module CssParser
  # :stopdoc:
  # Base types
  RE_NL = Regexp.new('(\n|\r\n|\r|\f)')
  RE_NON_ASCII = Regexp.new('([\x00-\xFF])', Regexp::IGNORECASE)  #[^\0-\177]
  RE_UNICODE = Regexp.new('(\\\\[0-9a-f]{1,6}(\r\n|[ \n\r\t\f])*)', Regexp::IGNORECASE | Regexp::EXTENDED | Regexp::MULTILINE)
  RE_ESCAPE = Regexp.union(RE_UNICODE, '|(\\\\[^\n\r\f0-9a-f])')
  RE_IDENT = Regexp.new("[\-]?([_a-z]|#{RE_NON_ASCII}|#{RE_ESCAPE})([_a-z0-9\-]|#{RE_NON_ASCII}|#{RE_ESCAPE})*", Regexp::IGNORECASE)

  # General strings
  RE_STRING1 = Regexp.new('(\"(.[^\n\r\f\\"]*|\\\\' + RE_NL.to_s + '|' + RE_ESCAPE.to_s + ')*\")')
  RE_STRING2 = Regexp.new('(\'(.[^\n\r\f\\\']*|\\\\' + RE_NL.to_s + '|' + RE_ESCAPE.to_s + ')*\')')
  RE_STRING = Regexp.union(RE_STRING1, RE_STRING2)

  RE_URI = Regexp.new('(url\([\s]*([\s]*' + RE_STRING.to_s + '[\s]*)[\s]*\))|(url\([\s]*([!#$%&*\-~]|' + RE_NON_ASCII.to_s + '|' + RE_ESCAPE.to_s + ')*[\s]*)\)', Regexp::IGNORECASE | Regexp::EXTENDED  | Regexp::MULTILINE)
  URI_RX = /url\(("([^"]*)"|'([^']*)'|([^)]*))\)/im

  # Initial parsing
  RE_AT_IMPORT_RULE = /\@import[\s]+(url\()?["']+(.[^'"]*)["']\)?([\w\s\,]*);?/i
  
  #--
  #RE_AT_MEDIA_RULE = Regexp.new('(\"(.[^\n\r\f\\"]*|\\\\' + RE_NL.to_s + '|' + RE_ESCAPE.to_s + ')*\")')
  
  #RE_AT_IMPORT_RULE = Regexp.new('@import[\s]*(' + RE_STRING.to_s + ')([\w\s\,]*)[;]?', Regexp::IGNORECASE) -- should handle url() even though it is not allowed
  #++
  IMPORTANT_IN_PROPERTY_RX = /[\s]*\!important[\s]*/i
  STRIP_CSS_COMMENTS_RX = /\/\*.*?\*\//m
  STRIP_HTML_COMMENTS_RX = /\<\!\-\-|\-\-\>/m

  # Special units
  BOX_MODEL_UNITS_RX = /(auto|inherit|0|([\-]*([0-9]+|[0-9]*\.[0-9]+)(e[mx]+|px|[cm]+m|p[tc+]|in|\%)))([\s;]|\Z)/imx
  RE_LENGTH_OR_PERCENTAGE = Regexp.new('([\-]*(([0-9]*\.[0-9]+)|[0-9]+)(e[mx]+|px|[cm]+m|p[tc+]|in|\%))', Regexp::IGNORECASE)
  RE_BACKGROUND_POSITION = Regexp.new("((#{RE_LENGTH_OR_PERCENTAGE})|left|center|right|top|bottom)", Regexp::IGNORECASE | Regexp::EXTENDED)
  FONT_UNITS_RX = /(([x]+\-)*small|medium|large[r]*|auto|inherit|([0-9]+|[0-9]*\.[0-9]+)(e[mx]+|px|[cm]+m|p[tc+]|in|\%)*)/i
 
  # Patterns for specificity calculations
  ELEMENTS_AND_PSEUDO_ELEMENTS_RX = /((^|[\s\+\>]+)[\w]+|\:(first\-line|first\-letter|before|after))/i
  NON_ID_ATTRIBUTES_AND_PSEUDO_CLASSES_RX = /(\.[\w]+)|(\[[\w]+)|(\:(link|first\-child|lang))/i

  # Colours
  RE_COLOUR_RGB = Regexp.new('(rgb[\s]*\([\s-]*[\d]+(\.[\d]+)?[%\s]*,[\s-]*[\d]+(\.[\d]+)?[%\s]*,[\s-]*[\d]+(\.[\d]+)?[%\s]*\))', Regexp::IGNORECASE)
  RE_COLOUR_HEX = /(#([0-9a-f]{6}|[0-9a-f]{3})([\s;]|$))/i
  RE_COLOUR_NAMED = /([\s]*^)?(aqua|black|blue|fuchsia|gray|green|lime|maroon|navy|olive|orange|purple|red|silver|teal|white|yellow|transparent)([\s]*$)?/i
  RE_COLOUR = Regexp.union(RE_COLOUR_RGB, RE_COLOUR_HEX, RE_COLOUR_NAMED)
  # :startdoc:
end