Annotation of parser3/src/main/pa_common.C, revision 1.117
1.15 paf 1: /** @file
1.16 paf 2: Parser: commonly functions.
3:
1.102 paf 4: Copyright(c) 2001, 2002 ArtLebedev Group (http://www.artlebedev.com)
1.101 paf 5: Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru)
1.111 paf 6: */
1.16 paf 7:
1.117 ! paf 8: static const char* IDENT_COMMON_C="$Date: 2002/08/05 13:58:45 $";
1.1 paf 9:
10: #include "pa_common.h"
1.4 paf 11: #include "pa_exception.h"
1.14 paf 12: #include "pa_globals.h"
1.1 paf 13:
1.98 paf 14: #ifdef WIN32
15: # include <windows.h>
16: #endif
17:
1.93 paf 18: // some maybe-undefined constants
19:
1.82 paf 20: #ifndef _O_TEXT
21: # define _O_TEXT 0
22: #endif
23: #ifndef _O_BINARY
24: # define _O_BINARY 0
1.47 paf 25: #endif
1.80 paf 26: #ifndef O_TRUNC
27: # define O_TRUNC 0
28: #endif
29:
1.93 paf 30: // locking constants
31:
1.99 paf 32: #ifdef HAVE_FLOCK
33:
34: static int lock_shared_blocking(int fd) { return flock(fd, LOCK_SH); }
35: static int lock_exclusive_blocking(int fd) { return flock(fd, LOCK_EX); }
36: static int lock_exclusive_nonblocking(int fd) { return flock(fd, LOCK_EX || LOCK_NB); }
37: static int unlock(int fd) { return flock(fd, LOCK_UN); }
38:
1.98 paf 39: #else
1.99 paf 40: #ifdef HAVE__LOCKING
1.98 paf 41:
1.99 paf 42: #define FLOCK(operation) lseek(fd, 0, SEEK_SET); return _locking(fd, operation, 1)
43: static int lock_shared_blocking(int fd) { FLOCK(_LK_LOCK); }
44: static int lock_exclusive_blocking(int fd) { FLOCK(_LK_LOCK); }
45: static int lock_exclusive_nonblocking(int fd) { FLOCK(_LK_NBLCK); }
46: static int unlock(int fd) { FLOCK(_LK_UNLCK); }
1.93 paf 47:
1.99 paf 48: #else
49: #ifdef HAVE_FCNTL
1.93 paf 50:
1.99 paf 51: #define FLOCK(cmd, arg) struct flock ls={arg, SEEK_SET}; return fcntl(fd, cmd, &ls)
52: static int lock_shared_blocking(int fd) { FLOCK(F_SETLKW, F_RDLCK); }
53: static int lock_exclusive_blocking(int fd) { FLOCK(F_SETLKW, F_WRLCK); }
54: static int lock_exclusive_nonblocking(int fd) { FLOCK(F_SETLK, F_RDLCK); }
55: static int unlock(int fd) { FLOCK(F_SETLK, F_UNLCK); }
1.93 paf 56:
57: #else
58: #ifdef HAVE_LOCKF
1.99 paf 59:
60: #define FLOCK(fd, operation) lseek(fd, 0, SEEK_SET); return lockf(fd, operation, 1)
61: static int lock_shared_blocking(int fd) { FLOCK(F_LOCK); } // on intel solaris man doesn't have doc on shared blocking
62: static int lock_exclusive_blocking(int fd) { FLOCK(F_LOCK); }
63: static int lock_exclusive_nonblocking(int fd) { FLOCK(F_TLOCK); }
64: static int unlock(int fd) { FLOCK(F_TLOCK); }
65:
1.93 paf 66: #else
1.99 paf 67:
68: #error unable to find file locking func
69:
70: #endif
1.93 paf 71: #endif
72: #endif
73: #endif
74:
1.86 paf 75: static char *strnchr(char *buf, size_t size, char c) {
1.103 paf 76: // sanity check
77: if(!buf)
78: return 0;
79:
1.86 paf 80: for(; size-->0; buf++) {
81: if(*buf==c)
82: return buf;
83: }
84:
85: return 0;
86: }
87:
88: void fix_line_breaks(char *buf, size_t& size) {
1.87 paf 89: //_asm int 3;
1.86 paf 90: const char * const eob=buf+size;
1.87 paf 91: char *dest=buf;
1.72 parser 92: // fix DOS: \r\n -> \n
93: // fix Macintosh: \r -> \n
1.87 paf 94: char *bol=buf;
1.86 paf 95: while(char *eol=strnchr(bol, eob -bol, '\r')) {
1.72 parser 96: size_t len=eol-bol;
97: if(dest!=bol)
98: memcpy(dest, bol, len);
99: dest+=len;
100: *dest++='\n';
101:
1.87 paf 102: if(&eol[1]<eob && eol[1]=='\n') { // \r,\n = DOS
1.72 parser 103: bol=eol+2;
104: size--;
105: } else // \r,not \n = Macintosh
106: bol=eol+1;
107: }
108: // last piece without \r, including terminating 0
109: if(dest!=bol)
1.87 paf 110: memcpy(dest, bol, eob-bol);
1.72 parser 111: }
1.18 paf 112:
1.28 paf 113: char *file_read_text(Pool& pool, const String& file_spec, bool fail_on_read_problem) {
1.72 parser 114: void *result; size_t size;
115: return file_read(pool, file_spec, result, size, true, fail_on_read_problem)?(char *)result:0;
1.34 paf 116: }
117: bool file_read(Pool& pool, const String& file_spec,
1.87 paf 118: void*& data, size_t& data_size, bool as_text,
1.44 paf 119: bool fail_on_read_problem,
120: size_t offset, size_t limit) {
1.64 parser 121: const char *fname=file_spec.cstr(String::UL_FILE_SPEC);
1.62 parser 122: //printf("file_read(%s)\n", fname);
1.33 paf 123: int f;
1.2 paf 124: struct stat finfo;
1.33 paf 125:
126: // first open, next stat:
1.45 paf 127: // directory update of NTFS hard links performed on open.
1.33 paf 128: // ex:
129: // a.html:^test[] and b.html hardlink to a.html
130: // user inserts ! before ^test in a.html
131: // directory entry of b.html in NTFS not updated at once,
1.35 paf 132: // they delay update till open, so we would receive "!^test[" string
133: // if would do stat, next open.
1.98 paf 134: if((f=open(fname, O_RDONLY|(as_text?_O_TEXT:_O_BINARY)))>=0) {
1.110 paf 135: if(lock_shared_blocking(f)!=0) {
136: Exception e("file.lock",
137: &file_spec,
138: "shared lock failed: %s (%d), actual filename '%s'",
139: strerror(errno), errno, fname);
140: unlock(f);
141: close(f);
142: if(fail_on_read_problem)
143: throw e;
144: return false;
145: }
1.98 paf 146: if(stat(fname, &finfo)!=0) {
1.106 paf 147: Exception e("file.missing",
1.98 paf 148: &file_spec,
149: "stat failed: %s (%d), actual filename '%s'",
150: strerror(errno), errno, fname);
1.99 paf 151: unlock(f);
1.98 paf 152: close(f);
153: if(fail_on_read_problem)
154: throw e;
155: return false;
156: }
1.105 paf 157: #ifdef NO_FOREIGN_GROUP_FILES
158: if(finfo.st_gid/*foreign?*/!=getegid()) {
1.107 paf 159: Exception e("parser.runtime",
1.105 paf 160: &file_spec,
161: "parser reading files of foreign group disabled [recompile parser without --disable-foreign-group-files configure option], actual filename '%s'",
162: fname);
163: unlock(f);
164: close(f);
165: if(fail_on_read_problem)
166: throw e;
167: return false;
168: }
169: #endif
1.98 paf 170: size_t max_size=limit?min(offset+limit, (size_t)finfo.st_size)-offset:finfo.st_size;
1.47 paf 171: if(!max_size) { // eof
1.83 paf 172: if(as_text) {
173: data=pool.malloc(1);
174: *(char*)data=0;
175: } else
176: data=0;
1.98 paf 177: data_size=0;
1.59 parser 178: } else {
1.78 paf 179: data=pool.malloc(max_size+(as_text?1:0), 3);
1.59 parser 180: if(offset)
181: lseek(f, offset, SEEK_SET);
1.98 paf 182: data_size=read(f, data, max_size);
1.47 paf 183: }
1.99 paf 184: unlock(f);
1.2 paf 185: close(f);
1.59 parser 186: if(!max_size) // eof
187: return true;
1.32 paf 188:
1.98 paf 189: if(int(data_size)<0 || data_size>max_size)
1.106 paf 190: throw Exception(0,
1.33 paf 191: &file_spec,
1.44 paf 192: "read failed: actually read %d bytes count not in [0..%lu] valid range",
1.98 paf 193: data_size, (unsigned long)max_size); //never
1.87 paf 194:
195: if(as_text) {
196: fix_line_breaks((char *)data, data_size);
197: // note: after fixing
198: ((char*&)data)[data_size]=0;
199: }
1.72 parser 200: return true;
1.2 paf 201: }
1.4 paf 202: if(fail_on_read_problem)
1.106 paf 203: throw Exception(errno==EACCES?"file.access":errno==ENOENT?"file.missing":0,
1.33 paf 204: &file_spec,
1.54 parser 205: "read failed: %s (%d), actual filename '%s'",
206: strerror(errno), errno, fname);
1.34 paf 207: return false;
1.8 paf 208: }
209:
1.63 parser 210: static void create_dir_for_file(const String& file_spec) {
211: size_t pos_after=1;
212: int pos_before;
213: while((pos_before=file_spec.pos("/", 1, pos_after))>=0) {
1.64 parser 214: mkdir(file_spec.mid(0, pos_before).cstr(String::UL_FILE_SPEC), 0775);
1.63 parser 215: pos_after=pos_before+1;
216: }
217: }
218:
1.98 paf 219: bool file_write_action_under_lock(
1.28 paf 220: const String& file_spec,
1.96 paf 221: const char *action_name, void (*action)(int, void *), void *context,
1.80 paf 222: bool as_text,
1.98 paf 223: bool do_append,
1.110 paf 224: bool do_block,
225: bool fail_on_lock_problem) {
1.64 parser 226: const char *fname=file_spec.cstr(String::UL_FILE_SPEC);
1.28 paf 227: int f;
1.80 paf 228: if(access(fname, W_OK)!=0) // no
1.63 parser 229: create_dir_for_file(file_spec);
1.50 paf 230:
1.80 paf 231: if((f=open(fname,
232: O_CREAT|O_RDWR
233: |(as_text?_O_TEXT:_O_BINARY)
1.104 paf 234: |(do_append?O_APPEND:O_TRUNC), 0664))>=0) {
1.99 paf 235: if((do_block?lock_exclusive_blocking(f):lock_exclusive_nonblocking(f))!=0) {
1.110 paf 236: Exception e("file.lock",
237: &file_spec,
238: "shared lock failed: %s (%d), actual filename '%s'",
239: strerror(errno), errno, fname);
1.98 paf 240: close(f);
1.110 paf 241: if(fail_on_lock_problem)
242: throw e;
1.98 paf 243: return false;
244: }
1.96 paf 245:
246: try {
247: action(f, context);
248: } catch(...) {
1.98 paf 249: #if O_TRUNC==0
1.104 paf 250: if(!do_append)
251: ftruncate(f, tell(f));
1.98 paf 252: #endif
1.99 paf 253: unlock(f);
1.96 paf 254: close(f);
255: /*re*/throw;
256: }
1.80 paf 257:
1.98 paf 258: #if O_TRUNC==0
1.104 paf 259: if(!do_append)
260: ftruncate(f, tell(f));
1.98 paf 261: #endif
1.99 paf 262: unlock(f);
1.80 paf 263: close(f);
1.98 paf 264: return true;
1.80 paf 265: } else
1.106 paf 266: throw Exception(errno==EACCES?"file.access":0,
1.80 paf 267: &file_spec,
1.96 paf 268: "%s failed: %s (%d), actual filename '%s'",
269: action_name, strerror(errno), errno, fname);
270: // here should be nothing, see rethrow above
271: }
272:
273: #ifndef DOXYGEN
274: struct File_write_action_info {
275: const void *data; size_t size;
276: };
277: #endif
278: static void file_write_action(int f, void *context) {
279: File_write_action_info& info=*static_cast<File_write_action_info *>(context);
1.113 paf 280: if(info.size) {
1.116 paf 281: int written=write(f, info.data, info.size);
282: if(written<0)
1.113 paf 283: throw Exception(0,
284: 0,
1.115 paf 285: "write failed: %s (%d)", strerror(errno), errno);
1.113 paf 286: }
1.96 paf 287: }
288: void file_write(
289: const String& file_spec,
290: const void *data, size_t size,
291: bool as_text,
292: bool do_append) {
293: File_write_action_info info={data, size};
1.98 paf 294: file_write_action_under_lock(
1.96 paf 295: file_spec,
296: "write", file_write_action, &info,
297: as_text,
298: do_append);
1.30 paf 299: }
300:
1.63 parser 301: // throws nothing! [this is required in file_move & file_delete]
1.50 paf 302: static void rmdir(const String& file_spec, size_t pos_after) {
303: int pos_before;
304: if((pos_before=file_spec.pos("/", 1, pos_after))>=0)
305: rmdir(file_spec, pos_before+1);
306:
1.64 parser 307: rmdir(file_spec.mid(0, pos_after-1/* / */).cstr(String::UL_FILE_SPEC));
1.50 paf 308: }
1.95 paf 309: bool file_delete(const String& file_spec, bool fail_on_read_problem) {
1.64 parser 310: const char *fname=file_spec.cstr(String::UL_FILE_SPEC);
1.54 parser 311: if(unlink(fname)!=0)
1.93 paf 312: if(fail_on_read_problem)
1.106 paf 313: throw Exception(errno==EACCES?"file.access":errno==ENOENT?"file.missing":0,
1.93 paf 314: &file_spec,
315: "unlink failed: %s (%d), actual filename '%s'",
316: strerror(errno), errno, fname);
317: else
318: return false;
1.50 paf 319:
320: rmdir(file_spec, 1);
1.93 paf 321: return true;
1.60 parser 322: }
1.95 paf 323: void file_move(const String& old_spec, const String& new_spec) {
1.64 parser 324: const char *old_spec_cstr=old_spec.cstr(String::UL_FILE_SPEC);
325: const char *new_spec_cstr=new_spec.cstr(String::UL_FILE_SPEC);
1.63 parser 326:
327: create_dir_for_file(new_spec);
328:
1.60 parser 329: if(rename(old_spec_cstr, new_spec_cstr)!=0)
1.106 paf 330: throw Exception(errno==EACCES?"file.access":errno==ENOENT?"file.missing":0,
1.60 parser 331: &old_spec,
332: "rename failed: %s (%d), actual filename '%s' to '%s'",
333: strerror(errno), errno, old_spec_cstr, new_spec_cstr);
1.63 parser 334:
335: rmdir(old_spec, 1);
1.31 paf 336: }
337:
1.51 paf 338:
339: static bool entry_readable(const String& file_spec, bool need_dir) {
1.64 parser 340: const char *fname=file_spec.cstr(String::UL_FILE_SPEC);
1.51 paf 341: struct stat finfo;
342: if(access(fname, R_OK)==0 && stat(fname, &finfo)==0) {
1.109 paf 343: bool is_dir=(finfo.st_mode&S_IFDIR) != 0;
1.51 paf 344: return is_dir==need_dir;
345: }
346: return false;
347: }
1.31 paf 348: bool file_readable(const String& file_spec) {
1.51 paf 349: return entry_readable(file_spec, false);
350: }
351: bool dir_readable(const String& file_spec) {
352: return entry_readable(file_spec, true);
1.65 parser 353: }
354: String *file_readable(const String& path, const String& name) {
355: String *result=new(path.pool()) String(path);
356: *result << "/";
357: *result << name;
358: return file_readable(*result)?result:0;
1.43 paf 359: }
360: bool file_executable(const String& file_spec) {
1.64 parser 361: return access(file_spec.cstr(String::UL_FILE_SPEC), X_OK)==0;
1.44 paf 362: }
363:
1.64 parser 364: bool file_stat(const String& file_spec,
1.58 parser 365: size_t& rsize,
366: time_t& ratime,
367: time_t& rmtime,
1.64 parser 368: time_t& rctime,
369: bool fail_on_read_problem) {
1.44 paf 370: Pool& pool=file_spec.pool();
1.64 parser 371: const char *fname=file_spec.cstr(String::UL_FILE_SPEC);
1.44 paf 372: struct stat finfo;
373: if(stat(fname, &finfo)!=0)
1.64 parser 374: if(fail_on_read_problem)
1.106 paf 375: throw Exception("file.missing",
1.67 parser 376: &file_spec,
377: "getting file size failed: %s (%d), real filename '%s'",
378: strerror(errno), errno, fname);
1.64 parser 379: else
380: return false;
1.58 parser 381: rsize=finfo.st_size;
382: ratime=finfo.st_atime;
383: rmtime=finfo.st_mtime;
384: rctime=finfo.st_ctime;
1.64 parser 385: return true;
1.18 paf 386: }
387:
1.8 paf 388: char *getrow(char **row_ref, char delim) {
389: char *result=*row_ref;
390: if(result) {
391: *row_ref=strchr(result, delim);
392: if(*row_ref)
393: *((*row_ref)++)=0;
394: else if(!*result)
395: return 0;
396: }
397: return result;
398: }
399:
1.23 paf 400: char *lsplit(char *string, char delim) {
401: if(string) {
402: char *v=strchr(string, delim);
1.8 paf 403: if(v) {
404: *v=0;
405: return v+1;
406: }
407: }
408: return 0;
409: }
410:
411: char *lsplit(char **string_ref, char delim) {
412: char *result=*string_ref;
413: char *next=lsplit(*string_ref, delim);
414: *string_ref=next;
415: return result;
1.9 paf 416: }
417:
418: char *rsplit(char *string, char delim) {
1.18 paf 419: if(string) {
1.9 paf 420: char *v=strrchr(string, delim);
1.18 paf 421: if(v) {
1.9 paf 422: *v=0;
423: return v+1;
424: }
425: }
426: return NULL;
1.10 paf 427: }
428:
1.37 paf 429: /// @todo less stupid type detection
1.10 paf 430: char *format(Pool& pool, double value, char *fmt) {
1.108 paf 431: char local_buf[MAX_NUMBER];
432: size_t size;
433:
1.10 paf 434: if(fmt)
435: if(strpbrk(fmt, "diouxX"))
436: if(strpbrk(fmt, "ouxX"))
1.108 paf 437: size=snprintf(local_buf, sizeof(local_buf), fmt, (uint)value);
1.10 paf 438: else
1.108 paf 439: size=snprintf(local_buf, sizeof(local_buf), fmt, (int)value);
1.10 paf 440: else
1.108 paf 441: size=snprintf(local_buf, sizeof(local_buf), fmt, value);
1.10 paf 442: else
1.108 paf 443: size=snprintf(local_buf, sizeof(local_buf), "%d", (int)value);
1.10 paf 444:
1.108 paf 445: char *pool_buf=(char *)pool.malloc(size+1, 4);
446: memcpy(pool_buf, local_buf, size+1);
447: return pool_buf;
1.12 paf 448: }
449:
1.36 paf 450: size_t stdout_write(const void *buf, size_t size) {
1.12 paf 451: #ifdef WIN32
452: do{
453: int chunk_written=fwrite(buf, 1, min(8*0x400, size), stdout);
454: if(chunk_written<=0)
455: break;
456: size-=chunk_written;
1.36 paf 457: buf=((const char*)buf)+chunk_written;
1.12 paf 458: } while(size>0);
459:
460: return size;
461: #else
1.13 paf 462: return fwrite(buf, 1, size, stdout);
1.12 paf 463: #endif
1.2 paf 464: }
1.14 paf 465:
1.77 parser 466: char *unescape_chars(Pool& pool, const char *cp, int len) {
1.78 paf 467: char *s=(char *)pool.malloc(len + 1, 5);
1.14 paf 468: enum EscapeState {
1.33 paf 469: EscapeRest,
470: EscapeFirst,
1.14 paf 471: EscapeSecond
472: } escapeState=EscapeRest;
473: int escapedValue=0;
474: int srcPos=0;
475: int dstPos=0;
476: while(srcPos < len) {
477: int ch=cp[srcPos];
478: switch(escapeState) {
479: case EscapeRest:
480: if(ch=='%') {
481: escapeState=EscapeFirst;
482: } else if(ch=='+') {
483: s[dstPos++]=' ';
484: } else {
485: s[dstPos++]=ch;
486: }
487: break;
488: case EscapeFirst:
489: escapedValue=hex_value[ch] << 4;
490: escapeState=EscapeSecond;
491: break;
492: case EscapeSecond:
493: escapedValue +=hex_value[ch];
494: s[dstPos++]=escapedValue;
495: escapeState=EscapeRest;
496: break;
497: }
498: srcPos++;
499: }
500: s[dstPos]=0;
501: return s;
1.24 paf 502: }
503:
504: #ifdef WIN32
505: void back_slashes_to_slashes(char *s) {
506: if(s)
507: for(; *s; s++)
508: if(*s=='\\')
509: *s='/';
510: }
1.42 paf 511: /*
512: void slashes_to_back_slashes(char *s) {
513: if(s)
514: for(; *s; s++)
515: if(*s=='/')
516: *s='\\';
517: }
518: */
1.24 paf 519: #endif
1.41 paf 520:
521: bool StrEqNc(const char *s1, const char *s2, bool strict) {
522: while(true) {
523: if(!(*s1)) {
524: if(!(*s2))
525: return true;
526: else
527: return !strict;
528: } else if(!(*s2))
529: return !strict;
530: if(isalpha(*s1)) {
531: if(tolower(*s1) !=tolower(*s2))
532: return false;
533: } else if((*s1) !=(*s2))
534: return false;
535: s1++;
536: s2++;
537: }
1.57 parser 538: }
539:
1.84 paf 540: static bool isLeap(int year) {
1.57 parser 541: return !(
542: (year % 4) || ((year % 400) && !(year % 100))
543: );
544: }
545:
546: int getMonthDays(int year, int month) {
547: int monthDays[]={
548: 31,
549: isLeap(year) ? 29 : 28,
550: 31,
551: 30,
552: 31,
553: 30,
554: 31,
555: 31,
556: 30,
557: 31,
558: 30,
559: 31
560: };
561: return monthDays[month];
1.41 paf 562: }
1.69 parser 563:
564: void remove_crlf(char *start, char *end) {
565: for(char *p=start; p<end; p++)
566: switch(*p) {
567: case '\n': *p='|'; break;
568: case '\r': *p=' '; break;
569: }
1.91 paf 570: }
571:
572:
573: /// must be last in this file
574: #undef vsnprintf
575: int __vsnprintf(char *b, size_t s, const char *f, va_list l) {
576: if(!s)
577: return 0;
578:
579: int r;
580: // note: on win32& maybe somewhere else
581: // vsnprintf do not writes terminating 0 in 'buffer full' case, reducing
582: --s;
583: #if _MSC_VER
584: /*
585: win32:
586: mk:@MSITStore:C:\Program%20Files\Microsoft%20Visual%20Studio\MSDN\2001APR\1033\vccore.chm::/html/_crt__vsnprintf.2c_._vsnwprintf.htm
587:
588: if the number of bytes to write exceeds buffer, then count bytes are written and –1 is returned
589: */
590: r=_vsnprintf(b, s, f, l);
591: if(r<0)
592: r=s;
593: #else
594: r=vsnprintf(b, s, f, l);
595: /*
596: solaris:
597: man vsnprintf
598:
599: The snprintf() function returns the number of characters
600: formatted, that is, the number of characters that would have
601: been written to the buffer if it were large enough. If the
602: value of n is 0 on a call to snprintf(), an unspecified
603: value less than 1 is returned.
604: */
605:
606: if(r<0)
607: r=0;
608: else if(r>s)
609: r=s;
610: #endif
611: b[r]=0;
612: return r;
613: }
614:
615: int __snprintf(char *b, size_t s, const char *f, ...) {
616: va_list l;
617: va_start(l, f);
618: int r=__vsnprintf(b, s, f, l);
619: va_end(l);
620: return r;
1.98 paf 621: }
622:
623: int pa_sleep(unsigned long secs, unsigned long usecs) {
624: for (; usecs >= 1000000; ++secs, usecs -= 1000000);
625:
626: #ifdef WIN32
627: Sleep(secs * 1000 + usecs / 1000);
628: return 0;
629: #else
630: struct timeval t;
631: t.tv_sec = secs;
632: t.tv_usec = usecs;
633: return (select(0, NULL, NULL, NULL, &t) == -1 ? errno : 0);
634: #endif
1.74 parser 635: }
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