Class: Odin::Diff::Patcher

Inherits:
Object
  • Object
show all
Defined in:
lib/odin/diff/patcher.rb

Instance Method Summary collapse

Instance Method Details

#apply_patch(doc, diff) ⇒ Object 



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# File 'lib/odin/diff/patcher.rb', line 8

def apply_patch(doc, diff)
  return clone_document(doc) if diff.empty?

  builder = Types::OdinDocumentBuilder.new

  # Build set of paths to skip (removed + move sources)
  removed_paths = Set.new(diff.removed.map(&:path))
  moved_from_paths = Set.new(diff.moved.map(&:from_path))
  changed_paths = Set.new(diff.changed.map(&:path))
  skip_paths = removed_paths | moved_from_paths

  # 1. Copy existing assignments (except removed, moved-from, and changed)
  doc.each_assignment do |path, value|
    next if skip_paths.include?(path) || changed_paths.include?(path)

    builder.set(path, value, modifiers: doc.modifiers_for(path))
  end

  # 2. Apply changes (update values and/or modifiers)
  diff.changed.each do |change|
    builder.set(change.path, change.new_value, modifiers: change.new_modifiers)
  end

  # 3. Apply moves (add at new path)
  diff.moved.each do |move|
    mods = doc.modifiers_for(move.from_path)
    builder.set(move.to_path, move.value, modifiers: mods)
  end

  # 4. Apply additions
  diff.added.each do |entry|
    builder.set(entry.path, entry.value, modifiers: entry.modifiers)
  end

  # 5. Copy metadata
  doc.each_metadata do |key, value|
    builder.set_metadata(key, value)
  end

  builder.build
end