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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
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