp_range ranges[] = {
// Hangul Jamo
{0x1100, 0x115f},
// Miscellaneous Technical
@ -811,13 +811,21 @@ FMT_CONSTEXPR inline auto display_width_of(uint32_t cp) noexcept -> size_t {
// CJK Unified Ideographs Extension G (plane 3)
{0x30000, 0x3fffd},
};
};
#if FMT_CPLUSPLUS < 201703L
template <typename T> constexpr wide_cp_range wide_cp_data<T>::ranges[];
#endif
FMT_CONSTEXPR inline auto display_width_of(uint32_t cp) noexcept -> size_t {
if (cp < 0x1100) return 1;
size_t lo = 0;
size_t hi = sizeof(wide_cp_ranges) / sizeof(wide_cp_range);
size_t hi = sizeof(wide_cp_data<>::ranges) / sizeof(wide_cp_range);
while (lo < hi) {
size_t mid = lo + (hi - lo) / 2;
if (cp < wide_cp_ranges[mid].first)
if (cp < wide_cp_data<>::ranges[mid].first)
hi = mid;
else if (cp > wide_cp_ranges[mid].last)
else if (cp > wide_cp_data<>::ranges[mid].last)
lo = mid + 1;
else
return 2;