org.serversass

Class Scope

java.lang.Object

org.serversass.Scope

public class Scope
extends Object

Represents a map which binds values to variable names.

To support nested contexts of mixins, a parent scope can be given, which will be used to resolve unknown variables.

Constructor Summary

Constructors

Constructor and Description
Scope() Creates a new and empty scope without a parent scope
Scope(Scope scope) Creates a new and empty scope using the given parameter as parent scope.

Method Summary

Modifier and Type	Method and Description
Expression	get(String name) Returns the value previously set for the given variable.
boolean	has(String name) Determines if this scope has a value set for the given variable.
void	set(String name, Expression value) Sets a variable in this scope.

Methods inherited from class java.lang.Object

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

Constructor Detail

Scope

public Scope()

Creates a new and empty scope without a parent scope

Scope

public Scope(Scope scope)

Creates a new and empty scope using the given parameter as parent scope.

Parameters:

scope - the parent scope to use

Method Detail

set

public void set(String name,
                Expression value)

Sets a variable in this scope. If a variable with the same name exists in the parent scope, this will be shadowed (no longer reachable) but not changed.

Parameters:

name - the name of the variable to set

value - the value of the variable to set

get

public Expression get(String name)

Returns the value previously set for the given variable.

Parameters:

name - the variable to lookup

Returns:

the value associated with the given name. Uses the parent scope if no variable with the given name exists. Returns a Value with "" as content, in case the value is completely unknown.

has

public boolean has(String name)

Determines if this scope has a value set for the given variable. The parent scope will not be checked.

Parameters:

name - the variable to lookup

Returns:

true if a variable with the given name exists in this scope, false otherwise.