Class: Moxml::Adapter::Libxml

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

Defined Under Namespace

Classes: DoctypeWrapper, LibXMLSAXBridge

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, 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

.add_child(element, child) ⇒ Object 



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# File 'lib/moxml/adapter/libxml.rb', line 494

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 alongside native children via instance variable.
  if child.is_a?(CustomizedLibxml::EntityReference)
    refs = native_elem.instance_variable_get(:@moxml_entity_refs) || []
    refs << child
    native_elem.instance_variable_set(:@moxml_entity_refs, refs)
    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
  if native_elem.is_a?(::LibXML::XML::Node) && native_elem.namespaces&.namespace &&
      native_child.is_a?(::LibXML::XML::Node) && native_child.element? &&
      (!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)
      native_elem.instance_variable_set(:@moxml_declaration, child)
      # Also store reference to parent document in the declaration
      child.instance_variable_set(:@parent_doc, native_elem)
      return
    end

    # For DOCTYPE wrappers, store them for serialization
    if child.is_a?(DoctypeWrapper)
      native_elem.instance_variable_set(:@moxml_doctype, child)
      return
    end

    # For document-level PIs, store them for serialization
    if child.is_a?(CustomizedLibxml::ProcessingInstruction)
      pis = native_elem.instance_variable_get(:@moxml_pis) || []
      pis << child
      native_elem.instance_variable_set(:@moxml_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 = native_elem.instance_variable_get(:@moxml_texts) || []
      texts << child
      native_elem.instance_variable_set(:@moxml_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
    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)
  end
end

.add_newlines_to_xml(xml_string) ⇒ Object 



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# File 'lib/moxml/adapter/libxml.rb', line 950

def add_newlines_to_xml(xml_string)
  # Add newlines between XML elements for proper indentation
  # But don't add newlines between opening and immediate closing tags (e.g., <tag></tag>)
  # And most importantly, don't add newlines inside CDATA sections

  # First, protect CDATA sections by replacing them with placeholders
  # Manual scanning guarantees O(n) complexity with no backtracking (ReDoS-safe)
  cdata_sections = []
  result = +""
  pos = 0

  loop do
    # Find next CDATA start
    cdata_start = xml_string.index("<![CDATA[", pos)

    if cdata_start
      # Copy everything before CDATA
      result << xml_string[pos...cdata_start]

      # Find CDATA end
      cdata_content_start = cdata_start + 9 # Length of "<![CDATA["
      cdata_end = xml_string.index("]]>", cdata_content_start)

      if cdata_end
        # Extract full CDATA including markers
        full_cdata_end = cdata_end + 3 # Include "]]>"
        cdata_section = xml_string[cdata_start...full_cdata_end]

        # Store and add placeholder
        cdata_sections << cdata_section
        result << "__CDATA_PLACEHOLDER_#{cdata_sections.length - 1}__"

        # Continue after this CDATA
        pos = full_cdata_end
      else
        # Malformed CDATA (no closing "]]>") - copy as-is
        result << xml_string[cdata_start..]
        break
      end
    else
      # No more CDATA sections - copy rest
      result << xml_string[pos..]
      break
    end
  end

  protected = result

  # Add newlines between elements (but not in CDATA - already protected)
  with_newlines = protected.gsub(%r{(<[^>]+)>(?=<(?!/))}, "\\1>\n")

  # Restore CDATA sections
  cdata_sections.each_with_index do |cdata, index|
    with_newlines.sub!("__CDATA_PLACEHOLDER_#{index}__", cdata)
  end

  with_newlines
end

.add_next_sibling(node, sibling) ⇒ Object 



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# File 'lib/moxml/adapter/libxml.rb', line 589

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 



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# File 'lib/moxml/adapter/libxml.rb', line 569

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 = doc.instance_variable_get(:@moxml_pis) || []
    pis << sibling
    doc.instance_variable_set(:@moxml_pis, pis)
    return
  end

  native_node.prev = native_sibling
end

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



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# File 'lib/moxml/adapter/libxml.rb', line 842

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

.attribute_element(attr) ⇒ Object 



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# File 'lib/moxml/adapter/libxml.rb', line 365

def attribute_element(attr)
  attr&.parent
end

.attribute_namespace(attr) ⇒ Object 



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# File 'lib/moxml/adapter/libxml.rb', line 369

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

  attr.ns
end

.attributes(element) ⇒ Object 



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# File 'lib/moxml/adapter/libxml.rb', line 350

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 



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# File 'lib/moxml/adapter/libxml.rb', line 699

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 



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# File 'lib/moxml/adapter/libxml.rb', line 267

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
    if native_node.instance_variable_defined?(:@moxml_doctype)
      doctype_wrapper = native_node.instance_variable_get(:@moxml_doctype)
      result << doctype_wrapper if doctype_wrapper
    end

    return result unless native_node.root

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

  return [] unless native_node.children?

  result = []
  native_node.each_child do |child|
    # Skip whitespace-only text nodes
    next if child.text? && child.content.to_s.strip.empty?

    result << patch_node(child)
  end

  # Include any EntityReference wrappers stored alongside native children
  entity_refs = native_node.instance_variable_get(:@moxml_entity_refs)
  result.concat(entity_refs) if entity_refs

  result
end

.comment_content(node) ⇒ Object 



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# File 'lib/moxml/adapter/libxml.rb', line 718

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

.create_document(_native_doc = nil) ⇒ Object 



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# File 'lib/moxml/adapter/libxml.rb', line 123

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

.create_native_cdata(content, _owner_doc = nil) ⇒ Object 



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# File 'lib/moxml/adapter/libxml.rb', line 144

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 



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# File 'lib/moxml/adapter/libxml.rb', line 149

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 



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# File 'lib/moxml/adapter/libxml.rb', line 159

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 



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# File 'lib/moxml/adapter/libxml.rb', line 165

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 



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# File 'lib/moxml/adapter/libxml.rb', line 127

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

.create_native_entity_reference(name) ⇒ Object 



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# File 'lib/moxml/adapter/libxml.rb', line 136

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

.create_native_namespace(element, prefix, uri) ⇒ Object 



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# File 'lib/moxml/adapter/libxml.rb', line 752

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 



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# File 'lib/moxml/adapter/libxml.rb', line 154

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 



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# File 'lib/moxml/adapter/libxml.rb', line 131

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 



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# File 'lib/moxml/adapter/libxml.rb', line 221

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 



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# File 'lib/moxml/adapter/libxml.rb', line 809

def doctype_external_id(native)
  native.external_id
end

.doctype_name(native) ⇒ Object

Doctype accessor methods



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# File 'lib/moxml/adapter/libxml.rb', line 804

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

.doctype_system_id(native) ⇒ Object 



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# File 'lib/moxml/adapter/libxml.rb', line 813

def doctype_system_id(native)
  native.system_id
end

.document(node) ⇒ Object 



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# File 'lib/moxml/adapter/libxml.rb', line 334

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 



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# File 'lib/moxml/adapter/libxml.rb', line 1036

def duplicate_node(node)
  return nil unless node

  # Unwrap if wrapped
  native_node = unpatch_node(node)

  # LibXML is strict about document ownership
  # Create brand new NATIVE nodes that are document-independent
  # Wrappers are only used via patch_node when reading children
  case node_type(node)
  when :doctype
    # DoctypeWrapper - create a new one with same properties
    if node.is_a?(DoctypeWrapper)
      DoctypeWrapper.new(
        create_document,
        node.name,
        node.external_id,
        node.system_id,
      )
    else
      # Should not happen, but handle gracefully
      node
    end
  when :element
    new_node = ::LibXML::XML::Node.new(native_node.name)
    # new_node.line = node.line

    # Copy and set namespace definitions FIRST
    if native_node.is_a?(::LibXML::XML::Node)
      # First, copy all namespace definitions
      native_node.namespaces.each do |ns|
        ::LibXML::XML::Namespace.new(
          new_node,
          ns.prefix,
          ns.href,
        )
      end

      # Then, set this element's own namespace if it has one
      if native_node.namespaces.namespace
        orig_ns = native_node.namespaces.namespace
        # Find the matching namespace we just created
        new_node.namespaces.each do |ns|
          if ns.prefix == orig_ns.prefix && ns.href == orig_ns.href
            new_node.namespaces.namespace = ns
            break
          end
        end
      end
    end

    # Copy attributes AFTER namespaces are set up
    # LibXML handles namespaced attributes through their full names
    if native_node.attributes?
      native_node.each_attr do |attr|
        # Get the full attribute name (may include namespace prefix)
        attr_name = if attr.ns&.prefix
                      "#{attr.ns.prefix}:#{attr.name}"
                    else
                      attr.name
                    end
        new_node[attr_name] = attr.value
      end
    end

    # Recursively copy children
    if native_node.children?
      native_node.each_child do |child|
        # Skip whitespace-only text nodes
        next if child.text? && child.content.to_s.strip.empty?

        # Recursively duplicate the child
        child_copy = duplicate_node(child)
        new_node << child_copy
      end
    end

    new_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
    # For other types, try dup as fallback
    native_node.dup
  end
end

.entity_reference_name(node) ⇒ Object 



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# File 'lib/moxml/adapter/libxml.rb', line 140

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

.get_attribute(element, name) ⇒ Object 



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# File 'lib/moxml/adapter/libxml.rb', line 414

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 



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# File 'lib/moxml/adapter/libxml.rb', line 434

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

.indent_xml(xml_string, indent_size) ⇒ Object 



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# File 'lib/moxml/adapter/libxml.rb', line 1009

def indent_xml(xml_string, indent_size)
  # Simple line-by-line indentation
  lines = []
  level = 0

  xml_string.each_line do |line|
    line = line.strip
    next if line.empty?

    # Decrease level for closing tags
    level -= 1 if line.start_with?("</")
    level = [level, 0].max

    # Add indented line
    lines << ((" " * (indent_size * level)) + line)

    # Increase level for opening tags (but not self-closing or special tags)
    next unless line.start_with?("<") && !line.start_with?("</") &&
      !line.end_with?("/>") && !line.start_with?("<?") &&
      !line.start_with?("<!") && !line.include?("</")

    level += 1
  end

  lines.join("\n")
end

.inner_text(node) ⇒ Object 



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# File 'lib/moxml/adapter/libxml.rb', line 682

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 



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# File 'lib/moxml/adapter/libxml.rb', line 775

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 



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# File 'lib/moxml/adapter/libxml.rb', line 793

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

  native_node.namespaces.map do |ns|
    ns
  end
end

.namespace_prefix(namespace) ⇒ Object 



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# File 'lib/moxml/adapter/libxml.rb', line 785

def namespace_prefix(namespace)
  namespace&.prefix
end

.namespace_uri(namespace) ⇒ Object 



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# File 'lib/moxml/adapter/libxml.rb', line 789

def namespace_uri(namespace)
  namespace&.href
end

.next_sibling(node) ⇒ Object 



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# File 'lib/moxml/adapter/libxml.rb', line 310

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

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

.node_name(node) ⇒ Object 



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# File 'lib/moxml/adapter/libxml.rb', line 211

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

.node_type(node) ⇒ Object 



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# File 'lib/moxml/adapter/libxml.rb', line 172

def node_type(node)
  return :unknown unless node

  # Handle wrapper classes
  return :element if node.is_a?(CustomizedLibxml::Element)
  return :text if node.is_a?(CustomizedLibxml::Text)
  return :cdata if node.is_a?(CustomizedLibxml::Cdata)
  return :comment if node.is_a?(CustomizedLibxml::Comment)
  if node.is_a?(CustomizedLibxml::ProcessingInstruction)
    return :processing_instruction
  end
  return :entity_reference if node.is_a?(CustomizedLibxml::EntityReference)
  return :doctype if node.is_a?(DoctypeWrapper)

  # Unwrap if needed
  native_node = unpatch_node(node)

  case native_node.node_type
  when ::LibXML::XML::Node::DOCUMENT_NODE
    :document
  when ::LibXML::XML::Node::ELEMENT_NODE
    :element
  when ::LibXML::XML::Node::TEXT_NODE
    :text
  when ::LibXML::XML::Node::CDATA_SECTION_NODE
    :cdata
  when ::LibXML::XML::Node::COMMENT_NODE
    :comment
  when ::LibXML::XML::Node::ATTRIBUTE_NODE
    :attribute
  when ::LibXML::XML::Node::PI_NODE
    :processing_instruction
  when ::LibXML::XML::Node::DTD_NODE
    :doctype
  else
    :unknown
  end
end

.parent(node) ⇒ Object 



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# File 'lib/moxml/adapter/libxml.rb', line 304

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 



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# File 'lib/moxml/adapter/libxml.rb', line 45

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

  # 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,
    )
    native_doc.instance_variable_set(:@moxml_doctype, doctype_wrapper)
  end

  ctx = _context || Context.new(:libxml)
  DocumentBuilder.new(ctx).build(native_doc)
end

.patch_node(node, _parent = nil) ⇒ Object 



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# File 'lib/moxml/adapter/libxml.rb', line 1128

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 



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# File 'lib/moxml/adapter/libxml.rb', line 1159

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 



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# File 'lib/moxml/adapter/libxml.rb', line 322

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

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

.processing_instruction_content(node) ⇒ Object 



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

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 



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# File 'lib/moxml/adapter/libxml.rb', line 728

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

.remove(node) ⇒ Object 



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# File 'lib/moxml/adapter/libxml.rb', line 597

def remove(node)
  # Handle Declaration wrapper - mark as removed on document
  if node.is_a?(CustomizedLibxml::Declaration)
    # The Declaration wrapper is stored on the actual document
    # We need to find which document it's stored on and mark it as removed
    # This is a bit tricky since the Declaration's native is its own internal doc
    # We rely on the fact that when a declaration is added to a document,
    # the document stores a reference to it in @moxml_declaration
    # So we need to clear that reference and mark it as removed

    # Since we can't easily find the parent document from the Declaration,
    # we'll set a flag on the Declaration itself
    node.instance_variable_set(:@removed, true)
    return
  end

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

.remove_attribute(element, name) ⇒ Object 



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# File 'lib/moxml/adapter/libxml.rb', line 464

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 



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# File 'lib/moxml/adapter/libxml.rb', line 617

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 



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# File 'lib/moxml/adapter/libxml.rb', line 655

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 



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# File 'lib/moxml/adapter/libxml.rb', line 345

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:



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# File 'lib/moxml/adapter/libxml.rb', line 100

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 



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# File 'lib/moxml/adapter/libxml.rb', line 847

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
      if native_node.instance_variable_defined?(:@moxml_declaration)
        decl = native_node.instance_variable_get(:@moxml_declaration)
        # Only output declaration if it exists and wasn't removed
        if decl && !decl.instance_variable_get(:@removed)
          output << decl.to_xml
        end
      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
        )
        native_node.instance_variable_set(:@moxml_declaration, decl)
        output << decl.to_xml
      end
    end

    # Add DOCTYPE if stored on document
    if native_node.instance_variable_defined?(:@moxml_doctype)
      doctype_wrapper = native_node.instance_variable_get(:@moxml_doctype)
      if doctype_wrapper
        output << "\n" unless output.empty?
        output << doctype_wrapper.to_xml
      end
    end

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

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

    if native_node.root
      # Use our custom serializer to control namespace output
      root_output = serialize_element_with_namespaces(
        native_node.root,
        true,
      )

      # Apply indentation if requested
      if options[:indent]&.positive?
        # First add newlines between elements
        formatted = add_newlines_to_xml(root_output)
        output << "\n" << indent_xml(formatted, options[:indent])
      else
        output << "\n" << root_output unless output.empty?
        output << root_output if output.empty?
      end
    end

    output
  else
    serialize_element_with_namespaces(native_node, true)
  end
end

.set_attribute(element, name, value) ⇒ Object 



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# File 'lib/moxml/adapter/libxml.rb', line 376

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 



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# File 'lib/moxml/adapter/libxml.rb', line 473

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 



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# File 'lib/moxml/adapter/libxml.rb', line 712

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 



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# File 'lib/moxml/adapter/libxml.rb', line 723

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 



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

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 



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

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 



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# File 'lib/moxml/adapter/libxml.rb', line 216

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 



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# File 'lib/moxml/adapter/libxml.rb', line 746

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 



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# File 'lib/moxml/adapter/libxml.rb', line 41

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

.set_text_content(node, content) ⇒ Object 



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# File 'lib/moxml/adapter/libxml.rb', line 694

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 



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# File 'lib/moxml/adapter/libxml.rb', line 673

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 



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# File 'lib/moxml/adapter/libxml.rb', line 1149

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 



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# File 'lib/moxml/adapter/libxml.rb', line 817

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