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Diffstat (limited to 'lib/rake/scope.rb')
-rw-r--r-- | lib/rake/scope.rb | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/lib/rake/scope.rb b/lib/rake/scope.rb new file mode 100644 index 0000000000..33e1c08e7b --- /dev/null +++ b/lib/rake/scope.rb @@ -0,0 +1,42 @@ +module Rake + class Scope < LinkedList + + # Path for the scope. + def path + map { |item| item.to_s }.reverse.join(":") + end + + # Path for the scope + the named path. + def path_with_task_name(task_name) + "#{path}:#{task_name}" + end + + # Trim +n+ innermost scope levels from the scope. In no case will + # this trim beyond the toplevel scope. + def trim(n) + result = self + while n > 0 && ! result.empty? + result = result.tail + n -= 1 + end + result + end + + # Scope lists always end with an EmptyScope object. See Null + # Object Pattern) + class EmptyScope < EmptyLinkedList + @parent = Scope + + def path + "" + end + + def path_with_task_name(task_name) + task_name + end + end + + # Singleton null object for an empty scope. + EMPTY = EmptyScope.new + end +end |