Class: Puppet::Pops::Types::Iterable::DepthFirstTreeIterator Private

Inherits:
TreeIterator show all
Defined in:
lib/puppet/pops/types/tree_iterators.rb

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.

Constant Summary

Constants inherited from TreeIterator

TreeIterator::DEFAULT_CONTAINERS

Instance Method Summary collapse

Methods inherited from TreeIterator

#each, #reverse_each, #size, #step, #to_a, #to_array, #unbounded?

Methods included from Puppet::Pops::Types::Iterable

asserted_iterable, #each, #element_type, #hash_style?, on, #reverse_each, #step, #to_a, unbounded?, #unbounded?

Constructor Details

#initialize(enum, options = EMPTY_HASH) ⇒ DepthFirstTreeIterator

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.

Creates a DepthFirstTreeIterator that by default treats all Array, Hash and Object instances as containers - the ‘containers’ option can be set to a type that denotes which types of values should be treated as containers - a ‘Variant[Array, Hash]` would for instance not treat Object values as containers, whereas just `Object` would only treat objects as containers.

Parameters:

  • options (Hash) (defaults to: EMPTY_HASH) —

    the options

Options Hash (options):

  • :containers (PTypeType) — default: 'Variant[Hash, Array, Object]' —

    The type(s) that should be treated as containers

  • :with_root (Boolean) — default: 'true' —

    If the root container itself should be included in the iteration



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# File 'lib/puppet/pops/types/tree_iterators.rb', line 136

def initialize(enum, options = EMPTY_HASH)
  super
end

Instance Method Details

#next ⇒ 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.

Raises:

  • (StopIteration) 


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# File 'lib/puppet/pops/types/tree_iterators.rb', line 140

def next
  loop do
    break if @value_stack.empty?

    # first call
    if @indexer_stack.empty?
      @indexer_stack << indexer_on(@root)
      @recursed = true
      return [[], @root] if @with_root
    end

    begin
      if @recursed
        @current_path << nil
        @recursed = false
      end
      idx = @indexer_stack[-1].next
      @current_path[-1] = idx
      v = @value_stack[-1]
      value = v.is_a?(PuppetObject) ? v.send(idx) : v[idx]
      indexer = indexer_on(value)
      if indexer
        # recurse
        @recursed = true
        @value_stack << value
        @indexer_stack << indexer
        redo unless @with_containers
      else
        redo unless @with_values
      end
      return [@current_path.dup, value]

    rescue StopIteration
      # end of current value's range of content
      # pop all until out of next values
      at_the_very_end = false
      loop do
        pop_level
        at_the_very_end = @indexer_stack.empty?
        break if at_the_very_end || has_next?(@indexer_stack[-1])
      end
    end
  end
  raise StopIteration
end