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Contents
module MethodInfo
# Utility class to filter a list of ancestors, taking the class/module hierarchy into account
class AncestorFilter
# A list of the ancestors that were picked by the filter
attr_reader :picked
# Creates an AncestorFilter and performs a filtering based on the options passed.
# ==== Parameters
#
# * <tt>:include</tt> - An ancestor that is in this list and the original ancestor list will always be included, regardless of the value of :exclude.
# * <tt>:exclude</tt> - A list of ancestors that are to be excluded from the original list. If a class is excluded, all modules included under it are excluded as well.
def initialize(ancestors, options = {})
@ancestors = ancestors
filter(options)
end
# Perform another filter operation on the same list of ancestors. See initialize for supported
# options.
def filter(options = {})
@options = options
@exclude = @options[:exclude] || []
@include = @options[:include] || []
@picked =
@ancestors -
(@exclude - included_ancestors) -
(modules_under_excluded_classes - included_ancestors)
end
# A list of the ancestors that were excluded by the filter
def excluded
@ancestors - @picked
end
private
def included_ancestors
@ancestors & @include
end
def modules_under_excluded_classes
group_ancestors_by_class
@ancestors.select { |ancestor| ancestor.is_a?(Class) && @exclude.include?(ancestor) }.
map { |klass| @class_module_map[klass] }.flatten
end
def group_ancestors_by_class
@class_module_map = Hash.new
@last_class = nil
@class_module_map[nil] = []
@ancestors.each do |ancestor|
if ancestor.is_a?(Class)
@class_module_map[ancestor] = []
@last_class = ancestor
else
@class_module_map[@last_class] << ancestor
end
end
end
end
end
Version data entries
10 entries across 10 versions & 1 rubygems