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Rework StringOps::substr implementation

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Avoid iterating over the whole string when the length is not provided
just use the end iterator directly.
This commit is contained in:
Maxime Coste 2022-12-03 08:24:38 +11:00
parent cd73f2aa17
commit 78c44e94dc
1 changed files with 6 additions and 12 deletions
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18
src/string.hh
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@ -82,9 +82,9 @@ public:
ColumnCount column_count_to(ByteCount count) const
{ return utf8::column_distance(begin(), begin() + (int)count); }
StringView substr(ByteCount from, ByteCount length = INT_MAX) const;
StringView substr(CharCount from, CharCount length = INT_MAX) const;
StringView substr(ColumnCount from, ColumnCount length = INT_MAX) const;
StringView substr(ByteCount from, ByteCount length = -1) const;
StringView substr(CharCount from, CharCount length = -1) const;
StringView substr(ColumnCount from, ColumnCount length = -1) const;
private:
[[gnu::always_inline]]
@ -284,29 +284,23 @@ inline String String::no_copy(StringView str) { return {NoCopy{}, str}; }
template<typename Type, typename CharType>
inline StringView StringOps<Type, CharType>::substr(ByteCount from, ByteCount length) const
{
if (length < 0)
length = INT_MAX;
const auto str_len = type().length();
kak_assert(from >= 0 and from <= str_len);
return StringView{ type().data() + (int)from, std::min(str_len - from, length) };
return StringView{type().data() + (int)from, std::min(str_len - from, length >= 0 ? length : str_len)};
}
template<typename Type, typename CharType>
inline StringView StringOps<Type, CharType>::substr(CharCount from, CharCount length) const
{
if (length < 0)
length = INT_MAX;
auto beg = utf8::advance(begin(), end(), from);
return StringView{ beg, utf8::advance(beg, end(), length) };
return StringView{beg, length >= 0 ? utf8::advance(beg, end(), length) : end()};
}
template<typename Type, typename CharType>
inline StringView StringOps<Type, CharType>::substr(ColumnCount from, ColumnCount length) const
{
if (length < 0)
length = INT_MAX;
auto beg = utf8::advance(begin(), end(), from);
return StringView{ beg, utf8::advance(beg, end(), length) };
return StringView{beg, (length >= 0) ? utf8::advance(beg, end(), length) : end()};
}
template<typename Type, typename CharType>