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Contents
# frozen_string_literal: true
module Nanoc::Int
# Holds a value that might be generated lazily.
#
# @api private
class LazyValue
include Nanoc::Int::ContractsSupport
# @param [Object, Proc] value_or_proc A value or a proc to generate the value
def initialize(value_or_proc)
@value = { raw: value_or_proc }
end
# @return [Object] The value, generated when needed
def value
if @value.key?(:raw)
value = @value.delete(:raw)
@value[:final] = value.respond_to?(:call) ? value.call : value
@value.__nanoc_freeze_recursively if frozen?
end
@value[:final]
end
contract C::Func[C::Any => C::Any] => self
# Returns a new lazy value that will apply the given transformation when the value is requested.
#
# @yield resolved value
#
# @return [Nanoc::Int::LazyValue]
def map
Nanoc::Int::LazyValue.new(-> { yield(value) })
end
contract C::None => self
# @return [void]
def freeze
super
@value.__nanoc_freeze_recursively unless @value[:raw]
self
end
end
end
Version data entries
41 entries across 41 versions & 1 rubygems