Class: Puppet::Context::EmptyStack Private

Inherits:
Object
  • Object
show all
Defined in:
lib/puppet/context.rb

Overview

This class is part of a private API. You should avoid using this class if possible, as it may be removed or be changed in the future.

Base case for Puppet::Context::Stack.

Instance Method Summary collapse

Instance Method Details

#bindings ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Return the bindings table, which is always empty here



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# File 'lib/puppet/context.rb', line 136

def bindings
  {}
end

#lookup(name, &block) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Lookup a binding. Since there are none in EmptyStack, this always raises an exception unless a block is passed, in which case the block is called and its return value is used.



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# File 'lib/puppet/context.rb', line 109

def lookup(name, &block)
  if block
    block.call
  else
    raise UndefinedBindingError, _("Unable to lookup '%{name}'") % { name: name }
  end
end

#pop ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Base case of #pop always raises an error since this is the bottom

Raises:



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# File 'lib/puppet/context.rb', line 120

def pop
  raise(StackUnderflow,
        _('Attempted to pop, but already at root of the context stack.'))
end

#push(overrides, description = '') ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Push bindings onto the stack by creating a new Stack object with ‘self` as the parent



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# File 'lib/puppet/context.rb', line 129

def push(overrides, description = '')
  Puppet::Context::Stack.new(self, overrides, description)
end