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Diffstat (limited to 'users/wpcarro/scratch/facebook/breakfast-generator.py')
-rw-r--r-- | users/wpcarro/scratch/facebook/breakfast-generator.py | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/users/wpcarro/scratch/facebook/breakfast-generator.py b/users/wpcarro/scratch/facebook/breakfast-generator.py new file mode 100644 index 000000000000..df9b5015ad3a --- /dev/null +++ b/users/wpcarro/scratch/facebook/breakfast-generator.py @@ -0,0 +1,112 @@ +# After being inspired by... +# craftinginterpreters.com/representing-code.html +# ...I'm implementing the breakfast generator that the author describes +# therein. + +import random +import string + +# Breakfast + +def breakfast(): + fn = random.choice([ + lambda: " ".join([protein(), "with", breakfast(), "on the side"]), + lambda: protein(), + lambda: bread(), + ]) + return fn() + +def protein(): + fn = random.choice([ + lambda: " ".join([qualifier(), "crispy", "bacon"]), + lambda: "sausage", + lambda: " ".join([cooking_method(), "sausage"]), + ]) + return fn() + +def qualifier(): + fn = random.choice([ + lambda: "really", + lambda: "super", + lambda: " ".join(["really", qualifier()]), + ]) + return fn() + +def cooking_method(): + return random.choice([ + "scrambled", + "poached", + "fried", + ]) + +def bread(): + return random.choice([ + "toast", + "biscuits", + "English muffin", + ]) + +print(breakfast()) + +# Expression Language + +# Because Python is a strictly evaluated language any functions that are +# mutually recursive won't terminate and will overflow our stack. Therefore, any +# non-terminals expressed in an alternative are wrapped in lambdas as thunks. + +def expression(): + fn = random.choice([ + lambda: literal(), + lambda: binary(), + ]) + return fn() + +def literal(): + return str(random.randint(0, 100)) + +def binary(): + return " ".join([expression(), operator(), expression()]) + +def operator(): + return random.choice(["+", "*"]) + +print(expression()) + +# Lox + +def lox_expression(): + fn = random.choice([ + lambda: lox_literal(), + lambda: lox_unary(), + lambda: lox_binary(), + lambda: lox_grouping(), + ]) + return fn() + +def lox_literal(): + fn = random.choice([ + lambda: str(random.randint(0, 100)), + lambda: lox_string(), + lambda: random.choice(["true", "false"]), + lambda: "nil", + ]) + return fn() + +def lox_string(): + return "\"{}\"".format( + "".join(random.choice(string.ascii_lowercase) + for _ in range(random.randint(0, 25)))) + +def lox_grouping(): + return "(" + lox_expression() + ")" + +def lox_unary(): + return random.choice(["-", "!"]) + lox_expression() + +def lox_binary(): + return lox_expression() + lox_operator() + lox_expression() + +def lox_operator(): + return random.choice(["==", "!=", "<", "<=", ">", ">=", "+", "-", "*", "/"]) + +print(lox_expression()) |