Class: Nokogiri::XML::Attr

Relationships & Source Files
Super Chains via Extension / Inclusion / Inheritance
Class Chain: self, `Node`
Instance Chain: self, `Node`, Enumerable, `::Nokogiri::ClassResolver`, `Searchable`, `PP::Node`
Inherits:	Nokogiri::XML::Node `::Object` Nokogiri::XML::Node Nokogiri::XML::Attr
Defined in:	ext/nokogiri/xml_attr.c, lib/nokogiri/xml/attr.rb

Overview

Attr represents a Attr node in an xml document.

Constant Summary

Class Method Summary

.new(document, name) constructor

Create a new Attr element on the document with name

`Node` - Inherited

.new	documented in lib/nokogiri/xml/node.rb.

Instance Attribute Summary

#value=(content) (also: #content=) writeonly

Set the value for this Attr to content.

`Node` - Inherited

#blank?	Returns `true` if the node is an empty or whitespace-only text or cdata node, else `false`.
#cdata?	Returns true if this is a `CDATA`.
#children	:category: Traversing Document Structure.
#children=	Set the content for this `Node` `node_or_tags`
#comment?	Returns true if this is a `Comment`.
#content	[Returns].
#content=	Set the content of this node to `input`.
#default_namespace=	Adds a default namespace supplied as a string `url` href, to self.
#document	:category: Traversing Document Structure.
#document?	Returns true if this is a `Document`.
#elem?	Alias for Node#element?.
#element?	Returns true if this is an `Element` node.
#fragment?	Returns true if this is a `DocumentFragment`.
#html?	Returns true if this is an `::Nokogiri::HTML4::Document` or `::Nokogiri::HTML5::Document` node.
#inner_html	Get the inner_html for this node’s Node#children
#inner_html=	Set the content for this `Node` to `node_or_tags`.
#inner_text	Alias for Node#content.
#lang	Searches the language of a node, i.e.
#lang=	Set the language of a node, i.e.
#line	Returns The line number of this `Node`.
#line=	Sets the line for this `Node`.
#name	Alias for Node#node_name.
#namespace	Returns The Namespace of the element or attribute node, or `nil` if there is no namespace.
#namespace=	Set the default namespace on this node (as would be defined with an “xmlns=” attribute in `::Nokogiri::XML` source), as a `Namespace` object `ns`.
#native_content=	Set the content of this node to `input`.
#next	Alias for Node#next_sibling.
#next=	Alias for Node#add_next_sibling.
#node_name	Returns the name for this `Node`.
#node_name=	Set the name for this `Node`.
#parent	Get the parent `Node` for this `Node`.
#parent=	Set the parent `Node` for this `Node`.
#previous	Alias for Node#previous_sibling.
#previous=	Alias for Node#add_previous_sibling.
#processing_instruction?	Returns true if this is a `ProcessingInstruction` node.
#read_only?	Is this a read only node?
#text	Alias for Node#content.
#text?	Returns true if this is a `Text` node.
#to_str	Alias for Node#content.
#xml?	Returns true if this is an `Document` node.
#prepend_newline?, #data_ptr?

Instance Method Summary

#deconstruct_keys(array_of_names) → Hash)

Returns a hash describing the Attr, to use in pattern matching.
#to_s

Alias for Node#content.
#value writeonly

Alias for Node#content.
#inspect_attributes private

`Node` - Inherited

#<<	Add `node_or_tags` as a child of this `Node`.
#<=>	Compare two `Node` objects with respect to their `Document`.
#==	`::Nokogiri::Test` to see if this `Node` is equal to `other`
#[]	Fetch an attribute from this node.
#[]=	Update the attribute `name` to #value, or create the attribute if it does not exist.
#accept	Accept a visitor.
#add_child	Add `node_or_tags` as a child of this `Node`.
#add_class	Ensure HTML `::Nokogiri::CSS` classes are present on `self`.
#add_namespace	Alias for Node#add_namespace_definition.
#add_namespace_definition	:category: Manipulating Document Structure.
#add_next_sibling	Insert `node_or_tags` after this `Node` (as a sibling).
#add_previous_sibling	Insert `node_or_tags` before this `Node` (as a sibling).
#after	Insert `node_or_tags` after this node (as a sibling).
#ancestors	Get a list of ancestor `Node` for this `Node`.
#append_class	Add HTML `::Nokogiri::CSS` classes to `self`, regardless of duplication.
#attr	Alias for Node#[].
#attribute	:category: Working With `Node` Attributes.
#attribute_nodes	:category: Working With `Node` Attributes.
#attribute_with_ns	:category: Working With `Node` Attributes.
#attributes	Fetch this node’s attributes.
#before	Insert `node_or_tags` before this node (as a sibling).
#canonicalize,
#child	:category: Traversing Document Structure.
#classes	Fetch CSS class names of a `Node`.
#clone	Clone this node.
#create_external_subset	Create an external subset.
#create_internal_subset	Create the internal subset of a document.
#css_path	Get the path to this node as a `::Nokogiri::CSS` expression.
#deconstruct_keys	Returns a hash describing the `Node`, to use in pattern matching.
#decorate!	Decorate this node with the decorators set up in this node’s `Document`.
#delete	Alias for Node#remove_attribute.
#description	Fetch the `::Nokogiri::HTML4::ElementDescription` for this node.
#do_xinclude	Do xinclude substitution on the subtree below node.
#dup	Duplicate this node.
#each	Iterate over each attribute name and value pair for this `Node`.
#element_children	[Returns].
#elements	Alias for Node#element_children.
#encode_special_chars	Encode any special characters in `string`
#external_subset	Get the external subset.
#first_element_child	Returns The first child `Node` that is an element.
#fragment	Create a `DocumentFragment` containing `tags` that is relative to this context node.
#get_attribute	Alias for Node#[].
#has_attribute?	Alias for Node#key?.
#initialize	Create a new node with `name` that belongs to `document`.
#internal_subset	Get the internal subset.
#key?	Returns true if `attribute` is set.
#keys	Get the attribute names for this `Node`.
#kwattr_add	Ensure that values are present in a keyword attribute.
#kwattr_append	Add keywords to a Node’s keyword attribute, regardless of duplication.
#kwattr_remove	Remove keywords from a keyword attribute.
#kwattr_values	Fetch values from a keyword attribute of a `Node`.
#last_element_child	Returns The last child `Node` that is an element.
#matches?	Returns true if this `Node` matches `selector`
#namespace_definitions	[Returns].
#namespace_scopes	Returns Array of all the Namespaces on this node and its ancestors.
#namespaced_key?	Returns true if `attribute` is set with `namespace`
#namespaces	Fetch all the namespaces on this node and its ancestors.
#next_element	Returns the next `Element` type sibling node.
#next_sibling	Returns the next sibling node.
#node_type	Get the type for this `Node`.
#parse	Parse `string_or_io` as a document fragment within the context of this node.
#path	Returns the path associated with this `Node`.
#pointer_id	[Returns].
#prepend_child	Add `node_or_tags` as the first child of this `Node`.
#previous_element	Returns the previous `Element` type sibling node.
#previous_sibling	Returns the previous sibling node.
#remove	Alias for Node#unlink.
#remove_attribute	Remove the attribute named `name`
#remove_class	Remove HTML `::Nokogiri::CSS` classes from this node.
#replace	Replace this `Node` with `node_or_tags`.
#serialize	Serialize Node using `options`.
#set_attribute	Alias for Node#[]=.
#swap	Swap this `Node` for `node_or_tags`
#to_html	Serialize this `Node` to `::Nokogiri::HTML`.
#to_s	Turn this node in to a string.
#to_xhtml	Serialize this `Node` to XHTML using `options`
#to_xml	Serialize this `Node` to `::Nokogiri::XML` using `options`
#traverse	Yields self and all children to `block` recursively.
#type	Alias for Node#node_type.
#unlink	Unlink this node from its current context.
#value?	Does this Node’s attributes include <value>.
#values	Get the attribute values for this `Node`.
#wrap	Wrap this `Node` with the node parsed from `markup` or a dup of the `node`.
#write_html_to	Write Node as `::Nokogiri::HTML` to `io` with `options`
#write_to	Serialize this node or document to `io`.
#write_xhtml_to	Write Node as XHTML to `io` with `options`
#write_xml_to	Write Node as `::Nokogiri::XML` to `io` with `options`
#add_child_node_and_reparent_attrs, #add_sibling,
#compare	Compare this `Node` to `other` with respect to their `Document`.
#dump_html	Returns the `Node` as html.
#get	Get the value for `attribute`
#html_standard_serialize,
#in_context	TODO: DOCUMENT ME.
#inspect_attributes, #keywordify,
#native_write_to	Write this `Node` to `io` with `encoding` and `options`
#process_xincludes	Loads and substitutes all xinclude elements below the node.
#set	Set the `property` to #value
#set_namespace	Set the namespace to `namespace`
#to_format, #write_format_to, #add_child_node, #add_next_sibling_node, #add_previous_sibling_node, #replace_node

`::Nokogiri::ClassResolver` - Included

#related_class

Find a class constant within the.

`Searchable` - Included

#%	Alias for Searchable#at.
#/	Alias for Searchable#search.
#>	Search this node’s immediate children using `::Nokogiri::CSS` selector `selector`
#at	Search this object for `paths`, and return only the first result.
#at_css	Search this object for `::Nokogiri::CSS` `rules`, and return only the first match.
#at_xpath	Search this node for `XPath` `paths`, and return only the first match.
#css	Search this object for `::Nokogiri::CSS` `rules`.
#search	Search this object for `paths`.
#xpath	Search this node for `XPath` `paths`.
#css_internal, #css_rules_to_xpath, #xpath_impl, #xpath_internal, #xpath_query_from_css_rule, #extract_params

`PP::Node` - Included

#inspect, #pretty_print

Constructor Details

.new(document, name)

Create a new Attr element on the document with name

[ GitHub ]

# File 'ext/nokogiri/xml_attr.c', line 55


static VALUE
new (int argc, VALUE *argv, VALUE klass)
{
  xmlDocPtr xml_doc;
  VALUE document;
  VALUE name;
  VALUE rest;
  xmlAttrPtr node;
  VALUE rb_node;

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

  if (! rb_obj_is_kind_of(document, cNokogiriXmlDocument)) {
    rb_raise(rb_eArgError, "parameter must be a Nokogiri::XML::Document");
  }

  xml_doc = noko_xml_document_unwrap(document);

  node = xmlNewDocProp(
           xml_doc,
           (const xmlChar *)StringValueCStr(name),
           NULL
         );

  noko_xml_document_pin_node((xmlNodePtr)node);

  rb_node = noko_xml_node_wrap(klass, (xmlNodePtr)node);
  rb_obj_call_init(rb_node, argc, argv);

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

  return rb_node;
}

Instance Attribute Details

#value=(content) (writeonly) Also known as: #content=

Set the value for this Attr to content. Use nil to remove the value (e.g., a ::Nokogiri::HTML boolean attribute).

[ GitHub ]

# File 'ext/nokogiri/xml_attr.c', line 12


static VALUE
set_value(VALUE self, VALUE content)
{
  xmlAttrPtr attr;
  xmlChar *value;
  xmlNode *cur;

  Noko_Node_Get_Struct(self, xmlAttr, attr);

  if (attr->children) {
    xmlFreeNodeList(attr->children);
  }
  attr->children = attr->last = NULL;

  if (content == Qnil) {
    return content;
  }

  value = xmlEncodeEntitiesReentrant(attr->doc, (unsigned char *)StringValueCStr(content));
  if (xmlStrlen(value) == 0) {
    attr->children = xmlNewDocText(attr->doc, value);
  } else {
    attr->children = xmlStringGetNodeList(attr->doc, value);
  }
  xmlFree(value);

  for (cur = attr->children; cur; cur = cur->next) {
    cur->parent = (xmlNode *)attr;
    cur->doc = attr->doc;
    if (cur->next == NULL) {
      attr->last = cur;
    }
  }

  return content;
}

Instance Method Details

#deconstruct_keys(array_of_names) → Hash)

Returns a hash describing the Attr, to use in pattern matching.

Valid keys and their values:

name → (String) The name of the attribute.
#value → (String) The value of the attribute.
namespace → (Namespace, nil) The Namespace of the attribute, or nil if there is no namespace.

Example

doc = Nokogiri::XML.parse(<<~XML)
  <?xml version="1.0"?>
  <root xmlns="http://nokogiri.org/ns/default" xmlns:noko="http://nokogiri.org/ns/noko">
    <child1 foo="abc" noko:bar="def"/>
  </root>
XML

attributes = doc.root.elements.first.attribute_nodes
# => [#(Attr:0x35c { name = "foo", value = "abc" }),
#     #(Attr:0x370 {
#       name = "bar",
#       namespace = #(Namespace:0x384 {
#         prefix = "noko",
#         href = "http://nokogiri.org/ns/noko"
#         }),
#       value = "def"
#       })]

attributes.first.deconstruct_keys([:name, :value, :namespace])
# => {:name=>"foo", :value=>"abc", :namespace=>nil}

attributes.last.deconstruct_keys([:name, :value, :namespace])
# => {:name=>"bar",
#     :value=>"def",
#     :namespace=>
#      #(Namespace:0x384 {
#        prefix = "noko",
#        href = "http://nokogiri.org/ns/noko"
#        })}

Since v1.14.0

[ GitHub ]

# File 'lib/nokogiri/xml/attr.rb', line 55


def deconstruct_keys(keys)
  { name: name, value: value, namespace: namespace }
end

#inspect_attributes (private)

[ GitHub ]

# File 'lib/nokogiri/xml/attr.rb', line 61


def inspect_attributes
  [:name, :namespace, :value]
end

#to_s

Alias for Node#content.

[ GitHub ]

# File 'lib/nokogiri/xml/attr.rb', line 8


alias_method :to_s, :content

#value (writeonly)

Alias for Node#content.

[ GitHub ]

# File 'lib/nokogiri/xml/attr.rb', line 7


alias_method :value, :content

Class: Nokogiri::XML::Attr

Overview

Constant Summary

PP::Node - Included

Searchable - Included

::Nokogiri::ClassResolver - Included

Node - Inherited

Class Method Summary

Node - Inherited

Instance Attribute Summary

Node - Inherited

Instance Method Summary

Node - Inherited

::Nokogiri::ClassResolver - Included

Searchable - Included

PP::Node - Included

Constructor Details

.new(document, name)

Instance Attribute Details

#value=(content) (writeonly) Also known as: #content=

Instance Method Details

#deconstruct_keys(array_of_names) → Hash)

#inspect_attributes (private)

#to_s

#value (writeonly)

`PP::Node` - Included

`Searchable` - Included

`::Nokogiri::ClassResolver` - Included

`Node` - Inherited

`Node` - Inherited

`Node` - Inherited

`Node` - Inherited

`::Nokogiri::ClassResolver` - Included

`Searchable` - Included

`PP::Node` - Included