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Reverse iteration for combining sequences.

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This commit is contained in:
Andrei Zmievski 2006-02-08 00:16:50 +00:00
parent 1a6b00fc01
commit dfd6f3e3b8
1 changed files with 36 additions and 19 deletions
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55
ext/unicode/unicode_iterators.c
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@ -49,16 +49,16 @@ typedef struct {
long flags;
union {
struct {
uint32_t index;
uint32_t offset;
int32_t index;
int32_t offset;
} cp;
struct {
int32_t index;
} cu;
struct {
uint32_t index;
uint32_t start;
uint32_t end;
int32_t index;
int32_t start;
int32_t end;
} cs;
} u;
} text_iter_obj;
@ -200,7 +200,11 @@ static text_iter_ops text_iter_cp_ops = {
static int text_iter_cs_valid(text_iter_obj* object TSRMLS_DC)
{
return (object->u.cs.end <= object->text_len);
if (object->flags & ITER_REVERSE) {
return (object->u.cs.end > 0);
} else {
return (object->u.cs.end <= object->text_len);
}
}
static void text_iter_cs_current(text_iter_obj* object TSRMLS_DC)
@ -223,18 +227,28 @@ static int text_iter_cs_key(text_iter_obj* object TSRMLS_DC)
static void text_iter_cs_next(text_iter_obj* object TSRMLS_DC)
{
UChar32 cp;
uint32_t end;
uint32_t tmp;
object->u.cs.start = object->u.cs.end;
U16_NEXT(object->text, object->u.cs.end, object->text_len, cp);
if (u_getCombiningClass(cp) == 0) {
end = object->u.cs.end;
while (end < object->text_len) {
U16_NEXT(object->text, end, object->text_len, cp);
if (u_getCombiningClass(cp) == 0) {
break;
} else {
object->u.cs.end = end;
if (object->flags & ITER_REVERSE) {
object->u.cs.end = object->u.cs.start;
U16_PREV(object->text, 0, object->u.cs.start, cp);
if (u_getCombiningClass(cp) != 0) {
do {
U16_PREV(object->text, 0, object->u.cs.start, cp);
} while (object->u.cs.start > 0 && u_getCombiningClass(cp) != 0);
}
} else {
object->u.cs.start = object->u.cs.end;
U16_NEXT(object->text, object->u.cs.end, object->text_len, cp);
if (u_getCombiningClass(cp) == 0) {
tmp = object->u.cs.end;
while (tmp < object->text_len) {
U16_NEXT(object->text, tmp, object->text_len, cp);
if (u_getCombiningClass(cp) == 0) {
break;
} else {
object->u.cs.end = tmp;
}
}
}
}
@ -243,8 +257,11 @@ static void text_iter_cs_next(text_iter_obj* object TSRMLS_DC)
static void text_iter_cs_rewind(text_iter_obj *object TSRMLS_DC)
{
object->u.cs.start = 0;
object->u.cs.end = 0;
if (object->flags & ITER_REVERSE) {
object->u.cs.start = object->u.cs.end = object->text_len;
} else {
object->u.cs.start = object->u.cs.end = 0;
}
text_iter_cs_next(object TSRMLS_CC); /* find first sequence */
object->u.cs.index = 0; /* because _next increments index */
}