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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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84
AK/Utf16View.cpp
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@ -8,6 +8,7 @@
#include <AK/Concepts.h>
#include <AK/StringBuilder.h>
#include <AK/StringView.h>
#include <AK/Utf16String.h>
#include <AK/Utf16View.h>
#include <AK/Utf32View.h>
#include <AK/Utf8View.h>
@ -129,6 +130,89 @@ ErrorOr<ByteString> Utf16View::to_byte_string(AllowLonelySurrogates allow_lonely
return TRY(to_utf8(allow_lonely_surrogates)).to_byte_string();
}
Utf16String Utf16View::to_ascii_lowercase() const
{
StringBuilder builder(StringBuilder::Mode::UTF16, length_in_code_units());
for (size_t i = 0; i < length_in_code_units(); ++i)
builder.append_code_unit(AK::to_ascii_lowercase(code_unit_at(i)));
return builder.to_utf16_string();
}
Utf16String Utf16View::to_ascii_uppercase() const
{
StringBuilder builder(StringBuilder::Mode::UTF16, length_in_code_units());
for (size_t i = 0; i < length_in_code_units(); ++i)
builder.append_code_unit(AK::to_ascii_uppercase(code_unit_at(i)));
return builder.to_utf16_string();
}
Utf16String Utf16View::to_ascii_titlecase() const
{
StringBuilder builder(StringBuilder::Mode::UTF16, length_in_code_units());
bool next_is_upper = true;
for (size_t i = 0; i < length_in_code_units(); ++i) {
auto code_unit = code_unit_at(i);
if (next_is_upper)
builder.append_code_unit(AK::to_ascii_uppercase(code_unit));
else
builder.append_code_unit(AK::to_ascii_lowercase(code_unit));
next_is_upper = code_unit == u' ';
}
return builder.to_utf16_string();
}
Utf16String Utf16View::replace(Utf16View const& needle, Utf16View const& replacement, ReplaceMode replace_mode) const
{
if (is_empty())
return {};
StringBuilder builder(StringBuilder::Mode::UTF16, length_in_code_units());
auto remaining = *this;
do {
auto index = remaining.find_code_unit_offset(needle);
if (!index.has_value())
break;
builder.append(remaining.substring_view(0, *index));
builder.append(replacement);
remaining = remaining.substring_view(*index + needle.length_in_code_units());
index = remaining.find_code_unit_offset(needle);
} while (replace_mode == ReplaceMode::All && !remaining.is_empty());
builder.append(remaining);
return builder.to_utf16_string();
}
Utf16String Utf16View::escape_html_entities() const
{
StringBuilder builder(StringBuilder::Mode::UTF16, length_in_code_units());
for (auto code_point : *this) {
if (code_point == '<')
builder.append(u"&lt;"sv);
else if (code_point == '>')
builder.append(u"&gt;"sv);
else if (code_point == '&')
builder.append(u"&amp;"sv);
else if (code_point == '"')
builder.append(u"&quot;"sv);
else
builder.append_code_point(code_point);
}
return builder.to_utf16_string();
}
bool Utf16View::is_ascii() const
{
if (has_ascii_storage())