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Implement isBoundary() for code point iterator.

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This commit is contained in:
Andrei Zmievski 2006-07-07 22:52:26 +00:00
parent 4757c4ce46
commit 73b131869c
1 changed files with 47 additions and 0 deletions
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47
ext/unicode/unicode_iterators.c
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@ -176,6 +176,51 @@ static void text_iter_cp_rewind(text_iter_obj *object, long flags TSRMLS_DC)
object->u.cp.index = 0;
}
static void text_iter_cp_following(text_iter_obj *object, int32_t offset, long flags TSRMLS_DC)
{
}
static zend_bool text_iter_cp_isBoundary(text_iter_obj *object, int32_t offset, long flags TSRMLS_DC)
{
int32_t k;
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.cp.cp_offset == UBRK_DONE) {
object->u.cp.cp_offset = 0;
object->u.cp.offset = 0;
}
/*
* Try to locate the code unit position relative to the last known codepoint
* offset.
*/
k = object->u.cp.offset;
if (offset > object->u.cp.cp_offset) {
U16_FWD_N(object->text, k, object->text_len, offset - object->u.cp.cp_offset);
} else {
U16_BACK_N(object->text, 0, k, object->u.cp.cp_offset - offset);
}
if (k == object->text_len) {
object->u.cp.cp_offset += u_countChar32(object->text + object->u.cp.offset, k - object->u.cp.offset);
} else {
object->u.cp.cp_offset = offset;
}
object->u.cp.offset = k;
/*
* Every codepoint is a boundary.
*/
return TRUE;
}
static text_iter_ops text_iter_cp_ops = {
text_iter_cp_valid,
text_iter_cp_current,
@ -183,6 +228,8 @@ static text_iter_ops text_iter_cp_ops = {
text_iter_cp_offset,
text_iter_cp_next,
text_iter_cp_rewind,
text_iter_cp_following,
text_iter_cp_isBoundary,
};
/* Combining sequence ops */