libstdc++: Fix Python deprecation warning in printers.py

python/libstdcxx/v6/printers.py:1355: DeprecationWarning: 'count' is passed as positional argument

The Python docs say:

  Deprecated since version 3.13: Passing count and flags as positional
  arguments is deprecated. In future Python versions they will be
  keyword-only parameters.

Using a keyword argument for count only became possible with Python 3.1
so introduce a new function to do the substitution.

libstdc++-v3/ChangeLog:

	* python/libstdcxx/v6/printers.py (strip_fundts_namespace): New.
	(StdExpAnyPrinter, StdExpOptionalPrinter): Use it.

diff --git a/libstdc++-v3/python/libstdcxx/v6/printers.py b/libstdc++-v3/python/libstdcxx/v6/printers.py
index 9210493786276b64baf9c53a431db0b04a19f11a..d05b79762fddedb3eb8bba522789c1ffd566e848 100644 (file)
--- a/libstdc++-v3/python/libstdcxx/v6/printers.py
+++ b/libstdc++-v3/python/libstdcxx/v6/printers.py
@@ -220,6 +220,16 @@ def strip_versioned_namespace(typename):
     return typename.replace(_versioned_namespace, '')
 
 
+def strip_fundts_namespace(typ):
+    """Remove "fundamentals_vN" inline namespace from qualified type name."""
+    pattern = r'^std::experimental::fundamentals_v\d::'
+    repl = 'std::experimental::'
+    if sys.version_info[0] == 2:
+        return re.sub(pattern, repl, typ, 1)
+    else: # Technically this needs Python 3.1 but nobody should be using 3.0
+        return re.sub(pattern, repl, typ, count=1)
+
+
 def strip_inline_namespaces(type_str):
     """Remove known inline namespaces from the canonical name of a type."""
     type_str = strip_versioned_namespace(type_str)
@@ -1355,8 +1365,7 @@ class StdExpAnyPrinter(SingleObjContainerPrinter):
 
     def __init__(self, typename, val):
         self._typename = strip_versioned_namespace(typename)
-        self._typename = re.sub(r'^std::experimental::fundamentals_v\d::',
-                                'std::experimental::', self._typename, 1)
+        self._typename = strip_fundts_namespace(self._typename)
         self._val = val
         self._contained_type = None
         contained_value = None
@@ -1449,10 +1458,8 @@ class StdExpOptionalPrinter(SingleObjContainerPrinter):
     """Print a std::optional or std::experimental::optional."""
 
     def __init__(self, typename, val):
-        typename = strip_versioned_namespace(typename)
-        self._typename = re.sub(
-            r'^std::(experimental::|)(fundamentals_v\d::|)(.*)',
-            r'std::\1\3', typename, 1)
+        self._typename = strip_versioned_namespace(typename)
+        self._typename = strip_fundts_namespace(self._typename)
         payload = val['_M_payload']
         if self._typename.startswith('std::experimental'):
             engaged = val['_M_engaged']