89 lines
1.7 KiB
C++
89 lines
1.7 KiB
C++
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//
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// Copyright (c) 2016-2019 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/url
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//
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#ifndef BOOST_URL_GRAMMAR_LITERAL_RULE_HPP
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#define BOOST_URL_GRAMMAR_LITERAL_RULE_HPP
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#include <boost/url/detail/config.hpp>
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#include <boost/url/error_types.hpp>
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#include <boost/core/detail/string_view.hpp>
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#include <cstdlib>
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namespace boost {
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namespace urls {
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namespace grammar {
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/** Match a string literal exactly
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If there is no more input, or if the
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end of the input is reached, and a prefix
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of the literal matches exactly, the error
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returned is @ref error::need_more.
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@par Value Type
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@code
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using value_type = core::string_view;
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@endcode
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@par Example
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Rules are used with the function @ref parse.
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@code
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system::result< core::string_view > rv = parse( "HTTP", literal_rule( "HTTP" ) );
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@endcode
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@see
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@ref delim_rule,
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@ref parse.
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*/
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#ifdef BOOST_URL_DOCS
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constexpr
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__implementation_defined__
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literal_rule( char const* s );
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#else
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class literal_rule
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{
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char const* s_ = nullptr;
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std::size_t n_ = 0;
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constexpr
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static
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std::size_t
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len(char const* s) noexcept
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{
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return *s
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? 1 + len(s + 1)
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: 0;
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}
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public:
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using value_type = core::string_view;
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constexpr
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explicit
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literal_rule(
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char const* s) noexcept
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: s_(s)
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, n_(len(s))
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{
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}
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BOOST_URL_DECL
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system::result<value_type>
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parse(
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char const*& it,
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char const* end) const noexcept;
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};
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#endif
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} // grammar
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} // urls
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} // boost
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#endif
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