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Code Issues Projects Releases Packages Wiki Activity Actions 9

AK: Define some UTF-16 helper methods

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* contains
* escape_html_entities
* replace
* to_ascii_lowercase
* to_ascii_uppercase
* to_ascii_titlecase
* trim
* trim_whitespace
This commit is contained in:
Timothy Flynn 2025-06-27 12:30:25 -04:00 • committed by Tim Flynn
commit 6e0290ecaa
Notes: github-actions[bot] 2025-07-18 16:47:12 +00:00
6 changed files with 345 additions and 1 deletions
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49
AK/Utf16View.h
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@ -186,6 +186,10 @@ public:
return MUST(to_utf8(allow_lonely_surrogates));
}
Utf16String to_ascii_lowercase() const;
Utf16String to_ascii_uppercase() const;
Utf16String to_ascii_titlecase() const;
[[nodiscard]] ALWAYS_INLINE bool has_ascii_storage() const { return m_length_in_code_units >> Detail::UTF16_FLAG == 0; }
[[nodiscard]] constexpr ReadonlyBytes bytes() const
@ -243,7 +247,7 @@ public:
return false;
for (size_t i = 0; i < length_in_code_units(); ++i) {
if (to_ascii_lowercase(code_unit_at(i)) != to_ascii_lowercase(other.code_unit_at(i)))
if (AK::to_ascii_lowercase(code_unit_at(i)) != AK::to_ascii_lowercase(other.code_unit_at(i)))
return false;
}
@ -356,6 +360,9 @@ public:
return { m_string.utf16 + length_in_code_units(), 0 };
}
Utf16String replace(Utf16View const& needle, Utf16View const& replacement, ReplaceMode) const;
Utf16String escape_html_entities() const;
[[nodiscard]] constexpr Utf16View substring_view(size_t code_unit_offset, size_t code_unit_length) const
{
VERIFY(code_unit_offset + code_unit_length <= length_in_code_units());
@ -370,6 +377,43 @@ public:
[[nodiscard]] Utf16View unicode_substring_view(size_t code_point_offset, size_t code_point_length) const;
[[nodiscard]] Utf16View unicode_substring_view(size_t code_point_offset) const { return unicode_substring_view(code_point_offset, length_in_code_points() - code_point_offset); }
[[nodiscard]] constexpr Utf16View trim(Utf16View const& code_units, TrimMode mode = TrimMode::Both) const
{
size_t substring_start = 0;
size_t substring_length = length_in_code_units();
if (mode == TrimMode::Left || mode == TrimMode::Both) {
for (size_t i = 0; i < length_in_code_units(); ++i) {
if (substring_length == 0)
return {};
if (!code_units.contains(code_unit_at(i)))
break;
++substring_start;
--substring_length;
}
}
if (mode == TrimMode::Right || mode == TrimMode::Both) {
for (size_t i = length_in_code_units(); i > 0; --i) {
if (substring_length == 0)
return {};
if (!code_units.contains(code_unit_at(i - 1)))
break;
--substring_length;
}
}
return substring_view(substring_start, substring_length);
}
[[nodiscard]] constexpr Utf16View trim_whitespace(TrimMode mode = TrimMode::Both) const
{
static constexpr Utf16View white_space { u" \n\t\v\f\r", 6uz };
return trim(white_space, mode);
}
constexpr Optional<size_t> find_code_unit_offset(char16_t needle, size_t start_offset = 0) const
{
if (start_offset >= length_in_code_units())
@ -434,6 +478,9 @@ public:
return {};
}
[[nodiscard]] constexpr bool contains(char16_t needle) const { return find_code_unit_offset(needle).has_value(); }
[[nodiscard]] constexpr bool contains(Utf16View const& needle) const { return find_code_unit_offset(needle).has_value(); }
[[nodiscard]] constexpr bool starts_with(Utf16View const& needle) const
{
if (needle.is_empty())