Class: Nokogiri::XML::NodeSet

Inherits:
Object
  • Object
show all
Includes:
Enumerable, Searchable
Defined in:
lib/nokogiri/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::Searchable#css or Nokogiri::XML::Searchable#xpath

Constant Summary collapse

IMPLIED_XPATH_CONTEXTS = 
[ './/'.freeze, 'self::'.freeze ].freeze

Instance Attribute Summary collapse

Searching via XPath or CSS Queries collapse

Instance Method Summary collapse

Constructor Details

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

Create a NodeSet with document defaulting to list

Yields:

  • (_self)

Yield Parameters:



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# File 'lib/nokogiri/xml/node_set.rb', line 18

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

Instance Attribute Details

#document ⇒ Object

The Document this NodeSet is associated with



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

def document
  @document
end

Instance Method Details

#&(node_set) ⇒ Object

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



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# File 'ext/nokogiri/xml_node_set.c', line 136

static VALUE intersection(VALUE self, VALUE rb_other)
{
  xmlNodeSetPtr node_set, other ;
  xmlNodeSetPtr intersection;

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

  Data_Get_Struct(self, xmlNodeSet, node_set);
  Data_Get_Struct(rb_other, xmlNodeSet, other);

  intersection = xmlXPathIntersection(node_set, other);
  return Nokogiri_wrap_xml_node_set(intersection, rb_iv_get(self, "@document"));
}

#-(node_set) ⇒ Object

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

each item that also appears in +node_set+



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# File 'ext/nokogiri/xml_node_set.c', line 203

static VALUE minus(VALUE self, VALUE rb_other)
{
  xmlNodeSetPtr node_set, 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");

  Data_Get_Struct(self, xmlNodeSet, node_set);
  Data_Get_Struct(rb_other, xmlNodeSet, other);

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

  return Nokogiri_wrap_xml_node_set(new, rb_iv_get(self, "@document"));
}

#==(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



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# File 'lib/nokogiri/xml/node_set.rb', line 328

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

#>(selector) ⇒ Object

Search this NodeSet's nodes' immediate children using CSS selector selector



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# File 'lib/nokogiri/xml/node_set.rb', line 106

def > selector
  ns = document.root.namespaces
  xpath CSS.xpath_for(selector, :prefix => "./", :ns => ns).first
end

#[](*args) ⇒ Object

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.



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# File 'ext/nokogiri/xml_node_set.c', line 276

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

  Data_Get_Struct(self, xmlNodeSet, node_set);

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

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

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

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

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

#add_class(name) ⇒ Object

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

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



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

def add_class name
  each do |el|
    el.add_class(name)
  end
  self
end

#after(datum) ⇒ Object

Insert datum after the last Node in this NodeSet



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# File 'lib/nokogiri/xml/node_set.rb', line 66

def after datum
  last.after datum
end

#append_class(name) ⇒ Object

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

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



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# File 'lib/nokogiri/xml/node_set.rb', line 155

def append_class name
  each do |el|
    el.append_class(name)
  end
  self
end

#at(*args) ⇒ Object Also known as: %

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

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]



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# File 'lib/nokogiri/xml/node_set.rb', line 123

def at *args
  if args.length == 1 && args.first.is_a?(Numeric)
    return self[args.first]
  end

  super(*args)
end

#at_css(*args) ⇒ Object Originally defined in module Searchable

call-seq: css *rules, [namespace-bindings, custom-pseudo-class]

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.

#at_xpath(*args) ⇒ Object Originally defined in module Searchable

call-seq: xpath *paths, [namespace-bindings, variable-bindings, custom-handler-class]

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.

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

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 }



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# File 'lib/nokogiri/xml/node_set.rb', line 207

def attr key, value = nil, &block
  unless key.is_a?(Hash) || (key && (value || block))
    return first ? first.attribute(key) : nil
  end

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

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

  self
end

#before(datum) ⇒ Object

Insert datum before the first Node in this NodeSet



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

def before datum
  first.before datum
end

#children ⇒ Object

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



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# File 'lib/nokogiri/xml/node_set.rb', line 340

def children
  node_set = NodeSet.new(document)
  each do |node|
    node.children.each { |n| node_set.push(n) }
  end
  node_set
end

#css(*args) ⇒ Object

call-seq: css *rules, [namespace-bindings, custom-pseudo-class]

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



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

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

#delete(node) ⇒ Object

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



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# File 'ext/nokogiri/xml_node_set.c', line 111

static VALUE
delete(VALUE self, VALUE rb_node)
{
  xmlNodeSetPtr node_set;
  xmlNodePtr node;

  Check_Node_Set_Node_Type(rb_node);

  Data_Get_Struct(self, xmlNodeSet, node_set);
  Data_Get_Struct(rb_node, xmlNode, node);

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

#dup ⇒ Object Also known as: clone

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



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# File 'ext/nokogiri/xml_node_set.c', line 56

static VALUE duplicate(VALUE self)
{
  xmlNodeSetPtr node_set;
  xmlNodeSetPtr dupl;

  Data_Get_Struct(self, xmlNodeSet, node_set);

  dupl = xmlXPathNodeSetMerge(NULL, node_set);

  return Nokogiri_wrap_xml_node_set(dupl, rb_iv_get(self, "@document"));
}

#each ⇒ Object

Iterate over each node, yielding to block



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# File 'lib/nokogiri/xml/node_set.rb', line 235

def each
  return to_enum unless block_given?

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

#empty? ⇒ Boolean

Is this NodeSet empty?

Returns:

  • (Boolean) 


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# File 'lib/nokogiri/xml/node_set.rb', line 42

def empty?
  length == 0
end

#filter(expr) ⇒ Object

Filter this list for nodes that match expr



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# File 'lib/nokogiri/xml/node_set.rb', line 134

def filter expr
  find_all { |node| node.matches?(expr) }
end

#first(n = nil) ⇒ Object

Get the first element of the NodeSet.



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# File 'lib/nokogiri/xml/node_set.rb', line 27

def first n = nil
  return self[0] unless n
  list = []
  [n, length].min.times { |i| list << self[i] }
  list
end

#include?(node) ⇒ Boolean

Returns true if any member of node set equals node.

Returns:

  • (Boolean) 


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# File 'ext/nokogiri/xml_node_set.c', line 158

static VALUE include_eh(VALUE self, VALUE rb_node)
{
  xmlNodeSetPtr node_set;
  xmlNodePtr node;

  Check_Node_Set_Node_Type(rb_node);

  Data_Get_Struct(self, xmlNodeSet, node_set);
  Data_Get_Struct(rb_node, xmlNode, node);

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

#index(node = nil) ⇒ Object

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.



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

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) ⇒ Object

Get the inner html of all contained Node objects



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# File 'lib/nokogiri/xml/node_set.rb', line 264

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

#inner_text ⇒ Object Also known as: text

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.



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

def inner_text
  collect(&:inner_text).join('')
end

#inspect ⇒ Object

Return a nicely formated string representation



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# File 'lib/nokogiri/xml/node_set.rb', line 361

def inspect
  "[#{map(&:inspect).join ', '}]"
end

#last ⇒ Object

Get the last element of the NodeSet.



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# File 'lib/nokogiri/xml/node_set.rb', line 36

def last
  self[-1]
end

#length ⇒ Object Also known as: size

Get the length of the node set



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# File 'ext/nokogiri/xml_node_set.c', line 74

static VALUE length(VALUE self)
{
  xmlNodeSetPtr node_set;

  Data_Get_Struct(self, xmlNodeSet, node_set);

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

#pop ⇒ Object

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



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# File 'lib/nokogiri/xml/node_set.rb', line 311

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

#push(node) ⇒ Object Also known as: <<

Append node to the NodeSet.



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# File 'ext/nokogiri/xml_node_set.c', line 89

static VALUE push(VALUE self, VALUE rb_node)
{
  xmlNodeSetPtr node_set;
  xmlNodePtr node;

  Check_Node_Set_Node_Type(rb_node);

  Data_Get_Struct(self, xmlNodeSet, node_set);
  Data_Get_Struct(rb_node, xmlNode, node);

  xmlXPathNodeSetAdd(node_set, node);

  return self;
}

#remove_attr(name) ⇒ Object Also known as: remove_attribute

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



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# File 'lib/nokogiri/xml/node_set.rb', line 227

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.

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



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# File 'lib/nokogiri/xml/node_set.rb', line 167

def remove_class name = nil
  each do |el|
    el.remove_class(name)
  end
  self
end

#reverse ⇒ Object

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



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# File 'lib/nokogiri/xml/node_set.rb', line 351

def reverse
  node_set = NodeSet.new(document)
  (length - 1).downto(0) do |x|
    node_set.push self[x]
  end
  node_set
end

#search(*args) ⇒ Object Also known as: / Originally defined in module Searchable

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

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. 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:

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

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

#shift ⇒ Object

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



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# File 'lib/nokogiri/xml/node_set.rb', line 319

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

#slice(*args) ⇒ Object

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.



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# File 'ext/nokogiri/xml_node_set.c', line 276

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

  Data_Get_Struct(self, xmlNodeSet, node_set);

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

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

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

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

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

#to_a ⇒ Object Also known as: to_ary

Return this list as an Array



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# File 'ext/nokogiri/xml_node_set.c', line 322

static VALUE to_array(VALUE self)
{
  xmlNodeSetPtr node_set ;
  VALUE list;
  int i;

  Data_Get_Struct(self, xmlNodeSet, node_set);

  list = rb_ary_new2(node_set->nodeNr);
  for(i = 0; i < node_set->nodeNr; i++) {
    VALUE elt = Nokogiri_wrap_xml_node_set_node(node_set->nodeTab[i], self);
    rb_ary_push( list, elt );
  }

  return list;
}

#to_html(*args) ⇒ Object

Convert this NodeSet to HTML



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# File 'lib/nokogiri/xml/node_set.rb', line 282

def to_html *args
  if Nokogiri.jruby?
    options = args.first.is_a?(Hash) ? args.shift : {}
    if !options[:save_with]
      options[:save_with] = Node::SaveOptions::NO_DECLARATION | Node::SaveOptions::NO_EMPTY_TAGS | Node::SaveOptions::AS_HTML
    end
    args.insert(0, options)
  end
  map { |x| x.to_html(*args) }.join
end

#to_s ⇒ Object

Convert this NodeSet to a string.



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

def to_s
  map(&:to_s).join
end

#to_xhtml(*args) ⇒ Object

Convert this NodeSet to XHTML



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

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

#to_xml(*args) ⇒ Object

Convert this NodeSet to XML



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

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

#unlink ⇒ Object Also known as: remove

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



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# File 'ext/nokogiri/xml_node_set.c', line 345

static VALUE unlink_nodeset(VALUE self)
{
  xmlNodeSetPtr node_set;
  int j, nodeNr ;

  Data_Get_Struct(self, xmlNodeSet, node_set);

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

#wrap(html) ⇒ Object

Wrap this NodeSet with html



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# File 'lib/nokogiri/xml/node_set.rb', line 270

def wrap html
  map { |node| node.wrap html }
end

#xpath(*args) ⇒ Object

call-seq: xpath *paths, [namespace-bindings, variable-bindings, custom-handler-class]

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

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



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# File 'lib/nokogiri/xml/node_set.rb', line 96

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) ⇒ Object Also known as: +

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



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# File 'ext/nokogiri/xml_node_set.c', line 179

static VALUE set_union(VALUE self, VALUE rb_other)
{
  xmlNodeSetPtr node_set, other;
  xmlNodeSetPtr new;

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

  Data_Get_Struct(self, xmlNodeSet, node_set);
  Data_Get_Struct(rb_other, xmlNodeSet, other);

  new = xmlXPathNodeSetMerge(NULL, node_set);
  new = xmlXPathNodeSetMerge(new, other);

  return Nokogiri_wrap_xml_node_set(new, rb_iv_get(self, "@document"));
}