Module: Canon::TreeDiff::OperationConverterHelpers::UpdateChangeHandler

Defined in:
lib/canon/tree_diff/operation_converter_helpers/update_change_handler.rb

Overview

Handles UPDATE operation conversion Processes different change types (attributes, attribute_order, value, label)

Class Method Summary collapse

Class Method Details

.convert(operation, metadata, is_metadata, normative_determiner) ⇒ Array<DiffNode>

Convert UPDATE operation to DiffNode(s)

May return multiple DiffNodes if multiple dimensions changed

Parameters:

  • operation (Operation) —

    Update operation

  • metadata (Hash) —

    Enriched metadata from MetadataEnricher

  • is_metadata (Boolean) —

    Whether nodes are metadata elements

  • normative_determiner (#call) —

    Proc/object to determine normative status

Returns:

  • (Array<DiffNode>) —

    Diff nodes representing updates



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# File 'lib/canon/tree_diff/operation_converter_helpers/update_change_handler.rb', line 20

def self.convert(operation, metadata, is_metadata, normative_determiner)
  tree_node1 = operation[:node1] # TreeNode from adapter
  tree_node2 = operation[:node2] # TreeNode from adapter
  node1 = tree_node1.respond_to?(:source_node) ? tree_node1.source_node : tree_node1
  node2 = tree_node2.respond_to?(:source_node) ? tree_node2.source_node : tree_node2
  changes = operation[:changes]

  # Handle case where changes is a boolean or non-hash value
  changes = {} unless changes.is_a?(Hash)

  diff_nodes = []

  # Create separate DiffNode for each change dimension
  # This ensures each dimension can be classified independently

  if changes.key?(:attributes)
    diff_nodes << create_attribute_value_diff(
      node1, node2, changes[:attributes], metadata, is_metadata, normative_determiner
    )
  end

  if changes.key?(:attribute_order)
    diff_nodes << create_attribute_order_diff(
      node1, node2, changes[:attribute_order], metadata, is_metadata, normative_determiner
    )
  end

  if changes.key?(:value)
    diff_nodes << create_value_diff(
      node1, node2, changes[:value], metadata, is_metadata, normative_determiner, tree_node1, tree_node2
    )
  end

  if changes.key?(:label)
    diff_nodes << create_element_name_diff(
      node1, node2, changes[:label], metadata, is_metadata, normative_determiner
    )
  end

  # If no specific changes detected, create a generic update
  if diff_nodes.empty?
    diff_nodes << create_generic_update_diff(
      node1, node2, metadata, is_metadata, normative_determiner
    )
  end

  diff_nodes
end

.create_attribute_order_diff(node1, node2, changes, metadata, is_metadata, normative_determiner) ⇒ DiffNode

Create DiffNode for attribute order differences

Parameters:

  • node1 (Object) —

    First node

  • node2 (Object) —

    Second node

  • changes (Object) —

    Attribute order changes

  • metadata (Hash) —

    Enriched metadata

  • is_metadata (Boolean) —

    Whether nodes are metadata elements

  • normative_determiner (#call) —

    Proc to determine normative status

Returns:

  • (DiffNode) —

    Diff node for attribute order differences



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# File 'lib/canon/tree_diff/operation_converter_helpers/update_change_handler.rb', line 102

def self.create_attribute_order_diff(node1, node2, changes, metadata,
is_metadata, normative_determiner)
  reason = ReasonBuilder.build_attribute_order_reason(changes)

  diff_node = Canon::Diff::DiffNode.new(
    node1: node1,
    node2: node2,
    dimension: :attribute_order,
    reason: reason,
    **metadata,
  )
  diff_node.normative = is_metadata ? false : normative_determiner.call(:attribute_order)
  diff_node
end

.create_attribute_value_diff(node1, node2, changes, metadata, is_metadata, normative_determiner) ⇒ DiffNode

Create DiffNode for attribute value differences

Parameters:

  • node1 (Object) —

    First node

  • node2 (Object) —

    Second node

  • changes (Object) —

    Attribute changes

  • metadata (Hash) —

    Enriched metadata

  • is_metadata (Boolean) —

    Whether nodes are metadata elements

  • normative_determiner (#call) —

    Proc to determine normative status

Returns:

  • (DiffNode) —

    Diff node for attribute value differences



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# File 'lib/canon/tree_diff/operation_converter_helpers/update_change_handler.rb', line 78

def self.create_attribute_value_diff(node1, node2, changes, metadata,
is_metadata, normative_determiner)
  diff_details = ReasonBuilder.build_attribute_value_reason(changes)

  diff_node = Canon::Diff::DiffNode.new(
    node1: node1,
    node2: node2,
    dimension: :attribute_values,
    reason: diff_details,
    **metadata,
  )
  diff_node.normative = is_metadata ? false : normative_determiner.call(:attribute_values)
  diff_node
end

.create_element_name_diff(node1, node2, changes, metadata, is_metadata, normative_determiner) ⇒ DiffNode

Create DiffNode for element name differences

Parameters:

  • node1 (Object) —

    First node

  • node2 (Object) —

    Second node

  • changes (Object) —

    Label changes

  • metadata (Hash) —

    Enriched metadata

  • is_metadata (Boolean) —

    Whether nodes are metadata elements

  • normative_determiner (#call) —

    Proc to determine normative status

Returns:

  • (DiffNode) —

    Diff node for element name differences



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# File 'lib/canon/tree_diff/operation_converter_helpers/update_change_handler.rb', line 195

def self.create_element_name_diff(node1, node2, changes, metadata,
is_metadata, normative_determiner)
  reason = ReasonBuilder.build_element_name_reason(changes)

  diff_node = Canon::Diff::DiffNode.new(
    node1: node1,
    node2: node2,
    dimension: :element_structure,
    reason: reason,
    **metadata,
  )
  diff_node.normative = is_metadata ? false : normative_determiner.call(:element_structure)
  diff_node
end

.create_generic_update_diff(node1, node2, metadata, is_metadata, normative_determiner) ⇒ DiffNode

Create generic update DiffNode

Parameters:

  • node1 (Object) —

    First node

  • node2 (Object) —

    Second node

  • metadata (Hash) —

    Enriched metadata

  • is_metadata (Boolean) —

    Whether nodes are metadata elements

  • normative_determiner (#call) —

    Proc to determine normative status

Returns:

  • (DiffNode) —

    Generic update diff node



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# File 'lib/canon/tree_diff/operation_converter_helpers/update_change_handler.rb', line 218

def self.create_generic_update_diff(node1, node2, metadata,
is_metadata, normative_determiner)
  diff_node = Canon::Diff::DiffNode.new(
    node1: node1,
    node2: node2,
    dimension: :text_content,
    reason: "content differs",
    **metadata,
  )
  diff_node.normative = is_metadata ? false : normative_determiner.call(:text_content)
  diff_node
end

.create_text_content_diff(node1, node2, changes, metadata, is_metadata, normative_determiner) ⇒ DiffNode

Create DiffNode for text content differences

Parameters:

  • node1 (Object) —

    First node

  • node2 (Object) —

    Second node

  • changes (Object) —

    Value changes

  • metadata (Hash) —

    Enriched metadata

  • is_metadata (Boolean) —

    Whether nodes are metadata elements

  • normative_determiner (#call) —

    Proc to determine normative status

Returns:

  • (DiffNode) —

    Diff node for text content differences



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# File 'lib/canon/tree_diff/operation_converter_helpers/update_change_handler.rb', line 171

def self.create_text_content_diff(node1, node2, changes, metadata,
is_metadata, normative_determiner)
  reason = ReasonBuilder.build_text_content_reason(changes)

  diff_node = Canon::Diff::DiffNode.new(
    node1: node1,
    node2: node2,
    dimension: :text_content,
    reason: reason,
    **metadata,
  )
  diff_node.normative = is_metadata ? false : normative_determiner.call(:text_content)
  diff_node
end

.create_value_diff(node1, node2, changes, metadata, is_metadata, normative_determiner, tree_node1, tree_node2) ⇒ DiffNode

Create DiffNode for value differences (text content or comments)

Parameters:

  • node1 (Object) —

    First node

  • node2 (Object) —

    Second node

  • changes (Object) —

    Value changes

  • metadata (Hash) —

    Enriched metadata

  • is_metadata (Boolean) —

    Whether nodes are metadata elements

  • normative_determiner (#call) —

    Proc to determine normative status

  • tree_node1 (Object) —

    First tree node for label check

  • tree_node2 (Object) —

    Second tree node for label check

Returns:

  • (DiffNode) —

    Diff node for value differences



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# File 'lib/canon/tree_diff/operation_converter_helpers/update_change_handler.rb', line 128

def self.create_value_diff(node1, node2, changes, metadata,
is_metadata, normative_determiner, tree_node1, tree_node2)
  reason = ReasonBuilder.build_text_content_reason(changes)

  # Determine dimension based on node type - comments use :comments dimension
  dimension = dimension_for_value_change(tree_node1, tree_node2)

  diff_node = Canon::Diff::DiffNode.new(
    node1: node1,
    node2: node2,
    dimension: dimension,
    reason: reason,
    **metadata,
  )
  diff_node.normative = is_metadata ? false : normative_determiner.call(dimension)
  diff_node
end

.dimension_for_value_change(tree_node1, tree_node2) ⇒ Symbol

Determine dimension for value changes based on node type Comment nodes should use :comments dimension instead of :text_content

Parameters:

  • tree_node1 (Object) —

    First tree node

  • tree_node2 (Object) —

    Second tree node

Returns:

  • (Symbol) —

    The dimension to use (:text_content or :comments)



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# File 'lib/canon/tree_diff/operation_converter_helpers/update_change_handler.rb', line 152

def self.dimension_for_value_change(tree_node1, tree_node2)
  label1 = tree_node1.respond_to?(:label) ? tree_node1.label : nil
  label2 = tree_node2.respond_to?(:label) ? tree_node2.label : nil

  # If either node is a comment, use :comments dimension
  return :comments if label1 == "comment" || label2 == "comment"

  :text_content
end