132 lines
3.9 KiB
Python
132 lines
3.9 KiB
Python
# dice.py
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#
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# This module contains a class to represent various RPG-style dice expressions.
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# These can then be rolled and the results, both total and individual rolls, returned.
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#
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# This module assumes that the built-in python PRNG (Mersenne Twister) is acceptable.
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# Support for real entropy is an RFE.
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import random
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import re
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class Dice():
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# This builds dice out of a simple input format
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# All of the dark regex magic is contained to this function,
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# lest it corrupt innocent code
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@classmethod
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def from_str(cls, desc):
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if not re.match(r'^\d+d\d+', desc):
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raise Exception('Dice format invalid. See --help')
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(n, s) = re.match(r'^(\d+)d(\d+)', desc).groups()
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num = int(n)
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sides = int(s)
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mod = 0
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drop_low = 0
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drop_high = 0
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reroll = 0
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reroll_times = 0
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for m in re.findall(r'[lh+-]\d+', desc):
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if m[0] == '-':
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mod += int(m)
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elif m[0] == '+':
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mod += int(m[1:])
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elif m[0] == 'h':
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drop_high = int(m[1:])
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elif m[0] == 'l':
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drop_low = int(m[1:])
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m = re.search(r'r(\d+)(x\d+)?', desc)
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if m:
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(r, rt) = m.groups()
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reroll = int(r)
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if rt:
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reroll_times = int(rt[1:])
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return cls(num, sides, mod, drop_low, drop_high, reroll, reroll_times)
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def __init__(self, num, sides, mod, drop_low=0, drop_high=0, reroll=0, reroll_times=0):
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self.num = num
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self.sides = sides
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self.mod = mod
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self.drop_low = drop_low
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self.drop_high = drop_high
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self.reroll = reroll
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self.reroll_times = reroll_times
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self.times_rolled = 0
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def num_rolls(self):
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return self.times_rolled
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# Rolls the dice, returns a structure
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# containing the result plus metadata
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def roll(self, verbose=False):
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results = []
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rerolled = []
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dropped = []
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# Roll the actual dice, handling rerolls
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for i in range(0, self.num):
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count = 0
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result = 0
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while result <= self.reroll or result == 0:
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if self.reroll_times and count >= self.reroll_times:
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break
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result = random.randint(1, self.sides)
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count += 1
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if result <= self.reroll:
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rerolled.append(result)
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results.append(result)
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# Drop any high or low, if specified
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if self.drop_low or self.drop_high:
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results.sort()
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if self.drop_low:
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dropped.extend(results[:self.drop_low])
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results = results[self.drop_low:]
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if self.drop_high:
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dropped.extend(results[-1 * self.drop_high:])
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results = results[:-1 * self.drop_high]
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random.shuffle(results)
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# Get the results
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total = sum(results) + self.mod
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self.times_rolled += 1
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return {'total': total, 'rolls': results, 'dropped': dropped, 'rerolled': rerolled}
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def __str__(self):
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reroll_info = ''
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drop_info = ''
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mod_info = ''
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if self.reroll:
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reroll_info = ' [reroll {}'.format(self.reroll)
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if self.reroll_times:
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reroll_info = reroll_info + 'x{}'.format(self.reroll_times)
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reroll_info = reroll_info + ']'
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if self.drop_low:
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drop_info = drop_info + ' [drop low {}]'.format(self.drop_low)
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if self.drop_high:
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drop_info = drop_info + ' [drop high {}]'.format(self.drop_high)
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if self.mod > 0:
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mod_info = '+{}'.format(self.mod)
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elif self.mod < 0:
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mod_info = '-{}'.format(self.mod)
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return "{num}d{sides}{mod}{drop}{reroll}".format(num=self.num, sides=self.sides, mod=mod_info, drop=drop_info, reroll=reroll_info)
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