Class: HashQuery::Query

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

Instance Method Summary collapse

Constructor Details

#initialize(hash) ⇒ Query

Returns a new instance of Query.



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# File 'lib/hash_query.rb', line 56

def initialize(hash)
  @hash = hash
end

Instance Method Details

#array_y?(node) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/hash_query.rb', line 75

def array_y?(node)
  node.class.ancestors.include?(Array)
end

#descend(selectors, node, found) ⇒ Object 



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# File 'lib/hash_query.rb', line 79

def descend(selectors, node, found)
  return if node.nil? || (!hash_y?(node) && !array_y?(node))
  descend_array(selectors, node, found) if array_y?(node)
  descend_hash(selectors, node, found)  if hash_y?(node)
  return found
end

#descend_array(selectors, node, found) ⇒ Object 



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# File 'lib/hash_query.rb', line 86

def descend_array(selectors, node, found)
  node.each do |a|
    descend(selectors, a, found)
  end
end

#descend_hash(selectors, node, found) ⇒ Object 



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# File 'lib/hash_query.rb', line 92

def descend_hash(selectors, node, found)
  selectors = selectors.dup

  if selectors.first.match?(node)
    selector = selectors.shift
    if selectors.size == 0
      found << selector.match!(node)
    else
      descend(selectors, selector.match!(node), found)
    end
  else
    node.select { |k, node| hash_y?(node) || array_y?(node) }.each do |k, node| 
      descend(selectors, node, found)
    end
  end
end

#hash_y?(node) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/hash_query.rb', line 71

def hash_y?(node)
  node.class.ancestors.include?(Hash)
end

#query(selectors) ⇒ Object 



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# File 'lib/hash_query.rb', line 60

def query(selectors)
  selectors = Selector.parse(selectors)
  found = descend(selectors, @hash, [])
  
  if found.empty?
    nil
  else
    found
  end
end