validator_regex.cpp

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// Copyright (c) 2006-2025  Made to Order Software Corp.  All Rights Reserved
//
// https://snapwebsites.org/project/advgetopt
// contact@m2osw.com
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 
// self
//
#include    "advgetopt/validator_regex.h"
 
 
// cppthread
//
#include    <cppthread/log.h>
 
 
// last include
//
#include    <snapdev/poison.h>
 
 
 
 
namespace advgetopt
{
 
 
 
namespace
{
 
 
 
class validator_regex_factory
    : public validator_factory
{
public:
    validator_regex_factory()
    {
        validator::register_validator(*this);
    }
 
    virtual std::string get_name() const override
    {
        return std::string("regex");
    }
 
    virtual std::shared_ptr<validator> create(string_list_t const & data) const override
    {
        return std::make_shared<validator_regex>(data);
    }
};
 
validator_regex_factory         g_validator_regex_factory;
 
 
 
} // no name namespace
 
 
 
 
 
validator_regex::validator_regex(string_list_t const & regex_list)
{
    if(regex_list.size() > 1)
    {
        cppthread::log << cppthread::log_level_t::error
                       << "validator_regex() only supports one parameter; "
                       << regex_list.size()
                       << " were supplied; single or double quotation may be required?"
                       << cppthread::end;
        return;
    }
 
    std::string regex;
    if(!regex_list.empty())
    {
        regex = regex_list[0];
    }
    std::regex::flag_type flags =  std::regex_constants::extended;
    if(regex.length() >= 2
    && regex[0] == '/')
    {
        auto it(regex.end());
        for(--it; it != regex.begin(); --it)
        {
            if(*it == '/')
            {
                break;
            }
            switch(*it)
            {
            case 'i':
                flags |= std::regex_constants::icase;
                break;
 
            default:
                cppthread::log << cppthread::log_level_t::error
                               << "unsupported regex flag "
                               << *it
                               << " in regular expression \""
                               << regex
                               << "\"."
                               << cppthread::end;
                break;
 
            }
        }
        if(it == regex.begin())
        {
            cppthread::log << cppthread::log_level_t::error
                           << "invalid regex definition, ending / is missing in \""
                           << regex
                           << "\"."
                           << cppthread::end;
 
            f_regex = std::regex(std::string(regex.begin() + 1, regex.end()), flags);
        }
        else
        {
            f_regex = std::regex(std::string(regex.begin() + 1, it), flags);
        }
    }
    else
    {
        f_regex = std::regex(regex, flags);
    }
}
 
 
std::string validator_regex::name() const
{
    return std::string("regex");
}
 
 
bool validator_regex::validate(std::string const & value) const
{
    std::smatch info;
    return std::regex_match(value, info, f_regex);
}
 
 
 
} // namespace advgetopt
// vim: ts=4 sw=4 et