ox push parser (enumerator)

push_parser.rb

require 'enumerator'
require 'ox'

module Ox
  class PushParser
    DEFAULT_BUFSIZE = 4096

    def initialize(handler, options = {}, &blk)
      @buf = ''
      @generator = Enumerator.new(&blk)
      @handler, @options = handler, options
    end

    def read(maxlen = nil)
      while @buf.empty?
        @buf << @generator.next
      end

      @buf.slice!(0, maxlen || @buf.length)
    rescue StopIteration
      ''
    end

    def parse
      Ox.sax_parse(@handler, self, @options)
    end
  end
end

push_parser_example.rb

class Sample < ::Ox::Sax
  def start_element(name); puts "start: #{name}";        end
  def end_element(name);   puts "end: #{name}";          end
  def attr(name, value);   puts "  #{name} => #{value}"; end
  def text(value);         puts "text #{value}";         end
end

handler = Sample.new

p = Ox::PushParser.new(handler) do |parser|
  parser << '<top name="sample"'
  parser << '><middle name="second'
  parser << '">helo</middle>'
  parser << '</top>'
end
p.parse