59 lines
1.7 KiB
Python
59 lines
1.7 KiB
Python
"""
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dice.py: written by Scaevolus 2008, updated 2009
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simulates dicerolls
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"""
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import re
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import random
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import hook
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whitespace_re = re.compile(r'\s+')
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valid_diceroll_re = re.compile(r'^[+-]?(\d+|\d*d\d+)([+-](\d+|\d*d\d+))*$')
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sign_re = re.compile(r'[+-]?(?:\d*d)?\d+')
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split_re = re.compile(r'([\d+-]*)d?(\d*)')
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def nrolls(count, n):
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"roll an n-sided die count times"
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if n < 2: #it's a coin
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if count < 5000:
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return sum(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))
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else:
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if count < 5000:
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return sum(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,
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(((n+1)*(2*n+1)/6.-(.5*(1+n))**2)*count)**.5))
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@hook.command
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def dice(input):
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".dice <diceroll> - simulates dicerolls, e.g. .dice 2d20-d5+4 roll 2 " \
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"D20s, subtract 1D5, add 4"
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if not input.strip():
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return dice.__doc__
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spec = whitespace_re.sub('', input)
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if not valid_diceroll_re.match(spec):
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return "Invalid diceroll"
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sum = 0
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groups = sign_re.findall(spec)
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for roll in groups:
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count, side = split_re.match(roll).groups()
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if side == "":
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sum += int(count)
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else:
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count = int(count) if count not in" +-" else 1
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side = int(side)
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try:
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if count > 0:
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sum += nrolls(count, side)
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else:
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sum -= nrolls(abs(count), side)
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except OverflowError:
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return "Thanks for overflowing a float, jerk >:["
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return str(sum)
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