get the symtable module back in working order

- Fix broken functions
- Add (hopefully) extensive tests
- Modernize a little

1 files changed, 160 insertions, 20 deletions

diff --git a/Lib/test/test_symtable.py b/Lib/test/test_symtable.py
index 74a7c85..fc678a8 100644
--- a/Lib/test/test_symtable.py
+++ b/Lib/test/test_symtable.py
@@ -1,31 +1,171 @@
-from test import test_support
-
+"""
+Test the API of the symtable module.
+"""
 import symtable
 import unittest
+import warnings
+
+from test import test_support
+
+
+TEST_CODE = """
+import sys
+
+glob = 42
+
+class Mine:
+    instance_var = 24
+    def a_method(p1, p2):
+        pass
 
+def spam(a, b, *var, **kw):
+    global bar
+    bar = 47
+    x = 23
+    glob
+    def internal():
+        return x
+    return internal
 
-## XXX
-## Test disabled because symtable module needs to be rewritten for new compiler
+def foo():
+    exec 'm'
+    from sys import *
 
-##vereq(symbols[0].name, "global")
-##vereq(len([ste for ste in symbols.values() if ste.name == "f"]), 1)
+def namespace_test(): pass
+def namespace_test(): pass
+"""
+
+
+def find_block(block, name):
+    for ch in block.get_children():
+        if ch.get_name() == name:
+            return ch
 
-### Bug tickler: SyntaxError file name correct whether error raised
-### while parsing or building symbol table.
-##def checkfilename(brokencode):
-##    try:
-##        _symtable.symtable(brokencode, "spam", "exec")
-##    except SyntaxError, e:
-##        vereq(e.filename, "spam")
-##    else:
-##        raise TestFailed("no SyntaxError for %r" % (brokencode,))
-##checkfilename("def f(x): foo)(")  # parse-time
-##checkfilename("def f(x): global x")  # symtable-build-time
 
 class SymtableTest(unittest.TestCase):
-    def test_invalid_args(self):
-        self.assertRaises(TypeError, symtable.symtable, "42")
-        self.assertRaises(ValueError, symtable.symtable, "42", "?", "")
+
+    with test_support.catch_warning(record=False):
+        # Ignore warnings about "from blank import *"
+        warnings.simplefilter("ignore", SyntaxWarning)
+        top = symtable.symtable(TEST_CODE, "?", "exec")
+    # These correspond to scopes in TEST_CODE
+    Mine = find_block(top, "Mine")
+    a_method = find_block(Mine, "a_method")
+    spam = find_block(top, "spam")
+    internal = find_block(spam, "internal")
+    foo = find_block(top, "foo")
+
+    def test_type(self):
+        self.assertEqual(self.top.get_type(), "module")
+        self.assertEqual(self.Mine.get_type(), "class")
+        self.assertEqual(self.a_method.get_type(), "function")
+        self.assertEqual(self.spam.get_type(), "function")
+        self.assertEqual(self.internal.get_type(), "function")
+
+    def test_optimized(self):
+        self.assertFalse(self.top.is_optimized())
+        self.assertFalse(self.top.has_exec())
+        self.assertFalse(self.top.has_import_star())
+
+        self.assertTrue(self.spam.is_optimized())
+
+        self.assertFalse(self.foo.is_optimized())
+        self.assertTrue(self.foo.has_exec())
+        self.assertTrue(self.foo.has_import_star())
+
+    def test_nested(self):
+        self.assertFalse(self.top.is_nested())
+        self.assertFalse(self.Mine.is_nested())
+        self.assertFalse(self.spam.is_nested())
+        self.assertTrue(self.internal.is_nested())
+
+    def test_children(self):
+        self.assertTrue(self.top.has_children())
+        self.assertTrue(self.Mine.has_children())
+        self.assertFalse(self.foo.has_children())
+
+    def test_lineno(self):
+        self.assertEqual(self.top.get_lineno(), 0)
+        self.assertEqual(self.spam.get_lineno(), 11)
+
+    def test_function_info(self):
+        func = self.spam
+        self.assertEqual(func.get_parameters(), ("a", "b", "kw", "var"))
+        self.assertEqual(func.get_locals(),
+                         ("a", "b", "bar", "internal", "kw", "var", "x"))
+        self.assertEqual(func.get_globals(), ("bar", "glob"))
+        self.assertEqual(self.internal.get_frees(), ("x",))
+
+    def test_globals(self):
+        self.assertTrue(self.spam.lookup("glob").is_global())
+        self.assertTrue(self.spam.lookup("bar").is_global())
+        self.assertFalse(self.internal.lookup("x").is_global())
+        self.assertFalse(self.Mine.lookup("instance_var").is_global())
+
+    def test_local(self):
+        self.assertTrue(self.spam.lookup("x").is_local())
+        self.assertFalse(self.internal.lookup("x").is_local())
+
+    def test_referenced(self):
+        self.assertTrue(self.internal.lookup("x").is_referenced())
+        self.assertTrue(self.spam.lookup("internal").is_referenced())
+        self.assertFalse(self.spam.lookup("x").is_referenced())
+
+    def test_parameters(self):
+        for sym in ("a", "var", "kw"):
+            self.assertTrue(self.spam.lookup(sym).is_parameter())
+        self.assertFalse(self.spam.lookup("x").is_parameter())
+
+    def test_symbol_lookup(self):
+        self.assertEqual(len(self.top.get_identifiers()),
+                         len(self.top.get_symbols()))
+
+        self.assertRaises(KeyError, self.top.lookup, "not_here")
+
+    def test_namespaces(self):
+        self.assertTrue(self.top.lookup("Mine").is_namespace())
+        self.assertTrue(self.Mine.lookup("a_method").is_namespace())
+        self.assertTrue(self.top.lookup("spam").is_namespace())
+        self.assertTrue(self.spam.lookup("internal").is_namespace())
+        self.assertTrue(self.top.lookup("namespace_test").is_namespace())
+        self.assertFalse(self.spam.lookup("x").is_namespace())
+
+        self.assert_(self.top.lookup("spam").get_namespace() is self.spam)
+        ns_test = self.top.lookup("namespace_test")
+        self.assertEqual(len(ns_test.get_namespaces()), 2)
+        self.assertRaises(ValueError, ns_test.get_namespace)
+
+    def test_assigned(self):
+        self.assertTrue(self.spam.lookup("x").is_assigned())
+        self.assertTrue(self.spam.lookup("bar").is_assigned())
+        self.assertTrue(self.top.lookup("spam").is_assigned())
+        self.assertTrue(self.Mine.lookup("a_method").is_assigned())
+        self.assertFalse(self.internal.lookup("x").is_assigned())
+
+    def test_imported(self):
+        self.assertTrue(self.top.lookup("sys").is_imported())
+
+    def test_name(self):
+        self.assertEqual(self.top.get_name(), "top")
+        self.assertEqual(self.spam.get_name(), "spam")
+        self.assertEqual(self.spam.lookup("x").get_name(), "x")
+        self.assertEqual(self.Mine.get_name(), "Mine")
+
+    def test_class_info(self):
+        self.assertEqual(self.Mine.get_methods(), ('a_method',))
+
+    def test_filename_correct(self):
+        ### Bug tickler: SyntaxError file name correct whether error raised
+        ### while parsing or building symbol table.
+        def checkfilename(brokencode):
+            try:
+                symtable.symtable(brokencode, "spam", "exec")
+            except SyntaxError as e:
+                self.assertEqual(e.filename, "spam")
+            else:
+                self.fail("no SyntaxError for %r" % (brokencode,))
+        checkfilename("def f(x): foo)(")  # parse-time
+        checkfilename("def f(x): global x")  # symtable-build-time
 
     def test_eval(self):
         symbols = symtable.symtable("42", "?", "eval")