gistfile1.js

start
  = w:(die _)* { return w.map(function(X) { return X[0] }); }

number
  = [0-9]

nonzero
  = [1-9]

symbol
  = [\+-]

count
  = integer

diesize
  = 'd' int:integer                     { return int; }

modifier
  = '+' int:integer                     { return int; }
  / '-' int:integer                     { return -1 * int; }

die
  = cnt:count sz:diesize mod:modifier   { return { count: cnt, size: sz, adjust: mod }; }
  / cnt:count sz:diesize                { return { count: cnt, size: sz, adjust: 0   }; }
  / sz:diesize mod:modifier             { return { count: 1,   size: sz, adjust: mod }; }
  / sz:diesize                          { return { count: 1,   size: sz, adjust: 0   }; }

integer
  = nz:nonzero num:number*              { return parseInt(nz + num.join(''), 10); }

// optional whitespace
_  = [ \t\r\n]*

// mandatory whitespace
__ = [ \t\r\n]+