Use a cloned collator for primary collation

src/calibre/utils/icu.c

@@ -32,18 +32,18 @@ icu_Collator_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
     icu_Collator *self;
     const char *loc;
     UErrorCode status = U_ZERO_ERROR;
+    UCollator *collator;
 
     if (!PyArg_ParseTuple(args, "s", &loc)) return NULL;
+    collator = ucol_open(loc, &status);
+    if (collator == NULL || U_FAILURE(status)) { 
+        PyErr_SetString(PyExc_Exception, "Failed to create collator.");
+        return NULL;
+    }
 
     self = (icu_Collator *)type->tp_alloc(type, 0);
     if (self != NULL) {
-        self->collator = ucol_open(loc, &status);
-        if (self->collator == NULL || U_FAILURE(status)) { 
-            PyErr_SetString(PyExc_Exception, "Failed to create collator.");
-            self->collator = NULL;
-            Py_DECREF(self);
-            return NULL;
-        }
+        self->collator = collator;
         self->contractions = NULL;
     }
 
@@ -302,6 +302,10 @@ icu_Collator_span_contractions(icu_Collator *self, PyObject *args, PyObject *kwa
     return Py_BuildValue("i", uset_span(self->contractions, s, slen, span_type));
 } // }}}
 
+
+static PyObject*
+icu_Collator_clone(icu_Collator *self, PyObject *args, PyObject *kwargs);
+
 static PyMethodDef icu_Collator_methods[] = {
     {"sort_key", (PyCFunction)icu_Collator_sort_key, METH_VARARGS,
      "sort_key(unicode object) -> Return a sort key for the given object as a bytestring. The idea is that these bytestring will sort using the builtin cmp function, just like the original unicode strings would sort in the current locale with ICU."
@@ -323,6 +327,10 @@ static PyMethodDef icu_Collator_methods[] = {
         "span_contractions(src, span_condition) -> returns the length of the initial substring according to span_condition in the set of contractions for this collator. Returns 0 if src does not fit the span_condition. The span_condition can be one of USET_SPAN_NOT_CONTAINED, USET_SPAN_CONTAINED, USET_SPAN_SIMPLE."
     },
 
+    {"clone", (PyCFunction)icu_Collator_clone, METH_VARARGS,
+        "clone() -> returns a clone of this collator."
+    },
+
     {NULL}  /* Sentinel */
 };
 
@@ -390,6 +398,31 @@ static PyTypeObject icu_CollatorType = { // {{{
 
 // }}
 
+// Collator.clone {{{
+static PyObject*
+icu_Collator_clone(icu_Collator *self, PyObject *args, PyObject *kwargs)
+{
+    UCollator *collator;
+    UErrorCode status = U_ZERO_ERROR;
+    int32_t bufsize = -1;
+    icu_Collator *clone;
+
+    collator = ucol_safeClone(self->collator, NULL, &bufsize, &status);
+
+    if (collator == NULL || U_FAILURE(status)) {
+        PyErr_SetString(PyExc_Exception, "Failed to create collator.");
+        return NULL;
+    }
+
+    clone = PyObject_New(icu_Collator, &icu_CollatorType);
+    if (clone == NULL) return PyErr_NoMemory();
+
+    clone->collator = collator;
+    clone->contractions = NULL;
+
+    return (PyObject*) clone;
+
+} // }}}
 
 // }}}
 

src/calibre/utils/icu.py

@@ -12,7 +12,7 @@ from functools import partial
 from calibre.constants import plugins
 from calibre.utils.config_base import tweaks
 
-_icu = _collator = None
+_icu = _collator = _primary_collator = None
 _locale = None
 
 _none = u''
@@ -48,6 +48,12 @@ def load_collator():
             _collator = icu.Collator(get_locale())
     return _collator
 
+def primary_collator():
+    global _primary_collator
+    if _primary_collator is None:
+        _primary_collator = _collator.clone()
+        _primary_collator.strength = _icu.UCOL_PRIMARY
+    return _primary_collator
 
 def py_sort_key(obj):
     if not obj:
@@ -65,18 +71,11 @@ def py_find(pattern, source):
         return pos, len(pattern)
     return -1, -1
 
-def icu_find(collator, pattern, source, strength=None):
-    if strength is not None:
-        ostrength = collator.strength
-        collator.strength = strength
-    try:
+def icu_find(collator, pattern, source):
     try:
         return collator.find(pattern, source)
     except TypeError:
         return collator.find(unicode(pattern), unicode(source))
-    finally:
-        if strength is not None:
-            collator.strength = ostrength
 
 def py_case_sensitive_sort_key(obj):
     if not obj:
@@ -88,18 +87,8 @@ def icu_case_sensitive_sort_key(collator, obj):
         return _none2
     return collator.sort_key(obj)
 
-def icu_strcmp(collator, a, b, strength=None):
-    if strength is not None:
-        ostrength = collator.strength
-        collator.strength = strength
-    try:
-        s = collator.strength
-        if s >= _icu.UCOL_TERTIARY:
-            a, b = lower(a), lower(b)
-        return collator.strcmp(a, b)
-    finally:
-        if strength is not None:
-            collator.strength = ostrength
+def icu_strcmp(collator, a, b):
+    return collator.strcmp(lower(a), lower(b))
 
 def py_strcmp(a, b, strength=None):
     return cmp(a.lower(), b.lower())
@@ -183,14 +172,14 @@ def primary_strcmp(a, b):
     if _icu_not_ok:
         from calibre.utils.filenames import ascii_text
         return py_strcmp(ascii_text(a), ascii_text(b))
-    return icu_strcmp(_collator, a, b, _icu.UCOL_PRIMARY)
+    return primary_collator().strcmp(a, b)
 
 def primary_find(pat, src):
     'find that ignores case and accents on letters'
     if _icu_not_ok:
         from calibre.utils.filenames import ascii_text
         return py_find(ascii_text(pat), ascii_text(src))
-    return icu_find(_collator, pat, src, _icu.UCOL_PRIMARY)
+    return icu_find(primary_collator(), pat, src)
 
 ################################################################################
 
@@ -315,6 +304,18 @@ pêché'''
         print 'Capitalize:', x, '->', 'py:', x.capitalize().encode('utf-8'), 'icu:', capitalize(x).encode('utf-8')
         print
 
+    print '\nTesting primary collation'
+    for k, v in {u'pèché': u'peche', u'flüße':u'flusse'}.iteritems():
+        if primary_strcmp(k, v) != 0:
+            print 'primary_strcmp() failed with %s != %s'%(k, v)
+        if primary_find(v, u' '+k)[0] != 1:
+            print 'primary_find() failed with %s not in %s'%(v, k)
+
+    global _primary_collator
+    _primary_collator = _icu.Collator('es')
+    if primary_strcmp(u'peña', u'pena') == 0:
+        print 'Primary collation in Spanish locale failed'
+
 # }}}
 
 if __name__ == '__main__':