rego::BuiltInsDef Class Reference

Manages the set of builtins used by an interpreter to resolve built-in calls. More...

#include <rego.hh>

Public Member Functions
	BuiltInsDef () noexcept
	Constructor.
bool	is_builtin (const Location &name)
	Determines whether the provided name refers to a built-in.
Node	decl (const Location &name)
	Gets the declaration node for the specified built-in.
bool	is_deprecated (const Location &version, const Location &name) const
	Determines whether the provided builtin name is deprecated in the provided version.
Node	call (const Location &name, const Location &version, const Nodes &args)
	Calls the built-in with the provided name and arguments.
void	clear ()
	Called to clear any persistent state or caching.
BuiltInsDef &	register_builtin (const BuiltIn &built_in)
	Registers a built-in.
BuiltIn	at (const Location &name)
	Gets the built-in with the provided name.
bool	strict_errors () const
	Whether to throw built-in errors.
BuiltInsDef &	strict_errors (bool strict_errors)
	Sets whether to throw built-in errors.
template<typename T >
BuiltInsDef &	register_builtins (const T &built_ins)
	Registers a set of built-ins.
BuiltInsDef &	register_standard_builtins ()
	This method no longer needs to be called.
template<typename T >
BuiltInsDef &	whitelist (const std::initializer_list< T > &allowed)
	Sets a whitelist of built-in names that are allowed to be loaded.
template<typename T >
BuiltInsDef &	whitelist (T begin, T end)
	Sets a whitelist of built-in names that are allowed to be loaded.
template<typename T >
BuiltInsDef &	blacklist (const std::initializer_list< T > &forbidden)
	Sets a blacklist of built-in names that are forbidden from being loaded.
template<typename T >
BuiltInsDef &	blacklist (T begin, T end)
	Sets a blacklist of built-in names that are forbidden from being loaded.
BuiltInsDef &	allow_all ()
	Allow all built-ins to be loaded from the standard library.

Static Public Member Functions
static std::shared_ptr< BuiltInsDef >	create ()
	Creates the standard builtin set.

Detailed Description

Manages the set of builtins used by an interpreter to resolve built-in calls.

This object provides all lookup for builtins. Users can add their own custom builtins using BuiltInsDef::register_builtin. Built-ins from the Rego standard library.) will be loaded as needed. Control over what parts of the standard library are available to policies is available via the BuiltInsDef::whitelist and BuiltInsDef::blacklist methods.

Member Function Documentation

allow_all()

BuiltInsDef & rego::BuiltInsDef::allow_all

(

)

Allow all built-ins to be loaded from the standard library.

Returns

A reference to this instance

at()

BuiltIn rego::BuiltInsDef::at

(

const Location &

name

)

Gets the built-in with the provided name.

Parameters

name	The name of the built-in to retrieve.

Returns

The built-in with the specified name.

blacklist() [1/2]

template<typename T >

BuiltInsDef & rego::BuiltInsDef::blacklist ( const std::initializer_list< T > & forbidden )

inline

Sets a blacklist of built-in names that are forbidden from being loaded.

Built-ins whose names are in this list will be forbidden. Any previous list and behavior will be overridden.

Parameters

forbidden

the forbidden built-in names

Returns

A reference to this instance

blacklist() [2/2]

template<typename T >

BuiltInsDef & rego::BuiltInsDef::blacklist ( T begin, T end )

inline

Sets a blacklist of built-in names that are forbidden from being loaded.

Built-ins whose names are in this list will be forbidden. Any previous list and behavior will be overridden.

Parameters

begin	iterator pointing to the beginning of a range of forbidden names
end	iterator pointing to the end of a range of forbidden names

Returns

A reference to this instance

call()

Node rego::BuiltInsDef::call	(	const Location &	name,
		const Location &	version,
		const Nodes &	args )

Calls the built-in with the provided name and arguments.

Parameters

name	The name of the built-in to call.
version	The Rego version.
args	The arguments to pass to the built-in.

Returns

The result of the built-in call.

create()

static std::shared_ptr< BuiltInsDef > rego::BuiltInsDef::create ( )

static

Creates the standard builtin set.

Returns

A shared pointer to the created BuiltInsDef.

decl()

Node rego::BuiltInsDef::decl

(

const Location &

name

)

Gets the declaration node for the specified built-in.

Parameters

name	The name of the built-in.

Returns

The declaration node for the built-in, or an empty node if not found.

is_builtin()

bool rego::BuiltInsDef::is_builtin

(

const Location &

name

)

Determines whether the provided name refers to a built-in.

Parameters

name	The name to check.

Returns

True if the name refers to a built-in, otherwise false.

is_deprecated()

bool rego::BuiltInsDef::is_deprecated	(	const Location &	version,
		const Location &	name ) const

Determines whether the provided builtin name is deprecated in the provided version.

Parameters

version	The version to check.
name	The name to check.

Returns

True if the builtin is deprecated in the specified version, otherwise false.

register_builtin()

BuiltInsDef & rego::BuiltInsDef::register_builtin

(

const BuiltIn &

built_in

)

Registers a built-in.

Parameters

built_in

The built-in to register.

Returns

A reference to this instance.

register_builtins()

template<typename T >

BuiltInsDef & rego::BuiltInsDef::register_builtins ( const T & built_ins )

inline

Registers a set of built-ins.

Parameters

built_ins

The built-ins to register.

Returns

A reference to this instance.

register_standard_builtins()

BuiltInsDef & rego::BuiltInsDef::register_standard_builtins

(

)

This method no longer needs to be called.

Deprecated

Returns

A reference to this instance.

strict_errors() [1/2]

bool rego::BuiltInsDef::strict_errors

(

)

const

Whether to throw built-in errors.

Returns

True if built-in errors will be thrown as exceptions, false otherwise. If true, built-in errors will be thrown as exceptions. If false, built-in errors will result in Undefined nodes.

strict_errors() [2/2]

BuiltInsDef & rego::BuiltInsDef::strict_errors

(

bool

strict_errors

)

Sets whether to throw built-in errors.

Parameters

strict_errors

True to throw built-in errors as exceptions, false to return Undefined nodes.

Returns

A reference to this instance.

whitelist() [1/2]

template<typename T >

BuiltInsDef & rego::BuiltInsDef::whitelist ( const std::initializer_list< T > & allowed )

inline

Sets a whitelist of built-in names that are allowed to be loaded.

Only built-ins whose names are in this list will be allowed. Any previous list and behavior will be overridden.

Parameters

allowed

the allowed built-in names

Returns

A reference to this instance

whitelist() [2/2]

template<typename T >

BuiltInsDef & rego::BuiltInsDef::whitelist ( T begin, T end )

inline

Sets a whitelist of built-in names that are allowed to be loaded.

Only built-ins whose names are in this list will be allowed. Any previous list and behavior will be overridden.

Parameters

begin	iterator pointing to the beginning of a range of allowed names
end	iterator pointing to the end of a range of allowed names

Returns

A reference to this instance

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

• include/rego/rego.hh