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|
require "clamp/attribute/definition"
module Clamp
module Parameter
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
private
ELLIPSIS_SUFFIX = / \.\.\.$/
OPTIONAL = /^\[(.*)\]/
VALID_ATTRIBUTE_NAME = /^[a-z0-9_]+$/
def infer_attribute_name
inferred_name = name.downcase.tr("-", "_").sub(ELLIPSIS_SUFFIX, "").sub(OPTIONAL) { Regexp.last_match(1) }
unless inferred_name =~ VALID_ATTRIBUTE_NAME
raise "cannot infer attribute_name from #{name.inspect}"
end
inferred_name += "_list" if multivalued?
inferred_name
end
end
end
end
|
