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

Overview

Public Ruby parser-family substrate for Structured Merge.

The adapter deliberately keeps parser capability reporting, ownership discovery, merge planning, and source reconstruction together. Splitting those phases to satisfy generic size metrics would obscure the contract they implement and make provider behavior harder to audit. rubocop:disable Metrics/AbcSize, Metrics/BlockLength, Metrics/BlockNesting rubocop:disable Metrics/ClassLength, Metrics/CyclomaticComplexity, Metrics/MethodLength rubocop:disable Metrics/ModuleLength, Metrics/PerceivedComplexity rubocop:disable Style/MultilineBlockChain

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*[!?=]?|\[\]=?|\+@|-@|\*\*|<<|>>|<=>|===|==|=~|!~|!=|[+\-*/%&|^<>]=?|[!~`])
}x
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 1287

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 1116

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 81

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 1704

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 172

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 239

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)
  namespace_equivalence_available = TreeHaver::BackendRegistry.tag_available?(
    :tslp_ruby_namespace_form_equivalence
  )
  unless namespace_conflicts.empty? || namespace_equivalence_available
    conflicts = namespace_conflicts.join(', ')
    return unsupported_feature_result(
      'ruby-merge cannot reconcile equivalent Ruby namespace declaration forms with the active TSLP records: ' \
      "#{conflicts}. Use a native Ruby provider 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 1150

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 1177

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 1205

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 1251

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 1228

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 1269

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 132

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 92

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 348

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 344

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

.ruby_feature_profile ⇒ Object 



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# File 'lib/ruby/merge.rb', line 73

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 176

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: [
        if moved
          'same Ruby method signature observed at a different sibling position'
        else
          'same Ruby method signature observed at the same sibling position'
        end
      ]
    )
  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 105

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 85

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 2283

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 1988

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 1915

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 1373

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 1351

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 1538

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 2038

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 1844

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 1711

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 1672

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 1780

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 1650

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 2162

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 2132

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 2228

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 2110

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 2147

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 2210

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 2262

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 2181

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 1921

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 1568

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 2100

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 2090

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 2291

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 2013

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 1381

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 2195

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 2073

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 60

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 461

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 1633

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 706

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: if reconstruction_risk
                   'Ruby AST-node merge candidate has ambiguous whitespace, comment, or marker ' \
                   'reconstruction boundaries.'
                 else
                   'Ruby AST-node merge candidate can be considered when owner-level fallback would be too blunt.'
                 end
      }
    ]
  }
end

#ruby_ast_node_merge_strategy_profile ⇒ Object 



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# File 'lib/ruby/merge.rb', line 689

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 119

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 936

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 891

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 604

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 1065

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 1478

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 542

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 521

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 845

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: if widened
                   "Ruby fallback cannot widen from #{declared_scope} to #{requested_scope} without an " \
                   'explicit policy.'
                 else
                   'Ruby fallback scope is within the declared policy.'
                 end
      }
    ]
  }
end

#ruby_fallback_scope_rank(scope) ⇒ Object 



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# File 'lib/ruby/merge.rb', line 1546

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 1362

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 1496

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 655

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: if owners_preserved
                   'Ruby formatter adapter preserved owner identity, conflict scope, and validation semantics.'
                 else
                   'Ruby formatter adapter changed owner identity and cannot be accepted as a semantic merge.'
                 end
      }
    ]
  }
end

#ruby_formatter_policy_profile ⇒ Object 



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# File 'lib/ruby/merge.rb', line 636

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 1439

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 1429

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 1413

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 1521

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 926

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 867

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 1933

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 1454

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 2000

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 2058

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 2020

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 2026

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 1506

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 1960

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 561

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 1542

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 582

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 1389

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 1809

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 1620

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 1665

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 1794

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 1893

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 1884

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 1904

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 959

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 943

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 1013

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 810

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 417

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 394

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 494

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 384

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 1510

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 1461

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 1869

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 1831

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 1859

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 1608

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 1678

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 1691

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 1573

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 a native Ruby provider " \
      '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 1595

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 740

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 784

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 1562

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 1974

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 1550

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