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Add _PyUnicodeWriter_WriteSubstring() function

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Write a function to enable more optimizations:

 * If the substring is the whole string and overallocation is disabled, just
   keep a reference to the string, don't copy characters
 * Avoid a call to the expensive _PyUnicode_FindMaxChar() function when
   possible
This commit is contained in:
Victor Stinner 2013-04-03 01:48:39 +02:00
parent 4489e927a6
commit cfc4c13b04
4 changed files with 57 additions and 21 deletions
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9
Include/unicodeobject.h
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@ -940,6 +940,15 @@ _PyUnicodeWriter_WriteStr(_PyUnicodeWriter *writer,
PyObject *str /* Unicode string */
);
/* Append a substring of a Unicode string.
Return 0 on success, raise an exception and return -1 on error. */
PyAPI_FUNC(int)
_PyUnicodeWriter_WriteSubstring(_PyUnicodeWriter *writer,
PyObject *str, /* Unicode string */
Py_ssize_t start,
Py_ssize_t end
);
/* Append a latin1-encoded byte string.
Return 0 on success, raise an exception and return -1 on error. */
PyAPI_FUNC(int)