Mapytex/pymath/calculus/operator/operator_set.py

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#!/usr/bin/env python
# encoding: utf-8
import types
from .add import Add
from .div import Div
from .mul import Mul
from .par import Par
from .pw import Pw
from .sub import Sub
from .sub1 import Sub1
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from .operator import Operator
class Operator_set(object):
""" Class for sets of operators"""
def __init__(self):
""" Initiate the operator_set """
self._operators = {}
def get_op(self, op, arity = 2):
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r"""Return the corresponding operator
:op: symbole of the op
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:arity: the arity (default is 2)
>>> op = Operator_set()
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>>> op.store_operator(Add())
>>> op.get_op('+')
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+
>>> mul = op.get_op('*')
Traceback (most recent call last):
...
KeyError: '* (arity: 2) is not available'
>>> op.store_operator(Mul())
>>> mul = op.get_op('*')
>>> mul.tex
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'{op1} \\times {op2}'
>>> mul.txt
'{op1} * {op2}'
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>>> op.store_operator(Sub1())
>>> sub1 = op.get_op('-')
Traceback (most recent call last):
...
KeyError: '- (arity: 2) is not available'
>>> sub1 = op.get_op('-', 1)
>>> sub1.tex
'- {op1}'
"""
try:
return getattr(self, self._operators[(op, arity)])
except KeyError:
raise KeyError("{theOp} (arity: {arity}) is not available".format(theOp = op, arity = arity))
def available_op(self):
""" Get the set of available operators strings
>>> op = Operator_set()
>>> op.available_op()
set()
>>> op.store_operator(Add())
>>> '+' in op.available_op()
True
>>> '*' in op.available_op()
False
>>> op.store_operator(Mul())
>>> '*' in op.available_op()
True
"""
return set([i[0] for i in self._operators])
def can_be_operator(cls, symbole):
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r"""
Tell if the symbole can be an operator
>>> op = Operator_set()
>>> op.can_be_operator("+")
False
>>> op.store_operator(Add())
>>> op.can_be_operator("+")
True
"""
if type(symbole) == str:
return symbole in [i[0] for i in cls._operators]
else:
return False
def store_operator(self, operator):
""" Save the operator as a method and
:param operator: the operator (the class) (it will be accessible through .name method name.
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>>> op = Operator_set()
>>> op._operators
{}
>>> op.store_operator(Add())
>>> op._operators
{('+', 2): 'add'}
>>> a = op.add
>>> a
+
>>> a.tex
'{op1} + {op2}'
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>>> op.store_operator("+")
Traceback (most recent call last):
...
ValueError: + is not en Operator it's a <class 'str'>
"""
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if isinstance(operator, Operator):
self._operators[operator.uniq_desc()] = operator.name
setattr(self, operator.name, operator)
else:
raise ValueError("{} is not en Operator it's a {}".format(operator, type(operator)))
op = Operator_set()
op.store_operator(Add())
op.store_operator(Div())
op.store_operator(Mul())
op.store_operator(Par())
op.store_operator(Pw())
op.store_operator(Sub())
op.store_operator(Sub1())
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