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101 lines
2.8 KiB
C++
101 lines
2.8 KiB
C++
//------------------------------------------------------------------------------
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/*
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This file is part of Beast: https://github.com/vinniefalco/Beast
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Copyright 2013, Vinnie Falco <vinnie.falco@gmail.com>
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL , DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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//==============================================================================
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#ifndef BEAST_UTILITY_CI_CHAR_TRAITS_H_INCLUDED
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#define BEAST_UTILITY_CI_CHAR_TRAITS_H_INCLUDED
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#include <beast/cxx14/algorithm.h> // <algorithm>
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#include <beast/cxx14/type_traits.h> // <type_traits>
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#include <cctype>
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#include <iterator>
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#include <string>
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#include <utility>
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namespace beast {
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/** Case-insensitive function object for performing less than comparisons. */
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struct ci_less
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{
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static bool const is_transparent = true;
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template <class String>
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bool
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operator() (String const& lhs, String const& rhs) const
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{
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using std::begin;
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using std::end;
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using char_type = typename String::value_type;
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return std::lexicographical_compare (
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begin(lhs), end(lhs), begin(rhs), end(rhs),
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[] (char_type lhs, char_type rhs)
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{
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return std::tolower(lhs) < std::tolower(rhs);
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}
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);
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}
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};
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namespace detail {
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inline
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bool
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ci_equal(std::pair<const char*, std::size_t> lhs,
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std::pair<const char*, std::size_t> rhs)
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{
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return std::equal (lhs.first, lhs.first + lhs.second,
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rhs.first, rhs.first + rhs.second,
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[] (char lhs, char rhs)
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{
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return std::tolower(lhs) == std::tolower(rhs);
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}
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);
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}
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template <size_t N>
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inline
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std::pair<const char*, std::size_t>
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view(const char (&s)[N])
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{
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return {s, N-1};
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}
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inline
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std::pair<const char*, std::size_t>
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view(std::string const& s)
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{
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return {s.data(), s.size()};
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}
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}
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/** Returns `true` if strings are case-insensitive equal. */
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template <class String1, class String2>
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inline
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bool
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ci_equal(String1 const& lhs, String2 const& rhs)
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{
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using detail::view;
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using detail::ci_equal;
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return ci_equal(view(lhs), view(rhs));
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}
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}
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#endif
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