Feat(compute): Start compute with power

mapytex/calculus/core/compute/__init__.py

@@ -12,9 +12,10 @@ Computing with MO
 
 from .exceptions import ComputeError
 from .add import add
+from .divide import divide
 from .minus import minus
 from .multiply import multiply
-from .divide import divide
+from .power import power
 
 from ..MO.mo import MOnumber, MOstr
 from ..MO.fraction import MOFraction
@@ -26,10 +27,11 @@ from tabulate import tabulate
 MOS = [ MOnumber, MOstr, MOFraction, MOstrPower, MOMonomial ]
 
 OPERATIONS = {
-        "+": add, 
+        "+": add,
-        "-": minus, 
+        "-": minus,
         "*": multiply,
         "/": divide,
+        "^": power,
         }
 
 def compute(node, left_v, right_v):

mapytex/calculus/core/compute/power.py

@@ -0,0 +1,91 @@
+#! /usr/bin/env python
+# -*- coding: utf-8 -*-
+# vim:fenc=utf-8
+#
+# Copyright © 2017 lafrite <lafrite@Poivre>
+#
+# Distributed under terms of the MIT license.
+
+"""
+Power with MO
+"""
+
+from multipledispatch import Dispatcher
+from ..tree import Tree
+from ..MO.mo import MO, MOnumber, MOstr
+from ..MO.fraction import MOFraction
+from ..MO.monomial import MOstrPower, MOMonomial
+from .filters import special_case
+
+power_doc = """ Power of MOs
+
+:param left: left MO
+:param right: right MO
+:returns: Tree or MO
+
+"""
+
+power = Dispatcher("power", doc=power_doc)
+
+def power_filter(left, right):
+    """ Automatic power on MO
+
+    :param left: MO
+    :param right: MO
+    :returns: MO if it is a special case, nothing other wise
+
+    >>> a = MOnumber(5)
+    >>> b = MOnumber(1)
+    >>> power(a, b)
+    <MOnumber 5>
+    >>> a = MOnumber(5)
+    >>> b = MOnumber(0)
+    >>> power(a, b)
+    <MOnumber 1>
+    >>> a = MOFraction(1, 2)
+    >>> b = MOnumber(1)
+    >>> power(a, b)
+    <MOFraction 1 / 2>
+    >>> a = MOFraction(1, 2)
+    >>> b = MOnumber(0)
+    >>> power(a, b)
+    <MOnumber 1>
+    """
+    try:
+        if right == 0:
+            return MOnumber(1)
+        elif right == 1:
+            return left
+    except TypeError:
+        pass
+
+@power.register(MOnumber, MOnumber)
+@special_case(power_filter)
+def monumber_monumber(left, right):
+    """ Simply power values
+
+    >>> a = MOnumber(4)
+    >>> b = MOnumber(6)
+    >>> power(a, b)
+    <MOnumber 4096>
+
+    """
+    return MO.factory(left.value ** right.value)
+
+@power.register(MOFraction, MOnumber)
+@special_case(power_filter)
+def mofraction_monumber(left, right):
+    """ Return division Tree with on the numertor MOnumber times numerator of MOFraction
+
+    >>> a = MOFraction(3, 2)
+    >>> b = MOnumber(2)
+    >>> print(power(a, b))
+    """
+    raise NotImplementedError
+
+
+
+# -----------------------------
+# Reglages pour 'vim'
+# vim:set autoindent expandtab tabstop=4 shiftwidth=4:
+# cursor: 16 del