75 lines
1.6 KiB
Python
75 lines
1.6 KiB
Python
#!/usr/bin/env python
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# encoding: utf-8
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from .operator import Operator
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from ..generic import flatten_list
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class Sub(Operator):
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""" The operator -
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>>> sub = Sub()
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>>> sub
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-
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>>> sub(1, 2)
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-1
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>>> sub.__tex__('1','2')
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'1 - 2'
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>>> sub.__tex__('1','-2')
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'1 - ( -2 )'
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>>> sub.__tex__('-1','2')
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'-1 - 2'
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>>> sub.__txt__('1','2')
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'1 - 2'
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>>> sub.__txt__('1','-2')
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'1 - ( -2 )'
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>>> sub.__txt__('-1','2')
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'-1 - 2'
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"""
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_CARACT = {
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"operator" : "-", \
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"name" : "sub",\
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"priority" : 2, \
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"arity" : 2, \
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"actions" : ("__sub__","__rsub__"), \
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"txt" : "{op1} - {op2}",\
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"tex" : "{op1} - {op2}",\
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}
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def __init__(self):
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""" Initiate Sub Operator """
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super(Sub, self).__init__(**self._CARACT)
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def l_parenthesis(self, op, str_join=False):
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return op
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def r_parenthesis(self, op, str_join=False):
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try:
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if op.mainOp.priority <= self.priority:
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op = flatten_list(["(", op, ")"])
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elif op[0] == '-':
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op = flatten_list(["(", op, ")"])
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except AttributeError:
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# op has not the attribute priority
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try:
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if int(op) < 0:
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op = ['(', op, ')']
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except ValueError:
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pass
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ans = flatten_list([op])
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if str_join:
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ans = ' '.join([str(i) for i in ans])
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return ans
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# -----------------------------
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# Reglages pour 'vim'
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# vim:set autoindent expandtab tabstop=4 shiftwidth=4:
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# cursor: 16 del
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