From: Vivien Maisonneuve <v.maisonneuve@gmail.com>
Date: Mon, 18 Aug 2014 14:55:29 +0000 (+0200)
Subject: Check symbol names
X-Git-Tag: 1.0~63
X-Git-Url: https://svn.cri.ensmp.fr/git/linpy.git/commitdiff_plain/2e558859456a109279713a2cbdd6c48a70a171c6?ds=sidebyside;hp=4e641aa915e5641b9d710187618fd0e3c5c42e18

Check symbol names
---

diff --git a/linpy/linexprs.py b/linpy/linexprs.py
index cf2a980..834c3b4 100644
--- a/linpy/linexprs.py
+++ b/linpy/linexprs.py
@@ -456,8 +456,13 @@ class Symbol(LinExpr):
         """
         if not isinstance(name, str):
             raise TypeError('name must be a string')
+        node = ast.parse(name)
+        try:
+            name = node.body[0].value.id
+        except (AttributeError, SyntaxError):
+            raise SyntaxError('invalid syntax')
         self = object().__new__(cls)
-        self._name = name.strip()
+        self._name = name
         self._coefficients = {self: Fraction(1)}
         self._constant = Fraction(0)
         self._symbols = (self,)
diff --git a/linpy/tests/test_linexprs.py b/linpy/tests/test_linexprs.py
index fb7e4a2..9599d06 100644
--- a/linpy/tests/test_linexprs.py
+++ b/linpy/tests/test_linexprs.py
@@ -214,11 +214,20 @@ class TestSymbol(unittest.TestCase):
         self.y = Symbol('y')
 
     def test_new(self):
-        self.assertEqual(Symbol(' x '), self.x)
+        self.assertEqual(Symbol('x'), self.x)
         with self.assertRaises(TypeError):
             Symbol(self.x)
         with self.assertRaises(TypeError):
             Symbol(1)
+        with self.assertRaises(SyntaxError):
+            Symbol('1')
+        with self.assertRaises(SyntaxError):
+            Symbol('x.1')
+        with self.assertRaises(SyntaxError):
+            Symbol('x 1')
+        Symbol('_')
+        Symbol('_x')
+        Symbol('x_1')
 
     def test_name(self):
         self.assertEqual(self.x.name, 'x')