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AK: Add hash traits for Utf16View

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This is based on the hash in JS::Utf16StringImpl::compute_hash.
This commit is contained in:
Timothy Flynn 2025-06-19 09:18:07 -04:00 • committed by Tim Flynn
commit a0eb47e2fc
Notes: github-actions[bot] 2025-07-03 13:53:35 +00:00
1 changed files with 20 additions and 4 deletions
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24
AK/Utf16View.h
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@ -14,6 +14,8 @@
#include <AK/Optional.h> #include <AK/Optional.h>
#include <AK/Span.h> #include <AK/Span.h>
#include <AK/String.h> #include <AK/String.h>
#include <AK/StringHash.h>
#include <AK/Traits.h>
#include <AK/Types.h> #include <AK/Types.h>
#include <AK/UnicodeUtils.h> #include <AK/UnicodeUtils.h>
#include <AK/Vector.h> #include <AK/Vector.h>
@ -121,6 +123,13 @@ public:
return m_length_in_code_points; return m_length_in_code_points;
} }
u32 hash() const
{
if (is_empty())
return 0;
return string_hash(reinterpret_cast<char const*>(m_code_units.data()), m_code_units.size() * sizeof(u16));
}
Utf16CodePointIterator begin() const { return { begin_ptr(), m_code_units.size() }; } Utf16CodePointIterator begin() const { return { begin_ptr(), m_code_units.size() }; }
Utf16CodePointIterator end() const { return { end_ptr(), 0 }; } Utf16CodePointIterator end() const { return { end_ptr(), 0 }; }
@ -163,16 +172,23 @@ private:
mutable size_t m_length_in_code_points { NumericLimits<size_t>::max() }; mutable size_t m_length_in_code_points { NumericLimits<size_t>::max() };
}; };
}
template<> template<>
struct AK::Formatter<AK::Utf16View> : Formatter<FormatString> { struct Formatter<Utf16View> : Formatter<FormatString> {
ErrorOr<void> format(FormatBuilder& builder, AK::Utf16View const& value) ErrorOr<void> format(FormatBuilder& builder, Utf16View const& value)
{ {
return builder.builder().try_append(value); return builder.builder().try_append(value);
} }
}; };
template<>
struct Traits<Utf16View> : public DefaultTraits<Utf16View> {
using PeekType = Utf16View;
using ConstPeekType = Utf16View;
static unsigned hash(Utf16View const& s) { return s.hash(); }
};
}
#if USING_AK_GLOBALLY #if USING_AK_GLOBALLY
using AK::Utf16Data; using AK::Utf16Data;
using AK::Utf16View; using AK::Utf16View;