Class: Nokogiri::XML::NodeSet

Inherits:
Object
  • Object
show all
Includes:
Enumerable
Defined in:
lib/nokogiri/xml/node_set.rb,
lib/nokogiri/ffi/xml/node_set.rb,
ext/nokogiri/xml_node_set.c

Overview

A NodeSet contains a list of Nokogiri::XML::Node objects. Typically a NodeSet is return as a result of searching a Document via Nokogiri::XML::Node#css or Nokogiri::XML::Node#xpath

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(document, list = []) {|_self| ... } ⇒ NodeSet

Create a NodeSet with document defaulting to list

Yields:

  • (_self)

Yield Parameters:



14
15
16
17
18
 
# File 'lib/nokogiri/xml/node_set.rb', line 14

def initialize document, list = []
  @document = document
  list.each { |x| self << x }
  yield self if block_given?
end

Instance Attribute Details

#cstruct ⇒ Object

:nodoc:



5
6
7
 
# File 'lib/nokogiri/ffi/xml/node_set.rb', line 5

def cstruct
  @cstruct
end

#document ⇒ Object

The Document this NodeSet is associated with



11
12
13
 
# File 'lib/nokogiri/xml/node_set.rb', line 11

def document
  @document
end

Class Method Details

.new(document, list = []) {|set| ... } ⇒ Object

:nodoc:

Yields:



98
99
100
101
102
103
104
 
# File 'lib/nokogiri/ffi/xml/node_set.rb', line 98

def self.new document, list = [] # :nodoc:
  set = NodeSet.wrap(LibXML.xmlXPathNodeSetCreate(nil))
  set.document = document
  list.each { |x| set << x }
  yield set if block_given?
  set
end

Instance Method Details

#&(node_set) ⇒ Object

Set Intersection — Returns a new NodeSet containing nodes common to the two NodeSets.



69
70
71
72
73
 
# File 'lib/nokogiri/ffi/xml/node_set.rb', line 69

def &(node_set) # :nodoc:
  raise(ArgumentError, "node_set must be a Nokogiri::XML::NodeSet") unless node_set.is_a?(XML::NodeSet)
  new_set_ptr = LibXML.xmlXPathIntersection(cstruct, node_set.cstruct)
  NodeSet.wrap(new_set_ptr)
end

#+ ⇒ Object 



304
 
# File 'lib/nokogiri/xml/node_set.rb', line 304

alias :+ :|

#-(node_set) ⇒ Object

Difference - returns a new NodeSet that is a copy of this NodeSet, removing

each item that also appears in +node_set+



32
33
34
35
36
37
38
39
40
41
 
# File 'lib/nokogiri/ffi/xml/node_set.rb', line 32

def -(node_set) # :nodoc:
  raise(ArgumentError, "node_set must be a Nokogiri::XML::NodeSet") unless node_set.is_a?(XML::NodeSet)
  new_set_ptr = LibXML.xmlXPathNodeSetMerge(nil, self.cstruct)

  other_nodetab = node_set.cstruct.nodeTab
  node_set.cstruct[:nodeNr].times do |j|
    LibXML.xmlXPathNodeSetDel(new_set_ptr, other_nodetab[j])
  end        
  NodeSet.wrap(new_set_ptr)
end

#<< ⇒ Object 



62
 
# File 'lib/nokogiri/xml/node_set.rb', line 62

alias :<< :push

#==(other) ⇒ Object

Equality – Two NodeSets are equal if the contain the same number of elements and if each element is equal to the corresponding element in the other NodeSet



282
283
284
285
286
287
288
289
 
# File 'lib/nokogiri/xml/node_set.rb', line 282

def == other
  return false unless other.is_a?(Nokogiri::XML::NodeSet)
  return false unless length == other.length
  each_with_index do |node, i|
    return false unless node == other[i]
  end
  true
end

#[](*args) ⇒ Object Also known as: slice

start, length

-> NodeSet or nil

range

-> NodeSet or nil

slice(index) -> Node or nil
slice(start, length) -> NodeSet or nil
slice(range) -> NodeSet or nil

Element reference - returns the node at index, or returns a NodeSet containing nodes starting at start and continuing for length elements, or returns a NodeSet containing nodes specified by range. Negative indices count backward from the end of the node_set (-1 is the last node). Returns nil if the index (or start) are out of range.



52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
 
# File 'lib/nokogiri/ffi/xml/node_set.rb', line 52

def [](*args) # :nodoc:
  raise(ArgumentError, "got #{args.length} arguments, expected 1 (or 2)") if args.length > 2

  if args.length == 2
    beg = args[0]
    len = args[1]
    beg += cstruct[:nodeNr] if beg < 0
    return subseq(beg, len)
  end
  arg = args[0]

  return subseq(arg.first, arg.last-arg.first+1) if arg.is_a?(Range)

  index_at(arg)
end

#add_class(name) ⇒ Object

Append the class attribute name to all Node objects in the NodeSet.



151
152
153
154
155
156
157
 
# File 'lib/nokogiri/xml/node_set.rb', line 151

def add_class name
  each do |el|
    classes = el['class'].to_s.split(/\s+/)
    el['class'] = classes.push(name).uniq.join " "
  end
  self
end

#after(datum) ⇒ Object

Insert datum after the last Node in this NodeSet



58
59
60
 
# File 'lib/nokogiri/xml/node_set.rb', line 58

def after datum
  last.after datum
end

#at(path, ns = document.root ? document.root.namespaces : {}) ⇒ Object Also known as: %

If path is a string, search this document for path returning the first Node. Otherwise, index in to the array with path.



143
144
145
146
 
# File 'lib/nokogiri/xml/node_set.rb', line 143

def at path, ns = document.root ? document.root.namespaces : {}
  return self[path] if path.is_a?(Numeric)
  search(path, ns).first
end

#attr(key, value = nil, &blk) ⇒ Object Also known as: set, attribute

Set the attribute key to value or the return value of blk on all Node objects in the NodeSet.



182
183
184
185
186
187
188
189
190
191
192
 
# File 'lib/nokogiri/xml/node_set.rb', line 182

def attr key, value = nil, &blk
  unless Hash === key || key && (value || blk)
    return first.attribute(key)
  end

  hash = key.is_a?(Hash) ? key : { key => value }

  hash.each { |k,v| each { |el| el[k] = v || blk[el] } }

  self
end

#before(datum) ⇒ Object

Insert datum before the first Node in this NodeSet



52
53
54
 
# File 'lib/nokogiri/xml/node_set.rb', line 52

def before datum
  first.before datum
end

#children ⇒ Object

Returns a new NodeSet containing all the children of all the nodes in the NodeSet



294
295
296
 
# File 'lib/nokogiri/xml/node_set.rb', line 294

def children
  inject(NodeSet.new(document)) { |set, node| set += node.children }
end

#css(*paths) ⇒ Object

Search this NodeSet for css paths

For more information see Nokogiri::XML::Node#css



95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
 
# File 'lib/nokogiri/xml/node_set.rb', line 95

def css *paths
  handler = ![
    Hash, String, Symbol
  ].include?(paths.last.class) ? paths.pop : nil

  ns = paths.last.is_a?(Hash) ? paths.pop : nil

  sub_set = NodeSet.new(document)

  each do |node|
    doc = node.document
    search_ns = ns || doc.root ? doc.root.namespaces : {}

    xpaths = paths.map { |rule|
      [
        CSS.xpath_for(rule.to_s, :prefix => ".//", :ns => search_ns),
        CSS.xpath_for(rule.to_s, :prefix => "self::", :ns => search_ns)
      ].join(' | ')
    }

    sub_set += node.xpath(*(xpaths + [search_ns, handler].compact))
  end
  document.decorate(sub_set)
  sub_set
end

#delete(node) ⇒ Object

Delete node from the Nodeset, if it is a member. Returns the deleted node if found, otherwise returns nil.



43
44
45
46
47
48
49
50
 
# File 'lib/nokogiri/ffi/xml/node_set.rb', line 43

def delete(node) # :nodoc:
  raise(ArgumentError, "node must be a Nokogiri::XML::Node") unless node.is_a?(XML::Node)
  if LibXML.xmlXPathNodeSetContains(cstruct, node.cstruct) != 0
    LibXML.xmlXPathNodeSetDel(cstruct, node.cstruct)
    return node
  end
  return nil
end

#dup ⇒ Object

Duplicate this node set



7
8
9
10
 
# File 'lib/nokogiri/ffi/xml/node_set.rb', line 7

def dup # :nodoc:
  dup = LibXML.xmlXPathNodeSetMerge(nil, self.cstruct)
  NodeSet.wrap(dup)
end

#each(&block) ⇒ Object

Iterate over each node, yielding to block



205
206
207
208
209
 
# File 'lib/nokogiri/xml/node_set.rb', line 205

def each(&block)
  0.upto(length - 1) do |x|
    yield self[x]
  end
end

#empty? ⇒ Boolean

Is this NodeSet empty?

Returns:

  • (Boolean) 


39
40
41
 
# File 'lib/nokogiri/xml/node_set.rb', line 39

def empty?
  length == 0
end

#first(n = nil) ⇒ Object

Get the first element of the NodeSet.



22
23
24
25
26
27
28
29
 
# File 'lib/nokogiri/xml/node_set.rb', line 22

def first n = nil
  return self[0] unless n
  list = []
  0.upto(n - 1) do |i|
    list << self[i]
  end
  list
end

#include?(node) ⇒ Boolean

Returns true if any member of node set equals node.

Returns:

  • (Boolean) 


75
76
77
78
 
# File 'lib/nokogiri/ffi/xml/node_set.rb', line 75

def include?(node) # :nodoc:
  raise(ArgumentError, "node must be a Nokogiri::XML::Node") unless node.is_a?(XML::Node)
  (LibXML.xmlXPathNodeSetContains(cstruct, node.cstruct) != 0) ? true : false
end

#index(node) ⇒ Object

Returns the index of the first node in self that is == to node. Returns nil if no match is found.



45
46
47
48
 
# File 'lib/nokogiri/xml/node_set.rb', line 45

def index(node)
  each_with_index { |member, j| return j if member == node }
  nil
end

#inner_html ⇒ Object

Get the inner html of all contained Node objects



220
221
222
 
# File 'lib/nokogiri/xml/node_set.rb', line 220

def inner_html
  collect{|j| j.inner_html}.join('')
end

#inner_text ⇒ Object Also known as: text

Get the inner text of all contained Node objects



213
214
215
 
# File 'lib/nokogiri/xml/node_set.rb', line 213

def inner_text
  collect{|j| j.inner_text}.join('')
end

#inspect ⇒ Object

Return a nicely formated string representation



300
301
302
 
# File 'lib/nokogiri/xml/node_set.rb', line 300

def inspect
  "[#{map { |c| c.inspect }.join ', '}]"
end

#last ⇒ Object

Get the last element of the NodeSet.



33
34
35
 
# File 'lib/nokogiri/xml/node_set.rb', line 33

def last
  self[length - 1]
end

#length ⇒ Object

Get the length of the node set



12
13
14
 
# File 'lib/nokogiri/ffi/xml/node_set.rb', line 12

def length # :nodoc:
  cstruct.pointer.null? ? 0 : cstruct[:nodeNr]
end

#pop ⇒ Object

Removes the last element from set and returns it, or nil if the set is empty



265
266
267
268
 
# File 'lib/nokogiri/xml/node_set.rb', line 265

def pop
  return nil if length == 0
  delete last
end

#push(node) ⇒ Object

Append node to the NodeSet.



16
17
18
19
20
 
# File 'lib/nokogiri/ffi/xml/node_set.rb', line 16

def push(node) # :nodoc:
  raise(ArgumentError, "node must be a Nokogiri::XML::Node") unless node.is_a?(XML::Node)
  LibXML.xmlXPathNodeSetAdd(cstruct, node.cstruct)
  self
end

#remove ⇒ Object 



63
 
# File 'lib/nokogiri/xml/node_set.rb', line 63

alias :remove :unlink

#remove_attr(name) ⇒ Object

Remove the attributed named name from all Node objects in the NodeSet



198
199
200
201
 
# File 'lib/nokogiri/xml/node_set.rb', line 198

def remove_attr name
  each { |el| el.delete name }
  self
end

#remove_class(name = nil) ⇒ Object

Remove the class attribute name from all Node objects in the NodeSet. If name is nil, remove the class attribute from all Nodes in the NodeSet.



163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
 
# File 'lib/nokogiri/xml/node_set.rb', line 163

def remove_class name = nil
  each do |el|
    if name
      classes = el['class'].to_s.split(/\s+/)
      if classes.empty?
        el.delete 'class'
      else
        el['class'] = (classes - [name]).uniq.join " "
      end
    else
      el.delete "class"
    end
  end
  self
end

#search(*paths) ⇒ Object Also known as: /

Search this document for paths

For more information see Nokogiri::XML::Node#css and Nokogiri::XML::Node#xpath



70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
 
# File 'lib/nokogiri/xml/node_set.rb', line 70

def search *paths
  handler = ![
    Hash, String, Symbol
  ].include?(paths.last.class) ? paths.pop : nil

  ns = paths.last.is_a?(Hash) ? paths.pop : nil

  sub_set = NodeSet.new(document)

  paths.each do |path|
    sub_set += send(
      path =~ /^(\.\/|\/)/ ? :xpath : :css,
      *(paths + [ns, handler]).compact
    )
  end

  document.decorate(sub_set)
  sub_set
end

#shift ⇒ Object

Returns the first element of the NodeSet and removes it. Returns nil if the set is empty.



273
274
275
276
 
# File 'lib/nokogiri/xml/node_set.rb', line 273

def shift
  return nil if length == 0
  delete first
end

#size ⇒ Object 



259
 
# File 'lib/nokogiri/xml/node_set.rb', line 259

alias :size :length

#to_a ⇒ Object

Return this list as an Array



80
81
82
 
# File 'lib/nokogiri/ffi/xml/node_set.rb', line 80

def to_a # :nodoc:
  cstruct.nodeTab.collect { |node| Node.wrap(node) }
end

#to_ary ⇒ Object 



260
 
# File 'lib/nokogiri/xml/node_set.rb', line 260

alias :to_ary :to_a

#to_html(*args) ⇒ Object

Convert this NodeSet to HTML



243
244
245
 
# File 'lib/nokogiri/xml/node_set.rb', line 243

def to_html *args
  map { |x| x.to_html(*args) }.join
end

#to_s ⇒ Object

Convert this NodeSet to a string.



237
238
239
 
# File 'lib/nokogiri/xml/node_set.rb', line 237

def to_s
  map { |x| x.to_s }.join
end

#to_xhtml(*args) ⇒ Object

Convert this NodeSet to XHTML



249
250
251
 
# File 'lib/nokogiri/xml/node_set.rb', line 249

def to_xhtml *args
  map { |x| x.to_xhtml(*args) }.join
end

#to_xml(*args) ⇒ Object

Convert this NodeSet to XML



255
256
257
 
# File 'lib/nokogiri/xml/node_set.rb', line 255

def to_xml *args
  map { |x| x.to_xml(*args) }.join
end

#unlink ⇒ Object

Unlink this NodeSet and all Node objects it contains from their current context.



84
85
86
87
88
89
90
91
92
93
94
95
96
 
# File 'lib/nokogiri/ffi/xml/node_set.rb', line 84

def unlink # :nodoc:
  # TODO: is this simpler implementation viable:
  #  cstruct.nodeTab.collect {|node| Node.wrap(node)}.each(&:unlink)
  # ?
  nodetab = cstruct.nodeTab
  cstruct[:nodeNr].times do |j|
    node = Node.wrap(nodetab[j])
    node.unlink
    nodetab[j] = node.cstruct.pointer
  end
  cstruct.nodeTab = nodetab
  self
end

#wrap(html, &blk) ⇒ Object

Wrap this NodeSet with html or the results of the builder in blk



226
227
228
229
230
231
232
233
 
# File 'lib/nokogiri/xml/node_set.rb', line 226

def wrap(html, &blk)
  each do |j|
    new_parent = Nokogiri.make(html, &blk)
    j.add_next_sibling(new_parent)
    new_parent.add_child(j)
  end
  self
end

#xpath(*paths) ⇒ Object

Search this NodeSet for XPath paths

For more information see Nokogiri::XML::Node#xpath



125
126
127
128
129
130
131
132
133
134
135
136
137
138
 
# File 'lib/nokogiri/xml/node_set.rb', line 125

def xpath *paths
  handler = ![
    Hash, String, Symbol
  ].include?(paths.last.class) ? paths.pop : nil

  ns = paths.last.is_a?(Hash) ? paths.pop : nil

  sub_set = NodeSet.new(document)
  each do |node|
    sub_set += node.xpath(*(paths + [ns, handler].compact))
  end
  document.decorate(sub_set)
  sub_set
end

#|(node_set) ⇒ Object

Returns a new set built by merging the set and the elements of the given set.



22
23
24
25
26
27
28
29
30
 
# File 'lib/nokogiri/ffi/xml/node_set.rb', line 22

def |(node_set) # :nodoc:
  raise(ArgumentError, "node_set must be a Nokogiri::XML::NodeSet") unless node_set.is_a?(XML::NodeSet)
  new_set_ptr = LibXML::xmlXPathNodeSetMerge(nil, self.cstruct)
  new_set_ptr = LibXML::xmlXPathNodeSetMerge(new_set_ptr, node_set.cstruct)

  new_set = NodeSet.wrap(new_set_ptr)
  new_set.document = document
  new_set
end