109 lines
2.1 KiB
C++
109 lines
2.1 KiB
C++
//
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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/http_proto
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//
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#ifndef BOOST_URL_GRAMMAR_TOKEN_RULE_HPP
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#define BOOST_URL_GRAMMAR_TOKEN_RULE_HPP
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#include <boost/url/detail/config.hpp>
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#include <boost/url/grammar/charset.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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namespace boost {
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namespace urls {
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namespace grammar {
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/** Match a non-empty string of characters from a set
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If there is no more input, the error code
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@ref error::need_more is returned.
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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( "abcdef", token_rule( alpha_chars ) );
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@endcode
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@par BNF
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@code
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token = 1*( ch )
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@endcode
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@param cs The character set to use
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@see
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@ref alpha_chars,
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@ref parse.
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*/
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#ifdef BOOST_URL_DOCS
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template<class CharSet>
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constexpr
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__implementation_defined__
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token_rule(
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CharSet cs) noexcept;
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#else
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template<class CharSet>
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struct token_rule_t
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{
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using value_type = core::string_view;
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static_assert(
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is_charset<CharSet>::value,
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"CharSet requirements not met");
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auto
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parse(
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char const*& it,
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char const* end
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) const noexcept ->
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system::result<value_type>;
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private:
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template<class CharSet_>
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friend
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constexpr
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auto
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token_rule(
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CharSet_ const&) noexcept ->
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token_rule_t<CharSet_>;
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constexpr
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token_rule_t(
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CharSet const& cs) noexcept
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: cs_(cs)
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{
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}
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CharSet const cs_;
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};
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template<class CharSet>
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constexpr
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auto
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token_rule(
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CharSet const& cs) noexcept ->
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token_rule_t<CharSet>
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{
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return {cs};
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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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#include <boost/url/grammar/impl/token_rule.hpp>
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#endif
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