h/plugins/dice.py

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"""
dice.py: written by Scaevolus 2008, updated 2009
simulates dicerolls
"""
import re
import random
from util import hook
whitespace_re = re.compile(r'\s+')
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valid_diceroll = r'^([+-]?(?:\d+|\d*d(?:\d+|F))(?:[+-](?:\d+|\d*d(?:\d+|F)))*)( .+)?$'
valid_diceroll_re = re.compile(valid_diceroll, re.I)
sign_re = re.compile(r'[+-]?(?:\d*d)?(?:\d+|F)', re.I)
split_re = re.compile(r'([\d+-]*)d?(F|\d*)', re.I)
def nrolls(count, n):
"roll an n-sided die count times"
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if n == "F":
return [random.randint(-1,1) for x in xrange(count)]
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if n < 2: # it's a coin
if count < 5000:
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return [random.randint(0, 1) for x in xrange(count)]
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else: # fake it
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return [int(random.normalvariate(.5*count, (.75*count)**.5))]
else:
if count < 5000:
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return [random.randint(1, n) for x in xrange(count)]
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else: # fake it
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return [int(random.normalvariate(.5*(1+n)*count,
(((n+1)*(2*n+1)/6.-(.5*(1+n))**2)*count)**.5))]
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@hook.command('roll')
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#@hook.regex(valid_diceroll, re.I)
@hook.command
def dice(inp):
".dice <diceroll> -- simulates dicerolls, e.g. .dice 2d20-d5+4 roll 2 " \
"D20s, subtract 1D5, add 4"
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desc = None
try: # if inp is a re.match object...
(inp, desc) = inp.groups()
except AttributeError:
pass # we got called via hook.command, inp is already the roll
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if desc == None: (inp, desc) = valid_diceroll_re.match(inp).groups()
if "d" not in inp: return
spec = whitespace_re.sub('', inp)
if not valid_diceroll_re.match(spec):
return "Invalid diceroll"
groups = sign_re.findall(spec)
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total = 0
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rolls = []
for roll in groups:
count, side = split_re.match(roll).groups()
count = int(count) if count not in " +-" else 1
if side.upper() == "F": # fudge dice are basically 1d3-2
for fudge in nrolls(count, "F"):
if fudge == 1:
rolls.append("\x033+\x0F")
elif fudge == -1:
rolls.append("\x034-\x0F")
else:
rolls.append("0")
total += fudge
elif side == "":
total += count
else:
side = int(side)
try:
if count > 0:
dice = nrolls(count, side)
rolls += map(str, dice)
total += sum(dice)
else:
dice = nrolls(-count, side)
rolls += [str(-x) for x in dice]
total -= sum(dice)
except OverflowError:
return "Thanks for overflowing a float, jerk >:["
if desc:
return "%s: %d (%s=%s)" % (desc.strip(), total, inp, ", ".join(rolls))
else:
return "%d (%s=%s)" % (total, inp, ", ".join(rolls))