summaryrefslogtreecommitdiff
path: root/indra/newview/lllogchat.cpp
blob: 09f816a4e6ea127bc1d78a10ab31ecb2825d7661 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
/** 
 * @file lllogchat.cpp
 * @brief LLLogChat class implementation
 *
 * $LicenseInfo:firstyear=2002&license=viewerlgpl$
 * Second Life Viewer Source Code
 * Copyright (C) 2010, Linden Research, Inc.
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation;
 * version 2.1 of the License only.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 * 
 * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
 * $/LicenseInfo$
 */

#include "llviewerprecompiledheaders.h"

#include "llagent.h"
#include "llagentui.h"
#include "llavatarnamecache.h"
#include "lllogchat.h"
#include "lltrans.h"
#include "llviewercontrol.h"

#include "lldiriterator.h"
#include "llfloaterimsessiontab.h"
#include "llinstantmessage.h"
#include "llsingleton.h" // for LLSingleton

#include <boost/algorithm/string/trim.hpp>
#include <boost/algorithm/string/replace.hpp>
#include <boost/regex.hpp>
#include <boost/regex/v4/match_results.hpp>
#include <boost/foreach.hpp>

#if LL_MSVC
#pragma warning(push)  
// disable warning about boost::lexical_cast unreachable code
// when it fails to parse the string
#pragma warning (disable:4702)
#endif

#include <boost/date_time/gregorian/gregorian.hpp>
#if LL_MSVC
#pragma warning(pop)   // Restore all warnings to the previous state
#endif

#include <boost/date_time/posix_time/posix_time.hpp>
#include <boost/date_time/local_time_adjustor.hpp>

const S32 LOG_RECALL_SIZE = 2048;

const std::string LL_IM_TIME("time");
const std::string LL_IM_TEXT("message");
const std::string LL_IM_FROM("from");
const std::string LL_IM_FROM_ID("from_id");
const std::string LL_TRANSCRIPT_FILE_EXTENSION("txt");

const static std::string IM_SEPARATOR(": ");
const static std::string NEW_LINE("\n");
const static std::string NEW_LINE_SPACE_PREFIX("\n ");
const static std::string TWO_SPACES("  ");
const static std::string MULTI_LINE_PREFIX(" ");

/**
 *  Chat log lines - timestamp and name are optional but message text is mandatory.
 *
 *  Typical plain text chat log lines:
 *
 *  SuperCar: You aren't the owner
 *  [2:59]  SuperCar: You aren't the owner
 *  [2009/11/20 3:00]  SuperCar: You aren't the owner
 *  Katar Ivercourt is Offline
 *  [3:00]  Katar Ivercourt is Offline
 *  [2009/11/20 3:01]  Corba ProductEngine is Offline
 *
 * Note: "You" was used as an avatar names in viewers of previous versions
 */
const static boost::regex TIMESTAMP_AND_STUFF("^(\\[\\d{4}/\\d{1,2}/\\d{1,2}\\s+\\d{1,2}:\\d{2}\\]\\s+|\\[\\d{1,2}:\\d{2}\\]\\s+)?(.*)$");
const static boost::regex TIMESTAMP("^(\\[\\d{4}/\\d{1,2}/\\d{1,2}\\s+\\d{1,2}:\\d{2}\\]|\\[\\d{1,2}:\\d{2}\\]).*");

/**
 *  Regular expression suitable to match names like
 *  "You", "Second Life", "Igor ProductEngine", "Object", "Mega House"
 */
const static boost::regex NAME_AND_TEXT("([^:]+[:]{1})?(\\s*)(.*)");

/**
 * These are recognizers for matching the names of ad-hoc conferences when generating the log file name
 * On invited side, an ad-hoc is named like "<first name> <last name> Conference 2010/11/19 03:43 f0f4"
 * On initiating side, an ad-hoc is named like Ad-hoc Conference hash<hash>"
 * If the naming system for ad-hoc conferences are change in LLIMModel::LLIMSession::buildHistoryFileName()
 * then these definition need to be adjusted as well.
 */
const static boost::regex INBOUND_CONFERENCE("^[a-zA-Z]{1,31} [a-zA-Z]{1,31} Conference [0-9]{4}/[0-9]{2}/[0-9]{2} [0-9]{2}:[0-9]{2} [0-9a-f]{4}");
const static boost::regex OUTBOUND_CONFERENCE("^Ad-hoc Conference hash[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12}");

//is used to parse complex object names like "Xstreet SL Terminal v2.2.5 st"
const static std::string NAME_TEXT_DIVIDER(": ");

// is used for timestamps adjusting
const static char* DATE_FORMAT("%Y/%m/%d %H:%M");
const static char* TIME_FORMAT("%H:%M");

const static int IDX_TIMESTAMP = 1;
const static int IDX_STUFF = 2;
const static int IDX_NAME = 1;
const static int IDX_TEXT = 3;

using namespace boost::posix_time;
using namespace boost::gregorian;

void append_to_last_message(std::list<LLSD>& messages, const std::string& line)
{
	if (!messages.size()) return;

	std::string im_text = messages.back()[LL_IM_TEXT].asString();
	im_text.append(line);
	messages.back()[LL_IM_TEXT] = im_text;
}

class LLLogChatTimeScanner: public LLSingleton<LLLogChatTimeScanner>
{
public:
	LLLogChatTimeScanner()
	{
		// Note, date/time facets will be destroyed by string streams
		mDateStream.imbue(std::locale(mDateStream.getloc(), new date_input_facet(DATE_FORMAT)));
		mTimeStream.imbue(std::locale(mTimeStream.getloc(), new time_facet(TIME_FORMAT)));
		mTimeStream.imbue(std::locale(mTimeStream.getloc(), new time_input_facet(DATE_FORMAT)));
	}

	date getTodayPacificDate()
	{
		typedef	boost::date_time::local_adjustor<ptime, -8, no_dst> pst;
		typedef boost::date_time::local_adjustor<ptime, -7, no_dst> pdt;
		time_t t_time = time(NULL);
		ptime p_time = LLStringOps::getPacificDaylightTime()
			? pdt::utc_to_local(from_time_t(t_time))
			: pst::utc_to_local(from_time_t(t_time));
		struct tm s_tm = to_tm(p_time);
		return date_from_tm(s_tm);
	}

	void checkAndCutOffDate(std::string& time_str)
	{
		// Cuts off the "%Y/%m/%d" from string for todays timestamps.
		// Assume that passed string has at least "%H:%M" time format.
		date log_date(not_a_date_time);
		date today(getTodayPacificDate());

		// Parse the passed date
		mDateStream.str(LLStringUtil::null);
		mDateStream << time_str;
		mDateStream >> log_date;
		mDateStream.clear();

		days zero_days(0);
		days days_alive = today - log_date;

		if ( days_alive == zero_days )
		{
			// Yep, today's so strip "%Y/%m/%d" info
			ptime stripped_time(not_a_date_time);

			mTimeStream.str(LLStringUtil::null);
			mTimeStream << time_str;
			mTimeStream >> stripped_time;
			mTimeStream.clear();

			time_str.clear();

			mTimeStream.str(LLStringUtil::null);
			mTimeStream << stripped_time;
			mTimeStream >> time_str;
			mTimeStream.clear();
		}

		LL_DEBUGS("LLChatLogParser")
			<< " log_date: "
			<< log_date
			<< " today: "
			<< today
			<< " days alive: "
			<< days_alive
			<< " new time: "
			<< time_str
			<< LL_ENDL;
	}


private:
	std::stringstream mDateStream;
	std::stringstream mTimeStream;
};

LLLogChat::save_history_signal_t * LLLogChat::sSaveHistorySignal = NULL;

//static
std::string LLLogChat::makeLogFileName(std::string filename)
{
	/**
	 * Testing for in bound and out bound ad-hoc file names
	 * if it is then skip date stamping.
	 **/

	boost::match_results<std::string::const_iterator> matches;
	bool inboundConf = boost::regex_match(filename, matches, INBOUND_CONFERENCE);
	bool outboundConf = boost::regex_match(filename, matches, OUTBOUND_CONFERENCE);
	if (!(inboundConf || outboundConf))
	{
		if( gSavedPerAccountSettings.getBOOL("LogFileNamewithDate") )
		{
			time_t now;
			time(&now);
			char dbuffer[20];		/* Flawfinder: ignore */
			if (filename == "chat")
			{
				strftime(dbuffer, 20, "-%Y-%m-%d", localtime(&now));
			}
			else
			{
				strftime(dbuffer, 20, "-%Y-%m", localtime(&now));
			}
			filename += dbuffer;
		}
	}

	filename = cleanFileName(filename);
	filename = gDirUtilp->getExpandedFilename(LL_PATH_PER_ACCOUNT_CHAT_LOGS, filename);
	filename += '.' + LL_TRANSCRIPT_FILE_EXTENSION;

	return filename;
}

std::string LLLogChat::cleanFileName(std::string filename)
{
	std::string invalidChars = "\"\'\\/?*:.<>|[]{}~"; // Cannot match glob or illegal filename chars
	std::string::size_type position = filename.find_first_of(invalidChars);
	while (position != filename.npos)
	{
		filename[position] = '_';
		position = filename.find_first_of(invalidChars, position);
	}
	return filename;
}

std::string LLLogChat::timestamp(bool withdate)
{
	std::string timeStr;
	if (withdate)
	{
		timeStr = "[" + LLTrans::getString ("TimeYear") + "]/["
				  + LLTrans::getString ("TimeMonth") + "]/["
				  + LLTrans::getString ("TimeDay") + "] ["
				  + LLTrans::getString ("TimeHour") + "]:["
				  + LLTrans::getString ("TimeMin") + "]";
	}
	else
	{
		timeStr = "[" + LLTrans::getString("TimeHour") + "]:["
				  + LLTrans::getString ("TimeMin")+"]";
	}

	LLSD substitution;
	substitution["datetime"] = (S32)time_corrected();

	LLStringUtil::format (timeStr, substitution);
	return timeStr;
}


//static
void LLLogChat::saveHistory(const std::string& filename,
							const std::string& from,
							const LLUUID& from_id,
							const std::string& line)
{
	std::string tmp_filename = filename;
	LLStringUtil::trim(tmp_filename);
	if (tmp_filename.empty())
	{
		std::string warn = "Chat history filename [" + filename + "] is empty!";
		llwarning(warn, 666);
		llassert(tmp_filename.size());
		return;
	}
	
	llofstream file (LLLogChat::makeLogFileName(filename), std::ios_base::app);
	if (!file.is_open())
	{
		llwarns << "Couldn't open chat history log! - " + filename << llendl;
		return;
	}

	LLSD item;

	if (gSavedPerAccountSettings.getBOOL("LogTimestamp"))
		 item["time"] = LLLogChat::timestamp(gSavedPerAccountSettings.getBOOL("LogTimestampDate"));

	item["from_id"]	= from_id;
	item["message"]	= line;

	//adding "Second Life:" for all system messages to make chat log history parsing more reliable
	if (from.empty() && from_id.isNull())
	{
		item["from"] = SYSTEM_FROM; 
	}
	else
	{
		item["from"] = from;
	}

	file << LLChatLogFormatter(item) << std::endl;

	file.close();

	if (NULL != sSaveHistorySignal)
	{
		(*sSaveHistorySignal)();
	}
}

// static
void LLLogChat::loadChatHistory(const std::string& file_name, std::list<LLSD>& messages, const LLSD& load_params)
{
	if (file_name.empty())
	{
		llwarns << "Session name is Empty!" << llendl;
		return ;
	}

	bool load_all_history = load_params.has("load_all_history") ? load_params["load_all_history"].asBoolean() : false;

	LLFILE* fptr = LLFile::fopen(makeLogFileName(file_name), "r");/*Flawfinder: ignore*/
	if (!fptr)
	{
		fptr = LLFile::fopen(oldLogFileName(file_name), "r");/*Flawfinder: ignore*/
		if (!fptr)
		{
			return;						//No previous conversation with this name.
		}
	}
 
	char buffer[LOG_RECALL_SIZE];		/*Flawfinder: ignore*/
	char *bptr;
	S32 len;
	bool firstline = TRUE;

	if (load_all_history || fseek(fptr, (LOG_RECALL_SIZE - 1) * -1  , SEEK_END))
	{	//We need to load the whole historyFile or it's smaller than recall size, so get it all.
		firstline = FALSE;
		if (fseek(fptr, 0, SEEK_SET))
		{
			fclose(fptr);
			return;
		}
	}

	while (fgets(buffer, LOG_RECALL_SIZE, fptr)  && !feof(fptr)) 
	{
		len = strlen(buffer) - 1;		/*Flawfinder: ignore*/
		for (bptr = (buffer + len); (*bptr == '\n' || *bptr == '\r') && bptr>buffer; bptr--)	*bptr='\0';
		
		if (firstline)
		{
			firstline = FALSE;
			continue;
		}

		std::string line(buffer);

		//updated 1.23 plaint text log format requires a space added before subsequent lines in a multilined message
		if (' ' == line[0])
		{
			line.erase(0, MULTI_LINE_PREFIX.length());
			append_to_last_message(messages, '\n' + line);
		}
		else if (0 == len && ('\n' == line[0] || '\r' == line[0]))
		{
			//to support old format's multilined messages with new lines used to divide paragraphs
			append_to_last_message(messages, line);
		}
		else
		{
			LLSD item;
			if (!LLChatLogParser::parse(line, item, load_params))
			{
				item[LL_IM_TEXT] = line;
			}
			messages.push_back(item);
		}
	}
	fclose(fptr);
}

// static
std::string LLLogChat::oldLogFileName(std::string filename)
{
	// get Users log directory
	std::string directory = gDirUtilp->getPerAccountChatLogsDir();

	// add final OS dependent delimiter
	directory += gDirUtilp->getDirDelimiter();

	// lest make sure the file name has no invalid characters before making the pattern
	filename = cleanFileName(filename);

	// create search pattern
	std::string pattern = filename + ( filename == "chat" ? "-???\?-?\?-??.txt" : "-???\?-??.txt");

	std::vector<std::string> allfiles;
	LLDirIterator iter(directory, pattern);
	std::string scanResult;

	while (iter.next(scanResult))
	{
		allfiles.push_back(scanResult);
	}

	if (allfiles.size() == 0)  // if no result from date search, return generic filename
	{
		scanResult = directory + filename + '.' + LL_TRANSCRIPT_FILE_EXTENSION;
	}
	else 
	{
		sort(allfiles.begin(), allfiles.end());
		scanResult = directory + allfiles.back();
		// this file is now the most recent version of the file.
	}

	return scanResult;
}

// static
void LLLogChat::getListOfTranscriptFiles(std::vector<std::string>& list_of_transcriptions)
{
	// get Users log directory
	std::string dirname = gDirUtilp->getPerAccountChatLogsDir();

	// add final OS dependent delimiter
	dirname += gDirUtilp->getDirDelimiter();

	// create search pattern
	std::string pattern = "*." + LL_TRANSCRIPT_FILE_EXTENSION;

	LLDirIterator iter(dirname, pattern);
	std::string filename;
	while (iter.next(filename))
	{
		std::string fullname = gDirUtilp->add(dirname, filename);

		LLFILE * filep = LLFile::fopen(fullname, "rb");
		if (NULL != filep)
		{
			char buffer[LOG_RECALL_SIZE];

			fseek(filep, 0, SEEK_END);			// seek to end of file
			S32 bytes_to_read = ftell(filep);	// get current file pointer
			fseek(filep, 0, SEEK_SET);			// seek back to beginning of file

			// limit the number characters to read from file
			if (bytes_to_read >= LOG_RECALL_SIZE)
			{
				bytes_to_read = LOG_RECALL_SIZE - 1;
			}

			if (bytes_to_read > 0 && NULL != fgets(buffer, bytes_to_read, filep))
			{
				//matching a timestamp
				boost::match_results<std::string::const_iterator> matches;
				if (boost::regex_match(std::string(buffer), matches, TIMESTAMP))
				{
					list_of_transcriptions.push_back(gDirUtilp->add(dirname, filename));
				}
			}
			LLFile::close(filep);
		}
	}
}

//static
boost::signals2::connection LLLogChat::setSaveHistorySignal(const save_history_signal_t::slot_type& cb)
{
	if (NULL == sSaveHistorySignal)
	{
		sSaveHistorySignal = new save_history_signal_t();
	}

	return sSaveHistorySignal->connect(cb);
}

//static
void LLLogChat::deleteTranscripts()
{
	std::vector<std::string> list_of_transcriptions;
	getListOfTranscriptFiles(list_of_transcriptions);

	BOOST_FOREACH(const std::string& fullpath, list_of_transcriptions)
	{
		S32 retry_count = 0;
		while (retry_count < 5)
		{
			if (0 != LLFile::remove(fullpath))
			{
				retry_count++;
				S32 result = errno;
				LL_WARNS("LLLogChat::deleteTranscripts") << "Problem removing " << fullpath << " - errorcode: "
					<< result << " attempt " << retry_count << LL_ENDL;

				if(retry_count >= 5)
				{
					LL_WARNS("LLLogChat::deleteTranscripts") << "Failed to remove " << fullpath << LL_ENDL;
					return;
				}

				ms_sleep(100);
			}
			else
			{
				if (retry_count)
				{
					LL_WARNS("LLLogChat::deleteTranscripts") << "Successfully removed " << fullpath << LL_ENDL;
				}
				break;
			}			
		}
	}

	LLFloaterIMSessionTab::processChatHistoryStyleUpdate(true);
}

// static
bool LLLogChat::isTranscriptExist(const LLUUID& avatar_id)
{
	std::vector<std::string> list_of_transcriptions;
	LLLogChat::getListOfTranscriptFiles(list_of_transcriptions);

	if (list_of_transcriptions.size() > 0)
	{
		LLAvatarName avatar_name;
		LLAvatarNameCache::get(avatar_id, &avatar_name);
		std::string avatar_user_name = avatar_name.getAccountName();
		std::replace(avatar_user_name.begin(), avatar_user_name.end(), '.', '_');

		BOOST_FOREACH(std::string& transcript_file_name, list_of_transcriptions)
		{
			if (std::string::npos != transcript_file_name.find(avatar_user_name))
			{
				return true;
			}
		}
	}

	return false;
}

//*TODO mark object's names in a special way so that they will be distinguishable form avatar name 
//which are more strict by its nature (only firstname and secondname)
//Example, an object's name can be written like "Object <actual_object's_name>"
void LLChatLogFormatter::format(const LLSD& im, std::ostream& ostr) const
{
	if (!im.isMap())
	{
		llwarning("invalid LLSD type of an instant message", 0);
		return;
	}

	if (im[LL_IM_TIME].isDefined())
{
		std::string timestamp = im[LL_IM_TIME].asString();
		boost::trim(timestamp);
		ostr << '[' << timestamp << ']' << TWO_SPACES;
	}
	
	//*TODO mark object's names in a special way so that they will be distinguishable form avatar name 
	//which are more strict by its nature (only firstname and secondname)
	//Example, an object's name can be written like "Object <actual_object's_name>"
	if (im[LL_IM_FROM].isDefined())
	{
		std::string from = im[LL_IM_FROM].asString();
		boost::trim(from);
		if (from.size())
		{
			ostr << from << IM_SEPARATOR;
		}
	}

	if (im[LL_IM_TEXT].isDefined())
	{
		std::string im_text = im[LL_IM_TEXT].asString();

		//multilined text will be saved with prepended spaces
		boost::replace_all(im_text, NEW_LINE, NEW_LINE_SPACE_PREFIX);
		ostr << im_text;
	}
	}

bool LLChatLogParser::parse(std::string& raw, LLSD& im, const LLSD& parse_params)
{
	if (!raw.length()) return false;
	
	bool cut_off_todays_date = parse_params.has("cut_off_todays_date")  ? parse_params["cut_off_todays_date"].asBoolean()  : true;
	im = LLSD::emptyMap();

	//matching a timestamp
	boost::match_results<std::string::const_iterator> matches;
	if (!boost::regex_match(raw, matches, TIMESTAMP_AND_STUFF)) return false;
	
	bool has_timestamp = matches[IDX_TIMESTAMP].matched;
	if (has_timestamp)
	{
		//timestamp was successfully parsed
		std::string timestamp = matches[IDX_TIMESTAMP];
		boost::trim(timestamp);
		timestamp.erase(0, 1);
		timestamp.erase(timestamp.length()-1, 1);

		if (cut_off_todays_date)
		{
			LLLogChatTimeScanner::instance().checkAndCutOffDate(timestamp);
		}

		im[LL_IM_TIME] = timestamp;
	}
	else
	{
		//timestamp is optional
		im[LL_IM_TIME] = "";
	}

	bool has_stuff = matches[IDX_STUFF].matched;
	if (!has_stuff)
	{
		return false;  //*TODO should return false or not?
	}

	//matching a name and a text
	std::string stuff = matches[IDX_STUFF];
	boost::match_results<std::string::const_iterator> name_and_text;
	if (!boost::regex_match(stuff, name_and_text, NAME_AND_TEXT)) return false;
	
	bool has_name = name_and_text[IDX_NAME].matched;
	std::string name = name_and_text[IDX_NAME];

	//we don't need a name/text separator
	if (has_name && name.length() && name[name.length()-1] == ':')
	{
		name.erase(name.length()-1, 1);
	}

	if (!has_name || name == SYSTEM_FROM)
	{
		//name is optional too
		im[LL_IM_FROM] = SYSTEM_FROM;
		im[LL_IM_FROM_ID] = LLUUID::null;
	}

	//possibly a case of complex object names consisting of 3+ words
	if (!has_name)
	{
		U32 divider_pos = stuff.find(NAME_TEXT_DIVIDER);
		if (divider_pos != std::string::npos && divider_pos < (stuff.length() - NAME_TEXT_DIVIDER.length()))
		{
			im[LL_IM_FROM] = stuff.substr(0, divider_pos);
			im[LL_IM_TEXT] = stuff.substr(divider_pos + NAME_TEXT_DIVIDER.length());
			return true;
		}
	}

	if (!has_name)
	{
		//text is mandatory
		im[LL_IM_TEXT] = stuff;
		return true; //parse as a message from Second Life
	}
	
	bool has_text = name_and_text[IDX_TEXT].matched;
	if (!has_text) return false;

	//for parsing logs created in very old versions of a viewer
	if (name == "You")
	{
		std::string agent_name;
		LLAgentUI::buildFullname(agent_name);
		im[LL_IM_FROM] = agent_name;
		im[LL_IM_FROM_ID] = gAgentID;
	}
	else
	{
		im[LL_IM_FROM] = name;
	}
	

	im[LL_IM_TEXT] = name_and_text[IDX_TEXT];
	return true;  //parsed name and message text, maybe have a timestamp too
}