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dice.py
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dice.py
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import secrets
import enum
import typing
from pypeg2 import *
from entities import Entity, RollResult, Span
class DiceErrorKind(enum.Enum):
ZERO_DIVISION = 'ZERO_DIVISION'
ROLL_SYNTAX_ERROR = 'ROLL_SYNTAX_ERROR'
class RollError(RuntimeError):
pass
class Env:
def __init__(self, face=20):
self.face = face
class Number(Symbol):
regex = re.compile(r'\d{1,4}')
def eval(self, *_args):
return int(self.name), self.name
class Operator(Symbol):
display = ''
class Add(Operator):
regex = re.compile(r'\+')
display = '+'
class Sub(Operator):
regex = re.compile(r'-')
display = '-'
class Mul(Operator):
regex = re.compile(r'[*×]')
display = '×'
class Div(Operator):
regex = re.compile(r'[/÷]')
display = '÷'
operator = [Add, Sub, Mul, Div]
class Dice(Symbol):
regex = re.compile(r'\d{0,4}[dD]\d{0,4}')
def eval(self, env: Env, result_sum=True):
match = self.name.split('d')
try:
counter = int(match[0])
except ValueError:
counter = 1
try:
face = int(match[1])
except:
face = env.face
if face == 0 or counter == 0:
result = [0]
elif face == 1:
result = [1 for _ in range(counter)]
else:
result = [secrets.randbelow(face) + 1 for _ in range(counter)]
if len(result) > 16:
result_text = '={...}'
elif counter < 2:
result_text = ''
else:
result_text = '={{{}}}'.format(', '.join(map(str, result)))
show = '{}d{}{}'.format(counter, face, result_text)
if result_sum:
result = sum(result)
show += '={}'.format(result)
return result, show
class Max:
dice = None
grammar = (
["最大", "max", "MAX", "Max"],
[('(', attr('dice', Dice), ')'), ('(', attr('dice', Dice), ')'), attr('dice', Dice)]
)
def eval(self, env):
value, text = self.dice.eval(env, result_sum=False)
result = max(value)
return result, 'max {}'.format(text, result)
class Min:
dice = None
grammar = (
["最小", "min", "Min", "MIN"],
[('(', attr('dice', Dice), ')'), ('(', attr('dice', Dice), ')'), attr('dice', Dice)]
)
def eval(self, env):
value, text = self.dice.eval(env, result_sum=False)
result = min(value)
return result, 'min {}'.format(text, min(value))
# left recursion!
# https://bitbucket.org/fdik/pypeg/issues/4/
class Expr(List):
def eval(self, env):
value_list = []
show_list = []
for i in self:
if not isinstance(i, Operator):
v, show = i.eval(env)
value_list.append(v)
show_list.append(show)
else:
show_list.append(i.display)
value_list.append(i)
for i, current in enumerate(value_list):
if isinstance(current, (Mul, Div)):
a = value_list[i - 1]
b = value_list[i + 1]
if isinstance(current, Mul):
value_list[i + 1] = a * b
elif b == 0:
raise RollError(DiceErrorKind.ZERO_DIVISION)
else:
value_list[i + 1] = a // b
value_list[i] = None
value_list[i - 1] = None
value_list = list(filter(lambda x: x is not None, value_list))
result = value_list[0]
for i, current in enumerate(value_list):
if isinstance(current, Add):
result += value_list[i + 1]
elif isinstance(current, Sub):
result -= value_list[i + 1]
return result, '[{}]={}'.format(' '.join(show_list), result)
item = [Dice, Number, Max, Min, ('(', Expr, ')')]
Expr.grammar = (item, maybe_some(operator, item))
class Roll(List):
grammar = maybe_some([
Expr,
re.compile(r'[^。.;,,、…!!?/ ⧸⁄—-【】“”"()()::\[\]{}<>《》〔〕『』‘’「」\s]+'),
re.compile(r'[。.;,,、…!!?/ ⧸⁄—-【】“”"()()::\[\]{}<>《》〔〕『』‘’「」]+'),
])
def eval_entities(self, env) -> typing.List[Entity]:
entities = []
for e in self:
if isinstance(e, str):
entities.append(Span(e))
else:
value, text = e.eval(env)
result_value = value
entities.append(RollResult(text, result_value))
return entities
def eval(self, env):
expr_count = 0
result_value = 0
result_text = []
for e in self:
if isinstance(e, str):
result_text.append(e)
else:
value, text = e.eval(env)
result_value = value
expr_count += 1
result_text.append('<code>{}</code>'.format(text))
if expr_count == 0:
result_value, text = parse('1d', Dice).eval(env)
result_text.insert(0, '<code>{}</code>'.format(text))
return result_value, ' '.join(result_text)
def roll_entities(text, default_dice_face) -> typing.List[Entity]:
env = Env(face=default_dice_face)
try:
roll_ast = parse(text, Roll)
except SyntaxError:
raise RollError(DiceErrorKind.ROLL_SYNTAX_ERROR)
return roll_ast.eval_entities(env)
def roll(text, default_dice_face):
env = Env(face=default_dice_face)
try:
roll_ast = parse(text, Roll)
except SyntaxError:
raise RollError(DiceErrorKind.ROLL_SYNTAX_ERROR)
return roll_ast.eval(env)