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# frozen_string_literal: true
require "clamp/attribute/definition"
module Clamp
module Parameter
# Represents an parameter of a Clamp::Command class.
#
class Definition < Attribute::Definition
def initialize(name, description, options = {})
@name = name
@description = description
super(options)
@multivalued = (@name =~ ELLIPSIS_SUFFIX)
@required = options.fetch(:required) do
(@name !~ OPTIONAL)
end
@inheritable = options.fetch(:inheritable, true)
end
attr_reader :name
def inheritable?
@inheritable
end
def help_lhs
name
end
def consume(arguments)
raise ArgumentError, Clamp.message(:no_value_provided) if required? && arguments.empty?
arguments.shift(multivalued? ? arguments.length : 1)
end
ELLIPSIS_SUFFIX = / \.\.\.$/.freeze
OPTIONAL = /^\[(.*)\]/.freeze
VALID_ATTRIBUTE_NAME = /^[a-z0-9_]+$/.freeze
private
def infer_attribute_name
inferred_name = name.downcase.tr("-", "_").sub(ELLIPSIS_SUFFIX, "").sub(OPTIONAL) { Regexp.last_match(1) }
raise "cannot infer attribute_name from #{name.inspect}" unless inferred_name.match? VALID_ATTRIBUTE_NAME
inferred_name += "_list" if multivalued?
inferred_name
end
def required_indicator
# implied by LHS
end
end
end
end
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