Class: SAXMachine::SAXHandler

Inherits:
Nokogiri::XML::SAX::Document
  • Object
show all
Defined in:
lib/lazy-sax-machine/sax_handler.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(object) ⇒ SAXHandler

Returns a new instance of SAXHandler.



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# File 'lib/lazy-sax-machine/sax_handler.rb', line 7

def initialize(object)
  @stack = [[object, nil, ""]]
  @parsed_configs = []
end

Instance Attribute Details

#stack ⇒ Object (readonly)

Returns the value of attribute stack.



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# File 'lib/lazy-sax-machine/sax_handler.rb', line 5

def stack
  @stack
end

Instance Method Details

#cdata_block(string) ⇒ Object 



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# File 'lib/lazy-sax-machine/sax_handler.rb', line 21

def cdata_block(string)
  characters(string)
end

#characters(string) ⇒ Object

characters might be called multiple times according to docs



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# File 'lib/lazy-sax-machine/sax_handler.rb', line 13

def characters(string)
  if value = stack.last[2]
    value << string
  else
    stack.last.push(string)
  end
end

#end_element(name) ⇒ Object 



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# File 'lib/lazy-sax-machine/sax_handler.rb', line 57

def end_element(name)
  (object, tag_config, _), (element, config, value) = stack[-2..-1]
  return unless stack.size > 1 && config && config.name == name
  stack.pop

  unless parsed_config?(object, config)
    if (element_value_config = config.data_class.respond_to?(:sax_config) && config.data_class.sax_config.element_values_for_element)
      element_value_config.each { |evc| element.send(evc.setter, value) }
    end

    if config.respond_to?(:accessor)
      subconfig = element.class.sax_config if element.class.respond_to?(:sax_config)
      if econf = subconfig.element_config_for_tag(name,[])
        element.send(econf.setter, value) unless econf.value_configured?
      end
      object.send("add_#{config.accessor}", element)
    else
      if config.data_class
        tmp = value
        element.define_singleton_method(:inner_text) { tmp }
        value = element
      else
        value.define_singleton_method(:inner_text) { value }
      end
      object.send(config.setter, value) if value
      mark_as_parsed(object, config)
    end
  end
end

#mark_as_parsed(object, element_config) ⇒ Object

now we have an array where the next element represents the child of the previous once we come back to a parent element, the child’s hash should be removed



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# File 'lib/lazy-sax-machine/sax_handler.rb', line 90

def mark_as_parsed(object, element_config)
  return if element_config.collection?
  (@parsed_configs[stack.size] ||= {})[
    [object.object_id, element_config.object_id]
  ] = true
end

#parsed_config?(object, element_config) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/lazy-sax-machine/sax_handler.rb', line 97

def parsed_config?(object, element_config)
  last_size = @stack_size || 0
  @stack_size = stack.size
  if @stack_size < last_size
    # free memory
    @parsed_configs.slice!(@stack_size + 1 .. -1)
  end
  h = @parsed_configs[@stack_size]
  h and h[[object.object_id, element_config.object_id]]
end

#start_element(name, attrs = []) ⇒ Object 



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# File 'lib/lazy-sax-machine/sax_handler.rb', line 25

def start_element(name, attrs = [])
  object, config, _ = stack.last
  sax_config = object.class.respond_to?(:sax_config) ? object.class.sax_config : nil
    
  if sax_config
    if collection_config = sax_config.collection_config(name, attrs)
      stack.push [object = collection_config.data_class.new, collection_config]
      sax_config = object.class.sax_config

      if (attribute_config = object.class.respond_to?(:sax_config) && object.class.sax_config.attribute_configs_for_element(attrs))
        attribute_config.each { |ac| object.send(ac.setter, ac.value_from_attrs(attrs)) }
      end
    end

    sax_config.element_configs_for_attribute(name, attrs).each do |ec|
      unless parsed_config?(object, ec)
        object.send(ec.setter, ec.value_from_attrs(attrs))
        mark_as_parsed(object, ec)
      end
    end

    if !collection_config && element_config = sax_config.element_config_for_tag(name, attrs)
      new_object = element_config.data_class ? element_config.data_class.new : object
      stack.push [new_object, element_config]

      if (attribute_config = new_object.class.respond_to?(:sax_config) && new_object.class.sax_config.attribute_configs_for_element(attrs))
        attribute_config.each { |ac| new_object.send(ac.setter, ac.value_from_attrs(attrs)) }
      end
    end
  end
end