Class: JPath::Item

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

Instance Method Summary collapse

Constructor Details

#initialize(hash) ⇒ Item

Returns a new instance of Item.



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# File 'lib/jpath/item.rb', line 4

def initialize(hash)
  @hash = hash
end

Instance Method Details

#[](pointer) ⇒ Object 



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# File 'lib/jpath/item.rb', line 8

def [](pointer)
  result = @hash
  if pointer.is_a?(String)
    pointer = Pointer.parse(pointer)
  end
  pointer.each do |key|
    unless result.is_a?(Array) or result.is_a?(Hash)
      return nil
    end
    if result.is_a?(Array) && !key.is_a?(Numeric)
      return nil
    end
    result = result[key]
  end
  result
end

#ancestors(pointer) ⇒ Object 



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# File 'lib/jpath/item.rb', line 39

def ancestors(pointer)
  if pointer.is_a?(String)
    pointer = Pointer.parse(pointer)
  end
  obj = parent(pointer)
  if obj.nil?
    []
  else
    [obj, ancestors(obj)].flatten
  end
end

#attributes(pointer) ⇒ Object 



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# File 'lib/jpath/item.rb', line 51

def attributes(pointer)
  enum_for(:each_attribute, pointer)
end

#children(pointer) ⇒ Object 



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# File 'lib/jpath/item.rb', line 55

def children(pointer)
  enum_for(:each_child, pointer)
end

#descendants(pointer) ⇒ Object 



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# File 'lib/jpath/item.rb', line 59

def descendants(pointer)
  enum_for(:each_descendant, pointer)
end

#following(pointer) ⇒ Object 



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# File 'lib/jpath/item.rb', line 63

def following(pointer)
  enum_for(:each_following, pointer)
end

#parent(pointer) ⇒ Object 



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# File 'lib/jpath/item.rb', line 25

def parent(pointer)
  if pointer.is_a?(String)
    pointer = Pointer.parse(pointer)
  end
  if pointer.top?
    return nil
  end
  if pointer.index?
    pointer.grandparent
  else
    pointer.parent
  end
end

#preceding(pointer) ⇒ Object 



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# File 'lib/jpath/item.rb', line 67

def preceding(pointer)
  enum_for(:each_preceding, pointer)
end