Start MOMonomial class

mapytex/calculus/core/MO/monomial.py

@@ -0,0 +1,85 @@
+#! /usr/bin/env python
+# -*- coding: utf-8 -*-
+# vim:fenc=utf-8
+#
+# Copyright © 2017 lafrite <lafrite@Poivre>
+#
+# Distributed under terms of the MIT license.
+
+from mapytex.calculus.core.tree import Tree
+from .mo import MO, MOnumber, MOstr
+from .exceptions import MOError
+
+__all__ = ["MOMonomial"]
+
+class MOMonomial(MO):
+
+    """ Monomial math object"""
+
+    def __init__(self, coefficient, variable, power = 1):
+        """ Initiate the MOMonomial
+
+        :param coefficient: coefficient of the monomial (a non zero constant)
+        :param variable: varaible of the monomial (a MOstr or later a MOSqrt)
+        :param power: non negative interger (MOnumber type)
+
+        >>> MOMonomial(4, "x", 2)
+        <MOMonomial 4x^2>
+        >>> MOMonomial(4, "x", 1)
+        <MOMonomial 4x>
+        >>> MOMonomial(4, 3, 1)
+        Traceback (most recent call last):
+            ...
+        mapytex.calculus.core.MO.exceptions.MOError: The variable of a monomial should be convertible into MOstr
+        >>> MOMonomial(4, "x", 0)
+        Traceback (most recent call last):
+            ...
+        mapytex.calculus.core.MO.exceptions.MOError: The power of a monomial should be greater than 0
+        >>> MOMonomial(4, "x", -2)
+        Traceback (most recent call last):
+            ...
+        mapytex.calculus.core.MO.exceptions.MOError: The power of a monomial should be greater than 0
+        >>> MOMonomial(4, "x", 2.4)
+        Traceback (most recent call last):
+            ...
+        mapytex.calculus.core.MO.exceptions.MOError: The power of a monomial should be a integer
+        >>> MOMonomial(0, "x", 1)
+        Traceback (most recent call last):
+            ...
+        mapytex.calculus.core.MO.exceptions.MOError: The coefficient of a monomial should not be 0
+        """
+        _coefficient = MO.factory(coefficient)
+        if coefficient == 0:
+            raise MOError("The coefficient of a monomial should not be 0")
+        self._coefficient = _coefficient
+
+        _variable = MO.factory(variable)
+        if not isinstance(_variable, MOstr):
+            raise MOError("The variable of a monomial should be convertible into MOstr")
+        self._variable = _variable
+
+        _power = MO.factory(power)
+        if power <= 0:
+            raise MOError("The power of a monomial should be greater than 0")
+        elif not isinstance(_power.value, int):
+            raise MOError("The power of a monomial should be a integer")
+        self._power = _power
+
+        if self._power > 1:
+            self.value = Tree("*",
+                    self._coefficient,
+                    Tree("^",
+                        self._variable,
+                        self._power
+                        )
+                    )
+        else:
+            self.value = Tree("*",
+                    self._coefficient,
+                    self._variable,
+                    )
+
+# -----------------------------
+# Reglages pour 'vim'
+# vim:set autoindent expandtab tabstop=4 shiftwidth=4:
+# cursor: 16 del