Class: Steep::Drivers::Scaffold::Generator

Inherits:
Object
  • Object
show all
Defined in:
lib/steep/drivers/scaffold.rb

Defined Under Namespace

Classes: Module

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(source:, stderr:) ⇒ Generator

Returns a new instance of Generator.



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# File 'lib/steep/drivers/scaffold.rb', line 61

def initialize(source:, stderr:)
  @source = source
  @stderr = stderr
  @modules = []
  @constants = {}
end

Instance Attribute Details

#constants ⇒ Object (readonly)

Returns the value of attribute constants.



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# File 'lib/steep/drivers/scaffold.rb', line 58

def constants
  @constants
end

#modules ⇒ Object (readonly)

Returns the value of attribute modules.



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# File 'lib/steep/drivers/scaffold.rb', line 57

def modules
  @modules
end

#source ⇒ Object (readonly)

Returns the value of attribute source.



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# File 'lib/steep/drivers/scaffold.rb', line 56

def source
  @source
end

#stderr ⇒ Object (readonly)

Returns the value of attribute stderr.



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# File 'lib/steep/drivers/scaffold.rb', line 59

def stderr
  @stderr
end

Instance Method Details

#arg_types(args) ⇒ Object 



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# File 'lib/steep/drivers/scaffold.rb', line 296

def arg_types(args)
  args.children.map do |arg|
    case arg.type
    when :arg
      "any"
    when :optarg
      "?#{guess_type(arg.children[1])}"
    when :restarg
      "*any"
    when :kwarg
      "#{arg.children.first.name}: any"
    when :kwoptarg
      "?#{arg.children.first.name}: #{guess_type(arg.children[1])}"
    when :kwrestarg
      "**any"
    end
  end.compact.join(", ")
end

#each_child_node(node, &block) ⇒ Object 



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# File 'lib/steep/drivers/scaffold.rb', line 288

def each_child_node(node, &block)
  node.children.each do |child|
    if child.is_a?(::AST::Node)
      yield child
    end
  end
end

#full_name(current_path, name) ⇒ Object 



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# File 'lib/steep/drivers/scaffold.rb', line 111

def full_name(current_path, name)
  (current_path + [name]).join("::")
end

#generate(node, current_path:, current_module: nil, is_instance_method: false) ⇒ Object 



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# File 'lib/steep/drivers/scaffold.rb', line 115

def generate(node, current_path:, current_module: nil, is_instance_method: false)
  case node.type
  when :module
    name = module_name(node.children[0])
    mod = Module.new(name: full_name(current_path, name), kind: :module)
    modules << mod

    if node.children[1]
      generate(node.children[1],
               current_path: current_path + [name],
               current_module: mod)
    end

    if current_module
      current_module.has_subclass = true
    end

  when :class
    name = module_name(node.children[0])
    klass = Module.new(name: full_name(current_path, name), kind: :class)
    modules << klass

    if node.children[2]
      generate(node.children[2],
               current_path: current_path + [name],
               current_module: klass)
    end

    if current_module
      current_module.has_subclass = true
    end

  when :def
    name, args, body = node.children

    if current_module
      current_module.methods[name] = "(#{arg_types(args)}) -> #{guess_type(body)}"
    end

    if body
      generate(body,
               current_path: current_path,
               current_module: current_module,
               is_instance_method: true)
    end

  when :ivar, :ivasgn
    name = node.children[0]

    if current_module && is_instance_method
      current_module.ivars[name] = guess_type(node.children[1])
    end

    each_child_node(node) do |child|
      generate(child,
               current_path: current_path,
               current_module: current_module,
               is_instance_method: is_instance_method)
    end

  when :defs
    if node.children[0].type == :self
      _, name, args, body = node.children

      if current_module
        current_module.singleton_methods[name] = "(#{arg_types(args)}) -> #{guess_type(body)}"
      end

      if body
        generate(body,
                 current_path: current_path,
                 current_module: current_module,
                 is_instance_method: false)
      end
    end

  when :casgn
    if node.children[0]
      stderr.puts "Unexpected casgn: #{node}, #{node.loc.line}"
    end

    constants[full_name(current_path, node.children[1])] = guess_type(node.children[2])

    if node.children[2]
      generate(node.children[2],
               current_path: current_path,
               current_module: current_module,
               is_instance_method: is_instance_method)
    end

  else
    each_child_node(node) do |child|
      generate(child, current_path: current_path, current_module: current_module, is_instance_method: is_instance_method)
    end
  end
end

#guess_type(node) ⇒ Object 



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# File 'lib/steep/drivers/scaffold.rb', line 212

def guess_type(node)
  return "any" unless node
  case node.type
  when :false, :true
    "_Boolean"
  when :int
    "Integer"
  when :float
    "Float"
  when :complex
    "Complex"
  when :rational
    "Rational"
  when :str, :dstr, :xstr
    "String"
  when :sym, :dsym
    "Symbol"
  when :regexp
    "Regexp"
  when :array
    "Array<any>"
  when :hash
    "Hash<any, any>"
  when :irange, :erange
    "Range<any>"
  when :lvasgn, :ivasgn, :cvasgn, :gvasgn, :casgn
    guess_type(node.children.last)
  when :send
    if node.children[1] == :[]=
      guess_type(node.children.last)
    else
      "any"
    end
  when :begin
    # should support shortcut return?
    guess_type(node.children.last)
  when :return
    children = node.children
    if children.size == 1
      guess_type(node.children.last)
    else
      "Array<any>" # or Tuple or any?
    end
  when :if
    children = node.children
    if children[2]
      ty1 = guess_type(children[1])
      ty2 = guess_type(children[2])
      if ty1 == ty2
        ty1
      else
        "any"
      end
    else
      "void" # assuming no-else if statement implies void
    end
  when :while, :until, :while_post, :until_post, :for
    "void"
  when :case
    children = node.children
    if children.last
      ty = guess_type(children.last)
      children[1..-2].each do |child|
        return "any" if ty != guess_type(child.children.last)
      end
      ty
    else
      "any"
    end
  when :masgn
    "void" # assuming masgn implies void
  else
    "any"
  end
end

#module_name(name) ⇒ Object 



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# File 'lib/steep/drivers/scaffold.rb', line 97

def module_name(name)
  if name.type == :const
    prefix = name.children[0]
    if prefix
      "#{module_name(prefix)}::#{name.children[1]}"
    else
      name.children[1].to_s
    end
  else
    stderr.puts "Unexpected node for class name: #{name}"
    return "____"
  end
end

#write(io:) ⇒ Object 



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# File 'lib/steep/drivers/scaffold.rb', line 68

def write(io:)
  generate(source.node, current_path: [])

  modules.each do |mod|
    unless mod.namespace_class?
      io.puts "#{mod.kind} #{mod.name}"

      mod.ivars.each do |name, type|
        io.puts "  #{name}: #{type}"
      end

      mod.methods.each do |name, type|
        io.puts "  def #{name}: #{type}"
      end

      mod.singleton_methods.each do |name, type|
        io.puts "  def self.#{name}: #{type}"
      end

      io.puts "end"
      io.puts
    end
  end

  constants.each do |name, ty|
    io.puts "#{name}: #{ty}"
  end
end