gistfile1.js

/*
transform-list:
    wsp* transforms? wsp*
transforms:
    transform
    | transform comma-wsp+ transforms
transform:
    matrix
    | translate
    | scale
    | rotate
    | skewX
    | skewY
matrix:
    "matrix" wsp* "(" wsp*
       number comma-wsp
       number comma-wsp
       number comma-wsp
       number comma-wsp
       number comma-wsp
       number wsp* ")"
translate:
    "translate" wsp* "(" wsp* number ( comma-wsp number )? wsp* ")"
scale:
    "scale" wsp* "(" wsp* number ( comma-wsp number )? wsp* ")"
rotate:
    "rotate" wsp* "(" wsp* number ( comma-wsp number comma-wsp number )? wsp* ")"
skewX:
    "skewX" wsp* "(" wsp* number wsp* ")"
skewY:
    "skewY" wsp* "(" wsp* number wsp* ")"
number:
    sign? integer-constant
    | sign? floating-point-constant
comma-wsp:
    (wsp+ comma? wsp*) | (comma wsp*)
comma:
    ","
integer-constant:
    digit-sequence
floating-point-constant:
    fractional-constant exponent?
    | digit-sequence exponent
fractional-constant:
    digit-sequence? "." digit-sequence
    | digit-sequence "."
exponent:
    ( "e" | "E" ) sign? digit-sequence
sign:
    "+" | "-"
digit-sequence:
    digit
    | digit digit-sequence
digit:
    "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9"
wsp:
    (#x20 | #x9 | #xD | #xA)
    
*/

(function(){
  
  var wsp = '(\\u0020|\\u0009|\\u000D|\\u000A)';  
  var digit = '\\d';
  var digit_sequence = digit + '*';
  var sign = '[-+]';
  var exponent = '[eE]' + sign + '?' + digit_sequence;
  
  var fractional_constant = 
    '(' + 
      digit_sequence + '?' + '\\.' + digit_sequence + 
      '|' +
      digit_sequence + '\\.' +
    ')';
    
  var floating_point_constant = 
    '(' + 
      fractional_constant + exponent + '?' + 
      '|' + 
      digit_sequence + exponent + 
    ')';
  
  var integer_constant = digit_sequence;
  var comma = ',';
  var comma_wsp = 
    '(' + 
      '(' + wsp + '+' + comma + '?' + wsp + '+' + ')' + 
      '|' + 
      '(' + comma + wsp + '*' + ')' + 
    ')';
  
  var number = 
    '(' + 
      sign + '?' + integer_constant + 
      '|' + 
      sign + '?' + floating_point_constant + 
    ')';
  
  var skewY = '(' + 'skewY' + wsp + '*' + '(' + wsp + '*' + number + wsp + '*' + ')' + ')';
  var skewX = '(' + 'skewX' + wsp + '*' + '(' + wsp + '*' + number + wsp + '*' + ')' + ')';
  
  var rotate = 
    '(' + 
      'rotate' + wsp + '*' + 
        '(' + wsp + '*' +
          number + '(' + comma_wsp + number + comma_wsp + number + ')' + '?' + wsp + '*' + 
        ')' + 
    ')';
    
  var scale = 
    '(' + 
      'scale' + wsp + '*' + 
        '(' + wsp + '*' + 
          number + '(' + comma_wsp + number + ')?' + wsp + '*' + 
        ')' + 
    ')';
    
  var translate = 
    '(' + 
      'translate' + wsp + '*' + 
        '(' + wsp + '*' + 
          number + '(' + comma_wsp + number + ')?' + wsp + '*' + 
        ')' + 
    ')';
    
  var matrix = 
    '(' + 
      'matrix' + wsp + '*' + 
      '(' + 
        wsp + '*' +
          number + comma_wsp +
          number + comma_wsp +
          number + comma_wsp +
          number + comma_wsp +
          number + comma_wsp +
          number + 
        wsp + '*' + 
      ')' + 
    ')';
  
  var transform = 
    '(' +
      matrix |
      translate |
      scale |
      rotate |
      skewX |
      skewY
    ')';
    
  var transforms = '(' + transform + comma_wsp ')'
  
  return new RegExp(transform_list);
})();