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dice.lua
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dice.lua
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--[[
dice.lua - A dice rolling module useful for bell curve type random distributions
================================================================================
(c)2013 Shaun Sullivan
Electric Plum, LLC
www.electricplum.com
twitter: @LiquidSullivan
email: shaun@electricplum.com
Please use freely in any of your projects!
Example usage:
local dice = require("dice")
-- Most compact method roll 4d6 and subtract 2 from the roll
local dRoller = dice.new({dice=4, sides=6, adjust=-2})
dRoller.roll()
local dRoller = dice.new()
-- Roll 3 6 sided dice and add 1 to the result (string method)
local roll = dRoller.rollFromDiceString("3d6+1")
print("roll = "..tostring(roll))
-- Add 3 8 sided dice and one 12 and then roll
dRoller.reset()
dRoller.addMultipleDice(3, 8)
dRoller.addDie(12)
roll = dRoller.roll()
print("roll = "..roll)
-- Roll 4 10-sided dice and add 6 to the total
for i=1,10 do
print(dRoller.rollFromDiceString("4d10+6"))
end
]]--
module (..., package.seeall)
-------------------------------------------------------------------------------
-- new
--
-- Construct a new one and return it
-- Optional object constructor arguments: {dice, sides, adjust, seed}
--
-------------------------------------------------------------------------------
new = function(args)
-- Table we'll return
local t = {}
-- privates
-- array of dice
local _dies = {}
-- number of dice
local _numDies = 0
-- random seed to use default to os.time() but can be overriden by the caller
local _seed = os.time()
-- something to add or subtract to/from the die roll
local _adjust = 0
-------------------------------------------------------------------------------
-- initInternal
-------------------------------------------------------------------------------
local initInternal = function(args)
if args then
-- Use the caller's seed or just seed with the time
_seed = args.seed or _seed
_numDies = args.dice or 0
_adjust = args.adjust or 0
if (_numDies > 0) then
for i=1,_numDies do
-- default to 6 sided
_dies[i] = args.sides or 6
end
end
else
-- No args passed at all, so we start empty
_seed = os.time()
_numDies = 0
_adjust = 0
end
-- Seed, note the caller can pass in a seed to get a repeatable sequence
math.randomseed(_seed)
end
-------------------------------------------------------------------------------
-- rollInternal
-------------------------------------------------------------------------------
local rollInternal = function()
local total = 0
for i=1,_numDies do
total = total + math.random(1, _dies[i])
end
return total + _adjust
end
-------------------------------------------------------------------------------
-- quickResetInternal
--
-- Called by rollFromDiceString to make sure it gets a clean roll
--
-------------------------------------------------------------------------------
local quickResetInternal = function()
_dies = nil
_dies = {}
_numDies = 0
_adjust = 0
end
-------------------------------------------------------------------------------
-- Constructor
-------------------------------------------------------------------------------
initInternal(args)
-- ============================================================================
-- public interface
-- ============================================================================
-------------------------------------------------------------------------------
-- reset
-------------------------------------------------------------------------------
t.reset = function(args)
initInternal(args)
end
-------------------------------------------------------------------------------
-- addDie
-------------------------------------------------------------------------------
t.addDie = function(sides)
_numDies = _numDies + 1
_dies[_numDies] = sides
end
-------------------------------------------------------------------------------
-- addMultipleDice
-------------------------------------------------------------------------------
t.addMultipleDice = function(numDiceToAdd, numSides)
numDiceToAdd = numDiceToAdd or 1
numSides = numSides or 6
if (numDiceToAdd < 1) then
print("bad args, forcing one die")
numDiceToAdd = 1
end
if (numSides < 1) then
print("bad args, forcing 6 sides")
numSides = 6
end
--for i=1,#_dies do
for i=1,numDiceToAdd do
_numDies = _numDies + 1
_dies[_numDies] = numSides
end
end
-------------------------------------------------------------------------------
-- rollFromDiceString
--
-- Pass in a string like "4d6+3" (roll 4 6 sided dice and add 3)
-------------------------------------------------------------------------------
t.rollFromDiceString = function(s)
-- "split" Lifted from Crawlspace Lib
-- https://github.com/AdamBuchweitz/CrawlSpaceLib
local split = function(str, pat)
local t = {}
local fpat = "(.-)" .. pat
local last_end = 1
local s, e, cap = str:find(fpat, 1)
while s do
if s ~= 1 or cap ~= "" then table.insert(t,cap) end
last_end = e+1
s, e, cap = str:find(fpat, last_end)
end
if last_end <= #str then
cap = str:sub(last_end)
table.insert(t,cap)
end
return t
end
-- Sanity check to at least make sure we have a "d" in the string
local dLoc = string.find(s, "d") or 0
if (dLoc > 0) then
local addSubRoll = 0
local dice = split(s, "d")
local numD = tonumber(dice[1])
local stopAt = 0
local sides = 0
-- not super robust here, you could pass in +- in the same
-- string and break it, but just testing...
if (string.find(s, "+")) then
local plus = string.find(s, "+")
addSubRoll = tonumber(string.sub(s, plus + 1))
stopAt = plus - 1
elseif (string.find(s, "-")) then
local minus = string.find(s, "-")
addSubRoll = tonumber(string.sub(s, minus + 1)) * -1
stopAt = minus - 1
else
stopAt = 0
end
local dPos = string.find(s, "d")
if (stopAt ~= 0) then
sides = tonumber(string.sub(s, dPos + 1, stopAt))
else
sides = tonumber(string.sub(s, dPos))
end
-- We don't want to add to previous initializations
quickResetInternal()
t.addMultipleDice(numD, sides)
_adjust = addSubRoll
return(rollInternal())
else
assert(false, "Bad arguments")
end
end
-------------------------------------------------------------------------------
-- roll
-------------------------------------------------------------------------------
t.roll = function()
return rollInternal()
end
-------------------------------------------------------------------------------
-- get_Seed
--
-- getter for the seed if the caller wants to store it for
-- some future replay
-------------------------------------------------------------------------------
t.get_Seed = function()
return _seed
end
return t
end