Update string, test_str* from cpython 3.10.6

RustPython · youknowone · Aug 14, 2022 · Aug 14, 2022 · Aug 14, 2022 · Aug 14, 2022
commit 17e12dea1ec11b871a9e5d3a4a26e2f9ad83fde2
diff --git a/Lib/string.py b/Lib/string.py
@@ -54,30 +54,7 @@ def capwords(s, sep=None):
 
 _sentinel_dict = {}
 
-class _TemplateMetaclass(type):
-    pattern = r"""
-    %(delim)s(?:
-      (?P<escaped>%(delim)s) |   # Escape sequence of two delimiters
-      (?P<named>%(id)s)      |   # delimiter and a Python identifier
-      {(?P<braced>%(bid)s)}  |   # delimiter and a braced identifier
-      (?P<invalid>)              # Other ill-formed delimiter exprs
-    )
-    """
-
-    def __init__(cls, name, bases, dct):
-        super(_TemplateMetaclass, cls).__init__(name, bases, dct)
-        if 'pattern' in dct:
-            pattern = cls.pattern
-        else:
-            pattern = _TemplateMetaclass.pattern % {
-                'delim' : _re.escape(cls.delimiter),
-                'id'    : cls.idpattern,
-                'bid'   : cls.braceidpattern or cls.idpattern,
-                }
-        cls.pattern = _re.compile(pattern, cls.flags | _re.VERBOSE)
-
-
-class Template(metaclass=_TemplateMetaclass):
+class Template:
     """A string class for supporting $-substitutions."""
 
     delimiter = '$'
@@ -89,6 +66,24 @@ class Template(metaclass=_TemplateMetaclass):
     braceidpattern = None
     flags = _re.IGNORECASE
 
+    def __init_subclass__(cls):
+        super().__init_subclass__()
+        if 'pattern' in cls.__dict__:
+            pattern = cls.pattern
+        else:
+            delim = _re.escape(cls.delimiter)
+            id = cls.idpattern
+            bid = cls.braceidpattern or cls.idpattern
+            pattern = fr"""
+            {delim}(?:
+              (?P<escaped>{delim})  |   # Escape sequence of two delimiters
+              (?P<named>{id})       |   # delimiter and a Python identifier
+              {{(?P<braced>{bid})}} |   # delimiter and a braced identifier
+              (?P<invalid>)             # Other ill-formed delimiter exprs
+            )
+            """
+        cls.pattern = _re.compile(pattern, cls.flags | _re.VERBOSE)
+
     def __init__(self, template):
         self.template = template
 
@@ -146,6 +141,9 @@ def convert(mo):
                              self.pattern)
         return self.pattern.sub(convert, self.template)
 
+# Initialize Template.pattern.  __init_subclass__() is automatically called
+# only for subclasses, not for the Template class itself.
+Template.__init_subclass__()
 
 
 ########################################################################

diff --git a/Lib/test/test_strftime.py b/Lib/test/test_strftime.py
@@ -115,7 +115,7 @@ def strftest1(self, now):
         )
 
         for e in expectations:
-            # musn't raise a value error
+            # mustn't raise a value error
             try:
                 result = time.strftime(e[0], now)
             except ValueError as error:

diff --git a/Lib/test/test_string_literals.py b/Lib/test/test_string_literals.py
@@ -63,8 +63,6 @@ def byte(i):
 
 class TestLiterals(unittest.TestCase):
 
-    from test.support.warnings_helper import check_syntax_warning
-
     def setUp(self):
         self.save_path = sys.path[:]
         self.tmpdir = tempfile.mkdtemp()
@@ -133,6 +131,7 @@ def test_eval_str_invalid_escape(self):
         self.assertEqual(w, [])
         self.assertEqual(exc.filename, '<string>')
         self.assertEqual(exc.lineno, 1)
+        self.assertEqual(exc.offset, 1)
 
     # TODO: RUSTPYTHON
     @unittest.expectedFailure