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 =

:nodoc:

[".//", "self::"].freeze

Constants included from Searchable

Searchable::LOOKS_LIKE_XPATH

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Searchable

#>, #at_css, #at_xpath, #search

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 20

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 15

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 196

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 noko_xml_node_set_wrap(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 268

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 noko_xml_node_set_wrap(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 392

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

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 345

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 139

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 69

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 151

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 119

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

  super(*args)
end

#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 203

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 || yield(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 63

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 405

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 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

#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 171

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);
  Noko_Node_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 113

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

  Data_Get_Struct(self, xmlNodeSet, node_set);

  dupl = xmlXPathNodeSetMerge(NULL, node_set);

  return noko_xml_node_set_wrap(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 231

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 45

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 130

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 29

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 220

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);
  Noko_Node_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 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) ⇒ Object

Get the inner html of all contained Node objects


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

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 253

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 426

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 39

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 132

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 373

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 148

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);
  Noko_Node_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 223

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 163

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 416

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

#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 382

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 345

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 392

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 = noko_xml_node_wrap_node_set_result(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 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) || document.encoding
    "".encode(encoding)
  else
    map { |x| x.to_html(*args) }.join
  end
end

#to_s ⇒ Object

Convert this NodeSet to a string.


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# File 'lib/nokogiri/xml/node_set.rb', line 335

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 357

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 363

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 416

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 = noko_xml_node_wrap(Qnil, node_set->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);
      node_set->nodeTab[j] = node_ptr ;
    }
  }
  return self ;
}

#wrap(node_or_tags) ⇒ Object

:call-seq:

wrap(markup) -> self
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>


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

def wrap(node_or_tags)
  map { |node| node.wrap(node_or_tags) }
  self
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 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) ⇒ 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 242

static VALUE
rb_xml_node_set_union(VALUE rb_node_set, VALUE rb_other)
{
  xmlNodeSetPtr c_node_set, 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");
  }

  Data_Get_Struct(rb_node_set, xmlNodeSet, c_node_set);
  Data_Get_Struct(rb_other, xmlNodeSet, c_other);

  c_new_node_set = xmlXPathNodeSetMerge(NULL, c_node_set);
  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_node_set, "@document"));
}