Mapytex/pymath/calculus/operator/mul.py

#!/usr/bin/env python
# encoding: utf-8


from .operator import Operator, save_mainOp


class Mul(Operator):
    r""" The operator *

    >>> mul = Mul()
    >>> mul
    *
    >>> mul(1, 2)
    2
    >>> mul.__tex__('1','2')
    '1 \\times 2'
    >>> mul.__tex__('2','a')
    '2 a'
    >>> mul.__tex__('1','-2')
    '1 \\times ( -2 )'

    >>> mul.__txt__('1','2')
    '1 * 2'
    >>> mul.__txt__('2','a')
    '2 a'
    >>> mul.__txt__('a','2')
    'a * 2'
    >>> mul.__txt__('1','-2')
    '1 * ( -2 )'
    """

    _CARACT = {
        "operator": "*",
        "name": "mul",
        "priority": 4,
        "arity": 2,
        "actions": ("__mul__", "__rmul__"),
        "txt":  "{op1} * {op2}",
        "tex":  "{op1} \\times {op2}",
    }

    def __init__(self):
        """ Initiate Mul Operator """
        super(Mul, self).__init__(**self._CARACT)

        # TODO: Add self.visibility |sam. nov.  8 17:00:08 CET 2014
        self.visibility = 1

    def is_visible(self, op1, op2):
        """ Tells whether self has to be visible or not

        :param op1: left operande
        :param op2: rigth operande


        >>> m = Mul()
        >>> m.is_visible(2, 3)
        True
        >>> m.is_visible(2, -3)
        True
        >>> m.is_visible(-2, 3)
        True
        >>> m.is_visible('a', 2)
        True
        >>> m.is_visible('(2a + 1)', 2)
        True
        >>> m.is_visible(2, '(-2)')
        True
        >>> m.is_visible(2, '2a')
        True
        >>> m.is_visible(2, '(-2a)')
        True
        >>> m.is_visible(2, '(-2abc)')
        True

        >>> m.is_visible(2, 'a')
        False
        >>> m.is_visible(2, '(2a + 1)')
        False
        >>> m.is_visible('(3x - 1)', '(2a + 1)')
        False
        >>> m.is_visible(2, '(-2x + 1)(3x + 2)')
        False
        """
        # TODO: À finir!!! |lun. mars  9 00:03:40 CET 2015
        if type(op2) == int:
            # op2 est maintenant une chaine de caractères
            return True
        elif op2.isdecimal():
            return True
        elif op2.isalpha():
            return False
        elif op2[0].isdecimal():
            return True
        elif op2[0] == "(" and not ("+" in op2 or "-" in op2[3:]):
            return True
        # Giga bricolage...
        elif "frac" in op2:
            return True
        else:
            return False

    def _render(self, link, *args):

        op1 = self.l_parenthesis(args[0], True)
        op2 = self.r_parenthesis(args[1], True)

        if not self.is_visible(op1, op2):
            ans = "{op1} {op2}".format(op1=op1, op2=op2)
        else:
            ans = link.format(op1=op1, op2=op2)

        ans = save_mainOp(ans, self)
        return ans


# -----------------------------
# Reglages pour 'vim'
# vim:set autoindent expandtab tabstop=4 shiftwidth=4:
# cursor: 16 del