Adding cython v0.20.2 in third-party.

third_party/cython/src/Cython/Compiler/Tests/TestTreeFragment.py

+from Cython.TestUtils import CythonTest
+from Cython.Compiler.TreeFragment import *
+from Cython.Compiler.Nodes import *
+from Cython.Compiler.UtilNodes import *
+import Cython.Compiler.Naming as Naming
+
+class TestTreeFragments(CythonTest):
+
+    def test_basic(self):
+        F = self.fragment(u"x = 4")
+        T = F.copy()
+        self.assertCode(u"x = 4", T)
+
+    def test_copy_is_taken(self):
+        F = self.fragment(u"if True: x = 4")
+        T1 = F.root
+        T2 = F.copy()
+        self.assertEqual("x", T2.stats[0].if_clauses[0].body.lhs.name)
+        T2.stats[0].if_clauses[0].body.lhs.name = "other"
+        self.assertEqual("x", T1.stats[0].if_clauses[0].body.lhs.name)
+
+    def test_substitutions_are_copied(self):
+        T = self.fragment(u"y + y").substitute({"y": NameNode(pos=None, name="x")})
+        self.assertEqual("x", T.stats[0].expr.operand1.name)
+        self.assertEqual("x", T.stats[0].expr.operand2.name)
+        self.assert_(T.stats[0].expr.operand1 is not T.stats[0].expr.operand2)
+
+    def test_substitution(self):
+        F = self.fragment(u"x = 4")
+        y = NameNode(pos=None, name=u"y")
+        T = F.substitute({"x" : y})
+        self.assertCode(u"y = 4", T)
+
+    def test_exprstat(self):
+        F = self.fragment(u"PASS")
+        pass_stat = PassStatNode(pos=None)
+        T = F.substitute({"PASS" : pass_stat})
+        self.assert_(isinstance(T.stats[0], PassStatNode), T)
+
+    def test_pos_is_transferred(self):
+        F = self.fragment(u"""
+        x = y
+        x = u * v ** w
+        """)
+        T = F.substitute({"v" : NameNode(pos=None, name="a")})
+        v = F.root.stats[1].rhs.operand2.operand1
+        a = T.stats[1].rhs.operand2.operand1
+        self.assertEquals(v.pos, a.pos)
+
+    def test_temps(self):
+        TemplateTransform.temp_name_counter = 0
+        F = self.fragment(u"""
+            TMP
+            x = TMP
+        """)
+        T = F.substitute(temps=[u"TMP"])
+        s = T.body.stats
+        self.assert_(isinstance(s[0].expr, TempRefNode))
+        self.assert_(isinstance(s[1].rhs, TempRefNode))
+        self.assert_(s[0].expr.handle is s[1].rhs.handle)
+
+if __name__ == "__main__":
+    import unittest
+    unittest.main()