libcruft-util/cruft/util/uri.cpp.rl

/*
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * Copyright 2015 Danny Robson <danny@nerdcruft.net>
 */

#include <cruft/util/uri.hpp>

#include <cruft/util/debug/assert.hpp>

#include <algorithm>
#include <iostream>

// We generate some really old style C code via ragel here, so we have to
// disable some noisy warnings (doubly so given -Werror)
#pragma GCC diagnostic ignored "-Wold-style-cast"

using cruft::uri;


///////////////////////////////////////////////////////////////////////////////
%%{
    machine impl;

    action trace { if (0) std::cerr << *p; }
    action success {__success = true; }
    action failure {__success = false; }

    action scheme_begin { starts[SCHEME] = p; }
    action scheme_end   { record_component (SCHEME); }

    action hier_begin { ; }
    action hier_end   { ; }

    action user_begin { starts[USER] = p; }
    action user_end   { record_component (USER); }

    action host_begin { starts[HOST] = p; }
    action host_end   { record_component (HOST); }

    action port_begin { starts[PORT] = p; }
    action port_end   { record_component (PORT); }

    action authority_begin { ; }
    action authority_end   { ; }

    action path_begin { starts[PATH] = p; }
    action path_end   { record_component (PATH); }

    action query_begin { starts[QUERY] = p; }
    action query_end   { record_component (QUERY); }

    action fragment_begin { starts[FRAGMENT] = p; }
    action fragment_end   { record_component (FRAGMENT); }

    action uri_begin {}
    action uri_end   {}

    include rfc3986 'rfc3986.rl';

    impl := URI >uri_begin %uri_end
    %success
    $!failure
    $trace;

    write data;
}%%


///////////////////////////////////////////////////////////////////////////////
#include <fmt/format.h>


//-----------------------------------------------------------------------------
void
cruft::uri::parse (void)
{
    char const *starts[NUM_COMPONENTS] = {};

    const char *str = m_value.data ();
    const char *p   = m_value.data ();
    const char *pe  = m_value.data () + m_value.size ();
    const char *eof = pe;

    m_offsets = {};
    auto record_component = [&] (int const idx) {
        // CHECK (m_offsets[idx].first  == 0);
        // CHECK (m_offsets[idx].second == 0);

        CHECK (starts[idx]);

        m_offsets[idx].first  = cruft::cast::narrow<int> (starts[idx] - str);
        m_offsets[idx].second = cruft::cast::narrow<int> (          p - str);
    };

    bool __success = false;

    int cs;

    %%write init;
    %%write exec;

    if constexpr (debug_enabled) {
        if (!m_value.empty ())
            CHECK (std::any_of (
                m_offsets.begin (),
                m_offsets.end   (),
                [] (auto const &i)
             {
                return !!i.second;
             }));
     }

    if (!__success)
        throw parse_error (fmt::format ("invalid uri '{}'", m_value));
}