Class: Lutaml::Xml::Decisions::Rules::FormatPreservationRule

Inherits:
DecisionRule
  • Object
show all
Defined in:
lib/lutaml/xml/decisions/rules/format_preservation_rule.rb

Overview

Priority 1: Preserve input format during round-trip

When parsing XML, the input format is preserved and reused during serialization to maintain format consistency

Instance Method Summary collapse

Methods inherited from DecisionRule

#<=>, #name

Instance Method Details

#applies?(context) ⇒ Boolean

Applies when input format is preserved

Returns:

  • (Boolean) 


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# File 'lib/lutaml/xml/decisions/rules/format_preservation_rule.rb', line 19

def applies?(context)
  return false unless context.has_namespace?
  return false if context.preserved_input_format.nil?

  # When a child element has its own namespace that differs from the
  # parent's, preserving the input format is critical for round-trip
  # fidelity. Using prefix format (xmlns:prefix="uri") preserves the
  # parent's default namespace scope, while switching to default format
  # (xmlns="uri") would override it, changing the namespace context for
  # the element and its descendants.
  #
  # Skip this check for root elements - they should always preserve format
  if !context.root? && context.namespace_class
    parent_ns = context.parent_namespace_class
    # If parent has no namespace but child has a namespace,
    # don't preserve format - use default format
    # Check both nil and empty URI
    parent_ns_uri = parent_ns&.uri
    if parent_ns.nil? || parent_ns_uri.nil? || parent_ns_uri.empty?
      return false
    end
  end

  true
end

#decide(context) ⇒ Object

Decision: Use the format from input



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# File 'lib/lutaml/xml/decisions/rules/format_preservation_rule.rb', line 46

def decide(context)
  input_format = context.preserved_input_format

  if input_format == :default
    Decision.default(
      namespace_class: context.namespace_class,
      reason: "Priority 1: Input used default format - preserve it",
    )
  else
    # For nested elements, use element_used_prefix which is correctly set
    # during deserialization. For root elements, use element_namespace_prefix
    # which reads from the original XmlElement.
    prefix = if context.root?
               context.element_namespace_prefix
             else
               context.element_used_prefix
             end
    Decision.prefix(
      prefix: prefix,
      namespace_class: context.namespace_class,
      reason: "Priority 1: Input used prefix format - preserve it",
    )
  end
end

#priority ⇒ Object

Priority 1



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# File 'lib/lutaml/xml/decisions/rules/format_preservation_rule.rb', line 14

def priority
  1
end