Class: MilkTea::ModuleLoader

Inherits:
Object
  • Object
show all
Defined in:
lib/milk_tea/core/module_loader.rb,
lib/milk_tea/core/module_loader/errors.rb

Defined Under Namespace

Classes: ImportResolution, ImportResolutionError, Program

Constant Summary collapse

PLATFORM_SUFFIXES = 
{
  "linux" => :linux,
  "windows" => :windows,
  "wasm" => :wasm,
}.freeze

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(module_roots: [MilkTea.root], package_graph: nil, shared_cache: nil, source_overrides: nil, platform: nil) ⇒ ModuleLoader

Returns a new instance of ModuleLoader.



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# File 'lib/milk_tea/core/module_loader.rb', line 93

def initialize(module_roots: [MilkTea.root], package_graph: nil, shared_cache: nil, source_overrides: nil, platform: nil)
  @module_roots = module_roots.map { |root| File.expand_path(root.to_s) }
  @ast_cache = {}
  @parse_cache = {}
  @analysis_cache = {}
  @collecting_analysis_cache = {}
  @collecting_path_errors = {}
  @checking_paths = []
  @forward_bindings = {}
  @platform = self.class.normalize_platform_name(platform)
  @package_graph = package_graph
  @package_manifest_cache = {}
  @shared_cache = shared_cache # Hash or nil; mutated in-place to persist across calls
  @source_overrides = normalize_source_overrides(source_overrides)

  @path_resolver = ModulePathResolver.new(
    module_roots: @module_roots,
    platform: @platform,
    package_graph: @package_graph,
    source_overrides: @source_overrides,
    package_manifest_cache: @package_manifest_cache,
  )
  @binder = ModuleBinder.new
  @async_runtime_installer = AsyncRuntimeInstaller.new(
    resolve_module_path: @path_resolver.method(:resolve_module_path),
    check_block: ->(path, collecting) { collecting ? check_path_collecting_errors(path) : check_path(path) },
    bind_block: @binder.method(:module_binding),
  )
  @prelude_installer = PreludeInstaller.new(
    resolve_module_path: @path_resolver.method(:resolve_module_path),
    check_block: ->(path, collecting) { collecting ? check_path_collecting_errors(path) : check_path(path) },
    bind_block: @binder.method(:module_binding),
  )
end

Class Method Details

.check_file(path, platform: nil) ⇒ Object 



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# File 'lib/milk_tea/core/module_loader.rb', line 22

def self.check_file(path, platform: nil)
  new(platform:).check_file(path)
end

.check_program(path, platform: nil) ⇒ Object 



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# File 'lib/milk_tea/core/module_loader.rb', line 26

def self.check_program(path, platform: nil)
  new(platform:).check_program(path)
end

.default_host_platform ⇒ Object 



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# File 'lib/milk_tea/core/module_loader.rb', line 89

def self.default_host_platform
  MilkTea.host_platform
end

.effective_platform_for_path(path, platform_override: nil, host_platform: nil) ⇒ Object 



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# File 'lib/milk_tea/core/module_loader.rb', line 54

def self.effective_platform_for_path(path, platform_override: nil, host_platform: nil)
  normalized_override = normalize_platform_name(platform_override)
  return normalized_override if normalized_override

  suffix_platform = platform_suffix_for_path(path)
  return suffix_platform if suffix_platform

  manifest_platform = PackageManifest.load(path).platform
  return manifest_platform if manifest_platform

  normalize_platform_name(host_platform || default_host_platform)
rescue PackageManifestError
  normalize_platform_name(host_platform || default_host_platform)
end

.load_file(path, platform: nil) ⇒ Object 



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# File 'lib/milk_tea/core/module_loader.rb', line 18

def self.load_file(path, platform: nil)
  new(platform:).load_file(path)
end

.normalize_platform_name(value) ⇒ Object 



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# File 'lib/milk_tea/core/module_loader.rb', line 30

def self.normalize_platform_name(value)
  return nil if value.nil? || value.to_s.strip.empty?

  case value.to_s.strip.downcase
  when "linux"
    :linux
  when "windows", "win", "win32"
    :windows
  when "wasm", "web", "html5", "browser"
    :wasm
  when "darwin", "macos", "osx"
    :darwin
  else
    raise ArgumentError, "unknown platform #{value}; expected linux|windows|wasm|darwin"
  end
end

.platform_suffix_for_path(path) ⇒ Object 



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# File 'lib/milk_tea/core/module_loader.rb', line 47

def self.platform_suffix_for_path(path)
  match = File.basename(path.to_s).match(/\.(linux|windows|wasm)\.mt\z/)
  return nil unless match

  PLATFORM_SUFFIXES.fetch(match[1])
end

.raise_platform_conflict!(path, pinned_platform, active_platform, error_class: nil) ⇒ Object

Raises:

  • (error_class || ArgumentError) 


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# File 'lib/milk_tea/core/module_loader.rb', line 383

def self.raise_platform_conflict!(path, pinned_platform, active_platform, error_class: nil)
  if error_class == ModuleLoadError
    raise ModuleLoadError.new("source file targets platform #{pinned_platform}; active platform is #{active_platform}", path:)
  end

  message = "source file #{path} targets platform #{pinned_platform}; active platform is #{active_platform}"
  raise(error_class || ArgumentError, message)
end

.resolve_source_path(path, platform: nil, error_class: nil) ⇒ Object 



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# File 'lib/milk_tea/core/module_loader.rb', line 69

def self.resolve_source_path(path, platform: nil, error_class: nil)
  expanded_path = File.expand_path(path.to_s)
  normalized_platform = platform.nil? ? nil : normalize_platform_name(platform)
  pinned_platform = platform_suffix_for_path(expanded_path)

  if pinned_platform
    if normalized_platform && normalized_platform != pinned_platform
      raise_platform_conflict!(expanded_path, pinned_platform, normalized_platform, error_class:)
    end
    return expanded_path
  end

  return expanded_path unless normalized_platform && expanded_path.end_with?(".mt")

  variant_path = expanded_path.sub(/\.mt\z/, ".#{normalized_platform}.mt")
  return variant_path if File.file?(variant_path)

  expanded_path
end

Instance Method Details

#build_global_import_index(ast) ⇒ Object 



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# File 'lib/milk_tea/core/module_loader.rb', line 318

def build_global_import_index(ast)
  index = {}
  current_imports = ast.imports.map { |import| import.path.to_s }.to_set

  @analysis_cache.each_value do |analysis|
    next unless analysis
    next unless analysis.module_name

    mod_name = analysis.module_name.to_s
    next if current_imports.include?(mod_name)
    next if mod_name == ast.module_name.to_s

    types = analysis.respond_to?(:types) ? analysis.types : {}
    types.each_key do |type_name|
      type_str = type_name.to_s
      index[type_str] ||= []
      index[type_str] << mod_name unless index[type_str].include?(mod_name)
    end
  end

  index
end

#check_file(path) ⇒ Object 



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# File 'lib/milk_tea/core/module_loader.rb', line 133

def check_file(path)
  check_program(path).root_analysis
end

#check_level_parallel(paths) ⇒ Object 



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# File 'lib/milk_tea/core/module_loader.rb', line 279

def check_level_parallel(paths)
  threads = paths.map do |resolved_path|
    Thread.new do
      Thread.current[:resolved_path] = resolved_path
      begin
        analysis = check_path(resolved_path)
        Thread.current[:analysis] = analysis
      rescue ModuleLoadError, PackageLockError, SemanticError => e
        Thread.current[:error] = e
      end
    end
  end

  threads.each(&:join)

  paths.zip(threads).each do |resolved_path, t|
    raise t[:error] if t[:error]
  end
end

#check_module_cache(path, extra_cache: nil) ⇒ Object 



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# File 'lib/milk_tea/core/module_loader.rb', line 432

def check_module_cache(path, extra_cache: nil)
  resolved_path = self.class.resolve_source_path(path, platform: @platform, error_class: ModuleLoadError)

  return [resolved_path, nil, @analysis_cache[resolved_path]] if @analysis_cache.key?(resolved_path)
  return [resolved_path, nil, extra_cache[resolved_path]] if extra_cache&.key?(resolved_path)

  if use_shared_cache?
    entry = @shared_cache[resolved_path]
    if entry
      mtime = File.mtime(resolved_path).to_f rescue nil
      if mtime && entry[:mtime] == mtime
        @analysis_cache[resolved_path] = entry[:analysis]
        return [resolved_path, nil, entry[:analysis]]
      end
    end
  end

  ast = load_file(resolved_path)
  [resolved_path, ast, nil]
end

#check_path(path) ⇒ Object 



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# File 'lib/milk_tea/core/module_loader.rb', line 392

def check_path(path)
  resolved_path, ast, cached = check_module_cache(path)
  return cached if cached

  if @checking_paths.include?(resolved_path) && !@forward_bindings.key?(resolved_path)
    raise ModuleLoadError.new("circular import not resolvable: module #{@parse_cache[resolved_path]&.module_name || File.basename(path)}", path: resolved_path)
  end

  @checking_paths << resolved_path
  imported_modules = imported_modules_for_ast(ast, importer_path: resolved_path)
  global_index = build_global_import_index(ast)
  analysis = SemanticAnalyzer.check(ast, imported_modules:, path: resolved_path, global_import_index: global_index)
  @analysis_cache[resolved_path] = analysis
  update_shared_cache(resolved_path, analysis)
  analysis
ensure
  @checking_paths.pop
end

#check_path_collecting_errors(path) ⇒ Object 



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# File 'lib/milk_tea/core/module_loader.rb', line 411

def check_path_collecting_errors(path)
  resolved_path, ast, cached = check_module_cache(path, extra_cache: @collecting_analysis_cache)
  return cached if cached

  if @checking_paths.include?(resolved_path) && !@forward_bindings.key?(resolved_path)
    raise ModuleLoadError.new("circular import not resolvable: module #{@parse_cache[resolved_path]&.module_name || File.basename(path)}", path: resolved_path)
  end

  @checking_paths << resolved_path
  imported_modules = imported_modules_for_ast_collecting_errors(ast, importer_path: resolved_path).modules
  result = SemanticAnalyzer.check_collecting_errors(ast, imported_modules:, path: resolved_path)
  analysis = result[:analysis]
  raise(result[:errors].first || ModuleLoadError.new("module analysis unavailable", path: resolved_path)) unless analysis

  @collecting_path_errors[resolved_path] = result[:errors]
  @collecting_analysis_cache[resolved_path] = analysis
  analysis
ensure
  @checking_paths.pop
end

#check_program(path) ⇒ Object 



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# File 'lib/milk_tea/core/module_loader.rb', line 137

def check_program(path)
  Types::Registry.reset!
  requested_path = File.expand_path(path)
  previous_platform = @platform
  @platform ||= self.class.platform_suffix_for_path(requested_path)
  root_path = self.class.resolve_source_path(requested_path, platform: @platform, error_class: ModuleLoadError)

  check_program_parallel(root_path)

  root_analysis = @analysis_cache.fetch(root_path)
  analyses_by_module_name = @analysis_cache.each_value.each_with_object({}) do |analysis, modules|
    next unless analysis.module_name

    modules[analysis.module_name] = analysis
  end

  Program.new(
    root_path:,
    root_analysis:,
    analyses_by_path: @analysis_cache.dup.freeze,
    analyses_by_module_name: analyses_by_module_name.freeze,
  )
ensure
  @platform = previous_platform
end

#check_program_parallel(root_path) ⇒ Object 



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# File 'lib/milk_tea/core/module_loader.rb', line 163

def check_program_parallel(root_path)
  # Phase 1: Parse all transitive modules (sequential)
  parse_all(root_path)

  # Phase 2: Build dependency graph from parsed ASTs
  graph = {}
  @parse_cache.each_key do |resolved_path|
    ast = @parse_cache[resolved_path]
    deps = ast.imports.map do |import|
      @path_resolver.resolve_module_path(import.path.to_s, importer_path: resolved_path, importer_module_name: ast.module_name.to_s)
    end
    graph[resolved_path] = deps
  end

  # Phase 3: Topological sort into independent levels
  levels = topo_sort_levels(graph)

  # Pre-register forward bindings for cycle members
  all_checked = levels.flatten.to_set
  cycle_members = graph.keys.reject { |p| all_checked.include?(p) }
  cycle_members.each do |resolved_path|
    ast = @parse_cache[resolved_path]
    @forward_bindings[resolved_path] = create_forward_binding(ast)
  end

  # Phase 4: Check cycle members with iterative refinement
  # Pass 1: Check with forward bindings — registers type declarations.
  # SemanticError is expected (forward types lack fields/constructors)
  # but ModuleLoadError indicates a broken dependency graph.
  cycle_members.each do |resolved_path|
    check_path(resolved_path)
  rescue SemanticError
    # Forward types can't satisfy constructors. Pass 2 will retry.
  end

  # Update forward type objects in-place with field/arm info from the
  # real analyses. This way, all references to forward types (function
  # return types, struct field types, etc.) automatically see the full
  # type information without needing to replace the objects themselves.
  cycle_members.each do |resolved_path|
    analysis = @analysis_cache[resolved_path]
    next unless analysis

    fw_binding = @forward_bindings[resolved_path]
    next unless fw_binding

    analysis.types.each do |name, real_type|
      fw_type = fw_binding.types[name]
      next unless fw_type

      if real_type.respond_to?(:fields) && fw_type.respond_to?(:define_fields)
        fw_type.define_fields(real_type.fields) unless real_type.fields.empty?
      end
      if real_type.respond_to?(:arms) && fw_type.respond_to?(:define_arms)
        fw_type.define_arms(real_type.arms) unless real_type.arms.empty?
      end
    end
  end

  # Pass 2: Re-check with populated types — now cycle members see
  # complete type information for each other.
  cycle_members.each do |resolved_path|
    previous = @analysis_cache.delete(resolved_path)
    check_path(resolved_path)
  rescue SemanticError
    @analysis_cache[resolved_path] = previous if previous
  end
  @forward_bindings.clear

  # Phase 5: Check acyclic modules (they see fully-checked analyses for all imports)
  levels.each do |level_paths|
    if level_paths.length == 1
      check_path(level_paths.first)
    else
      check_level_parallel(level_paths)
    end
  end
end

#collecting_path_errors ⇒ Object

Errors collected per analyzed import path during collecting-mode checks. Populated by #check_path_collecting_errors; used by the CLI check command to surface errors in a single file's imported modules (otherwise only reported when that module is checked directly).



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# File 'lib/milk_tea/core/module_loader.rb', line 379

def collecting_path_errors
  @collecting_path_errors
end

#create_forward_binding(ast) ⇒ Object 



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# File 'lib/milk_tea/core/module_loader.rb', line 519

def create_forward_binding(ast)
  module_name = ast.module_name.to_s
  types = {}

  ast.declarations.each do |decl|
    case decl
    when AST::StructDecl
      types[decl.name] = Types::Struct.new(decl.name, module_name:)
    when AST::VariantDecl
      types[decl.name] = Types::Variant.new(decl.name, module_name:)
    when AST::EnumDecl
      types[decl.name] = Types::Enum.new(decl.name, module_name:)
    when AST::FlagsDecl
      types[decl.name] = Types::Flags.new(decl.name, module_name:)
    when AST::OpaqueDecl
      types[decl.name] = Types::Opaque.new(decl.name, module_name:, external: false)
    end
  end

  ModuleBinding.new(
    name: module_name, types:, type_declarations: {},
    interfaces: {}, attributes: {}, attribute_applications: {},
    values: {}, functions: {}, methods: {},
    implemented_interfaces: {}, imports: {},
    private_types: {}, private_interfaces: {}, private_attributes: {},
    private_values: {}, private_functions: {}, private_methods: {},
    private_implemented_interfaces: {},
  )
end

#imported_modules_for_ast(ast, importer_path: nil) ⇒ Object 



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# File 'lib/milk_tea/core/module_loader.rb', line 299

def imported_modules_for_ast(ast, importer_path: nil)
  modules = {}

  ast.imports.each do |import|
    import_path = @path_resolver.resolve_module_path(import.path.to_s, importer_path:, importer_module_name: ast.module_name.to_s)

    if @forward_bindings.key?(import_path)
      modules[import.path.to_s] = @forward_bindings[import_path]
    else
      import_analysis = check_path(import_path)
      modules[import.path.to_s] = @binder.module_binding(import_analysis)
    end
  end

  @async_runtime_installer.install_async_runtime_dependency!(ast, modules, importer_path:, collecting_errors: false)
  @prelude_installer.install_prelude_modules!(ast, modules, importer_path:, collecting_errors: false)
  modules.freeze
end

#imported_modules_for_ast_collecting_errors(ast, importer_path: nil) ⇒ Object 



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# File 'lib/milk_tea/core/module_loader.rb', line 341

def imported_modules_for_ast_collecting_errors(ast, importer_path: nil)
  modules = {}
  errors = []

  ast.imports.each do |import|
    begin
      import_path = @path_resolver.resolve_module_path(import.path.to_s, importer_path:, importer_module_name: ast.module_name.to_s)

      if @forward_bindings.key?(import_path)
        modules[import.path.to_s] = @forward_bindings[import_path]
      else
        import_analysis = check_path_collecting_errors(import_path)
        modules[import.path.to_s] = @binder.module_binding(import_analysis)
      end
    rescue ModuleLoadError, PackageLockError, SemanticError => e
      errors << ImportResolutionError.new(import:, error: e)
    end
  end

  begin
    @async_runtime_installer.install_async_runtime_dependency!(ast, modules, importer_path:, collecting_errors: true)
  rescue ModuleLoadError, PackageLockError => e
    errors << ImportResolutionError.new(import: nil, error: e)
  end

  begin
    @prelude_installer.install_prelude_modules!(ast, modules, importer_path:, collecting_errors: true)
  rescue ModuleLoadError, PackageLockError => e
    errors << ImportResolutionError.new(import: nil, error: e)
  end

  ImportResolution.new(modules: modules.freeze, errors: errors.freeze)
end

#inferred_module_name_for_path(path) ⇒ Object 



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# File 'lib/milk_tea/core/module_loader.rb', line 487

def inferred_module_name_for_path(path)
  manifest = begin
    PackageManifest.load(path)
  rescue PackageManifestError
    nil
  end

  if manifest && path_within_root?(path, manifest.source_root)
    return module_name_for_path(path, manifest.source_root)
  end

  matching_root = @module_roots
    .select { |root| path_within_root?(path, root) }
    .max_by(&:length)
  return module_name_for_path(path, matching_root) if matching_root

  File.basename(path).sub(/\.(linux|windows|wasm)\.mt\z/, ".mt").sub(/\.mt\z/, "")
end

#load_file(path) ⇒ Object 



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# File 'lib/milk_tea/core/module_loader.rb', line 128

def load_file(path)
  resolved_path = self.class.resolve_source_path(path, platform: @platform, error_class: ModuleLoadError)
  @ast_cache[resolved_path] ||= parse_file(resolved_path)
end

#module_name_for_path(path, root) ⇒ Object 



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# File 'lib/milk_tea/core/module_loader.rb', line 506

def module_name_for_path(path, root)
  relative_path = path.delete_prefix(File.expand_path(root) + File::SEPARATOR)
  relative_path = File.basename(path) if relative_path == path
  relative_path = relative_path.sub(/\.(linux|windows|wasm)\.mt\z/, '.mt')
  relative_path.sub(/\.mt\z/, '').split(File::SEPARATOR).join('.')
end

#normalize_source_overrides(source_overrides) ⇒ Object 



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# File 'lib/milk_tea/core/module_loader.rb', line 479

def normalize_source_overrides(source_overrides)
  return {} unless source_overrides

  source_overrides.each_with_object({}) do |(path, source), overrides|
    overrides[File.expand_path(path.to_s)] = source.to_s
  end
end

#parse_all(resolved_path) ⇒ Object 



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# File 'lib/milk_tea/core/module_loader.rb', line 242

def parse_all(resolved_path)
  return if @parse_cache.key?(resolved_path)

  @checking_paths << resolved_path
  ast = load_file(resolved_path)
  @parse_cache[resolved_path] = ast

  ast.imports.each do |import|
    import_path = @path_resolver.resolve_module_path(import.path.to_s, importer_path: resolved_path, importer_module_name: ast.module_name.to_s)
    parse_all(import_path)
  end
ensure
  @checking_paths.pop
end

#parse_file(path) ⇒ Object 



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# File 'lib/milk_tea/core/module_loader.rb', line 460

def parse_file(path)
  source = @source_overrides.fetch(path) { File.read(path) }
  ast = Parser.parse(source, path: path)
  inferred_module_name = inferred_module_name_for_path(path)
  AST::SourceFile.new(
    module_name: AST::QualifiedName.new(inferred_module_name.split(".")),
    module_kind: ast.module_kind,
    imports: ast.imports,
    directives: ast.directives,
    declarations: ast.declarations,
    line: ast.line,
    node_ids: ast.node_ids,
  )
rescue Errno::ENOENT
  raise ModuleLoadError.new("source file not found", path: path)
rescue Errno::EISDIR
  raise ModuleLoadError.new("expected a source file, got a directory", path: path)
end

#path_within_root?(path, root) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/core/module_loader.rb', line 513

def path_within_root?(path, root)
  normalized_path = File.expand_path(path)
  normalized_root = File.expand_path(root)
  normalized_path == normalized_root || normalized_path.start_with?(normalized_root + File::SEPARATOR)
end

#topo_sort_levels(graph) ⇒ Object 



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# File 'lib/milk_tea/core/module_loader.rb', line 257

def topo_sort_levels(graph)
  in_degree = {}
  graph.each_key { |node| in_degree[node] = 0 }
  graph.each_value do |deps|
    deps.each { |dep| in_degree[dep] = (in_degree[dep] || 0) + 1 }
  end

  levels = []
  remaining = graph.keys.to_set
  until remaining.empty?
    level = remaining.select { |node| (in_degree[node] || 0) == 0 }
    break if level.empty?

    levels << level
    level.each do |node|
      remaining.delete(node)
      (graph[node] || []).each { |dep| in_degree[dep] -= 1 }
    end
  end
  levels
end

#update_shared_cache(resolved_path, analysis) ⇒ Object 



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# File 'lib/milk_tea/core/module_loader.rb', line 453

def update_shared_cache(resolved_path, analysis)
  return unless use_shared_cache?

  mtime = File.mtime(resolved_path).to_f rescue nil
  @shared_cache[resolved_path] = { mtime:, analysis: } if mtime
end

#use_shared_cache? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/core/module_loader.rb', line 549

def use_shared_cache?
  @shared_cache && @source_overrides.empty?
end