Class: WLang::Scope::NullScope

Inherits:

WLang::Scope

• Object
• WLang::Scope
• WLang::Scope::NullScope

Defined in:

lib/wlang/scope/null_scope.rb

Instance Attribute Summary

Attributes inherited from WLang::Scope

#parent, #subject

Instance Method Summary

• #fetch(key, dialect = nil, unfound = nil) ⇒ Object
• #initialize ⇒ NullScope constructor

  A new instance of NullScope.

• #inspect ⇒ Object (also: #to_s)
• #subjects ⇒ Object

Methods inherited from WLang::Scope

chain, coerce, #evaluate, null, #pop, #push, #root, #with

Constructor Details

#initialize ⇒ NullScope

Returns a new instance of NullScope.

# File 'lib/wlang/scope/null_scope.rb', line 5

def initialize
  super(nil)
end

Instance Method Details

#fetch(key, dialect = nil, unfound = nil) ⇒ Object

# File 'lib/wlang/scope/null_scope.rb', line 9

def fetch(key, dialect = nil, unfound = nil)
  unfound ? unfound.call : throw(:fail)
end

#inspect ⇒ Object Also known as: to_s

# File 'lib/wlang/scope/null_scope.rb', line 17

def inspect
  "NullScope"
end

#subjects ⇒ Object

# File 'lib/wlang/scope/null_scope.rb', line 13

def subjects
  []
end