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Contents
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
end
attr_reader :name
def help_lhs
name
end
def consume(arguments)
raise ArgumentError, "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) { $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
Version data entries
72 entries across 68 versions & 18 rubygems