Package net.hydromatic.morel.compile

Class Environments.EmptyEnvironment

java.lang.Object

net.hydromatic.morel.compile.Environment

net.hydromatic.morel.compile.Environments.EmptyEnvironment

Enclosing class:

Environments

private static class Environments.EmptyEnvironment
extends Environment

Empty environment.

Field Summary

Fields

Modifier and Type	Field	Description
(package private) static Environments.EmptyEnvironment	INSTANCE

Constructor Summary

Constructors

Modifier	Constructor	Description
private	EmptyEnvironment()

Method Summary

Modifier and Type	Method	Description
(package private) int	distance(int soFar, Core.NamedPat id)
@Nullable Binding	getOpt(String name)	Returns the binding of name if bound, null if not.
@Nullable Binding	getOpt(Core.NamedPat id)	Returns the binding of id if bound, null if not.
(package private) Environment	nearestAncestorNotObscuredBy(Set<Core.NamedPat> names)	If this environment only defines bindings in the given set, returns its parent.
(package private) void	visit(Consumer<Binding> consumer)	Visits every variable binding in this environment.

Methods inherited from class net.hydromatic.morel.compile.Environment

asString, bind, bind, bindAll, forEachType, forEachValue, getValueMap, plus

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

INSTANCE

static final Environments.EmptyEnvironment INSTANCE

Constructor Detail

EmptyEnvironment

private EmptyEnvironment()

Method Detail

visit

void visit(Consumer<Binding> consumer)

Description copied from class: Environment

Visits every variable binding in this environment.

Bindings that are obscured by more recent bindings of the same name are visited, but after the more obscuring bindings.

Specified by:

visit in class Environment

getOpt

public @Nullable Binding getOpt(String name)

Description copied from class: Environment

Returns the binding of name if bound, null if not.

Specified by:

getOpt in class Environment

getOpt

public @Nullable Binding getOpt(Core.NamedPat id)

Description copied from class: Environment

Returns the binding of id if bound, null if not.

Specified by:

getOpt in class Environment

nearestAncestorNotObscuredBy

Environment nearestAncestorNotObscuredBy(Set<Core.NamedPat> names)

Description copied from class: Environment

If this environment only defines bindings in the given set, returns its parent. Never returns null. The empty environment returns itself.

Specified by:

nearestAncestorNotObscuredBy in class Environment

distance

int distance(int soFar,
             Core.NamedPat id)

Specified by:

distance in class Environment