Roll: a dice-language interpreter.

Web page: the Roll web page

Requires: SML/NJ and rlwrap

Some sample dice expressions:

• d6 : Roll a 6 sided die
• 2 # d6 : Roll two 6 sided dice
• 2d6 : Roll and add two 6 sided dice
• d(d 6) : Roll a 6 sided die to get n, and then roll an n-sided die
• d(sum(2#d6)) : Roll an n-sided die where n is the sum of two six-sided die rolls.
• if d6 < 4 then 4 else 2#d4 : Roll a d6, and if that is less than 4 return 4, otherwise return a bag consisting of the results of rolling 2 d4's.
• max 2 (3#d5) : Return the largest 2 values after rolling three five-sided dice.
• min 2 (3#(if d6 < d6 then 1 else 2)) : Roll two dice. If the first is smaller, return 1, else 2. Do this three times and select the lowest two values.

Roll also supports definitions, which can be loaded from a file:

• attribute = 3d6
• frodo attack = d20 + 2
• twice = 2 # frodo attack : do frodo attack twice
• char = 6#sum max 3 4#d6 : Define char to be the result of six trials of the following: roll 4 six-sided dice and sum the 3 largest.