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php-src/ext/intl/grapheme/grapheme_util.c
Stanislav Malyshev 882a89fb22 cleanup some code, improve error handling
2009-12-23 21:41:05 +00:00

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/*
+----------------------------------------------------------------------+
| PHP Version 5 |
+----------------------------------------------------------------------+
| This source file is subject to version 3.01 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http://www.php.net/license/3_01.txt |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Author: Ed Batutis <ed@batutis.com> |
+----------------------------------------------------------------------+
*/
/* {{{ includes */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <php.h>
#include "grapheme.h"
#include "grapheme_util.h"
#include "intl_common.h"
#include <unicode/utypes.h>
#include <unicode/ucol.h>
#include <unicode/ustring.h>
#include <unicode/ubrk.h>
#include "ext/standard/php_string.h"
ZEND_EXTERN_MODULE_GLOBALS( intl )
/* }}} */
/* {{{ grapheme_close_global_iterator - clean up */
void
grapheme_close_global_iterator( TSRMLS_D )
{
UBreakIterator *global_break_iterator = INTL_G( grapheme_iterator );
if ( NULL != global_break_iterator ) {
ubrk_close(global_break_iterator);
}
}
/* }}} */
/* {{{ grapheme_intl_case_fold: convert string to lowercase */
void
grapheme_intl_case_fold(UChar** ptr_to_free, UChar **str, int32_t *str_len, UErrorCode *pstatus )
{
UChar *dest;
int32_t dest_len, size_required;
/* allocate a destination string that is a bit larger than the src, hoping that is enough */
dest_len = (*str_len) + ( *str_len / 10 );
dest = (UChar*) eumalloc(dest_len);
*pstatus = U_ZERO_ERROR;
size_required = u_strFoldCase(dest, dest_len, *str, *str_len, U_FOLD_CASE_DEFAULT, pstatus);
dest_len = size_required;
if ( U_BUFFER_OVERFLOW_ERROR == *pstatus ) {
dest = (UChar*) eurealloc(dest, dest_len);
*pstatus = U_ZERO_ERROR;
size_required = u_strFoldCase(dest, dest_len, *str, *str_len, U_FOLD_CASE_DEFAULT, pstatus);
}
if ( U_FAILURE(*pstatus) ) {
return;
}
if ( NULL != ptr_to_free) {
efree(*ptr_to_free);
*ptr_to_free = dest;
}
*str = dest;
*str_len = dest_len;
return;
}
/* }}} */
/* {{{ grapheme_substr_ascii f='from' - starting point, l='length' */
void
grapheme_substr_ascii(char *str, int str_len, int f, int l, int argc, char **sub_str, int *sub_str_len)
{
*sub_str = NULL;
if (argc > 2) {
if ((l < 0 && -l > str_len)) {
return;
} else if (l > str_len) {
l = str_len;
}
} else {
l = str_len;
}
if (f > str_len || (f < 0 && -f > str_len)) {
return;
}
if (l < 0 && (l + str_len - f) < 0) {
return;
}
/* if "from" position is negative, count start position from the end
* of the string
*/
if (f < 0) {
f = str_len + f;
if (f < 0) {
f = 0;
}
}
/* if "length" position is negative, set it to the length
* needed to stop that many chars from the end of the string
*/
if (l < 0) {
l = (str_len - f) + l;
if (l < 0) {
l = 0;
}
}
if (f >= str_len) {
return;
}
if ((f + l) > str_len) {
l = str_len - f;
}
*sub_str = str + f;
*sub_str_len = l;
return;
}
/* }}} */
/* {{{ grapheme_strrpos_utf16 - strrpos using utf16 */
int
grapheme_strrpos_utf16(unsigned char *haystack, int32_t haystack_len, unsigned char*needle, int32_t needle_len, int32_t offset, int f_ignore_case TSRMLS_DC)
{
UChar *uhaystack, *puhaystack, *uhaystack_end, *uneedle;
int32_t uhaystack_len, uneedle_len;
UErrorCode status;
unsigned char u_break_iterator_buffer[U_BRK_SAFECLONE_BUFFERSIZE];
UBreakIterator* bi = NULL;
int ret_pos, pos;
/* convert the strings to UTF-16. */
uhaystack = NULL;
uhaystack_len = 0;
status = U_ZERO_ERROR;
intl_convert_utf8_to_utf16(&uhaystack, &uhaystack_len, (char *) haystack, haystack_len, &status );
if ( U_FAILURE( status ) ) {
/* Set global error code. */
intl_error_set_code( NULL, status TSRMLS_CC );
/* Set error messages. */
intl_error_set_custom_msg( NULL, "Error converting input string to UTF-16", 0 TSRMLS_CC );
efree( uhaystack );
return -1;
}
if ( f_ignore_case ) {
grapheme_intl_case_fold(&uhaystack, &uhaystack, &uhaystack_len, &status );
}
/* get a pointer to the haystack taking into account the offset */
bi = NULL;
status = U_ZERO_ERROR;
bi = grapheme_get_break_iterator(u_break_iterator_buffer, &status TSRMLS_CC );
puhaystack = grapheme_get_haystack_offset(bi, uhaystack, uhaystack_len, offset);
if ( NULL == puhaystack ) {
intl_error_set( NULL, U_ILLEGAL_ARGUMENT_ERROR, "grapheme_strpos: Offset not contained in string", 1 TSRMLS_CC );
efree( uhaystack );
ubrk_close (bi);
return -1;
}
uneedle = NULL;
uneedle_len = 0;
status = U_ZERO_ERROR;
intl_convert_utf8_to_utf16(&uneedle, &uneedle_len, (char *) needle, needle_len, &status );
if ( U_FAILURE( status ) ) {
/* Set global error code. */
intl_error_set_code( NULL, status TSRMLS_CC );
/* Set error messages. */
intl_error_set_custom_msg( NULL, "Error converting input string to UTF-16", 0 TSRMLS_CC );
efree( uhaystack );
efree( uneedle );
ubrk_close (bi);
return -1;
}
if ( f_ignore_case ) {
grapheme_intl_case_fold(&uneedle, &uneedle, &uneedle_len, &status );
}
ret_pos = -1; /* -1 represents 'not found' */
/* back up until there's needle_len characters to compare */
uhaystack_end = uhaystack + uhaystack_len;
pos = ubrk_last(bi);
puhaystack = uhaystack + pos;
while ( uhaystack_end - puhaystack < uneedle_len ) {
pos = ubrk_previous(bi);
if ( UBRK_DONE == pos ) {
break;
}
puhaystack = uhaystack + pos;
}
/* is there enough haystack left to hold the needle? */
if ( ( uhaystack_end - puhaystack ) < uneedle_len ) {
/* not enough, not found */
goto exit;
}
while ( UBRK_DONE != pos ) {
if (!u_memcmp(uneedle, puhaystack, uneedle_len)) { /* needle_len - 1 in zend memnstr? */
/* does the grapheme in the haystack end at the same place as the last grapheme in the needle? */
if ( ubrk_isBoundary(bi, pos + uneedle_len) ) {
/* found it, get grapheme count offset */
ret_pos = grapheme_count_graphemes(bi, uhaystack, pos);
break;
}
/* set position back */
ubrk_isBoundary(bi, pos);
}
pos = ubrk_previous(bi);
puhaystack = uhaystack + pos;
}
exit:
efree( uhaystack );
efree( uneedle );
ubrk_close (bi);
return ret_pos;
}
/* }}} */
/* {{{ grapheme_strpos_utf16 - strrpos using utf16*/
int
grapheme_strpos_utf16(unsigned char *haystack, int32_t haystack_len, unsigned char*needle, int32_t needle_len, int32_t offset, int32_t *puchar_pos, int f_ignore_case TSRMLS_DC)
{
UChar *uhaystack, *puhaystack, *uneedle;
int32_t uhaystack_len, uneedle_len;
int ret_pos;
unsigned char u_break_iterator_buffer[U_BRK_SAFECLONE_BUFFERSIZE];
UBreakIterator* bi;
UErrorCode status;
*puchar_pos = -1;
/* convert the strings to UTF-16. */
uhaystack = NULL;
uhaystack_len = 0;
status = U_ZERO_ERROR;
intl_convert_utf8_to_utf16(&uhaystack, &uhaystack_len, (char *) haystack, haystack_len, &status );
if ( U_FAILURE( status ) ) {
/* Set global error code. */
intl_error_set_code( NULL, status TSRMLS_CC );
/* Set error messages. */
intl_error_set_custom_msg( NULL, "Error converting input string to UTF-16", 0 TSRMLS_CC );
efree( uhaystack );
return -1;
}
/* get a pointer to the haystack taking into account the offset */
bi = NULL;
status = U_ZERO_ERROR;
bi = grapheme_get_break_iterator(u_break_iterator_buffer, &status TSRMLS_CC );
puhaystack = grapheme_get_haystack_offset(bi, uhaystack, uhaystack_len, offset);
uhaystack_len = (uhaystack_len - ( puhaystack - uhaystack));
if ( NULL == puhaystack ) {
intl_error_set( NULL, U_ILLEGAL_ARGUMENT_ERROR, "grapheme_strpos: Offset not contained in string", 1 TSRMLS_CC );
efree( uhaystack );
ubrk_close (bi);
return -1;
}
if ( f_ignore_case ) {
grapheme_intl_case_fold(&uhaystack, &puhaystack, &uhaystack_len, &status );
}
uneedle = NULL;
uneedle_len = 0;
status = U_ZERO_ERROR;
intl_convert_utf8_to_utf16(&uneedle, &uneedle_len, (char *) needle, needle_len, &status );
if ( U_FAILURE( status ) ) {
/* Set global error code. */
intl_error_set_code( NULL, status TSRMLS_CC );
/* Set error messages. */
intl_error_set_custom_msg( NULL, "Error converting input string to UTF-16", 0 TSRMLS_CC );
efree( uhaystack );
efree( uneedle );
ubrk_close (bi);
return -1;
}
if ( f_ignore_case ) {
grapheme_intl_case_fold(&uneedle, &uneedle, &uneedle_len, &status );
}
ret_pos = grapheme_memnstr_grapheme(bi, puhaystack, uneedle, uneedle_len, puhaystack + uhaystack_len );
*puchar_pos = ubrk_current(bi);
efree( uhaystack );
efree( uneedle );
ubrk_close (bi);
return ret_pos;
}
/* }}} */
/* {{{ grapheme_ascii_check: ASCII check */
int grapheme_ascii_check(const unsigned char *day, int32_t len)
{
int ret_len = len;
while ( len-- ) {
if ( *day++ > 0x7f )
return -1;
}
return ret_len;
}
/* }}} */
/* {{{ grapheme_split_string: find and optionally return grapheme boundaries */
int grapheme_split_string(const UChar *text, int32_t text_length, int boundary_array[], int boundary_array_len TSRMLS_DC )
{
unsigned char u_break_iterator_buffer[U_BRK_SAFECLONE_BUFFERSIZE];
UErrorCode status = U_ZERO_ERROR;
int ret_len, pos;
UBreakIterator* bi;
bi = grapheme_get_break_iterator((void*)u_break_iterator_buffer, &status TSRMLS_CC );
if( U_FAILURE(status) ) {
return -1;
}
ubrk_setText(bi, text, text_length, &status);
pos = 0;
for ( ret_len = 0; pos != UBRK_DONE; ) {
pos = ubrk_next(bi);
if ( pos != UBRK_DONE ) {
if ( NULL != boundary_array && ret_len < boundary_array_len ) {
boundary_array[ret_len] = pos;
}
ret_len++;
}
}
ubrk_close(bi);
return ret_len;
}
/* }}} */
/* {{{ grapheme_count_graphemes */
inline int32_t
grapheme_count_graphemes(UBreakIterator *bi, UChar *string, int32_t string_len)
{
int ret_len = 0;
int pos = 0;
UErrorCode status = U_ZERO_ERROR;
ubrk_setText(bi, string, string_len, &status);
do {
pos = ubrk_next(bi);
if ( UBRK_DONE != pos ) {
ret_len++;
}
} while ( UBRK_DONE != pos );
return ret_len;
}
/* }}} */
/* {{{ grapheme_memnstr_grapheme: find needle in haystack using grapheme boundaries */
inline int32_t
grapheme_memnstr_grapheme(UBreakIterator *bi, UChar *haystack, UChar *needle, int32_t needle_len, UChar *end)
{
UChar *p = haystack;
UChar ne = needle[needle_len-1];
UErrorCode status;
int32_t grapheme_offset;
end -= needle_len;
while (p <= end) {
if ((p = u_memchr(p, *needle, (end-p+1))) && ne == p[needle_len-1]) {
if (!u_memcmp(needle, p, needle_len - 1)) { /* needle_len - 1 works because if needle_len is 1, we've already tested the char */
/* does the grapheme end here? */
status = U_ZERO_ERROR;
ubrk_setText (bi, haystack, (end - haystack) + needle_len, &status);
if ( ubrk_isBoundary (bi, (p - haystack) + needle_len) ) {
/* found it, get grapheme count offset */
grapheme_offset = grapheme_count_graphemes(bi, haystack, (p - haystack));
return grapheme_offset;
}
}
}
if (p == NULL) {
return -1;
}
p++;
}
return -1;
}
/* }}} */
/* {{{ grapheme_memrstr_grapheme: reverse find needle in haystack using grapheme boundaries */
inline void *grapheme_memrchr_grapheme(const void *s, int c, int32_t n)
{
register unsigned char *e;
if (n <= 0) {
return NULL;
}
for (e = (unsigned char *)s + n - 1; e >= (unsigned char *)s; e--) {
if (*e == (unsigned char)c) {
return (void *)e;
}
}
return NULL;
}
/* }}} */
/* {{{ grapheme_get_haystack_offset - bump the haystack pointer based on the grapheme count offset */
UChar *
grapheme_get_haystack_offset(UBreakIterator* bi, UChar *uhaystack, int32_t uhaystack_len, int32_t offset)
{
UErrorCode status;
int32_t pos;
int32_t (*iter_op)(UBreakIterator* bi);
int iter_incr;
if ( NULL != bi ) {
status = U_ZERO_ERROR;
ubrk_setText (bi, uhaystack, uhaystack_len, &status);
}
if ( 0 == offset ) {
return uhaystack;
}
if ( offset < 0 ) {
iter_op = ubrk_previous;
ubrk_last(bi); /* one past the end */
iter_incr = 1;
}
else {
iter_op = ubrk_next;
iter_incr = -1;
}
pos = 0;
while ( pos != UBRK_DONE && offset != 0 ) {
pos = iter_op(bi);
if ( UBRK_DONE != pos ) {
offset += iter_incr;
}
}
if ( offset != 0 ) {
return NULL;
}
return uhaystack + pos;
}
/* }}} */
/* {{{ grapheme_strrpos_ascii: borrowed from the php ext/standard/string.c */
int32_t
grapheme_strrpos_ascii(unsigned char *haystack, int32_t haystack_len, unsigned char *needle, int32_t needle_len, int32_t offset)
{
unsigned char *p, *e;
if (offset >= 0) {
p = haystack + offset;
e = haystack + haystack_len - needle_len;
} else {
p = haystack;
if (needle_len > -offset) {
e = haystack + haystack_len - needle_len;
} else {
e = haystack + haystack_len + offset;
}
}
if (needle_len == 1) {
/* Single character search can shortcut memcmps */
while (e >= p) {
if (*e == *needle) {
return (e - p + (offset > 0 ? offset : 0));
}
e--;
}
return -1;
}
while (e >= p) {
if (memcmp(e, needle, needle_len) == 0) {
return (e - p + (offset > 0 ? offset : 0));
}
e--;
}
return -1;
}
/* }}} */
/* {{{ grapheme_get_break_iterator: get a clone of the global character break iterator */
UBreakIterator*
grapheme_get_break_iterator(void *stack_buffer, UErrorCode *status TSRMLS_DC )
{
int32_t buffer_size;
UBreakIterator *global_break_iterator = INTL_G( grapheme_iterator );
if ( NULL == global_break_iterator ) {
global_break_iterator = ubrk_open(UBRK_CHARACTER,
NULL, /* icu default locale - locale has no effect on this iterator */
NULL, /* text not set in global iterator */
0, /* text length = 0 */
status);
INTL_G(grapheme_iterator) = global_break_iterator;
}
buffer_size = U_BRK_SAFECLONE_BUFFERSIZE;
return ubrk_safeClone(global_break_iterator, stack_buffer, &buffer_size, status);
}
/* }}} */
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* End:
* vim600: fdm=marker
* vim: noet sw=4 ts=4
*/
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