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// Copyright (c) 2019 Vinnie Falco (vinnie.falco@gmail.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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#include <boost/url/detail/config.hpp>
 
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#include <boost/url/grammar/error.hpp>
 
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#include <boost/url/grammar/literal_rule.hpp>
 
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#include <boost/assert.hpp>
 
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#include <cstring>
 
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namespace boost {
 
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namespace urls {
 
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namespace grammar {
 
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auto
 
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literal_rule::
 
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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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        system::result<value_type>
 
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{
 
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    // Can't have a literal
 
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    // with an empty string!
 
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    BOOST_ASSERT(n_ > 0);
 
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    std::size_t n = end - it;
 
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    if(n >= n_)
 
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    {
 
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        if(std::memcmp(
 
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            it, s_, n_) != 0)
 
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        {
 
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            // non-match
 
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            BOOST_URL_RETURN_EC(
 
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                error::mismatch);
 
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        }
 
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        it += n_;
 
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        return core::string_view(
 
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            it - n_, it);
 
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    }
 
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    if(n > 0)
 
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    {
 
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        // short input
 
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        if(std::memcmp(
 
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            it, s_, n) != 0)
 
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        {
 
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            // non-match
 
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            BOOST_URL_RETURN_EC(
 
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                error::mismatch);
 
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        }
 
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        // prefix matches
 
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        BOOST_URL_RETURN_EC(
 
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            error::need_more);
 
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    }
 
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    // end
 
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    BOOST_URL_RETURN_EC(
 
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        error::need_more);
 
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}
 
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} // grammar
 
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} // urls
 
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} // boost
 
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