module Rake
class TaskArguments
include Enumerable
attr_reader :names
def initialize(names, values, parent=nil)
@names = names
@parent = parent
@hash = {}
names.each_with_index { |name, i|
@hash[name.to_sym] = values[i] unless values[i].nil?
}
end
def new_scope(names)
values = names.collect { |n| self[n] }
self.class.new(names, values, self)
end
def [](index)
lookup(index.to_sym)
end
def with_defaults(defaults)
@hash = defaults.merge(@hash)
end
def each(&block)
@hash.each(&block)
end
def values_at(*keys)
keys.map { |k| lookup(k) }
end
def method_missing(sym, *args)
lookup(sym.to_sym)
end
def to_hash
@hash
end
def to_s
@hash.inspect
end
def inspect
to_s
end
protected
def lookup(name)
if @hash.has_key?(name)
@hash[name]
elsif @parent
@parent.lookup(name)
end
end
end
EMPTY_TASK_ARGS = TaskArguments.new([], [])
end