anonymous_namespace{main.cpp}::options Class Reference

Public Member Functions
	options (const std::vector< std::string > &arguments, const std::size_t first, const std::initializer_list< std::string_view > allowed, const std::initializer_list< std::string_view > flags={})
const std::string &	require (const std::string_view name) const
std::optional< std::string >	optional (const std::string_view name) const
bool	flag (const std::string_view name) const
	options (const std::vector< std::string > &arguments, const std::size_t first, const std::initializer_list< std::string_view > allowed, const std::initializer_list< std::string_view > flags={})
const std::string &	require (const std::string_view name) const
std::optional< std::string >	optional (const std::string_view name) const
bool	flag (const std::string_view name) const

Private Attributes
std::map< std::string, std::string, std::less<> >	values_
std::set< std::string, std::less<> >	present_flags_

Detailed Description

Definition at line 185 of file main.cpp.

Constructor & Destructor Documentation

options() [1/2]

anonymous_namespace{main.cpp}::options::options ( const std::vector< std::string > & arguments, const std::size_t first, const std::initializer_list< std::string_view > allowed, const std::initializer_list< std::string_view > flags = {} )

inline

Definition at line 187 of file main.cpp.

                                                          {}
    ) {
        std::set<std::string, std::less<>> allowed_values;
        std::set<std::string, std::less<>> allowed_flags;
        for (const auto value : allowed) {
            allowed_values.emplace(value);
        }
        for (const auto value : flags) {
            allowed_flags.emplace(value);
        }
        for (std::size_t index = first; index < arguments.size();) {
            const std::string& name = arguments[index];
            if (!name.starts_with("--")) {
                throw cli_error("unexpected positional argument: " + name);
            }
            if (values_.contains(name) || present_flags_.contains(name)) {
                throw cli_error("duplicate option: " + name);
            }
            if (allowed_flags.contains(name)) {
                present_flags_.emplace(name);
                ++index;
                continue;
            }
            if (!allowed_values.contains(name)) {
                throw cli_error("unknown option: " + name);
            }
            if (index + 1U >= arguments.size()
                || arguments[index + 1U].starts_with("--")) {
                throw cli_error("option requires a value: " + name);
            }
            values_.emplace(name, arguments[index + 1U]);
            index += 2U;
        }
    }

options() [2/2]

anonymous_namespace{main.cpp}::options::options ( const std::vector< std::string > & arguments, const std::size_t first, const std::initializer_list< std::string_view > allowed, const std::initializer_list< std::string_view > flags = {} )

inline

Definition at line 187 of file main.cpp.

                                                          {}
    ) {
        std::set<std::string, std::less<>> allowed_values;
        std::set<std::string, std::less<>> allowed_flags;
        for (const auto value : allowed) {
            allowed_values.emplace(value);
        }
        for (const auto value : flags) {
            allowed_flags.emplace(value);
        }
        for (std::size_t index = first; index < arguments.size();) {
            const std::string& name = arguments[index];
            if (!name.starts_with("--")) {
                throw cli_error("unexpected positional argument: " + name);
            }
            if (values_.contains(name) || present_flags_.contains(name)) {
                throw cli_error("duplicate option: " + name);
            }
            if (allowed_flags.contains(name)) {
                present_flags_.emplace(name);
                ++index;
                continue;
            }
            if (!allowed_values.contains(name)) {
                throw cli_error("unknown option: " + name);
            }
            if (index + 1U >= arguments.size()
                || arguments[index + 1U].starts_with("--")) {
                throw cli_error("option requires a value: " + name);
            }
            values_.emplace(name, arguments[index + 1U]);
            index += 2U;
        }
    }

Member Function Documentation

flag() [1/2]

bool anonymous_namespace{main.cpp}::options::flag ( const std::string_view name ) const

inlinenodiscard

Definition at line 243 of file main.cpp.

                                                             {
        return present_flags_.contains(name);
    }

flag() [2/2]

bool anonymous_namespace{main.cpp}::options::flag ( const std::string_view name ) const

inlinenodiscard

Definition at line 243 of file main.cpp.

                                                             {
        return present_flags_.contains(name);
    }

optional() [1/2]

std::optional< std::string > anonymous_namespace{main.cpp}::options::optional ( const std::string_view name ) const

inlinenodiscard

Definition at line 235 of file main.cpp.

                                              {
        const auto value = values_.find(name);
        if (value == values_.end()) {
            return std::nullopt;
        }
        return value->second;
    }

optional() [2/2]

std::optional< std::string > anonymous_namespace{main.cpp}::options::optional ( const std::string_view name ) const

inlinenodiscard

Definition at line 235 of file main.cpp.

                                              {
        const auto value = values_.find(name);
        if (value == values_.end()) {
            return std::nullopt;
        }
        return value->second;
    }

require() [1/2]

const std::string & anonymous_namespace{main.cpp}::options::require ( const std::string_view name ) const

inlinenodiscard

Definition at line 226 of file main.cpp.

                                             {
        const auto value = values_.find(name);
        if (value == values_.end() || value->second.empty()) {
            throw cli_error("required option is missing: " + std::string(name));
        }
        return value->second;
    }

require() [2/2]

const std::string & anonymous_namespace{main.cpp}::options::require ( const std::string_view name ) const

inlinenodiscard

Definition at line 226 of file main.cpp.

                                             {
        const auto value = values_.find(name);
        if (value == values_.end() || value->second.empty()) {
            throw cli_error("required option is missing: " + std::string(name));
        }
        return value->second;
    }

Member Data Documentation

present_flags_

std::set< std::string, std::less<> > anonymous_namespace{main.cpp}::options::present_flags_

private

Definition at line 249 of file main.cpp.

values_

std::map< std::string, std::string, std::less<> > anonymous_namespace{main.cpp}::options::values_

private

Definition at line 248 of file main.cpp.

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The documentation for this class was generated from the following file:

• main.cpp