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Contents
module Builderator
module Config
##
# Extend Array with context about how its values should be merged with other
# configuration layers. Possible modes are:
#
# * 'override' - Do not merge. Replace the other node's elements
# * 'union' - Perform a set-union on the elements of this and the other node
##
class List < Array
class << self
def coerce(somehting, options = {})
return somehting if somehting.is_a?(self)
return new(options).push(*somehting) if somehting.is_a?(Array)
## `somehting` is not a valid input. Just give back an instance.
new([], options)
end
end
attr_reader :mode
def initialize(from = nil, **options)
@mode = options.fetch(:mode, :union)
merge!(from) unless from.nil?
end
def clone
self.class.new(self, :mode => mode)
end
def set(*elements)
clear
push(*elements)
end
##
# Combine elements with `other` according to `other`'s `mode`
##
def merge!(other)
other = self.class.coerce(other)
case other.mode
when :override
return false if self == other
set(*other)
when :union
merged = self | other
return false if merged == self
set(*merged)
else
fail "Invalid List mode #{other.mode}!"
end
true
end
end
end
end
Version data entries
34 entries across 34 versions & 1 rubygems