require 'nokogiri' module Twilio module TwiML class TwiMLError < StandardError; end class LeafNode def initialize(content) @content = content end end class Comment < LeafNode def xml(document) Nokogiri::XML::Comment.new(document, @content) end end class Text < LeafNode def xml(document) Nokogiri::XML::Text.new(@content, document) end end class TwiML attr_accessor :name def initialize(**keyword_args) @overrides = { aliasAttribute: 'alias', xmlLang: 'xml:lang', interpretAs: 'interpret-as', for_: 'for', } @name = self.class.name.split('::').last @value = nil @verbs = [] @attrs = {} keyword_args.each do |key, val| corrected_key = @overrides.fetch(key, TwiML.to_lower_camel_case(key)) @attrs[corrected_key] = val unless val.nil? end end def self.to_lower_camel_case(symbol) # Symbols don't have the .split method, so convert to string first result = symbol.to_s if result.include? '_' result = result.split('_').map(&:capitalize).join end result[0].downcase + result[1..result.length] end def to_s(xml_declaration = true) save_opts = Nokogiri::XML::Node::SaveOptions::DEFAULT_XML if !xml_declaration save_opts = save_opts | Nokogiri::XML::Node::SaveOptions::NO_DECLARATION end opts = { encoding: 'UTF-8', indent: 0, save_with: save_opts } document = Nokogiri::XML::Document.new document << self.xml(document) document.to_xml(opts) end def xml(document) # create XML element value = (@value.is_a?(String) or @value == nil) ? @value : JSON.generate(@value) elem = Nokogiri::XML::Node.new(@name, document) elem.content = value # set element attributes keys = @attrs.keys.sort keys.each do |key| value = @attrs[key] value_is_boolean = value.is_a?(TrueClass) || value.is_a?(FalseClass) elem[key] = value_is_boolean ? value.to_s.downcase : value.to_s end @verbs.each do |verb| elem << verb.xml(document) end elem end def append(verb) unless verb.is_a?(TwiML) || verb.is_a?(LeafNode) raise TwiMLError, 'Only appending of TwiML is allowed' end @verbs << verb self end def comment(body) append(Comment.new(body)) end def add_text(content) append(Text.new(content)) end def add_child(name, value=nil, **keyword_args) node = GenericNode.new(name, value, **keyword_args) yield node if block_given? append(node) end alias to_xml to_s end class GenericNode < TwiML def initialize(name, value, **keyword_args) super(**keyword_args) @name = name @value = value end end end end