1 /*
2 +----------------------------------------------------------------------+
3 | PHP Version 7 |
4 +----------------------------------------------------------------------+
5 | This source file is subject to version 3.01 of the PHP license, |
6 | that is bundled with this package in the file LICENSE, and is |
7 | available through the world-wide-web at the following url: |
8 | http://www.php.net/license/3_01.txt |
9 | If you did not receive a copy of the PHP license and are unable to |
10 | obtain it through the world-wide-web, please send a note to |
11 | license@php.net so we can mail you a copy immediately. |
12 +----------------------------------------------------------------------+
13 | Author: Ed Batutis <ed@batutis.com> |
14 +----------------------------------------------------------------------+
15 */
16
17 /* {{{ includes */
18 #ifdef HAVE_CONFIG_H
19 #include "config.h"
20 #endif
21
22 #include <php.h>
23 #include "grapheme.h"
24 #include "grapheme_util.h"
25 #include "intl_common.h"
26
27 #include <unicode/utypes.h>
28 #include <unicode/ucol.h>
29 #include <unicode/ustring.h>
30 #include <unicode/ubrk.h>
31 #include <unicode/usearch.h>
32
33 #include "ext/standard/php_string.h"
34
ZEND_EXTERN_MODULE_GLOBALS(intl)35 ZEND_EXTERN_MODULE_GLOBALS( intl )
36
37 /* }}} */
38
39 /* {{{ grapheme_close_global_iterator - clean up */
40 void
41 grapheme_close_global_iterator( void )
42 {
43 UBreakIterator *global_break_iterator = INTL_G( grapheme_iterator );
44
45 if ( NULL != global_break_iterator ) {
46 ubrk_close(global_break_iterator);
47 }
48 }
49 /* }}} */
50
51 /* {{{ grapheme_substr_ascii f='from' - starting point, l='length' */
grapheme_substr_ascii(char * str,size_t str_len,int32_t f,int32_t l,char ** sub_str,int32_t * sub_str_len)52 void grapheme_substr_ascii(char *str, size_t str_len, int32_t f, int32_t l, char **sub_str, int32_t *sub_str_len)
53 {
54 int32_t str_len2 = (int32_t)str_len; /* in order to avoid signed/unsigned problems */
55 *sub_str = NULL;
56
57 if(str_len > INT32_MAX) {
58 /* We can not return long strings from ICU functions, so we won't here too */
59 return;
60 }
61
62 if ((l < 0 && -l > str_len2)) {
63 return;
64 } else if (l > 0 && l > str_len2) {
65 l = str_len2;
66 }
67
68 if (f > str_len2 || (f < 0 && -f > str_len2)) {
69 return;
70 }
71
72 if (l < 0 && str_len2 < f - l) {
73 return;
74 }
75
76 /* if "from" position is negative, count start position from the end
77 * of the string
78 */
79 if (f < 0) {
80 f = str_len2 + f;
81 if (f < 0) {
82 f = 0;
83 }
84 }
85
86
87 /* if "length" position is negative, set it to the length
88 * needed to stop that many chars from the end of the string
89 */
90 if (l < 0) {
91 l = (str_len2 - f) + l;
92 if (l < 0) {
93 l = 0;
94 }
95 }
96
97 if (f >= str_len2) {
98 return;
99 }
100
101 if ((f + l) > str_len2) {
102 l = str_len - f;
103 }
104
105 *sub_str = str + f;
106 *sub_str_len = l;
107
108 return;
109 }
110 /* }}} */
111
112 #define STRPOS_CHECK_STATUS(status, error) \
113 if ( U_FAILURE( (status) ) ) { \
114 intl_error_set_code( NULL, (status) ); \
115 intl_error_set_custom_msg( NULL, (error), 0 ); \
116 if (uhaystack) { \
117 efree( uhaystack ); \
118 } \
119 if (uneedle) { \
120 efree( uneedle ); \
121 } \
122 if(bi) { \
123 ubrk_close (bi); \
124 } \
125 if(src) { \
126 usearch_close(src); \
127 } \
128 return -1; \
129 }
130
131
132 /* {{{ grapheme_strpos_utf16 - strrpos using utf16*/
grapheme_strpos_utf16(char * haystack,size_t haystack_len,char * needle,size_t needle_len,int32_t offset,int32_t * puchar_pos,int f_ignore_case,int last)133 int32_t grapheme_strpos_utf16(char *haystack, size_t haystack_len, char *needle, size_t needle_len, int32_t offset, int32_t *puchar_pos, int f_ignore_case, int last)
134 {
135 UChar *uhaystack = NULL, *uneedle = NULL;
136 int32_t uhaystack_len = 0, uneedle_len = 0, char_pos, ret_pos, offset_pos = 0;
137 unsigned char u_break_iterator_buffer[U_BRK_SAFECLONE_BUFFERSIZE];
138 UBreakIterator* bi = NULL;
139 UErrorCode status;
140 UStringSearch* src = NULL;
141
142 if(puchar_pos) {
143 *puchar_pos = -1;
144 }
145 /* convert the strings to UTF-16. */
146
147 status = U_ZERO_ERROR;
148 intl_convert_utf8_to_utf16(&uhaystack, &uhaystack_len, haystack, haystack_len, &status );
149 STRPOS_CHECK_STATUS(status, "Error converting input string to UTF-16");
150
151 status = U_ZERO_ERROR;
152 intl_convert_utf8_to_utf16(&uneedle, &uneedle_len, needle, needle_len, &status );
153 STRPOS_CHECK_STATUS(status, "Error converting needle string to UTF-16");
154
155 /* get a pointer to the haystack taking into account the offset */
156 status = U_ZERO_ERROR;
157 bi = grapheme_get_break_iterator(u_break_iterator_buffer, &status );
158 STRPOS_CHECK_STATUS(status, "Failed to get iterator");
159 status = U_ZERO_ERROR;
160 ubrk_setText(bi, uhaystack, uhaystack_len, &status);
161 STRPOS_CHECK_STATUS(status, "Failed to set up iterator");
162
163 status = U_ZERO_ERROR;
164 src = usearch_open(uneedle, uneedle_len, uhaystack, uhaystack_len, "", bi, &status);
165 STRPOS_CHECK_STATUS(status, "Error creating search object");
166
167 if(f_ignore_case) {
168 UCollator *coll = usearch_getCollator(src);
169 status = U_ZERO_ERROR;
170 ucol_setAttribute(coll, UCOL_STRENGTH, UCOL_SECONDARY, &status);
171 STRPOS_CHECK_STATUS(status, "Error setting collation strength");
172 usearch_reset(src);
173 }
174
175 if(offset != 0) {
176 offset_pos = grapheme_get_haystack_offset(bi, offset);
177 if(offset_pos == -1) {
178 status = U_ILLEGAL_ARGUMENT_ERROR;
179 STRPOS_CHECK_STATUS(status, "Invalid search offset");
180 }
181 status = U_ZERO_ERROR;
182 usearch_setOffset(src, offset_pos, &status);
183 STRPOS_CHECK_STATUS(status, "Invalid search offset");
184 }
185
186
187 if(last) {
188 char_pos = usearch_last(src, &status);
189 if(char_pos < offset_pos) {
190 /* last one is beyound our start offset */
191 char_pos = USEARCH_DONE;
192 }
193 } else {
194 char_pos = usearch_next(src, &status);
195 }
196 STRPOS_CHECK_STATUS(status, "Error looking up string");
197 if(char_pos != USEARCH_DONE && ubrk_isBoundary(bi, char_pos)) {
198 ret_pos = grapheme_count_graphemes(bi, uhaystack,char_pos);
199 if(puchar_pos) {
200 *puchar_pos = char_pos;
201 }
202 } else {
203 ret_pos = -1;
204 }
205
206 if (uhaystack) {
207 efree( uhaystack );
208 }
209 if (uneedle) {
210 efree( uneedle );
211 }
212 ubrk_close (bi);
213 usearch_close (src);
214
215 return ret_pos;
216 }
217
218 /* }}} */
219
220 /* {{{ grapheme_ascii_check: ASCII check */
grapheme_ascii_check(const unsigned char * day,size_t len)221 zend_long grapheme_ascii_check(const unsigned char *day, size_t len)
222 {
223 int ret_len = len;
224 while ( len-- ) {
225 if ( *day++ > 0x7f || (*day == '\n' && *(day - 1) == '\r') )
226 return -1;
227 }
228
229 return ret_len;
230 }
231
232 /* }}} */
233
234 /* {{{ grapheme_split_string: find and optionally return grapheme boundaries */
grapheme_split_string(const UChar * text,int32_t text_length,int boundary_array[],int boundary_array_len)235 int32_t grapheme_split_string(const UChar *text, int32_t text_length, int boundary_array[], int boundary_array_len )
236 {
237 unsigned char u_break_iterator_buffer[U_BRK_SAFECLONE_BUFFERSIZE];
238 UErrorCode status = U_ZERO_ERROR;
239 int ret_len, pos;
240 UBreakIterator* bi;
241
242 bi = grapheme_get_break_iterator((void*)u_break_iterator_buffer, &status );
243
244 if( U_FAILURE(status) ) {
245 return -1;
246 }
247
248 ubrk_setText(bi, text, text_length, &status);
249
250 pos = 0;
251
252 for ( ret_len = 0; pos != UBRK_DONE; ) {
253
254 pos = ubrk_next(bi);
255
256 if ( pos != UBRK_DONE ) {
257
258 if ( NULL != boundary_array && ret_len < boundary_array_len ) {
259 boundary_array[ret_len] = pos;
260 }
261
262 ret_len++;
263 }
264 }
265
266 ubrk_close(bi);
267
268 return ret_len;
269 }
270 /* }}} */
271
272 /* {{{ grapheme_count_graphemes */
grapheme_count_graphemes(UBreakIterator * bi,UChar * string,int32_t string_len)273 int32_t grapheme_count_graphemes(UBreakIterator *bi, UChar *string, int32_t string_len)
274 {
275 int ret_len = 0;
276 int pos = 0;
277 UErrorCode status = U_ZERO_ERROR;
278
279 ubrk_setText(bi, string, string_len, &status);
280
281 do {
282
283 pos = ubrk_next(bi);
284
285 if ( UBRK_DONE != pos ) {
286 ret_len++;
287 }
288
289 } while ( UBRK_DONE != pos );
290
291 return ret_len;
292 }
293 /* }}} */
294
295
296 /* {{{ grapheme_get_haystack_offset - bump the haystack pointer based on the grapheme count offset */
grapheme_get_haystack_offset(UBreakIterator * bi,int32_t offset)297 int32_t grapheme_get_haystack_offset(UBreakIterator* bi, int32_t offset)
298 {
299 int32_t pos;
300 int32_t (*iter_op)(UBreakIterator* bi);
301 int iter_incr;
302
303 if ( 0 == offset ) {
304 return 0;
305 }
306
307 if ( offset < 0 ) {
308 iter_op = ubrk_previous;
309 ubrk_last(bi); /* one past the end */
310 iter_incr = 1;
311 }
312 else {
313 iter_op = ubrk_next;
314 iter_incr = -1;
315 }
316
317 pos = 0;
318
319 while ( pos != UBRK_DONE && offset != 0 ) {
320
321 pos = iter_op(bi);
322
323 if ( UBRK_DONE != pos ) {
324 offset += iter_incr;
325 }
326 }
327
328 if ( offset != 0 ) {
329 return -1;
330 }
331
332 return pos;
333 }
334 /* }}} */
335
336 /* {{{ grapheme_strrpos_ascii: borrowed from the php ext/standard/string.c */
337 zend_long
grapheme_strrpos_ascii(char * haystack,size_t haystack_len,char * needle,size_t needle_len,int32_t offset)338 grapheme_strrpos_ascii(char *haystack, size_t haystack_len, char *needle, size_t needle_len, int32_t offset)
339 {
340 char *p, *e;
341
342 if (offset >= 0) {
343 p = haystack + offset;
344 e = haystack + haystack_len - needle_len;
345 } else {
346 p = haystack;
347 if (needle_len > (size_t)-offset) {
348 e = haystack + haystack_len - needle_len;
349 } else {
350 e = haystack + haystack_len + offset;
351 }
352 }
353
354 if (needle_len == 1) {
355 /* Single character search can shortcut memcmps */
356 while (e >= p) {
357 if (*e == *needle) {
358 return (e - p + (offset > 0 ? offset : 0));
359 }
360 e--;
361 }
362 return -1;
363 }
364
365 while (e >= p) {
366 if (memcmp(e, needle, needle_len) == 0) {
367 return (e - p + (offset > 0 ? offset : 0));
368 }
369 e--;
370 }
371
372 return -1;
373 }
374
375 /* }}} */
376
377 /* {{{ grapheme_get_break_iterator: get a clone of the global character break iterator */
grapheme_get_break_iterator(void * stack_buffer,UErrorCode * status)378 UBreakIterator* grapheme_get_break_iterator(void *stack_buffer, UErrorCode *status )
379 {
380 int32_t buffer_size;
381
382 UBreakIterator *global_break_iterator = INTL_G( grapheme_iterator );
383
384 if ( NULL == global_break_iterator ) {
385
386 global_break_iterator = ubrk_open(UBRK_CHARACTER,
387 NULL, /* icu default locale - locale has no effect on this iterator */
388 NULL, /* text not set in global iterator */
389 0, /* text length = 0 */
390 status);
391
392 INTL_G(grapheme_iterator) = global_break_iterator;
393 }
394
395 buffer_size = U_BRK_SAFECLONE_BUFFERSIZE;
396
397 return ubrk_safeClone(global_break_iterator, stack_buffer, &buffer_size, status);
398 }
399 /* }}} */
400
401 /*
402 * Local variables:
403 * tab-width: 4
404 * c-basic-offset: 4
405 * End:
406 * vim600: fdm=marker
407 * vim: noet sw=4 ts=4
408 */
409
