Class: RBI::RBSPrinter

Inherits:
Visitor show all
Defined in:
lib/rbi/rbs_printer.rb

Defined Under Namespace

Classes: Error

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from Visitor

#visit

Constructor Details

#initialize(out: $stdout, indent: 0, print_locs: false, positional_names: true) ⇒ RBSPrinter

: (?out: (IO | StringIO), ?indent: Integer, ?print_locs: bool, ?positional_names: bool) -> void



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# File 'lib/rbi/rbs_printer.rb', line 21

def initialize(out: $stdout, indent: 0, print_locs: false, positional_names: true)
  super()
  @out = out
  @current_indent = indent
  @print_locs = print_locs
  @in_visibility_group = T.let(false, T::Boolean)
  @previous_node = T.let(nil, T.nilable(Node))
  @positional_names = T.let(positional_names, T::Boolean)
end

Instance Attribute Details

#current_indent ⇒ Object (readonly)

: Integer



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# File 'lib/rbi/rbs_printer.rb', line 15

def current_indent
  @current_indent
end

#in_visibility_group ⇒ Object

: bool



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# File 'lib/rbi/rbs_printer.rb', line 9

def in_visibility_group
  @in_visibility_group
end

#positional_names ⇒ Object

: bool



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# File 'lib/rbi/rbs_printer.rb', line 18

def positional_names
  @positional_names
end

#previous_node ⇒ Object (readonly)

: Node?



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# File 'lib/rbi/rbs_printer.rb', line 12

def previous_node
  @previous_node
end

#print_locs ⇒ Object

: bool



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# File 'lib/rbi/rbs_printer.rb', line 9

def print_locs
  @print_locs
end

Instance Method Details

#dedent ⇒ Object

: -> void



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# File 'lib/rbi/rbs_printer.rb', line 39

def dedent
  @current_indent -= 2
end

#indent ⇒ Object

: -> void



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# File 'lib/rbi/rbs_printer.rb', line 34

def indent
  @current_indent += 2
end

#print(string) ⇒ Object

Print a string without indentation nor ‘n` at the end. : (String string) -> void



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# File 'lib/rbi/rbs_printer.rb', line 45

def print(string)
  @out.print(string)
end

#print_attr_sig(node, sig) ⇒ Object

: (RBI::Attr node, Sig sig) -> void



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# File 'lib/rbi/rbs_printer.rb', line 292

def print_attr_sig(node, sig)
  ret_type = sig.return_type

  type = case node
  when AttrReader, AttrAccessor
    parse_type(ret_type).rbs_string
  else
    # For attr_writer, Sorbet will prioritize the return type over the argument type in case of mismatch
    arg_type = sig.params.first
    if arg_type && (ret_type.is_a?(Type::Void) || ret_type == "void")
      # If we have an argument type and the return type is void, we prioritize the argument type
      parse_type(arg_type.type).rbs_string
    else
      # Otherwise, we prioritize the return type
      parse_type(ret_type).rbs_string
    end
  end

  print(type)
end

#print_method_sig(node, sig) ⇒ Object

: (RBI::Method node, Sig sig) -> void



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# File 'lib/rbi/rbs_printer.rb', line 381

def print_method_sig(node, sig)
  unless sig.type_params.empty?
    print("[#{sig.type_params.join(", ")}] ")
  end

  block_param = node.params.find { |param| param.is_a?(BlockParam) }
  sig_block_param = sig.params.find { |param| param.name == block_param&.name }

  sig_params = sig.params.dup
  if block_param
    sig_params.reject! do |param|
      param.name == block_param.name
    end
  end

  unless sig_params.empty?
    print("(")
    sig_params.each_with_index do |param, index|
      print(", ") if index > 0
      print_sig_param(node, param)
    end
    print(") ")
  end
  if sig_block_param
    block_type = sig_block_param.type
    block_type = Type.parse_string(block_type) if block_type.is_a?(String)

    block_is_nilable = false
    if block_type.is_a?(Type::Nilable)
      block_is_nilable = true
      block_type = block_type.type
    end

    type_string = parse_type(block_type).rbs_string.delete_prefix("^")

    skip = false
    case block_type
    when Type::Untyped
      type_string = "(?) -> untyped"
      block_is_nilable = true
    when Type::Simple
      type_string = "(?) -> untyped"
      skip = true if block_type.name == "NilClass"
    end

    if skip
      # no-op, we skip the block definition
    elsif block_is_nilable
      print("?{ #{type_string} } ")
    else
      print("{ #{type_string} } ")
    end
  end

  type = parse_type(sig.return_type)
  print("-> #{type.rbs_string}")

  loc = sig.loc
  print(" # #{loc}") if loc && print_locs
end

#printl(string) ⇒ Object

Print a string with indentation and ‘n` at the end. : (String string) -> void



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# File 'lib/rbi/rbs_printer.rb', line 65

def printl(string)
  printt
  printn(string)
end

#printn(string = nil) ⇒ Object

Print a string without indentation but with a ‘n` at the end. : (?String? string) -> void



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# File 'lib/rbi/rbs_printer.rb', line 51

def printn(string = nil)
  print(string) if string
  print("\n")
end

#printt(string = nil) ⇒ Object

Print a string with indentation but without a ‘n` at the end. : (?String? string) -> void



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# File 'lib/rbi/rbs_printer.rb', line 58

def printt(string = nil)
  print(" " * @current_indent)
  print(string) if string
end

#visit_all(nodes) ⇒ Object

: (Array nodes) -> void



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# File 'lib/rbi/rbs_printer.rb', line 72

def visit_all(nodes)
  previous_node = @previous_node
  @previous_node = nil
  nodes.each do |node|
    visit(node)
    @previous_node = node
  end
  @previous_node = previous_node
end

#visit_arg(node) ⇒ Object

: (Arg node) -> void



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# File 'lib/rbi/rbs_printer.rb', line 578

def visit_arg(node)
  # no-op
end

#visit_attr(node) ⇒ Object

: (Attr node) -> void



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# File 'lib/rbi/rbs_printer.rb', line 260

def visit_attr(node)
  print_blank_line_before(node)

  node.names.each do |name|
    visit_all(node.comments)
    print_loc(node)
    printt
    unless in_visibility_group || node.visibility.public? || node.visibility.protected?
      self.print(node.visibility.visibility.to_s)
      print(" ")
    end
    case node
    when AttrAccessor
      print("attr_accessor")
    when AttrReader
      print("attr_reader")
    when AttrWriter
      print("attr_writer")
    end
    print(" #{name}")
    first_sig, *_rest = node.sigs # discard remaining signatures
    if first_sig
      print(": ")
      print_attr_sig(node, first_sig)
    else
      print(": untyped")
    end
    printn
  end
end

#visit_attr_accessor(node) ⇒ Object

: (AttrAccessor node) -> void



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# File 'lib/rbi/rbs_printer.rb', line 243

def visit_attr_accessor(node)
  visit_attr(node)
end

#visit_attr_reader(node) ⇒ Object

: (AttrReader node) -> void



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# File 'lib/rbi/rbs_printer.rb', line 249

def visit_attr_reader(node)
  visit_attr(node)
end

#visit_attr_writer(node) ⇒ Object

: (AttrWriter node) -> void



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# File 'lib/rbi/rbs_printer.rb', line 255

def visit_attr_writer(node)
  visit_attr(node)
end

#visit_blank_line(node) ⇒ Object

: (BlankLine node) -> void



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# File 'lib/rbi/rbs_printer.rb', line 114

def visit_blank_line(node)
  printn
end

#visit_block_param(node) ⇒ Object

: (BlockParam node) -> void



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# File 'lib/rbi/rbs_printer.rb', line 510

def visit_block_param(node)
  print("{ (*untyped) -> untyped } ")
end

#visit_class(node) ⇒ Object

: (Class node) -> void



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# File 'lib/rbi/rbs_printer.rb', line 134

def visit_class(node)
  visit_scope(node)
end

#visit_comment(node) ⇒ Object

: (Comment node) -> void



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# File 'lib/rbi/rbs_printer.rb', line 97

def visit_comment(node)
  lines = node.text.lines

  if lines.empty?
    printl("#")
  end

  lines.each do |line|
    text = line.rstrip
    printt("#")
    print(" #{text}") unless text.empty?
    printn
  end
end

#visit_conflict_tree(node) ⇒ Object

: (ConflictTree node) -> void



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# File 'lib/rbi/rbs_printer.rb', line 711

def visit_conflict_tree(node)
  printl("<<<<<<< #{node.left_name}")
  visit(node.left)
  printl("=======")
  visit(node.right)
  printl(">>>>>>> #{node.right_name}")
end

#visit_const(node) ⇒ Object

: (Const node) -> void



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# File 'lib/rbi/rbs_printer.rb', line 227

def visit_const(node)
  print_blank_line_before(node)
  print_loc(node)
  visit_all(node.comments)

  type = parse_t_let(node.value)
  if type
    type = parse_type(type)
    printl("#{node.name}: #{type.rbs_string}")
  else
    printl("#{node.name}: untyped")
  end
end

#visit_extend(node) ⇒ Object

: (Extend node) -> void



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# File 'lib/rbi/rbs_printer.rb', line 522

def visit_extend(node)
  visit_mixin(node)
end

#visit_file(file) ⇒ Object

: (File file) -> void



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# File 'lib/rbi/rbs_printer.rb', line 84

def visit_file(file)
  unless file.comments.empty?
    visit_all(file.comments)
  end

  unless file.root.empty? && file.root.comments.empty?
    printn unless file.comments.empty?
    visit(file.root)
  end
end

#visit_group(node) ⇒ Object

: (Group node) -> void



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# File 'lib/rbi/rbs_printer.rb', line 684

def visit_group(node)
  printn unless previous_node.nil?
  visit_all(node.nodes)
end

#visit_helper(node) ⇒ Object

: (Helper node) -> void



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# File 'lib/rbi/rbs_printer.rb', line 672

def visit_helper(node)
  # no-op, we already show them in the scope header
end

#visit_include(node) ⇒ Object

: (Include node) -> void



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# File 'lib/rbi/rbs_printer.rb', line 516

def visit_include(node)
  visit_mixin(node)
end

#visit_kw_arg(node) ⇒ Object

: (KwArg node) -> void



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# File 'lib/rbi/rbs_printer.rb', line 584

def visit_kw_arg(node)
  # no-op
end

#visit_kw_opt_param(node) ⇒ Object

: (KwOptParam node) -> void



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# File 'lib/rbi/rbs_printer.rb', line 498

def visit_kw_opt_param(node)
  print("?#{node.name}: untyped")
end

#visit_kw_param(node) ⇒ Object

: (KwParam node) -> void



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# File 'lib/rbi/rbs_printer.rb', line 492

def visit_kw_param(node)
  print("#{node.name}: untyped")
end

#visit_kw_rest_param(node) ⇒ Object

: (KwRestParam node) -> void



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# File 'lib/rbi/rbs_printer.rb', line 504

def visit_kw_rest_param(node)
  print("**#{node.name}: untyped")
end

#visit_method(node) ⇒ Object

: (Method node) -> void



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# File 'lib/rbi/rbs_printer.rb', line 315

def visit_method(node)
  print_blank_line_before(node)
  visit_all(node.comments)

  if node.sigs.any?(&:is_abstract)
    printl("# @abstract")
  end

  if node.sigs.any?(&:is_override)
    if node.sigs.any?(&:allow_incompatible_override)
      printl("# @override(allow_incompatible: true)")
    else
      printl("# @override")
    end
  end

  if node.sigs.any?(&:is_overridable)
    printl("# @overridable")
  end

  if node.sigs.any?(&:is_final)
    printl("# @final")
  end

  print_loc(node)
  printt
  unless in_visibility_group || node.visibility.public?
    self.print(node.visibility.visibility.to_s)
    print(" ")
  end
  print("def ")
  print("self.") if node.is_singleton
  print(node.name)
  sigs = node.sigs
  print(": ")
  if sigs.any?
    first, *rest = sigs
    print_method_sig(node, T.must(first))
    if rest.any?
      spaces = node.name.size + 4
      rest.each do |sig|
        printn
        printt
        print("#{" " * spaces}| ")
        print_method_sig(node, sig)
      end
    end
  else
    if node.params.any?
      params = node.params.reject { |param| param.is_a?(BlockParam) }
      block = node.params.find { |param| param.is_a?(BlockParam) }

      print("(")
      params.each_with_index do |param, index|
        print(", ") if index > 0
        visit(param)
      end
      print(") ")
      visit(block)
    end
    print("-> untyped")
  end
  printn
end

#visit_mixes_in_class_methods(node) ⇒ Object

: (MixesInClassMethods node) -> void



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# File 'lib/rbi/rbs_printer.rb', line 678

def visit_mixes_in_class_methods(node)
  visit_mixin(node)
end

#visit_mixin(node) ⇒ Object

: (Mixin node) -> void



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# File 'lib/rbi/rbs_printer.rb', line 527

def visit_mixin(node)
  return if node.is_a?(MixesInClassMethods) # no-op, `mixes_in_class_methods` is not supported in RBS

  print_blank_line_before(node)
  print_loc(node)
  visit_all(node.comments)

  case node
  when Include
    printt("include")
  when Extend
    printt("extend")
  end
  printn(" #{node.names.join(", ")}")
end

#visit_module(node) ⇒ Object

: (Module node) -> void



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# File 'lib/rbi/rbs_printer.rb', line 128

def visit_module(node)
  visit_scope(node)
end

#visit_opt_param(node) ⇒ Object

: (OptParam node) -> void



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# File 'lib/rbi/rbs_printer.rb', line 472

def visit_opt_param(node)
  if @positional_names
    print("?untyped #{node.name}")
  else
    print("?untyped")
  end
end

#visit_private(node) ⇒ Object

: (Private node) -> void



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# File 'lib/rbi/rbs_printer.rb', line 557

def visit_private(node)
  visit_visibility(node)
end

#visit_protected(node) ⇒ Object

: (Protected node) -> void



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# File 'lib/rbi/rbs_printer.rb', line 551

def visit_protected(node)
  # no-op, `protected` is not supported in RBS
end

#visit_public(node) ⇒ Object

: (Public node) -> void



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# File 'lib/rbi/rbs_printer.rb', line 545

def visit_public(node)
  visit_visibility(node)
end

#visit_req_param(node) ⇒ Object

: (ReqParam node) -> void



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# File 'lib/rbi/rbs_printer.rb', line 462

def visit_req_param(node)
  if @positional_names
    print("untyped #{node.name}")
  else
    print("untyped")
  end
end

#visit_requires_ancestor(node) ⇒ Object

: (RequiresAncestor node) -> void



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# File 'lib/rbi/rbs_printer.rb', line 705

def visit_requires_ancestor(node)
  # no-op, we already show them in the scope header
end

#visit_rest_param(node) ⇒ Object

: (RestParam node) -> void



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# File 'lib/rbi/rbs_printer.rb', line 482

def visit_rest_param(node)
  if @positional_names
    print("*untyped #{node.name}")
  else
    print("*untyped")
  end
end

#visit_scope(node) ⇒ Object

: (Scope node) -> void



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# File 'lib/rbi/rbs_printer.rb', line 151

def visit_scope(node)
  print_blank_line_before(node)
  print_loc(node)
  visit_all(node.comments)

  visit_scope_header(node)
  visit_scope_body(node)
end

#visit_scope_body(node) ⇒ Object

: (Scope node) -> void



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# File 'lib/rbi/rbs_printer.rb', line 214

def visit_scope_body(node)
  unless node.empty?
    indent
    visit_all(node.nodes)
    dedent
  end
  if !node.is_a?(Struct) || !node.empty?
    printl("end")
  end
end

#visit_scope_conflict(node) ⇒ Object

: (ScopeConflict node) -> void



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# File 'lib/rbi/rbs_printer.rb', line 721

def visit_scope_conflict(node)
  print_blank_line_before(node)
  print_loc(node)
  visit_all(node.comments)

  printl("<<<<<<< #{node.left_name}")
  visit_scope_header(node.left)
  printl("=======")
  visit_scope_header(node.right)
  printl(">>>>>>> #{node.right_name}")
  visit_scope_body(node.left)
end

#visit_scope_header(node) ⇒ Object

: (Scope node) -> void



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# File 'lib/rbi/rbs_printer.rb', line 161

def visit_scope_header(node)
  node.nodes.grep(Helper).each do |helper|
    visit(Comment.new("@#{helper.name}"))
  end

  mixins = node.nodes.grep(MixesInClassMethods)
  if mixins.any?
    visit(Comment.new("@mixes_in_class_methods #{mixins.map(&:names).join(", ")}"))
  end

  ancestors = node.nodes.grep(RequiresAncestor)
  if ancestors.any?
    visit(Comment.new("@requires_ancestor #{ancestors.map(&:name).join(", ")}"))
  end

  case node
  when TStruct
    printt("class #{node.name}")
  when TEnum
    printt("class #{node.name}")
  when Module
    printt("module #{node.name}")
  when Class
    printt("class #{node.name}")
    superclass = node.superclass_name
    print(" < #{superclass}") if superclass
  when Struct
    printt("#{node.name} = ::Struct.new")
    if !node.members.empty? || node.keyword_init
      print("(")
      args = node.members.map { |member| ":#{member}" }
      args << "keyword_init: true" if node.keyword_init
      print(args.join(", "))
      print(")")
    end
  when SingletonClass
    printt("class << self")
  else
    raise Error, "Unhandled node: #{node.class}"
  end

  type_params = node.nodes.grep(TypeMember)
  if type_params.any?
    print("[#{type_params.map(&:name).join(", ")}]")
  end

  if !node.empty? && node.is_a?(Struct)
    print(" do")
  end
  printn
end

#visit_send(node) ⇒ Object

: (Send node) -> void



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# File 'lib/rbi/rbs_printer.rb', line 572

def visit_send(node)
  # no-op, arbitrary sends are not supported in RBS
end

#visit_sig(node) ⇒ Object

: (Sig node) -> void



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# File 'lib/rbi/rbs_printer.rb', line 443

def visit_sig(node)
  if node.params
    print("(")
    node.params.each do |param|
      visit(param)
    end
    print(") ")
  end

  print("-> #{parse_type(node.return_type).rbs_string}")
end

#visit_sig_param(node) ⇒ Object

: (SigParam node) -> void



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# File 'lib/rbi/rbs_printer.rb', line 456

def visit_sig_param(node)
  print(parse_type(node.type).rbs_string)
end

#visit_singleton_class(node) ⇒ Object

: (SingletonClass node) -> void



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# File 'lib/rbi/rbs_printer.rb', line 146

def visit_singleton_class(node)
  visit_scope(node)
end

#visit_struct(node) ⇒ Object

: (Struct node) -> void



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# File 'lib/rbi/rbs_printer.rb', line 140

def visit_struct(node)
  visit_scope(node)
end

#visit_tenum(node) ⇒ Object

: (TEnum node) -> void



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# File 'lib/rbi/rbs_printer.rb', line 641

def visit_tenum(node)
  visit_scope(node)
end

#visit_tenum_block(node) ⇒ Object

: (TEnumBlock node) -> void



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# File 'lib/rbi/rbs_printer.rb', line 647

def visit_tenum_block(node)
  node.nodes.each do |child|
    child = if child.is_a?(Const) && child.value == "new"
      parent = node.parent_scope
      Const.new(
        child.name,
        "T.let(nil, #{parent.is_a?(TEnum) ? parent.name : "T.untyped"})",
        comments: child.comments,
      )
    else
      child
    end
    visit(child)
    @previous_node = child
  end
end

#visit_tree(node) ⇒ Object

: (Tree node) -> void



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# File 'lib/rbi/rbs_printer.rb', line 120

def visit_tree(node)
  visit_all(node.comments)
  printn if !node.comments.empty? && !node.empty?
  visit_all(node.nodes)
end

#visit_tstruct(node) ⇒ Object

: (TStruct node) -> void



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# File 'lib/rbi/rbs_printer.rb', line 590

def visit_tstruct(node)
  print_blank_line_before(node)
  print_loc(node)
  visit_all(node.comments)

  visit_scope_header(node)
  nodes = node.nodes.dup

  sig = Sig.new
  init = Method.new("initialize", sigs: [sig])
  last_field = -1
  nodes.each_with_index do |child, i|
    case child
    when TStructField
      default = child.default
      init << if default
        KwOptParam.new(child.name, default)
      else
        KwParam.new(child.name)
      end
      sig << SigParam.new(child.name, child.type)
      last_field = i
    end
  end
  nodes.insert(last_field + 1, init)

  indent
  visit_all(nodes)
  dedent

  printl("end")
end

#visit_tstruct_const(node) ⇒ Object

: (TStructConst node) -> void



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# File 'lib/rbi/rbs_printer.rb', line 625

def visit_tstruct_const(node)
  # `T::Struct.const` is not supported in RBS instead we generate an attribute reader
  accessor = AttrReader.new(node.name.to_sym, comments: node.comments, sigs: [Sig.new(return_type: node.type)])
  visit_attr_reader(accessor)
end

#visit_tstruct_prop(node) ⇒ Object

: (TStructProp node) -> void



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# File 'lib/rbi/rbs_printer.rb', line 633

def visit_tstruct_prop(node)
  # `T::Struct.prop` is not supported in RBS instead we generate an attribute accessor
  accessor = AttrAccessor.new(node.name.to_sym, comments: node.comments, sigs: [Sig.new(return_type: node.type)])
  visit_attr_accessor(accessor)
end

#visit_type_member(node) ⇒ Object

: (TypeMember node) -> void



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# File 'lib/rbi/rbs_printer.rb', line 666

def visit_type_member(node)
  # no-op, we already show them in the scope header
end

#visit_visibility(node) ⇒ Object

: (Visibility node) -> void



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# File 'lib/rbi/rbs_printer.rb', line 562

def visit_visibility(node)
  print_blank_line_before(node)
  print_loc(node)
  visit_all(node.comments)

  printl(node.visibility.to_s)
end

#visit_visibility_group(node) ⇒ Object

: (VisibilityGroup node) -> void



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# File 'lib/rbi/rbs_printer.rb', line 691

def visit_visibility_group(node)
  self.in_visibility_group = true
  if node.visibility.public?
    printn unless previous_node.nil?
  else
    visit(node.visibility)
    printn
  end
  visit_all(node.nodes)
  self.in_visibility_group = false
end