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AK: Implement all comparison operators for StringView

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Daniel Bertalan 2022-01-29 15:49:33 +01:00 committed by Andreas Kling
parent 2e5a9b4fab
commit ca58c71faa
2 changed files with 24 additions and 23 deletions
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10
AK/StringView.cpp
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@ -203,15 +203,7 @@ template Optional<long long> StringView::to_uint() const;
bool StringView::operator==(const String& string) const
{
if (string.is_null())
return !m_characters;
if (!m_characters)
return false;
if (m_length != string.length())
return false;
if (m_characters == string.characters())
return true;
return !__builtin_memcmp(m_characters, string.characters(), m_length);
return *this == string.view();
}
String StringView::to_string() const { return String { *this }; }

37
AK/StringView.h
View file

@ -204,28 +204,37 @@ public:
bool operator==(const String&) const;
[[nodiscard]] constexpr int compare(StringView other) const
{
size_t rlen = min(length(), other.length());
int c = (rlen != 0) ? __builtin_memcmp(m_characters, other.m_characters, rlen) : 0;
if (c == 0) {
if (length() < other.length())
return -1;
if (length() == other.length())
return 0;
return 1;
}
return c;
}
constexpr bool operator==(StringView other) const
{
if (is_null())
return other.is_null();
if (other.is_null())
return false;
if (length() != other.length())
return false;
return __builtin_memcmp(m_characters, other.m_characters, m_length) == 0;
return length() == other.length() && compare(other) == 0;
}
constexpr bool operator!=(StringView other) const
{
return !(*this == other);
return length() != other.length() || compare(other) != 0;
}
bool operator<(StringView other) const
{
if (int c = __builtin_memcmp(m_characters, other.m_characters, min(m_length, other.m_length)))
return c < 0;
return m_length < other.m_length;
}
constexpr bool operator<(StringView other) const { return compare(other) < 0; }
constexpr bool operator<=(StringView other) const { return compare(other) <= 0; }
constexpr bool operator>(StringView other) const { return compare(other) > 0; }
constexpr bool operator>=(StringView other) const { return compare(other) >= 0; }
[[nodiscard]] String to_string() const;