Class: RBS::Writer

Inherits:
Object
  • Object
show all
Defined in:
lib/rbs/writer.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(out:) ⇒ Writer

Returns a new instance of Writer.



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# File 'lib/rbs/writer.rb', line 6

def initialize(out:)
  @out = out
  @indentation = []
end

Instance Attribute Details

#indentation ⇒ Object (readonly)

Returns the value of attribute indentation.



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# File 'lib/rbs/writer.rb', line 4

def indentation
  @indentation
end

#out ⇒ Object (readonly)

Returns the value of attribute out.



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# File 'lib/rbs/writer.rb', line 3

def out
  @out
end

Instance Method Details

#attribute(kind, attr) ⇒ Object 



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# File 'lib/rbs/writer.rb', line 284

def attribute(kind, attr)
  var = case attr.ivar_name
        when nil
          ""
        when false
          "()"
        else
          "(#{attr.ivar_name})"
        end

  receiver = case attr.kind
             when :singleton
               "self."
             when :instance
               ""
             end

  "attr_#{kind} #{receiver}#{attr.name}#{var}: #{attr.type}"
end

#indent(size = 2) ⇒ Object 



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# File 'lib/rbs/writer.rb', line 11

def indent(size = 2)
  indentation.push(" " * size)
  yield
ensure
  indentation.pop
end

#method_name(name) ⇒ Object 



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# File 'lib/rbs/writer.rb', line 232

def method_name(name)
  s = name.to_s

  case s
  when /\A(_?)[A-Za-z_]\w*(\?|!|=)?\Z/
    s
  when *%w(|  ^  &  <=>  ==  ===  =~  >   >=  <   <=   <<  >> +  -  *  /  %   **   ~   +@  -@  []  []=  ` ! != !~)
    s
  else
    "`#{s}`"
  end
end

#name_and_args(name, args) ⇒ Object 



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# File 'lib/rbs/writer.rb', line 168

def name_and_args(name, args)
  if name && args
    if args.empty?
      "#{name}"
    else
      "#{name}[#{args.join(", ")}]"
    end
  end
end

#name_and_params(name, params) ⇒ Object 



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# File 'lib/rbs/writer.rb', line 144

def name_and_params(name, params)
  if params.empty?
    "#{name}"
  else
    ps = params.each.map do |param|
      s = ""
      if param.skip_validation
        s << "unchecked "
      end
      case param.variance
      when :invariant
        # nop
      when :covariant
        s << "out "
      when :contravariant
        s << "in "
      end
      s + param.name.to_s
    end

    "#{name}[#{ps.join(", ")}]"
  end
end

#prefix ⇒ Object 



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# File 'lib/rbs/writer.rb', line 18

def prefix
  indentation.join()
end

#preserve_empty_line(prev, decl) ⇒ Object 



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# File 'lib/rbs/writer.rb', line 304

def preserve_empty_line(prev, decl)
  # @type var decl: _Located

  return unless prev

  if (_ = decl).respond_to?(:comment)
    if comment = (_ = decl).comment
      decl = comment
    end
  end

  prev_loc = prev.location
  decl_loc = decl.location

  if prev_loc && decl_loc
    prev_end_line = prev_loc.end_line
    start_line = decl_loc.start_line

    if start_line - prev_end_line > 1
      puts
    end
  else
    # When the signature is not constructed by the parser,
    # it always inserts an empty line.
    puts
  end
end

#puts(string = "") ⇒ Object 



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# File 'lib/rbs/writer.rb', line 22

def puts(string = "")
  if string.size > 0
    @out.puts("#{prefix}#{string}")
  else
    @out.puts
  end
end

#write(decls) ⇒ Object 



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# File 'lib/rbs/writer.rb', line 61

def write(decls)
  [nil, *decls].each_cons(2) do |prev, decl|
    raise unless decl

    preserve_empty_line(prev, decl)
    write_decl decl
  end
end

#write_annotation(annotations) ⇒ Object 



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# File 'lib/rbs/writer.rb', line 30

def write_annotation(annotations)
  annotations.each do |annotation|
    string = annotation.string
    case
    when string !~ /\}/
      puts "%a{#{string}}"
    when string !~ /\)/
      puts "%a(#{string})"
    when string !~ /\]/
      puts "%a[#{string}]"
    when string !~ /\>/
      puts "%a<#{string}>"
    when string !~ /\|/
      puts "%a|#{string}|"
    end
  end
end

#write_comment(comment) ⇒ Object 



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# File 'lib/rbs/writer.rb', line 48

def write_comment(comment)
  if comment
    comment.string.lines.each do |line|
      line = line.chomp
      unless line.empty?
        puts "# #{line}"
      else
        puts "#"
      end
    end
  end
end

#write_decl(decl) ⇒ Object 



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# File 'lib/rbs/writer.rb', line 70

def write_decl(decl)
  case decl
  when AST::Declarations::Class
    super_class = if super_class = decl.super_class
                    " < #{name_and_args(super_class.name, super_class.args)}"
                  end
    write_comment decl.comment
    write_annotation decl.annotations
    puts "class #{name_and_params(decl.name, decl.type_params)}#{super_class}"

    indent do
      [nil, *decl.members].each_cons(2) do |prev, member|
        raise unless member

        preserve_empty_line prev, member
        write_member member
      end
    end

    puts "end"

  when AST::Declarations::Module
    self_type = unless decl.self_types.empty?
                  " : #{decl.self_types.join(", ")}"
                end

    write_comment decl.comment
    write_annotation decl.annotations

    puts "module #{name_and_params(decl.name, decl.type_params)}#{self_type}"

    indent do
      decl.members.each.with_index do |member, index|
        if index > 0
          puts
        end
        write_member member
      end
    end

    puts "end"
  when AST::Declarations::Constant
    write_comment decl.comment
    puts "#{decl.name}: #{decl.type}"

  when AST::Declarations::Global
    write_comment decl.comment
    puts "#{decl.name}: #{decl.type}"

  when AST::Declarations::Alias
    write_comment decl.comment
    write_annotation decl.annotations
    puts "type #{decl.name} = #{decl.type}"

  when AST::Declarations::Interface
    write_comment decl.comment
    write_annotation decl.annotations

    puts "interface #{name_and_params(decl.name, decl.type_params)}"

    indent do
      decl.members.each.with_index do |member, index|
        if index > 0
          puts
        end
        write_member member
      end
    end

    puts "end"

  end
end

#write_def(member) ⇒ Object 



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# File 'lib/rbs/writer.rb', line 245

def write_def(member)
  name = case member.kind
         when :instance
           "#{method_name(member.name)}"
         when :singleton_instance
           "self?.#{method_name(member.name)}"
         when :singleton
           "self.#{method_name(member.name)}"
         end

  string = ""

  prefix = "def #{name}:"
  padding = " " * (prefix.size-1)

  string << prefix

  member.types.each.with_index do |type, index|
    if index > 0
      string << padding
      string << "|"
    end

    string << " #{type}\n"
  end

  if member.overload
    if member.types.size > 0
      string << padding
      string << "|"
    end
    string << " ...\n"
  end

  string.each_line do |line|
    puts line.chomp
  end
end

#write_member(member) ⇒ Object 



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# File 'lib/rbs/writer.rb', line 178

def write_member(member)
  case member
  when AST::Members::Include
    write_comment member.comment
    write_annotation member.annotations
    puts "include #{name_and_args(member.name, member.args)}"
  when AST::Members::Extend
    write_comment member.comment
    write_annotation member.annotations
    puts "extend #{name_and_args(member.name, member.args)}"
  when AST::Members::Prepend
    write_comment member.comment
    write_annotation member.annotations
    puts "prepend #{name_and_args(member.name, member.args)}"
  when AST::Members::AttrAccessor
    write_comment member.comment
    write_annotation member.annotations
    puts "#{attribute(:accessor, member)}"
  when AST::Members::AttrReader
    write_comment member.comment
    write_annotation member.annotations
    puts "#{attribute(:reader, member)}"
  when AST::Members::AttrWriter
    write_comment member.comment
    write_annotation member.annotations
    puts "#{attribute(:writer, member)}"
  when AST::Members::Public
    puts "public"
  when AST::Members::Private
    puts "private"
  when AST::Members::Alias
    write_comment member.comment
    write_annotation member.annotations
    new_name = member.singleton? ? "self.#{member.new_name}" : member.new_name
    old_name = member.singleton? ? "self.#{member.old_name}" : member.old_name
    puts "alias #{new_name} #{old_name}"
  when AST::Members::InstanceVariable
    write_comment member.comment
    puts "#{member.name}: #{member.type}"
  when AST::Members::ClassInstanceVariable
    write_comment member.comment
    puts "self.#{member.name}: #{member.type}"
  when AST::Members::ClassVariable
    write_comment member.comment
    puts "#{member.name}: #{member.type}"
  when AST::Members::MethodDefinition
    write_comment member.comment
    write_annotation member.annotations
    write_def member
  else
    write_decl member
  end
end