Class: Ambling::Utils::SettingsGenerator

Inherits:
Object
  • Object
show all
Defined in:
lib/ambling/utils.rb

Overview

generate a ruby class from the amchart settings XML

Instance Method Summary collapse

Instance Method Details

#generate(chart_type, xml) ⇒ Object

Turn the provided xml into a class for chart_type



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# File 'lib/ambling/utils.rb', line 60

def generate(chart_type, xml)
  require 'xmlparser'
  @parser=XML::Parser.new
  class <<@parser
    # enable additional events
    attr_accessor :comment, :xmlDecl
  end
  
  current_section_data = section_data = SettingsSection.new("xml")
  section_data_stack = []
  current_element = nil
  last_element = nil
  # Sam Ruby has code that does something very much like this
  @parser.parse(xml) do |type, name, data|
    case type
    when XML::Parser::START_ELEM
      # name = element name  ; data = hash of attributes
      if not current_section_data.values[name]
        current_section_data.values[name] = SettingsSection.new(name, data ? data.keys : [])
      end
      section_data_stack << current_section_data
      current_section_data = current_section_data.values[name]
      current_element = name
      last_element = nil
    when XML::Parser::END_ELEM
      # name = element name  ; data = nil
      end_section_data = current_section_data
      current_section_data = section_data_stack.pop
      last_element = current_element
      current_element = nil
    when XML::Parser::COMMENT                           
      # name = nil           ; data = string
      if current_section_data.values.empty?
        current_section_data.comment = data
      else
        if current_section_data.values[last_element]
          current_section_data.values[last_element].comment = data
        end
      end
    end
  end
  
  top_level = section_data.values.first.last
  top_level.comment = section_data.comment if top_level.comment.blank?
  
  cdef = "# Auto generated from XML file\n"
  cdef << "require 'ambling/base'\nmodule Ambling\n  class #{chart_type.to_s.camelize}\n"
  cdef << top_level.to_class_s(4)
  cdef << "\n  end\nend\n"
end