57 lines
2.3 KiB
C++
57 lines
2.3 KiB
C++
/*
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open source routing machine
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Copyright (C) Dennis Luxen, others 2010
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU AFFERO General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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or see http://www.gnu.org/licenses/agpl.txt.
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Custom validators for use with boost::program_options.
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*/
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#include <boost/program_options.hpp>
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namespace boost {
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namespace program_options {
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// Class for reporting missing files
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class missing_file_error : public boost::program_options::invalid_option_value {
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public:
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missing_file_error(const std::string& path) : invalid_option_value(path), path(path) {};
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~missing_file_error() throw() {};
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const char* what() const throw() {
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std::string err = get_option_name() + " file not found: " + path;
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return err.c_str();
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};
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protected:
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std::string path;
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};
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}
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namespace filesystem {
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// Validator for boost::filesystem::path, that verifies that the file exists.
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// The validate() function must be defined in the same namespace as the target type,
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// (boost::filesystem::path in this case), otherwise it will not be called
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void validate(boost::any& v, const std::vector<std::string>& values, boost::filesystem::path*, int) {
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boost::program_options::validators::check_first_occurrence(v); // avoid previous assignments
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const std::string& input_string = boost::program_options::validators::get_single_string(values); // avoid multiple assignments
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if(boost::filesystem::is_regular_file(input_string)) {
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v = boost::any(boost::filesystem::path(input_string));
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} else {
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throw boost::program_options::missing_file_error(input_string);
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}
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}
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}
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}
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