boost/program_options/errors.hpp
// Copyright Vladimir Prus 2002-2004. // Distributed under the Boost Software License, Version 1.0. // (See accompanying file LICENSE_1_0.txt // or copy at http://www.boost.org/LICENSE_1_0.txt) #ifndef BOOST_ERRORS_VP_2003_01_02 #define BOOST_ERRORS_VP_2003_01_02 #include <boost/program_options/config.hpp> #include <string> #include <stdexcept> #include <vector> #include <map> #if defined(BOOST_MSVC) # pragma warning (push) # pragma warning (disable:4275) // non dll-interface class 'std::logic_error' used as base for dll-interface class 'boost::program_options::error' # pragma warning (disable:4251) // class 'std::vector<_Ty>' needs to have dll-interface to be used by clients of class 'boost::program_options::ambiguous_option' #endif namespace boost { namespace program_options { inline std::string strip_prefixes(const std::string& text) { // "--foo-bar" -> "foo-bar" std::string::size_type i = text.find_first_not_of("-/"); if (i == std::string::npos) { return text; } else { return text.substr(i); } } /** Base class for all errors in the library. */ class BOOST_PROGRAM_OPTIONS_DECL error : public std::logic_error { public: error(const std::string& xwhat) : std::logic_error(xwhat) {} }; /** Class thrown when there are too many positional options. This is a programming error. */ class BOOST_PROGRAM_OPTIONS_DECL too_many_positional_options_error : public error { public: too_many_positional_options_error() : error("too many positional options have been specified on the command line") {} }; /** Class thrown when there are programming error related to style */ class BOOST_PROGRAM_OPTIONS_DECL invalid_command_line_style : public error { public: invalid_command_line_style(const std::string& msg) : error(msg) {} }; /** Class thrown if config file can not be read */ class BOOST_PROGRAM_OPTIONS_DECL reading_file : public error { public: reading_file(const char* filename) : error(std::string("can not read options configuration file '").append(filename).append("'")) {} }; /** Base class for most exceptions in the library. * * Substitutes the values for the parameter name * placeholders in the template to create the human * readable error message * * Placeholders are surrounded by % signs: %example% * Poor man's version of boost::format * * If a parameter name is absent, perform default substitutions * instead so ugly placeholders are never left in-place. * * Options are displayed in "canonical" form * This is the most unambiguous form of the * *parsed* option name and would correspond to * option_description::format_name() * i.e. what is shown by print_usage() * * The "canonical" form depends on whether the option is * specified in short or long form, using dashes or slashes * or without a prefix (from a configuration file) * * */ class BOOST_PROGRAM_OPTIONS_DECL error_with_option_name : public error { protected: /** can be * 0 = no prefix (config file options) * allow_long * allow_dash_for_short * allow_slash_for_short * allow_long_disguise */ int m_option_style; /** substitutions * from placeholders to values */ std::map<std::string, std::string> m_substitutions; typedef std::pair<std::string, std::string> string_pair; std::map<std::string, string_pair > m_substitution_defaults; public: /** template with placeholders */ std::string m_error_template; error_with_option_name(const std::string& template_, const std::string& option_name = "", const std::string& original_token = "", int option_style = 0); /** gcc says that throw specification on dtor is loosened * without this line * */ ~error_with_option_name() throw() {} //void dump() const //{ // std::cerr << "m_substitution_defaults:\n"; // for (std::map<std::string, string_pair>::const_iterator iter = m_substitution_defaults.begin(); // iter != m_substitution_defaults.end(); ++iter) // std::cerr << "\t" << iter->first << ":" << iter->second.first << "=" << iter->second.second << "\n"; // std::cerr << "m_substitutions:\n"; // for (std::map<std::string, std::string>::const_iterator iter = m_substitutions.begin(); // iter != m_substitutions.end(); ++iter) // std::cerr << "\t" << iter->first << "=" << iter->second << "\n"; // std::cerr << "m_error_template:\n"; // std::cerr << "\t" << m_error_template << "\n"; // std::cerr << "canonical_option_prefix:[" << get_canonical_option_prefix() << "]\n"; // std::cerr << "canonical_option_name:[" << get_canonical_option_name() <<"]\n"; // std::cerr << "what:[" << what() << "]\n"; //} /** Substitute * parameter_name->value to create the error message from * the error template */ void set_substitute(const std::string& parameter_name, const std::string& value) { m_substitutions[parameter_name] = value; } /** If the parameter is missing, then make the * from->to substitution instead */ void set_substitute_default(const std::string& parameter_name, const std::string& from, const std::string& to) { m_substitution_defaults[parameter_name] = std::make_pair(from, to); } /** Add context to an exception */ void add_context(const std::string& option_name, const std::string& original_token, int option_style) { set_option_name(option_name); set_original_token(original_token); set_prefix(option_style); } void set_prefix(int option_style) { m_option_style = option_style;} /** Overridden in error_with_no_option_name */ virtual void set_option_name(const std::string& option_name) { set_substitute("option", option_name);} std::string get_option_name() const { return get_canonical_option_name(); } void set_original_token(const std::string& original_token) { set_substitute("original_token", original_token);} /** Creates the error_message on the fly * Currently a thin wrapper for substitute_placeholders() */ virtual const char* what() const throw(); protected: /** Used to hold the error text returned by what() */ mutable std::string m_message; // For on-demand formatting in 'what' /** Makes all substitutions using the template */ virtual void substitute_placeholders(const std::string& error_template) const; // helper function for substitute_placeholders void replace_token(const std::string& from, const std::string& to) const; /** Construct option name in accordance with the appropriate * prefix style: i.e. long dash or short slash etc */ std::string get_canonical_option_name() const; std::string get_canonical_option_prefix() const; }; /** Class thrown when there are several option values, but user called a method which cannot return them all. */ class BOOST_PROGRAM_OPTIONS_DECL multiple_values : public error_with_option_name { public: multiple_values() : error_with_option_name("option '%canonical_option%' only takes a single argument"){} ~multiple_values() throw() {} }; /** Class thrown when there are several occurrences of an option, but user called a method which cannot return them all. */ class BOOST_PROGRAM_OPTIONS_DECL multiple_occurrences : public error_with_option_name { public: multiple_occurrences() : error_with_option_name("option '%canonical_option%' cannot be specified more than once"){} ~multiple_occurrences() throw() {} }; /** Class thrown when a required/mandatory option is missing */ class BOOST_PROGRAM_OPTIONS_DECL required_option : public error_with_option_name { public: // option name is constructed by the option_descriptor and never on the fly required_option(const std::string& option_name) : error_with_option_name("the option '%canonical_option%' is required but missing", "", option_name) { } ~required_option() throw() {} }; /** Base class of unparsable options, * when the desired option cannot be identified. * * * It makes no sense to have an option name, when we can't match an option to the * parameter * * Having this a part of the error_with_option_name hierachy makes error handling * a lot easier, even if the name indicates some sort of conceptual dissonance! * * */ class BOOST_PROGRAM_OPTIONS_DECL error_with_no_option_name : public error_with_option_name { public: error_with_no_option_name(const std::string& template_, const std::string& original_token = "") : error_with_option_name(template_, "", original_token) { } /** Does NOT set option name, because no option name makes sense */ virtual void set_option_name(const std::string&) {} ~error_with_no_option_name() throw() {} }; /** Class thrown when option name is not recognized. */ class BOOST_PROGRAM_OPTIONS_DECL unknown_option : public error_with_no_option_name { public: unknown_option(const std::string& original_token = "") : error_with_no_option_name("unrecognised option '%canonical_option%'", original_token) { } ~unknown_option() throw() {} }; /** Class thrown when there's ambiguity amoung several possible options. */ class BOOST_PROGRAM_OPTIONS_DECL ambiguous_option : public error_with_no_option_name { public: ambiguous_option(const std::vector<std::string>& xalternatives) : error_with_no_option_name("option '%canonical_option%' is ambiguous"), m_alternatives(xalternatives) {} ~ambiguous_option() throw() {} const std::vector<std::string>& alternatives() const throw() {return m_alternatives;} protected: /** Makes all substitutions using the template */ virtual void substitute_placeholders(const std::string& error_template) const; private: // TODO: copy ctor might throw std::vector<std::string> m_alternatives; }; /** Class thrown when there's syntax error either for command * line or config file options. See derived children for * concrete classes. */ class BOOST_PROGRAM_OPTIONS_DECL invalid_syntax : public error_with_option_name { public: enum kind_t { long_not_allowed = 30, long_adjacent_not_allowed, short_adjacent_not_allowed, empty_adjacent_parameter, missing_parameter, extra_parameter, unrecognized_line }; invalid_syntax(kind_t kind, const std::string& option_name = "", const std::string& original_token = "", int option_style = 0): error_with_option_name(get_template(kind), option_name, original_token, option_style), m_kind(kind) { } ~invalid_syntax() throw() {} kind_t kind() const {return m_kind;} /** Convenience functions for backwards compatibility */ virtual std::string tokens() const {return get_option_name(); } protected: /** Used to convert kind_t to a related error text */ std::string get_template(kind_t kind); kind_t m_kind; }; class BOOST_PROGRAM_OPTIONS_DECL invalid_config_file_syntax : public invalid_syntax { public: invalid_config_file_syntax(const std::string& invalid_line, kind_t kind): invalid_syntax(kind) { m_substitutions["invalid_line"] = invalid_line; } ~invalid_config_file_syntax() throw() {} /** Convenience functions for backwards compatibility */ virtual std::string tokens() const {return m_substitutions.find("invalid_line")->second; } }; /** Class thrown when there are syntax errors in given command line */ class BOOST_PROGRAM_OPTIONS_DECL invalid_command_line_syntax : public invalid_syntax { public: invalid_command_line_syntax(kind_t kind, const std::string& option_name = "", const std::string& original_token = "", int option_style = 0): invalid_syntax(kind, option_name, original_token, option_style) {} ~invalid_command_line_syntax() throw() {} }; /** Class thrown when value of option is incorrect. */ class BOOST_PROGRAM_OPTIONS_DECL validation_error : public error_with_option_name { public: enum kind_t { multiple_values_not_allowed = 30, at_least_one_value_required, invalid_bool_value, invalid_option_value, invalid_option }; public: validation_error(kind_t kind, const std::string& option_name = "", const std::string& original_token = "", int option_style = 0): error_with_option_name(get_template(kind), option_name, original_token, option_style) { } ~validation_error() throw() {} protected: /** Used to convert kind_t to a related error text */ std::string get_template(kind_t kind); kind_t m_kind; }; /** Class thrown if there is an invalid option value given */ class BOOST_PROGRAM_OPTIONS_DECL invalid_option_value : public validation_error { public: invalid_option_value(const std::string& value); #ifndef BOOST_NO_STD_WSTRING invalid_option_value(const std::wstring& value); #endif }; /** Class thrown if there is an invalid bool value given */ class BOOST_PROGRAM_OPTIONS_DECL invalid_bool_value : public validation_error { public: invalid_bool_value(const std::string& value); }; }} #if defined(BOOST_MSVC) # pragma warning (pop) #endif #endif