Module: Json::Merge

Defined in:
lib/json/merge.rb,
lib/json/merge/emitter.rb,
lib/json/merge/version.rb,
lib/json/merge/freeze_node.rb,
lib/json/merge/debug_logger.rb,
lib/json/merge/merge_result.rb,
lib/json/merge/node_wrapper.rb,
lib/json/merge/smart_merger.rb,
lib/json/merge/file_analysis.rb,
lib/json/merge/comment_tracker.rb,
lib/json/merge/conflict_resolver.rb,
lib/json/merge/object_match_refiner.rb,
sig/json/merge.rbs

Defined Under Namespace

Modules: DebugLogger, Version Classes: CommentTracker, ConflictResolver, CorruptionDetectedError, DestinationParseError, Emitter, Error, FileAnalysis, FreezeNode, JsoncDialectError, MergeResult, NodeWrapper, ObjectMatchRefiner, ParseError, SmartMerger, TemplateParseError

Constant Summary collapse

PACKAGE_NAME = 
'json-merge'
DESTINATION_WINS_ARRAY_POLICY = 
{
  surface: 'array',
  name: 'destination_wins_array'
}.freeze
TREE_SITTER_BACKEND = 
TreeHaver::KREUZBERG_LANGUAGE_PACK_BACKEND
BACKEND_REGISTRY = 
Struct.new(:registered, :mutex).new(false, Mutex.new)
VERSION =

Current gem version exposed at the traditional constant location.

Returns:

  • (String) 
Version::VERSION

Class Method Summary collapse

Class Method Details

.available_json_backends ⇒ Object 



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# File 'lib/json/merge.rb', line 70

def available_json_backends
  json_backend_available_for_analysis?(TREE_SITTER_BACKEND.id) ? [TREE_SITTER_BACKEND] : []
end

.decode_string_literal(text, dialect: :json) ⇒ Object 



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# File 'lib/json/merge.rb', line 243

def decode_string_literal(text, dialect: :json)
  return decode_json_string_literal(text) unless dialect == :json5

  decode_json5_string_literal(text)
end

.json_backend_feature_profile(backend: nil) ⇒ Object 



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# File 'lib/json/merge.rb', line 74

def json_backend_feature_profile(backend: nil)
  requested = requested_json_backend_id(backend)
  unless available_json_backends.any? { |backend_ref| backend_ref.id == requested }
    return unsupported_feature_result("Unsupported JSON backend #{requested}.")
  end

  json_feature_profile.merge(
    backend: requested,
    backend_ref: TREE_SITTER_BACKEND.to_h
  )
end

.json_feature_profile ⇒ Object 



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# File 'lib/json/merge.rb', line 62

def json_feature_profile
  {
    family: 'json',
    supported_dialects: %w[json jsonc json5],
    supported_policies: [DESTINATION_WINS_ARRAY_POLICY]
  }
end

.json_plan_context(backend: nil) ⇒ Object 



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# File 'lib/json/merge.rb', line 86

def json_plan_context(backend: nil)
  profile = json_backend_feature_profile(backend: backend)
  return profile if profile[:ok] == false

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

.json_value_for_node(node, dialect: :json) ⇒ Object 



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# File 'lib/json/merge.rb', line 206

def json_value_for_node(node, dialect: :json)
  case node.type.to_s
  when 'document'
    child = node.semantic_children.first
    if child
      json_value_for_node(NodeWrapper.new(child, lines: node.lines, source: node.source, dialect: dialect),
                          dialect: dialect)
    end
  when 'object'
    node.pairs.each_with_object({}) do |pair, object|
      key = pair.key_name
      next unless key

      object[key] = json_value_for_node(pair.value_node, dialect: dialect)
    end
  when 'array'
    node.elements.map { |element| json_value_for_node(element, dialect: dialect) }
  when 'string'
    decode_string_literal(node.text, dialect: dialect)
  when 'number'
    parse_number_literal(node.text, dialect: dialect)
  when 'true'
    true
  when 'false'
    false
  when 'null'
    nil
  end
end

.json_value_for_source(source, dialect: 'json', backend: nil) ⇒ Object

Raises:



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# File 'lib/json/merge.rb', line 183

def json_value_for_source(source, dialect: 'json', backend: nil)
  dialect = normalize_json_dialect(dialect)
  requested = requested_json_backend_id(backend)
  unless json_backend_available_for_analysis?(requested, dialect: dialect)
    raise ParseError, "Unsupported JSON backend #{requested}."
  end

  if dialect == :json && detect_trailing_comma(source)
    raise ParseError,
          "Trailing commas are not supported for #{dialect}."
  end
  raise ParseError, "Comments are not supported for #{dialect}." if dialect == :json && detect_json_comments(source)

  register_backend!
  analysis = TreeHaver.with_backend(requested) { FileAnalysis.new(source, dialect: dialect) }
  unless analysis.valid?
    message = analysis.errors.map { |error| error.respond_to?(:message) ? error.message : error.inspect }.join(', ')
    raise ParseError, message
  end

  json_value_for_node(analysis.root_node, dialect: dialect)
end

.match_json_owners(template, destination) ⇒ Object 



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# File 'lib/json/merge.rb', line 137

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

.merge_json(template_source, destination_source, dialect, backend: nil) ⇒ Object 



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# File 'lib/json/merge.rb', line 141

def merge_json(template_source, destination_source, dialect, backend: nil)
  dialect = normalize_json_dialect(dialect)
  requested = requested_json_backend_id(backend)
  unless json_backend_available_for_analysis?(requested, dialect: dialect)
    return unsupported_feature_result("Unsupported JSON backend #{requested}.")
  end

  template_result = parse_json(template_source, dialect, backend: requested)
  return { ok: false, diagnostics: template_result[:diagnostics] } unless template_result[:ok]

  destination_result = parse_json(destination_source, dialect, backend: requested)
  if destination_result[:ok]
    return {
      ok: true,
      diagnostics: [],
      output: TreeHaver.with_backend(requested) do
        merge_json_sources(template_source, destination_source, dialect: dialect)
      end,
      policies: [DESTINATION_WINS_ARRAY_POLICY]
    }
  end

  {
    ok: false,
    diagnostics: destination_result[:diagnostics].map do |diagnostic|
      diagnostic[:category] == 'parse_error' ? diagnostic.merge(category: 'destination_parse_error') : diagnostic
    end
  }
end

.object_key_for_literal(text, dialect: :json) ⇒ Object 



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# File 'lib/json/merge.rb', line 236

def object_key_for_literal(text, dialect: :json)
  literal = text.to_s
  return literal if dialect == :json5 && !%w[' "].include?(literal[0])

  decode_string_literal(literal, dialect: dialect)
end

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



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# File 'lib/json/merge.rb', line 100

def parse_json(source, dialect, backend: nil)
  dialect = normalize_json_dialect(dialect)
  requested = requested_json_backend_id(backend)
  unless json_backend_available_for_analysis?(requested, dialect: dialect)
    return unsupported_feature_result("Unsupported JSON backend #{requested}.")
  end

  if dialect == :json && detect_trailing_comma(source)
    return parse_failure("Trailing commas are not supported for #{dialect}.")
  end
  if dialect == :json && detect_json_comments(source)
    return parse_failure("Comments are not supported for #{dialect}.")
  end

  register_backend!
  analysis = TreeHaver.with_backend(requested) { FileAnalysis.new(source, dialect: dialect) }
  unless analysis.valid?
    return parse_failure(analysis.errors.map do |error|
      error.respond_to?(:message) ? error.message : error.inspect
    end.join(', '))
  end

  {
    ok: true,
    diagnostics: [],
    analysis: {
      dialect: dialect.to_s,
      allows_comments: %i[jsonc json5].include?(dialect),
      root_kind: json_analysis_root_kind(analysis),
      owners: collect_file_analysis_owners(analysis)
    },
    policies: []
  }
rescue TreeHaver::Error, StandardError => e
  parse_failure(e.message)
end

.parse_number_literal(text, dialect: :json) ⇒ Object 



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# File 'lib/json/merge.rb', line 317

def parse_number_literal(text, dialect: :json)
  return parse_json_number(text) unless dialect == :json5

  literal = text.to_s.delete('_')
  return Float::INFINITY if ['Infinity', '+Infinity'].include?(literal)
  return -Float::INFINITY if literal == '-Infinity'
  return Float::NAN if %w[NaN +NaN -NaN].include?(literal)

  Integer(literal, 0)
rescue ArgumentError
  Float(literal)
end

.register_backend! ⇒ Object 



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# File 'lib/json/merge.rb', line 43

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

    TreeHaver::BackendRegistry.register(TREE_SITTER_BACKEND)

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

    json5_grammar_finder = TreeHaver::GrammarFinder.new(:json5)
    json5_grammar_finder.register! if json5_grammar_finder.available?

    BACKEND_REGISTRY.registered = true
  end
end