Class: Moxml::Adapter::Libxml

Inherits:
Base
  • Object
show all
Defined in:
lib/moxml/adapter/libxml.rb,
lib/moxml/adapter/libxml/entity_restorer.rb,
lib/moxml/adapter/libxml/entity_ref_registry.rb

Defined Under Namespace

Classes: DoctypeWrapper, EntityRefRegistry, EntityRestorer, LibXMLSAXBridge

Constant Summary

Constants inherited from Base

Base::ENTITY_MARKER, Base::ENTITY_MARKER_RE, Base::ENTITY_NAME_PATTERN, Base::ENTITY_NAME_RE, Base::SERIALIZED_ENTITY_MARKER_RE, Base::STANDARD_ENTITIES

Class Method Summary collapse

Methods inherited from Base

create_cdata, create_comment, create_declaration, create_doctype, create_element, create_entity_reference, create_namespace, create_processing_instruction, create_text, in_scope_namespaces, preprocess_entities, restore_entities, sax_supported?, set_attribute_value

Methods included from XmlUtils

#encode_entities, #normalize_xml_value, #validate_comment_content, #validate_declaration_encoding, #validate_declaration_standalone, #validate_declaration_version, #validate_element_name, #validate_entity_reference_name, #validate_pi_target, #validate_prefix, #validate_uri

Class Method Details

.actual_native(child_native, parent_native) ⇒ Object

LibXML’s doc.root= creates a new Ruby wrapper with different object_id. Return the actual root node so attachments are stored on the correct object.



1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
 
# File 'lib/moxml/adapter/libxml.rb', line 1081

def actual_native(child_native, parent_native)
  if parent_native.is_a?(::LibXML::XML::Document)
    pending = attachments.get(parent_native, :_pending_root_refresh)
    if pending && pending == child_native.object_id
      attachments.delete(parent_native, :_pending_root_refresh)
      return parent_native.root
    end
  end
  child_native
end

.add_child(element, child) ⇒ Object 



526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
 
# File 'lib/moxml/adapter/libxml.rb', line 526

def add_child(element, child)
  return unless element && child

  # Unwrap both element and child
  native_elem = unpatch_node(element)
  native_child = unpatch_node(child)

  # EntityReference wrappers can't go in LibXML's native tree.
  # Store them on the document for interleaved serialization.
  if child.is_a?(CustomizedLibxml::EntityReference)
    doc = native_elem.is_a?(::LibXML::XML::Document) ? native_elem : native_elem.doc
    entity_ref_registry(doc).register(native_elem, child)
    return
  end

  # For LibXML: if parent has a DEFAULT namespace (nil/empty prefix) and child is an element without a namespace,
  # explicitly set the child's namespace to match the parent's for XPath compatibility
  # NOTE: Prefixed namespaces are NOT inherited, only default namespaces.
  #
  # Reorder cheap-first: skip the expensive `.namespaces` fetches
  # entirely for non-element children (text, comment, cdata, PI),
  # which is roughly 30-50% of adds in a typical doc.
  if native_child.is_a?(::LibXML::XML::Node) && native_child.element? &&
      native_elem.is_a?(::LibXML::XML::Node) && native_elem.namespaces&.namespace &&
      (!native_child.namespaces.namespace || native_child.namespaces.namespace.href.to_s.empty?)

    parent_ns = native_elem.namespaces.namespace
    # Only set child's namespace if parent's namespace is DEFAULT (nil or empty prefix)
    if parent_ns.prefix.nil? || parent_ns.prefix.to_s.empty?
      native_child.namespaces.namespace = parent_ns
    end
  end

  if native_elem.is_a?(::LibXML::XML::Document)
    # For Declaration wrappers, store them for serialization
    if child.is_a?(CustomizedLibxml::Declaration)
      attachments.set(native_elem, :declaration, child)
      # Also store reference to parent document in the declaration
      child.parent_doc = native_elem
      return
    end

    # For DOCTYPE wrappers, store them for serialization
    if child.is_a?(DoctypeWrapper)
      attachments.set(native_elem, :doctype, child)
      return
    end

    # For document-level PIs, store them for serialization
    if child.is_a?(CustomizedLibxml::ProcessingInstruction)
      pis = attachments.get(native_elem, :pis) || []
      pis << child
      attachments.set(native_elem, :pis, pis)
      return
    end

    # For text nodes added to document, store them for serialization
    # Documents can't have text children in LibXML
    if child.is_a?(CustomizedLibxml::Text)
      texts = attachments.get(native_elem, :texts) || []
      texts << child
      attachments.set(native_elem, :texts, texts)
      return
    end

    # For documents, check if adding the first root element
    if native_elem.root.nil? && node_type(native_child) == :element
      # Set as root element
      native_elem.root = native_child
      # Flag for actual_native to refresh the wrapper's native reference
      attachments.set(native_elem, :_pending_root_refresh,
                      native_child.object_id)
    elsif native_elem.root
      # Document has root, add to it instead
      import_and_add(native_elem.doc, native_elem.root, native_child)
    end
  else
    import_and_add(native_elem.doc, native_elem, native_child)
    doc = native_elem.doc || native_elem
    entity_ref_registry(doc).append_native(native_elem)
  end
end

.add_next_sibling(node, sibling) ⇒ Object 



635
636
637
638
639
640
641
 
# File 'lib/moxml/adapter/libxml.rb', line 635

def add_next_sibling(node, sibling)
  return unless node && sibling

  native_node = unpatch_node(node)
  native_sibling = unpatch_node(sibling)
  native_node.next = native_sibling
end

.add_previous_sibling(node, sibling) ⇒ Object 



615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
 
# File 'lib/moxml/adapter/libxml.rb', line 615

def add_previous_sibling(node, sibling)
  return unless node && sibling

  native_node = unpatch_node(node)
  native_sibling = unpatch_node(sibling)

  # Special handling for document-level processing instructions
  # When adding a PI as sibling to root element, store it on document
  if sibling.is_a?(CustomizedLibxml::ProcessingInstruction) &&
      native_node.is_a?(::LibXML::XML::Node) && native_node.doc
    doc = native_node.doc
    pis = attachments.get(doc, :pis) || []
    pis << sibling
    attachments.set(doc, :pis, pis)
    return
  end

  native_node.prev = native_sibling
end

.append_child_sequence(element, type) ⇒ Object 



609
610
611
612
613
 
# File 'lib/moxml/adapter/libxml.rb', line 609

def append_child_sequence(element, type)
  seq = attachments.get(element, :child_sequence) || []
  seq << type
  attachments.set(element, :child_sequence, seq)
end

.at_xpath(node, expression, namespaces = nil) ⇒ Object 



887
888
889
890
 
# File 'lib/moxml/adapter/libxml.rb', line 887

def at_xpath(node, expression, namespaces = nil)
  results = xpath(node, expression, namespaces)
  results&.first
end

.attachments ⇒ Object 



70
71
72
 
# File 'lib/moxml/adapter/libxml.rb', line 70

def attachments
  @attachments ||= Moxml::NativeAttachment.new
end

.attribute_element(attr) ⇒ Object 



397
398
399
 
# File 'lib/moxml/adapter/libxml.rb', line 397

def attribute_element(attr)
  attr&.parent
end

.attribute_namespace(attr) ⇒ Object 



401
402
403
404
405
406
 
# File 'lib/moxml/adapter/libxml.rb', line 401

def attribute_namespace(attr)
  return nil unless attr
  return nil unless attr.is_a?(::LibXML::XML::Attr)

  attr.ns
end

.attributes(element) ⇒ Object 



382
383
384
385
386
387
388
389
390
391
392
393
394
395
 
# File 'lib/moxml/adapter/libxml.rb', line 382

def attributes(element)
  native_elem = unpatch_node(element)
  return [] unless native_elem
  unless native_elem.is_a?(::LibXML::XML::Node) && native_elem.element?
    return []
  end
  return [] unless native_elem.attributes?

  attrs = []
  native_elem.each_attr do |attr|
    attrs << attr unless attr.name.to_s.start_with?("xmlns")
  end
  attrs
end

.cdata_content(node) ⇒ Object 



736
737
738
739
740
741
742
743
744
745
746
747
 
# File 'lib/moxml/adapter/libxml.rb', line 736

def cdata_content(node)
  native_node = unpatch_node(node)
  content = native_node&.content
  # LibXML may HTML-escape CDATA content, un-escape it
  return nil unless content

  content.gsub("&quot;", '"')
    .gsub("&apos;", "'")
    .gsub("&lt;", "<")
    .gsub("&gt;", ">")
    .gsub("&amp;", "&")
end

.children(node) ⇒ Object 



303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
 
# File 'lib/moxml/adapter/libxml.rb', line 303

def children(node)
  native_node = unpatch_node(node)
  return [] unless native_node

  # Handle Document specially - it doesn't have children? method
  if native_node.is_a?(::LibXML::XML::Document)
    result = []

    # Include DOCTYPE if present
    doctype_wrapper = attachments.get(native_node, :doctype)
    result << doctype_wrapper if doctype_wrapper

    return result unless native_node.root

    result << patch_node(native_node.root)
    return result
  end

  result = []
  if native_node.children?
    native_node.each_child do |child|
      result << patch_node(child)
    end
  end

  # Include any EntityReference wrappers stored on the document
  doc = native_node.doc
  entity_refs = entity_ref_registry(doc).refs_for(native_node)
  result.concat(entity_refs) if entity_refs

  result
end

.comment_content(node) ⇒ Object 



755
756
757
758
 
# File 'lib/moxml/adapter/libxml.rb', line 755

def comment_content(node)
  native_node = unpatch_node(node)
  native_node&.content
end

.create_document(_native_doc = nil) ⇒ Object 



176
177
178
 
# File 'lib/moxml/adapter/libxml.rb', line 176

def create_document(_native_doc = nil)
  ::LibXML::XML::Document.new
end

.create_native_cdata(content, _owner_doc = nil) ⇒ Object 



197
198
199
200
 
# File 'lib/moxml/adapter/libxml.rb', line 197

def create_native_cdata(content, _owner_doc = nil)
  native = ::LibXML::XML::Node.new_cdata(content.to_s)
  CustomizedLibxml::Cdata.new(native)
end

.create_native_comment(content, _owner_doc = nil) ⇒ Object 



202
203
204
205
 
# File 'lib/moxml/adapter/libxml.rb', line 202

def create_native_comment(content, _owner_doc = nil)
  native = ::LibXML::XML::Node.new_comment(content.to_s)
  CustomizedLibxml::Comment.new(native)
end

.create_native_declaration(version, encoding, standalone) ⇒ Object 



212
213
214
215
216
 
# File 'lib/moxml/adapter/libxml.rb', line 212

def create_native_declaration(version, encoding, standalone)
  doc = create_document
  # Return a Declaration wrapper with explicit parameters
  CustomizedLibxml::Declaration.new(doc, version, encoding, standalone)
end

.create_native_doctype(name, external_id, system_id) ⇒ Object 



218
219
220
221
222
223
 
# File 'lib/moxml/adapter/libxml.rb', line 218

def create_native_doctype(name, external_id, system_id)
  # LibXML::XML::Dtd.new has bizarre parameter order, so we just
  # store values directly in our wrapper
  DoctypeWrapper.new(create_document, name.to_s, external_id&.to_s,
                     system_id&.to_s)
end

.create_native_element(name, _owner_doc = nil) ⇒ Object 



180
181
182
 
# File 'lib/moxml/adapter/libxml.rb', line 180

def create_native_element(name, _owner_doc = nil)
  ::LibXML::XML::Node.new(name.to_s)
end

.create_native_entity_reference(name) ⇒ Object 



189
190
191
 
# File 'lib/moxml/adapter/libxml.rb', line 189

def create_native_entity_reference(name)
  CustomizedLibxml::EntityReference.new(name)
end

.create_native_namespace(element, prefix, uri) ⇒ Object 



789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
 
# File 'lib/moxml/adapter/libxml.rb', line 789

def create_native_namespace(element, prefix, uri)
  native_elem = unpatch_node(element)
  return nil unless native_elem

  ns = ::LibXML::XML::Namespace.new(
    native_elem,
    prefix.to_s.empty? ? nil : prefix.to_s,
    uri.to_s,
  )

  # For default namespace (nil/empty prefix), set it as the element's namespace
  native_elem.namespaces.namespace = ns if prefix.to_s.empty?

  ns
end

.create_native_processing_instruction(target, content) ⇒ Object 



207
208
209
210
 
# File 'lib/moxml/adapter/libxml.rb', line 207

def create_native_processing_instruction(target, content)
  native = ::LibXML::XML::Node.new_pi(target.to_s, content.to_s)
  CustomizedLibxml::ProcessingInstruction.new(native)
end

.create_native_text(content, _owner_doc = nil) ⇒ Object 



184
185
186
187
 
# File 'lib/moxml/adapter/libxml.rb', line 184

def create_native_text(content, _owner_doc = nil)
  native = ::LibXML::XML::Node.new_text(content.to_s)
  CustomizedLibxml::Text.new(native)
end

.declaration_attribute(node, name) ⇒ Object 



257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
 
# File 'lib/moxml/adapter/libxml.rb', line 257

def declaration_attribute(node, name)
  return nil unless node

  # Handle Declaration wrapper
  if node.is_a?(CustomizedLibxml::Declaration)
    case name
    when "version"
      node.version
    when "encoding"
      node.encoding
    when "standalone"
      node.standalone # Returns "yes", "no", or nil
    end
  else
    # Fallback for native documents
    case name
    when "version"
      node.version
    when "encoding"
      enc = node.encoding
      enc ? encoding_to_string(enc) : nil
    when "standalone"
      node.standalone? ? "yes" : nil
    end
  end
end

.doctype_external_id(native) ⇒ Object 



854
855
856
 
# File 'lib/moxml/adapter/libxml.rb', line 854

def doctype_external_id(native)
  native.external_id
end

.doctype_name(native) ⇒ Object

Doctype accessor methods



849
850
851
852
 
# File 'lib/moxml/adapter/libxml.rb', line 849

def doctype_name(native)
  # LibXML uses DoctypeWrapper which stores the values
  native.name
end

.doctype_system_id(native) ⇒ Object 



858
859
860
 
# File 'lib/moxml/adapter/libxml.rb', line 858

def doctype_system_id(native)
  native.system_id
end

.document(node) ⇒ Object 



366
367
368
369
370
371
372
373
374
375
 
# File 'lib/moxml/adapter/libxml.rb', line 366

def document(node)
  native_node = unpatch_node(node)
  return nil unless native_node

  # Handle documents themselves
  return native_node if native_node.is_a?(::LibXML::XML::Document)

  # For other nodes, return their document
  native_node.doc
end

.duplicate_node(node) ⇒ Object

Shallow duplication: copies the node itself (name, attrs, namespaces) but NOT its descendants. This is what DocumentBuilder needs — it walks the source tree and re-adds children one at a time via add_child, so a deep copy here would be done only to be stripped by replace_children, then rebuilt — O(N²) waste on parse.

For callers that need a true deep copy (e.g. the import_and_add fallback when LibXML can’t move the subtree directly), use deep_duplicate_node.



998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
 
# File 'lib/moxml/adapter/libxml.rb', line 998

def duplicate_node(node)
  return nil unless node

  native_node = unpatch_node(node)

  case node_type(node)
  when :doctype
    if node.is_a?(DoctypeWrapper)
      DoctypeWrapper.new(
        create_document,
        node.name,
        node.external_id,
        node.system_id,
      )
    else
      node
    end
  when :element
    shallow_duplicate_element(native_node)
  when :text
    ::LibXML::XML::Node.new_text(native_node.content)
  when :cdata
    ::LibXML::XML::Node.new_cdata(native_node.content)
  when :comment
    ::LibXML::XML::Node.new_comment(native_node.content)
  when :processing_instruction
    ::LibXML::XML::Node.new_pi(native_node.name, native_node.content)
  else
    native_node.dup
  end
end

.entity_reference_name(node) ⇒ Object 



193
194
195
 
# File 'lib/moxml/adapter/libxml.rb', line 193

def entity_reference_name(node)
  node.name if node.is_a?(CustomizedLibxml::EntityReference)
end

.get_attribute(element, name) ⇒ Object 



446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
 
# File 'lib/moxml/adapter/libxml.rb', line 446

def get_attribute(element, name)
  native_elem = unpatch_node(element)
  return nil unless native_elem
  return nil unless native_elem.attributes?

  attr = native_elem.attributes.get_attribute(name.to_s)
  return nil unless attr

  # Extend the attribute with to_xml method for proper escaping
  attr.define_singleton_method(:to_xml) do
    escaped = value.to_s
      .gsub("&", "&amp;")
      .gsub("<", "&lt;")
      .gsub(">", "&gt;")
      .gsub("\"", "&quot;")
    "#{name} = #{escaped}"
  end
  attr
end

.get_attribute_value(element, name) ⇒ Object 



466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
 
# File 'lib/moxml/adapter/libxml.rb', line 466

def get_attribute_value(element, name)
  native_elem = unpatch_node(element)
  return nil unless native_elem

  # Try to get the attribute with the given name (handles namespaced attrs)
  value = native_elem[name.to_s]
  return value if value

  # If name contains ':', try to get as namespaced attribute
  if name.to_s.include?(":")
    prefix, local_name = name.to_s.split(":", 2)
    # Try to find attribute by namespace
    if native_elem.attributes?
      native_elem.each_attr do |attr|
        if attr.name == local_name || attr.name == name.to_s
          # Check if attribute's namespace matches the prefix
          if attr.ns && attr.ns.prefix == prefix
            return attr.value
          elsif attr.name == name.to_s
            # Fallback: attribute name includes the prefix
            return attr.value
          end
        end
      end
    end
  end

  nil
end

.has_declaration?(native_doc, wrapper) ⇒ Boolean

Returns:

  • (Boolean) 


1070
1071
1072
1073
1074
1075
1076
1077
 
# File 'lib/moxml/adapter/libxml.rb', line 1070

def has_declaration?(native_doc, wrapper)
  decl = attachments.get(native_doc, :declaration)
  if decl
    !decl.removed
  else
    wrapper.has_xml_declaration
  end
end

.inner_text(node) ⇒ Object 



719
720
721
722
723
724
725
726
727
728
729
 
# File 'lib/moxml/adapter/libxml.rb', line 719

def inner_text(node)
  native_node = unpatch_node(node)
  return "" unless native_node
  return "" unless native_node.children?

  result = []
  native_node.each_child do |child|
    result << child.content if child.text?
  end
  result.join
end

.namespace(element) ⇒ Object 



812
813
814
815
816
817
818
819
820
 
# File 'lib/moxml/adapter/libxml.rb', line 812

def namespace(element)
  native_elem = unpatch_node(element)
  return nil unless native_elem

  # Return ONLY the element's own namespace
  # Do NOT inherit parent namespaces (prefixed namespaces are NOT inherited)
  # Only default namespaces are inherited during element creation by LibXML
  native_elem.namespaces&.namespace
end

.namespace_definitions(node) ⇒ Object 



830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
 
# File 'lib/moxml/adapter/libxml.rb', line 830

def namespace_definitions(node)
  native_node = unpatch_node(node)
  return [] unless native_node
  return [] unless native_node.is_a?(::LibXML::XML::Node)

  namespaces = native_node.namespaces
  return [] unless namespaces

  namespace_list =
    if namespaces.respond_to?(:definitions)
      namespaces.definitions
    else
      namespaces
    end

  namespace_list.to_a
end

.namespace_prefix(namespace) ⇒ Object 



822
823
824
 
# File 'lib/moxml/adapter/libxml.rb', line 822

def namespace_prefix(namespace)
  namespace&.prefix
end

.namespace_uri(namespace) ⇒ Object 



826
827
828
 
# File 'lib/moxml/adapter/libxml.rb', line 826

def namespace_uri(namespace)
  namespace&.href
end

.next_sibling(node) ⇒ Object 



342
343
344
345
346
347
348
349
350
351
352
 
# File 'lib/moxml/adapter/libxml.rb', line 342

def next_sibling(node)
  native_node = unpatch_node(node)
  current = native_node&.next
  while current
    # Skip whitespace-only text nodes
    break unless blank_text_node?(current)

    current = current.next
  end
  current ? patch_node(current) : nil
end

.node_name(node) ⇒ Object 



247
248
249
250
 
# File 'lib/moxml/adapter/libxml.rb', line 247

def node_name(node)
  native_node = unpatch_node(node)
  native_node&.name
end

.node_type(node) ⇒ Object 



225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
 
# File 'lib/moxml/adapter/libxml.rb', line 225

def node_type(node)
  return :unknown unless node

  # Fast path: native libxml nodes are the vast majority during
  # parse traversal (DocumentBuilder visits raw libxml children).
  # Skip the wrapper checks below for them.
  if node.is_a?(::LibXML::XML::Node)
    return NATIVE_NODE_TYPE_MAP[node.node_type] || :unknown
  end
  return :document if node.is_a?(::LibXML::XML::Document)

  wrapper_type = WRAPPER_NODE_TYPE_MAP[node.class]
  return wrapper_type if wrapper_type

  # Duck-typed fallback for libxml types that aren't ::Node
  # subclasses but still expose node_type (e.g. ::Attr).
  native = unpatch_node(node)
  return :unknown unless native.respond_to?(:node_type)

  NATIVE_NODE_TYPE_MAP[native.node_type] || :unknown
end

.parent(node) ⇒ Object 



336
337
338
339
340
 
# File 'lib/moxml/adapter/libxml.rb', line 336

def parent(node)
  native_node = unpatch_node(node)
  parent_node = native_node&.parent
  parent_node ? patch_node(parent_node) : nil
end

.parse(xml, options = {}, _context = nil) ⇒ Object 



78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
 
# File 'lib/moxml/adapter/libxml.rb', line 78

def parse(xml, options = {}, _context = nil)
  # LibXML doesn't preserve DOCTYPE during parsing, so we need to extract it manually
  xml_string = if xml.is_a?(String)
                 xml
               elsif xml.is_a?(IO) || xml.is_a?(StringIO)
                 xml.read
               else
                 xml.to_s
               end

  # Preprocess entities before parsing.
  # This converts the string to UTF-8; LibXML will use the encoding
  # parameter or XML declaration for byte interpretation.
  xml_string = preprocess_entities(xml_string)

  # Extract DOCTYPE before parsing
  doctype_match = xml_string.match(/<!DOCTYPE\s+(\S+)(?:\s+PUBLIC\s+"([^"]+)"\s+"([^"]+)"|  \s+SYSTEM\s+"([^"]+)")?\s*>/i)

  native_doc = begin
    # Handle both string and file inputs
    parser = ::LibXML::XML::Parser.string(xml_string)
    parser.parse
  rescue ::LibXML::XML::Error => e
    if options[:strict]
      line = e.line
      raise Moxml::ParseError.new(
        e.message,
        line: line,
        column: nil,
        source: xml_string[0..100],
      )
    end
    # Return empty document for non-strict mode
    create_document
  end

  # Store DOCTYPE if found
  if doctype_match
    name = doctype_match[1]
    external_id = doctype_match[2]
    system_id = doctype_match[3] || doctype_match[4]

    doctype_wrapper = DoctypeWrapper.new(
      native_doc,
      name,
      external_id,
      system_id,
    )
    attachments.set(native_doc, :doctype, doctype_wrapper)
  end

  ctx = _context || Context.new(:libxml)
  # Single parse path: wrap libxml's already-complete C-parsed tree
  # directly (same pattern as nokogiri/ox). The previous
  # DocumentBuilder.build path walked the entire parsed tree and
  # re-added every node to a fresh moxml-managed document, which
  # made parse O(N) Ruby work on top of an already-complete parse.
  # Doctype/declaration/PI attachments set above remain on
  # native_doc, so the serialize path still sees them.
  #
  # restore_entities is handled as a post-processing case after
  # the wrap, NOT by branching into a different builder. This way
  # any new parse-time logic only has to be added to this one
  # path; the restoration walk is just one of potentially several
  # post-processing steps and doesn't fork the construction.
  doc = Document.new(native_doc, ctx)
  EntityRestorer.new(doc).run if ctx.config.restore_entities
  doc
end

.patch_node(node, _parent = nil) ⇒ Object 



1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
 
# File 'lib/moxml/adapter/libxml.rb', line 1030

def patch_node(node, _parent = nil)
  # Wrap native LibXML nodes in our wrapper classes
  return node if node.nil?
  return node if node.is_a?(CustomizedLibxml::Node)

  case node_type(node)
  when :element
    CustomizedLibxml::Element.new(node)
  when :text
    CustomizedLibxml::Text.new(node)
  when :cdata
    CustomizedLibxml::Cdata.new(node)
  when :comment
    CustomizedLibxml::Comment.new(node)
  when :processing_instruction
    CustomizedLibxml::ProcessingInstruction.new(node)
  else
    node
  end
end

.prepare_for_new_document(node, target_doc) ⇒ Object 



1061
1062
1063
1064
1065
1066
1067
1068
 
# File 'lib/moxml/adapter/libxml.rb', line 1061

def prepare_for_new_document(node, target_doc)
  return node unless node && target_doc

  # For LibXML, we need to duplicate ALL nodes to avoid
  # document ownership issues. Simply importing doesn't work
  # because nodes from the parsed document still have references.
  duplicate_node(node)
end

.previous_sibling(node) ⇒ Object 



354
355
356
357
358
359
360
361
362
363
364
 
# File 'lib/moxml/adapter/libxml.rb', line 354

def previous_sibling(node)
  native_node = unpatch_node(node)
  current = native_node&.prev
  while current
    # Skip whitespace-only text nodes
    break unless blank_text_node?(current)

    current = current.prev
  end
  current ? patch_node(current) : nil
end

.processing_instruction_content(node) ⇒ Object 



770
771
772
773
774
775
776
777
778
779
780
781
 
# File 'lib/moxml/adapter/libxml.rb', line 770

def processing_instruction_content(node)
  native_node = unpatch_node(node)
  content = native_node&.content
  # LibXML may HTML-escape the content, un-escape it
  return nil unless content

  content.gsub("&quot;", '"')
    .gsub("&apos;", "'")
    .gsub("&lt;", "<")
    .gsub("&gt;", ">")
    .gsub("&amp;", "&")
end

.processing_instruction_target(node) ⇒ Object 



765
766
767
768
 
# File 'lib/moxml/adapter/libxml.rb', line 765

def processing_instruction_target(node)
  native_node = unpatch_node(node)
  native_node&.name
end

.remove(node) ⇒ Object 



643
644
645
646
647
648
649
650
651
652
 
# File 'lib/moxml/adapter/libxml.rb', line 643

def remove(node)
  # Handle Declaration wrapper - mark as removed on document
  if node.is_a?(CustomizedLibxml::Declaration)
    node.removed = true
    return
  end

  native_node = unpatch_node(node)
  native_node&.remove!
end

.remove_attribute(element, name) ⇒ Object 



496
497
498
499
500
501
502
503
 
# File 'lib/moxml/adapter/libxml.rb', line 496

def remove_attribute(element, name)
  native_elem = unpatch_node(element)
  return unless native_elem
  return unless native_elem.attributes?

  attr = native_elem.attributes.get_attribute(name.to_s)
  attr&.remove!
end

.replace(node, new_node) ⇒ Object 



654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
 
# File 'lib/moxml/adapter/libxml.rb', line 654

def replace(node, new_node)
  native_node = unpatch_node(node)
  native_new = unpatch_node(new_node)
  parent = native_node&.parent
  return unless parent && native_new

  # Special handling for text nodes - LibXML's sibling manipulation
  # doesn't work reliably for text nodes. Instead, use parent.content
  # for text-to-text replacement
  if native_node.text? && native_new.text?
    parent.content = native_new.content
    return
  end

  # Save the prev/next siblings before removing
  prev_sibling = native_node.prev
  next_sibling = native_node.next

  # Import if needed for cross-document operations
  parent_doc = parent.is_a?(::LibXML::XML::Node) ? parent.doc : nil

  # Use import_and_add to properly handle document adoption
  import_and_add(parent_doc, parent, native_new)

  # Now adjust the position - move new node to where old node was
  if prev_sibling
    # Insert after the previous sibling
    prev_sibling.next = native_new
  end
  if next_sibling
    # Insert before the next sibling
    next_sibling.prev = native_new
  end

  # Finally remove the old node
  native_node.remove!
end

.replace_children(element, children) ⇒ Object 



692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
 
# File 'lib/moxml/adapter/libxml.rb', line 692

def replace_children(element, children)
  native_elem = unpatch_node(element)
  return unless native_elem

  # Remove all existing children first
  native_elem.each_child(&:remove!)

  # Get the element's document for importing
  doc = native_elem.is_a?(::LibXML::XML::Node) ? native_elem.doc : nil

  children.each do |c|
    native_c = unpatch_node(c)

    # Use import_and_add helper which handles all the edge cases
    import_and_add(doc, native_elem, native_c)
  end
end

.root(document) ⇒ Object 



377
378
379
380
 
# File 'lib/moxml/adapter/libxml.rb', line 377

def root(document)
  native_doc = unpatch_node(document)
  native_doc&.root
end

.sax_parse(xml, handler) ⇒ void

This method returns an undefined value.

SAX parsing implementation for LibXML

Parameters:



153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
 
# File 'lib/moxml/adapter/libxml.rb', line 153

def sax_parse(xml, handler)
  # Create bridge that translates LibXML SAX to Moxml SAX
  bridge = LibXMLSAXBridge.new(handler)

  # Create LibXML SAX parser
  parser = ::LibXML::XML::SaxParser.string(xml.to_s)

  # Set callbacks
  parser.callbacks = bridge

  # Parse
  parser.parse
rescue ::LibXML::XML::Error => e
  line = e.line
  column = begin
    e.column
  rescue StandardError
    nil
  end
  error = Moxml::ParseError.new(e.message, line: line, column: column)
  handler.on_error(error)
end

.serialize(node, options = {}) ⇒ Object 



892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
 
# File 'lib/moxml/adapter/libxml.rb', line 892

def serialize(node, options = {})
  # FIRST: Check if node is any kind of wrapper with custom to_xml
  if node.is_a?(CustomizedLibxml::Node) || node.is_a?(DoctypeWrapper)
    return node.to_xml
  end

  native_node = unpatch_node(node)
  return "" unless native_node

  if native_node.is_a?(::LibXML::XML::Document)
    output = +""

    # Check if we should include declaration
    # Priority: explicit no_declaration option > default (include)
    should_include_decl = if options.key?(:no_declaration)
                            !options[:no_declaration]
                          else
                            # Default: include declaration
                            true
                          end

    if should_include_decl
      # Check if declaration was explicitly managed
      decl = attachments.get(native_node, :declaration)
      if decl
        # Only output declaration if it exists and wasn't removed
        output << decl.to_xml unless decl.removed
      else
        # No declaration stored - create default
        version = native_node.version || "1.0"
        encoding_val = options[:encoding] ||
          encoding_to_string(native_node.encoding) ||
          "UTF-8"

        # Don't add standalone="yes" by default - only if explicitly set
        decl = CustomizedLibxml::Declaration.new(
          native_node,
          version,
          encoding_val,
          nil, # No standalone by default
        )
        attachments.set(native_node, :declaration, decl)
        output << decl.to_xml
      end
    end

    # Add DOCTYPE if stored on document
    doctype_wrapper = attachments.get(native_node, :doctype)
    if doctype_wrapper
      output << "\n" unless output.empty?
      output << doctype_wrapper.to_xml
    end

    # Add document-level processing instructions if stored
    pis = attachments.get(native_node, :pis)
    if pis && !pis.empty?
      pis.each do |pi|
        output << "\n" unless output.empty?
        output << pi.to_xml
      end
    end

    # Add text nodes if stored (for documents without root)
    texts = attachments.get(native_node, :texts)
    if texts && !texts.empty?
      texts.each do |text|
        output << "\n" unless output.empty?
        output << text.to_xml
      end
    end

    if native_node.root
      indent_size = options[:indent].is_a?(Integer) && options[:indent].positive? ? options[:indent] : 0
      # Custom serializer emits newlines AND indentation directly —
      # no separate add_newlines_to_xml / indent_xml passes.
      # `eref_active` is computed once here and threaded through the
      # recursion so that the per-element `attachments.key?` Monitor
      # sync only fires for docs that actually have entity refs.
      eref_active = entity_ref_registry(native_node).active?
      root_output = serialize_element_with_namespaces(
        native_node.root,
        true,
        indent_size,
        0,
        eref_active: eref_active,
      )

      output << "\n" << root_output unless output.empty?
      output << root_output if output.empty?
    end

    output
  else
    serialize_element_with_namespaces(native_node, true)
  end
end

.set_attribute(element, name, value) ⇒ Object 



408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
 
# File 'lib/moxml/adapter/libxml.rb', line 408

def set_attribute(element, name, value)
  native_elem = unpatch_node(element)
  return unless native_elem

  name_str = name.to_s
  value_str = value.to_s

  # Check if attribute name contains namespace prefix
  if name_str.include?(":")
    prefix, local_name = name_str.split(":", 2)

    # Find the namespace with the given prefix
    ns = find_namespace_by_prefix(native_elem, prefix)

    if ns
      # LibXML::XML::Attr.new accepts namespace as third parameter
      # First remove existing attribute if present
      existing = native_elem.attributes.get_attribute(name_str)
      existing&.remove!

      # Create new attribute with namespace
      # Attr.new(node, name, value, ns)
      ::LibXML::XML::Attr.new(native_elem, local_name, value_str, ns)

      # Return the created attribute

    else
      # Namespace not found, set as regular attribute
      native_elem[name_str] = value_str
      native_elem.attributes.get_attribute(name_str)
    end
  else
    # Regular attribute without namespace
    native_elem[name_str] = value_str
    native_elem.attributes.get_attribute(name_str)
  end
end

.set_attribute_name(attribute, new_name) ⇒ Object 



505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
 
# File 'lib/moxml/adapter/libxml.rb', line 505

def set_attribute_name(attribute, new_name)
  # LibXML attributes cannot be renamed directly
  # We must work at the element level
  return unless attribute

  # Get values FIRST before any removal
  old_name = attribute.name
  value = attribute.value
  element = attribute.parent
  return unless element

  # Remove old attribute via element
  element.attributes.get_attribute(old_name)&.remove!

  # Add new attribute with same value
  element[new_name.to_s] = value

  # Return the new attribute
  element.attributes.get_attribute(new_name.to_s)
end

.set_cdata_content(node, content) ⇒ Object 



749
750
751
752
753
 
# File 'lib/moxml/adapter/libxml.rb', line 749

def set_cdata_content(node, content)
  native_node = unpatch_node(node)
  # CDATA content should NOT be escaped
  native_node.content = content.to_s if native_node
end

.set_comment_content(node, content) ⇒ Object 



760
761
762
763
 
# File 'lib/moxml/adapter/libxml.rb', line 760

def set_comment_content(node, content)
  native_node = unpatch_node(node)
  native_node.content = content.to_s if native_node
end

.set_declaration_attribute(node, name, value) ⇒ Object 



284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
 
# File 'lib/moxml/adapter/libxml.rb', line 284

def set_declaration_attribute(node, name, value)
  return unless node

  # Handle Declaration wrapper
  return unless node.is_a?(CustomizedLibxml::Declaration)

  case name
  when "version"
    node.version = value
  when "encoding"
    node.encoding = value
  when "standalone"
    # Pass the value directly - Declaration handles the conversion
    node.standalone = value
  end

  # Native documents are read-only, do nothing for them
end

.set_namespace(element, ns) ⇒ Object 



805
806
807
808
809
810
 
# File 'lib/moxml/adapter/libxml.rb', line 805

def set_namespace(element, ns)
  native_elem = unpatch_node(element)
  return unless native_elem && ns

  native_elem.namespaces.namespace = ns
end

.set_node_name(node, name) ⇒ Object 



252
253
254
255
 
# File 'lib/moxml/adapter/libxml.rb', line 252

def set_node_name(node, name)
  native_node = unpatch_node(node)
  native_node.name = name.to_s if native_node
end

.set_processing_instruction_content(node, content) ⇒ Object 



783
784
785
786
787
 
# File 'lib/moxml/adapter/libxml.rb', line 783

def set_processing_instruction_content(node, content)
  native_node = unpatch_node(node)
  # Store raw content - LibXML will escape it
  native_node.content = content.to_s if native_node
end

.set_root(doc, element) ⇒ Object 



74
75
76
 
# File 'lib/moxml/adapter/libxml.rb', line 74

def set_root(doc, element)
  doc.root = element
end

.set_text_content(node, content) ⇒ Object 



731
732
733
734
 
# File 'lib/moxml/adapter/libxml.rb', line 731

def set_text_content(node, content)
  native_node = unpatch_node(node)
  native_node.content = content.to_s if native_node
end

.text_content(node) ⇒ Object 



710
711
712
713
714
715
716
717
 
# File 'lib/moxml/adapter/libxml.rb', line 710

def text_content(node)
  return "" if node.is_a?(CustomizedLibxml::EntityReference)

  native_node = unpatch_node(node)
  return nil unless native_node

  native_node.content
end

.unpatch_node(node) ⇒ Object 



1051
1052
1053
1054
1055
1056
1057
1058
1059
 
# File 'lib/moxml/adapter/libxml.rb', line 1051

def unpatch_node(node)
  # Unwrap to get native LibXML node
  case node
  when CustomizedLibxml::Node, CustomizedLibxml::Declaration, DoctypeWrapper
    node.native
  else
    node
  end
end

.xpath(node, expression, namespaces = nil) ⇒ Object 



862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
 
# File 'lib/moxml/adapter/libxml.rb', line 862

def xpath(node, expression, namespaces = nil)
  native_node = unpatch_node(node)
  return [] unless native_node

  # Build namespace context for LibXML
  # LibXML requires ALL prefixes in the XPath to be registered
  ns_context = build_xpath_namespaces(native_node, namespaces)

  results = if ns_context.empty?
              native_node.find(expression).to_a
            else
              native_node.find(expression, ns_context).to_a
            end

  # Wrap results
  results.map { |n| patch_node(n) }
rescue ::LibXML::XML::Error => e
  raise Moxml::XPathError.new(
    e.message,
    expression: expression,
    adapter: "LibXML",
    node: node,
  )
end