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# frozen_string_literal: true
require "forwardable"
module TTY
class Prompt
# Immutable collection of converters for type transformation
#
# @api private
class ConverterRegistry
extend Forwardable
def_delegators "@__registry", :keys
# Create a registry of conversions
#
# @param [Hash] registry
#
# @api private
def initialize(registry = {})
@__registry = registry.dup
end
# Check if conversion is available
#
# @param [String] name
#
# @return [Boolean]
#
# @api public
def contain?(name)
conv_name = name.to_s.downcase.to_sym
@__registry.key?(conv_name)
end
# Register a conversion
#
# @param [Symbol] name
# the converter name
#
# @api public
def register(*names, &block)
names.each do |name|
if contain?(name)
raise ConversionAlreadyDefined,
"converter for #{name.inspect} is already registered"
end
@__registry[name] = block
end
end
# Execute converter
#
# @api public
def [](name)
conv_name = name.to_s.downcase.to_sym
@__registry.fetch(conv_name) do
raise UnsupportedConversion,
"converter #{conv_name.inspect} is not registered"
end
end
alias fetch []
def inspect
@_registry.inspect
end
end # ConverterRegistry
end # Prompt
end # TTY
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