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# frozen_string_literal: true
module Gitlab
module Ci
module Variables
class Collection
class Sort
include TSort
include Gitlab::Utils::StrongMemoize
def initialize(collection)
raise(ArgumentError, "A Gitlab::Ci::Variables::Collection object was expected") unless
collection.is_a?(Collection)
@collection = collection
end
def valid?
errors.nil?
end
# errors sorts an array of variables, ignoring unknown variable references,
# and returning an error string if a circular variable reference is found
def errors
strong_memoize(:errors) do
# Check for cyclic dependencies and build error message in that case
cyclic_vars = each_strongly_connected_component.filter_map do |component|
component.map { |v| v[:key] }.inspect if component.size > 1
end
"circular variable reference detected: #{cyclic_vars.join(', ')}" if cyclic_vars.any?
end
end
private
def tsort_each_node(&block)
@collection.each(&block)
end
def tsort_each_child(var_item, &block)
depends_on = var_item.depends_on
return unless depends_on
depends_on.filter_map { |var_ref_name| @collection[var_ref_name] }.each(&block)
end
end
end
end
end
end
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