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Implement isBoundary() for combining sequences.

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This commit is contained in:
Andrei Zmievski 2006-07-10 21:42:25 +00:00
parent f2cbf6f950
commit 5f19cb01f6
1 changed files with 49 additions and 2 deletions
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51
ext/unicode/unicode_iterators.c
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@ -448,7 +448,7 @@ static void text_iter_cs_rewind(text_iter_obj *object, long flags TSRMLS_DC)
static void text_iter_cs_following(text_iter_obj *object, int32_t offset, long flags TSRMLS_DC)
{
int32_t k, tmp;
int32_t k;
if (offset < 0) {
offset = 0;
@ -501,7 +501,54 @@ static void text_iter_cs_following(text_iter_obj *object, int32_t offset, long f
static zend_bool text_iter_cs_isBoundary(text_iter_obj *object, int32_t offset, long flags TSRMLS_DC)
{
return 1;
UChar32 cp;
int32_t k, tmp;
zend_bool result;
if (offset < 0) {
offset = 0;
}
/*
* On invalid iterator we always want to start looking for the code unit
* offset from the beginning of the string.
*/
if (object->u.cs.start_cp_offset == UBRK_DONE) {
object->u.cs.start_cp_offset = 0;
object->u.cs.start = 0;
}
/*
* Try to locate the code unit position relative to the last known codepoint
* offset.
*/
k = object->u.cs.start;
if (offset > object->u.cs.start_cp_offset) {
U16_FWD_N(object->text, k, object->text_len, offset - object->u.cs.start_cp_offset);
} else {
U16_BACK_N(object->text, 0, k, object->u.cs.start_cp_offset - offset);
}
/* end of the text is always a boundary */
if (k == object->text_len) {
offset = u_countChar32(object->text, object->text_len);
result = 1;
} else {
/* if the next codepoint is a base character, it's a boundary */
tmp = k;
U16_NEXT(object->text, tmp, object->text_len, cp);
result = (u_getCombiningClass(cp) == 0);
}
if (k == object->u.cs.start) {
return result;
}
object->u.cs.start = k;
object->u.cs.start_cp_offset = offset;
object->u.cs.end = object->u.cs.start;
return result;
}
static text_iter_ops text_iter_cs_ops = {