42 lines
1.5 KiB
Python
42 lines
1.5 KiB
Python
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"""Dice rolling operations (outside of the lex/yacc roller)."""
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import random
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import numexpr
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rand = random.SystemRandom()
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def cypher_roll(difficulty=None, mods=0):
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"""Make a Cypher System roll.
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Args:
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difficulty: the original difficulty to beat; if provided, success or failure is indicated in the results
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mods: eases(-) and hindrances(+) to apply to the check, as a string (e.g. '-3+1')
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Returns:
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tuple of:
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- the result on the d20
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- the highest difficulty beaten
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- if the difficulty is known, if the target was beat
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- miscellaneous effects
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"""
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roll = rand.randint(1, 20)
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if roll == 1:
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return (roll, None, False if difficulty else None, 'a GM intrusion')
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effect = None
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if roll == 17:
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effect = '+1 damage'
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elif roll == 18:
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effect = '+2 damage'
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elif roll == 19:
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effect = 'a minor effect'
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elif roll == 20:
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effect = 'a MAJOR EFFECT'
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# if we know the difficulty, the mods would adjust the difficulty, but for the case where we don't,
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# and maybe just in general, it's easier to modify the difficulty that the roll beats, so we flip the logic
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# if incoming eases are a negative number, they should add to the difficulty the roll beats
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beats = (roll // 3) - (numexpr.evaluate(mods).item() if mods else 0)
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beats = 0 if beats < 0 else beats
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return (roll, beats, difficulty <= beats if difficulty else None, effect)
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