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allow raw string generation

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lafrite 2014-01-30 09:26:48 +01:00 committed by Lafrite
parent 698fea5c63
commit e669e9707d
1 changed files with 22 additions and 5 deletions
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27
pymath/random_expression.py
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@ -9,15 +9,17 @@ import re
class RdExpression(object): class RdExpression(object):
"""A generator of random expression builder""" """A generator of random expression builder"""
def __init__(self, form, conditions = []): def __init__(self, form, conditions = [], with_Exp = True):
"""Initiate the generator """Initiate the generator
:param form: the form of the expression (/!\ variables need to be in brackets {}) :param form: the form of the expression (/!\ variables need to be in brackets {})
:param conditions: condition on variables (/!\ variables need to be in brackets {}) :param conditions: condition on variables (/!\ variables need to be in brackets {})
:param with_Exp: If True, __call__ return an expression rendered through Expression class. If False, keep form and replace inside.
""" """
self._form = form self._form = form
self._conditions = conditions self._conditions = conditions
self._with_Exp = with_Exp
self._letters = self.get_letters() self._letters = self.get_letters()
self._gene_varia = {} self._gene_varia = {}
self._gene_2replaced= {} self._gene_2replaced= {}
@ -59,10 +61,13 @@ class RdExpression(object):
:returns: an formated random expression :returns: an formated random expression
""" """
return render(self.raw_exp(val_min, val_max).postfix_tokens) if self._with_Exp:
return render(self.raw_exp(val_min, val_max).postfix_tokens)
else:
return self.raw_str(val_min, val_max)
def raw_exp(self, val_min = -10, val_max = 10): def raw_str(self, val_min = -10, val_max = 10):
"""Same as __call_ but returns an Expression object """Return raw string (don't use Expression for rendering or parsing)
:param val_min: minimum value random generation :param val_min: minimum value random generation
:param val_max: maximum value random generation :param val_max: maximum value random generation
@ -76,6 +81,18 @@ class RdExpression(object):
exp = self._form.format(**self._gene_2replaced) exp = self._form.format(**self._gene_2replaced)
return exp
def raw_exp(self, val_min = -10, val_max = 10):
"""Same as raw_str but returns an Expression object
:param val_min: minimum value random generation
:param val_max: maximum value random generation
:returns: an random Expression object
"""
exp = self.raw_str(val_min, val_max)
return Expression(exp) return Expression(exp)
def gene_varia(self, val_min = -10, val_max = 10): def gene_varia(self, val_min = -10, val_max = 10):
@ -126,7 +143,7 @@ if __name__ == '__main__':
form1 = "{a**2}x^2 + {2*a*b}x + {b**2}" form1 = "{a**2}x^2 + {2*a*b}x + {b**2}"
cond1 = [] cond1 = []
rdExp1 = RdExpression(form1, cond1) rdExp1 = RdExpression(form1, cond1, with_Exp = False)
desc_rdExp(rdExp1) desc_rdExp(rdExp1)