Module: QAT::Utils::Hash

Defined in:
lib/qat/utils/hash.rb

Overview

This module gives helper methods for Hash

Class Method Summary collapse

Class Method Details

Returns values form a given path (keys) of a complex structure of data



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# File 'lib/qat/utils/hash.rb', line 13

def navigate_path(node, path, possible_leaf_nodes = [])

  node = node.dup.symbolize_keys if node.kind_of?(::Hash)

  if path.empty?
    possible_leaf_nodes << node
    return possible_leaf_nodes
  end

  path      = path.dup
  path_head = path.shift
  regex     = '.*\[(\*|-?\d+)\]'

  obj_index = nil
  match     = path_head.to_s.match(regex)
  if match
    index     = match.begin(1)
    obj_index = match[1]
    path_head = path_head.slice(0, index - 1).to_sym
  end

  if !node || (!node.kind_of?(Array) && !node.keys.map(&:to_sym).include?(path_head.to_sym))
    possible_leaf_nodes << :field_not_found
    return possible_leaf_nodes
  end

  new_node = nil
  if node.kind_of?(Array) && obj_index #index is prefixed
    if obj_index.eql? '*'
      node.each do |item|
        navigate_path(item, path, possible_leaf_nodes)
      end
      possible_leaf_nodes
    else
      new_node = node[obj_index.to_i]
    end

  else
    new_node = node[path_head.to_sym]
  end


  if new_node.kind_of?(Array) && obj_index #index is suffixed
    if obj_index.eql? '*'
      new_node.each do |item|
        navigate_path(item, path, possible_leaf_nodes)
      end
      possible_leaf_nodes
    else
      new_node = new_node[obj_index.to_i]
      navigate_path(new_node, path, possible_leaf_nodes)
    end
  else
    navigate_path(new_node, path, possible_leaf_nodes)
  end
end