require "libxml" require "active_support/core_ext/object/blank" require "stringio" module ActiveSupport module XmlMini_LibXMLSAX #:nodoc: extend self # Class that will build the hash while the XML document # is being parsed using SAX events. class HashBuilder include LibXML::XML::SaxParser::Callbacks CONTENT_KEY = "__content__".freeze HASH_SIZE_KEY = "__hash_size__".freeze attr_reader :hash def current_hash @hash_stack.last end def on_start_document @hash = { CONTENT_KEY => "" } @hash_stack = [@hash] end def on_end_document @hash = @hash_stack.pop @hash.delete(CONTENT_KEY) end def on_start_element(name, attrs = {}) new_hash = { CONTENT_KEY => "" }.merge!(attrs) new_hash[HASH_SIZE_KEY] = new_hash.size + 1 case current_hash[name] when Array then current_hash[name] << new_hash when Hash then current_hash[name] = [current_hash[name], new_hash] when nil then current_hash[name] = new_hash end @hash_stack.push(new_hash) end def on_end_element(name) if current_hash.length > current_hash.delete(HASH_SIZE_KEY) && current_hash[CONTENT_KEY].blank? || current_hash[CONTENT_KEY] == "" current_hash.delete(CONTENT_KEY) end @hash_stack.pop end def on_characters(string) current_hash[CONTENT_KEY] << string end alias_method :on_cdata_block, :on_characters end attr_accessor :document_class self.document_class = HashBuilder def parse(data) if !data.respond_to?(:read) data = StringIO.new(data || "") end char = data.getc if char.nil? {} else data.ungetc(char) LibXML::XML::Error.set_handler(&LibXML::XML::Error::QUIET_HANDLER) parser = LibXML::XML::SaxParser.io(data) document = self.document_class.new parser.callbacks = document parser.parse document.hash end end end end