Sketch

/* Tom's SVG Path machine..
 *
 * CMD  PARAMS  NAME                    NOTES
 * M    (x y)+  moveto absolute         Extra x,y pairs: implicit 'lineto'
 * L    (x y)+  lineto absolute         Extra x,y pairs: continue drawing lines
 * Z,z          closepath
 * H    x+      horiz lineto abs
 * V    x+      vert lineto abs
 * C    (x1 y1 x2 y2 x y)+   curveto    Cubic Bezier
 * S    (x2 y2 x y)+         curveto    shorthand (x1,y1 reflected)
 * Q    (x1 y1 x y)+         curveto    Quadratic Bezier
 * T    (x y)+               curveto    shorthand
 * A    ... see spec ...     arc        Elliptical arc.....
 *
 * Note: all commands are *relative* if lowercased (except closepath)
 */

/* Ooops, someone already did that work... from SVG tokenizer (svg.cc):

  - spaces are allowed (except within a number) as well as ','
  - a number starts with '-' or number.
  - a number ends when the next character is not a number or '.'
  - a command is a letter. Allowed letters are:
    Z z - closePath (0)
    L l - lineto (2)
    H h - horizontal lineto (1)
    V v - vertical lineto (1)
    C c - curveto (6)
    S s - smooth curveto (4)
    Q q - quadratic bezier curveto (4)
    T t - smooth quadratic bezier curveto (2)
    A a - elliptical arc (7)
  - Each command is followed by n arguments. The arguments can be
    repeated by multiply of n to mark up another similar command.
*/