py3kcompat: added a "compatibility layer" for py3k
authorRenato Cunha <renatoc@gmail.com>
Tue, 03 Aug 2010 13:52:48 -0300
changeset 11748 37a70a784397
parent 11747 40d5633889bb
child 11749 e627fef94604
py3kcompat: added a "compatibility layer" for py3k This patch adds some ugly constructs. The first of them is bytesformatter, a function that formats strings like when '%' is called. The main motivation for this function is py3k's strange behavior: >>> 'foo %s' % b'bar' "foo b'bar'" >>> b'foo %s' % b'bar' Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: unsupported operand type(s) for %: 'bytes' and 'bytes' >>> b'foo %s' % 'bar' Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: unsupported operand type(s) for %: 'bytes' and 'str' In other words, if we can't format bytes with bytes, and recall that all mercurial strings will be converted by a fixer, then things will break badly if we don't take a similar approach. The other addition with this patch is that the os.environ dictionary is monkeypatched to have bytes items. Hopefully this won't be needed in the future, as python 3.2 might get a os.environb dictionary that holds bytes items.
contrib/hgfixes/fix_bytes.py
mercurial/py3kcompat.py
--- a/contrib/hgfixes/fix_bytes.py	Tue Aug 03 13:41:47 2010 -0300
+++ b/contrib/hgfixes/fix_bytes.py	Tue Aug 03 13:52:48 2010 -0300
@@ -13,6 +13,7 @@
 # blacklisting some modules inside the fixers. So, this is what I came with.
 
 blacklist = ['mercurial/demandimport.py',
+             'mercurial/py3kcompat.py', # valid python 3 already
              'mercurial/i18n.py',
             ]
 
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mercurial/py3kcompat.py	Tue Aug 03 13:52:48 2010 -0300
@@ -0,0 +1,65 @@
+# py3kcompat.py - compatibility definitions for running hg in py3k
+#
+# Copyright 2010 Renato Cunha <renatoc@gmail.com>
+#
+# This software may be used and distributed according to the terms of the
+# GNU General Public License version 2 or any later version.
+
+import os, builtins
+
+from numbers import Number
+
+def bytesformatter(format, args):
+    '''Custom implementation of a formatter for bytestrings.
+
+    This function currently relias on the string formatter to do the
+    formatting and always returns bytes objects.
+
+    >>> bytesformatter(20, 10)
+    0
+    >>> bytesformatter('unicode %s, %s!', ('string', 'foo'))
+    b'unicode string, foo!'
+    >>> bytesformatter(b'test %s', 'me')
+    b'test me'
+    >>> bytesformatter('test %s', 'me')
+    b'test me'
+    >>> bytesformatter(b'test %s', b'me')
+    b'test me'
+    >>> bytesformatter('test %s', b'me')
+    b'test me'
+    >>> bytesformatter('test %d: %s', (1, b'result'))
+    b'test 1: result'
+    '''
+    # The current implementation just converts from bytes to unicode, do
+    # what's needed and then convert the results back to bytes.
+    # Another alternative is to use the Python C API implementation.
+    if isinstance(format, Number):
+        # If the fixer erroneously passes a number remainder operation to
+        # bytesformatter, we just return the correct operation
+        return format % args
+    if isinstance(format, bytes):
+        format = format.decode('utf-8', 'surrogateescape')
+    if isinstance(args, bytes):
+        args = args.decode('utf-8', 'surrogateescape')
+    if isinstance(args, tuple):
+        newargs = []
+        for arg in args:
+            if isinstance(arg, bytes):
+                arg = arg.decode('utf-8', 'surrogateescape')
+            newargs.append(arg)
+        args = tuple(newargs)
+    ret = format % args
+    return ret.encode('utf-8', 'surrogateescape')
+builtins.bytesformatter = bytesformatter
+
+# Create bytes equivalents for os.environ values
+for key in list(os.environ.keys()):
+    # UTF-8 is fine for us
+    bkey = key.encode('utf-8', 'surrogateescape')
+    bvalue = os.environ[key].encode('utf-8', 'surrogateescape')
+    os.environ[bkey] = bvalue
+
+if __name__ == '__main__':
+    import doctest
+    doctest.testmod()
+