class Nokogiri::XML::NodeSet

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::Searchable#css or Nokogiri::XML::Searchable#xpath

Constants

LOOKS_LIKE_XPATH: Included from Nokogiri::XML::Searchable

Regular expression used by Searchable#search to determine if a query string is CSS or XPath

Attributes

document[RW]

The Document this NodeSet is associated with

Public Class Methods

new(document, list = []) { |self| ... } click to toggle source

Create a NodeSet with document defaulting to list

# File lib/nokogiri/xml/node_set.rb, line 20
def initialize(document, list = [])
  @document = document
  document.decorate(self)
  list.each { |x| self << x }
  yield self if block_given?
end

Public Instance Methods

search *paths, [namespace-bindings, xpath-variable-bindings, custom-handler-class]

Alias for: at

&(node_set) click to toggle source

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

static VALUE
intersection(VALUE rb_self, VALUE rb_other)
{
  xmlNodeSetPtr c_self, c_other ;
  xmlNodeSetPtr intersection;

  if (!rb_obj_is_kind_of(rb_other, cNokogiriXmlNodeSet)) {
    rb_raise(rb_eArgError, "node_set must be a Nokogiri::XML::NodeSet");
  }

  TypedData_Get_Struct(rb_self, xmlNodeSet, &xml_node_set_type, c_self);
  TypedData_Get_Struct(rb_other, xmlNodeSet, &xml_node_set_type, c_other);

  intersection = xmlXPathIntersection(c_self, c_other);
  return noko_xml_node_set_wrap(intersection, rb_iv_get(rb_self, "@document"));
}

+(p1)

Alias for: |

-(node_set) click to toggle source

Difference - returns a new NodeSet that is a copy of this NodeSet, removing each item that also appears in node_set

static VALUE
minus(VALUE rb_self, VALUE rb_other)
{
  xmlNodeSetPtr c_self, c_other;
  xmlNodeSetPtr new;
  int j ;

  if (!rb_obj_is_kind_of(rb_other, cNokogiriXmlNodeSet)) {
    rb_raise(rb_eArgError, "node_set must be a Nokogiri::XML::NodeSet");
  }

  TypedData_Get_Struct(rb_self, xmlNodeSet, &xml_node_set_type, c_self);
  TypedData_Get_Struct(rb_other, xmlNodeSet, &xml_node_set_type, c_other);

  new = xmlXPathNodeSetMerge(NULL, c_self);
  for (j = 0 ; j < c_other->nodeNr ; ++j) {
    xpath_node_set_del(new, c_other->nodeTab[j]);
  }

  return noko_xml_node_set_wrap(new, rb_iv_get(rb_self, "@document"));
}

<<(p1)

Alias for: push

==(other) click to toggle source

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

# File lib/nokogiri/xml/node_set.rb, line 393
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

[index] → Node or nil click to toggle source

[start, length] → NodeSet or nil

[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.

static VALUE
slice(int argc, VALUE *argv, VALUE rb_self)
{
  VALUE arg ;
  long beg, len ;
  xmlNodeSetPtr c_self;

  TypedData_Get_Struct(rb_self, xmlNodeSet, &xml_node_set_type, c_self);

  if (argc == 2) {
    beg = NUM2LONG(argv[0]);
    len = NUM2LONG(argv[1]);
    if (beg < 0) {
      beg += c_self->nodeNr ;
    }
    return subseq(rb_self, beg, len);
  }

  if (argc != 1) {
    rb_scan_args(argc, argv, "11", NULL, NULL);
  }
  arg = argv[0];

  if (FIXNUM_P(arg)) {
    return index_at(rb_self, FIX2LONG(arg));
  }

  /* if arg is Range */
  switch (rb_range_beg_len(arg, &beg, &len, (long)c_self->nodeNr, 0)) {
    case Qfalse:
      break;
    case Qnil:
      return Qnil;
    default:
      return subseq(rb_self, beg, len);
  }

  return index_at(rb_self, NUM2LONG(arg));
}

Also aliased as: slice

add_class(name) click to toggle source

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

See Nokogiri::XML::Node#add_class for more information.

# File lib/nokogiri/xml/node_set.rb, line 139
def add_class(name)
  each do |el|
    el.add_class(name)
  end
  self
end

after(datum) click to toggle source

Insert datum after the last Node in this NodeSet

# File lib/nokogiri/xml/node_set.rb, line 69
def after(datum)
  last.after(datum)
end

append_class(name) click to toggle source

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

See Nokogiri::XML::Node#append_class for more information.

# File lib/nokogiri/xml/node_set.rb, line 151
def append_class(name)
  each do |el|
    el.append_class(name)
  end
  self
end

search *paths, [namespace-bindings, xpath-variable-bindings, custom-handler-class] click to toggle source

Search this object for paths, and return only the first result. paths must be one or more XPath or CSS queries.

See Searchable#search for more information.

Or, if passed an integer, index into the NodeSet:

node_set.at(3) # same as node_set[3]

Calls superclass method Nokogiri::XML::Searchable#at

# File lib/nokogiri/xml/node_set.rb, line 119
def at(*args)
  if args.length == 1 && args.first.is_a?(Numeric)
    return self[args.first]
  end

  super(*args)
end

Also aliased as: %

attr(key, value = nil) { |node| ... } click to toggle source

Set attributes on each Node in the NodeSet, or get an attribute from the first Node in the NodeSet.

To get an attribute from the first Node in a NodeSet:

node_set.attr("href") # => "https://www.nokogiri.org"

Note that an empty NodeSet will return nil when #attr is called as a getter.

To set an attribute on each node, key can either be an attribute name, or a Hash of attribute names and values. When called as a setter, #attr returns the NodeSet.

If key is an attribute name, then either value or block must be passed.

If key is a Hash then attributes will be set for each key/value pair:

node_set.attr("href" => "https://www.nokogiri.org", "class" => "member")

If value is passed, it will be used as the attribute value for all nodes:

node_set.attr("href", "https://www.nokogiri.org")

If block is passed, it will be called on each Node object in the NodeSet and the return value used as the attribute value for that node:

node_set.attr("class") { |node| node.name }

# File lib/nokogiri/xml/node_set.rb, line 203
def attr(key, value = nil, &block)
  unless key.is_a?(Hash) || (key && (value || block))
    return first&.attribute(key)
  end

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

  hash.each do |k, v|
    each do |node|
      node[k] = v || yield(node)
    end
  end

  self
end

Also aliased as: set, attribute

attribute(key, value = nil, &block)

Alias for: attr

before(datum) click to toggle source

Insert datum before the first Node in this NodeSet

# File lib/nokogiri/xml/node_set.rb, line 63
def before(datum)
  first.before(datum)
end

children() click to toggle source

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

# File lib/nokogiri/xml/node_set.rb, line 406
def children
  node_set = NodeSet.new(document)
  each do |node|
    node.children.each { |n| node_set.push(n) }
  end
  node_set
end

dup

Alias for: dup

css *rules, [namespace-bindings, custom-pseudo-class] click to toggle source

Search this node set for CSS rules. rules must be one or more CSS selectors. For example:

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

# File lib/nokogiri/xml/node_set.rb, line 83
def css(*args)
  rules, handler, ns, _ = extract_params(args)
  paths = css_rules_to_xpath(rules, ns)

  inject(NodeSet.new(document)) do |set, node|
    set + xpath_internal(node, paths, handler, ns, nil)
  end
end

deconstruct() → Array click to toggle source

Returns the members of this NodeSet as an array, to use in pattern matching.

⚡ This is an experimental feature, available since v1.14.0

# File lib/nokogiri/xml/node_set.rb, line 440
def deconstruct
  to_a
end

delete(node) click to toggle source

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

static VALUE
delete (VALUE rb_self, VALUE rb_node)
{
  xmlNodeSetPtr c_self;
  xmlNodePtr node;

  Check_Node_Set_Node_Type(rb_node);

  TypedData_Get_Struct(rb_self, xmlNodeSet, &xml_node_set_type, c_self);
  Noko_Node_Get_Struct(rb_node, xmlNode, node);

  if (xmlXPathNodeSetContains(c_self, node)) {
    xpath_node_set_del(c_self, node);
    return rb_node;
  }
  return Qnil ;
}

dup click to toggle source

Duplicate this NodeSet. Note that the Nodes contained in the NodeSet are not duplicated (similar to how Array and other Enumerable classes work).

static VALUE
duplicate(VALUE rb_self)
{
  xmlNodeSetPtr c_self;
  xmlNodeSetPtr dupl;

  TypedData_Get_Struct(rb_self, xmlNodeSet, &xml_node_set_type, c_self);

  dupl = xmlXPathNodeSetMerge(NULL, c_self);

  return noko_xml_node_set_wrap(dupl, rb_iv_get(rb_self, "@document"));
}

Also aliased as: clone

each() { |self| ... } click to toggle source

Iterate over each node, yielding to block

# File lib/nokogiri/xml/node_set.rb, line 231
def each
  return to_enum unless block_given?

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

empty?() click to toggle source

Is this NodeSet empty?

# File lib/nokogiri/xml/node_set.rb, line 45
def empty?
  length == 0
end

filter(expr) click to toggle source

Filter this list for nodes that match expr

# File lib/nokogiri/xml/node_set.rb, line 130
def filter(expr)
  find_all { |node| node.matches?(expr) }
end

first(n = nil) click to toggle source

Get the first element of the NodeSet.

# File lib/nokogiri/xml/node_set.rb, line 29
def first(n = nil)
  return self[0] unless n

  list = []
  [n, length].min.times { |i| list << self[i] }
  list
end

include?(node) click to toggle source

Returns true if any member of node set equals node.

static VALUE
include_eh(VALUE rb_self, VALUE rb_node)
{
  xmlNodeSetPtr c_self;
  xmlNodePtr node;

  Check_Node_Set_Node_Type(rb_node);

  TypedData_Get_Struct(rb_self, xmlNodeSet, &xml_node_set_type, c_self);
  Noko_Node_Get_Struct(rb_node, xmlNode, node);

  return (xmlXPathNodeSetContains(c_self, node) ? Qtrue : Qfalse);
}

index(node = nil) { |member| ... } click to toggle source

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

# File lib/nokogiri/xml/node_set.rb, line 51
def index(node = nil)
  if node
    warn("given block not used") if block_given?
    each_with_index { |member, j| return j if member == node }
  elsif block_given?
    each_with_index { |member, j| return j if yield(member) }
  end
  nil
end

inner_html(*args) click to toggle source

Get the inner html of all contained Node objects

# File lib/nokogiri/xml/node_set.rb, line 260
def inner_html(*args)
  collect { |j| j.inner_html(*args) }.join("")
end

inner_text() click to toggle source

Get the inner text of all contained Node objects

Note: This joins the text of all Node objects in the NodeSet:

doc = Nokogiri::XML('<xml><a><d>foo</d><d>bar</d></a></xml>')
doc.css('d').text # => "foobar"

Instead, if you want to return the text of all nodes in the NodeSet:

doc.css('d').map(&:text) # => ["foo", "bar"]

See Nokogiri::XML::Node#content for more information.

# File lib/nokogiri/xml/node_set.rb, line 253
def inner_text
  collect(&:inner_text).join("")
end

Also aliased as: text

inspect() click to toggle source

Return a nicely formated string representation

# File lib/nokogiri/xml/node_set.rb, line 427
def inspect
  "[#{map(&:inspect).join(", ")}]"
end

last() click to toggle source

Get the last element of the NodeSet.

# File lib/nokogiri/xml/node_set.rb, line 39
def last
  self[-1]
end

length click to toggle source

Get the length of the node set

static VALUE
length(VALUE rb_self)
{
  xmlNodeSetPtr c_self;

  TypedData_Get_Struct(rb_self, xmlNodeSet, &xml_node_set_type, c_self);

  return c_self ? INT2NUM(c_self->nodeNr) : INT2NUM(0);
}

Also aliased as: size

pop() click to toggle source

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

# File lib/nokogiri/xml/node_set.rb, line 374
def pop
  return nil if length == 0

  delete(last)
end

push(node) click to toggle source

Append node to the NodeSet.

static VALUE
push(VALUE rb_self, VALUE rb_node)
{
  xmlNodeSetPtr c_self;
  xmlNodePtr node;

  Check_Node_Set_Node_Type(rb_node);

  TypedData_Get_Struct(rb_self, xmlNodeSet, &xml_node_set_type, c_self);
  Noko_Node_Get_Struct(rb_node, xmlNode, node);

  xmlXPathNodeSetAdd(c_self, node);

  return rb_self;
}

Also aliased as: <<

unlink

Alias for: unlink

remove_attr(name) click to toggle source

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

# File lib/nokogiri/xml/node_set.rb, line 223
def remove_attr(name)
  each { |el| el.delete(name) }
  self
end

Also aliased as: remove_attribute

remove_attribute(name)

Alias for: remove_attr

remove_class(name = nil) click to toggle source

Remove the class attribute name from all Node objects in the NodeSet.

See Nokogiri::XML::Node#remove_class for more information.

# File lib/nokogiri/xml/node_set.rb, line 163
def remove_class(name = nil)
  each do |el|
    el.remove_class(name)
  end
  self
end

reverse() click to toggle source

Returns a new NodeSet containing all the nodes in the NodeSet in reverse order

# File lib/nokogiri/xml/node_set.rb, line 417
def reverse
  node_set = NodeSet.new(document)
  (length - 1).downto(0) do |x|
    node_set.push(self[x])
  end
  node_set
end

set(key, value = nil, &block)

Alias for: attr

shift() click to toggle source

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

# File lib/nokogiri/xml/node_set.rb, line 383
def shift
  return nil if length == 0

  delete(first)
end

length

Alias for: length

slice(index) → Node or nil

slice(start, length) → NodeSet or nil

slice(range) → NodeSet or nil

Alias for: []

text()

Alias for: inner_text

to_a click to toggle source

Return this list as an Array

static VALUE
to_array(VALUE rb_self)
{
  xmlNodeSetPtr c_self ;
  VALUE list;
  int i;

  TypedData_Get_Struct(rb_self, xmlNodeSet, &xml_node_set_type, c_self);

  list = rb_ary_new2(c_self->nodeNr);
  for (i = 0; i < c_self->nodeNr; i++) {
    VALUE elt = noko_xml_node_wrap_node_set_result(c_self->nodeTab[i], rb_self);
    rb_ary_push(list, elt);
  }

  return list;
}

Also aliased as: to_ary

to_a

Alias for: to_a

to_html(*args) click to toggle source

Convert this NodeSet to HTML

# File lib/nokogiri/xml/node_set.rb, line 341
def to_html(*args)
  if Nokogiri.jruby?
    options = args.first.is_a?(Hash) ? args.shift : {}
    options[:save_with] ||= Node::SaveOptions::DEFAULT_HTML
    args.insert(0, options)
  end
  if empty?
    encoding = (args.first.is_a?(Hash) ? args.first[:encoding] : nil)
    encoding ||= document.encoding
    encoding.nil? ? "" : "".encode(encoding)
  else
    map { |x| x.to_html(*args) }.join
  end
end

to_s() click to toggle source

Convert this NodeSet to a string.

# File lib/nokogiri/xml/node_set.rb, line 335
def to_s
  map(&:to_s).join
end

to_xhtml(*args) click to toggle source

Convert this NodeSet to XHTML

# File lib/nokogiri/xml/node_set.rb, line 358
def to_xhtml(*args)
  map { |x| x.to_xhtml(*args) }.join
end

to_xml(*args) click to toggle source

Convert this NodeSet to XML

# File lib/nokogiri/xml/node_set.rb, line 364
def to_xml(*args)
  map { |x| x.to_xml(*args) }.join
end

unlink click to toggle source

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

static VALUE
unlink_nodeset(VALUE rb_self)
{
  xmlNodeSetPtr c_self;
  int j, nodeNr ;

  TypedData_Get_Struct(rb_self, xmlNodeSet, &xml_node_set_type, c_self);

  nodeNr = c_self->nodeNr ;
  for (j = 0 ; j < nodeNr ; j++) {
    if (! NOKOGIRI_NAMESPACE_EH(c_self->nodeTab[j])) {
      VALUE node ;
      xmlNodePtr node_ptr;
      node = noko_xml_node_wrap(Qnil, c_self->nodeTab[j]);
      rb_funcall(node, rb_intern("unlink"), 0); /* modifies the C struct out from under the object */
      Noko_Node_Get_Struct(node, xmlNode, node_ptr);
      c_self->nodeTab[j] = node_ptr ;
    }
  }
  return rb_self ;
}

Also aliased as: remove

wrap(markup) → self click to toggle source

wrap(node) → self

Wrap each member of this NodeSet with the node parsed from markup or a dup of the node.

Parameters

markup (String) Markup that is parsed, once per member of the NodeSet, and used as the wrapper. Each node’s parent, if it exists, is used as the context node for parsing; otherwise the associated document is used. If the parsed fragment has multiple roots, the first root node is used as the wrapper.
node (Nokogiri::XML::Node) An element that is ‘#dup`ed and used as the wrapper.

Returns: self, to support chaining.

⚠ Note that if a String is passed, the markup will be parsed once per node in the NodeSet. You can avoid this overhead in cases where you know exactly the wrapper you wish to use by passing a Node instead.

Also see Node#wrap

Example with a String argument:

doc = Nokogiri::HTML5(<<~HTML)
  <html><body>
    <a>a</a>
    <a>b</a>
    <a>c</a>
    <a>d</a>
  </body></html>
HTML
doc.css("a").wrap("<div></div>")
doc.to_html
# => <html><head></head><body>
#      <div><a>a</a></div>
#      <div><a>b</a></div>
#      <div><a>c</a></div>
#      <div><a>d</a></div>
#    </body></html>

Example with a Node argument

💡 Note that this is faster than the equivalent call passing a String because it avoids having to reparse the wrapper markup for each node.

doc = Nokogiri::HTML5(<<~HTML)
  <html><body>
    <a>a</a>
    <a>b</a>
    <a>c</a>
    <a>d</a>
  </body></html>
HTML
doc.css("a").wrap(doc.create_element("div"))
doc.to_html
# => <html><head></head><body>
#      <div><a>a</a></div>
#      <div><a>b</a></div>
#      <div><a>c</a></div>
#      <div><a>d</a></div>
#    </body></html>

# File lib/nokogiri/xml/node_set.rb, line 328
def wrap(node_or_tags)
  map { |node| node.wrap(node_or_tags) }
  self
end

xpath *paths, [namespace-bindings, variable-bindings, custom-handler-class] click to toggle source

Search this node set for XPath paths. paths must be one or more XPath queries.

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

# File lib/nokogiri/xml/node_set.rb, line 99
def xpath(*args)
  paths, handler, ns, binds = extract_params(args)

  inject(NodeSet.new(document)) do |set, node|
    set + xpath_internal(node, paths, handler, ns, binds)
  end
end

|(node_set) click to toggle source

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

static VALUE
rb_xml_node_set_union(VALUE rb_self, VALUE rb_other)
{
  xmlNodeSetPtr c_self, c_other;
  xmlNodeSetPtr c_new_node_set;

  if (!rb_obj_is_kind_of(rb_other, cNokogiriXmlNodeSet)) {
    rb_raise(rb_eArgError, "node_set must be a Nokogiri::XML::NodeSet");
  }

  TypedData_Get_Struct(rb_self, xmlNodeSet, &xml_node_set_type, c_self);
  TypedData_Get_Struct(rb_other, xmlNodeSet, &xml_node_set_type, c_other);

  c_new_node_set = xmlXPathNodeSetMerge(NULL, c_self);
  c_new_node_set = xmlXPathNodeSetMerge(c_new_node_set, c_other);

  return noko_xml_node_set_wrap(c_new_node_set, rb_iv_get(rb_self, "@document"));
}

Also aliased as: +

Searching via XPath or CSS Queries

↑ top

Public Instance Methods

/(*args)

Included from Nokogiri::XML::Searchable

Alias for: search

>(selector) → NodeSet click to toggle source

Included from Nokogiri::XML::Searchable

Search this node’s immediate children using CSS selector selector

# File lib/nokogiri/xml/searchable.rb, line 201
def >(selector) # rubocop:disable Naming/BinaryOperatorParameterName
  ns = (document.root&.namespaces || {})
  xpath(CSS.xpath_for(selector, prefix: "./", ns: ns).first)
end

at_css(*rules, [namespace-bindings, custom-pseudo-class]) click to toggle source

Included from Nokogiri::XML::Searchable

Search this object for CSS rules, and return only the first match. rules must be one or more CSS selectors.

See Searchable#css for more information.

# File lib/nokogiri/xml/searchable.rb, line 143
def at_css(*args)
  css(*args).first
end

at_xpath(*paths, [namespace-bindings, variable-bindings, custom-handler-class]) click to toggle source

Included from Nokogiri::XML::Searchable

Search this node for XPath paths, and return only the first match. paths must be one or more XPath queries.

See Searchable#xpath for more information.

# File lib/nokogiri/xml/searchable.rb, line 193
def at_xpath(*args)
  xpath(*args).first
end

search(*paths, [namespace-bindings, xpath-variable-bindings, custom-handler-class]) click to toggle source

Included from Nokogiri::XML::Searchable

Search this object for paths. paths must be one or more XPath or CSS queries:

node.search("div.employee", ".//title")

A hash of namespace bindings may be appended:

node.search('.//bike:tire', {'bike' => 'http://schwinn.com/'})
node.search('bike|tire', {'bike' => 'http://schwinn.com/'})

For XPath queries, a hash of variable bindings may also be appended to the namespace bindings. For example:

node.search('.//address[@domestic=$value]', nil, {:value => 'Yes'})

💡 Custom XPath functions and CSS pseudo-selectors may also be defined. To define custom functions create a class and implement the function you want to define, which will be in the ‘nokogiri` namespace in XPath queries.

The first argument to the method will be the current matching NodeSet. Any other arguments are ones that you pass in. Note that this class may appear anywhere in the argument list. For example:

handler = Class.new {
  def regex node_set, regex
    node_set.find_all { |node| node['some_attribute'] =~ /#{regex}/ }
  end
}.new
node.search('.//title[nokogiri:regex(., "\w+")]', 'div.employee:regex("[0-9]+")', handler)

See Searchable#xpath and Searchable#css for further usage help.

# File lib/nokogiri/xml/searchable.rb, line 54
def search(*args)
  paths, handler, ns, binds = extract_params(args)

  xpaths = paths.map(&:to_s).map do |path|
    LOOKS_LIKE_XPATH.match?(path) ? path : xpath_query_from_css_rule(path, ns)
  end.flatten.uniq

  xpath(*(xpaths + [ns, handler, binds].compact))
end

Also aliased as: /