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# frozen_string_literal: true
module Liquid
class Registers
attr_reader :static
def initialize(registers = {})
@static = registers.is_a?(Registers) ? registers.static : registers
@changes = {}
end
def []=(key, value)
@changes[key] = value
end
def [](key)
if @changes.key?(key)
@changes[key]
else
@static[key]
end
end
def delete(key)
@changes.delete(key)
end
UNDEFINED = Object.new
def keys
(@static.keys + @changes.keys).uniq
end
def each(&block)
keys.each do |key|
yield(key, fetch(key))
end
end
def fetch(key, default = UNDEFINED, &block)
if @changes.key?(key)
@changes.fetch(key)
elsif default != UNDEFINED
if block_given?
@static.fetch(key, &block)
else
@static.fetch(key, default)
end
else
@static.fetch(key, &block)
end
end
def key?(key)
@changes.key?(key) || @static.key?(key)
end
end
# Alias for backwards compatibility
StaticRegisters = Registers
end
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