Class: Nokogiri::XML::Node

Inherits:
Object
  • Object
show all
Includes:
Enumerable, HTML5::Node, PP::Node, Searchable
Defined in:
lib/nokogiri/xml/node.rb,
lib/nokogiri/xml/node/save_options.rb,
ext/nokogiri/xml_node.c

Overview

Node is your window to the fun filled world of dealing with XML and HTML tags. A Node may be treated similarly to a hash with regard to attributes. For example:

node = Nokogiri::XML::DocumentFragment.parse("<a href='#foo' id='link'>link</a>").at_css("a")
node.to_html # => "<a href=\"#foo\" id=\"link\">link</a>"
node['href'] # => "#foo"
node.keys # => ["href", "id"]
node.values # => ["#foo", "link"]
node['class'] = 'green' # => "green"
node.to_html # => "<a href=\"#foo\" id=\"link\" class=\"green\">link</a>"

See the method group entitled “Working With Node Attributes” for the full set of methods.

Node also has methods that let you move around your tree. For navigating your tree, see:

When printing or otherwise emitting a document or a node (and its subtree), there are a few methods you might want to use:

  • #content, #text, #inner_text, #to_str: These methods will all emit plaintext, meaning that entities will be replaced (e.g., “&lt;” will be replaced with “<”), meaning that any sanitizing will likely be un-done in the output.

  • #to_s, #to_xml, #to_html, #inner_html: These methods will all emit properly-escaped markup, meaning that it’s suitable for consumption by browsers, parsers, etc.

You may search this node’s subtree using Searchable#xpath and Searchable#css

Defined Under Namespace

Classes: SaveOptions

Constant Summary collapse

ELEMENT_NODE =

Element node type, see #element?

1
ATTRIBUTE_NODE =

Attribute node type

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TEXT_NODE =

Text node type, see #text?

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CDATA_SECTION_NODE =

CDATA node type, see #cdata?

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ENTITY_REF_NODE =

Entity reference node type

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ENTITY_NODE =

Entity node type

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PI_NODE =

PI node type

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COMMENT_NODE =

Comment node type, see #comment?

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DOCUMENT_NODE =

Document node type, see #xml?

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DOCUMENT_TYPE_NODE =

Document type node type

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DOCUMENT_FRAG_NODE =

Document fragment node type

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NOTATION_NODE =

Notation node type

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HTML_DOCUMENT_NODE =

HTML document node type, see #html?

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DTD_NODE =

DTD node type

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ELEMENT_DECL =

Element declaration type

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ATTRIBUTE_DECL =

Attribute declaration type

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ENTITY_DECL =

Entity declaration type

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NAMESPACE_DECL =

Namespace declaration type

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XINCLUDE_START =

XInclude start type

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XINCLUDE_END =

XInclude end type

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DOCB_DOCUMENT_NODE =

DOCB document node type

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Constants included from Searchable

Searchable::LOOKS_LIKE_XPATH

Searching via XPath or CSS Queries collapse

Manipulating Document Structure collapse

Working With Node Attributes collapse

Serialization and Generating Output collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Searchable

#at, #at_css, #at_xpath, #css, #search, #xpath

Methods included from PP::Node

#inspect, #pretty_print

Constructor Details

#initialize(name, document) {|node| ... } ⇒ Nokogiri::XML::Node

Create a new node with name sharing GC lifecycle with document.

Parameters:

Yield Parameters:

See Also:



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# File 'lib/nokogiri/xml/node.rb', line 98

def initialize(name, document)
  # This is intentionally empty.
end

Class Method Details

.new(name, document) {|node| ... } ⇒ Nokogiri::XML::Node

Create a new node with name sharing GC lifecycle with document.

Parameters:

Yield Parameters:

Returns:

See Also:



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# File 'ext/nokogiri/xml_node.c', line 1456

static VALUE
rb_xml_node_new(int argc, VALUE *argv, VALUE klass)
{
  xmlDocPtr doc;
  xmlNodePtr node;
  VALUE name;
  VALUE document;
  VALUE rest;
  VALUE rb_node;

  rb_scan_args(argc, argv, "2*", &name, &document, &rest);

  Data_Get_Struct(document, xmlDoc, doc);

  node = xmlNewNode(NULL, (xmlChar *)StringValueCStr(name));
  node->doc = doc->doc;
  noko_xml_document_pin_node(node);

  rb_node = noko_xml_node_wrap(
              klass == cNokogiriXmlNode ? (VALUE)NULL : klass,
              node
            );
  rb_obj_call_init(rb_node, argc, argv);

  if (rb_block_given_p()) { rb_yield(rb_node); }

  return rb_node;
}

Instance Method Details

#<<(node_or_tags) ⇒ Object

Add node_or_tags as a child of this Node. node_or_tags can be a Nokogiri::XML::Node, a ::DocumentFragment, a ::NodeSet, or a string containing markup.

Returns self, to support chaining of calls (e.g., root << child1 << child2)

Also see related method add_child.



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# File 'lib/nokogiri/xml/node.rb', line 173

def <<(node_or_tags)
  add_child node_or_tags
  self
end

#<=>(other) ⇒ Object

Compare two Node objects with respect to their Document. Nodes from different documents cannot be compared.



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# File 'lib/nokogiri/xml/node.rb', line 999

def <=>(other)
  return nil unless other.is_a?(Nokogiri::XML::Node)
  return nil unless document == other.document
  compare other
end

#==(other) ⇒ Object

Test to see if this Node is equal to other



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# File 'lib/nokogiri/xml/node.rb', line 990

def ==(other)
  return false unless other
  return false unless other.respond_to?(:pointer_id)
  pointer_id == other.pointer_id
end

#>(selector) ⇒ Object

Search this node’s immediate children using CSS selector selector



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# File 'lib/nokogiri/xml/node.rb', line 112

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

#[](name) ⇒ Object Also known as: get_attribute, attr

Get the attribute value for the attribute name



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# File 'lib/nokogiri/xml/node.rb', line 380

def [](name)
  get(name.to_s)
end

#[]=(name, value) ⇒ Object Also known as: set_attribute

Set the attribute value for the attribute name to value



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# File 'lib/nokogiri/xml/node.rb', line 386

def []=(name, value)
  set name.to_s, value.to_s
end

#accept(visitor) ⇒ Object

Accept a visitor. This method calls “visit” on visitor with self.



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# File 'lib/nokogiri/xml/node.rb', line 984

def accept(visitor)
  visitor.visit(self)
end

#add_child(node_or_tags) ⇒ Object

Add node_or_tags as a child of this Node. node_or_tags can be a Nokogiri::XML::Node, a ::DocumentFragment, a ::NodeSet, or a string containing markup.

Returns the reparented node (if node_or_tags is a Node), or NodeSet (if node_or_tags is a DocumentFragment, NodeSet, or string).

Also see related method <<.



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# File 'lib/nokogiri/xml/node.rb', line 128

def add_child(node_or_tags)
  node_or_tags = coerce(node_or_tags)
  if node_or_tags.is_a?(XML::NodeSet)
    node_or_tags.each { |n| add_child_node_and_reparent_attrs n }
  else
    add_child_node_and_reparent_attrs node_or_tags
  end
  node_or_tags
end

#add_class(names) ⇒ Node

Ensure HTML CSS classes are present on a Node. Any CSS classes in names that already exist in the Node‘s class attribute are not added. Note that any existing duplicates in the class attribute are not removed. Compare with #append_class.

This is a convenience function and is equivalent to:

node.kwattr_add("class", names)

Examples:

Ensure that a Node has CSS class “section”

node                      # => <div></div>
node.add_class("section") # => <div class="section"></div>
node.add_class("section") # => <div class="section"></div> # duplicate not added

Ensure that a Node has CSS classes “section” and “header”, via a String argument.

node                             # => <div class="section section"></div>
node.add_class("section header") # => <div class="section section header"></div>
# Note that the CSS class "section" is not added because it is already present.
# Note also that the pre-existing duplicate CSS class "section" is not removed.

Ensure that a Node has CSS classes “section” and “header”, via an Array argument.

node                                  # => <div></div>
node.add_class(["section", "header"]) # => <div class="section header"></div>

Parameters:

  • names (String, Array<String>) —

    CSS class names to be added to the Node’s class attribute. May be a string containing whitespace-delimited names, or an Array of String names. Any class names already present will not be added. Any class names not present will be added. If no class attribute exists, one is created.

Returns:

  • (Node) —

    Returns self for ease of chaining method calls.

See Also:



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# File 'lib/nokogiri/xml/node.rb', line 499

def add_class(names)
  kwattr_add("class", names)
end

#add_namespace_definition(prefix, href) ⇒ Object Also known as: add_namespace

Adds a namespace definition with prefix using href value. The result is as if parsed XML for this node had included an attribute ‘xmlns:prefix=value’. A default namespace for this node (“xmlns=”) can be added by passing ‘nil’ for prefix. Namespaces added this way will not show up in #attributes, but they will be included as an xmlns attribute when the node is serialized to XML.



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# File 'ext/nokogiri/xml_node.c', line 1417

static VALUE
add_namespace_definition(VALUE rb_node, VALUE rb_prefix, VALUE rb_href)
{
  xmlNodePtr c_node, element;
  xmlNsPtr c_namespace;
  const xmlChar *c_prefix = (const xmlChar *)(NIL_P(rb_prefix) ? NULL : StringValueCStr(rb_prefix));

  Data_Get_Struct(rb_node, xmlNode, c_node);
  element = c_node ;

  c_namespace = xmlSearchNs(c_node->doc, c_node, c_prefix);

  if (!c_namespace) {
    if (c_node->type != XML_ELEMENT_NODE) {
      element = c_node->parent;
    }
    c_namespace = xmlNewNs(element, (const xmlChar *)StringValueCStr(rb_href), c_prefix);
  }

  if (!c_namespace) {
    return Qnil ;
  }

  if (NIL_P(rb_prefix) || c_node != element) {
    xmlSetNs(c_node, c_namespace);
  }

  return noko_xml_namespace_wrap(c_namespace, c_node->doc);
}

#add_next_sibling(node_or_tags) ⇒ Object Also known as: next=

Insert node_or_tags after this Node (as a sibling). node_or_tags can be a Nokogiri::XML::Node, a ::DocumentFragment, a ::NodeSet, or a string containing markup.

Returns the reparented node (if node_or_tags is a Node), or NodeSet (if node_or_tags is a DocumentFragment, NodeSet, or string).

Also see related method after.

Raises:

  • (ArgumentError) 


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# File 'lib/nokogiri/xml/node.rb', line 198

def add_next_sibling(node_or_tags)
  raise ArgumentError.new("A document may not have multiple root nodes.") if (parent && parent.document?) && !(node_or_tags.comment? || node_or_tags.processing_instruction?)

  add_sibling :next, node_or_tags
end

#add_previous_sibling(node_or_tags) ⇒ Object Also known as: previous=

Insert node_or_tags before this Node (as a sibling). node_or_tags can be a Nokogiri::XML::Node, a ::DocumentFragment, a ::NodeSet, or a string containing markup.

Returns the reparented node (if node_or_tags is a Node), or NodeSet (if node_or_tags is a DocumentFragment, NodeSet, or string).

Also see related method before.

Raises:

  • (ArgumentError) 


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# File 'lib/nokogiri/xml/node.rb', line 185

def add_previous_sibling(node_or_tags)
  raise ArgumentError.new("A document may not have multiple root nodes.") if (parent && parent.document?) && !(node_or_tags.comment? || node_or_tags.processing_instruction?)

  add_sibling :previous, node_or_tags
end

#after(node_or_tags) ⇒ Object

Insert node_or_tags after this node (as a sibling). node_or_tags can be a Nokogiri::XML::Node, a Nokogiri::XML::DocumentFragment, or a string containing markup.

Returns self, to support chaining of calls.

Also see related method add_next_sibling.



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# File 'lib/nokogiri/xml/node.rb', line 223

def after(node_or_tags)
  add_next_sibling node_or_tags
  self
end

#ancestors(selector = nil) ⇒ Object

Get a list of ancestor Node for this Node. If selector is given, the ancestors must match selector



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# File 'lib/nokogiri/xml/node.rb', line 954

def ancestors(selector = nil)
  return NodeSet.new(document) unless respond_to?(:parent)
  return NodeSet.new(document) unless parent

  parents = [parent]

  while parents.last.respond_to?(:parent)
    break unless ctx_parent = parents.last.parent
    parents << ctx_parent
  end

  return NodeSet.new(document, parents) unless selector

  root = parents.last
  search_results = root.search(selector)

  NodeSet.new(document, parents.find_all { |parent|
    search_results.include?(parent)
  })
end

#append_class(names) ⇒ Node

Add HTML CSS classes to a Node, regardless of duplication. Compare with #add_class.

This is a convenience function and is equivalent to:

node.kwattr_append("class", names)

Examples:

Append “section” to a Node‘s CSS class attriubute

node                         # => <div></div>
node.append_class("section") # => <div class="section"></div>
node.append_class("section") # => <div class="section section"></div> # duplicate added!

Append “section” and “header” to a Node‘s CSS class attribute, via a String argument.

node                                # => <div class="section section"></div>
node.append_class("section header") # => <div class="section section section header"></div>
# Note that the CSS class "section" is appended even though it is already present.

Append “section” and “header” to a Node‘s CSS class attribute, via an Array argument.

node                                     # => <div></div>
node.append_class(["section", "header"]) # => <div class="section header"></div>
node.append_class(["section", "header"]) # => <div class="section header section header"></div>

Parameters:

  • names (String, Array<String>) —

    CSS class names to be appended to the Node’s class attribute. May be a string containing whitespace-delimited names, or an Array of String names. All class names passed in will be appended to the class attribute even if they are already present in the attribute value. If no class attribute exists, one is created.

Returns:

  • (Node) —

    Returns self for ease of chaining method calls.

See Also:



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# File 'lib/nokogiri/xml/node.rb', line 540

def append_class(names)
  kwattr_append("class", names)
end

#attribute(name) ⇒ Object

Get the attribute node with name



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# File 'ext/nokogiri/xml_node.c', line 993

static VALUE
attr(VALUE self, VALUE name)
{
  xmlNodePtr node;
  xmlAttrPtr prop;
  Data_Get_Struct(self, xmlNode, node);
  prop = xmlHasProp(node, (xmlChar *)StringValueCStr(name));

  if (! prop) { return Qnil; }
  return noko_xml_node_wrap(Qnil, (xmlNodePtr)prop);
}

#attribute_nodes ⇒ Array<Nokogiri::XML::Attr>

Get the attributes for a Node

Returns:



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# File 'ext/nokogiri/xml_node.c', line 1029

static VALUE
attribute_nodes(VALUE rb_node)
{
  xmlNodePtr c_node;

  Data_Get_Struct(rb_node, xmlNode, c_node);

  return noko_xml_node_attrs(c_node);
}

#attribute_with_ns(name, namespace) ⇒ Object

Get the attribute node with name and namespace



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# File 'ext/nokogiri/xml_node.c', line 1011

static VALUE
attribute_with_ns(VALUE self, VALUE name, VALUE namespace)
{
  xmlNodePtr node;
  xmlAttrPtr prop;
  Data_Get_Struct(self, xmlNode, node);
  prop = xmlHasNsProp(node, (xmlChar *)StringValueCStr(name),
                      NIL_P(namespace) ? NULL : (xmlChar *)StringValueCStr(namespace));

  if (! prop) { return Qnil; }
  return noko_xml_node_wrap(Qnil, (xmlNodePtr)prop);
}

#attributes ⇒ Object

Returns a hash containing the node’s attributes. The key is the attribute name without any namespace, the value is a Nokogiri::XML::Attr representing the attribute. If you need to distinguish attributes with the same name, with different namespaces use #attribute_nodes instead.



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# File 'lib/nokogiri/xml/node.rb', line 396

def attributes
  attribute_nodes.each_with_object({}) do |node, hash|
    hash[node.node_name] = node
  end
end

#before(node_or_tags) ⇒ Object

Insert node_or_tags before this node (as a sibling). node_or_tags can be a Nokogiri::XML::Node, a ::DocumentFragment, a ::NodeSet, or a string containing markup.

Returns self, to support chaining of calls.

Also see related method add_previous_sibling.



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# File 'lib/nokogiri/xml/node.rb', line 211

def before(node_or_tags)
  add_previous_sibling node_or_tags
  self
end

#blank? ⇒ Boolean

Is this node blank?

Returns:

  • (Boolean) 


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# File 'ext/nokogiri/xml_node.c', line 606

static VALUE
blank_eh(VALUE self)
{
  xmlNodePtr node;
  Data_Get_Struct(self, xmlNode, node);
  return (1 == xmlIsBlankNode(node)) ? Qtrue : Qfalse ;
}

#canonicalize(mode = XML::XML_C14N_1_0, inclusive_namespaces = nil, with_comments = false) ⇒ Object 



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# File 'lib/nokogiri/xml/node.rb', line 1136

def canonicalize(mode = XML::XML_C14N_1_0, inclusive_namespaces = nil, with_comments = false)
  c14n_root = self
  document.canonicalize(mode, inclusive_namespaces, with_comments) do |node, parent|
    tn = node.is_a?(XML::Node) ? node : parent
    tn == c14n_root || tn.ancestors.include?(c14n_root)
  end
end

#cdata? ⇒ Boolean

Returns true if this is a CDATA

Returns:

  • (Boolean) 


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# File 'lib/nokogiri/xml/node.rb', line 876

def cdata?
  type == CDATA_SECTION_NODE
end

#child ⇒ Object

Returns the child node



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# File 'ext/nokogiri/xml_node.c', line 787

static VALUE
child(VALUE self)
{
  xmlNodePtr node, child;
  Data_Get_Struct(self, xmlNode, node);

  child = node->children;
  if (!child) { return Qnil; }

  return noko_xml_node_wrap(Qnil, child);
}

#children ⇒ Object

Get the list of children for this node as a NodeSet



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# File 'ext/nokogiri/xml_node.c', line 712

static VALUE
children(VALUE self)
{
  xmlNodePtr node;
  xmlNodePtr child;
  xmlNodeSetPtr set;
  VALUE document;
  VALUE node_set;

  Data_Get_Struct(self, xmlNode, node);

  child = node->children;
  set = xmlXPathNodeSetCreate(child);

  document = DOC_RUBY_OBJECT(node->doc);

  if (!child) { return noko_xml_node_set_wrap(set, document); }

  child = child->next;
  while (NULL != child) {
    xmlXPathNodeSetAddUnique(set, child);
    child = child->next;
  }

  node_set = noko_xml_node_set_wrap(set, document);

  return node_set;
}

#children=(node_or_tags) ⇒ Object

Set the inner html for this Node node_or_tags node_or_tags can be a Nokogiri::XML::Node, a Nokogiri::XML::DocumentFragment, or a string containing markup.

Returns the reparented node (if node_or_tags is a Node), or NodeSet (if node_or_tags is a DocumentFragment, NodeSet, or string).

Also see related method inner_html=



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# File 'lib/nokogiri/xml/node.rb', line 247

def children=(node_or_tags)
  node_or_tags = coerce(node_or_tags)
  children.unlink
  if node_or_tags.is_a?(XML::NodeSet)
    node_or_tags.each { |n| add_child_node_and_reparent_attrs n }
  else
    add_child_node_and_reparent_attrs node_or_tags
  end
  node_or_tags
end

#classes ⇒ Array<String>

Get the CSS class names of a Node.

This is a convenience function and is equivalent to:

node.kwattr_values("class")

Examples:

node         # => <div class="section title header"></div>
node.classes # => ["section", "title", "header"]

Returns:

  • (Array<String>) —

    The CSS classes present in the Node’s class attribute. If the attribute is empty or non-existent, the return value is an empty array.

See Also:



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# File 'lib/nokogiri/xml/node.rb', line 456

def classes
  kwattr_values("class")
end

#comment? ⇒ Boolean

Returns true if this is a Comment

Returns:

  • (Boolean) 


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# File 'lib/nokogiri/xml/node.rb', line 871

def comment?
  type == COMMENT_NODE
end

#content ⇒ Object Also known as: text, inner_text

Returns the plaintext content for this Node. Note that entities will always be expanded in the returned string.



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# File 'ext/nokogiri/xml_node.c', line 1166

static VALUE
get_native_content(VALUE self)
{
  xmlNodePtr node;
  xmlChar *content;

  Data_Get_Struct(self, xmlNode, node);

  content = xmlNodeGetContent(node);
  if (content) {
    VALUE rval = NOKOGIRI_STR_NEW2(content);
    xmlFree(content);
    return rval;
  }
  return Qnil;
}

#content=(string) ⇒ Object

Set the Node’s content to a Text node containing string. The string gets XML escaped, not interpreted as markup.



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

def content=(string)
  self.native_content = encode_special_chars(string.to_s)
end

#create_external_subset(name, external_id, system_id) ⇒ Object

Create an external subset



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# File 'ext/nokogiri/xml_node.c', line 463

static VALUE
create_external_subset(VALUE self, VALUE name, VALUE external_id, VALUE system_id)
{
  xmlNodePtr node;
  xmlDocPtr doc;
  xmlDtdPtr dtd;

  Data_Get_Struct(self, xmlNode, node);

  doc = node->doc;

  if (doc->extSubset) {
    rb_raise(rb_eRuntimeError, "Document already has an external subset");
  }

  dtd = xmlNewDtd(
          doc,
          NIL_P(name)        ? NULL : (const xmlChar *)StringValueCStr(name),
          NIL_P(external_id) ? NULL : (const xmlChar *)StringValueCStr(external_id),
          NIL_P(system_id)   ? NULL : (const xmlChar *)StringValueCStr(system_id)
        );

  if (!dtd) { return Qnil; }

  return noko_xml_node_wrap(Qnil, (xmlNodePtr)dtd);
}

#create_internal_subset(name, external_id, system_id) ⇒ Object

Create the internal subset of a document.

doc.create_internal_subset("chapter", "-//OASIS//DTD DocBook XML//EN", "chapter.dtd")
# => <!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML//EN" "chapter.dtd">

doc.create_internal_subset("chapter", nil, "chapter.dtd")
# => <!DOCTYPE chapter SYSTEM "chapter.dtd">



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# File 'ext/nokogiri/xml_node.c', line 430

static VALUE
create_internal_subset(VALUE self, VALUE name, VALUE external_id, VALUE system_id)
{
  xmlNodePtr node;
  xmlDocPtr doc;
  xmlDtdPtr dtd;

  Data_Get_Struct(self, xmlNode, node);

  doc = node->doc;

  if (xmlGetIntSubset(doc)) {
    rb_raise(rb_eRuntimeError, "Document already has an internal subset");
  }

  dtd = xmlCreateIntSubset(
          doc,
          NIL_P(name)        ? NULL : (const xmlChar *)StringValueCStr(name),
          NIL_P(external_id) ? NULL : (const xmlChar *)StringValueCStr(external_id),
          NIL_P(system_id)   ? NULL : (const xmlChar *)StringValueCStr(system_id)
        );

  if (!dtd) { return Qnil; }

  return noko_xml_node_wrap(Qnil, (xmlNodePtr)dtd);
}

#css_path ⇒ Object

Get the path to this node as a CSS expression



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# File 'lib/nokogiri/xml/node.rb', line 945

def css_path
  path.split(/\//).map { |part|
    part.length == 0 ? nil : part.gsub(/\[(\d+)\]/, ':nth-of-type(\1)')
  }.compact.join(" > ")
end

#decorate! ⇒ Object

Decorate this node with the decorators set up in this node’s Document



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# File 'lib/nokogiri/xml/node.rb', line 104

def decorate!
  document.decorate(self)
end

#default_namespace=(url) ⇒ Object

Adds a default namespace supplied as a string url href, to self. The consequence is as an xmlns attribute with supplied argument were present in parsed XML. A default namespace set with this method will now show up in #attributes, but when this node is serialized to XML an “xmlns” attribute will appear. See also #namespace and #namespace=



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# File 'lib/nokogiri/xml/node.rb', line 321

def default_namespace=(url)
  add_namespace_definition(nil, url)
end

#description ⇒ Object

Fetch the Nokogiri::HTML4::ElementDescription for this node. Returns nil on XML documents and on unknown tags.



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# File 'lib/nokogiri/xml/node.rb', line 913

def description
  return nil if document.xml?
  Nokogiri::HTML4::ElementDescription[name]
end

#do_xinclude(options = XML::ParseOptions::DEFAULT_XML) {|options| ... } ⇒ Object

Do xinclude substitution on the subtree below node. If given a block, a Nokogiri::XML::ParseOptions object initialized from options, will be passed to it, allowing more convenient modification of the parser options.

Yields:

  • (options) 


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# File 'lib/nokogiri/xml/node.rb', line 348

def do_xinclude(options = XML::ParseOptions::DEFAULT_XML)
  options = Nokogiri::XML::ParseOptions.new(options) if Integer === options

  # give options to user
  yield options if block_given?

  # call c extension
  process_xincludes(options.to_i)
end

#document ⇒ Object

Get the document for this Node



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# File 'ext/nokogiri/xml_node.c', line 370

static VALUE
document(VALUE self)
{
  xmlNodePtr node;
  Data_Get_Struct(self, xmlNode, node);
  return DOC_RUBY_OBJECT(node->doc);
}

#document? ⇒ Boolean

Returns true if this is a Document

Returns:

  • (Boolean) 


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# File 'lib/nokogiri/xml/node.rb', line 891

def document?
  is_a? XML::Document
end

#dup ⇒ Object #dup(depth) ⇒ Object #dup(depth, new_parent_doc) ⇒ Object Also known as: clone

Copy this node. An optional depth may be passed in. 0 is a shallow copy, 1 (the default) is a deep copy. An optional new_parent_doc may also be passed in, which will be the new node’s parent document. Defaults to the current node’s document. current document.



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# File 'ext/nokogiri/xml_node.c', line 552

static VALUE
duplicate_node(int argc, VALUE *argv, VALUE self)
{
  VALUE r_level, r_new_parent_doc;
  int level;
  int n_args;
  xmlDocPtr new_parent_doc;
  xmlNodePtr node, dup;

  Data_Get_Struct(self, xmlNode, node);

  n_args = rb_scan_args(argc, argv, "02", &r_level, &r_new_parent_doc);

  if (n_args < 1) {
    r_level = INT2NUM((long)1);
  }
  level = (int)NUM2INT(r_level);

  if (n_args < 2) {
    new_parent_doc = node->doc;
  } else {
    Data_Get_Struct(r_new_parent_doc, xmlDoc, new_parent_doc);
  }

  dup = xmlDocCopyNode(node, new_parent_doc, level);
  if (dup == NULL) { return Qnil; }

  noko_xml_document_pin_node(dup);

  return noko_xml_node_wrap(rb_obj_class(self), dup);
}

#each ⇒ Object

Iterate over each attribute name and value pair for this Node.



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# File 'lib/nokogiri/xml/node.rb', line 422

def each
  attribute_nodes.each { |node|
    yield [node.node_name, node.value]
  }
end

#element? ⇒ Boolean Also known as: elem?

Returns true if this is an Element node

Returns:

  • (Boolean) 


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# File 'lib/nokogiri/xml/node.rb', line 926

def element?
  type == ELEMENT_NODE
end

#element_children ⇒ Object Also known as: elements

Get the list of children for this node as a NodeSet. All nodes will be element nodes.

Example:

@doc.root.element_children.all? { |x| x.element? } # => true



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# File 'ext/nokogiri/xml_node.c', line 752

static VALUE
element_children(VALUE self)
{
  xmlNodePtr node;
  xmlNodePtr child;
  xmlNodeSetPtr set;
  VALUE document;
  VALUE node_set;

  Data_Get_Struct(self, xmlNode, node);

  child = xmlFirstElementChild(node);
  set = xmlXPathNodeSetCreate(child);

  document = DOC_RUBY_OBJECT(node->doc);

  if (!child) { return noko_xml_node_set_wrap(set, document); }

  child = xmlNextElementSibling(child);
  while (NULL != child) {
    xmlXPathNodeSetAddUnique(set, child);
    child = xmlNextElementSibling(child);
  }

  node_set = noko_xml_node_set_wrap(set, document);

  return node_set;
}

#encode_special_chars(string) ⇒ Object

Encode any special characters in string



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# File 'ext/nokogiri/xml_node.c', line 399

static VALUE
encode_special_chars(VALUE self, VALUE string)
{
  xmlNodePtr node;
  xmlChar *encoded;
  VALUE encoded_str;

  Data_Get_Struct(self, xmlNode, node);
  encoded = xmlEncodeSpecialChars(
              node->doc,
              (const xmlChar *)StringValueCStr(string)
            );

  encoded_str = NOKOGIRI_STR_NEW2(encoded);
  xmlFree(encoded);

  return encoded_str;
}

#external_subset ⇒ Object

Get the external subset



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# File 'ext/nokogiri/xml_node.c', line 496

static VALUE
external_subset(VALUE self)
{
  xmlNodePtr node;
  xmlDocPtr doc;
  xmlDtdPtr dtd;

  Data_Get_Struct(self, xmlNode, node);

  if (!node->doc) { return Qnil; }

  doc = node->doc;
  dtd = doc->extSubset;

  if (!dtd) { return Qnil; }

  return noko_xml_node_wrap(Qnil, (xmlNodePtr)dtd);
}

#first_element_child ⇒ Object

Returns the first child node of this node that is an element.

Example:

@doc.root.first_element_child.element? # => true



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# File 'ext/nokogiri/xml_node.c', line 809

static VALUE
first_element_child(VALUE self)
{
  xmlNodePtr node, child;
  Data_Get_Struct(self, xmlNode, node);

  child = xmlFirstElementChild(node);
  if (!child) { return Qnil; }

  return noko_xml_node_wrap(Qnil, child);
}

#fragment(tags) ⇒ Object

Create a DocumentFragment containing tags that is relative to this context node.



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# File 'lib/nokogiri/xml/node.rb', line 788

def fragment(tags)
  type = document.html? ? Nokogiri::HTML : Nokogiri::XML
  type::DocumentFragment.new(document, tags, self)
end

#fragment? ⇒ Boolean

Returns true if this is a DocumentFragment

Returns:

  • (Boolean) 


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# File 'lib/nokogiri/xml/node.rb', line 906

def fragment?
  type == DOCUMENT_FRAG_NODE
end

#html? ⇒ Boolean

Returns true if this is an HTML4::Document node

Returns:

  • (Boolean) 


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# File 'lib/nokogiri/xml/node.rb', line 886

def html?
  type == HTML_DOCUMENT_NODE
end

#inner_html(*args) ⇒ Object

Get the inner_html for this node’s Node#children



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# File 'lib/nokogiri/xml/node.rb', line 940

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

#inner_html=(node_or_tags) ⇒ Object

Set the inner html for this Node to node_or_tags node_or_tags can be a Nokogiri::XML::Node, a Nokogiri::XML::DocumentFragment, or a string containing markup.

Returns self.

Also see related method children=



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

def inner_html=(node_or_tags)
  self.children = node_or_tags
  self
end

#internal_subset ⇒ Object

Get the internal subset



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# File 'ext/nokogiri/xml_node.c', line 521

static VALUE
internal_subset(VALUE self)
{
  xmlNodePtr node;
  xmlDocPtr doc;
  xmlDtdPtr dtd;

  Data_Get_Struct(self, xmlNode, node);

  if (!node->doc) { return Qnil; }

  doc = node->doc;
  dtd = xmlGetIntSubset(doc);

  if (!dtd) { return Qnil; }

  return noko_xml_node_wrap(Qnil, (xmlNodePtr)dtd);
}

#key?(attribute) ⇒ Boolean Also known as: has_attribute?

Returns true if attribute is set

Returns:

  • (Boolean) 


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# File 'ext/nokogiri/xml_node.c', line 849

static VALUE
key_eh(VALUE self, VALUE attribute)
{
  xmlNodePtr node;
  Data_Get_Struct(self, xmlNode, node);
  if (xmlHasProp(node, (xmlChar *)StringValueCStr(attribute))) {
    return Qtrue;
  }
  return Qfalse;
}

#keys ⇒ Object

Get the attribute names for this Node.



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# File 'lib/nokogiri/xml/node.rb', line 416

def keys
  attribute_nodes.map(&:node_name)
end

#kwattr_add(attribute_name, keywords) ⇒ Node

Ensure that values are present in a keyword attribute.

Any values in keywords that already exist in the Node‘s attribute values are not added. Note that any existing duplicates in the attribute values are not removed. Compare with #kwattr_append.

A “keyword attribute” is a node attribute that contains a set of space-delimited values. Perhaps the most familiar example of this is the HTML class attribute used to contain CSS classes. But other keyword attributes exist, for instance [‘rel`](developer.mozilla.org/en-US/docs/Web/HTML/Attributes/rel).

Examples:

Ensure that a Node has “nofollow” in its rel attribute.

node                               # => <a></a>
node.kwattr_add("rel", "nofollow") # => <a rel="nofollow"></a>
node.kwattr_add("rel", "nofollow") # => <a rel="nofollow"></a> # duplicate not added

Ensure that a Node has “nofollow” and “noreferrer” in its rel attribute, via a String argument.

node                                          # => <a rel="nofollow nofollow"></a>
node.kwattr_add("rel", "nofollow noreferrer") # => <a rel="nofollow nofollow noreferrer"></a>
# Note that "nofollow" is not added because it is already present.
# Note also that the pre-existing duplicate "nofollow" is not removed.

Ensure that a Node has “nofollow” and “noreferrer” in its rel attribute, via an Array argument.

node                                               # => <a></a>
node.kwattr_add("rel", ["nofollow", "noreferrer"]) # => <a rel="nofollow noreferrer"></a>

Parameters:

  • attribute_name (String) —

    The name of the keyword attribute to be modified.

  • keywords (String, Array<String>) —

    Keywords to be added to the attribute named attribute_name. May be a string containing whitespace-delimited values, or an Array of String values. Any values already present will not be added. Any values not present will be added. If the named attribute does not exist, it is created.

Returns:

  • (Node) —

    Returns self for ease of chaining method calls.

See Also:

Since:

  • v1.11.0



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# File 'lib/nokogiri/xml/node.rb', line 656

def kwattr_add(attribute_name, keywords)
  keywords = keywordify(keywords)
  current_kws = kwattr_values(attribute_name)
  new_kws = (current_kws + (keywords - current_kws)).join(" ")
  set_attribute(attribute_name, new_kws)
  self
end

#kwattr_append(attribute_name, keywords) ⇒ Node

Add keywords to a Node’s keyword attribute, regardless of duplication. Compare with #kwattr_add.

A “keyword attribute” is a node attribute that contains a set of space-delimited values. Perhaps the most familiar example of this is the HTML class attribute used to contain CSS classes. But other keyword attributes exist, for instance [‘rel`](developer.mozilla.org/en-US/docs/Web/HTML/Attributes/rel).

Examples:

Append “nofollow” to the rel attribute.

node                                  # => <a></a>
node.kwattr_append("rel", "nofollow") # => <a rel="nofollow"></a>
node.kwattr_append("rel", "nofollow") # => <a rel="nofollow nofollow"></a> # duplicate added!

Append “nofollow” and “noreferrer” to the rel attribute, via a String argument.

node                                             # => <a rel="nofollow"></a>
node.kwattr_append("rel", "nofollow noreferrer") # => <a rel="nofollow nofollow noreferrer"></a>
# Note that "nofollow" is appended even though it is already present.

Append “nofollow” and “noreferrer” to the rel attribute, via an Array argument.

node                                                  # => <a></a>
node.kwattr_append("rel", ["nofollow", "noreferrer"]) # => <a rel="nofollow noreferrer"></a>

Parameters:

  • attribute_name (String) —

    The name of the keyword attribute to be modified.

  • keywords (String, Array<String>) —

    Keywords to be added to the attribute named attribute_name. May be a string containing whitespace-delimited values, or an Array of String values. All values passed in will be appended to the named attribute even if they are already present in the attribute. If the named attribute does not exist, it is created.

Returns:

  • (Node) —

    Returns self for ease of chaining method calls.

See Also:

Since:

  • v1.11.0



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# File 'lib/nokogiri/xml/node.rb', line 708

def kwattr_append(attribute_name, keywords)
  keywords = keywordify(keywords)
  current_kws = kwattr_values(attribute_name)
  new_kws = (current_kws + keywords).join(" ")
  set_attribute(attribute_name, new_kws)
  self
end

#kwattr_remove(attribute_name, keywords) ⇒ Node

Remove keywords from a keyword attribute. Any matching keywords that exist in the named attribute are removed, including any multiple entries.

If no keywords remain after this operation, or if keywords is nil, the attribute is deleted from the node.

A “keyword attribute” is a node attribute that contains a set of space-delimited values. Perhaps the most familiar example of this is the HTML class attribute used to contain CSS classes. But other keyword attributes exist, for instance [‘rel`](developer.mozilla.org/en-US/docs/Web/HTML/Attributes/rel).

Examples:

node                                    # => <a rel="nofollow noreferrer">link</a>
node.kwattr_remove("rel", "nofollow")   # => <a rel="noreferrer">link</a>
node.kwattr_remove("rel", "noreferrer") # => <a>link</a> # attribute is deleted when empty

Parameters:

  • attribute_name (String) —

    The name of the keyword attribute to be modified.

  • keywords (String, Array<String>) —

    Keywords to be removed from the attribute named attribute_name. May be a string containing whitespace-delimited values, or an Array of String values. Any keywords present in the named attribute will be removed. If no keywords remain, or if keywords is nil, the attribute is deleted.

Returns:

  • (Node) —

    Returns self for ease of chaining method calls.

See Also:

Since:

  • v1.11.0



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# File 'lib/nokogiri/xml/node.rb', line 754

def kwattr_remove(attribute_name, keywords)
  if keywords.nil?
    remove_attribute(attribute_name)
    return self
  end

  keywords = keywordify(keywords)
  current_kws = kwattr_values(attribute_name)
  new_kws = current_kws - keywords
  if new_kws.empty?
    remove_attribute(attribute_name)
  else
    set_attribute(attribute_name, new_kws.join(" "))
  end
  self
end

#kwattr_values(attribute_name) ⇒ Array<String>

Retrieve values from a keyword attribute of a Node.

A “keyword attribute” is a node attribute that contains a set of space-delimited values. Perhaps the most familiar example of this is the HTML class attribute used to contain CSS classes. But other keyword attributes exist, for instance [‘rel`](developer.mozilla.org/en-US/docs/Web/HTML/Attributes/rel).

Examples:

node                      # => <a rel="nofollow noopener external">link</a>
node.kwattr_values("rel") # => ["nofollow", "noopener", "external"]

Parameters:

  • attribute_name (String) —

    The name of the keyword attribute to be inspected.

Returns:

  • (Array<String>) —

    The values present in the Node’s attribute_name attribute. If the attribute is empty or non-existent, the return value is an empty array.

See Also:

Since:

  • v1.11.0



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# File 'lib/nokogiri/xml/node.rb', line 604

def kwattr_values(attribute_name)
  keywordify(get_attribute(attribute_name) || [])
end

#lang ⇒ Object

Searches the language of a node, i.e. the values of the xml:lang attribute or the one carried by the nearest ancestor.



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# File 'ext/nokogiri/xml_node.c', line 1210

static VALUE
get_lang(VALUE self_rb)
{
  xmlNodePtr self ;
  xmlChar *lang ;
  VALUE lang_rb ;

  Data_Get_Struct(self_rb, xmlNode, self);

  lang = xmlNodeGetLang(self);
  if (lang) {
    lang_rb = NOKOGIRI_STR_NEW2(lang);
    xmlFree(lang);
    return lang_rb ;
  }

  return Qnil ;
}

#lang= ⇒ Object

Set the language of a node, i.e. the values of the xml:lang attribute.



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# File 'ext/nokogiri/xml_node.c', line 1189

static VALUE
set_lang(VALUE self_rb, VALUE lang_rb)
{
  xmlNodePtr self ;
  xmlChar *lang ;

  Data_Get_Struct(self_rb, xmlNode, self);
  lang = (xmlChar *)StringValueCStr(lang_rb);

  xmlNodeSetLang(self, lang);

  return Qnil ;
}

#last_element_child ⇒ Object

Returns the last child node of this node that is an element.

Example:

@doc.root.last_element_child.element? # => true



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# File 'ext/nokogiri/xml_node.c', line 831

static VALUE
last_element_child(VALUE self)
{
  xmlNodePtr node, child;
  Data_Get_Struct(self, xmlNode, node);

  child = xmlLastElementChild(node);
  if (!child) { return Qnil; }

  return noko_xml_node_wrap(Qnil, child);
}

#line ⇒ Object

Returns the line for this Node



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# File 'ext/nokogiri/xml_node.c', line 1377

static VALUE
line(VALUE self)
{
  xmlNodePtr node;
  Data_Get_Struct(self, xmlNode, node);

  return INT2NUM(xmlGetLineNo(node));
}

#line=(num) ⇒ Object

Sets the line for this Node. num must be less than 65535.



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# File 'ext/nokogiri/xml_node.c', line 1392

static VALUE
set_line(VALUE self, VALUE num)
{
  xmlNodePtr node;
  int value = NUM2INT(num);

  Data_Get_Struct(self, xmlNode, node);
  if (value < 65535) {
    node->line = value;
  }

  return num;
}

#matches?(selector) ⇒ Boolean

Returns true if this Node matches selector

Returns:

  • (Boolean) 


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# File 'lib/nokogiri/xml/node.rb', line 781

def matches?(selector)
  ancestors.last.search(selector).include?(self)
end

#namespace ⇒ Object

returns the namespace of the element or attribute node as a Namespace object, or nil if there is no namespace for the element or attribute.



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# File 'ext/nokogiri/xml_node.c', line 1047

static VALUE
noko_xml_node_namespace(VALUE rb_node)
{
  xmlNodePtr c_node ;
  Data_Get_Struct(rb_node, xmlNode, c_node);

  if (c_node->ns) {
    return noko_xml_namespace_wrap(c_node->ns, c_node->doc);
  }

  return Qnil ;
}

#namespace=(ns) ⇒ Object

Set the default namespace on this node (as would be defined with an “xmlns=” attribute in XML source), as a Namespace object ns. Note that a Namespace added this way will NOT be serialized as an xmlns attribute for this node. You probably want #default_namespace= instead, or perhaps #add_namespace_definition with a nil prefix argument.



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# File 'lib/nokogiri/xml/node.rb', line 331

def namespace=(ns)
  return set_namespace(ns) unless ns

  unless Nokogiri::XML::Namespace === ns
    raise TypeError, "#{ns.class} can't be coerced into Nokogiri::XML::Namespace"
  end
  if ns.document != document
    raise ArgumentError, "namespace must be declared on the same document"
  end

  set_namespace ns
end

#namespace_definitions ⇒ Object

returns namespaces defined on self element directly, as an array of Namespace objects. Includes both a default namespace (as in“xmlns=”), and prefixed namespaces (as in “xmlns:prefix=”).



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# File 'ext/nokogiri/xml_node.c', line 1066

static VALUE
namespace_definitions(VALUE rb_node)
{
  /* this code in the mode of xmlHasProp() */
  xmlNodePtr c_node ;
  xmlNsPtr c_namespace;
  VALUE definitions = rb_ary_new();

  Data_Get_Struct(rb_node, xmlNode, c_node);

  c_namespace = c_node->nsDef;
  if (!c_namespace) {
    return definitions;
  }

  while (c_namespace != NULL) {
    rb_ary_push(definitions, noko_xml_namespace_wrap(c_namespace, c_node->doc));
    c_namespace = c_namespace->next;
  }

  return definitions;
}

#namespace_scopes ⇒ Object

returns namespaces in scope for self – those defined on self element directly or any ancestor node – as an array of Namespace objects. Default namespaces (“xmlns=” style) for self are included in this array; Default namespaces for ancestors, however, are not. See also #namespaces



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# File 'ext/nokogiri/xml_node.c', line 1098

static VALUE
namespace_scopes(VALUE rb_node)
{
  xmlNodePtr c_node ;
  xmlNsPtr *namespaces;
  VALUE scopes = rb_ary_new();
  int j;

  Data_Get_Struct(rb_node, xmlNode, c_node);

  namespaces = xmlGetNsList(c_node->doc, c_node);
  if (!namespaces) {
    return scopes;
  }

  for (j = 0 ; namespaces[j] != NULL ; ++j) {
    rb_ary_push(scopes, noko_xml_namespace_wrap(namespaces[j], c_node->doc));
  }

  xmlFree(namespaces);
  return scopes;
}

#namespaced_key?(attribute, namespace) ⇒ Boolean

Returns true if attribute is set with namespace

Returns:

  • (Boolean) 


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# File 'ext/nokogiri/xml_node.c', line 866

static VALUE
namespaced_key_eh(VALUE self, VALUE attribute, VALUE namespace)
{
  xmlNodePtr node;
  Data_Get_Struct(self, xmlNode, node);
  if (xmlHasNsProp(node, (xmlChar *)StringValueCStr(attribute),
                   NIL_P(namespace) ? NULL : (xmlChar *)StringValueCStr(namespace))) {
    return Qtrue;
  }
  return Qfalse;
}

#namespaces ⇒ Object

Returns a Hash of {prefix => value} for all namespaces on this node and its ancestors.

This method returns the same namespaces as #namespace_scopes.

Returns namespaces in scope for self – those defined on self element directly or any ancestor node – as a Hash of attribute-name/value pairs. Note that the keys in this hash XML attributes that would be used to define this namespace, such as “xmlns:prefix”, not just the prefix. Default namespace set on self will be included with key “xmlns”. However, default namespaces set on ancestor will NOT be, even if self has no explicit default namespace.



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# File 'lib/nokogiri/xml/node.rb', line 862

def namespaces
  namespace_scopes.each_with_object({}) do |ns, hash|
    prefix = ns.prefix
    key = prefix ? "xmlns:#{prefix}" : "xmlns"
    hash[key] = ns.href
  end
end

#content= ⇒ Object

Set the content for this Node



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# File 'ext/nokogiri/xml_node.c', line 1141

static VALUE
set_native_content(VALUE self, VALUE content)
{
  xmlNodePtr node, child, next ;
  Data_Get_Struct(self, xmlNode, node);

  child = node->children;
  while (NULL != child) {
    next = child->next ;
    xmlUnlinkNode(child) ;
    noko_xml_document_pin_node(child);
    child = next ;
  }

  xmlNodeSetContent(node, (xmlChar *)StringValueCStr(content));
  return content;
}

#next_element ⇒ Object

Returns the next Nokogiri::XML::Element type sibling node.



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# File 'ext/nokogiri/xml_node.c', line 656

static VALUE
next_element(VALUE self)
{
  xmlNodePtr node, sibling;
  Data_Get_Struct(self, xmlNode, node);

  sibling = xmlNextElementSibling(node);
  if (!sibling) { return Qnil; }

  return noko_xml_node_wrap(Qnil, sibling);
}

#next_sibling ⇒ Object Also known as: next

Returns the next sibling node



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# File 'ext/nokogiri/xml_node.c', line 620

static VALUE
next_sibling(VALUE self)
{
  xmlNodePtr node, sibling;
  Data_Get_Struct(self, xmlNode, node);

  sibling = node->next;
  if (!sibling) { return Qnil; }

  return noko_xml_node_wrap(Qnil, sibling) ;
}

#name ⇒ Object Also known as: name

Returns the name for this Node



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# File 'ext/nokogiri/xml_node.c', line 1275

static VALUE
get_name(VALUE self)
{
  xmlNodePtr node;
  Data_Get_Struct(self, xmlNode, node);
  if (node->name) {
    return NOKOGIRI_STR_NEW2(node->name);
  }
  return Qnil;
}

#name=(new_name) ⇒ Object Also known as: name=

Set the name for this Node



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# File 'ext/nokogiri/xml_node.c', line 1260

static VALUE
set_name(VALUE self, VALUE new_name)
{
  xmlNodePtr node;
  Data_Get_Struct(self, xmlNode, node);
  xmlNodeSetName(node, (xmlChar *)StringValueCStr(new_name));
  return new_name;
}

#node_type ⇒ Object Also known as: type

Get the type for this Node



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# File 'ext/nokogiri/xml_node.c', line 1127

static VALUE
node_type(VALUE self)
{
  xmlNodePtr node;
  Data_Get_Struct(self, xmlNode, node);
  return INT2NUM((long)node->type);
}

#parent ⇒ Object

Get the parent Node for this Node



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# File 'ext/nokogiri/xml_node.c', line 1242

static VALUE
get_parent(VALUE self)
{
  xmlNodePtr node, parent;
  Data_Get_Struct(self, xmlNode, node);

  parent = node->parent;
  if (!parent) { return Qnil; }

  return noko_xml_node_wrap(Qnil, parent) ;
}

#parent=(parent_node) ⇒ Object

Set the parent Node for this Node



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# File 'lib/nokogiri/xml/node.rb', line 310

def parent=(parent_node)
  parent_node.add_child(self)
  parent_node
end

#parse(string_or_io, options = nil) {|options| ... } ⇒ Object

Parse string_or_io as a document fragment within the context of this node. Returns a XML::NodeSet containing the nodes parsed from string_or_io.

Yields:

  • (options) 


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# File 'lib/nokogiri/xml/node.rb', line 797

def parse(string_or_io, options = nil)
  ##
  # When the current node is unparented and not an element node, use the
  # document as the parsing context instead. Otherwise, the in-context
  # parser cannot find an element or a document node.
  # Document Fragments are also not usable by the in-context parser.
  if !element? && !document? && (!parent || parent.fragment?)
    return document.parse(string_or_io, options)
  end

  options ||= (document.html? ? ParseOptions::DEFAULT_HTML : ParseOptions::DEFAULT_XML)
  if Integer === options
    options = Nokogiri::XML::ParseOptions.new(options)
  end
  # Give the options to the user
  yield options if block_given?

  contents = string_or_io.respond_to?(:read) ?
    string_or_io.read :
    string_or_io

  return Nokogiri::XML::NodeSet.new(document) if contents.empty?

  # libxml2 does not obey the `recover` option after encountering errors during `in_context`
  # parsing, and so this horrible hack is here to try to emulate recovery behavior.
  #
  # Unfortunately, this means we're no longer parsing "in context" and so namespaces that
  # would have been inherited from the context node won't be handled correctly. This hack was
  # written in 2010, and I regret it, because it's silently degrading functionality in a way
  # that's not easily prevented (or even detected).
  #
  # I think preferable behavior would be to either:
  #
  # a. add an error noting that we "fell back" and pointing the user to turning off the `recover` option
  # b. don't recover, but raise a sensible exception
  #
  # For context and background: https://github.com/sparklemotion/nokogiri/issues/313
  # FIXME bug report: https://github.com/sparklemotion/nokogiri/issues/2092
  error_count = document.errors.length
  node_set = in_context(contents, options.to_i)
  if (node_set.empty? && (document.errors.length > error_count))
    if options.recover?
      fragment = Nokogiri::HTML4::DocumentFragment.parse contents
      node_set = fragment.children
    else
      raise document.errors[error_count]
    end
  end
  node_set
end

#path ⇒ Object

Returns the path associated with this Node



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# File 'ext/nokogiri/xml_node.c', line 1292

static VALUE
noko_xml_node_path(VALUE rb_node)
{
  xmlNodePtr c_node;
  xmlChar *c_path ;
  VALUE rval;

  Data_Get_Struct(rb_node, xmlNode, c_node);

  c_path = xmlGetNodePath(c_node);
  if (c_path == NULL) {
    // see https://github.com/sparklemotion/nokogiri/issues/2250
    // this behavior is clearly undesirable, but is what libxml <= 2.9.10 returned, and so we
    // do this for now to preserve the behavior across libxml2 versions.
    rval = NOKOGIRI_STR_NEW2("?");
  } else {
    rval = NOKOGIRI_STR_NEW2(c_path);
    xmlFree(c_path);
  }

  return rval ;
}

#pointer_id ⇒ Object

Get the internal pointer number



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# File 'ext/nokogiri/xml_node.c', line 384

static VALUE
pointer_id(VALUE self)
{
  xmlNodePtr node;
  Data_Get_Struct(self, xmlNode, node);

  return INT2NUM((long)(node));
}

#prepend_child(node_or_tags) ⇒ Object

Add node_or_tags as the first child of this Node. node_or_tags can be a Nokogiri::XML::Node, a ::DocumentFragment, a ::NodeSet, or a string containing markup.

Returns the reparented node (if node_or_tags is a Node), or NodeSet (if node_or_tags is a DocumentFragment, NodeSet, or string).

Also see related method add_child.



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# File 'lib/nokogiri/xml/node.rb', line 145

def prepend_child(node_or_tags)
  if first = children.first
    # Mimic the error add_child would raise.
    raise RuntimeError, "Document already has a root node" if document? && !(node_or_tags.comment? || node_or_tags.processing_instruction?)
    first.__send__(:add_sibling, :previous, node_or_tags)
  else
    add_child(node_or_tags)
  end
end

#previous_element ⇒ Object

Returns the previous Nokogiri::XML::Element type sibling node.



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# File 'ext/nokogiri/xml_node.c', line 674

static VALUE
previous_element(VALUE self)
{
  xmlNodePtr node, sibling;
  Data_Get_Struct(self, xmlNode, node);

  /*
   *  note that we don't use xmlPreviousElementSibling here because it's buggy pre-2.7.7.
   */
  sibling = node->prev;
  if (!sibling) { return Qnil; }

  while (sibling && sibling->type != XML_ELEMENT_NODE) {
    sibling = sibling->prev;
  }

  return sibling ? noko_xml_node_wrap(Qnil, sibling) : Qnil ;
}

#previous_sibling ⇒ Object Also known as: previous

Returns the previous sibling node



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# File 'ext/nokogiri/xml_node.c', line 638

static VALUE
previous_sibling(VALUE self)
{
  xmlNodePtr node, sibling;
  Data_Get_Struct(self, xmlNode, node);

  sibling = node->prev;
  if (!sibling) { return Qnil; }

  return noko_xml_node_wrap(Qnil, sibling);
}

#processing_instruction? ⇒ Boolean

Returns true if this is a ProcessingInstruction node

Returns:

  • (Boolean) 


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# File 'lib/nokogiri/xml/node.rb', line 896

def processing_instruction?
  type == PI_NODE
end

#read_only? ⇒ Boolean

Is this a read only node?

Returns:

  • (Boolean) 


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# File 'lib/nokogiri/xml/node.rb', line 920

def read_only?
  # According to gdome2, these are read-only node types
  [NOTATION_NODE, ENTITY_NODE, ENTITY_DECL].include?(type)
end

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

Remove the attribute named name



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# File 'lib/nokogiri/xml/node.rb', line 430

def remove_attribute(name)
  attr = attributes[name].remove if key? name
  clear_xpath_context if Nokogiri.jruby?
  attr
end

#remove_class(names = nil) ⇒ Node

Remove HTML CSS classes from a Node. Any CSS classes in names that exist in the Node‘s class attribute are removed, including any multiple entries.

If no CSS classes remain after this operation, or if names is nil, the class attribute is deleted from the node.

This is a convenience function and is equivalent to:

node.kwattr_remove("class", names)

Examples:

node                         # => <div class="section header"></div>
node.remove_class("section") # => <div class="header"></div>
node.remove_class("header")  # => <div></div> # attribute is deleted when empty

Parameters:

  • names (String, Array<String>) (defaults to: nil) —

    CSS class names to be removed from the Node’s class attribute. May be a string containing whitespace-delimited names, or an Array of String names. Any class names already present will be removed. If no CSS classes remain, the class attribute is deleted.

Returns:

  • (Node) —

    Returns self for ease of chaining method calls.

See Also:



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# File 'lib/nokogiri/xml/node.rb', line 573

def remove_class(names = nil)
  kwattr_remove("class", names)
end

#replace(node_or_tags) ⇒ Object

Replace this Node with node_or_tags. node_or_tags can be a Nokogiri::XML::Node, a ::DocumentFragment, a ::NodeSet, or a string containing markup.

Returns the reparented node (if node_or_tags is a Node), or NodeSet (if node_or_tags is a DocumentFragment, NodeSet, or string).

Also see related method swap.



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# File 'lib/nokogiri/xml/node.rb', line 265

def replace(node_or_tags)
  raise("Cannot replace a node with no parent") unless parent

  # We cannot replace a text node directly, otherwise libxml will return
  # an internal error at parser.c:13031, I don't know exactly why
  # libxml is trying to find a parent node that is an element or document
  # so I can't tell if this is bug in libxml or not. issue #775.
  if text?
    replacee = Nokogiri::XML::Node.new "dummy", document
    add_previous_sibling_node replacee
    unlink
    return replacee.replace node_or_tags
  end

  node_or_tags = parent.coerce(node_or_tags)

  if node_or_tags.is_a?(XML::NodeSet)
    node_or_tags.each { |n| add_previous_sibling n }
    unlink
  else
    replace_node node_or_tags
  end
  node_or_tags
end

#serialize(*args, &block) ⇒ Object

Serialize Node using options. Save options can also be set using a block. See SaveOptions.

These two statements are equivalent:

node.serialize(:encoding => 'UTF-8', :save_with => FORMAT | AS_XML)

or

node.serialize(:encoding => 'UTF-8') do |config|
  config.format.as_xml
end



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# File 'lib/nokogiri/xml/node.rb', line 1021

def serialize(*args, &block)
  options = args.first.is_a?(Hash) ? args.shift : {
    :encoding => args[0],
    :save_with => args[1],
  }

  encoding = options[:encoding] || document.encoding
  options[:encoding] = encoding

  outstring = String.new
  outstring.force_encoding(Encoding.find(encoding || "utf-8"))
  io = StringIO.new(outstring)
  write_to io, options, &block
  io.string
end

#swap(node_or_tags) ⇒ Object

Swap this Node for node_or_tags node_or_tags can be a Nokogiri::XML::Node, a ::DocumentFragment, a ::NodeSet, or a string containing markup.

Returns self, to support chaining of calls.

Also see related method replace.



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# File 'lib/nokogiri/xml/node.rb', line 297

def swap(node_or_tags)
  replace node_or_tags
  self
end

#text? ⇒ Boolean

Returns true if this is a Text node

Returns:

  • (Boolean) 


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# File 'lib/nokogiri/xml/node.rb', line 901

def text?
  type == TEXT_NODE
end

#to_html(options = {}) ⇒ Object

Serialize this Node to HTML

doc.to_html

See Node#write_to for a list of options. For formatted output, use Node#to_xhtml instead.



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# File 'lib/nokogiri/xml/node.rb', line 1044

def to_html(options = {})
  to_format SaveOptions::DEFAULT_HTML, options
end

#to_s ⇒ Object

Turn this node in to a string. If the document is HTML, this method returns html. If the document is XML, this method returns XML.



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# File 'lib/nokogiri/xml/node.rb', line 935

def to_s
  document.xml? ? to_xml : to_html
end

#to_xhtml(options = {}) ⇒ Object

Serialize this Node to XHTML using options

doc.to_xhtml(:indent => 5, :encoding => 'UTF-8')

See Node#write_to for a list of options



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# File 'lib/nokogiri/xml/node.rb', line 1065

def to_xhtml(options = {})
  to_format SaveOptions::DEFAULT_XHTML, options
end

#to_xml(options = {}) ⇒ Object

Serialize this Node to XML using options

doc.to_xml(:indent => 5, :encoding => 'UTF-8')

See Node#write_to for a list of options



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# File 'lib/nokogiri/xml/node.rb', line 1054

def to_xml(options = {})
  options[:save_with] ||= SaveOptions::DEFAULT_XML
  serialize(options)
end

#traverse(&block) ⇒ Object

Yields self and all children to block recursively.



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# File 'lib/nokogiri/xml/node.rb', line 977

def traverse(&block)
  children.each { |j| j.traverse(&block) }
  block.call(self)
end

#unlink ⇒ Object Also known as: remove

Unlink this node from its current context.



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# File 'ext/nokogiri/xml_node.c', line 590

static VALUE
unlink_node(VALUE self)
{
  xmlNodePtr node;
  Data_Get_Struct(self, xmlNode, node);
  xmlUnlinkNode(node);
  noko_xml_document_pin_node(node);
  return self;
}

#value?(value) ⇒ Boolean

Does this Node’s attributes include <value>

Returns:

  • (Boolean) 


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# File 'lib/nokogiri/xml/node.rb', line 410

def value?(value)
  values.include? value
end

#values ⇒ Object

Get the attribute values for this Node.



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# File 'lib/nokogiri/xml/node.rb', line 404

def values
  attribute_nodes.map(&:value)
end

#wrap(html) ⇒ Object

Add html around this node

Returns self



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# File 'lib/nokogiri/xml/node.rb', line 159

def wrap(html)
  new_parent = document.parse(html).first
  add_next_sibling(new_parent)
  new_parent.add_child(self)
  self
end

#write_html_to(io, options = {}) ⇒ Object

Write Node as HTML to io with options

See Node#write_to for a list of options



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# File 'lib/nokogiri/xml/node.rb', line 1113

def write_html_to(io, options = {})
  write_format_to SaveOptions::DEFAULT_HTML, io, options
end

#write_to(io, *options) {|config| ... } ⇒ Object

Write Node to io with options. options modify the output of this method. Valid options are:

  • :encoding for changing the encoding

  • :indent_text the indentation text, defaults to one space

  • :indent the number of :indent_text to use, defaults to 2

  • :save_with a combination of SaveOptions constants.

To save with UTF-8 indented twice:

node.write_to(io, :encoding => 'UTF-8', :indent => 2)

To save indented with two dashes:

node.write_to(io, :indent_text => '-', :indent => 2)

Yields:

  • (config) 


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# File 'lib/nokogiri/xml/node.rb', line 1086

def write_to(io, *options)
  options = options.first.is_a?(Hash) ? options.shift : {}
  encoding = options[:encoding] || options[0]
  if Nokogiri.jruby?
    save_options = options[:save_with] || options[1]
    indent_times = options[:indent] || 0
  else
    save_options = options[:save_with] || options[1] || SaveOptions::FORMAT
    indent_times = options[:indent] || 2
  end
  indent_text = options[:indent_text] || " "

  # Any string times 0 returns an empty string. Therefore, use the same
  # string instead of generating a new empty string for every node with
  # zero indentation.
  indentation = indent_times.zero? ? "" : (indent_text * indent_times)

  config = SaveOptions.new(save_options.to_i)
  yield config if block_given?

  native_write_to(io, encoding, indentation, config.options)
end

#write_xhtml_to(io, options = {}) ⇒ Object

Write Node as XHTML to io with options

See Node#write_to for a list of options



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# File 'lib/nokogiri/xml/node.rb', line 1121

def write_xhtml_to(io, options = {})
  write_format_to SaveOptions::DEFAULT_XHTML, io, options
end

#write_xml_to(io, options = {}) ⇒ Object

Write Node as XML to io with options

doc.write_xml_to io, :encoding => 'UTF-8'

See Node#write_to for a list of options



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# File 'lib/nokogiri/xml/node.rb', line 1131

def write_xml_to(io, options = {})
  options[:save_with] ||= SaveOptions::DEFAULT_XML
  write_to io, options
end

#xml? ⇒ Boolean

Returns true if this is an XML::Document node

Returns:

  • (Boolean) 


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# File 'lib/nokogiri/xml/node.rb', line 881

def xml?
  type == DOCUMENT_NODE
end