113 lines
2.5 KiB
Python
113 lines
2.5 KiB
Python
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# After being inspired by...
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# craftinginterpreters.com/representing-code.html
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# ...I'm implementing the breakfast generator that the author describes
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# therein.
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import random
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import string
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# Breakfast
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def breakfast():
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fn = random.choice([
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lambda: " ".join([protein(), "with", breakfast(), "on the side"]),
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lambda: protein(),
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lambda: bread(),
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])
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return fn()
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def protein():
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fn = random.choice([
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lambda: " ".join([qualifier(), "crispy", "bacon"]),
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lambda: "sausage",
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lambda: " ".join([cooking_method(), "sausage"]),
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])
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return fn()
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def qualifier():
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fn = random.choice([
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lambda: "really",
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lambda: "super",
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lambda: " ".join(["really", qualifier()]),
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])
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return fn()
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def cooking_method():
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return random.choice([
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"scrambled",
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"poached",
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"fried",
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])
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def bread():
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return random.choice([
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"toast",
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"biscuits",
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"English muffin",
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])
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print(breakfast())
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# Expression Language
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# Because Python is a strictly evaluated language any functions that are
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# mutually recursive won't terminate and will overflow our stack. Therefore, any
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# non-terminals expressed in an alternative are wrapped in lambdas as thunks.
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def expression():
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fn = random.choice([
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lambda: literal(),
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lambda: binary(),
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])
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return fn()
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def literal():
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return str(random.randint(0, 100))
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def binary():
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return " ".join([expression(), operator(), expression()])
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def operator():
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return random.choice(["+", "*"])
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print(expression())
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# Lox
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def lox_expression():
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fn = random.choice([
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lambda: lox_literal(),
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lambda: lox_unary(),
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lambda: lox_binary(),
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lambda: lox_grouping(),
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])
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return fn()
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def lox_literal():
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fn = random.choice([
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lambda: str(random.randint(0, 100)),
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lambda: lox_string(),
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lambda: random.choice(["true", "false"]),
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lambda: "nil",
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])
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return fn()
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def lox_string():
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return "\"{}\"".format(
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"".join(random.choice(string.ascii_lowercase)
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for _ in range(random.randint(0, 25))))
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def lox_grouping():
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return "(" + lox_expression() + ")"
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def lox_unary():
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return random.choice(["-", "!"]) + lox_expression()
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def lox_binary():
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return lox_expression() + lox_operator() + lox_expression()
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def lox_operator():
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return random.choice(["==", "!=", "<", "<=", ">", ">=", "+", "-", "*", "/"])
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print(lox_expression())
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