Fix(steps): Typing steps are bypassed

Useless steps where complex objects were built are not shown. I create
a typing function which is called when compute raise
NotImplementedError.

mapytex/calculus/core/typing/__init__.py

@@ -0,0 +1,44 @@
+#! /usr/bin/env python
+# -*- coding: utf-8 -*-
+# vim:fenc=utf-8
+#
+# Copyright © 2017 lafrite <lafrite@Poivre>
+#
+# Distributed under terms of the MIT license.
+
+"""
+Computing with MO
+"""
+
+from .exceptions import TypingError
+# from .add import add
+# from .minus import minus
+# from .multiply import multiply
+from .divide import divide
+
+OPERATIONS = {
+        # "+": add, 
+        # "-": minus, 
+        # "*": multiply,
+        "/": divide,
+        }
+
+def typing(node, left_v, right_v):
+    """ 
+    Typing a try base on his root node
+
+    :example:
+
+    >>> from ..MO.mo import MOnumber
+    """
+    try:
+        operation = OPERATIONS[node]
+    except KeyError:
+        raise TypingError(f"Unknown operation ({node})")
+    return operation(left_v, right_v)
+
+
+# -----------------------------
+# Reglages pour 'vim'
+# vim:set autoindent expandtab tabstop=4 shiftwidth=4:
+# cursor: 16 del

mapytex/calculus/core/typing/divide.py

@@ -0,0 +1,43 @@
+#! /usr/bin/env python
+# -*- coding: utf-8 -*-
+# vim:fenc=utf-8
+#
+# Copyright © 2017 lafrite <lafrite@Poivre>
+#
+# Distributed under terms of the MIT license.
+
+"""
+Typing trees with a divide root
+"""
+
+from multipledispatch import Dispatcher
+from ..MO.mo import MO, MOnumber
+from ..MO.fraction import MOFraction
+
+divide_doc = """ Typing trees a divide root
+
+:param left: left MO
+:param right: right MO
+:returns: Tree or MO
+
+"""
+
+divide = Dispatcher("divide", doc=divide_doc)
+
+@divide.register(MOnumber, MOnumber)
+def monumber_monumber(left, right):
+    """ A divide tree with 2 MOnumbers is a MOFraction
+
+    >>> a = MOnumber(4)
+    >>> b = MOnumber(6)
+    >>> monumber_monumber(a, b)
+    <MOFraction 4 / 6>
+
+    """
+    return MOFraction(left, right)
+
+
+# -----------------------------
+# Reglages pour 'vim'
+# vim:set autoindent expandtab tabstop=4 shiftwidth=4:
+# cursor: 16 del

mapytex/calculus/core/typing/exceptions.py

@@ -0,0 +1,19 @@
+#! /usr/bin/env python
+# -*- coding: utf-8 -*-
+# vim:fenc=utf-8
+#
+# Copyright © 2017 lafrite <lafrite@Poivre>
+#
+# Distributed under terms of the MIT license.
+
+"""
+Exceptions for typing trees 
+"""
+
+class TypingError(Exception):
+    pass
+
+# -----------------------------
+# Reglages pour 'vim'
+# vim:set autoindent expandtab tabstop=4 shiftwidth=4:
+# cursor: 16 del