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string: add trim

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Signed-off-by: Simon Rozman <simon@rozman.si>
This commit is contained in:
Simon Rozman 2023-10-01 23:21:32 +02:00
parent 82a16ef579
commit 838dfabbda
1 changed files with 132 additions and 0 deletions
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132
include/stdex/string.hpp
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@ -1475,4 +1475,136 @@ namespace stdex
for (size_t i = 0; i < str.size(); ++i) for (size_t i = 0; i < str.size(); ++i)
str[i] = ctype.toupper(str[i]); str[i] = ctype.toupper(str[i]);
} }
///
/// Trim whitespace from string start
///
/// \param[in] str String to trim
/// \param[in] count Code unit limit
///
/// \return Number of code units excluding zero terminator in the string after the operation.
///
template<class T>
inline size_t ltrim(
_Inout_z_count_(count) T* str, _In_ size_t count,
_In_ const std::locale& locale)
{
const auto& ctype = std::use_facet<std::ctype<T>>(locale);
for (size_t i = 0;; ++i) {
if (i >= count) {
if (count) str[0] = 0;
return 0;
}
if (!str[i]) {
str[0] = 0;
return 0;
}
if (!ctype.is(ctype.space, str[i])) {
if (!i)
return strnlen(str, count);
size_t n = count != SIZE_MAX ? strncpy(str, str + i, count - i) : strcpy(str, str + i);
str[n] = 0;
return n;
}
}
}
///
/// Trim whitespace from string start
///
/// \param[in,out] s String to trim
///
template<class _Elem, class _Traits = std::char_traits<_Elem>, class _Ax = std::allocator<_Elem>>
inline void ltrim(_Inout_ std::basic_string<_Elem, _Traits, _Ax> &s, _In_ const std::locale& locale)
{
const auto& ctype = std::use_facet<std::ctype<_Elem>>(locale);
s.erase(
s.begin(),
std::find_if(
s.begin(),
s.end(),
[&](_Elem ch) { return !ctype.is(ctype.space, ch); }));
}
///
/// Trim whitespace from string end
///
/// \param[in] str String to trim
/// \param[in] count Code unit limit
///
/// \return Number of code units excluding zero terminator in the string after the operation.
///
template<class T>
inline size_t rtrim(
_Inout_z_count_(count) T* str, _In_ size_t count,
_In_ const std::locale& locale)
{
const auto& ctype = std::use_facet<std::ctype<T>>(locale);
for (size_t i = 0, j = 0;;) {
if (i >= count || !str[i]) {
if (j < count) str[j] = 0;
return j;
}
if (!ctype.is(ctype.space, str[i]))
j = ++i;
else
++i;
}
}
///
/// Trim whitespace from string end
///
/// \param[in,out] s String to trim
///
template<class _Elem, class _Traits = std::char_traits<_Elem>, class _Ax = std::allocator<_Elem>>
static inline void rtrim(_Inout_ std::basic_string<_Elem, _Traits, _Ax> &s, _In_ const std::locale& locale)
{
const auto& ctype = std::use_facet<std::ctype<_Elem>>(locale);
s.erase(
std::find_if(
s.rbegin(),
s.rend(),
[&](_Elem ch) { return !ctype.is(ctype.space, ch); }).base(),
s.end());
}
///
/// Trim whitespace from string start and end
///
/// \param[in] str String to trim
/// \param[in] count Code unit limit
///
/// \return Number of code units excluding zero terminator in the string after the operation.
///
template<class T>
inline size_t trim(
_Inout_z_count_(count) T* str, _In_ size_t count,
_In_ const std::locale& locale)
{
return ltrim(str, rtrim(str, count, locale), locale);
}
///
/// Trim whitespace from string start and end
///
/// \param[in,out] s String to trim
///
template<class _Elem, class _Traits = std::char_traits<_Elem>, class _Ax = std::allocator<_Elem>>
static inline void trim(_Inout_ std::basic_string<_Elem, _Traits, _Ax> &s, _In_ const std::locale& locale)
{
const auto& ctype = std::use_facet<std::ctype<_Elem>>(locale);
s.erase(
s.begin(),
std::find_if(
s.begin(),
s.end(),
[&](_Elem ch) { return !ctype.is(ctype.space, ch); }));
s.erase(
std::find_if(
s.rbegin(),
s.rend(),
[&](_Elem ch) { return !ctype.is(ctype.space, ch); }).base(),
s.end());
}
} }