sax2parser.rb

require 'rexml/sax2listener'
require 'rexml/parsers/sax2parser'

class MrProper
  include REXML::SAX2Listener

  BORING_ATTRS = %w(class index package
                    checkable checked clickable
                    enabled focusable focused
                    scrollable long-clickable password
                    selected bounds instance)

  INDENT_WIDTH = 2
  ATTRIBUTES_INDENT = 4

  def initialize
    @indent = 0
  end

  def start_element(uri, localname, qname, attributes)
    return if localname == 'hierarchy'

    @indent += 1

    node = ' ' * INDENT_WIDTH * @indent
    node << "class_name: '#{localname}'"

    clean_attributes = attributes.delete_if { |k, v| BORING_ATTRS.include?(k) || v.empty? }

    if value = clean_attributes.delete('resource-id')
      clean_attributes[:id] = value
    end

    unless clean_attributes.empty?
      node << ' ' * ATTRIBUTES_INDENT
      node << clean_attributes.map { |k, v| "#{k}: '#{v}'" }.join(', ')
    end

    puts node
  end

  def end_element(uri, localname, qname)
    @indent -= 1
  end
end


p = REXML::Parsers::SAX2Parser.new(File.open('xml'))
p.listen(MrProper.new)
p.parse

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