gl.xml (*) から enum を抽出して Ruby 向けに整形&出力するテスト (*) https://cvs.khronos.org/svn/repos/ogl/trunk/doc/registry/public/api/gl.xml

generate_enum.rb

# (Execution example)
# $ ruby generate_enum.rb > glenum.rb [RETURN]
# $ head glenum.rb [RETURN]
# module OpenGL
#   GL_DEPTH_BUFFER_BIT = 0x00000100
#   GL_STENCIL_BUFFER_BIT = 0x00000400
#   GL_COLOR_BUFFER_BIT = 0x00004000
#   GL_FALSE = 0
#   GL_TRUE = 1
#   GL_POINTS = 0x0000
#   GL_LINES = 0x0001
#   GL_LINE_LOOP = 0x0002
#   GL_LINE_STRIP = 0x0003module OpenGL
# $

require 'nokogiri'

doc = Nokogiri::XML(open("./gl.xml"))

# Collect all enum
gl_all_enum_map = {}
doc.xpath('registry/enums/enum').each do |enum_tag|
  # check alias
  alias_attr = enum_tag['alias']
  next if alias_attr != nil

  gl_all_enum_map[enum_tag['name']] = enum_tag['value']
end

# Extract standard enum
gl_std_enum_map = {}
doc.xpath('registry/feature').each do |feature_tag|
  if "gl" == feature_tag['api']

    # OpenGL Standard enums
    feature_tag.xpath('require/enum').each do |tag|
      gl_std_enum_map[tag['name']] = gl_all_enum_map[tag['name']]
    end

  end
end

# Output
if __FILE__ == $0
  puts "module OpenGL"
  gl_std_enum_map.each do |enum|
    print "  #{enum[0]} = #{enum[1]}\n"
  end
  puts "end"
end