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Versions: 14
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Contents
class Surrogate
# Superclass for all types of values. Where a value is anything stored
# in an instance variable on a surrogate, intended to be returned by an api method
class Value
# convert raw arguments into a value
def self.factory(*args, &block)
arg = args.first
if args.size > 1
ValueQueue.new args
elsif arg.kind_of? Exception
Raisable.new arg
elsif arg.kind_of? BaseValue
arg
else
BaseValue.new arg
end
end
# === the current set of possible values ===
class BaseValue
def initialize(value)
@value = value
end
def value(method_name)
@value
end
def factory(*args, &block)
Value.factory(*args, &block)
end
end
class Raisable < BaseValue
def value(*)
raise @value
end
end
class ValueQueue < BaseValue
QueueEmpty = Class.new SurrogateError
def value(method_name)
if empty?
raise QueueEmpty
else
factory(dequeue).value(method_name)
end
end
def queue
@value
end
def dequeue
raise QueueEmpty if empty?
queue.shift
end
def empty?
queue.empty?
end
end
end
end
Version data entries
14 entries across 14 versions & 1 rubygems