+##############################################################################
+#
+# Copyright (c) 2004 Zope Corporation and Contributors.
+# All Rights Reserved.
+#
+# This software is subject to the provisions of the Zope Public License,
+# Version 2.1 (ZPL). A copy of the ZPL should accompany this distribution.
+# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
+# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
+# FOR A PARTICULAR PURPOSE.
+#
+##############################################################################
+"""Simple wrapper for ICU ucol API
+
+"""
+
+import sys
+
+cdef extern from "unicode/utypes.h":
+
+ cdef enum UErrorCode:
+ U_USING_DEFAULT_WARNING = -127
+ U_USING_FALLBACK_WARNING = -128
+ U_ZERO_ERROR = 0
+ U_ILLEGAL_ARGUMENT_ERROR = 1
+ ctypedef int int32_t
+ ctypedef char uint8_t
+ int U_FAILURE(UErrorCode status)
+
+cdef extern from "unicode/utf.h":
+
+ ctypedef int UChar
+ ctypedef int UChar32
+
+cdef extern from "unicode/ustring.h":
+
+ UChar *u_strFromUTF32(UChar *dest, int32_t destCapacity,
+ int32_t *pDestLength,
+ UChar32 *src, int32_t srcLength,
+ UErrorCode *status)
+
+cdef extern from "unicode/ucol.h":
+
+ ctypedef struct UCollator:
+ pass
+ UCollator *ucol_open(char *locale, UErrorCode *status)
+ void ucol_close(UCollator *collator)
+ int32_t ucol_getSortKey(UCollator *coll,
+ UChar *source, int32_t sourceLength,
+ uint8_t *result,
+ int32_t resultLength
+ )
+ int ucol_strcoll(UCollator *coll,
+ UChar *source, int32_t sourceLength,
+ UChar *target, int32_t targetLength)
+
+cdef extern from "Python.h":
+
+ int PyUnicode_Check(ob)
+ int PyString_Check(ob)
+
+ ctypedef int Py_UNICODE
+ Py_UNICODE *PyUnicode_AS_UNICODE(ob)
+ int PyUnicode_GET_SIZE(ob)
+ char *PyString_AS_STRING(ob)
+
+ void *PyMem_Malloc(int size)
+ void PyMem_Free(void *p)
+ object PyString_FromStringAndSize(char *v, int l)
+
+
+cdef class UCharString:
+ """Wrapper for ICU UChar arrays
+ """
+
+ cdef UChar *data
+ cdef readonly int32_t length
+ cdef readonly object base
+ cdef readonly int need_to_free
+
+ def __cinit__(self, text):
+ cdef int32_t buffsize
+ cdef UErrorCode status
+ cdef Py_UNICODE *str
+ cdef int length
+
+ if not PyUnicode_Check(text):
+ if PyString_Check(text):
+ text = unicode(text)
+ assert PyUnicode_Check(text)
+ else:
+ raise TypeError("Expected unicode string")
+
+ length = PyUnicode_GET_SIZE(text)
+ str = PyUnicode_AS_UNICODE(text)
+
+
+ if sizeof(Py_UNICODE) == 2:
+ self.data = str
+ self.length = length
+ self.base = text
+ self.need_to_free = 0
+ else:
+ buffsize = 2*length + 1
+ self.data = <UChar*>PyMem_Malloc(buffsize*sizeof(UChar))
+ if self.data == NULL:
+ raise MemoryError
+ status = U_ZERO_ERROR
+ u_strFromUTF32(self.data, buffsize, &(self.length),
+ <UChar32*>str, length, &status)
+ assert self.length <= buffsize
+ self.need_to_free = 1
+ if U_FAILURE(status):
+ raise ValueError(
+ "Couldn't convert Python unicode data to ICU unicode data."
+ )
+
+ def __dealloc__(self):
+ if self.need_to_free and self.data != NULL:
+ PyMem_Free(self.data)
+ self.data = NULL
+
+
+cdef class Collator:
+ """Compute a collation key for a unicode string.
+ """
+
+ cdef UCollator *collator
+ cdef readonly object locale
+ cdef readonly int used_default_information
+
+ def __cinit__(self, locale):
+ cdef UCollator *collator
+ cdef UErrorCode status
+
+ if not PyString_Check(locale):
+ raise TypeError("String locale expected")
+
+ status = U_ZERO_ERROR
+ collator = ucol_open(PyString_AS_STRING(locale), &status)
+ if U_FAILURE(status):
+ raise ValueError("Couldn't create a collator")
+ self.collator = collator
+ self.locale = locale
+ if (status == U_USING_DEFAULT_WARNING
+ or status == U_USING_FALLBACK_WARNING):
+ status = U_ILLEGAL_ARGUMENT_ERROR
+ self.used_default_information = status
+
+ def __dealloc__(self):
+ if self.collator != NULL:
+ ucol_close(self.collator)
+
+ def key(self, text):
+ """Compute a collation key for the given unicode text.
+
+ Of course, the key is only valid for the given locale.
+ """
+ cdef char *buffer
+ cdef int32_t bufsize
+ cdef int32_t size
+
+ icutext = UCharString(text)
+ bufsize = (<UCharString>icutext).length*2+10
+
+ # the +1 below is needed to avoid an apprent buffer overflow bug in ICU
+ buffer = <char*>PyMem_Malloc(bufsize +1)
+ if buffer == NULL:
+ raise MemoryError
+ size = ucol_getSortKey(self.collator,
+ (<UCharString>icutext).data,
+ (<UCharString>icutext).length,
+ <uint8_t*>buffer, bufsize)
+ while size > bufsize:
+ bufsize = size
+ PyMem_Free(buffer)
+ buffer = <char*>PyMem_Malloc(bufsize +1) # See above +1
+ if buffer == NULL:
+ raise MemoryError
+ size = ucol_getSortKey(self.collator,
+ (<UCharString>icutext).data,
+ (<UCharString>icutext).length,
+ <uint8_t*>buffer, bufsize)
+
+ result = PyString_FromStringAndSize(buffer, size)
+ PyMem_Free(buffer)
+ return result
+
+ def cmp(self, o1, o2):
+ u1 = UCharString(o1)
+ u2 = UCharString(o2)
+ return ucol_strcoll(
+ self.collator,
+ (<UCharString>u1).data,
+ (<UCharString>u1).length,
+ (<UCharString>u2).data,
+ (<UCharString>u2).length,
+ )
projects / python-collate.git / commitdiff