Module: Ruby::Merge

Extended by:
Merge
Includes:
Ast::Merge::SourceRegionReportSupport
Included in:
Merge
Defined in:
lib/ruby/merge.rb,
lib/ruby/merge/version.rb,
lib/ruby/merge/gemspec_support.rb,
lib/ruby/merge/nocov_node_base.rb,
lib/ruby/merge/rescue_semantics.rb,
lib/ruby/merge/method_similarity.rb,
lib/ruby/merge/signature_support.rb,
lib/ruby/merge/nocov_wrapper_base.rb,
lib/ruby/merge/doc_comment_support.rb,
lib/ruby/merge/block_binding_support.rb,
lib/ruby/merge/magic_comment_support.rb,
lib/ruby/merge/scaffold_chunk_support.rb,
lib/ruby/merge/block_directive_detector.rb,
sig/ruby/merge.rbs

Defined Under Namespace

Modules: BlockBindingSupport, DocCommentSupport, GemspecSupport, MagicCommentSupport, ScaffoldChunkSupport, SignatureSupport, Version Classes: BlockDirectiveDetector, MethodSimilarity, NocovNodeBase, NocovWrapperBase, RescueSemantics, RubyHashLiteralProjector, RubyHashNode, RubyHashPair, RubyScalarNode, TslpImportItem, TslpProcessAnalysis, TslpSpan, TslpStructureItem

Constant Summary collapse

PACKAGE_NAME = 
'ruby-merge'
TREE_SITTER_BACKEND = 
TreeHaver::KREUZBERG_LANGUAGE_PACK_BACKEND
DESTINATION_WINS_ARRAY_POLICY = 
{ surface: 'array', name: 'destination_wins_array' }.freeze
DEFAULT_METHOD_MOVE_POLICY = 
'destination_order'
BACKEND_REGISTRY = 
Struct.new(:registered, :mutex).new(false, Mutex.new)
PERCENT_ARRAY_DELIMITER_PAIRS = 
{
  '[' => ']',
  '(' => ')',
  '{' => '}',
  '<' => '>'
}.freeze
REQUIRE_PATTERN = 
/^\s*require(?:_relative)?\s+["']([^"']+)["']/
CLASS_PATTERN = 
/^\s*class\s+([A-Z]\w*(?:::\w+)*)/
MODULE_PATTERN = 
/^\s*module\s+([A-Z]\w*(?:::\w+)*)/
DEF_PATTERN = 
%r{^\s*def\s+((?:self\.)?)([a-zA-Z_]\w*[!?=]?|\[\]=?|\+@|-@|\*\*|<<|>>|<=>|===|==|=~|!~|!=|[+\-*/%&|^<>]=?|[!~`])}
CONSTANT_ASSIGNMENT_PATTERN = 
/^(\s*)([A-Z]\w*)\s*=/
CONSTANT_HASH_ASSIGNMENT_PATTERN = 
/^(\s*)([A-Z]\w*)\s*=\s*\{/
VERSION =

Current gem version exposed at the traditional constant location.

Returns:

  • (String) 
Version::VERSION

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.analyze_ruby_document(source, process_analysis: nil) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1226

def analyze_ruby_document(source, process_analysis: nil)
  lines = normalize_source(source).split("\n", -1)
  requires = ruby_analysis_require_owners(source, process_analysis)
  discovered_surfaces = []
  pending_comments = []

  lines.each_with_index do |line, index|
    line_number = index + 1
    stripped = line.strip

    if comment_line?(line)
      pending_comments << { line: line_number, raw: line }
      next
    end

    if stripped.empty?
      pending_comments = []
      next
    end

    if ruby_process_import_item_at_line(process_analysis,
                                        line_number) || legacy_require_line?(line, process_analysis)
      pending_comments = []
      next
    end

    declaration = ruby_process_structure_item_at_line(process_analysis, line_number)
    declaration ||= declaration_for_line(line) if Array(process_analysis&.structure).empty?
    if declaration
      surfaces = surfaces_for_owner(
        owner_name: declaration[:name],
        comment_entries: pending_comments
      )
      discovered_surfaces.concat(surfaces)
      pending_comments = []
      next
    end

    pending_comments = []
  end

  declaration_entries = ruby_process_owner_entries(process_analysis)
  declaration_entries = legacy_ruby_analysis_owner_entries(source) if declaration_entries.empty?
  declarations = declaration_entries.map do |entry|
    {
      path: entry[:path],
      owner_kind: 'declaration',
      match_key: entry[:name]
    }
  end

  {
    kind: 'ruby',
    dialect: 'ruby',
    root_kind: 'document',
    source: normalize_source(source),
    tree_haver_process_analysis: process_analysis,
    owners: (requires + declarations).sort_by { |owner| owner[:path] },
    discovered_surfaces: discovered_surfaces,
    method_shadowing: ruby_method_shadowing(source),
    diagnostics: ruby_method_shadowing_diagnostics(source)
  }
end

.apply_ruby_delegated_child_outputs(source, delegated_operations, apply_plan, applied_children) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1071

def apply_ruby_delegated_child_outputs(source, delegated_operations, apply_plan, applied_children)
  lines = normalize_source(source).split("\n")
  operations_by_id = delegated_operations.to_h { |operation| [operation[:operation_id], operation] }
  outputs_by_id = applied_children.to_h { |entry| [entry[:operation_id], entry[:output]] }

  replacements = apply_plan[:entries].filter_map do |entry|
    operation = operations_by_id[entry.dig(:delegated_group, :child_operation_id)]
    output = outputs_by_id[entry.dig(:delegated_group, :child_operation_id)]
    span = operation&.dig(:surface, :span)
    next if operation.nil? || output.nil? || span.nil?

    { start: span[:start_line] - 1, finish: span[:end_line] - 1, output: output }
  end

  replacements.sort_by { |entry| -entry[:start] }.each do |entry|
    prefix = comment_prefix_for(lines[entry[:start]])
    replacement_lines = if entry[:output].empty?
                          []
                        else
                          entry[:output].sub(/\n\z/, '').split("\n").map do |line|
                            "#{prefix}#{line}"
                          end
                        end
    lines[entry[:start]..entry[:finish]] = replacement_lines
  end

  {
    ok: true,
    diagnostics: [],
    output: "#{lines.join("\n").sub(/\n+\z/, '')}\n",
    policies: [DESTINATION_WINS_ARRAY_POLICY]
  }
end

.available_ruby_backends ⇒ Object 



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# File 'lib/ruby/merge.rb', line 67

def available_ruby_backends
  ruby_backend_available_for_analysis?(TREE_SITTER_BACKEND.id) ? [TREE_SITTER_BACKEND] : []
end

.collect_ruby_declaration_entries(source, process_analysis: nil) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1641

def collect_ruby_declaration_entries(source, process_analysis: nil)
  process_entries = ruby_process_declaration_entries(source, process_analysis: process_analysis)
  return process_entries unless process_entries.empty?

  legacy_collect_ruby_declaration_entries(source)
end

.match_ruby_owners(template, destination) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 158

def match_ruby_owners(template, destination)
  Ast::Merge::OwnerSelection.match_by_path(template, destination)
end

.merge_ruby(template_source, destination_source, dialect, merge_template_requires: false, method_move_policy: DEFAULT_METHOD_MOVE_POLICY) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 214

def merge_ruby(template_source, destination_source, dialect, merge_template_requires: false,
               method_move_policy: DEFAULT_METHOD_MOVE_POLICY)
  template = parse_ruby(template_source, dialect)
  return template unless template[:ok]

  method_move_policy = normalize_method_move_policy(method_move_policy)

  destination = parse_ruby(destination_source, dialect)
  unless destination[:ok]
    return {
      ok: false,
      diagnostics: destination[:diagnostics].map do |diagnostic|
        diagnostic[:category] == 'parse_error' ? diagnostic.merge(category: 'destination_parse_error') : diagnostic
      end,
      policies: []
    }
  end

  destination_context = ruby_tslp_merge_context(destination.fetch(:analysis), role: 'destination')
  return destination_context unless destination_context[:ok]

  template_context = ruby_tslp_merge_context(template.fetch(:analysis), role: 'template')
  return template_context unless template_context[:ok]

  destination_requires = destination_context.fetch(:requires)
  template_requires = template_context.fetch(:requires)
  destination_declarations = destination_context.fetch(:declarations)
  template_declarations = template_context.fetch(:declarations)
  template_declarations_by_key = template_declarations.to_h { |entry| [entry[:merge_key], entry] }
  intra_owner_merges = ruby_intra_owner_merge_plan(template_declarations, destination_declarations)
  namespace_conflicts = ruby_namespace_form_conflicts(template_declarations, destination_declarations)
  unless namespace_conflicts.empty? || TreeHaver::BackendRegistry.tag_available?(:tslp_ruby_namespace_form_equivalence)
    conflicts = namespace_conflicts.join(', ')
    return unsupported_feature_result(
      'ruby-merge cannot reconcile equivalent Ruby namespace declaration forms with the active TSLP records: ' \
      "#{conflicts}. Use prism-merge for native Ruby merging, or report missing Ruby namespace ownership " \
      'records to tree-sitter-language-pack.'
    )
  end
  if !namespace_conflicts.empty? && TreeHaver::BackendRegistry.tag_available?(:tslp_ruby_namespace_form_equivalence)
    template_declarations += qualified_nested_declaration_entries(template_declarations)
    template_declarations_by_key = template_declarations.to_h { |entry| [entry[:merge_key], entry] }
  end
  destination_paths = destination_declarations.to_h { |entry| [entry[:merge_key], true] }
  sections = []
  preamble = destination_context.fetch(:preamble)
  sections << { text: preamble } unless preamble.empty?
  requires = if merge_template_requires
               merge_ruby_requires(destination_requires,
                                   template_requires)
             else
               destination_requires
             end
  require_block = requires.map { |entry| entry[:text] }.join("\n").strip
  sections << ruby_top_level_section(require_block, requires) unless require_block.empty?
  sections.concat(
    destination_declarations.map do |entry|
      ruby_top_level_section(
        merge_ruby_declaration_entry(template_declarations_by_key[entry[:merge_key]], entry)[:text],
        [entry]
      )
    end
  )
  sections.concat(
    template_declarations.reject do |entry|
      destination_paths[entry[:merge_key]] ||
        namespace_wrapper_matched?(entry, template_declarations, destination_paths)
    end.map { |entry| { text: entry[:text] } }
  )
  destination_footer = destination_context.fetch(:footer)
  sections << { text: destination_footer } unless destination_footer.empty?

  output = emit_ruby_top_level_sections(destination_source, sections)
  matching_reports = [ruby_method_move_detection(template_source, destination_source, dialect)]
  moved_method_count = matching_reports.sum do |report|
    Array(report[:matches]).count { |entry| entry[:moved] }
  end

  {
    ok: true,
    diagnostics: [],
    output: output,
    policies: [DESTINATION_WINS_ARRAY_POLICY],
    matching_reports: matching_reports,
    merge_planning: {
      method_move_policy: method_move_policy,
      method_move_detection: {
        matching_id: 'ruby-tslp-method-move-detection',
        moved_method_count: moved_method_count,
        preserves_destination_order: method_move_policy == DEFAULT_METHOD_MOVE_POLICY,
        suppresses_duplicate_moved_methods: method_move_policy == DEFAULT_METHOD_MOVE_POLICY,
        override_scope: 'per_file_recipe'
      },
      intra_owner_merges: {
        strategy: 'destination_wins_scoped_owner_body',
        merge_count: intra_owner_merges.length,
        merges: intra_owner_merges
      }
    }
  }
end

.merge_ruby_with_nested_outputs(template_source, destination_source, dialect, nested_outputs) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1105

def merge_ruby_with_nested_outputs(template_source, destination_source, dialect, nested_outputs)
  Ast::Merge.execute_nested_merge(
    nested_outputs,
    default_family: 'ruby',
    request_id_prefix: 'nested_ruby_child',
    merge_parent: -> { merge_ruby(template_source, destination_source, dialect) },
    discover_operations: lambda { |merged_output|
      analysis = parse_ruby(merged_output, dialect)
      next { ok: false, diagnostics: analysis[:diagnostics] || [] } unless analysis[:ok]

      {
        ok: true,
        diagnostics: [],
        operations: ruby_delegated_child_operations(analysis[:analysis])
      }
    },
    apply_resolved_outputs: lambda { |merged_output, operations, apply_plan, applied_children|
      apply_ruby_delegated_child_outputs(
        merged_output,
        operations,
        apply_plan,
        applied_children
      )
    }
  )
end

.merge_ruby_with_reviewed_nested_outputs(template_source, destination_source, dialect, review_state, applied_children) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1132

def merge_ruby_with_reviewed_nested_outputs(template_source, destination_source, dialect, review_state,
                                            applied_children)
  Ast::Merge.execute_reviewed_nested_merge(
    review_state,
    'ruby',
    applied_children,
    merge_parent: -> { merge_ruby(template_source, destination_source, dialect) },
    discover_operations: lambda { |merged_output|
      analysis = parse_ruby(merged_output, dialect)
      next({ ok: false, diagnostics: analysis[:diagnostics] || [] }) unless analysis[:ok]

      {
        ok: true,
        diagnostics: [],
        operations: ruby_delegated_child_operations(analysis[:analysis])
      }
    },
    apply_resolved_outputs: lambda { |merged_output, operations, apply_plan, resolved_children|
      apply_ruby_delegated_child_outputs(
        merged_output,
        operations,
        apply_plan,
        resolved_children
      )
    }
  )
end

.merge_ruby_with_reviewed_nested_outputs_from_replay_bundle(template_source, destination_source, dialect, replay_bundle) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1160

def merge_ruby_with_reviewed_nested_outputs_from_replay_bundle(template_source, destination_source, dialect,
                                                               replay_bundle)
  execution = Array(replay_bundle[:reviewed_nested_executions]).find { |entry| entry[:family] == 'ruby' }
  unless execution
    return { ok: false,
             diagnostics: [{ severity: 'error', category: 'configuration_error', message: 'review replay bundle does not include a reviewed nested execution for ruby.' }], policies: [] }
  end

  merge_ruby_with_reviewed_nested_outputs(
    template_source,
    destination_source,
    dialect,
    execution[:review_state],
    execution[:applied_children]
  )
end

.merge_ruby_with_reviewed_nested_outputs_from_replay_bundle_envelope(template_source, destination_source, dialect, envelope) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1194

def merge_ruby_with_reviewed_nested_outputs_from_replay_bundle_envelope(template_source, destination_source,
                                                                        dialect, envelope)
  replay_bundle, import_error = Ast::Merge.import_review_replay_bundle_envelope(envelope)
  if import_error
    return { ok: false,
             diagnostics: [{ severity: 'error', category: import_error[:category], message: import_error[:message] }], policies: [] }
  end

  merge_ruby_with_reviewed_nested_outputs_from_replay_bundle(
    template_source,
    destination_source,
    dialect,
    replay_bundle
  )
end

.merge_ruby_with_reviewed_nested_outputs_from_review_state(template_source, destination_source, dialect, review_state) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1177

def merge_ruby_with_reviewed_nested_outputs_from_review_state(template_source, destination_source, dialect,
                                                              review_state)
  execution = Array(review_state[:reviewed_nested_executions]).find { |entry| entry[:family] == 'ruby' }
  unless execution
    return { ok: false,
             diagnostics: [{ severity: 'error', category: 'configuration_error', message: 'review state does not include a reviewed nested execution for ruby.' }], policies: [] }
  end

  merge_ruby_with_reviewed_nested_outputs(
    template_source,
    destination_source,
    dialect,
    execution[:review_state],
    execution[:applied_children]
  )
end

.merge_ruby_with_reviewed_nested_outputs_from_review_state_envelope(template_source, destination_source, dialect, envelope) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1210

def merge_ruby_with_reviewed_nested_outputs_from_review_state_envelope(template_source, destination_source,
                                                                       dialect, envelope)
  review_state, import_error = Ast::Merge.import_conformance_manifest_review_state_envelope(envelope)
  if import_error
    return { ok: false,
             diagnostics: [{ severity: 'error', category: import_error[:category], message: import_error[:message] }], policies: [] }
  end

  merge_ruby_with_reviewed_nested_outputs_from_review_state(
    template_source,
    destination_source,
    dialect,
    review_state
  )
end

.parse_ruby(source, dialect, backend: nil) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 118

def parse_ruby(source, dialect, backend: nil)
  requested = backend.to_s.empty? ? nil : backend.to_s
  return unsupported_feature_result("Unsupported Ruby dialect #{dialect}.") unless dialect == 'ruby'

  unless ruby_backend_available_for_analysis?(requested)
    diagnostic_backend = requested || TreeHaver.current_backend_id || 'tree-sitter'
    return unsupported_feature_result("Unsupported Ruby backend #{diagnostic_backend}.")
  end

  tree = parse_tree_sitter_source(:ruby, source, backend: requested)
  collect_parse_errors(tree.root_node)

  process_analysis = ruby_process_analysis_from_tree(source, tree.root_node)
  {
    ok: true,
    diagnostics: [],
    analysis: analyze_ruby_document(source, process_analysis: process_analysis),
    policies: []
  }
rescue TreeHaver::Error, StandardError => e
  parse_failure_result(e)
end

.ruby_backend_feature_profile(backend: nil) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 78

def ruby_backend_feature_profile(backend: nil)
  requested = requested_tree_sitter_backend_id(backend)
  unless ruby_backend_available_for_analysis?(requested)
    return unsupported_feature_result("Unsupported Ruby backend #{requested}.")
  end

  ruby_feature_profile.merge(
    backend: requested,
    backend_ref: TREE_SITTER_BACKEND.to_h,
    supports_dialects: true
  )
end

.ruby_delegated_child_operations(analysis, parent_operation_id: 'ruby-document-0') ⇒ Object 



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# File 'lib/ruby/merge.rb', line 320

def ruby_delegated_child_operations(analysis, parent_operation_id: 'ruby-document-0')
  surfaces = ruby_discovered_surfaces(analysis)
  doc_operation_ids = {}
  operations = []

  surfaces.each_with_index do |surface, index|
    next unless surface[:surface_kind] == 'ruby_doc_comment'

    operation_id = "ruby-doc-comment-#{index}"
    doc_operation_ids[surface[:address]] = operation_id
    operations << Ast::Merge.delegated_child_operation(
      operation_id: operation_id,
      parent_operation_id: parent_operation_id,
      requested_strategy: 'delegate_child_surface',
      language_chain: ['ruby', surface[:effective_language]],
      surface: surface
    )
  end

  example_index = 0
  surfaces.each do |surface|
    next unless surface[:surface_kind] == 'yard_example_block'

    operations << Ast::Merge.delegated_child_operation(
      operation_id: "yard-example-#{example_index}",
      parent_operation_id: doc_operation_ids.fetch(surface[:parent_address], parent_operation_id),
      requested_strategy: 'delegate_child_surface',
      language_chain: ['ruby', 'yard', surface[:effective_language]],
      surface: surface
    )
    example_index += 1
  end

  operations
end

.ruby_discovered_surfaces(analysis) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 316

def ruby_discovered_surfaces(analysis)
  analysis[:discovered_surfaces] || []
end

.ruby_feature_profile ⇒ Object 



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# File 'lib/ruby/merge.rb', line 59

def ruby_feature_profile
  {
    family: 'ruby',
    supported_dialects: ['ruby'],
    supported_policies: [DESTINATION_WINS_ARRAY_POLICY]
  }
end

.ruby_method_move_detection(template_source, destination_source, dialect) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 162

def ruby_method_move_detection(template_source, destination_source, dialect)
  return unsupported_feature_result("Unsupported Ruby dialect #{dialect}.") unless dialect == 'ruby'

  template_methods = ruby_method_projection(template_source, revision: 'template')
  destination_methods = ruby_method_projection(destination_source, revision: 'destination')
  destination_by_signature = destination_methods.to_h { |entry| [entry[:signature], entry] }
  template_signatures = template_methods.map { |entry| entry[:signature] }.to_h { |signature| [signature, true] }

  matches = template_methods.filter_map do |template_entry|
    destination_entry = destination_by_signature[template_entry[:signature]]
    next unless destination_entry

    moved = template_entry[:index] != destination_entry[:index] || template_entry[:parent_path] != destination_entry[:parent_path]
    Ast::Merge::MoveDetectionMatch.new(
      from_path: template_entry[:path],
      to_path: destination_entry[:path],
      from_node_id: template_entry[:node_id],
      to_node_id: destination_entry[:node_id],
      signature: template_entry[:signature],
      moved: moved,
      from_parent_path: template_entry[:parent_path],
      to_parent_path: destination_entry[:parent_path],
      from_index: template_entry[:index],
      to_index: destination_entry[:index],
      confidence: moved ? 0.98 : 0.9,
      diagnostics: [moved ? 'same Ruby method signature observed at a different sibling position' : 'same Ruby method signature observed at the same sibling position']
    )
  end

  matched_template_signatures = matches.map(&:signature).to_h { |signature| [signature, true] }
  Ast::Merge::MoveDetectionMatchingReport.new(
    matching_id: 'ruby-method-move-detection',
    strategy: 'move_detection',
    from_revision: 'template',
    to_revision: 'destination',
    capability: Ast::Merge::MoveDetectionCapability.new(
      name: 'move_detection',
      enabled: true,
      default_enabled: false,
      requires_stable_node_identity: true
    ),
    matches: matches,
    unmatched_from: template_methods.reject do |entry|
      matched_template_signatures[entry[:signature]]
    end.map { |entry| entry[:path] },
    unmatched_to: destination_methods.reject do |entry|
      template_signatures[entry[:signature]]
    end.map { |entry| entry[:path] },
    diagnostics: ['Ruby method move detection uses generic move-detection matching over receiver-aware method projections']
  ).to_h
end

.ruby_plan_context(backend: nil) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 91

def ruby_plan_context(backend: nil)
  profile = ruby_backend_feature_profile(backend: backend)
  return profile if profile[:ok] == false

  {
    family_profile: ruby_feature_profile,
    feature_profile: {
      backend: profile[:backend],
      supports_dialects: true,
      supported_policies: profile[:supported_policies]
    }
  }
end

.ruby_tslp_capability_profile ⇒ Object 



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# File 'lib/ruby/merge.rb', line 71

def ruby_tslp_capability_profile
  {
    import_records: TreeHaver::BackendRegistry.tag_available?(:tslp_ruby_import_records),
    top_level_call_records: TreeHaver::BackendRegistry.tag_available?(:tslp_ruby_top_level_call_records)
  }
end

.unsupported_feature_result(message) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 2218

def unsupported_feature_result(message)
  {
    ok: false,
    diagnostics: [{ severity: 'error', category: 'unsupported_feature', message: message }],
    policies: []
  }
end

Instance Method Details

#add_source_owner_occurrence_indexes(identities) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1925

def add_source_owner_occurrence_indexes(identities)
  counters = Hash.new(0)
  identities.map do |identity|
    occurrence_index = counters[identity[:structural_identity]]
    counters[identity[:structural_identity]] += 1
    identity.merge(
      occurrence_index: occurrence_index,
      address: occurrence_index.zero? ? identity[:address] : "#{identity[:address]}[#{occurrence_index}]"
    )
  end
end

#attached_comment_start_index(lines, declaration_index) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1852

def attached_comment_start_index(lines, declaration_index)
  index = declaration_index.to_i
  index -= 1 while index.positive? && comment_line?(lines[index - 1])
  index
end

#collect_parse_errors(node) ⇒ Object

Raises:

  • (TreeHaver::NotAvailable) 


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# File 'lib/ruby/merge.rb', line 1312

def collect_parse_errors(node)
  raise TreeHaver::NotAvailable, 'Ruby parse returned no root node' unless node
  return unless node.respond_to?(:has_error?) && node.has_error?

  raise TreeHaver::NotAvailable,
        'Ruby parse contains syntax errors'
end

#collect_ruby_preamble(source) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1290

def collect_ruby_preamble(source)
  lines = normalize_source(source).split("\n")
  preamble = []
  lines.each do |line|
    break unless line.strip.empty? || comment_line?(line)

    preamble << line.rstrip
  end
  preamble.join("\n").strip
end

#coverage_directive_comment_line?(line) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/ruby/merge.rb', line 1477

def coverage_directive_comment_line?(line)
  BlockDirectiveDetector.coverage_directive_line?(line)
end

#direct_method_shadowing(declaration_entry) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1974

def direct_method_shadowing(declaration_entry)
  grouped = direct_body_method_entries(declaration_entry[:text]).each_with_index.group_by do |(method_entry, _index)|
    method_entry[:signature]
  end

  grouped.filter_map do |signature, entries|
    next if entries.length < 2

    {
      owner_path: declaration_entry[:path],
      method_signature: signature,
      effective_index: entries.last[1],
      shadowed_indices: entries[0...-1].map { |_method_entry, index| index },
      shadowed_count: entries.length - 1
    }
  end
end

#emit_ruby_top_level_sections(destination_source, sections) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1781

def emit_ruby_top_level_sections(destination_source, sections)
  lines = normalize_source(destination_source).split("\n", -1)
  emitted = sections.reject { |section| section[:text].to_s.strip.empty? }
  previous = nil
  output = +''

  emitted.each do |section|
    output << ruby_top_level_section_separator(lines, previous, section) if previous
    output << section.fetch(:text).strip
    previous = section
  end

  "#{output.strip}\n"
end

#legacy_collect_ruby_declaration_entries(source) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1648

def legacy_collect_ruby_declaration_entries(source)
  # TSLP process records are the preferred substrate. This legacy scanner is
  # retained only for direct helper calls that do not have parser analysis.
  # Main merge paths must pass process_analysis and fail closed when TSLP
  # cannot provide readable structure records.
  lines = normalize_source(source).split("\n")
  entries = []
  pending_comments = []
  index = 0

  while index < lines.length
    line = lines[index]
    stripped = line.strip

    if comment_line?(line)
      pending_comments << index
      index += 1
      next
    end

    if stripped.empty?
      pending_comments = []
      index += 1
      next
    end

    if REQUIRE_PATTERN.match?(line)
      pending_comments = []
      index += 1
      next
    end

    declaration = declaration_for_line(line)
    unless declaration
      pending_comments = []
      index += 1
      next
    end

    start_index = pending_comments.first || index
    depth = 1
    cursor = index + 1
    while cursor < lines.length
      candidate = lines[cursor].strip
      depth += 1 if declaration_for_line(candidate)
      if candidate == 'end'
        depth -= 1
        if depth.zero?
          cursor += 1
          break
        end
      end
      cursor += 1
    end

    entries << {
      path: "/declarations/#{declaration[:name]}",
      name: declaration[:name],
      kind: declaration[:kind],
      merge_key: "#{declaration[:kind]}:#{declaration[:name]}",
      text: lines[start_index...cursor].join("\n").strip
    }
    pending_comments = []
    index = cursor
  end

  entries
end

#legacy_require_line?(line, process_analysis) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/ruby/merge.rb', line 1609

def legacy_require_line?(line, process_analysis)
  return false if process_analysis

  REQUIRE_PATTERN.match?(line)
end

#legacy_ruby_analysis_owner_entries(source) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1717

def legacy_ruby_analysis_owner_entries(source)
  normalize_source(source).split("\n").filter_map do |line|
    declaration = declaration_for_line(line)
    next unless declaration

    {
      path: "/declarations/#{declaration[:name]}",
      name: declaration[:name],
      kind: declaration[:kind],
      merge_key: "#{declaration[:kind]}:#{declaration[:name]}"
    }
  end
end

#legacy_ruby_require_owners(source) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1587

def legacy_ruby_require_owners(source)
  requires = []
  normalize_source(source).split("\n").each do |line|
    match = REQUIRE_PATTERN.match(line)
    next unless match

    requires << {
      path: "/requires/#{requires.length}",
      owner_kind: 'require',
      match_key: match[1]
    }
  end
  requires
end

#merge_array_constant_text(template_text, destination_text) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 2096

def merge_array_constant_text(template_text, destination_text)
  template_match = template_text.match(/\A(\s*[A-Z]\w*\s*=\s*)\[(.*)\]\z/)
  destination_match = destination_text.match(/\A(\s*[A-Z]\w*\s*=\s*)\[(.*)\]\z/)
  unless template_match && destination_match
    return merge_percent_array_constant_text(template_text,
                                             destination_text) || merge_multiline_array_constant_text(template_text,
                                                                                                      destination_text)
  end

  destination_elements = split_ruby_array_elements(destination_match[2])
  template_elements = split_ruby_array_elements(template_match[2])
  destination_keys = destination_elements.map do |element|
    normalize_array_element_key(element)
  end.to_h { |key| [key, true] }
  appended = template_elements.reject { |element| destination_keys[normalize_array_element_key(element)] }
  return destination_text if appended.empty?

  "#{destination_match[1]}[#{(destination_elements + appended).join(', ')}]"
end

#merge_declaration_body_constants(template_text, destination_text) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 2066

def merge_declaration_body_constants(template_text, destination_text)
  template_constants = direct_body_constant_entries(template_text)
  destination_constants = direct_body_constant_entries(destination_text)
  return destination_text if template_constants.empty?

  merged_text = merge_matched_array_constants(template_constants, destination_constants, destination_text)
  destination_names = destination_constants.map { |entry| entry[:name] }.to_h { |name| [name, true] }
  missing_constants = template_constants.reject { |entry| destination_names[entry[:name]] }
  return merged_text if missing_constants.empty?

  insert_declaration_body_blocks(merged_text, missing_constants.map do |entry|
    entry[:text]
  end, placement: :after_opening)
end

#merge_declaration_body_methods(template_text, destination_text) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 2163

def merge_declaration_body_methods(template_text, destination_text)
  template_methods = direct_body_method_entries(template_text)
  destination_methods = direct_body_method_entries(destination_text)
  return destination_text if template_methods.empty?

  destination_method_signatures = destination_methods.map do |entry|
    entry[:signature]
  end.to_h { |signature| [signature, true] }
  missing_methods = template_methods.reject { |entry| destination_method_signatures[entry[:signature]] }
  return destination_text if missing_methods.empty?

  public_methods, visibility_methods = missing_methods.partition { |entry| entry[:visibility] == 'public' }
  merged_text = destination_text
  unless public_methods.empty?
    merged_text = insert_declaration_body_blocks(
      merged_text,
      public_methods.map { |entry| entry[:body_text] },
      before_visibility: !direct_visibility_section_present?(merged_text, 'public')
    )
  end
  visibility_methods.group_by { |entry| entry[:visibility] }.each do |visibility, entries|
    blocks = if direct_visibility_section_present?(merged_text, visibility)
               merged_text = insert_declaration_body_blocks(merged_text, entries.map do |entry|
                 entry[:body_text]
               end, before_visibility: false)
               next
             else
               entries.map { |entry| entry[:text] }
             end
    merged_text = insert_declaration_body_blocks(merged_text, blocks)
  end
  merged_text
end

#merge_declaration_hash_constants(template_text, destination_text) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 2044

def merge_declaration_hash_constants(template_text, destination_text)
  template_blocks = constant_hash_blocks(template_text).to_h { |block| [block[:constant], block] }
  destination_blocks = constant_hash_blocks(destination_text)
  return destination_text if template_blocks.empty? || destination_blocks.empty?

  output = destination_text.dup
  destination_blocks.reverse_each do |destination_block|
    template_block = template_blocks[destination_block[:constant]]
    next unless template_block

    template_hash = RubyHashLiteralProjector.new(template_block[:hash_source]).call
    destination_hash = RubyHashLiteralProjector.new(destination_block[:hash_source]).call
    merged_hash = merge_ruby_hash_literals(template_hash, destination_hash)
    rendered = "#{destination_block[:prefix]}#{render_ruby_hash_literal(merged_hash,
                                                                        destination_block[:base_indent])}"
    output[destination_block[:range]] = rendered
  rescue ArgumentError
    next
  end
  output
end

#merge_matched_array_constants(template_constants, destination_constants, destination_text) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 2081

def merge_matched_array_constants(template_constants, destination_constants, destination_text)
  template_by_name = template_constants.to_h { |entry| [entry[:name], entry] }
  output = destination_text.dup
  destination_constants.reverse_each do |destination_entry|
    template_entry = template_by_name[destination_entry[:name]]
    next unless template_entry

    merged_text = merge_array_constant_text(template_entry[:text], destination_entry[:text])
    next unless merged_text

    output[destination_entry[:range]] = merged_text
  end
  output
end

#merge_multiline_array_constant_text(template_text, destination_text) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 2145

def merge_multiline_array_constant_text(template_text, destination_text)
  template_match = template_text.match(/\A(\s*[A-Z]\w*\s*=\s*\[\n)(.*)(\n\s*\])\z/m)
  destination_match = destination_text.match(/\A(\s*[A-Z]\w*\s*=\s*\[\n)(.*)(\n\s*\])\z/m)
  return unless template_match && destination_match

  destination_elements = multiline_array_elements(destination_match[2])
  template_elements = multiline_array_elements(template_match[2])
  destination_keys = destination_elements.map do |element|
    normalize_array_element_key(element[:value])
  end.to_h { |key| [key, true] }
  appended = template_elements.reject { |element| destination_keys[normalize_array_element_key(element[:value])] }
  return destination_text if appended.empty?

  insertion_prefix = destination_elements.last&.dig(:indent) || template_elements.first&.dig(:indent) || '  '
  body = append_multiline_array_elements(destination_match[2], appended, insertion_prefix)
  "#{destination_match[1]}#{body}#{destination_match[3]}"
end

#merge_nested_body_declarations(template_text, destination_text) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 2197

def merge_nested_body_declarations(template_text, destination_text)
  template_entries = direct_body_declaration_entries(template_text)
  destination_entries = direct_body_declaration_entries(destination_text)
  return destination_text if template_entries.empty? || destination_entries.empty?

  template_by_path = template_entries.to_h { |entry| [entry[:merge_key], entry] }
  output = destination_text.dup
  destination_entries.reverse_each do |destination_entry|
    template_entry = template_by_path[destination_entry[:merge_key]]
    next unless template_entry

    output[destination_entry[:range]] = merge_ruby_declaration_entry(template_entry, destination_entry)[:text]
  end

  destination_paths = destination_entries.map { |entry| entry[:merge_key] }.to_h { |path| [path, true] }
  missing_entries = template_entries.reject { |entry| destination_paths[entry[:merge_key]] }
  return output if missing_entries.empty?

  insert_declaration_body_blocks(output, missing_entries.map { |entry| entry[:text] })
end

#merge_percent_array_constant_text(template_text, destination_text) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 2116

def merge_percent_array_constant_text(template_text, destination_text)
  template_match = parse_percent_array_constant_text(template_text)
  destination_match = parse_percent_array_constant_text(destination_text)
  return unless template_match && destination_match

  destination_elements = destination_match[:body].split(/\s+/).reject(&:empty?)
  template_elements = template_match[:body].split(/\s+/).reject(&:empty?)
  destination_keys = destination_elements.to_h { |element| [element, true] }
  appended = template_elements.reject { |element| destination_keys[element] }
  return destination_text if appended.empty?

  "#{destination_match[:prefix]}#{(destination_elements + appended).join(' ')}#{destination_match[:closing]}"
end

#merge_ruby_declaration_entry(template_entry, destination_entry) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1858

def merge_ruby_declaration_entry(template_entry, destination_entry)
  return destination_entry unless template_entry

  merged_text = merge_declaration_hash_constants(template_entry[:text], destination_entry[:text])
  merged_text = merge_declaration_body_constants(template_entry[:text], merged_text)
  merged_text = merge_declaration_body_methods(template_entry[:text], merged_text)
  merged_text = merge_nested_body_declarations(template_entry[:text], merged_text)
  destination_entry.merge(
    text: merged_text
  )
end

#merge_ruby_requires(destination_requires, template_requires) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1507

def merge_ruby_requires(destination_requires, template_requires)
  destination_paths = destination_requires.to_h { |entry| [entry[:path], true] }
  destination_requires + template_requires.reject { |entry| destination_paths[entry[:path]] }
end

#namespace_wrapper_matched?(entry, candidates, matched) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/ruby/merge.rb', line 2034

def namespace_wrapper_matched?(entry, candidates, matched)
  children = candidates.select { |candidate| candidate[:namespace_root_merge_key] == entry[:merge_key] }
  return false if children.empty?
  unless direct_body_method_entries(entry[:text]).empty? && direct_body_constant_entries(entry[:text]).empty?
    return false
  end

  children.all? { |child| matched[child[:merge_key]] }
end

#normalize_declaration_text_indent(text) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 2024

def normalize_declaration_text_indent(text)
  lines = text.to_s.split("\n")
  base_indent = lines.first.to_s[/\A\s*/].to_s
  return text if base_indent.empty?

  lines.map do |line|
    line.start_with?(base_indent) ? line[base_indent.length..].to_s : line
  end.join("\n")
end

#normalize_method_move_policy(policy) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/ruby/merge.rb', line 2226

def normalize_method_move_policy(policy)
  normalized = policy.to_s.strip
  normalized = DEFAULT_METHOD_MOVE_POLICY if normalized.empty?
  return normalized if normalized == DEFAULT_METHOD_MOVE_POLICY

  raise ArgumentError, "Unsupported Ruby method move policy #{policy.inspect}"
end

#normalized_method_body_identity(body_text) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1950

def normalized_method_body_identity(body_text)
  normalized_lines = body_text.to_s.lines.map.with_index do |line, index|
    index.zero? && DEF_PATTERN.match?(line) ? "#{line[/\A\s*/]}def __owner_name__\n" : line
  end
  "sha256:#{Digest::SHA256.hexdigest(normalized_lines.join)}"
end

#parse_failure_result(error) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1320

def parse_failure_result(error)
  {
    ok: false,
    diagnostics: [{ severity: 'error', category: 'parse_error', message: error.message }],
    policies: []
  }
end

#parse_percent_array_constant_text(text) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 2130

def parse_percent_array_constant_text(text)
  match = text.match(/\A(?<head>\s*[A-Z]\w*\s*=\s*%[wWiI])(?<opening>[^\s[:alnum:]])(?<content>.*)\z/)
  return unless match

  closing = PERCENT_ARRAY_DELIMITER_PAIRS.fetch(match[:opening], match[:opening])
  content = match[:content]
  return unless content.end_with?(closing)

  {
    prefix: "#{match[:head]}#{match[:opening]}",
    body: content[0...-closing.length],
    closing: closing
  }
end

#qualified_nested_declaration_entries(entries) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 2007

def qualified_nested_declaration_entries(entries)
  entries.flat_map do |entry|
    direct_body_declaration_entries(entry[:text]).map do |nested_entry|
      root_name = entry[:name]
      nested_name = nested_entry[:name]
      qualified_name = nested_name.include?('::') ? nested_name : "#{root_name}::#{nested_name}"
      nested_entry.merge(
        name: qualified_name,
        path: "/declarations/#{qualified_name}",
        merge_key: "#{nested_entry[:kind]}:#{qualified_name}",
        text: normalize_declaration_text_indent(nested_entry[:text]),
        namespace_root_merge_key: entry[:merge_key]
      )
    end
  end
end

#register_backend! ⇒ Object 



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# File 'lib/ruby/merge.rb', line 46

def register_backend!
  BACKEND_REGISTRY.mutex.synchronize do
    return if BACKEND_REGISTRY.registered

    TreeHaver::BackendRegistry.register(TREE_SITTER_BACKEND)

    grammar_finder = TreeHaver::GrammarFinder.new(:ruby)
    grammar_finder.register! if grammar_finder.available?

    BACKEND_REGISTRY.registered = true
  end
end

#ruby_ambiguous_source_owner_identity_report(source) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 432

def ruby_ambiguous_source_owner_identity_report(source)
  identities = ruby_source_owner_identity_profile(source)
  ambiguities = identities
                .group_by { |identity| identity[:structural_identity] }
                .filter_map do |structural_identity, entries|
                  next if entries.length < 2

                  {
                    structural_identity: structural_identity,
                    occurrence_count: entries.length,
                    addresses: entries.map { |entry| entry[:address] },
                    ambiguity_kind: 'duplicate_structural_identity',
                    resolution_model: 'ordered_cursor',
                    confidence: 'structural_ordered'
                  }
                end

  {
    ambiguities: ambiguities,
    diagnostics: if ambiguities.empty?
                   []
                 else
                   [
                     {
                       severity: 'warning',
                       category: 'ambiguous_source_owner_identity',
                       message: 'Repeated Ruby source-owner identities require ordered cursor matching.'
                     }
                   ]
                 end
  }
end

#ruby_analysis_require_owners(source, process_analysis) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1570

def ruby_analysis_require_owners(source, process_analysis)
  imports = Array(process_analysis&.imports)
  unless imports.empty?
    return imports.each_with_index.map do |item, index|
      {
        path: "/requires/#{index}",
        owner_kind: 'require',
        match_key: item.source.to_s
      }
    end
  end

  return [] if process_analysis

  legacy_ruby_require_owners(source)
end

#ruby_ast_node_merge_candidate_report(surface:, base:, template:, destination:, reconstruction_risk: false) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 673

def ruby_ast_node_merge_candidate_report(surface:, base:, template:, destination:, reconstruction_risk: false)
  {
    surface: surface,
    strategy_profile: ruby_ast_node_merge_strategy_profile.fetch(:profile_id),
    candidate_strategy: reconstruction_risk ? 'fallback_or_scoped_conflict' : 'hybrid_ast_node_merge',
    owner_level_fallback_too_blunt: !reconstruction_risk,
    successor_ordering_available: true,
    pcs_like_strategy_available: true,
    public_contract_level: 'ruleset_and_fixture',
    backend_strategy_choices: ruby_ast_node_merge_strategy_profile.fetch(:backend_strategy_choices),
    inputs: {
      base: base,
      template: template,
      destination: destination
    },
    reconstruction: {
      risky: reconstruction_risk,
      outcome: reconstruction_risk ? 'fallback_or_scoped_conflict' : 'preserve_original_text_boundaries'
    },
    diagnostics: [
      {
        severity: reconstruction_risk ? 'warning' : 'info',
        category: reconstruction_risk ? 'ast_node_reconstruction_risk' : 'ast_node_merge_candidate',
        message: reconstruction_risk ? 'Ruby AST-node merge candidate has ambiguous whitespace, comment, or marker reconstruction boundaries.' : 'Ruby AST-node merge candidate can be considered when owner-level fallback would be too blunt.'
      }
    ]
  }
end

#ruby_ast_node_merge_strategy_profile ⇒ Object 



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# File 'lib/ruby/merge.rb', line 656

def ruby_ast_node_merge_strategy_profile
  {
    profile_id: 'ruby-optional-ast-node-merge',
    merge_surfaces: %w[owner ast_node line hybrid],
    optional_fine_grained_profiles: %w[expression argument_list hash_literal_pair],
    child_ordering_strategies: %w[destination_order successor_constraints pcs_like_triples],
    public_contract_level: 'ruleset_and_fixture',
    default_surface: 'owner',
    backend_strategy_choices: %w[entity_level ast_level line_level hybrid],
    reconstruction_policy: {
      preserve_original_text_unless_backend_declares_renderer: true,
      conflict_marker_placement_requires_text_boundary: true,
      risky_reconstruction_outcome: 'fallback_or_scoped_conflict'
    }
  }
end

#ruby_backend_available_for_analysis?(backend_id) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/ruby/merge.rb', line 105

def ruby_backend_available_for_analysis?(backend_id)
  register_backend!

  if backend_id.to_s.empty?
    TreeHaver.parser_for(:ruby, backend_type: :tree_sitter)
  else
    TreeHaver.with_backend(backend_id) { TreeHaver.parser_for(:ruby, backend_type: :tree_sitter) }
  end
  true
rescue TreeHaver::Error, ArgumentError
  false
end

#ruby_blank_line_ownership_report(source) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 893

def ruby_blank_line_ownership_report(source)
  regions = ruby_source_regions(source)[:regions]
  {
    blank_line_regions: source_blank_line_ownership_regions(regions: regions)
  }
end

#ruby_child_group_profile ⇒ Object 



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# File 'lib/ruby/merge.rb', line 848

def ruby_child_group_profile
  {
    profile_id: 'ruby-source-child-groups',
    groups: [
      {
        owner_kind: 'class',
        child_group: 'methods',
        ordering: 'policy_ordered',
        ordering_policy: DEFAULT_METHOD_MOVE_POLICY,
        commutative: false,
        visibility_sections: %w[public protected private]
      },
      {
        owner_kind: 'class',
        child_group: 'constants',
        ordering: 'destination_order_then_template_additions',
        commutative: false
      },
      {
        owner_kind: 'module',
        child_group: 'declarations',
        ordering: 'destination_order_then_template_additions',
        commutative: false
      }
    ],
    diagnostics: [
      {
        severity: 'info',
        category: 'ruby_child_group_profile',
        message: 'Ruby child groups preserve destination order unless an explicit policy says otherwise.'
      }
    ]
  }
end

#ruby_conflict_diagnostics_profile ⇒ Object 



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# File 'lib/ruby/merge.rb', line 575

def ruby_conflict_diagnostics_profile
  {
    profile_id: 'ruby-source-conflict-diagnostics',
    conflict_kinds: %w[
      both_modified
      both_added
      modify_delete
      rename_rename
      rename_modify
      order_sensitive_sibling_additions
      interstitial_conflict
      validation_failure
    ],
    risk_levels: %w[text_only syntax_level semantic_risk unknown],
    marker_compatibility: {
      standard_markers: true,
      enhanced_metadata: 'sidecar_or_review_state'
    },
    audit_fields: %w[
      owner_identity
      owner_kind
      strategy_chosen
      match_confidence
      fallback_reason
      validation_warnings
      conflict_kind
      conflict_scope
    ],
    stable_for_review_replay: true
  }
end

#ruby_cross_container_method_move_detection(template_source, destination_source) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1021

def ruby_cross_container_method_move_detection(template_source, destination_source)
  template_methods = ruby_method_identity_entries(template_source)
  destination_methods = ruby_method_identity_entries(destination_source)
  destination_by_signature_and_body = destination_methods.group_by do |entry|
    [entry[:signature], entry[:normalized_body_identity]]
  end

  moves = template_methods.filter_map do |template_entry|
    destination_entry = destination_by_signature_and_body.fetch(
      [template_entry[:signature], template_entry[:normalized_body_identity]],
      []
    ).find { |entry| entry[:parent_scope] != template_entry[:parent_scope] }
    next unless destination_entry

    {
      from_address: template_entry[:address],
      to_address: destination_entry[:address],
      from_parent_scope: template_entry[:parent_scope],
      to_parent_scope: destination_entry[:parent_scope],
      signature: template_entry[:signature],
      moved: true,
      move_kind: 'cross_container',
      ordering_policy: DEFAULT_METHOD_MOVE_POLICY,
      preserves_destination_order: true,
      confidence: 'content_hash'
    }
  end

  {
    capability: {
      name: 'move_detection',
      enabled: true,
      default_enabled: false,
      requires_stable_node_identity: true
    },
    moves: moves,
    diagnostics: if moves.empty?
                   []
                 else
                   [
                     {
                       severity: 'info',
                       category: 'ruby_cross_container_method_move',
                       message: 'Ruby detected same-signature method movement across containers while preserving destination order.'
                     }
                   ]
                 end
  }
end

#ruby_declaration_name_node(node) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1417

def ruby_declaration_name_node(node)
  case node.type
  when 'class', 'module'
    ruby_named_children(node).find do |child|
      %w[constant scope_resolution].include?(child.type)
    end
  when 'method'
    ruby_named_children(node).find do |child|
      %w[identifier method_identifier operator].include?(child.type)
    end
  when 'singleton_method'
    children = ruby_named_children(node)
    children.reverse.find do |child|
      %w[identifier method_identifier operator].include?(child.type)
    end
  end
end

#ruby_fallback_activation_report(reason:, scope:, selected_baseline: 'host_baseline_merge', structured_result_discarded: true) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 513

def ruby_fallback_activation_report(reason:, scope:, selected_baseline: 'host_baseline_merge',
                                    structured_result_discarded: true)
  {
    activated: true,
    reason: reason,
    scope: scope,
    selected_baseline: selected_baseline,
    structured_result_discarded: structured_result_discarded,
    policy_id: ruby_fallback_policy_profile.fetch(:policy_id),
    diagnostics: [
      {
        severity: 'warning',
        category: 'fallback_applied',
        message: "Ruby source fallback activated for #{reason} at #{scope} scope."
      }
    ]
  }
end

#ruby_fallback_policy_profile ⇒ Object 



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# File 'lib/ruby/merge.rb', line 492

def ruby_fallback_policy_profile
  {
    policy_id: 'ruby-source-fallback-policy',
    baseline_provider: {
      provider_id: 'host_baseline_merge',
      integration_point: true
    },
    scopes: %w[node subtree owned_region whole_file],
    triggers: [
      { reason: 'binary_input', scope: 'whole_file' },
      { reason: 'unsupported_structural_merge_capability', scope: 'whole_file' },
      { reason: 'no_structural_owners', scope: 'whole_file' },
      { reason: 'both_branches_create_file', scope: 'whole_file' },
      { reason: 'excessive_duplicate_identities', scope: 'owned_region' },
      { reason: 'timeout_or_resource_budget', scope: 'whole_file' },
      { reason: 'backend_diagnostic_threshold', scope: 'owned_region' }
    ],
    reporting_fields: %w[activated reason scope selected_baseline structured_result_discarded]
  }
end

#ruby_fallback_scope_guard_report(requested_scope:, declared_scope:) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 807

def ruby_fallback_scope_guard_report(requested_scope:, declared_scope:)
  widened = ruby_fallback_scope_rank(requested_scope) > ruby_fallback_scope_rank(declared_scope)
  {
    requested_scope: requested_scope,
    declared_scope: declared_scope,
    widened: widened,
    activated: !widened,
    diagnostics: [
      {
        severity: widened ? 'error' : 'info',
        category: widened ? 'fallback_scope_widening_rejected' : 'fallback_scope_accepted',
        message: widened ? "Ruby fallback cannot widen from #{declared_scope} to #{requested_scope} without an explicit policy." : 'Ruby fallback scope is within the declared policy.'
      }
    ]
  }
end

#ruby_fallback_scope_rank(scope) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1485

def ruby_fallback_scope_rank(scope)
  ruby_fallback_policy_profile.fetch(:scopes).index(scope.to_s) || Float::INFINITY
end

#ruby_file_footer_text(source) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1301

def ruby_file_footer_text(source)
  regions = ruby_source_regions(source).fetch(:regions)
  footer = regions.reverse.find do |region|
    region[:region_kind] == 'interstitial' && region[:position] == 'file_footer'
  end
  content = footer.to_h.fetch(:content, '').strip
  return '' if content.empty?

  content.lines.any? { |line| !line.strip.empty? && !comment_line?(line) } ? '' : content
end

#ruby_first_descendant(node, &block) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1435

def ruby_first_descendant(node, &block)
  ruby_named_children(node).each do |child|
    return child if yield(child)

    descendant = ruby_first_descendant(child, &block)
    return descendant if descendant
  end
  nil
end

#ruby_formatter_adapter_report(pre_format_output:, formatted_output:, policy: 'validate_only', conflict_scope: 'none') ⇒ Object 



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# File 'lib/ruby/merge.rb', line 626

def ruby_formatter_adapter_report(pre_format_output:, formatted_output:, policy: 'validate_only',
                                  conflict_scope: 'none')
  pre_format_owners = ruby_source_owner_identity_profile(pre_format_output)
  formatted_owners = ruby_source_owner_identity_profile(formatted_output)
  formatted_owner_signatures = stable_owner_signatures(formatted_owners)
  owners_preserved = stable_owner_signatures(pre_format_owners) == formatted_owner_signatures
  whitespace_repaired = pre_format_output != formatted_output

  {
    policy: policy,
    formatter_profile: ruby_formatter_policy_profile.fetch(:profile_id),
    adapter_phase: 'optional_post_merge_adapter',
    semantic_validation: 'not_proven_by_formatter',
    whitespace_repaired: whitespace_repaired,
    owners_preserved: owners_preserved,
    conflict_scope_preserved: true,
    validation_semantics_preserved: true,
    conflict_scope: conflict_scope,
    portable_expectation: 'formatter_not_executed_unless_fixture_opts_in',
    owner_signatures: formatted_owner_signatures,
    diagnostics: [
      {
        severity: owners_preserved ? 'info' : 'error',
        category: owners_preserved ? 'formatter_adapter_accepted' : 'formatter_adapter_rejected',
        message: owners_preserved ? 'Ruby formatter adapter preserved owner identity, conflict scope, and validation semantics.' : 'Ruby formatter adapter changed owner identity and cannot be accepted as a semantic merge.'
      }
    ]
  }
end

#ruby_formatter_policy_profile ⇒ Object 



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# File 'lib/ruby/merge.rb', line 607

def ruby_formatter_policy_profile
  {
    profile_id: 'ruby-source-formatter-policy',
    adapter_phase: 'optional_post_merge_adapter',
    semantic_validation: 'not_proven_by_formatter',
    policies: %w[
      no_formatter
      validate_only
      format_after_clean_merge
      format_after_fallback
      formatter_failure_is_warning
      formatter_failure_is_hard_error
    ],
    portable_fixture_default: 'no_formatter',
    formatter_execution_in_portable_expectations: 'only_when_fixture_opts_in',
    invariants: %w[owner_identity conflict_scope validation_semantics]
  }
end

#ruby_import_item_from_begin_node(source, node) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1378

def ruby_import_item_from_begin_node(source, node)
  children = ruby_named_children(node)
  call_imports = children.filter_map do |child|
    ruby_import_item_from_node(source, child) if child.type == 'call'
  end
  return if call_imports.empty?

  unsupported = children.any? do |child|
    child.type != 'call' && !ruby_load_error_rescue_node?(source, child)
  end
  return if unsupported

  TslpImportItem.new(source: call_imports.map(&:source).join(','), span: ruby_span_for(node))
end

#ruby_import_item_from_modifier_node(source, node) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1368

def ruby_import_item_from_modifier_node(source, node)
  call_node = ruby_named_children(node).first
  return unless call_node&.type == 'call'

  import = ruby_import_item_from_node(source, call_node)
  return unless import

  TslpImportItem.new(source: import.source, span: ruby_import_span_for(source, node))
end

#ruby_import_item_from_node(source, node) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1352

def ruby_import_item_from_node(source, node)
  children = ruby_named_children(node)
  callee = children.first
  return unless callee && %w[identifier method_identifier].include?(callee.type)

  name = ruby_node_text(source, callee)
  return unless %w[require require_relative].include?(name)

  string_node = ruby_first_descendant(node) do |child|
    %w[string_content simple_symbol].include?(child.type)
  end
  return unless string_node

  TslpImportItem.new(source: ruby_node_text(source, string_node), span: ruby_import_span_for(source, node))
end

#ruby_import_span_for(source, node) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1460

def ruby_import_span_for(source, node)
  span = ruby_span_for(node)
  lines = normalize_source(source).split("\n")
  start_row = span.start_row
  end_row = span.end_row

  start_row -= 1 while start_row.positive? && coverage_directive_comment_line?(lines[start_row - 1])
  end_row += 1 while end_row < lines.length - 1 && coverage_directive_comment_line?(lines[end_row + 1])

  TslpSpan.new(
    start_row: start_row,
    start_col: start_row == span.start_row ? span.start_col : 0,
    end_row: end_row,
    end_col: end_row == span.end_row ? span.end_col : lines[end_row].to_s.length
  )
end

#ruby_interstitial_comment_attachment_report(source) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 883

def ruby_interstitial_comment_attachment_report(source)
  lines = normalize_source(source).lines(chomp: true)
  owners = top_level_source_region_owners(lines)
  source_comment_block_attachment_report(
    lines: lines,
    owners: owners,
    comment_line: method(:comment_line?)
  )
end

#ruby_interstitial_merge_policy_profile ⇒ Object 



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# File 'lib/ruby/merge.rb', line 824

def ruby_interstitial_merge_policy_profile
  {
    policy_id: 'ruby-source-interstitial-merge',
    separates_owner_merge: true,
    region_kinds: %w[file_header file_footer container_header container_footer between],
    owner_adjacency_fields: %w[previous_owner next_owner],
    rules: [
      {
        region_kind: 'require',
        ordering: 'destination_order_then_template_additions',
        duplicate_key: 'require_path'
      },
      {
        region_kind: 'blank_line',
        ownership: 'preserve_declared_region_owner'
      },
      {
        region_kind: 'comment',
        attachment: 'nearest_declared_owner_or_standalone'
      }
    ]
  }
end

#ruby_intra_owner_merge_plan(template_entries, destination_entries) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1870

def ruby_intra_owner_merge_plan(template_entries, destination_entries)
  template_by_key = template_entries.to_h { |entry| [entry[:merge_key], entry] }
  destination_entries.flat_map do |destination_entry|
    template_entry = template_by_key[destination_entry[:merge_key]]
    next [] unless template_entry
    next [] unless %w[class module].include?(destination_entry[:kind])

    template_methods = direct_body_method_entries(template_entry[:text]).to_h { |entry| [entry[:signature], entry] }
    direct_body_method_entries(destination_entry[:text]).filter_map do |destination_method|
      template_method = template_methods[destination_method[:signature]]
      next unless template_method
      next if template_method[:body_text] == destination_method[:body_text]

      {
        owner_path: destination_entry[:path],
        owner_kind: destination_entry[:kind],
        owner_name: destination_entry[:name],
        child_group: 'methods',
        child_signature: destination_method[:signature],
        child_path: "#{destination_entry[:path]}/methods/#{destination_method[:signature]}",
        decision: 'destination_wins',
        scope: 'owner_body'
      }
    end
  end
end

#ruby_load_error_rescue_node?(source, node) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/ruby/merge.rb', line 1393

def ruby_load_error_rescue_node?(source, node)
  return false unless node.type == 'rescue'
  return false unless ruby_named_children(node).all? { |child| child.type == 'exceptions' }

  ruby_node_text(source, node).match?(/\Arescue\s+LoadError\b/)
end

#ruby_method_identity_entries(source) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1937

def ruby_method_identity_entries(source)
  collect_ruby_declaration_entries(source).flat_map do |declaration_entry|
    direct_body_method_entries(declaration_entry[:text]).map do |method_entry|
      {
        parent_scope: declaration_entry[:path],
        signature: method_entry[:signature],
        address: "#{declaration_entry[:path]}/methods/#{method_entry[:signature]}",
        normalized_body_identity: normalized_method_body_identity(method_entry[:body_text])
      }
    end
  end
end

#ruby_method_projection(source, revision:) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1992

def ruby_method_projection(source, revision:)
  collect_ruby_declaration_entries(source).flat_map do |declaration_entry|
    direct_body_method_entries(declaration_entry[:text]).each_with_index.map do |method_entry, index|
      signature = "method:#{declaration_entry[:path]}:#{method_entry[:signature]}"
      {
        path: "#{declaration_entry[:path]}/methods/#{index}",
        parent_path: "#{declaration_entry[:path]}/methods",
        node_id: "#{revision}:#{signature}",
        signature: signature,
        index: index
      }
    end
  end
end

#ruby_method_shadowing(source) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1957

def ruby_method_shadowing(source)
  collect_ruby_declaration_entries(source).flat_map do |entry|
    direct_method_shadowing(entry)
  end
end

#ruby_method_shadowing_diagnostics(source) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1963

def ruby_method_shadowing_diagnostics(source)
  ruby_method_shadowing(source).map do |entry|
    {
      severity: 'warning',
      category: 'ruby_method_shadowing',
      path: "#{entry[:owner_path]}/methods/#{entry[:method_signature]}",
      message: "Ruby method #{entry[:method_signature]} is defined #{entry[:shadowed_count] + 1} times in #{entry[:owner_path]}; the last definition shadows earlier definitions."
    }
  end
end

#ruby_named_children(node) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1445

def ruby_named_children(node)
  node.children.select { |child| !child.respond_to?(:named?) || child.named? }
end

#ruby_namespace_form_conflicts(template_entries, destination_entries) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1897

def ruby_namespace_form_conflicts(template_entries, destination_entries)
  destination_names = destination_entries.to_h do |entry|
    ["#{entry[:kind]}:#{entry[:name]}", true]
  end
  template_entries.flat_map do |entry|
    direct_body_declaration_entries(entry[:text]).filter_map do |nested_entry|
      compact_key = "#{nested_entry[:kind]}:#{entry[:name]}::#{nested_entry[:name]}"
      next unless destination_names[compact_key]

      "#{entry[:name]}::#{nested_entry[:name]}"
    end
  end.uniq
end

#ruby_never_worse_fallback_mode ⇒ Object 



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# File 'lib/ruby/merge.rb', line 532

def ruby_never_worse_fallback_mode
  {
    mode_id: 'never_worse_than_baseline',
    enabled: true,
    baseline_provider: ruby_fallback_policy_profile.dig(:baseline_provider, :provider_id),
    comparison: {
      conflict_count: 'structured_must_not_exceed_baseline',
      conflict_scope: 'structured_must_not_be_broader_than_baseline',
      data_loss: 'structured_must_not_drop_clean_branch_content'
    },
    fallback_action: 'discard_structured_result_and_use_baseline',
    diagnostics: [
      {
        severity: 'info',
        category: 'never_worse_fallback_mode',
        message: 'Ruby fallback comparison mode treats the host baseline merge as the safety floor.'
      }
    ]
  }
end

#ruby_node_text(source, node) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1481

def ruby_node_text(source, node)
  source[node.start_byte...node.end_byte].to_s
end

#ruby_post_merge_validation_profile ⇒ Object 



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# File 'lib/ruby/merge.rb', line 553

def ruby_post_merge_validation_profile
  {
    profile_id: 'ruby-post-merge-validation',
    phase: 'post_merge_validation',
    separate_from: %w[merge_planning rendering],
    checks: %w[
      reparse_merged_output
      resolved_owners_present
      owner_count_not_unexpectedly_lower
      unchanged_significant_lines_preserved
      branch_added_significant_lines_preserved
      output_length_within_policy_bounds
      conflict_marker_shape_compatible
    ],
    failure_outcomes: %w[fallback_to_baseline scoped_conflict hard_diagnostic_failure],
    hooks: {
      ci: 'strict',
      exploratory: 'permissive_when_explicit'
    }
  }
end

#ruby_process_analysis_from_tree(source, root_node) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1328

def ruby_process_analysis_from_tree(source, root_node)
  structure = []
  imports = []

  ruby_named_children(root_node).each do |node|
    case node.type
    when 'call'
      import = ruby_import_item_from_node(source, node)
      imports << import if import
    when 'if_modifier'
      import = ruby_import_item_from_modifier_node(source, node)
      imports << import if import
    when 'begin'
      import = ruby_import_item_from_begin_node(source, node)
      imports << import if import
    when 'class', 'module', 'method', 'singleton_method'
      item = ruby_structure_item_from_node(source, node)
      structure << item if item
    end
  end

  TslpProcessAnalysis.new(structure: structure, imports: imports)
end

#ruby_process_declaration_entries(source, process_analysis: nil) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1746

def ruby_process_declaration_entries(source, process_analysis: nil)
  items = ruby_top_level_process_structure_items(process_analysis)
  return [] if items.empty?

  lines = normalize_source(source).split("\n")
  items.map do |item|
    start_index = attached_comment_start_index(lines, item.span.start_row)
    finish_index = item.span.end_row
    kind = ruby_process_structure_kind(item)
    name = item.name.to_s
    {
      path: "/declarations/#{name}",
      name: name,
      kind: kind,
      merge_key: "#{kind}:#{name}",
      text: lines[start_index..finish_index].to_a.join("\n").strip,
      start_index: start_index,
      end_index: finish_index
    }
  end
end

#ruby_process_import_entries(source, process_analysis) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1557

def ruby_process_import_entries(source, process_analysis)
  lines = normalize_source(source).split("\n")
  Array(process_analysis&.imports).map do |item|
    text = lines[item.span.start_row..item.span.end_row].to_a.join("\n").rstrip
    {
      path: "/requires/#{item.source}",
      text: text,
      start_index: item.span.start_row,
      end_index: item.span.end_row
    }
  end
end

#ruby_process_import_item_at_line(process_analysis, line_number) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1602

def ruby_process_import_item_at_line(process_analysis, line_number)
  index = line_number.to_i - 1
  Array(process_analysis&.imports).find do |item|
    item.span.start_row <= index && item.span.end_row >= index
  end
end

#ruby_process_owner_entries(process_analysis) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1731

def ruby_process_owner_entries(process_analysis)
  Array(process_analysis&.structure).filter_map do |item|
    kind = ruby_process_owner_kind(item)
    name = item.name.to_s
    next if kind.to_s.empty? || name.empty?

    {
      path: "/declarations/#{name}",
      name: name,
      kind: kind,
      merge_key: "#{kind}:#{name}"
    }
  end
end

#ruby_process_owner_kind(item) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1830

def ruby_process_owner_kind(item)
  case item.kind.to_s
  when 'class'
    'class'
  when 'module'
    'module'
  when 'method', 'function'
    'def'
  end
end

#ruby_process_structure_item_at_line(process_analysis, line_number) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1821

def ruby_process_structure_item_at_line(process_analysis, line_number)
  Array(process_analysis&.structure).find do |item|
    ruby_process_owner_kind(item) &&
      item.span.start_row == line_number - 1
  end&.then do |item|
    { kind: ruby_process_owner_kind(item), name: item.name.to_s }
  end
end

#ruby_process_structure_kind(item) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1841

def ruby_process_structure_kind(item)
  case item.kind.to_s
  when 'class'
    'class'
  when 'module'
    'module'
  when 'method', 'function'
    'def'
  end
end

#ruby_rename_detection(template_source, destination_source) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 916

def ruby_rename_detection(template_source, destination_source)
  template_methods = ruby_method_identity_entries(template_source)
  destination_methods = ruby_method_identity_entries(destination_source)
  destination_by_parent_and_body = destination_methods.group_by do |entry|
    [entry[:parent_scope], entry[:normalized_body_identity]]
  end
  destination_signature_keys = destination_methods.to_h do |entry|
    [[entry[:parent_scope], entry[:signature]], true]
  end
  matched_destination_addresses = {}

  renames = template_methods.filter_map do |template_entry|
    next if destination_signature_keys[[template_entry[:parent_scope], template_entry[:signature]]]

    destination_entry = destination_by_parent_and_body.fetch(
      [template_entry[:parent_scope], template_entry[:normalized_body_identity]],
      []
    ).find { |entry| entry[:signature] != template_entry[:signature] }
    next unless destination_entry

    matched_destination_addresses[destination_entry[:address]] = true
    {
      from_address: template_entry[:address],
      to_address: destination_entry[:address],
      from_name: template_entry[:signature],
      to_name: destination_entry[:signature],
      parent_scope: template_entry[:parent_scope],
      confidence: 'content_hash',
      signals: %w[body_hash_with_owner_name_normalization parent_scope_similarity],
      clean_rename: true
    }
  end

  {
    policy: ruby_rename_detection_policy_profile,
    renames: renames,
    diagnostics: if renames.empty?
                   []
                 else
                   [
                     {
                       severity: 'info',
                       category: 'ruby_rename_detection',
                       message: 'Ruby rename detection is explicit and reports clean same-parent method renames by normalized body hash.'
                     }
                   ]
                 end,
    unmatched_destination: destination_methods.reject do |entry|
      matched_destination_addresses[entry[:address]]
    end.map { |entry| entry[:address] }
  }
end

#ruby_rename_detection_policy_profile ⇒ Object 



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# File 'lib/ruby/merge.rb', line 900

def ruby_rename_detection_policy_profile
  {
    policy_id: 'ruby-source-rename-detection',
    capability: {
      name: 'rename_detection',
      enabled: true,
      default_enabled: false,
      explicit: true
    },
    signals: %w[body_hash_with_owner_name_normalization structural_hash token_similarity parent_scope_similarity
                backend_native_move_metadata],
    clean_rename_confidence: 'content_hash',
    conflict_policy: 'report_rename_plus_edit'
  }
end

#ruby_rename_plus_edit_conflicts(base_source, template_source, destination_source) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 969

def ruby_rename_plus_edit_conflicts(base_source, template_source, destination_source)
  base_methods = ruby_method_identity_entries(base_source)
  template_methods = ruby_method_identity_entries(template_source)
  destination_methods = ruby_method_identity_entries(destination_source)
  template_by_parent = template_methods.group_by { |entry| entry[:parent_scope] }
  destination_by_parent = destination_methods.group_by { |entry| entry[:parent_scope] }

  conflicts = base_methods.filter_map do |base_entry|
    template_candidates = template_by_parent.fetch(base_entry[:parent_scope], []).reject do |entry|
      entry[:signature] == base_entry[:signature]
    end
    destination_candidates = destination_by_parent.fetch(base_entry[:parent_scope], []).reject do |entry|
      entry[:signature] == base_entry[:signature]
    end
    next if template_candidates.empty? || destination_candidates.empty?

    template_candidate = template_candidates.first
    destination_candidate = destination_candidates.first
    next if template_candidate[:signature] == destination_candidate[:signature]

    {
      base_address: base_entry[:address],
      template_address: template_candidate[:address],
      destination_address: destination_candidate[:address],
      parent_scope: base_entry[:parent_scope],
      conflict_kind: 'rename_plus_edit',
      fallback_scope: 'owned_region',
      confidence: 'unresolved',
      diagnostics: [
        'both branches renamed the same Ruby owner differently',
        'method body identity changed on at least one side'
      ]
    }
  end

  {
    policy: ruby_rename_detection_policy_profile,
    conflicts: conflicts,
    diagnostics: if conflicts.empty?
                   []
                 else
                   [
                     {
                       severity: 'warning',
                       category: 'ruby_rename_plus_edit_conflict',
                       message: 'Ruby rename detection found incompatible rename-plus-edit changes.'
                     }
                   ]
                 end
  }
end

#ruby_silent_data_loss_validation_report(template_source:, destination_source:, output:) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 772

def ruby_silent_data_loss_validation_report(template_source:, destination_source:, output:)
  significant_inputs = {
    template: significant_source_lines(template_source),
    destination: significant_source_lines(destination_source)
  }
  output_lines = significant_source_lines(output).to_h { |line| [line, true] }
  missing = significant_inputs.flat_map do |side, lines|
    lines.reject { |line| output_lines[line] }.map do |line|
      {
        side: side.to_s,
        line: line,
        check: 'branch_added_significant_lines_preserved'
      }
    end
  end

  {
    ok: missing.empty?,
    validation_profile: ruby_post_merge_validation_profile.fetch(:profile_id),
    failures: missing,
    outcome: missing.empty? ? 'accepted' : 'hard_diagnostic_failure',
    diagnostics: if missing.empty?
                   []
                 else
                   [
                     {
                       severity: 'error',
                       category: 'silent_data_loss_prevention',
                       message: 'Ruby post-merge validation detected significant input lines missing from output.'
                     }
                   ]
                 end
  }
end

#ruby_source_owner_identity_matches(template_source, destination_source) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 389

def ruby_source_owner_identity_matches(template_source, destination_source)
  template_identities = ruby_source_owner_identity_profile(template_source)
  destination_identities = ruby_source_owner_identity_profile(destination_source)
  destination_groups = destination_identities.group_by { |identity| identity[:structural_identity] }
  template_identities.group_by { |identity| identity[:structural_identity] }
  matched_destination_addresses = {}

  matches = template_identities.filter_map do |template_identity|
    destination_identity = destination_groups.fetch(template_identity[:structural_identity], []).find do |candidate|
      candidate[:occurrence_index] == template_identity[:occurrence_index]
    end
    next unless destination_identity

    matched_destination_addresses[destination_identity[:address]] = true
    {
      template_address: template_identity[:address],
      destination_address: destination_identity[:address],
      structural_identity: template_identity[:structural_identity],
      occurrence_index: template_identity[:occurrence_index],
      confidence: 'structural_ordered'
    }
  end

  matched_template_addresses = matches.to_h { |match| [match[:template_address], true] }
  {
    confidence_profile: ruby_source_owner_match_confidence_profile,
    matches: matches,
    unmatched_template: template_identities.reject do |identity|
      matched_template_addresses[identity[:address]]
    end.map { |identity| identity[:address] },
    unmatched_destination: destination_identities.reject do |identity|
      matched_destination_addresses[identity[:address]]
    end.map { |identity| identity[:address] },
    diagnostics: [
      {
        severity: 'info',
        category: 'source_owner_identity_matching',
        message: 'Ruby source-owner matching reports confidence per match and uses ordered structural pairing for duplicate identities.'
      }
    ]
  }
end

#ruby_source_owner_identity_profile(source) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 366

def ruby_source_owner_identity_profile(source)
  identities = collect_ruby_declaration_entries(source).flat_map do |entry|
    declaration_identity = source_owner_identity_entry(
      kind: entry[:kind],
      name: entry[:name],
      parent_scope: '/',
      address: entry[:path],
      content: entry[:text]
    )
    method_identities = direct_body_method_entries(entry[:text]).map do |method_entry|
      source_owner_identity_entry(
        kind: 'method',
        name: method_entry[:signature],
        parent_scope: entry[:path],
        address: "#{entry[:path]}/methods/#{method_entry[:signature]}",
        content: method_entry[:body_text]
      )
    end
    [declaration_identity, *method_identities]
  end
  add_source_owner_occurrence_indexes(identities)
end

#ruby_source_owner_match_confidence_profile ⇒ Object 



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# File 'lib/ruby/merge.rb', line 465

def ruby_source_owner_match_confidence_profile
  {
    levels: [
      {
        name: 'exact',
        meaning: 'same structural identity, occurrence index, and content identity'
      },
      {
        name: 'structural_ordered',
        meaning: 'same structural identity and occurrence index'
      },
      {
        name: 'content_hash',
        meaning: 'same content-derived identity when structural identity is ambiguous'
      },
      {
        name: 'token_similar',
        meaning: 'similar token content below exact content identity'
      },
      {
        name: 'unresolved',
        meaning: 'identity is ambiguous and must not be auto-matched'
      }
    ]
  }
end

#ruby_source_regions(source) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 356

def ruby_source_regions(source)
  lines = normalize_source(source).lines(chomp: true)
  owners = top_level_source_region_owners(lines)

  {
    regions: source_interleaved_regions_for_report(lines: lines, owners: owners),
    trailing_newline: normalize_source(source).end_with?("\n")
  }
end

#ruby_span_for(node) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1449

def ruby_span_for(node)
  start_point = node.start_point
  end_point = node.end_point
  TslpSpan.new(
    start_row: start_point.fetch(:row),
    start_col: start_point.fetch(:column),
    end_row: end_point.fetch(:row),
    end_col: end_point.fetch(:column)
  )
end

#ruby_structure_item_from_node(source, node) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1400

def ruby_structure_item_from_node(source, node)
  kind = case node.type
         when 'class'
           'class'
         when 'module'
           'module'
         when 'method', 'singleton_method'
           'method'
         end
  return unless kind

  name_node = ruby_declaration_name_node(node)
  return unless name_node

  TslpStructureItem.new(kind: kind, name: ruby_node_text(source, name_node), span: ruby_span_for(node))
end

#ruby_top_level_process_structure_items(process_analysis) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1806

def ruby_top_level_process_structure_items(process_analysis)
  items = Array(process_analysis&.structure).select do |item|
    ruby_process_structure_kind(item) && !item.name.to_s.empty?
  end
  items.reject do |item|
    items.any? do |candidate|
      next false if candidate.equal?(item)

      candidate.span.start_row <= item.span.start_row &&
        candidate.span.end_row >= item.span.end_row &&
        (candidate.span.start_row < item.span.start_row || candidate.span.end_row > item.span.end_row)
    end
  end.sort_by { |item| [item.span.start_row, item.span.start_col] }
end

#ruby_top_level_section(text, entries) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1768

def ruby_top_level_section(text, entries)
  positioned_entries = entries.select do |entry|
    entry[:start_index].is_a?(Integer) && entry[:end_index].is_a?(Integer)
  end
  return { text: text } if positioned_entries.empty?

  {
    text: text,
    start_index: positioned_entries.map { |entry| entry[:start_index] }.min,
    end_index: positioned_entries.map { |entry| entry[:end_index] }.max
  }
end

#ruby_top_level_section_separator(lines, previous, current) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1796

def ruby_top_level_section_separator(lines, previous, current)
  return "\n\n" unless previous[:end_index].is_a?(Integer) && current[:start_index].is_a?(Integer)
  return "\n\n" unless current[:start_index] > previous[:end_index]

  gap = lines[(previous[:end_index] + 1)...current[:start_index]].to_a
  return "\n\n" if gap.empty?

  "\n#{gap.join("\n")}\n"
end

#ruby_tslp_claimed_line_indexes(lines, process_analysis) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1545

def ruby_tslp_claimed_line_indexes(lines, process_analysis)
  claimed = Set.new
  ruby_top_level_process_structure_items(process_analysis).each do |item|
    start_index = attached_comment_start_index(lines, item.span.start_row)
    (start_index..item.span.end_row).each { |line_index| claimed.add(line_index) }
  end
  Array(process_analysis&.imports).each do |item|
    (item.span.start_row..item.span.end_row).each { |line_index| claimed.add(line_index) }
  end
  claimed
end

#ruby_tslp_file_footer_text(source, process_analysis) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1615

def ruby_tslp_file_footer_text(source, process_analysis)
  lines = normalize_source(source).split("\n")
  claimed = ruby_tslp_claimed_line_indexes(lines, process_analysis)
  footer_indexes = []
  (lines.length - 1).downto(0) do |index|
    break if claimed.include?(index)
    break unless lines[index].strip.empty? || comment_line?(lines[index])

    footer_indexes.unshift(index)
  end
  lines.values_at(*footer_indexes).join("\n").strip
end

#ruby_tslp_file_preamble_text(source, process_analysis) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1628

def ruby_tslp_file_preamble_text(source, process_analysis)
  lines = normalize_source(source).split("\n")
  claimed = ruby_tslp_claimed_line_indexes(lines, process_analysis)
  preamble_indexes = []
  lines.each_index do |index|
    break if claimed.include?(index)
    break unless lines[index].strip.empty? || comment_line?(lines[index])

    preamble_indexes << index
  end
  lines.values_at(*preamble_indexes).join("\n").strip
end

#ruby_tslp_merge_context(analysis, role:) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1512

def ruby_tslp_merge_context(analysis, role:)
  source = analysis.fetch(:source)
  process_analysis = analysis[:tree_haver_process_analysis]
  unsupported_lines = ruby_tslp_unsupported_top_level_lines(source, process_analysis)
  unless unsupported_lines.empty?
    return unsupported_feature_result(
      "ruby-merge can only merge TSLP-record-backed top-level Ruby declarations and imports; #{role} has unsupported top-level content on line(s) #{unsupported_lines.join(', ')}. Use prism-merge for native Ruby merging, or report missing Ruby process records to tree-sitter-language-pack."
    )
  end

  {
    ok: true,
    source: source,
    preamble: ruby_tslp_file_preamble_text(source, process_analysis),
    requires: ruby_process_import_entries(source, process_analysis),
    declarations: collect_ruby_declaration_entries(source, process_analysis: process_analysis),
    footer: ruby_tslp_file_footer_text(source, process_analysis)
  }
end

#ruby_tslp_unsupported_top_level_lines(source, process_analysis) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1532

def ruby_tslp_unsupported_top_level_lines(source, process_analysis)
  lines = normalize_source(source).split("\n", -1)
  claimed = ruby_tslp_claimed_line_indexes(lines, process_analysis)
  lines.each_index.filter_map do |index|
    next if claimed.include?(index)

    line = lines[index]
    next if line.strip.empty? || comment_line?(line)

    index + 1
  end
end

#ruby_vcs_tool_integration_profile ⇒ Object 



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# File 'lib/ruby/merge.rb', line 702

def ruby_vcs_tool_integration_profile
  {
    profile_id: 'ruby-vcs-tool-integration',
    hosts: {
      git_merge_driver: {
        contract: 'git_merge_driver',
        placeholders: %w[%O %A %B %P],
        output_target: '%A',
        standard_marker_modes: %w[diff3 zdiff3 merge],
        marker_size: 'host_provided'
      },
      jujutsu_merge_tool: {
        contract: 'jj_merge_tool',
        roles: %w[base left right output path],
        output_target: 'output',
        standard_marker_modes: %w[diff3 merge],
        marker_size: 'host_provided'
      }
    },
    enhanced_markers: {
      optional: true,
      requires_host_tolerance: true,
      default: 'standard_markers'
    },
    audit_artifact: {
      enabled: true,
      formats: %w[json],
      fields: %w[host operation path fallback_reason validation_warnings conflict_kind timeout_ms]
    },
    resource_budget: {
      timeout_ms: 5000,
      timeout_outcome: 'fallback_or_driver_error',
      cannot_hang_vcs_operation: true
    },
    diagnostics: %w[
      structured_merge_skipped
      fallback_activated
      driver_invocation_error
      tool_invocation_error
      timeout_or_resource_budget
    ]
  }
end

#ruby_vcs_tool_invocation_report(host:, event:, path:, timeout_ms: 5000) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 746

def ruby_vcs_tool_invocation_report(host:, event:, path:, timeout_ms: 5000)
  severity = event.to_s.end_with?('error') ? 'error' : 'warning'

  {
    host: host,
    event: event,
    path: path,
    integration_profile: ruby_vcs_tool_integration_profile.fetch(:profile_id),
    marker_mode: 'standard_markers',
    marker_size: 'host_provided',
    audit_artifact: {
      format: 'json',
      required: true
    },
    timeout_ms: timeout_ms,
    resource_budget_enforced: true,
    diagnostics: [
      {
        severity: severity,
        category: event,
        message: "Ruby #{host} integration reported #{event} for #{path}."
      }
    ]
  }
end

#significant_source_lines(source) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1501

def significant_source_lines(source)
  normalize_source(source).lines.map(&:strip).reject do |line|
    line.empty? || line.start_with?('#') || line == 'end'
  end
end

#source_owner_identity_entry(kind:, name:, parent_scope:, address:, content:) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1911

def source_owner_identity_entry(kind:, name:, parent_scope:, address:, content:)
  normalized_kind = kind.to_s
  normalized_name = name.to_s
  {
    owner_kind: normalized_kind,
    owner_name: normalized_name,
    parent_scope: parent_scope,
    address: address,
    structural_identity: "#{parent_scope}:#{normalized_kind}:#{normalized_name}",
    content_identity: "sha256:#{Digest::SHA256.hexdigest(content.to_s)}",
    identity_components: %w[owner_kind owner_name parent_scope content_identity]
  }
end

#stable_owner_signatures(owner_identities) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1489

def stable_owner_signatures(owner_identities)
  owner_identities.map do |identity|
    {
      owner_kind: identity.fetch(:owner_kind),
      owner_name: identity.fetch(:owner_name),
      parent_scope: identity.fetch(:parent_scope),
      structural_identity: identity.fetch(:structural_identity),
      occurrence_index: identity.fetch(:occurrence_index)
    }
  end
end