Class: Nokogiri::CSS::Node

Inherits:
Object
  • Object
show all
Defined in:
lib/nokogiri/css/node.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(type, value) ⇒ Node

Create a new Node with type and value



11
12
13
14
 
# File 'lib/nokogiri/css/node.rb', line 11

def initialize type, value
  @type = type
  @value = value
end

Instance Attribute Details

#type ⇒ Object

Get the type of this node



6
7
8
 
# File 'lib/nokogiri/css/node.rb', line 6

def type
  @type
end

#value ⇒ Object

Get the value of this node



8
9
10
 
# File 'lib/nokogiri/css/node.rb', line 8

def value
  @value
end

Instance Method Details

#accept(visitor) ⇒ Object

Accept visitor



17
18
19
 
# File 'lib/nokogiri/css/node.rb', line 17

def accept visitor
  visitor.send(:"visit_#{type.to_s.downcase}", self)
end

#find_by_type(types) ⇒ Object

Find a node by type using types



78
79
80
81
82
83
84
85
 
# File 'lib/nokogiri/css/node.rb', line 78

def find_by_type types
  matches = []
  matches << self if to_type == types
  @value.each do |v|
    matches += v.find_by_type(types) if v.respond_to?(:find_by_type)
  end
  matches
end

#preprocess! ⇒ Object

Preprocess this node tree



29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
 
# File 'lib/nokogiri/css/node.rb', line 29

def preprocess!
  ### Deal with nth-child
  matches = find_by_type(
    [:CONDITIONAL_SELECTOR,
      [:ELEMENT_NAME],
      [:PSEUDO_CLASS,
        [:FUNCTION]
      ]
    ]
  )
  matches.each do |match|
    if match.value[1].value[0].value[0] =~ /^nth-(last-)?child/
      tag_name = match.value[0].value.first
      match.value[0].value = ['*']
      match.value[1] = Node.new(:COMBINATOR, [
        match.value[1].value[0],
        Node.new(:FUNCTION, ['self(', tag_name])
      ])
    end
  end

  ### Deal with first-child, last-child
  matches = find_by_type(
    [:CONDITIONAL_SELECTOR,
      [:ELEMENT_NAME], [:PSEUDO_CLASS]
  ])
  matches.each do |match|
    if ['first-child', 'last-child'].include?(match.value[1].value.first)
      which = match.value[1].value.first.gsub(/-\w*$/, '')
      tag_name = match.value[0].value.first
      match.value[0].value = ['*']
      match.value[1] = Node.new(:COMBINATOR, [
        Node.new(:FUNCTION, ["#{which}("]),
        Node.new(:FUNCTION, ['self(', tag_name])
      ])
    elsif 'only-child' == match.value[1].value.first
      tag_name = match.value[0].value.first
      match.value[0].value = ['*']
      match.value[1] = Node.new(:COMBINATOR, [
        Node.new(:FUNCTION, ["#{match.value[1].value.first}("]),
        Node.new(:FUNCTION, ['self(', tag_name])
      ])
    end
  end

  self
end

#to_a ⇒ Object

Convert to array



95
96
97
 
# File 'lib/nokogiri/css/node.rb', line 95

def to_a
  [@type] + @value.map { |n| n.respond_to?(:to_a) ? n.to_a : [n] }
end

#to_type ⇒ Object

Convert to_type



88
89
90
91
92
 
# File 'lib/nokogiri/css/node.rb', line 88

def to_type
  [@type] + @value.map { |n|
    n.to_type if n.respond_to?(:to_type)
  }.compact
end

#to_xpath(prefix = '//', visitor = XPathVisitor.new) ⇒ Object

Convert this CSS node to xpath with prefix using visitor



23
24
25
26
 
# File 'lib/nokogiri/css/node.rb', line 23

def to_xpath prefix = '//', visitor = XPathVisitor.new
  self.preprocess!
  prefix + visitor.accept(self)
end