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require "instantiator/version"
require "instantiator/core_ext"
require "blankslate"
module Instantiator
UNSUPPORTED_NAMESPACES = %w(Introspection OptionParser::Switch URI Net).freeze
UNSUPPORTED_CLASSES = %w(Introspection OptionParser::Switch Gem::Installer Gem::Package::TarInput Zlib::GzipReader Zlib::GzipWriter Zlib::GzipFile Zlib::ZStream Bundler::Dependency Bundler::Definition Digest::Base Binding UnboundMethod Method Proc Process::Status Dir File::Stat MatchData Struct Bignum Float Fixnum Integer Continuation Thread NameError::message SignalException FalseClass TrueClass Data Symbol NilClass Socket UNIXServer UNIXSocket TCPServer TCPSocket UDPSocket IPSocket BasicSocket Trying).freeze
UNSUPPORTED_REGEX = Regexp.new((UNSUPPORTED_NAMESPACES.map { |ns| "^#{ns}::" } + UNSUPPORTED_CLASSES.map { |c| "^#{c}$" }).join("|")).freeze
def self.unsupported_class?(klass)
klass.to_s[UNSUPPORTED_REGEX]
end
class Error < StandardError; end
class MethodInvocationSink < ::BlankSlate
def method_missing(method_name, *args, &block)
MethodInvocationSink.new
end
def to_str
String.new
end
def to_int
Integer(0)
end
def to_ary
Array.new
end
def to_hash
Hash.new
end
end
module ClassMethods
def instantiate
if Instantiator.unsupported_class?(self)
raise Error.new("#{self}.instantiate is not yet supported")
end
if singleton_methods(false).map(&:to_sym).include?(:new)
arity = method(:new).arity
else
arity = instance_method(:initialize).arity
end
numbers_of_parameters = arity >= 0 ? [arity] : (-(arity + 1)..5-(arity + 1)).to_a
instance = nil
numbers_of_parameters.each do |number_of_parameters|
begin
instance = new(*Array.new(number_of_parameters) { MethodInvocationSink.new })
return instance if instance
rescue ArgumentError => e
end
end
raise Error.new("Unable to instantiate #{self}")
end
end
end
class Class
include Instantiator::ClassMethods
end
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