Public Member Functions
	Environment (const Environment &)=default

	Environment (Environment &&)=default

Environment &	operator= (const Environment &)=default

Environment &	operator= (Environment &&)=default

	Environment (std::initializer_list< std::pair< std::string const, std::string >> init)

	Environment (const std::map< std::string, std::string > &defines)

	Environment (std::map< std::string, std::string > &&defines)

bool	prefer_external () const

void	prefer_external (bool value)

bool	allow_undefined () const

void	allow_undefined (bool value)

void	insert (const std::string &key, const std::string &value)

void	set (const std::string &key, const std::string &value)

std::optional< std::string >	get (const std::string &key) const

std::optional< std::string >	get (const std::string &key, bool prefer_external) const

std::string	get_or (const std::string &key, const std::string &alternative) const

std::string	get_or (const std::string &key, const std::string &alternative, bool prefer_external) const

std::string	require (const std::string &key) const

std::string	require (const std::string &key, bool prefer_external) const

std::string	evaluate (const std::string &s) const

std::string	evaluate (const std::string &s, bool prefer_external, bool allow_undefined) const

std::string	interpolate (const std::string &s) const

std::string	interpolate (const std::string &s, bool prefer_external, bool allow_undefined) const

Member Function Documentation

◆ evaluate()

std::string fable::Environment::evaluate ( const std::string & s ) const

inline

Evaluate a single variable, such as "KEY" or "KEY-ALTERNATIVE".

Throws std::out_of_range if allow_undefined() is false and std::invalid_argument if a malformed string is supplied.

std::optional<std::string> fable::Environment::get ( const std::string & key ) const

inline

Return the value of a literal key, trying both environment and internal defines, depending on the value of perfer_external().

If neither are defined, "" is returned when allow_undefined() is true, and a std::out_of_range error is thrown.

This is roughly equivalent to ${KEY}.

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std::string fable::Environment::get_or	(	const std::string &	key,
		const std::string &	alternative
	)		const

inline

Return the value of a literal key, trying both environment and internal defines, depending on the value of perfer_external().

If neither are defined, alternative is returned.

This is equivalent to ${KEY-ALTERNATIVE}, and cannot fail.

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std::string fable::Environment::interpolate ( const std::string & s ) const

inline

Interpolate a string will evaluate all variable instances in a string.

Throws std::out_of_range if allow_undefined() is false and std::invalid_argument if a malformed string is supplied.

std::string fable::Environment::require ( const std::string & key ) const

inline

Return the value of a literal key, trying both environment and internal defines, depending on the value of perfer_external().

If neither are defined, a std::out_of_range error is thrown.

This is roughly equivalent to ${KEY?out_of_range}.

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

/home/docs/checkouts/readthedocs.org/user_builds/cloe/checkouts/latest/fable/include/fable/environment.hpp
/home/docs/checkouts/readthedocs.org/user_builds/cloe/checkouts/latest/fable/src/fable/environment.cpp