Class: Mullet::DefaultNestedScope

Inherits:
Object
  • Object
show all
Includes:
Scope
Defined in:
lib/mullet/default_nested_scope.rb

Overview

Composite scope that combines scopes in nested scopes. Tries each scope in sequence until a value is successfully resolved.

Constant Summary

Constants included from Scope

Scope::NOT_FOUND

Instance Method Summary collapse

Constructor Details

#initialize(*data_objects) ⇒ DefaultNestedScope

Constructor



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# File 'lib/mullet/default_nested_scope.rb', line 14

def initialize(*data_objects)
  @scopes = []
  data_objects.each {|data| push_scope(data) }
end

Instance Method Details

#get_variable_value(name) ⇒ Object

Resolves variable name to value.



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# File 'lib/mullet/default_nested_scope.rb', line 24

def get_variable_value(name)
  @scopes.reverse_each do |scope|
    value = scope.get_variable_value(name)
    if value != NOT_FOUND
      return value
    end
  end

  return NOT_FOUND
end

#pop_scope ⇒ Object

Removes innermost nested scope.



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# File 'lib/mullet/default_nested_scope.rb', line 45

def pop_scope()
  @scopes.pop()
end

#push_scope(data) ⇒ Object

Adds new innermost nested scope.



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# File 'lib/mullet/default_nested_scope.rb', line 39

def push_scope(data)
  @scopes.push(
      data.respond_to?(:get_variable_value) ? data : DefaultScope.new(data))
end