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comparison: intl/icu/source/i18n/uspoof_conf.cpp

intl/icu/source/i18n/uspoof_conf.cpp

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1 /*
2 ******************************************************************************
3 *
4 * Copyright (C) 2008-2013, International Business Machines
5 * Corporation and others. All Rights Reserved.
6 *
7 ******************************************************************************
8 * file name: uspoof_conf.cpp
9 * encoding: US-ASCII
10 * tab size: 8 (not used)
11 * indentation:4
12 *
13 * created on: 2009Jan05 (refactoring earlier files)
14 * created by: Andy Heninger
15 *
16 * Internal classes for compililing confusable data into its binary (runtime) form.
17 */
18
19 #include "unicode/utypes.h"
20 #include "unicode/uspoof.h"
21 #if !UCONFIG_NO_REGULAR_EXPRESSIONS
22 #if !UCONFIG_NO_NORMALIZATION
23
24 #include "unicode/unorm.h"
25 #include "unicode/uregex.h"
26 #include "unicode/ustring.h"
27 #include "cmemory.h"
28 #include "uspoof_impl.h"
29 #include "uhash.h"
30 #include "uvector.h"
31 #include "uassert.h"
32 #include "uarrsort.h"
33 #include "uspoof_conf.h"
34
35 U_NAMESPACE_USE
36
37
38 //---------------------------------------------------------------------
39 //
40 // buildConfusableData Compile the source confusable data, as defined by
41 // the Unicode data file confusables.txt, into the binary
42 // structures used by the confusable detector.
43 //
44 // The binary structures are described in uspoof_impl.h
45 //
46 // 1. parse the data, building 4 hash tables, one each for the SL, SA, ML and MA
47 // tables. Each maps from a UChar32 to a String.
48 //
49 // 2. Sort all of the strings encountered by length, since they will need to
50 // be stored in that order in the final string table.
51 //
52 // 3. Build a list of keys (UChar32s) from the four mapping tables. Sort the
53 // list because that will be the ordering of our runtime table.
54 //
55 // 4. Generate the run time string table. This is generated before the key & value
56 // tables because we need the string indexes when building those tables.
57 //
58 // 5. Build the run-time key and value tables. These are parallel tables, and are built
59 // at the same time
60 //
61
62 SPUString::SPUString(UnicodeString *s) {
63 fStr = s;
64 fStrTableIndex = 0;
65 }
66
67
68 SPUString::~SPUString() {
69 delete fStr;
70 }
71
72
73 SPUStringPool::SPUStringPool(UErrorCode &status) : fVec(NULL), fHash(NULL) {
74 fVec = new UVector(status);
75 fHash = uhash_open(uhash_hashUnicodeString, // key hash function
76 uhash_compareUnicodeString, // Key Comparator
77 NULL, // Value Comparator
78 &status);
79 }
80
81
82 SPUStringPool::~SPUStringPool() {
83 int i;
84 for (i=fVec->size()-1; i>=0; i--) {
85 SPUString *s = static_cast<SPUString *>(fVec->elementAt(i));
86 delete s;
87 }
88 delete fVec;
89 uhash_close(fHash);
90 }
91
92
93 int32_t SPUStringPool::size() {
94 return fVec->size();
95 }
96
97 SPUString *SPUStringPool::getByIndex(int32_t index) {
98 SPUString *retString = (SPUString *)fVec->elementAt(index);
99 return retString;
100 }
101
102
103 // Comparison function for ordering strings in the string pool.
104 // Compare by length first, then, within a group of the same length,
105 // by code point order.
106 // Conforms to the type signature for a USortComparator in uvector.h
107
108 static int8_t U_CALLCONV SPUStringCompare(UHashTok left, UHashTok right) {
109 const SPUString *sL = const_cast<const SPUString *>(
110 static_cast<SPUString *>(left.pointer));
111 const SPUString *sR = const_cast<const SPUString *>(
112 static_cast<SPUString *>(right.pointer));
113 int32_t lenL = sL->fStr->length();
114 int32_t lenR = sR->fStr->length();
115 if (lenL < lenR) {
116 return -1;
117 } else if (lenL > lenR) {
118 return 1;
119 } else {
120 return sL->fStr->compare(*(sR->fStr));
121 }
122 }
123
124 void SPUStringPool::sort(UErrorCode &status) {
125 fVec->sort(SPUStringCompare, status);
126 }
127
128
129 SPUString *SPUStringPool::addString(UnicodeString *src, UErrorCode &status) {
130 SPUString *hashedString = static_cast<SPUString *>(uhash_get(fHash, src));
131 if (hashedString != NULL) {
132 delete src;
133 } else {
134 hashedString = new SPUString(src);
135 uhash_put(fHash, src, hashedString, &status);
136 fVec->addElement(hashedString, status);
137 }
138 return hashedString;
139 }
140
141
142
143 ConfusabledataBuilder::ConfusabledataBuilder(SpoofImpl *spImpl, UErrorCode &status) :
144 fSpoofImpl(spImpl),
145 fInput(NULL),
146 fSLTable(NULL),
147 fSATable(NULL),
148 fMLTable(NULL),
149 fMATable(NULL),
150 fKeySet(NULL),
151 fKeyVec(NULL),
152 fValueVec(NULL),
153 fStringTable(NULL),
154 fStringLengthsTable(NULL),
155 stringPool(NULL),
156 fParseLine(NULL),
157 fParseHexNum(NULL),
158 fLineNum(0)
159 {
160 if (U_FAILURE(status)) {
161 return;
162 }
163 fSLTable = uhash_open(uhash_hashLong, uhash_compareLong, NULL, &status);
164 fSATable = uhash_open(uhash_hashLong, uhash_compareLong, NULL, &status);
165 fMLTable = uhash_open(uhash_hashLong, uhash_compareLong, NULL, &status);
166 fMATable = uhash_open(uhash_hashLong, uhash_compareLong, NULL, &status);
167 fKeySet = new UnicodeSet();
168 fKeyVec = new UVector(status);
169 fValueVec = new UVector(status);
170 stringPool = new SPUStringPool(status);
171 }
172
173
174 ConfusabledataBuilder::~ConfusabledataBuilder() {
175 uprv_free(fInput);
176 uregex_close(fParseLine);
177 uregex_close(fParseHexNum);
178 uhash_close(fSLTable);
179 uhash_close(fSATable);
180 uhash_close(fMLTable);
181 uhash_close(fMATable);
182 delete fKeySet;
183 delete fKeyVec;
184 delete fStringTable;
185 delete fStringLengthsTable;
186 delete fValueVec;
187 delete stringPool;
188 }
189
190
191 void ConfusabledataBuilder::buildConfusableData(SpoofImpl * spImpl, const char * confusables,
192 int32_t confusablesLen, int32_t *errorType, UParseError *pe, UErrorCode &status) {
193
194 if (U_FAILURE(status)) {
195 return;
196 }
197 ConfusabledataBuilder builder(spImpl, status);
198 builder.build(confusables, confusablesLen, status);
199 if (U_FAILURE(status) && errorType != NULL) {
200 *errorType = USPOOF_SINGLE_SCRIPT_CONFUSABLE;
201 pe->line = builder.fLineNum;
202 }
203 }
204
205
206 void ConfusabledataBuilder::build(const char * confusables, int32_t confusablesLen,
207 UErrorCode &status) {
208
209 // Convert the user input data from UTF-8 to UChar (UTF-16)
210 int32_t inputLen = 0;
211 if (U_FAILURE(status)) {
212 return;
213 }
214 u_strFromUTF8(NULL, 0, &inputLen, confusables, confusablesLen, &status);
215 if (status != U_BUFFER_OVERFLOW_ERROR) {
216 return;
217 }
218 status = U_ZERO_ERROR;
219 fInput = static_cast<UChar *>(uprv_malloc((inputLen+1) * sizeof(UChar)));
220 if (fInput == NULL) {
221 status = U_MEMORY_ALLOCATION_ERROR;
222 return;
223 }
224 u_strFromUTF8(fInput, inputLen+1, NULL, confusables, confusablesLen, &status);
225
226
227 // Regular Expression to parse a line from Confusables.txt. The expression will match
228 // any line. What was matched is determined by examining which capture groups have a match.
229 // Capture Group 1: the source char
230 // Capture Group 2: the replacement chars
231 // Capture Group 3-6 the table type, SL, SA, ML, or MA
232 // Capture Group 7: A blank or comment only line.
233 // Capture Group 8: A syntactically invalid line. Anything that didn't match before.
234 // Example Line from the confusables.txt source file:
235 // "1D702 ; 006E 0329 ; SL # MATHEMATICAL ITALIC SMALL ETA ... "
236 UnicodeString pattern(
237 "(?m)^[ \\t]*([0-9A-Fa-f]+)[ \\t]+;" // Match the source char
238 "[ \\t]*([0-9A-Fa-f]+" // Match the replacement char(s)
239 "(?:[ \\t]+[0-9A-Fa-f]+)*)[ \\t]*;" // (continued)
240 "\\s*(?:(SL)|(SA)|(ML)|(MA))" // Match the table type
241 "[ \\t]*(?:#.*?)?$" // Match any trailing #comment
242 "|^([ \\t]*(?:#.*?)?)$" // OR match empty lines or lines with only a #comment
243 "|^(.*?)$", -1, US_INV); // OR match any line, which catches illegal lines.
244 // TODO: Why are we using the regex C API here? C++ would just take UnicodeString...
245 fParseLine = uregex_open(pattern.getBuffer(), pattern.length(), 0, NULL, &status);
246
247 // Regular expression for parsing a hex number out of a space-separated list of them.
248 // Capture group 1 gets the number, with spaces removed.
249 pattern = UNICODE_STRING_SIMPLE("\\s*([0-9A-F]+)");
250 fParseHexNum = uregex_open(pattern.getBuffer(), pattern.length(), 0, NULL, &status);
251
252 // Zap any Byte Order Mark at the start of input. Changing it to a space is benign
253 // given the syntax of the input.
254 if (*fInput == 0xfeff) {
255 *fInput = 0x20;
256 }
257
258 // Parse the input, one line per iteration of this loop.
259 uregex_setText(fParseLine, fInput, inputLen, &status);
260 while (uregex_findNext(fParseLine, &status)) {
261 fLineNum++;
262 if (uregex_start(fParseLine, 7, &status) >= 0) {
263 // this was a blank or comment line.
264 continue;
265 }
266 if (uregex_start(fParseLine, 8, &status) >= 0) {
267 // input file syntax error.
268 status = U_PARSE_ERROR;
269 return;
270 }
271
272 // We have a good input line. Extract the key character and mapping string, and
273 // put them into the appropriate mapping table.
274 UChar32 keyChar = SpoofImpl::ScanHex(fInput, uregex_start(fParseLine, 1, &status),
275 uregex_end(fParseLine, 1, &status), status);
276
277 int32_t mapStringStart = uregex_start(fParseLine, 2, &status);
278 int32_t mapStringLength = uregex_end(fParseLine, 2, &status) - mapStringStart;
279 uregex_setText(fParseHexNum, &fInput[mapStringStart], mapStringLength, &status);
280
281 UnicodeString *mapString = new UnicodeString();
282 if (mapString == NULL) {
283 status = U_MEMORY_ALLOCATION_ERROR;
284 return;
285 }
286 while (uregex_findNext(fParseHexNum, &status)) {
287 UChar32 c = SpoofImpl::ScanHex(&fInput[mapStringStart], uregex_start(fParseHexNum, 1, &status),
288 uregex_end(fParseHexNum, 1, &status), status);
289 mapString->append(c);
290 }
291 U_ASSERT(mapString->length() >= 1);
292
293 // Put the map (value) string into the string pool
294 // This a little like a Java intern() - any duplicates will be eliminated.
295 SPUString *smapString = stringPool->addString(mapString, status);
296
297 // Add the UChar32 -> string mapping to the appropriate table.
298 UHashtable *table = uregex_start(fParseLine, 3, &status) >= 0 ? fSLTable :
299 uregex_start(fParseLine, 4, &status) >= 0 ? fSATable :
300 uregex_start(fParseLine, 5, &status) >= 0 ? fMLTable :
301 uregex_start(fParseLine, 6, &status) >= 0 ? fMATable :
302 NULL;
303 U_ASSERT(table != NULL);
304 uhash_iput(table, keyChar, smapString, &status);
305 fKeySet->add(keyChar);
306 if (U_FAILURE(status)) {
307 return;
308 }
309 }
310
311 // Input data is now all parsed and collected.
312 // Now create the run-time binary form of the data.
313 //
314 // This is done in two steps. First the data is assembled into vectors and strings,
315 // for ease of construction, then the contents of these collections are dumped
316 // into the actual raw-bytes data storage.
317
318 // Build up the string array, and record the index of each string therein
319 // in the (build time only) string pool.
320 // Strings of length one are not entered into the strings array.
321 // At the same time, build up the string lengths table, which records the
322 // position in the string table of the first string of each length >= 4.
323 // (Strings in the table are sorted by length)
324 stringPool->sort(status);
325 fStringTable = new UnicodeString();
326 fStringLengthsTable = new UVector(status);
327 int32_t previousStringLength = 0;
328 int32_t previousStringIndex = 0;
329 int32_t poolSize = stringPool->size();
330 int32_t i;
331 for (i=0; i<poolSize; i++) {
332 SPUString *s = stringPool->getByIndex(i);
333 int32_t strLen = s->fStr->length();
334 int32_t strIndex = fStringTable->length();
335 U_ASSERT(strLen >= previousStringLength);
336 if (strLen == 1) {
337 // strings of length one do not get an entry in the string table.
338 // Keep the single string character itself here, which is the same
339 // convention that is used in the final run-time string table index.
340 s->fStrTableIndex = s->fStr->charAt(0);
341 } else {
342 if ((strLen > previousStringLength) && (previousStringLength >= 4)) {
343 fStringLengthsTable->addElement(previousStringIndex, status);
344 fStringLengthsTable->addElement(previousStringLength, status);
345 }
346 s->fStrTableIndex = strIndex;
347 fStringTable->append(*(s->fStr));
348 }
349 previousStringLength = strLen;
350 previousStringIndex = strIndex;
351 }
352 // Make the final entry to the string lengths table.
353 // (it holds an entry for the _last_ string of each length, so adding the
354 // final one doesn't happen in the main loop because no longer string was encountered.)
355 if (previousStringLength >= 4) {
356 fStringLengthsTable->addElement(previousStringIndex, status);
357 fStringLengthsTable->addElement(previousStringLength, status);
358 }
359
360 // Construct the compile-time Key and Value tables
361 //
362 // For each key code point, check which mapping tables it applies to,
363 // and create the final data for the key & value structures.
364 //
365 // The four logical mapping tables are conflated into one combined table.
366 // If multiple logical tables have the same mapping for some key, they
367 // share a single entry in the combined table.
368 // If more than one mapping exists for the same key code point, multiple
369 // entries will be created in the table
370
371 for (int32_t range=0; range<fKeySet->getRangeCount(); range++) {
372 // It is an oddity of the UnicodeSet API that simply enumerating the contained
373 // code points requires a nested loop.
374 for (UChar32 keyChar=fKeySet->getRangeStart(range);
375 keyChar <= fKeySet->getRangeEnd(range); keyChar++) {
376 addKeyEntry(keyChar, fSLTable, USPOOF_SL_TABLE_FLAG, status);
377 addKeyEntry(keyChar, fSATable, USPOOF_SA_TABLE_FLAG, status);
378 addKeyEntry(keyChar, fMLTable, USPOOF_ML_TABLE_FLAG, status);
379 addKeyEntry(keyChar, fMATable, USPOOF_MA_TABLE_FLAG, status);
380 }
381 }
382
383 // Put the assembled data into the flat runtime array
384 outputData(status);
385
386 // All of the intermediate allocated data belongs to the ConfusabledataBuilder
387 // object (this), and is deleted in the destructor.
388 return;
389 }
390
391 //
392 // outputData The confusable data has been compiled and stored in intermediate
393 // collections and strings. Copy it from there to the final flat
394 // binary array.
395 //
396 // Note that as each section is added to the output data, the
397 // expand (reserveSpace() function will likely relocate it in memory.
398 // Be careful with pointers.
399 //
400 void ConfusabledataBuilder::outputData(UErrorCode &status) {
401
402 U_ASSERT(fSpoofImpl->fSpoofData->fDataOwned == TRUE);
403
404 // The Key Table
405 // While copying the keys to the runtime array,
406 // also sanity check that they are sorted.
407
408 int32_t numKeys = fKeyVec->size();
409 int32_t *keys =
410 static_cast<int32_t *>(fSpoofImpl->fSpoofData->reserveSpace(numKeys*sizeof(int32_t), status));
411 if (U_FAILURE(status)) {
412 return;
413 }
414 int i;
415 int32_t previousKey = 0;
416 for (i=0; i<numKeys; i++) {
417 int32_t key = fKeyVec->elementAti(i);
418 (void)previousKey; // Suppress unused variable warning on gcc.
419 U_ASSERT((key & 0x00ffffff) >= (previousKey & 0x00ffffff));
420 U_ASSERT((key & 0xff000000) != 0);
421 keys[i] = key;
422 previousKey = key;
423 }
424 SpoofDataHeader *rawData = fSpoofImpl->fSpoofData->fRawData;
425 rawData->fCFUKeys = (int32_t)((char *)keys - (char *)rawData);
426 rawData->fCFUKeysSize = numKeys;
427 fSpoofImpl->fSpoofData->fCFUKeys = keys;
428
429
430 // The Value Table, parallels the key table
431 int32_t numValues = fValueVec->size();
432 U_ASSERT(numKeys == numValues);
433 uint16_t *values =
434 static_cast<uint16_t *>(fSpoofImpl->fSpoofData->reserveSpace(numKeys*sizeof(uint16_t), status));
435 if (U_FAILURE(status)) {
436 return;
437 }
438 for (i=0; i<numValues; i++) {
439 uint32_t value = static_cast<uint32_t>(fValueVec->elementAti(i));
440 U_ASSERT(value < 0xffff);
441 values[i] = static_cast<uint16_t>(value);
442 }
443 rawData = fSpoofImpl->fSpoofData->fRawData;
444 rawData->fCFUStringIndex = (int32_t)((char *)values - (char *)rawData);
445 rawData->fCFUStringIndexSize = numValues;
446 fSpoofImpl->fSpoofData->fCFUValues = values;
447
448 // The Strings Table.
449
450 uint32_t stringsLength = fStringTable->length();
451 // Reserve an extra space so the string will be nul-terminated. This is
452 // only a convenience, for when debugging; it is not needed otherwise.
453 UChar *strings =
454 static_cast<UChar *>(fSpoofImpl->fSpoofData->reserveSpace(stringsLength*sizeof(UChar)+2, status));
455 if (U_FAILURE(status)) {
456 return;
457 }
458 fStringTable->extract(strings, stringsLength+1, status);
459 rawData = fSpoofImpl->fSpoofData->fRawData;
460 U_ASSERT(rawData->fCFUStringTable == 0);
461 rawData->fCFUStringTable = (int32_t)((char *)strings - (char *)rawData);
462 rawData->fCFUStringTableLen = stringsLength;
463 fSpoofImpl->fSpoofData->fCFUStrings = strings;
464
465 // The String Lengths Table
466 // While copying into the runtime array do some sanity checks on the values
467 // Each complete entry contains two fields, an index and an offset.
468 // Lengths should increase with each entry.
469 // Offsets should be less than the size of the string table.
470 int32_t lengthTableLength = fStringLengthsTable->size();
471 uint16_t *stringLengths =
472 static_cast<uint16_t *>(fSpoofImpl->fSpoofData->reserveSpace(lengthTableLength*sizeof(uint16_t), status));
473 if (U_FAILURE(status)) {
474 return;
475 }
476 int32_t destIndex = 0;
477 uint32_t previousLength = 0;
478 for (i=0; i<lengthTableLength; i+=2) {
479 uint32_t offset = static_cast<uint32_t>(fStringLengthsTable->elementAti(i));
480 uint32_t length = static_cast<uint32_t>(fStringLengthsTable->elementAti(i+1));
481 U_ASSERT(offset < stringsLength);
482 U_ASSERT(length < 40);
483 (void)previousLength; // Suppress unused variable warning on gcc.
484 U_ASSERT(length > previousLength);
485 stringLengths[destIndex++] = static_cast<uint16_t>(offset);
486 stringLengths[destIndex++] = static_cast<uint16_t>(length);
487 previousLength = length;
488 }
489 rawData = fSpoofImpl->fSpoofData->fRawData;
490 rawData->fCFUStringLengths = (int32_t)((char *)stringLengths - (char *)rawData);
491 // Note: StringLengthsSize in the raw data is the number of complete entries,
492 // each consisting of a pair of 16 bit values, hence the divide by 2.
493 rawData->fCFUStringLengthsSize = lengthTableLength / 2;
494 fSpoofImpl->fSpoofData->fCFUStringLengths =
495 reinterpret_cast<SpoofStringLengthsElement *>(stringLengths);
496 }
497
498
499
500 // addKeyEntry Construction of the confusable Key and Mapping Values tables.
501 // This is an intermediate point in the building process.
502 // We already have the mappings in the hash tables fSLTable, etc.
503 // This function builds corresponding run-time style table entries into
504 // fKeyVec and fValueVec
505
506 void ConfusabledataBuilder::addKeyEntry(
507 UChar32 keyChar, // The key character
508 UHashtable *table, // The table, one of SATable, MATable, etc.
509 int32_t tableFlag, // One of USPOOF_SA_TABLE_FLAG, etc.
510 UErrorCode &status) {
511
512 SPUString *targetMapping = static_cast<SPUString *>(uhash_iget(table, keyChar));
513 if (targetMapping == NULL) {
514 // No mapping for this key character.
515 // (This function is called for all four tables for each key char that
516 // is seen anywhere, so this no entry cases are very much expected.)
517 return;
518 }
519
520 // Check whether there is already an entry with the correct mapping.
521 // If so, simply set the flag in the keyTable saying that the existing entry
522 // applies to the table that we're doing now.
523
524 UBool keyHasMultipleValues = FALSE;
525 int32_t i;
526 for (i=fKeyVec->size()-1; i>=0 ; i--) {
527 int32_t key = fKeyVec->elementAti(i);
528 if ((key & 0x0ffffff) != keyChar) {
529 // We have now checked all existing key entries for this key char (if any)
530 // without finding one with the same mapping.
531 break;
532 }
533 UnicodeString mapping = getMapping(i);
534 if (mapping == *(targetMapping->fStr)) {
535 // The run time entry we are currently testing has the correct mapping.
536 // Set the flag in it indicating that it applies to the new table also.
537 key |= tableFlag;
538 fKeyVec->setElementAt(key, i);
539 return;
540 }
541 keyHasMultipleValues = TRUE;
542 }
543
544 // Need to add a new entry to the binary data being built for this mapping.
545 // Includes adding entries to both the key table and the parallel values table.
546
547 int32_t newKey = keyChar | tableFlag;
548 if (keyHasMultipleValues) {
549 newKey |= USPOOF_KEY_MULTIPLE_VALUES;
550 }
551 int32_t adjustedMappingLength = targetMapping->fStr->length() - 1;
552 if (adjustedMappingLength>3) {
553 adjustedMappingLength = 3;
554 }
555 newKey |= adjustedMappingLength << USPOOF_KEY_LENGTH_SHIFT;
556
557 int32_t newData = targetMapping->fStrTableIndex;
558
559 fKeyVec->addElement(newKey, status);
560 fValueVec->addElement(newData, status);
561
562 // If the preceding key entry is for the same key character (but with a different mapping)
563 // set the multiple-values flag on it.
564 if (keyHasMultipleValues) {
565 int32_t previousKeyIndex = fKeyVec->size() - 2;
566 int32_t previousKey = fKeyVec->elementAti(previousKeyIndex);
567 previousKey |= USPOOF_KEY_MULTIPLE_VALUES;
568 fKeyVec->setElementAt(previousKey, previousKeyIndex);
569 }
570 }
571
572
573
574 UnicodeString ConfusabledataBuilder::getMapping(int32_t index) {
575 int32_t key = fKeyVec->elementAti(index);
576 int32_t value = fValueVec->elementAti(index);
577 int32_t length = USPOOF_KEY_LENGTH_FIELD(key);
578 int32_t lastIndexWithLen;
579 switch (length) {
580 case 0:
581 return UnicodeString(static_cast<UChar>(value));
582 case 1:
583 case 2:
584 return UnicodeString(*fStringTable, value, length+1);
585 case 3:
586 length = 0;
587 int32_t i;
588 for (i=0; i<fStringLengthsTable->size(); i+=2) {
589 lastIndexWithLen = fStringLengthsTable->elementAti(i);
590 if (value <= lastIndexWithLen) {
591 length = fStringLengthsTable->elementAti(i+1);
592 break;
593 }
594 }
595 U_ASSERT(length>=3);
596 return UnicodeString(*fStringTable, value, length);
597 default:
598 U_ASSERT(FALSE);
599 }
600 return UnicodeString();
601 }
602
603 #endif
604 #endif // !UCONFIG_NO_REGULAR_EXPRESSIONS
605

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