40 lines
913 B
Python
40 lines
913 B
Python
from emis_funky_funktions import *
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from typing import Collection, Sequence, TypeAlias
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from ir import Expression
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from dataclasses import dataclass
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from operator import add
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def evaluate(expr: Expression) -> Expression:
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"""
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>>> funktion = Function((
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... (SPattern(NamePattern('n')), (
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... Application((
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... Variable('+'),
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... Variable('n'),
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... Variable('n'),
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... ))
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... )),
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... (NamePattern('0'), (
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... Int(1312)
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... )),
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... ))
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>>> evaluate(Application((funktion, Int(3))))
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4
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>>> evaluate(Application((funktion, Int(0))))
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1312
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"""
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if expr.is_value():
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return expr
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else:
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match expr.step():
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case Some(next):
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return evaluate(next)
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case None:
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raise AssertionError('Evaluate called on a value which cannot step:', expr)
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raise Exception('Unreachable')
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if __name__ == '__main__':
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import doctest
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doctest.testmod() |