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|
# ----------------------------------------------------------------------------
# Frozen-string-literal: true
# Copyright: 2015-2016 Jordon Bedwell - MIT License
# Encoding: utf-8
# ----------------------------------------------------------------------------
require "forwardable/extended/version"
require "forwardable"
module Forwardable
module Extended
# ------------------------------------------------------------------------
# Make our methods private on the class, there is no reason for public.
# ------------------------------------------------------------------------
def self.extended(klass)
instance_methods.each do |method|
klass.private_class_method(
method
)
end
end
# ------------------------------------------------------------------------
# Delegate using a Rails-like interface.
# ------------------------------------------------------------------------
def rb_delegate(method, to: nil, alias_of: method, **kwd)
raise ArgumentError, "to must be provided" unless to
def_delegator(
to, alias_of, method, **kwd
)
end
# ------------------------------------------------------------------------
# Delegate a method to a hash and key.
# ------------------------------------------------------------------------
def def_hash_delegator(hash, method, key: method, **kwd)
prefix, suffix, wrap = prepare_delegate(**kwd)
if suffix
method = method.to_s.gsub(
/\?$/, ""
)
end
class_eval delegate_debug(<<-STR), __FILE__, __LINE__ - 9
def #{method}#{suffix}(*args)
#{wrap}(
#{prefix}#{hash}[#{key.inspect}]
)
rescue Exception
if !Forwardable.debug && $@ && $@.respond_to?(:delete_if)
$@.delete_if do |source|
source =~ %r"#{Regexp.escape(__FILE__)}"o
end
end
raise
end
STR
end
# ------------------------------------------------------------------------
# Delegate a method to an instance variable.
# ------------------------------------------------------------------------
def def_ivar_delegator(ivar, alias_ = ivar, **kwd)
prefix, suffix, wrap = prepare_delegate(**kwd)
if suffix
alias_ = alias_.to_s.gsub(
/\?$/, ""
)
end
class_eval delegate_debug(<<-STR), __FILE__, __LINE__ - 9
def #{alias_.to_s.gsub(/\A@/, "")}#{suffix}
#{wrap}(
#{prefix}#{ivar}
)
rescue Exception
if !Forwardable.debug && $@ && $@.respond_to?(:delete_if)
$@.delete_if do |source|
source =~ %r"#{Regexp.escape(__FILE__)}"o
end
end
raise
end
STR
end
# ------------------------------------------------------------------------
# Like def_delegator but allows you to send args and do other stuff.
# ------------------------------------------------------------------------
def def_modern_delegator(accessor, method, alias_ = method, args: \
{ :before => [], :after => [] }, **kwd)
prefix, suffix, wrap = prepare_delegate(**kwd)
args = { :before => args } unless args.is_a?(Hash)
b = [args[:before]].flatten.compact.map(&:to_s).join(", ")
a = [args[ :after]].flatten.compact.map(&:to_s).join(", ")
b = b + ", " unless args[:before].nil? || args[:before].empty?
a = ", " + a unless args[ :after].nil? || args[ :after].empty?
alias_ = alias_.to_s.gsub(/\?$/, "") if suffix
class_eval delegate_debug(<<-STR), __FILE__, __LINE__ - 10
def #{alias_}#{suffix}(*args, &block)
#{wrap}(#{prefix}#{accessor}.send(
#{method.inspect}, #{b}*args#{a}, &block
))
rescue Exception
if !Forwardable.debug && $@ && $@.respond_to?(:delete_if)
$@.delete_if do |source|
source =~ %r"#{Regexp.escape(__FILE__)}"o
end
end
raise
end
STR
end
# ------------------------------------------------------------------------
# Wraps around traditional delegation and modern delegation.
# ------------------------------------------------------------------------
def def_delegator(accessor, method, alias_ = method, **kwd)
kwd, alias_ = alias_, method if alias_.is_a?(Hash) && !kwd.any?
if alias_.is_a?(Hash) || !kwd.any?
Forwardable.instance_method(:def_delegator).bind(self) \
.call(accessor, method, alias_)
elsif !kwd[:type]
def_modern_delegator(
accessor, method, alias_, **kwd
)
else
raise ArgumentError, "Alias not supported." if alias_ != method
send("def_#{kwd[:type]}_delegator", accessor, method, **kwd.tap do |obj|
obj.delete(:type)
end)
end
end
# ------------------------------------------------------------------------
# Create multiple delegates at once.
# ------------------------------------------------------------------------
def def_delegators(accessor, *methods)
kwd = methods.shift if methods.first.is_a?(Hash)
kwd = methods.pop if methods. last.is_a?(Hash)
kwd = {} unless kwd
methods.each do |method|
def_delegator accessor, method, **kwd
end
end
# ------------------------------------------------------------------------
# Prepares a delegate and it's few arguments.
# ------------------------------------------------------------------------
private
def prepare_delegate(wrap: nil, bool: false)
prefix = (bool == :reverse ? "!!!" : "!!") if bool
wrap = "self.class.new" if wrap.is_a?(TrueClass)
suffix = "?" if bool
return [
prefix, suffix, wrap
]
end
# ------------------------------------------------------------------------
private
def delegate_debug(str)
if Forwardable.debug && !Forwardable.debug.is_a?(TrueClass)
then Forwardable.debug.debug(
str
)
elsif Forwardable.debug
$stdout.puts(
"\n# ------\n\n", str
)
end
str
end
end
end
|
