[Ironpython-users] IronPython, Daily Digest 9/19/2012

[no_reply at codeplex.com]

Hi ironpython,

Here's your Daily Digest of new issues for project "IronPython".

In today's digest:ISSUES

1. [New issue] boolean type from databinding is not json compatible
2. [New issue] Lower casing non-ASCII characters does not work
3. [New comment] Lower casing non-ASCII characters does not work
4. [New comment] Lower casing non-ASCII characters does not work

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ISSUES

1. [New issue] boolean type from databinding is not json compatible
http://ironpython.codeplex.com/workitem/33134
User barbar01 has proposed the issue:

"You have to cast explicit with bool(a) if a is a boolean set by databinding.
json.dumps(a) would create a small written "true","false" which json could not reload."-----------------

2. [New issue] Lower casing non-ASCII characters does not work
http://ironpython.codeplex.com/workitem/33133
User pekkaklarck has proposed the issue:

"Interestingly upper() works but lower() doesn't. Tested with some Scandinavian letters but not with other scripts.

To reproduce:

IronPython 2.7.3 (2.7.0.40) on .NET 4.0.30319.269 (32-bit)
Type "help", "copyright", "credits" or "license" for more information.
>>> a = u'\xe4'   # Character 'ä'
>>> A = a.upper()
>>> A
u'\xc4'    # Correctly produces 'Ä'
>>> a.islower()
True
>>> A.islower()
False
>>> A.lower()
u'\xc4'     # Wrong! Still 'Ä'
>>> A.lower() == a
False
>>> A.lower() == A
True"-----------------

3. [New comment] Lower casing non-ASCII characters does not work
http://ironpython.codeplex.com/workitem/33133
User pekkaklarck has commented on the issue:

"Very interestingly swapcase() works:

>>> a = u'\xe4'
>>> A = a.upper()
>>> A.swapcase() == a
True
>>> a.swapcase() == A
True

This allowed me to create the following workaround function:

    def lower(string):
        return ''.join(c if not c.isupper() else c.swapcase() for c in string)
"-----------------

4. [New comment] Lower casing non-ASCII characters does not work
http://ironpython.codeplex.com/workitem/33133
User pekkaklarck has commented on the issue:

"My workaround function was unfortunately slow but could luckily be optimized in common case (including when not running on IronPython). Here's the final code:


if sys.platform != 'cli':

    def lower(string):
        return string.lower()

else:

    def lower(string):
        if string.islower():
            return string
        if not _has_non_ascii_chars(string):
            return string.lower()
        return ''.join(c if not c.isupper() else c.swapcase() for c in string)

    def _has_non_ascii_chars(string):
        for c in string:
            if c >= u'\x80':
                return True
        return False
"
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