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require 'active_support/core_ext/string/inflections'
#--
# Allows code reuse in the methods below without polluting Module.
#++
module QualifiedConstUtils
def self.raise_if_absolute(path)
raise NameError.new("wrong constant name #$&") if path =~ /\A::[^:]+/
end
def self.names(path)
path.split('::')
end
end
##
# Extends the API for constants to be able to deal with qualified names. Arguments
# are assumed to be relative to the receiver.
#
#--
# Qualified names are required to be relative because we are extending existing
# methods that expect constant names, ie, relative paths of length 1. For example,
# Object.const_get('::String') raises NameError and so does qualified_const_get.
#++
class Module
def qualified_const_defined?(path, search_parents=true)
QualifiedConstUtils.raise_if_absolute(path)
QualifiedConstUtils.names(path).inject(self) do |mod, name|
return unless mod.const_defined?(name, search_parents)
mod.const_get(name)
end
return true
end
def qualified_const_get(path)
QualifiedConstUtils.raise_if_absolute(path)
QualifiedConstUtils.names(path).inject(self) do |mod, name|
mod.const_get(name)
end
end
def qualified_const_set(path, value)
QualifiedConstUtils.raise_if_absolute(path)
const_name = path.demodulize
mod_name = path.deconstantize
mod = mod_name.empty? ? self : qualified_const_get(mod_name)
mod.const_set(const_name, value)
end
end
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