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# MultiMatch allows multiple values to be tested at once in a case expression.
# This class is needed since Array does not implement the === operator to mean
# "each v === other.each v".
#
# This class is useful in situations when the Puppet Type System cannot be used
# (e.g. in Logging, since it needs to be able to log very early in the initialization
# cycle of puppet)
#
# Typically used with the constants
# NOT_NIL
# TUPLE
# TRIPLE
#
# which test against single NOT_NIL value, Array with two NOT_NIL, and Array with three NOT_NIL
#
module Puppet::Util
class MultiMatch
attr_reader :values
def initialize(*values)
@values = values
end
def ===(other)
lv = @values # local var is faster than instance var
case other
when MultiMatch
return false unless other.values.size == values.size
other.values.each_with_index {|v, i| return false unless lv[i] === v || v === lv[i]}
when Array
return false unless other.size == values.size
other.each_with_index {|v, i| return false unless lv[i] === v || v === lv[i]}
else
false
end
true
end
# Matches any value that is not nil using the === operator.
#
class MatchNotNil
def ===(v)
!v.nil?
end
end
NOT_NIL = MatchNotNil.new().freeze
TUPLE = MultiMatch.new(NOT_NIL, NOT_NIL).freeze
TRIPLE = MultiMatch.new(NOT_NIL, NOT_NIL, NOT_NIL).freeze
end
end
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