forked from boostorg/beast
133 lines
2.8 KiB
C++
133 lines
2.8 KiB
C++
//
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// Copyright (c) 2016-2017 Vinnie Falco (vinnie dot falco at gmail dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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// Official repository: https://github.com/boostorg/beast
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//
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#ifndef BOOST_BEAST_STRING_HPP
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#define BOOST_BEAST_STRING_HPP
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#include <boost/beast/core/detail/config.hpp>
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#include <boost/version.hpp>
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#include <boost/utility/string_view.hpp>
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#include <algorithm>
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namespace boost {
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namespace beast {
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/// The type of string view used by the library
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using string_view = boost::string_view;
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/// The type of basic string view used by the library
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template<class CharT, class Traits>
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using basic_string_view =
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boost::basic_string_view<CharT, Traits>;
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namespace detail {
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inline
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char
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ascii_tolower(char c)
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{
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return ((static_cast<unsigned>(c) - 65U) < 26) ?
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c + 'a' - 'A' : c;
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}
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template<class = void>
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bool
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iequals(
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beast::string_view lhs,
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beast::string_view rhs)
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{
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auto n = lhs.size();
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if(rhs.size() != n)
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return false;
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auto p1 = lhs.data();
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auto p2 = rhs.data();
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char a, b;
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while(n--)
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{
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a = *p1++;
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b = *p2++;
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if(a != b)
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{
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// slow loop
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do
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{
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if(ascii_tolower(a) != ascii_tolower(b))
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return false;
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a = *p1++;
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b = *p2++;
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}
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while(n--);
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return true;
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}
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}
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return true;
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}
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} // detail
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/** Returns `true` if two strings are equal, using a case-insensitive comparison.
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The case-comparison operation is defined only for low-ASCII characters.
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@param lhs The string on the left side of the equality
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@param rhs The string on the right side of the equality
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*/
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inline
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bool
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iequals(
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beast::string_view lhs,
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beast::string_view rhs)
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{
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return detail::iequals(lhs, rhs);
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}
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/** A case-insensitive less predicate for strings.
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The case-comparison operation is defined only for low-ASCII characters.
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*/
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struct iless
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{
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bool
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operator()(
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string_view lhs,
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string_view rhs) const
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{
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using std::begin;
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using std::end;
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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 c1, char c2)
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{
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return detail::ascii_tolower(c1) < detail::ascii_tolower(c2);
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}
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);
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}
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};
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/** A case-insensitive equality predicate for strings.
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The case-comparison operation is defined only for low-ASCII characters.
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*/
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struct iequal
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{
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bool
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operator()(
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string_view lhs,
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string_view rhs) const
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{
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return iequals(lhs, rhs);
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}
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};
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} // beast
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} // boost
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#endif
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