mirror of
https://github.com/pry/pry.git
synced 2022-11-09 12:35:05 -05:00
515 lines
18 KiB
Ruby
515 lines
18 KiB
Ruby
# -*- coding: utf-8 -*-
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class Pry
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class << self
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# If the given object is a `Pry::Method`, return it unaltered. If it's
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# anything else, return it wrapped in a `Pry::Method` instance.
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def Method(obj)
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if obj.is_a? Pry::Method
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obj
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else
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Pry::Method.new(obj)
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end
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end
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end
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class Method
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include RbxMethod if Helpers::BaseHelpers.rbx?
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class << self
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# Given a string representing a method name and optionally a binding to
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# search in, find and return the requested method wrapped in a `Pry::Method`
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# instance.
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#
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# @param [String, nil] name The name of the method to retrieve, or `nil` to
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# delegate to `from_binding` instead.
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# @param [Binding] target The context in which to search for the method.
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# @param [Hash] options
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# @option options [Boolean] :instance Look for an instance method if `name` doesn't
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# contain any context.
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# @option options [Boolean] :methods Look for a bound/singleton method if `name` doesn't
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# contain any context.
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# @return [Pry::Method, nil] A `Pry::Method` instance containing the requested
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# method, or `nil` if no method could be located matching the parameters.
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def from_str(name, target=TOPLEVEL_BINDING, options={})
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if name.nil?
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from_binding(target)
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elsif name.to_s =~ /(.+)\#(\S+)\Z/
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context, meth_name = $1, $2
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from_module(target.eval(context), meth_name)
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elsif name.to_s =~ /(.+)\.(\S+)\Z/
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context, meth_name = $1, $2
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from_obj(target.eval(context), meth_name)
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elsif options[:instance]
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from_module(target.eval("self"), name)
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elsif options[:methods]
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from_obj(target.eval("self"), name)
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else
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from_str(name, target, :instance => true) or
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from_str(name, target, :methods => true)
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end
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end
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# Given a `Binding`, try to extract the `::Method` it originated from and
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# use it to instantiate a `Pry::Method`. Return `nil` if this isn't
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# possible.
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#
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# @param [Binding] b
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# @return [Pry::Method, nil]
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#
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def from_binding(b)
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meth_name = b.eval('__method__')
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if [:__script__, nil, :__binding__, :__binding_impl__].include?(meth_name)
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nil
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else
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method = begin
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new(b.eval("method(#{meth_name.to_s.inspect})"))
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rescue NameError, NoMethodError
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Disowned.new(b.eval('self'), meth_name.to_s)
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end
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# it's possible in some cases that the method we find by this approach is a sub-method of
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# the one we're currently in, consider:
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#
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# class A; def b; binding.pry; end; end
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# class B < A; def b; super; end; end
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#
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# Given that we can normally find the source_range of methods, and that we know which
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# __FILE__ and __LINE__ the binding is at, we can hope to disambiguate these cases.
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#
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# This obviously won't work if the source is unavaiable for some reason, or if both
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# methods have the same __FILE__ and __LINE__, or if we're in rbx where b.eval('__LINE__')
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# is broken.
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#
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guess = method
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while guess
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# needs rescue if this is a Disowned method or a C method or something...
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# TODO: Fix up the exception handling so we don't need a bare rescue
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if (guess.source_file && guess.source_range rescue false) &&
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File.expand_path(guess.source_file) == File.expand_path(b.eval('__FILE__')) &&
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guess.source_range.include?(b.eval('__LINE__'))
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return guess
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else
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guess = guess.super
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end
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end
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# Uhoh... none of the methods in the chain had the right __FILE__ and __LINE__
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# This may be caused by rbx https://github.com/rubinius/rubinius/issues/953,
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# or other unknown circumstances (TODO: we should warn the user when this happens)
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method
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end
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end
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# Given a `Class` or `Module` and the name of a method, try to
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# instantiate a `Pry::Method` containing the instance method of
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# that name. Return `nil` if no such method exists.
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#
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# @param [Class, Module] klass
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# @param [String] name
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# @return [Pry::Method, nil]
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def from_class(klass, name)
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new(klass.instance_method(name)) rescue nil
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end
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alias from_module from_class
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# Given an object and the name of a method, try to instantiate
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# a `Pry::Method` containing the method of that name bound to
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# that object. Return `nil` if no such method exists.
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#
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# @param [Object] obj
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# @param [String] name
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# @return [Pry::Method, nil]
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def from_obj(obj, name)
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new(obj.method(name)) rescue nil
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end
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# Get all of the instance methods of a `Class` or `Module`
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# @param [Class,Module] klass
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# @return [Array[Pry::Method]]
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def all_from_class(klass)
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all_from_common(klass, :instance_method)
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end
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# Get all of the methods on an `Object`
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# @param [Object] obj
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# @return [Array[Pry::Method]]
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def all_from_obj(obj)
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all_from_common(obj, :method)
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end
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# Get every `Class` and `Module`, in order, that will be checked when looking
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# for an instance method to call on this object.
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# @param [Object] obj
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# @return [Array[Class, Module]]
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def resolution_order(obj)
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if Class === obj
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singleton_class_resolution_order(obj) + instance_resolution_order(Class)
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else
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klass = singleton_class(obj) rescue obj.class
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instance_resolution_order(klass)
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end
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end
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# Get every `Class` and `Module`, in order, that will be checked when looking
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# for methods on instances of the given `Class` or `Module`.
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# This does not treat singleton classes of classes specially.
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# @param [Class, Module] klass
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# @return [Array[Class, Module]]
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def instance_resolution_order(klass)
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# include klass in case it is a singleton class,
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([klass] + klass.ancestors).uniq
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end
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private
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# See all_from_class and all_from_obj.
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# If method_type is :instance_method, obj must be a `Class` or a `Module`
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# If method_type is :method, obj can be any `Object`
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#
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# N.B. we pre-cache the visibility here to avoid O(N²) behaviour in "ls".
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def all_from_common(obj, method_type)
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%w(public protected private).map do |visibility|
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safe_send(obj, :"#{visibility}_#{method_type}s").map do |method_name|
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new(safe_send(obj, method_type, method_name), :visibility => visibility.to_sym)
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end
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end.flatten(1)
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end
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# Acts like send but ignores any methods defined below Object or Class in the
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# inheritance hierarchy.
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# This is required to introspect methods on objects like Net::HTTP::Get that
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# have overridden the `method` method.
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def safe_send(obj, method, *args, &block)
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(Module === obj ? Module : Object).instance_method(method).bind(obj).call(*args, &block)
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end
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# Get the singleton classes of superclasses that could define methods on
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# the given class object, and any modules they include.
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# If a module is included at multiple points in the ancestry, only
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# the lowest copy will be returned.
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def singleton_class_resolution_order(klass)
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resolution_order = klass.ancestors.map do |anc|
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[singleton_class(anc)] + singleton_class(anc).included_modules if anc.is_a?(Class)
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end.compact.flatten(1)
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resolution_order.reverse.uniq.reverse - Class.included_modules
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end
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def singleton_class(obj); class << obj; self; end end
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end
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# A new instance of `Pry::Method` wrapping the given `::Method`, `UnboundMethod`, or `Proc`.
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#
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# @param [::Method, UnboundMethod, Proc] method
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# @param [Hash] known_info, can be used to pre-cache expensive to compute stuff.
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# @return [Pry::Method]
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def initialize(method, known_info={})
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@method = method
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@visibility = known_info[:visibility]
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end
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# Get the name of the method as a String, regardless of the underlying Method#name type.
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# @return [String]
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def name
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@method.name.to_s
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end
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# Get the owner of the method as a Pry::Module
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# @return [Pry::Module]
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def wrapped_owner
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@wrapped_owner ||= Pry::WrappedModule.new(owner)
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end
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# Is the method undefined? (aka `Disowned`)
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# @return [Boolean] false
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def undefined?
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false
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end
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# Get the name of the method including the class on which it was defined.
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# @example
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# method(:puts).method_name
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# => "Kernel.puts"
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# @return [String]
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def name_with_owner
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"#{wrapped_owner.method_prefix}#{name}"
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end
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# @return [String, nil] The source code of the method, or `nil` if it's unavailable.
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def source
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@source ||= case source_type
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when :c
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info = pry_doc_info
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if info and info.source
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code = strip_comments_from_c_code(info.source)
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end
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when :ruby
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if Helpers::BaseHelpers.rbx? && core?
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code = core_code
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elsif pry_method?
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code = Pry.new(:input => StringIO.new(Pry.line_buffer[source_line..-1].join), :prompt => proc {""}, :hooks => Pry::Hooks.new).r
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else
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code = @method.source
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end
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strip_leading_whitespace(code)
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end
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end
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# @return [String, nil] The documentation for the method, or `nil` if it's
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# unavailable.
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# @raise [CommandError] Raises when the method was defined in the REPL.
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def doc
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@doc ||= case source_type
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when :c
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info = pry_doc_info
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info.docstring if info
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when :ruby
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if Helpers::BaseHelpers.rbx? && core?
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strip_leading_hash_and_whitespace_from_ruby_comments(core_doc)
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elsif pry_method?
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raise CommandError, "Can't view doc for a REPL-defined method."
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else
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strip_leading_hash_and_whitespace_from_ruby_comments(@method.comment)
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end
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end
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end
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# @return [Symbol] The source type of the method. The options are
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# `:ruby` for Ruby methods or `:c` for methods written in C.
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def source_type
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source_location.nil? ? :c : :ruby
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end
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# @return [String, nil] The name of the file the method is defined in, or
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# `nil` if the filename is unavailable.
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def source_file
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if source_location.nil?
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if !Helpers::BaseHelpers.rbx? and source_type == :c
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info = pry_doc_info
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info.file if info
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end
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else
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source_location.first
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end
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end
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# @return [Fixnum, nil] The line of code in `source_file` which begins
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# the method's definition, or `nil` if that information is unavailable.
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def source_line
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source_location.nil? ? nil : source_location.last
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end
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# @return [Range, nil] The range of lines in `source_file` which contain
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# the method's definition, or `nil` if that information is unavailable.
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def source_range
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source_location.nil? ? nil : (source_line)...(source_line + source.lines.count)
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end
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# @return [Symbol] The visibility of the method. May be `:public`,
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# `:protected`, or `:private`.
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def visibility
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@visibility ||= if owner.public_instance_methods.any? { |m| m.to_s == name }
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:public
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elsif owner.protected_instance_methods.any? { |m| m.to_s == name }
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:protected
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elsif owner.private_instance_methods.any? { |m| m.to_s == name }
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:private
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else
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:none
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end
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end
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# @return [String] A representation of the method's signature, including its
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# name and parameters. Optional and "rest" parameters are marked with `*`
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# and block parameters with `&`. If the parameter names are unavailable,
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# they're given numbered names instead.
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# Paraphrased from `awesome_print` gem.
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def signature
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if respond_to?(:parameters)
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args = parameters.inject([]) do |arr, (type, name)|
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name ||= (type == :block ? 'block' : "arg#{arr.size + 1}")
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arr << case type
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when :req then name.to_s
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when :opt then "#{name}=?"
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when :rest then "*#{name}"
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when :block then "&#{name}"
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else '?'
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end
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end
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else
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args = (1..arity.abs).map { |i| "arg#{i}" }
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args[-1] = "*#{args[-1]}" if arity < 0
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end
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"#{name}(#{args.join(', ')})"
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end
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# @return [Pry::Method, nil] The wrapped method that is called when you
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# use "super" in the body of this method.
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def super(times=1)
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if UnboundMethod === @method
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sup = super_using_ancestors(Pry::Method.instance_resolution_order(owner), times)
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else
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sup = super_using_ancestors(Pry::Method.resolution_order(receiver), times)
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sup &&= sup.bind(receiver)
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end
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Pry::Method.new(sup) if sup
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end
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# @return [String, nil] The original name the method was defined under,
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# before any aliasing, or `nil` if it can't be determined.
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def original_name
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return nil if source_type != :ruby
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method_name_from_first_line(source.lines.first)
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end
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# @return [Boolean] Was the method defined outside a source file?
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def dynamically_defined?
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!!(source_file and source_file =~ /(\(.*\))|<.*>/)
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end
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# @return [Boolean] Was the method defined within the Pry REPL?
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def pry_method?
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source_file == Pry.eval_path
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end
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# @return [Boolean] Is the method definitely an alias?
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def alias?
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name != original_name
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end
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# @return [Boolean]
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def ==(obj)
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if obj.is_a? Pry::Method
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super
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else
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@method == obj
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end
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end
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# @param [Class] klass
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# @return [Boolean]
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def is_a?(klass)
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klass == Pry::Method or @method.is_a?(klass)
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end
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alias kind_of? is_a?
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# @param [String, Symbol] method_name
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# @return [Boolean]
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def respond_to?(method_name)
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super or @method.respond_to?(method_name)
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end
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# Delegate any unknown calls to the wrapped method.
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def method_missing(method_name, *args, &block)
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@method.send(method_name, *args, &block)
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end
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private
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# @return [YARD::CodeObjects::MethodObject]
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# @raise [CommandError] Raises when the method can't be found or `pry-doc` isn't installed.
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def pry_doc_info
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if Pry.config.has_pry_doc
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Pry::MethodInfo.info_for(@method) or raise CommandError, "Cannot locate this method: #{name}."
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else
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raise CommandError, "Cannot locate this method: #{name}. Try `gem install pry-doc` to get access to Ruby Core documentation."
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end
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end
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# @param [String] code
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# @return [String]
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def strip_comments_from_c_code(code)
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code.sub(/\A\s*\/\*.*?\*\/\s*/m, '')
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end
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# @param [String] comment
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# @return [String]
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def strip_leading_hash_and_whitespace_from_ruby_comments(comment)
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comment = comment.dup
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comment.gsub!(/\A\#+?$/, '')
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comment.gsub!(/^\s*#/, '')
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strip_leading_whitespace(comment)
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end
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# @param [String] text
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# @return [String]
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def strip_leading_whitespace(text)
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Pry::Helpers::CommandHelpers.unindent(text)
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end
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# @param [Class,Module] the ancestors to investigate
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# @return [Method] the unwrapped super-method
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def super_using_ancestors(ancestors, times=1)
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next_owner = self.owner
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times.times do
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i = ancestors.index(next_owner) + 1
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while ancestors[i] && !(ancestors[i].method_defined?(name) || ancestors[i].private_method_defined?(name))
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i += 1
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end
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next_owner = ancestors[i] or return nil
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end
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next_owner.instance_method(name) rescue nil
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end
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# @param [String] first_ln The first line of a method definition.
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# @return [String, nil]
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def method_name_from_first_line(first_ln)
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return nil if first_ln.strip !~ /^def /
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tokens = CodeRay.scan(first_ln, :ruby)
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tokens = tokens.tokens.each_slice(2) if tokens.respond_to?(:tokens)
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tokens.each_cons(2) do |t1, t2|
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if t2.last == :method || t2.last == :ident && t1 == [".", :operator]
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return t2.first
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end
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end
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nil
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end
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# A Disowned Method is one that's been removed from the class on which it was defined.
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#
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# e.g.
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# class C
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# def foo
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# C.send(:undefine_method, :foo)
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# Pry::Method.from_binding(binding)
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# end
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# end
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#
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# In this case we assume that the "owner" is the singleton class of the receiver.
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#
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# This occurs mainly in Sinatra applications.
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class Disowned < Method
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attr_reader :receiver, :name
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# Create a new Disowned method.
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#
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# @param [Object] receiver
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# @param [String] method_name
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def initialize(*args)
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@receiver, @name = *args
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end
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# Is the method undefined? (aka `Disowned`)
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# @return [Boolean] true
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def undefined?
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true
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end
|
|
|
|
# Get the hypothesized owner of the method.
|
|
#
|
|
# @return [Object]
|
|
def owner
|
|
class << receiver; self; end
|
|
end
|
|
|
|
# Raise a more useful error message instead of trying to forward to nil.
|
|
def method_missing(meth_name, *args, &block)
|
|
raise "Cannot call '#{meth_name}' on an undef'd method." if method(:name).respond_to?(meth_name)
|
|
Object.instance_method(:method_missing).bind(self).call(meth_name, *args, &block)
|
|
end
|
|
end
|
|
end
|
|
end
|