Class: REXML::CSSSelector::BaseAdapter

Inherits:
Object
  • Object
show all
Defined in:
lib/rexml/css_selector/base_adapter.rb

Overview

BaseAdapter is a base class of adapters.

An adapter is an abstraction of tree traversal operations for CSS selectors. We need to implement the following methods minimally:

  • element?(node)

  • get_tag_name(element)

  • get_attribute(element, name, namespace = nil, attribute_name_case = :sensitive)

  • get_document_node(element)

  • get_parent_node(element)

  • get_previous_sibling_node(element)

  • each_child_element(element, &)

Instance Method Summary collapse

Instance Method Details

#checked?(element) ⇒ Boolean

Checks whether element is checked.

This method is used for :checked.

Returns:

  • (Boolean) 


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# File 'lib/rexml/css_selector/base_adapter.rb', line 36

def checked?(element)
  !!get_attribute(element, "checked")
end

#disabled?(element) ⇒ Boolean

Checks whether element is disabled.

This method is used for :disabled.

Returns:

  • (Boolean) 


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# File 'lib/rexml/css_selector/base_adapter.rb', line 43

def disabled?(element)
  !!get_attribute(element, "disabled")
end

#each_recursive_element(element) ⇒ Object

Enumerates the elements in element



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# File 'lib/rexml/css_selector/base_adapter.rb', line 80

def each_recursive_element(element, &)
  each_child_element(element) do |child|
    yield child
    each_recursive_element(child, &)
  end
end

#empty?(element) ⇒ Boolean

Checks whether element is empty.

This method is used for :empty.

Returns:

  • (Boolean) 


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# File 'lib/rexml/css_selector/base_adapter.rb', line 28

def empty?(element)
  each_child_element(element) { return false }
  true
end

#get_children_elements(element) ⇒ Object

Returns an array of children elements of element.



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# File 'lib/rexml/css_selector/base_adapter.rb', line 53

def get_children_elements(element)
  elements = []
  each_child_element(element) { elements << _1 }
  elements
end

#get_class_names(element) ⇒ Object

Returns class names of element.



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# File 'lib/rexml/css_selector/base_adapter.rb', line 70

def get_class_names(element)
  get_attribute(element, "class")&.split(/\s+/) || []
end

#get_element_index(parent, element) ⇒ Object

Returns the index of element in the children of parent.



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# File 'lib/rexml/css_selector/base_adapter.rb', line 60

def get_element_index(parent, element)
  i = 0
  each_child_element(parent) do |child|
    return i if element == child
    i += 1
  end
  nil
end

#get_id(element) ⇒ Object

Returns the ID name of element.



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# File 'lib/rexml/css_selector/base_adapter.rb', line 75

def get_id(element)
  get_attribute(element, "id")
end

#get_namespace(_element) ⇒ Object

Returns a namespace of element.



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# File 'lib/rexml/css_selector/base_adapter.rb', line 48

def get_namespace(_element)
  nil
end

#root?(element) ⇒ Boolean

Checks whether element is the root element.

This method is used for :root.

Returns:

  • (Boolean) 


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# File 'lib/rexml/css_selector/base_adapter.rb', line 21

def root?(element)
  get_parent_node(element) == get_document_node(element)
end