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The Unicode spec defines much more complicated caseless matching algorithms in its Collation spec. This implements the "basic" case folding comparison.
51 lines
1.4 KiB
C++
51 lines
1.4 KiB
C++
/*
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* Copyright (c) 2023, Tim Flynn <trflynn89@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/String.h>
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#include <AK/StringBuilder.h>
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#include <LibUnicode/UnicodeUtils.h>
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// This file contains definitions of AK::String methods which require UCD data.
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namespace AK {
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ErrorOr<String> String::to_lowercase(Optional<StringView> const& locale) const
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{
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StringBuilder builder;
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TRY(Unicode::Detail::build_lowercase_string(code_points(), builder, locale));
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return builder.to_string();
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}
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ErrorOr<String> String::to_uppercase(Optional<StringView> const& locale) const
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{
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StringBuilder builder;
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TRY(Unicode::Detail::build_uppercase_string(code_points(), builder, locale));
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return builder.to_string();
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}
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ErrorOr<String> String::to_titlecase(Optional<StringView> const& locale) const
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{
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StringBuilder builder;
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TRY(Unicode::Detail::build_titlecase_string(code_points(), builder, locale));
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return builder.to_string();
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}
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ErrorOr<String> String::to_casefold() const
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{
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StringBuilder builder;
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TRY(Unicode::Detail::build_casefold_string(code_points(), builder));
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return builder.to_string();
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}
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// https://www.unicode.org/versions/Unicode15.0.0/ch03.pdf#G34145
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ErrorOr<bool> String::equals_ignoring_case(String const& other) const
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{
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// A string X is a caseless match for a string Y if and only if:
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// toCasefold(X) = toCasefold(Y)
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return TRY(to_casefold()) == TRY(other.to_casefold());
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}
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}
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