- is now a unary operator

mapytex/calculus/core/evaluate.py

@@ -12,6 +12,9 @@ Evaluating a binary tree
 
 from .operator import OPERATORS
 
+class ComputeError(Exception):
+    pass
+
 def compute(node, left_v, right_v):
     """ 
     Computing a node 
@@ -20,22 +23,26 @@ def compute(node, left_v, right_v):
 
     >>> compute("+", 1, 2)
     3
-    >>> compute("-", 1, 2)
-    -1
     >>> compute("-", None, 2)
     -2
-
+    >>> compute("-", 1, 2)
+    Traceback (most recent call last):
+        ...
+    mapytex.calculus.core.evaluate.ComputeError: left_v need to be None for operator with arity 1
     """
     op = OPERATORS[node]
     lv = left_v
     rv = right_v
-    if lv is None:
-        return op["_operate"](rv)()
-    
-    try:
-        return op["operate"](lv)(rv)
-    except NotImplemented:
-        return op["roperate"](rv)(lv)
+    if op['arity'] == 1:
+        if lv is None:
+            return op["operate"](rv)()
+        else:
+            raise ComputeError("left_v need to be None for operator with arity 1")
+    else:
+        try:
+            return op["operate"](lv)(rv)
+        except NotImplemented:
+            return op["roperate"](rv)(lv)
 
 
 

mapytex/calculus/core/operator.py

@@ -6,29 +6,35 @@
 #
 # Distributed under terms of the MIT license.
 
+class OperatorError(Exception):
+    pass
+
 OPERATORS = {
         "+": {'repr': "+",
+            'arity': 2,
             'precedence': 0,
             'operate': lambda x: x.__getattribute__("__add__"),
             'roperate': lambda x: x.__getattribute__("__radd__"),
             },
         "-": {'repr': "-",
+            'arity': 1,
             'precedence': 1,
-            '_operate': lambda x: x.__getattribute__("__neg__"),
-            'operate': lambda x: x.__getattribute__("__sub__"),
-            'roperate': lambda x: x.__getattribute__("__rsub__"),
+            'operate': lambda x: x.__getattribute__("__neg__"),
             },
         "*": {'repr': "*",
+            'arity': 2,
             'precedence': 2,
             'operate': lambda x: x.__getattribute__("__mul__"),
             'roperate': lambda x: x.__getattribute__("__rmul__"),
             },
         "/": {'repr': "/",
+            'arity': 2,
             'precedence': 3,
             'operate': lambda x: x.__getattribute__("__div__"),
             'roperate': lambda x: x.__getattribute__("__rdiv__"),
             },
         "^": {'repr': "^",
+            'arity': 2,
             'precedence': 4,
             'operate': lambda x: x.__getattribute__("__pow__"),
             'roperate': lambda x: x.__getattribute__("__rpow__"),

mapytex/calculus/core/str2.py

@@ -17,6 +17,10 @@ from .operator import is_operator
 
 __all__ = ["str2", ]
 
+class ParsingError(Exception):
+    pass
+
+
 def maybe_it_is(cara):
     """ Return a function which return
 
@@ -417,13 +421,38 @@ def lookforNumbers(target):
     ...    str2list.send(i)
     Traceback (most recent call last):
         ...
-    ValueError: Can't build a number with 2 dots (current is 12.3)
+    mapytex.calculus.core.str2.ParsingError: Can't build a number with 2 dots (current is 12.3)
     >>> str2list = lookforNumbers(list_sink)
     >>> for i in ".34*67":
     ...    a = str2list.send(i)
     Traceback (most recent call last):
         ...
-    ValueError: Can't build a number starting with a dot
+    mapytex.calculus.core.str2.ParsingError: Can't build a number starting with a dot
+
+    >>> str2list = lookforNumbers(list_sink)
+    >>> for i in "12-34":
+    ...    str2list.send(i)
+    >>> a = str2list.throw(STOOOP)
+    >>> print(a)
+    [12, '+', -34]
+    >>> str2list = lookforNumbers(list_sink)
+    >>> for i in "-12+34":
+    ...    str2list.send(i)
+    >>> a = str2list.throw(STOOOP)
+    >>> print(a)
+    [-12, '+', 34]
+    >>> str2list = lookforNumbers(list_sink)
+    >>> for i in "3-1.2":
+    ...    str2list.send(i)
+    >>> a = str2list.throw(STOOOP)
+    >>> print(a)
+    [3, '+', Decimal('-1.2')]
+    >>> str2list = lookforNumbers(list_sink)
+    >>> for i in "3-(1.2)":
+    ...    str2list.send(i)
+    >>> a = str2list.throw(STOOOP)
+    >>> print(a)
+    [3, '+', '-', '(', Decimal('1.2'), ')']
 
     """
     try:
@@ -442,13 +471,21 @@ def lookforNumbers(target):
                 except ValueError:
                     if tok == '.':
                         if "." in current:
-                            raise ValueError(f"Can't build a number with 2 dots (current is {current})")
+                            raise ParsingError(f"Can't build a number with 2 dots (current is {current})")
                         elif len(current) == 0:
-                            raise ValueError(f"Can't build a number starting with a dot")
+                            raise ParsingError(f"Can't build a number starting with a dot")
                         else:
                             current += tok
+                    elif tok == '-':
+                        if len(current) > 0:
+                            target_.send(typifiy_numbers(current))
+                            target_.send('+')
+                        current = tok
                     else:
-                        if current:
+                        if current == '-':
+                            target_.send(current)
+                            current = ""
+                        elif current:
                             target_.send(typifiy_numbers(current))
                             current = ""
                         target_.send(tok)
@@ -552,6 +589,22 @@ def str2(sink):
     >>> t = str2nestedlist(exp)
     >>> print(t)
     [2, '*', 'a', '*', [3, '+', 4]]
+    >>> exp = "-12(3-4)"
+    >>> t = str2nestedlist(exp)
+    >>> print(t)
+    [-12, '*', [3, '+', -4]]
+    >>> exp = "-a(3-4)"
+    >>> t = str2nestedlist(exp)
+    >>> print(t)
+    ['-', 'a', '*', [3, '+', -4]]
+    >>> exp = "3-a"
+    >>> t = str2nestedlist(exp)
+    >>> print(t)
+    [3, '+', '-', 'a']
+    >>> exp = "1-(3+4)"
+    >>> t = str2nestedlist(exp)
+    >>> print(t)
+    [1, '+', '-', [3, '+', 4]]
 
     >>> from .tree import MutableTree
     >>> str2tree = str2(MutableTree.sink)
@@ -587,6 +640,43 @@ def str2(sink):
      > +
      | > 3
      | > 4
+    >>> exp = "-12(3-4)"
+    >>> t = str2tree(exp)
+    >>> print(t)
+    *
+     > -12
+     > +
+     | > 3
+     | > -4
+    >>> exp = "-a(3-4)"
+    >>> t = str2tree(exp)
+    >>> print(t)
+    -
+     > None
+     > *
+     | > a
+     | > +
+     | | > 3
+     | | > -4
+    >>> exp = "3-a"
+    >>> t = str2tree(exp)
+    >>> print(t)
+    +
+     > 3
+     > -
+     | > None
+     | > a
+    >>> exp = "1-(3+4)"
+    >>> t = str2tree(exp)
+    >>> print(t)
+    +
+     > 1
+     > -
+     | > None
+     | > +
+     | | > 3
+     | | > 4
+
     """
     lfop = lookfor(is_operator)
     operator_corout = partial(concurent_broadcast, lookfors = [lfop])

mapytex/calculus/core/tree.py

@@ -607,9 +607,7 @@ class MutableTree(Tree):
         *
          > 4
          > +
-         | > -
-         | | > None
-         | | > 2
+         | > -2
          | > 3
         """
         str2mutTree = str2(cls.sink)