[Python-checkins] cpython: Issue #20111: pathlib.Path.with_suffix() now sanity checks the given suffix.

[antoine.pitrou]

http://hg.python.org/cpython/rev/ef2b2ddd27c8
changeset:   88265:ef2b2ddd27c8
user:        Antoine Pitrou <solipsis at pitrou.net>
date:        Fri Jan 03 00:07:17 2014 +0100
summary:
  Issue #20111: pathlib.Path.with_suffix() now sanity checks the given suffix.

files:
  Lib/pathlib.py           |   6 ++++++
  Lib/test/test_pathlib.py |  20 ++++++++++++++++++++
  Misc/NEWS                |   2 ++
  3 files changed, 28 insertions(+), 0 deletions(-)


diff --git a/Lib/pathlib.py b/Lib/pathlib.py
--- a/Lib/pathlib.py
+++ b/Lib/pathlib.py
@@ -755,6 +755,12 @@
     def with_suffix(self, suffix):
         """Return a new path with the file suffix changed (or added, if none)."""
         # XXX if suffix is None, should the current suffix be removed?
+        drv, root, parts = self._flavour.parse_parts((suffix,))
+        if drv or root or len(parts) != 1:
+            raise ValueError("Invalid suffix %r" % (suffix))
+        suffix = parts[0]
+        if not suffix.startswith('.'):
+            raise ValueError("Invalid suffix %r" % (suffix))
         name = self.name
         if not name:
             raise ValueError("%r has an empty name" % (self,))
diff --git a/Lib/test/test_pathlib.py b/Lib/test/test_pathlib.py
--- a/Lib/test/test_pathlib.py
+++ b/Lib/test/test_pathlib.py
@@ -528,9 +528,16 @@
         self.assertEqual(P('/a/b').with_suffix('.gz'), P('/a/b.gz'))
         self.assertEqual(P('a/b.py').with_suffix('.gz'), P('a/b.gz'))
         self.assertEqual(P('/a/b.py').with_suffix('.gz'), P('/a/b.gz'))
+        # Path doesn't have a "filename" component
         self.assertRaises(ValueError, P('').with_suffix, '.gz')
         self.assertRaises(ValueError, P('.').with_suffix, '.gz')
         self.assertRaises(ValueError, P('/').with_suffix, '.gz')
+        # Invalid suffix
+        self.assertRaises(ValueError, P('a/b').with_suffix, 'gz')
+        self.assertRaises(ValueError, P('a/b').with_suffix, '/')
+        self.assertRaises(ValueError, P('a/b').with_suffix, '/.gz')
+        self.assertRaises(ValueError, P('a/b').with_suffix, 'c/d')
+        self.assertRaises(ValueError, P('a/b').with_suffix, '.c/.d')
 
     def test_relative_to_common(self):
         P = self.cls
@@ -920,10 +927,23 @@
         self.assertEqual(P('c:/a/b').with_suffix('.gz'), P('c:/a/b.gz'))
         self.assertEqual(P('c:a/b.py').with_suffix('.gz'), P('c:a/b.gz'))
         self.assertEqual(P('c:/a/b.py').with_suffix('.gz'), P('c:/a/b.gz'))
+        # Path doesn't have a "filename" component
         self.assertRaises(ValueError, P('').with_suffix, '.gz')
         self.assertRaises(ValueError, P('.').with_suffix, '.gz')
         self.assertRaises(ValueError, P('/').with_suffix, '.gz')
         self.assertRaises(ValueError, P('//My/Share').with_suffix, '.gz')
+        # Invalid suffix
+        self.assertRaises(ValueError, P('c:a/b').with_suffix, 'gz')
+        self.assertRaises(ValueError, P('c:a/b').with_suffix, '/')
+        self.assertRaises(ValueError, P('c:a/b').with_suffix, '\\')
+        self.assertRaises(ValueError, P('c:a/b').with_suffix, 'c:')
+        self.assertRaises(ValueError, P('c:a/b').with_suffix, '/.gz')
+        self.assertRaises(ValueError, P('c:a/b').with_suffix, '\\.gz')
+        self.assertRaises(ValueError, P('c:a/b').with_suffix, 'c:.gz')
+        self.assertRaises(ValueError, P('c:a/b').with_suffix, 'c/d')
+        self.assertRaises(ValueError, P('c:a/b').with_suffix, 'c\\d')
+        self.assertRaises(ValueError, P('c:a/b').with_suffix, '.c/d')
+        self.assertRaises(ValueError, P('c:a/b').with_suffix, '.c\\d')
 
     def test_relative_to(self):
         P = self.cls
diff --git a/Misc/NEWS b/Misc/NEWS
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -44,6 +44,8 @@
 Library
 -------
 
+- Issue #20111: pathlib.Path.with_suffix() now sanity checks the given suffix.
+
 - Fix breakage in TestSuite.countTestCases() introduced by issue #11798.
 
 - Issue #20108: Avoid parameter name clash in inspect.getcallargs().

-- 
Repository URL: http://hg.python.org/cpython