Class: Leptris::XML::Element

Inherits:
Node
  • Object
show all
Defined in:
lib/leptris/xml/element.rb

Instance Attribute Summary

Attributes inherited from Node

#c_ptr, #document

Instance Method Summary collapse

Methods inherited from Node

#<=>, #==, #cdata?, #child, #children, #comment?, #css_path, #element?, #element_children, #ensure_writable!, #first_element_child, #initialize, #inner_text, #inspect, #last_element_child, #line, #next_element, #next_sibling, #parent, #path, #previous_element, #previous_sibling, #processing_instruction?, #text, #text?, #traverse, #type, #unlink, wrap

Methods included from Searchable

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

Constructor Details

This class inherits a constructor from Leptris::XML::Node

Instance Method Details

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



31
32
33
 
# File 'lib/leptris/xml/element.rb', line 31

def [](key)
  Leptris::XML::FFI.leptris_element_attribute(@c_ptr, key.to_s)
end

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



37
38
39
40
41
42
 
# File 'lib/leptris/xml/element.rb', line 37

def []=(key, value)
  ensure_writable!
  Leptris::XML::FFI.check_status(
    Leptris::XML::FFI.leptris_element_set_attribute(@c_ptr, key.to_s, value.to_s))
  value
end

#add_child(node_or_markup) ⇒ Object Also known as: << 



201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
 
# File 'lib/leptris/xml/element.rb', line 201

def add_child(node_or_markup)
  ensure_writable!
  case node_or_markup
  when Leptris::XML::Node
    Leptris::XML::FFI.check_status(
      Leptris::XML::FFI.leptris_element_append_child(@c_ptr, node_or_markup.c_ptr))
    node_or_markup
  when String
    frag = Leptris::XML::DocumentFragment.parse(node_or_markup, @document)
    added = []
    frag.children.each do |n|
      Leptris::XML::FFI.check_status(
        Leptris::XML::FFI.leptris_element_append_child(@c_ptr, n.c_ptr))
      added << n
    end
    Leptris::XML::NodeSet.new(@document, added)
  else
    raise ArgumentError, "add_child expects a Node or String, got #{node_or_markup.class}"
  end
end

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



277
278
279
280
281
282
283
 
# File 'lib/leptris/xml/element.rb', line 277

def add_namespace_definition(prefix, href)
  ensure_writable!
  Leptris::XML::FFI.check_status(
    Leptris::XML::FFI.leptris_element_add_namespace_definition(
      @c_ptr, prefix.to_s, href.to_s))
  Leptris::XML::Namespace.new(self, href.to_s, prefix: prefix.nil? ? nil : prefix.to_s)
end

#add_next_sibling(node) ⇒ Object 



123
124
125
126
127
128
 
# File 'lib/leptris/xml/element.rb', line 123

def add_next_sibling(node)
  ensure_writable!
  Leptris::XML::FFI.check_status(
    Leptris::XML::FFI.leptris_element_insert_after(@c_ptr, node.c_ptr))
  node
end

#add_previous_sibling(node) ⇒ Object 



130
131
132
133
134
135
 
# File 'lib/leptris/xml/element.rb', line 130

def add_previous_sibling(node)
  ensure_writable!
  Leptris::XML::FFI.check_status(
    Leptris::XML::FFI.leptris_element_insert_before(@c_ptr, node.c_ptr))
  node
end

#attribute_nodes ⇒ Object 



106
107
108
 
# File 'lib/leptris/xml/element.rb', line 106

def attribute_nodes
  each_attribute.to_a
end

#attribute_ns(uri, local) ⇒ Object

Expanded-name attribute access (libleptris 1.8.0): URI + local name with XML Namespaces 1.0 semantics — the written prefix never matters, only what it resolves to through this element's in-scope declarations. uri nil/"" matches no-namespace attributes only; xmlns declarations are invisible.



55
56
57
58
 
# File 'lib/leptris/xml/element.rb', line 55

def attribute_ns(uri, local)
  Leptris::XML::FFI.leptris_element_attribute_ns(
    @c_ptr, uri&.to_s, local.to_s)
end

#attributes ⇒ Object 



98
99
100
101
102
103
104
 
# File 'lib/leptris/xml/element.rb', line 98

def attributes
  return @attributes if readonly_cached?(:@attributes)
  result = {}
  each_attribute { |attr| result[attr.name] = attr }
  @attributes = result if @document&.readonly?
  result
end

#canonicalize(version = Leptris::XML::FFI::C14N_1_0, inclusive_namespaces = nil, with_comments: false, exclusive: false, mode: nil) ⇒ Object Also known as: c14n 



262
263
264
265
266
267
268
269
270
271
272
273
274
 
# File 'lib/leptris/xml/element.rb', line 262

def canonicalize(version = Leptris::XML::FFI::C14N_1_0,
                 inclusive_namespaces = nil,
                 with_comments: false,
                 exclusive: false,
                 mode: nil)
  resolved_mode = mode || (exclusive ? Leptris::XML::FFI::C14N_MODE_EXCLUSIVE
                                     : Leptris::XML::FFI::C14N_MODE_CANONICAL)
  Leptris::XML::Serialization.canonicalize(
    Leptris::XML::FFI.method(:leptris_c14n_canonicalize_subtree_ex), @c_ptr,
    version: version, mode: resolved_mode,
    inclusive_namespaces: inclusive_namespaces,
    with_comments: with_comments)
end

#children=(node_or_nodes) ⇒ Object 



144
145
146
147
148
149
150
 
# File 'lib/leptris/xml/element.rb', line 144

def children=(node_or_nodes)
  ensure_writable!
  # Remove existing children, then attach the new ones in source order.
  Leptris::XML::FFI.check_status(
    Leptris::XML::FFI.leptris_element_remove_children(@c_ptr))
  Array(node_or_nodes).each { |n| add_child(n) }
end

#content ⇒ Object 



17
18
19
20
21
22
 
# File 'lib/leptris/xml/element.rb', line 17

def content
  return @content if readonly_cached?(:@content)
  Leptris::XML::FFI.leptris_element_text(@c_ptr).tap do |text|
    @content = text if @document&.readonly?
  end
end

#content=(new_content) ⇒ Object 



24
25
26
27
28
29
 
# File 'lib/leptris/xml/element.rb', line 24

def content=(new_content)
  ensure_writable!
  Leptris::XML::FFI.check_status(
    Leptris::XML::FFI.leptris_element_set_text(@c_ptr, new_content.to_s))
  new_content
end

#default_namespace=(href) ⇒ Object 



286
287
288
289
290
291
 
# File 'lib/leptris/xml/element.rb', line 286

def default_namespace=(href)
  ensure_writable!
  Leptris::XML::FFI.check_status(
    Leptris::XML::FFI.leptris_element_set_default_namespace(@c_ptr, href.to_s))
  href
end

#dup ⇒ Object Also known as: clone

Raises:



194
195
196
197
198
 
# File 'lib/leptris/xml/element.rb', line 194

def dup
  copy_ptr = Leptris::XML::FFI.leptris_element_copy(@c_ptr, @document.c_ptr)
  raise Leptris::XML::Error, "leptris_element_copy failed" if copy_ptr.null?
  Leptris::XML::Node.wrap(copy_ptr, @document)
end

#each_attribute ⇒ Object

Iterates the element's attributes via the v1.1.0 linked-list face (one FFI call per attribute; the name_at/value_at indexing API re-walks the list per index, making it O(n^2) per element). The C attribute handle rides along so Attr can serve the per-attribute namespace accessors (libleptris 1.8.0).



78
79
80
81
82
83
84
85
86
87
88
 
# File 'lib/leptris/xml/element.rb', line 78

def each_attribute
  return enum_for(:each_attribute) unless block_given?
  attr = Leptris::XML::FFI.leptris_element_first_attribute(@c_ptr)
  until attr.nil? || attr.null?
    name = Leptris::XML::FFI.leptris_attribute_get_name(attr)
    value = Leptris::XML::FFI.leptris_attribute_get_value(@c_ptr, attr)
    yield Leptris::XML::Attr.new(name, value, self, c_handle: attr)
    attr = Leptris::XML::FFI.leptris_attribute_next(attr)
  end
  self
end

#has_attribute_ns?(uri, local) ⇒ Boolean

Returns:

  • (Boolean) 


60
61
62
63
 
# File 'lib/leptris/xml/element.rb', line 60

def has_attribute_ns?(uri, local)
  Leptris::XML::FFI.leptris_element_has_attribute_ns(
    @c_ptr, uri&.to_s, local.to_s) != 0
end

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

Returns:

  • (Boolean) 


45
46
47
 
# File 'lib/leptris/xml/element.rb', line 45

def key?(name)
  Leptris::XML::FFI.leptris_element_has_attribute(@c_ptr, name.to_s) != 0
end

#keys ⇒ Object 



90
91
92
 
# File 'lib/leptris/xml/element.rb', line 90

def keys
  each_attribute.to_a.map(&:name)
end

#name ⇒ Object Also known as: node_name 



4
5
6
 
# File 'lib/leptris/xml/element.rb', line 4

def name
  @name ||= Leptris::XML::FFI.leptris_element_name(@c_ptr)
end

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



9
10
11
12
13
14
 
# File 'lib/leptris/xml/element.rb', line 9

def name=(new_name)
  ensure_writable!
  Leptris::XML::FFI.check_status(
    Leptris::XML::FFI.leptris_element_set_name(@c_ptr, new_name))
  @name = new_name
end

#namespace ⇒ Object 



223
224
225
226
227
228
229
230
231
232
 
# File 'lib/leptris/xml/element.rb', line 223

def namespace
  uri = Leptris::XML::FFI.leptris_element_namespace(@c_ptr)
  return nil if uri.nil? || uri.empty?
  # The resolved namespace is reached via this element's own prefix,
  # so carry it through: consumers that distinguish
  # {"p" => "urn:p"} from the default {"nil => "urn:p"} need it.
  prefix = Leptris::XML::FFI.leptris_element_prefix(@c_ptr)
  prefix = nil if prefix.nil? || prefix.empty?
  Leptris::XML::Namespace.new(self, uri, prefix: prefix)
end

#namespace_definitions ⇒ Object 



234
235
236
237
238
239
240
241
 
# File 'lib/leptris/xml/element.rb', line 234

def namespace_definitions
  count = Leptris::XML::FFI.leptris_element_namespace_count(@c_ptr)
  count.times.map do |i|
    prefix = Leptris::XML::FFI.leptris_element_namespace_decl_prefix(@c_ptr, i)
    uri = Leptris::XML::FFI.leptris_element_namespace_decl_uri(@c_ptr, i)
    Leptris::XML::Namespace.new(self, uri, prefix: prefix)
  end
end

#namespaces ⇒ Object 



243
244
245
246
247
248
249
250
251
252
253
254
 
# File 'lib/leptris/xml/element.rb', line 243

def namespaces
  scopes = {}
  node = self
  while node.is_a?(Leptris::XML::Element)
    node.namespace_definitions.each do |ns|
      key = ns.prefix ? "xmlns:#{ns.prefix}" : "xmlns"
      scopes[key] ||= ns.href
    end
    node = node.parent
  end
  scopes
end

#prefix ⇒ Object

The element's own namespace prefix (e.g. "foo" for foo:child/), or nil when the element has none.



112
113
114
 
# File 'lib/leptris/xml/element.rb', line 112

def prefix
  Leptris::XML::FFI.leptris_element_prefix(@c_ptr)
end

#prepend_child(node) ⇒ Object 



116
117
118
119
120
121
 
# File 'lib/leptris/xml/element.rb', line 116

def prepend_child(node)
  ensure_writable!
  Leptris::XML::FFI.check_status(
    Leptris::XML::FFI.leptris_element_prepend_child(@c_ptr, node.c_ptr))
  node
end

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



65
66
67
68
69
70
 
# File 'lib/leptris/xml/element.rb', line 65

def remove_attribute(name)
  ensure_writable!
  Leptris::XML::FFI.check_status(
    Leptris::XML::FFI.leptris_element_remove_attribute(@c_ptr, name.to_s))
  self
end

#remove_child(node) ⇒ Object 



137
138
139
140
141
142
 
# File 'lib/leptris/xml/element.rb', line 137

def remove_child(node)
  ensure_writable!
  Leptris::XML::FFI.check_status(
    Leptris::XML::FFI.leptris_element_remove_child(@c_ptr, node.c_ptr))
  node
end

#remove_namespace_definition(prefix) ⇒ Object 



293
294
295
296
297
298
 
# File 'lib/leptris/xml/element.rb', line 293

def remove_namespace_definition(prefix)
  ensure_writable!
  Leptris::XML::FFI.check_status(
    Leptris::XML::FFI.leptris_element_remove_namespace_definition(@c_ptr, prefix.to_s))
  self
end

#replace(new_node) ⇒ Object

Replace this element with new_node in the parent's child list. new_node must belong to the same document. Returns new_node.

Raises:



154
155
156
157
158
159
160
 
# File 'lib/leptris/xml/element.rb', line 154

def replace(new_node)
  parent = self.parent
  raise Leptris::XML::Error, "cannot replace a node with no parent" unless parent
  add_next_sibling(new_node)
  parent.remove_child(self)
  new_node
end

#swap(new_node) ⇒ Object

Like #replace but returns self for chaining.



163
164
165
166
 
# File 'lib/leptris/xml/element.rb', line 163

def swap(new_node)
  replace(new_node)
  self
end

#to_xml(indent: 0, no_decl: false, encoding: nil) ⇒ Object 



256
257
258
259
260
 
# File 'lib/leptris/xml/element.rb', line 256

def to_xml(indent: 0, no_decl: false, encoding: nil)
  Leptris::XML::Serialization.to_xml(
    Leptris::XML::FFI.method(:leptris_element_serialize_into), @c_ptr,
    indent: indent, no_decl: no_decl, encoding: encoding)
end

#values ⇒ Object 



94
95
96
 
# File 'lib/leptris/xml/element.rb', line 94

def values
  each_attribute.to_a.map(&:value)
end

#wrap(node_or_markup) ⇒ Object

Wrap this element in a new element parsed from markup or a dup of node. The wrapper takes this element's place in the tree, and this element becomes its only child. Returns self for chaining.

Raises:



171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
 
# File 'lib/leptris/xml/element.rb', line 171

def wrap(node_or_markup)
  wrapper =
    case node_or_markup
    when Leptris::XML::Element then node_or_markup.dup
    when String
      frag_doc = Leptris::XML::Document.parse(node_or_markup)
      frag_doc.root or raise Leptris::XML::Error, "wrap markup has no root element"
    else
      raise ArgumentError, "wrap expects a String or Element, got #{node_or_markup.class}"
    end

  parent = self.parent
  raise Leptris::XML::Error, "cannot wrap a node with no parent" unless parent

  # Insert wrapper at self's position, then move self into wrapper.
  # add_child moves self (unlinks from old parent first), so no explicit
  # remove_child needed — and trying to remove after the move corrupts
  # the C tree (libleptris silently handles non-child args badly).
  add_next_sibling(wrapper)
  wrapper.add_child(self)
  self
end