36 lines
1.2 KiB
Python
36 lines
1.2 KiB
Python
from ..API.expression import Expression
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from .core.random_tree import RandomTree
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DEFAUTL_CONFIG = {
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"rejected": [0, 1],
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"min_max": (-10, 10),
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}
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def expression_generator(template:str, conditions:list[str]=[], global_config:dict={}, configs:dict={}):
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""" Generate a random expression
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:param template: the template of the expression
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:param conditions: conditions on randomly generate variable
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:param global_config: configuration for all variables
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:param configs: configuration for each variables
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:return: Expression or Token generated
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:example:
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>>> e = expression_generator("{a}/{a*k}")
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>>> e # doctest: +SKIP
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<Exp: -3 / -15>
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>>> e = expression_generator("{a}/{a*k} - 3*{b}", configs={'a':{'min_max':(10, 30)}})
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>>> e # doctest: +SKIP
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<Exp: 18 / 108 - 3 * 9>
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>>> e = expression_generator("{a}*x + {b}*x + 3", conditions=["a>b"], global_config={"rejected":[0, 1]})
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>>> print(e) # doctest: +SKIP
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10x - 6x + 3
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>>> ee = e.simplify()
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>>> print(ee) # doctest: +SKIP
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4x + 3
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"""
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rd_tree = RandomTree.from_str(template)
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generated_tree = rd_tree.generate(conditions, dict(DEFAUTL_CONFIG, **global_config), configs)
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return Expression._post_processing(generated_tree)
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