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grapheme_string.c
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/*
+----------------------------------------------------------------------+
| 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: |
| https://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 |
| [email protected] so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Author: Ed Batutis <[email protected]> |
+----------------------------------------------------------------------+
*/
/* {{{ includes */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <php.h>
#include "grapheme.h"
#include "grapheme_util.h"
#include <unicode/utypes.h>
#include <unicode/utf8.h>
#include <unicode/ucol.h>
#include <unicode/ustring.h>
#include <unicode/ubrk.h>
#include <unicode/usearch.h>
/* }}} */
/* {{{ Get number of graphemes in a string */
PHP_FUNCTION(grapheme_strlen)
{
char* string;
size_t string_len;
UChar* ustring = NULL;
int ustring_len = 0;
zend_long ret_len;
UErrorCode status;
ZEND_PARSE_PARAMETERS_START(1, 1)
Z_PARAM_STRING(string, string_len)
ZEND_PARSE_PARAMETERS_END();
ret_len = grapheme_ascii_check((unsigned char *)string, string_len);
if ( ret_len >= 0 )
RETURN_LONG(string_len);
/* convert the string to UTF-16. */
status = U_ZERO_ERROR;
intl_convert_utf8_to_utf16(&ustring, &ustring_len, string, string_len, &status );
if ( U_FAILURE( status ) ) {
/* Set global error code. */
intl_error_set_code( NULL, status );
/* Set error messages. */
intl_error_set_custom_msg( NULL, "Error converting input string to UTF-16", 0 );
if (ustring) {
efree( ustring );
}
RETURN_NULL();
}
ret_len = grapheme_split_string(ustring, ustring_len, NULL, 0 );
if (ustring) {
efree( ustring );
}
if (ret_len >= 0) {
RETVAL_LONG(ret_len);
} else {
RETVAL_FALSE;
}
}
/* }}} */
/* {{{ Find position of first occurrence of a string within another */
PHP_FUNCTION(grapheme_strpos)
{
char *haystack, *needle;
size_t haystack_len, needle_len;
const char *found;
zend_long loffset = 0;
int32_t offset = 0;
size_t noffset = 0;
zend_long ret_pos;
ZEND_PARSE_PARAMETERS_START(2, 3)
Z_PARAM_STRING(haystack, haystack_len)
Z_PARAM_STRING(needle, needle_len)
Z_PARAM_OPTIONAL
Z_PARAM_LONG(loffset)
ZEND_PARSE_PARAMETERS_END();
if ( OUTSIDE_STRING(loffset, haystack_len) ) {
zend_argument_value_error(3, "must be contained in argument #1 ($haystack)");
RETURN_THROWS();
}
/* we checked that it will fit: */
offset = (int32_t) loffset;
noffset = offset >= 0 ? offset : (int32_t)haystack_len + offset;
/* the offset is 'grapheme count offset' so it still might be invalid - we'll check it later */
if (offset >= 0 && grapheme_ascii_check((unsigned char *)haystack, haystack_len) >= 0) {
/* quick check to see if the string might be there
* I realize that 'offset' is 'grapheme count offset' but will work in spite of that
*/
found = php_memnstr(haystack + noffset, needle, needle_len, haystack + haystack_len);
/* if it isn't there the we are done */
if (found) {
RETURN_LONG(found - haystack);
}
RETURN_FALSE;
}
/* do utf16 part of the strpos */
ret_pos = grapheme_strpos_utf16(haystack, haystack_len, needle, needle_len, offset, NULL, 0 /* fIgnoreCase */, 0 /* last */ );
if ( ret_pos >= 0 ) {
RETURN_LONG(ret_pos);
} else {
RETURN_FALSE;
}
}
/* }}} */
/* {{{ Find position of first occurrence of a string within another, ignoring case differences */
PHP_FUNCTION(grapheme_stripos)
{
char *haystack, *needle;
size_t haystack_len, needle_len;
const char *found;
zend_long loffset = 0;
int32_t offset = 0;
zend_long ret_pos;
int is_ascii;
ZEND_PARSE_PARAMETERS_START(2, 3)
Z_PARAM_STRING(haystack, haystack_len)
Z_PARAM_STRING(needle, needle_len)
Z_PARAM_OPTIONAL
Z_PARAM_LONG(loffset)
ZEND_PARSE_PARAMETERS_END();
if ( OUTSIDE_STRING(loffset, haystack_len) ) {
zend_argument_value_error(3, "must be contained in argument #1 ($haystack)");
RETURN_THROWS();
}
/* we checked that it will fit: */
offset = (int32_t) loffset;
/* the offset is 'grapheme count offset' so it still might be invalid - we'll check it later */
is_ascii = ( grapheme_ascii_check((unsigned char*)haystack, haystack_len) >= 0 );
if ( is_ascii ) {
char *haystack_dup, *needle_dup;
int32_t noffset = offset >= 0 ? offset : (int32_t)haystack_len + offset;
needle_dup = estrndup(needle, needle_len);
zend_str_tolower(needle_dup, needle_len);
haystack_dup = estrndup(haystack, haystack_len);
zend_str_tolower(haystack_dup, haystack_len);
found = php_memnstr(haystack_dup + noffset, needle_dup, needle_len, haystack_dup + haystack_len);
efree(haystack_dup);
efree(needle_dup);
if (found) {
RETURN_LONG(found - haystack_dup);
}
/* if needle was ascii too, we are all done, otherwise we need to try using Unicode to see what we get */
if ( grapheme_ascii_check((unsigned char *)needle, needle_len) >= 0 ) {
RETURN_FALSE;
}
}
/* do utf16 part of the strpos */
ret_pos = grapheme_strpos_utf16(haystack, haystack_len, needle, needle_len, offset, NULL, 1 /* fIgnoreCase */, 0 /*last */ );
if ( ret_pos >= 0 ) {
RETURN_LONG(ret_pos);
} else {
RETURN_FALSE;
}
}
/* }}} */
/* {{{ Find position of last occurrence of a string within another */
PHP_FUNCTION(grapheme_strrpos)
{
char *haystack, *needle;
size_t haystack_len, needle_len;
zend_long loffset = 0;
int32_t offset = 0;
zend_long ret_pos;
int is_ascii;
ZEND_PARSE_PARAMETERS_START(2, 3)
Z_PARAM_STRING(haystack, haystack_len)
Z_PARAM_STRING(needle, needle_len)
Z_PARAM_OPTIONAL
Z_PARAM_LONG(loffset)
ZEND_PARSE_PARAMETERS_END();
if ( OUTSIDE_STRING(loffset, haystack_len) ) {
zend_argument_value_error(3, "must be contained in argument #1 ($haystack)");
RETURN_THROWS();
}
/* we checked that it will fit: */
offset = (int32_t) loffset;
/* the offset is 'grapheme count offset' so it still might be invalid - we'll check it later */
is_ascii = grapheme_ascii_check((unsigned char *)haystack, haystack_len) >= 0;
if ( is_ascii ) {
ret_pos = grapheme_strrpos_ascii(haystack, haystack_len, needle, needle_len, offset);
if ( ret_pos >= 0 ) {
RETURN_LONG(ret_pos);
}
/* if the needle was ascii too, we are done */
if ( grapheme_ascii_check((unsigned char *)needle, needle_len) >= 0 ) {
RETURN_FALSE;
}
/* else we need to continue via utf16 */
}
ret_pos = grapheme_strpos_utf16(haystack, haystack_len, needle, needle_len, offset, NULL, 0 /* f_ignore_case */, 1/* last */);
if ( ret_pos >= 0 ) {
RETURN_LONG(ret_pos);
} else {
RETURN_FALSE;
}
}
/* }}} */
/* {{{ Find position of last occurrence of a string within another, ignoring case */
PHP_FUNCTION(grapheme_strripos)
{
char *haystack, *needle;
size_t haystack_len, needle_len;
zend_long loffset = 0;
int32_t offset = 0;
zend_long ret_pos;
int is_ascii;
ZEND_PARSE_PARAMETERS_START(2, 3)
Z_PARAM_STRING(haystack, haystack_len)
Z_PARAM_STRING(needle, needle_len)
Z_PARAM_OPTIONAL
Z_PARAM_LONG(loffset)
ZEND_PARSE_PARAMETERS_END();
if ( OUTSIDE_STRING(loffset, haystack_len) ) {
zend_argument_value_error(3, "must be contained in argument #1 ($haystack)");
RETURN_THROWS();
}
/* we checked that it will fit: */
offset = (int32_t) loffset;
/* the offset is 'grapheme count offset' so it still might be invalid - we'll check it later */
is_ascii = grapheme_ascii_check((unsigned char *)haystack, haystack_len) >= 0;
if ( is_ascii ) {
char *needle_dup, *haystack_dup;
needle_dup = estrndup(needle, needle_len);
zend_str_tolower(needle_dup, needle_len);
haystack_dup = estrndup(haystack, haystack_len);
zend_str_tolower(haystack_dup, haystack_len);
ret_pos = grapheme_strrpos_ascii(haystack_dup, haystack_len, needle_dup, needle_len, offset);
efree(haystack_dup);
efree(needle_dup);
if ( ret_pos >= 0 ) {
RETURN_LONG(ret_pos);
}
/* if the needle was ascii too, we are done */
if ( grapheme_ascii_check((unsigned char *)needle, needle_len) >= 0 ) {
RETURN_FALSE;
}
/* else we need to continue via utf16 */
}
ret_pos = grapheme_strpos_utf16(haystack, haystack_len, needle, needle_len, offset, NULL, 1 /* f_ignore_case */, 1 /*last */);
if ( ret_pos >= 0 ) {
RETURN_LONG(ret_pos);
} else {
RETURN_FALSE;
}
}
/* }}} */
/* {{{ Returns part of a string */
PHP_FUNCTION(grapheme_substr)
{
char *str;
zend_string *u8_sub_str;
UChar *ustr;
size_t str_len;
int32_t ustr_len;
zend_long lstart = 0, length = 0;
int32_t start = 0;
int iter_val;
UErrorCode status;
unsigned char u_break_iterator_buffer[U_BRK_SAFECLONE_BUFFERSIZE];
UBreakIterator* bi = NULL;
int sub_str_start_pos, sub_str_end_pos;
int32_t (*iter_func)(UBreakIterator *);
bool no_length = true;
ZEND_PARSE_PARAMETERS_START(2, 3)
Z_PARAM_STRING(str, str_len)
Z_PARAM_LONG(lstart)
Z_PARAM_OPTIONAL
Z_PARAM_LONG_OR_NULL(length, no_length)
ZEND_PARSE_PARAMETERS_END();
if (lstart < INT32_MIN || lstart > INT32_MAX) {
zend_argument_value_error(2, "is too large");
RETURN_THROWS();
}
start = (int32_t) lstart;
if (no_length) {
length = str_len;
}
if (length < INT32_MIN || length > INT32_MAX) {
zend_argument_value_error(3, "is too large");
RETURN_THROWS();
}
/* the offset is 'grapheme count offset' so it still might be invalid - we'll check it later */
if ( grapheme_ascii_check((unsigned char *)str, str_len) >= 0 ) {
int32_t asub_str_len;
char *sub_str;
grapheme_substr_ascii(str, str_len, start, (int32_t)length, &sub_str, &asub_str_len);
if ( NULL == sub_str ) {
intl_error_set( NULL, U_ILLEGAL_ARGUMENT_ERROR, "grapheme_substr: invalid parameters", 1 );
RETURN_FALSE;
}
RETURN_STRINGL(sub_str, asub_str_len);
}
ustr = NULL;
ustr_len = 0;
status = U_ZERO_ERROR;
intl_convert_utf8_to_utf16(&ustr, &ustr_len, str, str_len, &status);
if ( U_FAILURE( status ) ) {
/* Set global error code. */
intl_error_set_code( NULL, status );
/* Set error messages. */
intl_error_set_custom_msg( NULL, "Error converting input string to UTF-16", 0 );
if (ustr) {
efree( ustr );
}
RETURN_FALSE;
}
bi = grapheme_get_break_iterator((void*)u_break_iterator_buffer, &status );
if( U_FAILURE(status) ) {
RETURN_FALSE;
}
ubrk_setText(bi, ustr, ustr_len, &status);
if ( start < 0 ) {
iter_func = ubrk_previous;
ubrk_last(bi);
iter_val = 1;
}
else {
iter_func = ubrk_next;
iter_val = -1;
}
sub_str_start_pos = 0;
while ( start ) {
sub_str_start_pos = iter_func(bi);
if ( UBRK_DONE == sub_str_start_pos ) {
break;
}
start += iter_val;
}
if (0 != start) {
if (start > 0) {
if (ustr) {
efree(ustr);
}
ubrk_close(bi);
RETURN_EMPTY_STRING();
}
sub_str_start_pos = 0;
ubrk_first(bi);
}
/* OK to convert here since if str_len were big, convert above would fail */
if (length >= (int32_t)str_len) {
/* no length supplied or length is too big, return the rest of the string */
status = U_ZERO_ERROR;
u8_sub_str = intl_convert_utf16_to_utf8(ustr + sub_str_start_pos, ustr_len - sub_str_start_pos, &status);
if (ustr) {
efree( ustr );
}
ubrk_close( bi );
if ( !u8_sub_str ) {
/* Set global error code. */
intl_error_set_code( NULL, status );
/* Set error messages. */
intl_error_set_custom_msg( NULL, "Error converting output string to UTF-8", 0 );
RETURN_FALSE;
}
/* return the allocated string, not a duplicate */
RETVAL_NEW_STR(u8_sub_str);
return;
}
if(length == 0) {
/* empty length - we've validated start, we can return "" now */
if (ustr) {
efree(ustr);
}
ubrk_close(bi);
RETURN_EMPTY_STRING();
}
/* find the end point of the string to return */
if ( length < 0 ) {
iter_func = ubrk_previous;
ubrk_last(bi);
iter_val = 1;
}
else {
iter_func = ubrk_next;
iter_val = -1;
}
sub_str_end_pos = 0;
while ( length ) {
sub_str_end_pos = iter_func(bi);
if ( UBRK_DONE == sub_str_end_pos ) {
break;
}
length += iter_val;
}
ubrk_close(bi);
if ( UBRK_DONE == sub_str_end_pos) {
if (length < 0) {
efree(ustr);
RETURN_EMPTY_STRING();
} else {
sub_str_end_pos = ustr_len;
}
}
if (sub_str_start_pos > sub_str_end_pos) {
efree(ustr);
RETURN_EMPTY_STRING();
}
status = U_ZERO_ERROR;
u8_sub_str = intl_convert_utf16_to_utf8(ustr + sub_str_start_pos, ( sub_str_end_pos - sub_str_start_pos ), &status);
efree( ustr );
if ( !u8_sub_str ) {
/* Set global error code. */
intl_error_set_code( NULL, status );
/* Set error messages. */
intl_error_set_custom_msg( NULL, "Error converting output string to UTF-8", 0 );
RETURN_FALSE;
}
/* return the allocated string, not a duplicate */
RETVAL_NEW_STR(u8_sub_str);
}
/* }}} */
/* {{{ strstr_common_handler */
static void strstr_common_handler(INTERNAL_FUNCTION_PARAMETERS, int f_ignore_case)
{
char *haystack, *needle;
const char *found;
size_t haystack_len, needle_len;
int32_t ret_pos, uchar_pos;
bool part = false;
ZEND_PARSE_PARAMETERS_START(2, 3)
Z_PARAM_STRING(haystack, haystack_len)
Z_PARAM_STRING(needle, needle_len)
Z_PARAM_OPTIONAL
Z_PARAM_BOOL(part)
ZEND_PARSE_PARAMETERS_END();
if ( !f_ignore_case ) {
/* ASCII optimization: quick check to see if the string might be there */
found = php_memnstr(haystack, needle, needle_len, haystack + haystack_len);
/* if it isn't there the we are done */
if ( !found ) {
RETURN_FALSE;
}
/* if it is there, and if the haystack is ascii, we are all done */
if ( grapheme_ascii_check((unsigned char *)haystack, haystack_len) >= 0 ) {
size_t found_offset = found - haystack;
if (part) {
RETURN_STRINGL(haystack, found_offset);
} else {
RETURN_STRINGL(found, haystack_len - found_offset);
}
}
}
/* need to work in utf16 */
ret_pos = grapheme_strpos_utf16(haystack, haystack_len, needle, needle_len, 0, &uchar_pos, f_ignore_case, 0 /*last */ );
if ( ret_pos < 0 ) {
RETURN_FALSE;
}
/* uchar_pos is the 'nth' Unicode character position of the needle */
ret_pos = 0;
U8_FWD_N(haystack, ret_pos, haystack_len, uchar_pos);
if (part) {
RETURN_STRINGL(haystack, ret_pos);
} else {
RETURN_STRINGL(haystack + ret_pos, haystack_len - ret_pos);
}
}
/* }}} */
/* {{{ Finds first occurrence of a string within another */
PHP_FUNCTION(grapheme_strstr)
{
strstr_common_handler(INTERNAL_FUNCTION_PARAM_PASSTHRU, 0 /* f_ignore_case */);
}
/* }}} */
/* {{{ Finds first occurrence of a string within another */
PHP_FUNCTION(grapheme_stristr)
{
strstr_common_handler(INTERNAL_FUNCTION_PARAM_PASSTHRU, 1 /* f_ignore_case */);
}
/* }}} */
/* {{{ grapheme_extract_charcount_iter - grapheme iterator for grapheme_extract MAXCHARS */
static inline int32_t
grapheme_extract_charcount_iter(UBreakIterator *bi, int32_t csize, unsigned char *pstr, int32_t str_len)
{
int pos = 0;
int ret_pos = 0;
int break_pos, prev_break_pos;
int count = 0;
while ( 1 ) {
pos = ubrk_next(bi);
if ( UBRK_DONE == pos ) {
break;
}
for ( break_pos = ret_pos; break_pos < pos; ) {
count++;
prev_break_pos = break_pos;
U8_FWD_1(pstr, break_pos, str_len);
if ( prev_break_pos == break_pos ) {
/* something wrong - malformed utf8? */
csize = 0;
break;
}
}
/* if we are beyond our limit, then the loop is done */
if ( count > csize ) {
break;
}
ret_pos = break_pos;
}
return ret_pos;
}
/* }}} */
/* {{{ grapheme_extract_bytecount_iter - grapheme iterator for grapheme_extract MAXBYTES */
static inline int32_t
grapheme_extract_bytecount_iter(UBreakIterator *bi, int32_t bsize, unsigned char *pstr, int32_t str_len)
{
int pos = 0;
int ret_pos = 0;
while ( 1 ) {
pos = ubrk_next(bi);
if ( UBRK_DONE == pos ) {
break;
}
if ( pos > bsize ) {
break;
}
ret_pos = pos;
}
return ret_pos;
}
/* }}} */
/* {{{ grapheme_extract_count_iter - grapheme iterator for grapheme_extract COUNT */
static inline int32_t
grapheme_extract_count_iter(UBreakIterator *bi, int32_t size, unsigned char *pstr, int32_t str_len)
{
int next_pos = 0;
int ret_pos = 0;
while ( size ) {
next_pos = ubrk_next(bi);
if ( UBRK_DONE == next_pos ) {
break;
}
ret_pos = next_pos;
size--;
}
return ret_pos;
}
/* }}} */
/* {{{ grapheme extract iter function pointer array */
typedef int32_t (*grapheme_extract_iter)(UBreakIterator * /*bi*/, int32_t /*size*/, unsigned char * /*pstr*/, int32_t /*str_len*/);
static const grapheme_extract_iter grapheme_extract_iters[] = {
&grapheme_extract_count_iter,
&grapheme_extract_bytecount_iter,
&grapheme_extract_charcount_iter,
};
/* }}} */
/* {{{ Function to extract a sequence of default grapheme clusters */
PHP_FUNCTION(grapheme_extract)
{
char *str, *pstr;
UText ut = UTEXT_INITIALIZER;
size_t str_len;
zend_long size; /* maximum number of grapheme clusters, bytes, or characters (based on extract_type) to return */
zend_long lstart = 0; /* starting position in str in bytes */
int32_t start = 0;
zend_long extract_type = GRAPHEME_EXTRACT_TYPE_COUNT;
UErrorCode status;
unsigned char u_break_iterator_buffer[U_BRK_SAFECLONE_BUFFERSIZE];
UBreakIterator* bi = NULL;
int ret_pos;
zval *next = NULL; /* return offset of next part of the string */
ZEND_PARSE_PARAMETERS_START(2, 5)
Z_PARAM_STRING(str, str_len)
Z_PARAM_LONG(size)
Z_PARAM_OPTIONAL
Z_PARAM_LONG(extract_type)
Z_PARAM_LONG(lstart)
Z_PARAM_ZVAL(next)
ZEND_PARSE_PARAMETERS_END();
if (lstart < 0) {
lstart += str_len;
}
if ( NULL != next ) {
if ( !Z_ISREF_P(next) ) {
intl_error_set( NULL, U_ILLEGAL_ARGUMENT_ERROR,
"grapheme_extract: 'next' was not passed by reference", 0 );
RETURN_FALSE;
} else {
ZVAL_DEREF(next);
/* initialize next */
zval_ptr_dtor(next);
ZVAL_LONG(next, lstart);
}
}
if ( extract_type < GRAPHEME_EXTRACT_TYPE_MIN || extract_type > GRAPHEME_EXTRACT_TYPE_MAX ) {
zend_argument_value_error(3, "must be one of GRAPHEME_EXTR_COUNT, GRAPHEME_EXTR_MAXBYTES, or GRAPHEME_EXTR_MAXCHARS");
RETURN_THROWS();
}
if ( lstart > INT32_MAX || lstart < 0 || (size_t)lstart >= str_len ) {
intl_error_set( NULL, U_ILLEGAL_ARGUMENT_ERROR, "grapheme_extract: start not contained in string", 0 );
RETURN_FALSE;
}
if (size < 0) {
zend_argument_value_error(2, "must be greater than or equal to 0");
RETURN_THROWS();
}
if (size > INT32_MAX) {
zend_argument_value_error(2, "is too large");
RETURN_THROWS();
}
if (size == 0) {
RETURN_EMPTY_STRING();
}
/* we checked that it will fit: */
start = (int32_t) lstart;
pstr = str + start;
/* just in case pstr points in the middle of a character, move forward to the start of the next char */
if ( !U8_IS_SINGLE(*pstr) && !U8_IS_LEAD(*pstr) ) {
char *str_end = str + str_len;
while ( !U8_IS_SINGLE(*pstr) && !U8_IS_LEAD(*pstr) ) {
pstr++;
start++;
if ( pstr >= str_end ) {
intl_error_set( NULL, U_ILLEGAL_ARGUMENT_ERROR,
"grapheme_extract: invalid input string", 0 );
RETURN_FALSE;
}
}
}
str_len -= (pstr - str);
/* if the string is all ASCII up to size+1 - or str_len whichever is first - then we are done.
(size + 1 because the size-th character might be the beginning of a grapheme cluster)
*/
if ( -1 != grapheme_ascii_check((unsigned char *)pstr, MIN(size + 1, str_len)) ) {
size_t nsize = MIN(size, str_len);
if ( NULL != next ) {
ZVAL_LONG(next, start+nsize);
}
RETURN_STRINGL(pstr, nsize);
}
status = U_ZERO_ERROR;
utext_openUTF8(&ut, pstr, str_len, &status);
if ( U_FAILURE( status ) ) {
/* Set global error code. */
intl_error_set_code( NULL, status );
/* Set error messages. */
intl_error_set_custom_msg( NULL, "Error opening UTF-8 text", 0 );
RETURN_FALSE;
}
bi = NULL;
status = U_ZERO_ERROR;
bi = grapheme_get_break_iterator(u_break_iterator_buffer, &status );
ubrk_setUText(bi, &ut, &status);
/* if the caller put us in the middle of a grapheme, we can't detect it in all cases since we
can't back up. So, we will not do anything. */
/* now we need to find the end of the chunk the user wants us to return */
/* it's ok to convert str_len to in32_t since if it were too big intl_convert_utf8_to_utf16 above would fail */
ret_pos = (*grapheme_extract_iters[extract_type])(bi, size, (unsigned char *)pstr, (int32_t)str_len);
utext_close(&ut);
ubrk_close(bi);
if ( NULL != next ) {
ZVAL_LONG(next, start+ret_pos);
}
RETURN_STRINGL(((char *)pstr), ret_pos);
}
PHP_FUNCTION(grapheme_str_split)
{
char *pstr, *end;
zend_string *str;
zend_long split_len = 1;
unsigned char u_break_iterator_buffer[U_BRK_SAFECLONE_BUFFERSIZE];
UErrorCode ustatus = U_ZERO_ERROR;
int32_t pos, current, i, end_len = 0;
UBreakIterator* bi;
UText *ut = NULL;
ZEND_PARSE_PARAMETERS_START(1, 2)
Z_PARAM_STR(str)
Z_PARAM_OPTIONAL
Z_PARAM_LONG(split_len)
ZEND_PARSE_PARAMETERS_END();
if (split_len <= 0 || split_len > UINT_MAX / 4) {
zend_argument_value_error(2, "must be greater than 0 and less than or equal to %d", UINT_MAX / 4);
RETURN_THROWS();
}
if (ZSTR_LEN(str) == 0) {
RETURN_EMPTY_ARRAY();
}
pstr = ZSTR_VAL(str);
ut = utext_openUTF8(ut, pstr, ZSTR_LEN(str), &ustatus);
if ( U_FAILURE( ustatus ) ) {
/* Set global error code. */
intl_error_set_code( NULL, ustatus );
/* Set error messages. */
intl_error_set_custom_msg( NULL, "Error opening UTF-8 text", 0 );
RETURN_FALSE;
}
bi = NULL;
ustatus = U_ZERO_ERROR;
bi = grapheme_get_break_iterator((void*)u_break_iterator_buffer, &ustatus );
if( U_FAILURE(ustatus) ) {
RETURN_FALSE;
}
ubrk_setUText(bi, ut, &ustatus);
pos = 0;
array_init(return_value);
for (end = pstr, i = 0, current = 0; pos != UBRK_DONE;) {
end_len = pos - current;
pos = ubrk_next(bi);
if (i == split_len - 1) {
if ( pos != UBRK_DONE ) {
add_next_index_stringl(return_value, pstr, pos - current);
end = pstr + pos - current;
i = 0;
}
pstr += pos - current;
current = pos;
} else {
i += 1;
}
}
if (i != 0 && end_len != 0) {
add_next_index_stringl(return_value, end, end_len);
}
utext_close(ut);
ubrk_close(bi);
}
PHP_FUNCTION(grapheme_levenshtein)
{
zend_string *string1, *string2;
zend_long cost_ins = 1;
zend_long cost_rep = 1;
zend_long cost_del = 1;
ZEND_PARSE_PARAMETERS_START(2, 5)
Z_PARAM_STR(string1)
Z_PARAM_STR(string2)
Z_PARAM_OPTIONAL
Z_PARAM_LONG(cost_ins)
Z_PARAM_LONG(cost_rep)
Z_PARAM_LONG(cost_del)
ZEND_PARSE_PARAMETERS_END();
if (cost_ins <= 0 || cost_ins > UINT_MAX / 4) {
zend_argument_value_error(3, "must be greater than 0 and less than or equal to %d", UINT_MAX / 4);
RETURN_THROWS();
}
if (cost_rep <= 0 || cost_rep > UINT_MAX / 4) {
zend_argument_value_error(4, "must be greater than 0 and less than or equal to %d", UINT_MAX / 4);
RETURN_THROWS();
}
if (cost_del <= 0 || cost_del > UINT_MAX / 4) {
zend_argument_value_error(5, "must be greater than 0 and less than or equal to %d", UINT_MAX / 4);
RETURN_THROWS();
}
zend_long c0, c1, c2;
zend_long retval;
size_t i2;
char *pstr1, *pstr2;
UChar *ustring1 = NULL;
UChar *ustring2 = NULL;
int32_t ustring1_len = 0;
int32_t ustring2_len = 0;
UErrorCode ustatus = U_ZERO_ERROR;
/* When all costs are equal, levenshtein fulfills the requirements of a metric, which means
* that the distance is symmetric. If string1 is shorter than string2 we can save memory (and CPU time)
* by having shorter rows (p1 & p2). */
if (ZSTR_LEN(string1) < ZSTR_LEN(string2) && cost_ins == cost_rep && cost_rep == cost_del) {
zend_string *tmp = string1;
string1 = string2;
string2 = tmp;
}
pstr1 = ZSTR_VAL(string1);
pstr2 = ZSTR_VAL(string2);
intl_convert_utf8_to_utf16(&ustring1, &ustring1_len, pstr1, ZSTR_LEN(string1), &ustatus);
if (U_FAILURE(ustatus)) {
intl_error_set_code(NULL, ustatus);
intl_error_set_custom_msg(NULL, "Error converting input string to UTF-16", 0);
efree(ustring1);
RETURN_FALSE;
}
intl_convert_utf8_to_utf16(&ustring2, &ustring2_len, pstr2, ZSTR_LEN(string2), &ustatus);
if (U_FAILURE(ustatus)) {
intl_error_set_code(NULL, ustatus);
intl_error_set_custom_msg(NULL, "Error converting input string to UTF-16", 0);
efree(ustring2);
efree(ustring1);
RETURN_FALSE;
}
UBreakIterator *bi1, *bi2;