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# frozen_string_literal: true
module Emittance
module Helpers
##
# Some helpers for fetching, setting, and manipulating constants.
#
module ConstantHelpers
# Since +Object#const_set+ does not support namespaced constant names, use this to set the constant to the
# correct namespace.
#
# Example:
#
# my_const_name = 'String::Foo'
# Object.const_set my_const_name, 'bar'
# # => NameError: wrong constant name String::Foo
#
# set_namespaced_constant_by_name my_const_name, 'bar'
# String::Foo
# # => 'bar'
#
# @param const_name [String] a valid namespaced constant name
# @param obj the value you wish to set that constant to
# @return the object to which you assigned the namespaced constant
def set_namespaced_constant_by_name(const_name, obj, namespace_filler_klass = Module)
names = const_name.split('::')
names.shift if names.size > 1 && names.first.empty?
parent_names = names[0...-1]
parent_namespace_name = names[0...-1].join('::')
fill_in_namespace(parent_names, parent_namespace_name, namespace_filler_klass)
namespace = parent_names.empty? ? Object : Object.const_get(parent_namespace_name)
namespace.const_set names.last, obj
end
private
def fill_in_namespace(parent_names, parent_namespace_name, namespace_filler_klass)
set_namespaced_constant_by_name parent_namespace_name, namespace_filler_klass.new, namespace_filler_klass \
unless parent_names.empty? || Object.const_defined?(parent_namespace_name)
end
end
end
end
# class Foo
# extend Emittance::Helpers::ConstantHelpers
# end
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8 entries across 8 versions & 1 rubygems