On 20/12/2011 09:54, Antoine Pitrou wrote:
Hello,
The include file (unicodeobject.h) seems to imply that some pure ASCII
strings can be non-compact, but I don't understand how that can happen.
If you create a string from Py_UNICODE* or wchar_t* (using the legacy
API), PyUnicode_READY() may create a non-compact but ASCII string.
Such string would be in the following state (extract of unicodeobject.h):
- legacy string, ready:
* structure = PyUnicodeObject structure
* test: !PyUnicode_IS_COMPACT(op) && kind != PyUnicode_WCHAR_KIND
* kind = PyUnicode_1BYTE_KIND, PyUnicode_2BYTE_KIND or
PyUnicode_4BYTE_KIND
* compact = 0
* ready = 1
* data.any is not NULL
* utf8 is shared and utf8_length = length with data.any if
ascii = 1
* utf8_length = 0 if utf8 is NULL
Besides, the following comment also seems wrong:
- compact:
* structure = PyCompactUnicodeObject
* test: PyUnicode_IS_ASCII(op)&& !PyUnicode_IS_COMPACT(op)
I added the "test" lines recently because I always forget how to get the
structure type. The correct test should be:
- compact:
* structure = PyCompactUnicodeObject
* test: PyUnicode_IS_COMPACT(op) && !PyUnicode_IS_ASCII(op)
Victor
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