Class: Pry::Method

Inherits:
Object show all
Extended by:
Forwardable, Helpers::BaseHelpers
Includes:
CodeObject::Helpers, Helpers::BaseHelpers, Helpers::DocumentationHelpers
Defined in:
lib/pry/method.rb,
lib/pry/method/patcher.rb,
lib/pry/method/disowned.rb,
lib/pry/method/weird_method_locator.rb

Overview

This class wraps the normal Method and UnboundMethod classes to provide extra functionality useful to Pry.

Direct Known Subclasses

Disowned

Defined Under Namespace

Classes: Disowned, Patcher, WeirdMethodLocator

Constant Summary

Constants included from Helpers::DocumentationHelpers

Helpers::DocumentationHelpers::YARD_TAGS

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Forwardable

def_private_delegators

Methods included from Helpers::BaseHelpers

colorize_code, find_command, heading, highlight, not_a_real_file?, safe_send, silence_warnings, stagger_output, use_ansi_codes?

Methods included from CodeObject::Helpers

#c_method?, #c_module?, #command?, #module_with_yard_docs?, #real_method_object?

Methods included from Helpers::DocumentationHelpers

#get_comment_content, get_comment_content, process_comment_markup, #process_comment_markup, #process_rdoc, process_rdoc, #process_yardoc, process_yardoc, process_yardoc_tag, #process_yardoc_tag, #strip_comments_from_c_code, strip_comments_from_c_code, #strip_leading_whitespace, strip_leading_whitespace

Constructor Details

#initialize(method, known_info = {}) ⇒ Pry::Method

A new instance of Pry::Method wrapping the given ::Method, UnboundMethod, or Proc.

Parameters:

  • method (::Method, UnboundMethod, Proc)
  • known_info (Hash) (defaults to: {}) —

    Can be used to pre-cache expensive to compute stuff.


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# File 'lib/pry/method.rb', line 263

def initialize(method, known_info = {})
  @method = method
  @visibility = known_info[:visibility]
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method_name, *args, &block) ⇒ Object

Delegate any unknown calls to the wrapped method.


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# File 'lib/pry/method.rb', line 503

def method_missing(method_name, *args, &block)
  if @method.respond_to?(method_name)
    @method.__send__(method_name, *args, &block)
  else
    super
  end
end

Class Method Details

.all_from_class(klass, include_super = true) ⇒ Array[Pry::Method]

Get all of the instance methods of a Class or Module

Parameters:

  • klass (Class, Module)
  • include_super (Boolean) (defaults to: true) —

    Whether to include methods from ancestors.

Returns:


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# File 'lib/pry/method.rb', line 161

def all_from_class(klass, include_super = true)
  %w[public protected private].flat_map do |visibility|
    safe_send(
      klass, :"#{visibility}_instance_methods", include_super
    ).map do |method_name|
      new(
        safe_send(klass, :instance_method, method_name),
        visibility: visibility.to_sym
      )
    end
  end
end

.all_from_obj(obj, include_super = true) ⇒ Array[Pry::Method]

Get all of the methods on an Object

Parameters:

  • obj (Object)
  • include_super (Boolean) (defaults to: true) —

    indicates whether or not to include methods from ancestors.

Returns:


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# File 'lib/pry/method.rb', line 184

def all_from_obj(obj, include_super = true)
  all_from_class(singleton_class_of(obj), include_super)
end

.from_binding(binding) ⇒ Pry::Method?

Given a Binding, try to extract the ::Method it originated from and use it to instantiate a Pry::Method. Return nil if this isn't possible.

Parameters:

  • binding (Binding)

Returns:


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# File 'lib/pry/method.rb', line 77

def from_binding(binding)
  meth_name = binding.eval('::Kernel.__method__')
  if [:__script__, nil].include?(meth_name)
    nil
  else
    method =
      begin
        if Object === binding.eval('self') # rubocop:disable Style/CaseEquality
          new(
            Kernel.instance_method(:method)
              .bind(binding.eval("self"))
              .call(meth_name)
          )
        else
          str = 'class << self; self; end' \
                '.instance_method(::Kernel.__method__).bind(self)'
          new(binding.eval(str))
        end
      rescue NameError, NoMethodError # rubocop:disable Lint/ShadowedException
        Disowned.new(binding.eval('self'), meth_name.to_s)
      end

    if WeirdMethodLocator.weird_method?(method, binding)
      WeirdMethodLocator.new(method, binding).find_method || method
    else
      method
    end
  end
end

.from_class(klass, name, target = TOPLEVEL_BINDING) ⇒ Pry::Method? Also known as: from_module

Given a Class or Module and the name of a method, try to instantiate a Pry::Method containing the instance method of that name. Return nil if no such method exists.

Parameters:

  • klass (Class, Module)
  • name (String)
  • target (Binding) (defaults to: TOPLEVEL_BINDING) —

    The binding where the method is looked up.

Returns:


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# File 'lib/pry/method.rb', line 136

def from_class(klass, name, target = TOPLEVEL_BINDING)
  new(lookup_method_via_binding(klass, name, :instance_method, target))
rescue StandardError
  nil
end

.from_obj(obj, name, target = TOPLEVEL_BINDING) ⇒ Pry::Method?

Given an object and the name of a method, try to instantiate a Pry::Method containing the method of that name bound to that object. Return nil if no such method exists.

Parameters:

  • obj (Object)
  • name (String)
  • target (Binding) (defaults to: TOPLEVEL_BINDING) —

    The binding where the method is looked up.

Returns:


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# File 'lib/pry/method.rb', line 151

def from_obj(obj, name, target = TOPLEVEL_BINDING)
  new(lookup_method_via_binding(obj, name, :method, target))
rescue StandardError
  nil
end

.from_str(name, target = TOPLEVEL_BINDING, options = {}) ⇒ Pry::Method?

Given a string representing a method name and optionally a binding to search in, find and return the requested method wrapped in a Pry::Method instance.

Parameters:

  • name (String) —

    The name of the method to retrieve.

  • target (Binding) (defaults to: TOPLEVEL_BINDING) —

    The context in which to search for the method.

  • options (Hash) (defaults to: {})

Options Hash (options):

  • :instance (Boolean) —

    Look for an instance method if name doesn't contain any context.

  • :methods (Boolean) —

    Look for a bound/singleton method if name doesn't contain any context.

Returns:

  • (Pry::Method, nil) —

    A Pry::Method instance containing the requested method, or nil if name is nil or no method could be located matching the parameters.


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# File 'lib/pry/method.rb', line 43

def from_str(name, target = TOPLEVEL_BINDING, options = {})
  if name.nil?
    nil
  elsif name.to_s =~ /(.+)\#(\S+)\Z/
    context = Regexp.last_match(1)
    meth_name = Regexp.last_match(2)
    from_module(target.eval(context), meth_name, target)
  elsif name.to_s =~ /(.+)(\[\])\Z/
    context = Regexp.last_match(1)
    meth_name = Regexp.last_match(2)
    from_obj(target.eval(context), meth_name, target)
  elsif name.to_s =~ /(.+)(\.|::)(\S+)\Z/
    context = Regexp.last_match(1)
    meth_name = Regexp.last_match(3)
    from_obj(target.eval(context), meth_name, target)
  elsif options[:instance]
    from_module(target.eval("self"), name, target)
  elsif options[:methods]
    from_obj(target.eval("self"), name, target)
  else
    from_str(name, target, instance: true) ||
      from_str(name, target, methods: true)
  end
rescue Pry::RescuableException
  nil
end

.instance_method_definition?(name, definition_line) ⇒ Boolean

Returns:

  • (Boolean) 

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# File 'lib/pry/method.rb', line 227

def instance_method_definition?(name, definition_line)
  regexp =
    /^define_method\(?\s*[:\"\']#{Regexp.escape(name)}|
     ^def\s*#{Regexp.escape(name)}/x
  regexp =~ definition_line.strip
end

.instance_resolution_order(klass) ⇒ Array[Class, Module]

Get every Class and Module, in order, that will be checked when looking for methods on instances of the given Class or Module. This does not treat singleton classes of classes specially.

Parameters:

  • klass (Class, Module)

Returns:

  • (Array[Class, Module]) 

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# File 'lib/pry/method.rb', line 210

def instance_resolution_order(klass)
  # include klass in case it is a singleton class,
  ([klass] + Pry::Method.safe_send(klass, :ancestors)).uniq
end

.lookup_method_via_binding(obj, method_name, method_type, target = TOPLEVEL_BINDING) ⇒ Method, UnboundMethod

In order to support 2.0 Refinements we need to look up methods inside the relevant Binding.

Parameters:

  • obj (Object) —

    The owner/receiver of the method.

  • method_name (Symbol) —

    The name of the method.

  • method_type (Symbol) —

    The type of method: :method or :instance_method

  • target (Binding) (defaults to: TOPLEVEL_BINDING) —

    The binding where the method is looked up.

Returns:

  • (Method, UnboundMethod) —

    The 'refined' method object.


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# File 'lib/pry/method.rb', line 114

def lookup_method_via_binding(
  obj, method_name, method_type, target = TOPLEVEL_BINDING
)
  Pry.current[:obj] = obj
  Pry.current[:name] = method_name
  receiver = obj.is_a?(Module) ? "Module" : "Kernel"
  target.eval(
    "::#{receiver}.instance_method(:#{method_type})" \
    ".bind(Pry.current[:obj]).call(Pry.current[:name])"
  )
ensure
  Pry.current[:obj] = Pry.current[:name] = nil
end

.method_definition?(name, definition_line) ⇒ Boolean

Returns:

  • (Boolean) 

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# File 'lib/pry/method.rb', line 215

def method_definition?(name, definition_line)
  singleton_method_definition?(name, definition_line) ||
    instance_method_definition?(name, definition_line)
end

.resolution_order(obj) ⇒ Array[Class, Module]

Get every Class and Module, in order, that will be checked when looking for an instance method to call on this object.

Parameters:

Returns:

  • (Array[Class, Module]) 

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# File 'lib/pry/method.rb', line 192

def resolution_order(obj)
  if Class === obj # rubocop:disable Style/CaseEquality
    singleton_class_resolution_order(obj) + instance_resolution_order(Class)
  else
    klass = begin
              singleton_class_of(obj)
            rescue StandardError
              obj.class
            end
    instance_resolution_order(klass)
  end
end

.singleton_class_of(obj) ⇒ Object 


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# File 'lib/pry/method.rb', line 247

def singleton_class_of(obj)
  class << obj; self; end
rescue TypeError # can't define singleton. Fixnum, Symbol, Float, ...
  obj.class
end

.singleton_class_resolution_order(klass) ⇒ Object

Get the singleton classes of superclasses that could define methods on the given class object, and any modules they include. If a module is included at multiple points in the ancestry, only the lowest copy will be returned.


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# File 'lib/pry/method.rb', line 238

def singleton_class_resolution_order(klass)
  ancestors = Pry::Method.safe_send(klass, :ancestors)
  resolution_order = ancestors.grep(Class).flat_map do |anc|
    [singleton_class_of(anc), *singleton_class_of(anc).included_modules]
  end

  resolution_order.reverse.uniq.reverse - Class.included_modules
end

.singleton_method_definition?(name, definition_line) ⇒ Boolean

Returns:

  • (Boolean) 

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# File 'lib/pry/method.rb', line 220

def singleton_method_definition?(name, definition_line)
  regexp =
    /^define_singleton_method\(?\s*[:\"\']#{Regexp.escape(name)}|
     ^def\s*self\.#{Regexp.escape(name)}/x
  regexp =~ definition_line.strip
end

Instance Method Details

#==(other) ⇒ Boolean

Returns:

  • (Boolean) 

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# File 'lib/pry/method.rb', line 483

def ==(other)
  return other == @method if other.is_a?(Pry::Method)

  @method == other
end

#alias? ⇒ Boolean

Returns Is the method definitely an alias?.

Returns:

  • (Boolean) —

    Is the method definitely an alias?


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# File 'lib/pry/method.rb', line 478

def alias?
  name != original_name
end

#aliases ⇒ Array<String>

Returns All known aliases for the method.

Returns:

  • (Array<String>) —

    All known aliases for the method.


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# File 'lib/pry/method.rb', line 461

def aliases
  owner = @method.owner
  # Avoid using `to_sym` on {Method#name}, which returns a `String`, because
  # it won't be garbage collected.
  name = @method.name

  all_methods_to_compare = owner.instance_methods | owner.private_instance_methods
  alias_list = all_methods_to_compare.combination(2).select do |pair|
    pair.include?(name) &&
      owner.instance_method(pair.first) == owner.instance_method(pair.last)
  end.flatten
  alias_list.delete(name)

  alias_list.map(&:to_s)
end

#bound_method? ⇒ Boolean

Returns Whether the method is bound.

Returns:

  • (Boolean) —

    Whether the method is bound.


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# File 'lib/pry/method.rb', line 446

def bound_method?
  is_a?(::Method)
end

#c_source ⇒ Object (private) 


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# File 'lib/pry/method.rb', line 577

def c_source
  info = pry_doc_info
  strip_comments_from_c_code(info.source) if info && info.source
end

#comment ⇒ Object 


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# File 'lib/pry/method.rb', line 515

def comment
  Pry::Code.from_file(source_file).comment_describing(source_line)
end

#doc ⇒ String?

Returns The documentation for the method, or nil if it's unavailable.

Returns:

  • (String, nil) —

    The documentation for the method, or nil if it's unavailable.


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# File 'lib/pry/method.rb', line 329

def doc
  @doc ||=
    case source_type
    when :c
      info = pry_doc_info
      info.docstring if info
    when :ruby
      get_comment_content(comment)
    end
end

#dynamically_defined? ⇒ Boolean

Returns Was the method defined outside a source file?.

Returns:

  • (Boolean) —

    Was the method defined outside a source file?


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# File 'lib/pry/method.rb', line 436

def dynamically_defined?
  !!(source_file && source_file =~ /(\(.*\))|<.*>/)
end

#is_a?(klass) ⇒ Boolean Also known as: kind_of?

Parameters:

  • klass (Class)

Returns:

  • (Boolean) 

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# File 'lib/pry/method.rb', line 491

def is_a?(klass)
  (klass == Pry::Method) || @method.is_a?(klass)
end

#method_name_from_first_line(first_ln) ⇒ String? (private)

Parameters:

  • first_ln (String) —

    The first line of a method definition.

Returns:

  • (String, nil) 

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# File 'lib/pry/method.rb', line 563

def method_name_from_first_line(first_ln)
  return nil if first_ln.strip !~ /^def /

  tokens = SyntaxHighlighter.tokenize(first_ln)
  tokens = tokens.tokens.each_slice(2) if tokens.respond_to?(:tokens)
  tokens.each_cons(2) do |t1, t2|
    if t2.last == :method || t2.last == :ident && t1 == [".", :operator]
      return t2.first
    end
  end

  nil
end

#name ⇒ String

Get the name of the method as a String, regardless of the underlying Method#name type.

Returns:

  • (String) 

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# File 'lib/pry/method.rb', line 272

def name
  @method.name.to_s
end

#name_with_owner ⇒ String

Get the name of the method including the class on which it was defined.

Examples:

method(:puts).method_name
=> "Kernel.puts"

Returns:

  • (String) 

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# File 'lib/pry/method.rb', line 299

def name_with_owner
  "#{wrapped_owner.method_prefix}#{name}"
end

#original_name ⇒ String?

Returns The original name the method was defined under, before any aliasing, or nil if it can't be determined.

Returns:

  • (String, nil) —

    The original name the method was defined under, before any aliasing, or nil if it can't be determined.


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# File 'lib/pry/method.rb', line 429

def original_name
  return nil if source_type != :ruby

  method_name_from_first_line(source.lines.first)
end

#pry_doc_info ⇒ YARD::CodeObjects::MethodObject (private)

Returns:

  • (YARD::CodeObjects::MethodObject)

Raises:

  • (CommandError) —

    when the method can't be found or pry-doc isn't installed.


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# File 'lib/pry/method.rb', line 523

def pry_doc_info
  if defined?(PryDoc)
    Pry::MethodInfo.info_for(@method) ||
      raise(
        CommandError,
        "Cannot locate this method: #{name}. (source_location returns nil)"
      )
  else
    fail_msg = "Cannot locate this method: #{name}."
    if Helpers::Platform.mri?
      fail_msg += " Invoke the 'gem-install pry-doc' Pry command to get " \
                  "access to Ruby Core documentation.\n"
    end
    raise CommandError, fail_msg
  end
end

#pry_method? ⇒ Boolean

Returns Was the method defined within the Pry REPL?.

Returns:

  • (Boolean) —

    Was the method defined within the Pry REPL?


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# File 'lib/pry/method.rb', line 456

def pry_method?
  source_file == Pry.eval_path
end

#redefine(source) ⇒ Object

Update the live copy of the method's source.


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# File 'lib/pry/method.rb', line 314

def redefine(source)
  Patcher.new(self).patch_in_ram source
  Pry::Method(owner.instance_method(name))
end

#respond_to?(method_name, include_all = false) ⇒ Boolean

Parameters:

  • method_name (String, Symbol)

Returns:

  • (Boolean) 

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# File 'lib/pry/method.rb', line 498

def respond_to?(method_name, include_all = false)
  super || @method.respond_to?(method_name, include_all)
end

#respond_to_missing?(method_name, include_private = false) ⇒ Boolean

Returns:

  • (Boolean) 

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# File 'lib/pry/method.rb', line 511

def respond_to_missing?(method_name, include_private = false)
  @method.respond_to?(method_name) || super
end

#ruby_source ⇒ Object (private) 


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# File 'lib/pry/method.rb', line 582

def ruby_source
  # Clone of `MethodSource.source_helper` that knows to use our
  # hacked version of `source_location` for our input buffer for methods
  # defined in `(pry)`.
  file, line = *source_location
  unless file
    raise SourceNotFoundError, "Could not locate source for #{name_with_owner}!"
  end

  begin
    code = Pry::Code.from_file(file).expression_at(line)
  rescue SyntaxError => e
    raise MethodSource::SourceNotFoundError, e.message
  end
  strip_leading_whitespace(code)
end

#signature ⇒ String

Returns A representation of the method's signature, including its name and parameters. Optional and "rest" parameters are marked with * and block parameters with &. Keyword arguments are shown with : If the parameter names are unavailable, they're given numbered names instead. Paraphrased from awesome_print gem.

Returns:

  • (String) —

    A representation of the method's signature, including its name and parameters. Optional and "rest" parameters are marked with * and block parameters with &. Keyword arguments are shown with : If the parameter names are unavailable, they're given numbered names instead. Paraphrased from awesome_print gem.


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# File 'lib/pry/method.rb', line 391

def signature
  if respond_to?(:parameters)
    args = parameters.inject([]) do |args_array, (arg_type, name)|
      name ||= (arg_type == :block ? 'block' : "arg#{args_array.size + 1}")
      args_array.push(
        case arg_type
        when :req    then name.to_s
        when :opt    then "#{name}=?"
        when :rest   then "*#{name}"
        when :block  then "&#{name}"
        when :key    then "#{name}:?"
        when :keyreq then "#{name}:"
        else '?'
        end
      )
    end
  else
    args = (1..arity.abs).map { |i| "arg#{i}" }
    args[-1] = "*#{args[-1]}" if arity < 0
  end

  "#{name}(#{args.join(', ')})"
end

#singleton_method? ⇒ Boolean

Returns Whether the method is a singleton method.

Returns:

  • (Boolean) —

    Whether the method is a singleton method.


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# File 'lib/pry/method.rb', line 451

def singleton_method?
  wrapped_owner.singleton_class?
end

#source ⇒ String?

Returns The source code of the method, or nil if it's unavailable.

Returns:

  • (String, nil) —

    The source code of the method, or nil if it's unavailable.


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# File 'lib/pry/method.rb', line 304

def source
  @source ||= case source_type
              when :c
                c_source
              when :ruby
                ruby_source
              end
end

#source? ⇒ Boolean

Can we get the source code for this method?

Returns:

  • (Boolean) 

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# File 'lib/pry/method.rb', line 321

def source?
  !!source
rescue MethodSource::SourceNotFoundError
  false
end

#source_file ⇒ String?

Returns The name of the file the method is defined in, or nil if the filename is unavailable.

Returns:

  • (String, nil) —

    The name of the file the method is defined in, or nil if the filename is unavailable.


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# File 'lib/pry/method.rb', line 348

def source_file
  if source_location.nil?
    if source_type == :c
      info = pry_doc_info
      info.file if info
    end
  else
    source_location.first
  end
end

#source_line ⇒ Fixnum?

Returns The line of code in source_file which begins the method's definition, or nil if that information is unavailable.

Returns:

  • (Fixnum, nil) —

    The line of code in source_file which begins the method's definition, or nil if that information is unavailable.


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# File 'lib/pry/method.rb', line 361

def source_line
  source_location.nil? ? nil : source_location.last
end

#source_range ⇒ Range?

Returns The range of lines in source_file which contain the method's definition, or nil if that information is unavailable.

Returns:

  • (Range, nil) —

    The range of lines in source_file which contain the method's definition, or nil if that information is unavailable.


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# File 'lib/pry/method.rb', line 367

def source_range
  source_location.nil? ? nil : (source_line)..(source_line + source.lines.count - 1)
end

#source_type ⇒ Symbol

Returns The source type of the method. The options are :ruby for Ruby methods or :c for methods written in C.

Returns:

  • (Symbol) —

    The source type of the method. The options are :ruby for Ruby methods or :c for methods written in C.


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# File 'lib/pry/method.rb', line 342

def source_type
  source_location.nil? ? :c : :ruby
end

#super(times = 1) ⇒ Pry::Method?

Returns The wrapped method that is called when you use "super" in the body of this method.

Returns:

  • (Pry::Method, nil) —

    The wrapped method that is called when you use "super" in the body of this method.


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# File 'lib/pry/method.rb', line 417

def super(times = 1)
  if @method.is_a?(UnboundMethod)
    sup = super_using_ancestors(Pry::Method.instance_resolution_order(owner), times)
  else
    sup = super_using_ancestors(Pry::Method.resolution_order(receiver), times)
    sup &&= sup.bind(receiver)
  end
  Pry::Method.new(sup) if sup
end

#super_using_ancestors(ancestors, times = 1) ⇒ Method (private)

Returns The unwrapped super-method.

Parameters:

  • ancestors (Class, Module) —

    The ancestors to investigate

Returns:

  • (Method) —

    The unwrapped super-method


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# File 'lib/pry/method.rb', line 542

def super_using_ancestors(ancestors, times = 1)
  next_owner = owner
  times.times do
    i = ancestors.index(next_owner) + 1
    while ancestors[i] &&
          !(ancestors[i].method_defined?(name) ||
            ancestors[i].private_method_defined?(name))
      i += 1
    end
    (next_owner = ancestors[i]) || (return nil)
  end

  begin
    safe_send(next_owner, :instance_method, name)
  rescue StandardError
    nil
  end
end

#unbound_method? ⇒ Boolean

Returns Whether the method is unbound.

Returns:

  • (Boolean) —

    Whether the method is unbound.


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# File 'lib/pry/method.rb', line 441

def unbound_method?
  is_a?(::UnboundMethod)
end

#undefined? ⇒ Boolean

Is the method undefined? (aka Disowned)

Returns:

  • (Boolean) —

    false


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# File 'lib/pry/method.rb', line 290

def undefined?
  false
end

#visibility ⇒ Symbol

Returns The visibility of the method. May be :public, :protected, or :private.

Returns:

  • (Symbol) —

    The visibility of the method. May be :public, :protected, or :private.


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# File 'lib/pry/method.rb', line 373

def visibility
  @visibility ||=
    if owner.public_instance_methods.any? { |m| m.to_s == name }
      :public
    elsif owner.protected_instance_methods.any? { |m| m.to_s == name }
      :protected
    elsif owner.private_instance_methods.any? { |m| m.to_s == name }
      :private
    else
      :none
    end
end

#wrapped ⇒ Method, ...

Get underlying object wrapped by this Pry::Method instance

Returns:

  • (Method, UnboundMethod, Proc) 

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# File 'lib/pry/method.rb', line 284

def wrapped
  @method
end

#wrapped_owner ⇒ Pry::Module

Get the owner of the method as a Pry::Module

Returns:

  • (Pry::Module) 

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# File 'lib/pry/method.rb', line 278

def wrapped_owner
  @wrapped_owner ||= Pry::WrappedModule.new(owner)
end