Peter M. Groen / CLI11

#pragma once

// Distributed under the 3-Clause BSD License.  See accompanying
// file LICENSE or https://github.com/CLIUtils/CLI11 for details.

#include <exception>
#include <stdexcept>
#include <string>

namespace CLI {

/// These codes are part of every error in CLI. They can be obtained from e using e.exit_code or as a quick shortcut,
/// int values from e.get_error_code().
enum class ExitCodes {
    Success = 0,
    IncorrectConstruction = 100,
    BadNameString,
    OptionAlreadyAdded,
    File,
    Conversion,
    Validation,
    Required,
    Requires,
    Excludes,
    Extras,
    ExtrasINI,
    Invalid,
    Horrible,
    OptionNotFound,
    BaseClass = 127
};

// Error definitions

/// @defgroup error_group Errors
/// @brief Errors thrown by CLI11
///
/// These are the errors that can be thrown. Some of them, like CLI::Success, are not really errors.
/// @{

/// All errors derive from this one
struct Error : public std::runtime_error {
    int exit_code;
    int get_exit_code() const { return exit_code; }

    Error(std::string parent, std::string name, ExitCodes exit_code = ExitCodes::BaseClass)
        : runtime_error(parent + ": " + name), exit_code(static_cast<int>(exit_code)) {}
    Error(std::string parent, std::string name, int exit_code = static_cast<int>(ExitCodes::BaseClass))
        : runtime_error(parent + ": " + name), exit_code(exit_code) {}
};

/// Construction errors (not in parsing)
struct ConstructionError : public Error {
    // Using Error::Error constructors seem to not work on GCC 4.7
    ConstructionError(std::string parent, std::string name, ExitCodes exit_code = ExitCodes::BaseClass)
        : Error(parent, name, exit_code) {}
};

/// Thrown when an option is set to conflicting values (non-vector and multi args, for example)
struct IncorrectConstruction : public ConstructionError {
    IncorrectConstruction(std::string name)
        : ConstructionError("IncorrectConstruction", name, ExitCodes::IncorrectConstruction) {}
};

/// Thrown on construction of a bad name
struct BadNameString : public ConstructionError {
    BadNameString(std::string name) : ConstructionError("BadNameString", name, ExitCodes::BadNameString) {}
};

/// Thrown when an option already exists
struct OptionAlreadyAdded : public ConstructionError {
    OptionAlreadyAdded(std::string name)
        : ConstructionError("OptionAlreadyAdded", name, ExitCodes::OptionAlreadyAdded) {}
};

// Parsing errors

/// Anything that can error in Parse
struct ParseError : public Error {
    ParseError(std::string parent, std::string name, ExitCodes exit_code = ExitCodes::BaseClass)
        : Error(parent, name, exit_code) {}
    ParseError(std::string parent, std::string name, int exit_code = static_cast<int>(ExitCodes::BaseClass))
        : Error(parent, name, exit_code) {}
};

// Not really "errors"

/// This is a successful completion on parsing, supposed to exit
struct Success : public ParseError {
    Success() : ParseError("Success", "Successfully completed, should be caught and quit", ExitCodes::Success) {}
};

/// -h or --help on command line
struct CallForHelp : public ParseError {
    CallForHelp()
        : ParseError("CallForHelp", "This should be caught in your main function, see examples", ExitCodes::Success) {}
};

/// Does not output a diagnostic in CLI11_PARSE, but allows to return from main() with a specific error code.
struct RuntimeError : public ParseError {
    RuntimeError(int exit_code = 1) : ParseError("RuntimeError", "runtime error", exit_code) {}
};

/// Thrown when parsing an INI file and it is missing
struct FileError : public ParseError {
    FileError(std::string name) : ParseError("FileError", name, ExitCodes::File) {}
};

/// Thrown when conversion call back fails, such as when an int fails to coerce to a string
struct ConversionError : public ParseError {
    ConversionError(std::string name) : ParseError("ConversionError", name, ExitCodes::Conversion) {}
};

/// Thrown when validation of results fails
struct ValidationError : public ParseError {
    ValidationError(std::string name) : ParseError("ValidationError", name, ExitCodes::Validation) {}
};

/// Thrown when a required option is missing
struct RequiredError : public ParseError {
    RequiredError(std::string name) : ParseError("RequiredError", name, ExitCodes::Required) {}
};

/// Thrown when a requires option is missing
struct RequiresError : public ParseError {
    RequiresError(std::string name, std::string subname)
        : ParseError("RequiresError", name + " requires " + subname, ExitCodes::Requires) {}
};

/// Thrown when a exludes option is present
struct ExcludesError : public ParseError {
    ExcludesError(std::string name, std::string subname)
        : ParseError("ExcludesError", name + " excludes " + subname, ExitCodes::Excludes) {}
};

/// Thrown when too many positionals or options are found
struct ExtrasError : public ParseError {
    ExtrasError(std::string name) : ParseError("ExtrasError", name, ExitCodes::Extras) {}
};

/// Thrown when extra values are found in an INI file
struct ExtrasINIError : public ParseError {
    ExtrasINIError(std::string name) : ParseError("ExtrasINIError", name, ExitCodes::ExtrasINI) {}
};

/// Thrown when validation fails before parsing
struct InvalidError : public ParseError {
    InvalidError(std::string name) : ParseError("InvalidError", name, ExitCodes::Invalid) {}
};

/// This is just a safety check to verify selection and parsing match
struct HorribleError : public ParseError {
    HorribleError(std::string name)
        : ParseError("HorribleError", "(You should never see this error) " + name, ExitCodes::Horrible) {}
};

// After parsing

/// Thrown when counting a non-existent option
struct OptionNotFound : public Error {
    OptionNotFound(std::string name) : Error("OptionNotFound", name, ExitCodes::OptionNotFound) {}
};

/// @}

} // namespace CLI