icuSources/i18n/plurfmt.cpp

   1 /*
   2 *******************************************************************************
   3 * Copyright (C) 2009-2015, International Business Machines Corporation and
   4 * others. All Rights Reserved.
   5 *******************************************************************************
   6 *
   7 * File PLURFMT.CPP
   8 *******************************************************************************
   9 */
  10
  11 #include "unicode/decimfmt.h"
  12 #include "unicode/messagepattern.h"
  13 #include "unicode/plurfmt.h"
  14 #include "unicode/plurrule.h"
  15 #include "unicode/utypes.h"
  16 #include "cmemory.h"
  17 #include "messageimpl.h"
  18 #include "nfrule.h"
  19 #include "plurrule_impl.h"
  20 #include "uassert.h"
  21 #include "uhash.h"
  22 #include "precision.h"
  23 #include "visibledigits.h"
  24
  25 #if !UCONFIG_NO_FORMATTING
  26
  27 U_NAMESPACE_BEGIN
  28
  29 static const UChar OTHER_STRING[] = {
  30     0x6F, 0x74, 0x68, 0x65, 0x72, 0  // "other"
  31 };
  32
  33 UOBJECT_DEFINE_RTTI_IMPLEMENTATION(PluralFormat)
  34
  35 PluralFormat::PluralFormat(UErrorCode& status)
  36         : locale(Locale::getDefault()),
  37           msgPattern(status),
  38           numberFormat(NULL),
  39           offset(0) {
  40     init(NULL, UPLURAL_TYPE_CARDINAL, status);
  41 }
  42
  43 PluralFormat::PluralFormat(const Locale& loc, UErrorCode& status)
  44         : locale(loc),
  45           msgPattern(status),
  46           numberFormat(NULL),
  47           offset(0) {
  48     init(NULL, UPLURAL_TYPE_CARDINAL, status);
  49 }
  50
  51 PluralFormat::PluralFormat(const PluralRules& rules, UErrorCode& status)
  52         : locale(Locale::getDefault()),
  53           msgPattern(status),
  54           numberFormat(NULL),
  55           offset(0) {
  56     init(&rules, UPLURAL_TYPE_COUNT, status);
  57 }
  58
  59 PluralFormat::PluralFormat(const Locale& loc,
  60                            const PluralRules& rules,
  61                            UErrorCode& status)
  62         : locale(loc),
  63           msgPattern(status),
  64           numberFormat(NULL),
  65           offset(0) {
  66     init(&rules, UPLURAL_TYPE_COUNT, status);
  67 }
  68
  69 PluralFormat::PluralFormat(const Locale& loc,
  70                            UPluralType type,
  71                            UErrorCode& status)
  72         : locale(loc),
  73           msgPattern(status),
  74           numberFormat(NULL),
  75           offset(0) {
  76     init(NULL, type, status);
  77 }
  78
  79 PluralFormat::PluralFormat(const UnicodeString& pat,
  80                            UErrorCode& status)
  81         : locale(Locale::getDefault()),
  82           msgPattern(status),
  83           numberFormat(NULL),
  84           offset(0) {
  85     init(NULL, UPLURAL_TYPE_CARDINAL, status);
  86     applyPattern(pat, status);
  87 }
  88
  89 PluralFormat::PluralFormat(const Locale& loc,
  90                            const UnicodeString& pat,
  91                            UErrorCode& status)
  92         : locale(loc),
  93           msgPattern(status),
  94           numberFormat(NULL),
  95           offset(0) {
  96     init(NULL, UPLURAL_TYPE_CARDINAL, status);
  97     applyPattern(pat, status);
  98 }
  99
 100 PluralFormat::PluralFormat(const PluralRules& rules,
 101                            const UnicodeString& pat,
 102                            UErrorCode& status)
 103         : locale(Locale::getDefault()),
 104           msgPattern(status),
 105           numberFormat(NULL),
 106           offset(0) {
 107     init(&rules, UPLURAL_TYPE_COUNT, status);
 108     applyPattern(pat, status);
 109 }
 110
 111 PluralFormat::PluralFormat(const Locale& loc,
 112                            const PluralRules& rules,
 113                            const UnicodeString& pat,
 114                            UErrorCode& status)
 115         : locale(loc),
 116           msgPattern(status),
 117           numberFormat(NULL),
 118           offset(0) {
 119     init(&rules, UPLURAL_TYPE_COUNT, status);
 120     applyPattern(pat, status);
 121 }
 122
 123 PluralFormat::PluralFormat(const Locale& loc,
 124                            UPluralType type,
 125                            const UnicodeString& pat,
 126                            UErrorCode& status)
 127         : locale(loc),
 128           msgPattern(status),
 129           numberFormat(NULL),
 130           offset(0) {
 131     init(NULL, type, status);
 132     applyPattern(pat, status);
 133 }
 134
 135 PluralFormat::PluralFormat(const PluralFormat& other)
 136         : Format(other),
 137           locale(other.locale),
 138           msgPattern(other.msgPattern),
 139           numberFormat(NULL),
 140           offset(other.offset) {
 141     copyObjects(other);
 142 }
 143
 144 void
 145 PluralFormat::copyObjects(const PluralFormat& other) {
 146     UErrorCode status = U_ZERO_ERROR;
 147     if (numberFormat != NULL) {
 148         delete numberFormat;
 149     }
 150     if (pluralRulesWrapper.pluralRules != NULL) {
 151         delete pluralRulesWrapper.pluralRules;
 152     }
 153
 154     if (other.numberFormat == NULL) {
 155         numberFormat = NumberFormat::createInstance(locale, status);
 156     } else {
 157         numberFormat = (NumberFormat*)other.numberFormat->clone();
 158     }
 159     if (other.pluralRulesWrapper.pluralRules == NULL) {
 160         pluralRulesWrapper.pluralRules = PluralRules::forLocale(locale, status);
 161     } else {
 162         pluralRulesWrapper.pluralRules = other.pluralRulesWrapper.pluralRules->clone();
 163     }
 164 }
 165
 166
 167 PluralFormat::~PluralFormat() {
 168     delete numberFormat;
 169 }
 170
 171 void
 172 PluralFormat::init(const PluralRules* rules, UPluralType type, UErrorCode& status) {
 173     if (U_FAILURE(status)) {
 174         return;
 175     }
 176
 177     if (rules==NULL) {
 178         pluralRulesWrapper.pluralRules = PluralRules::forLocale(locale, type, status);
 179     } else {
 180         pluralRulesWrapper.pluralRules = rules->clone();
 181         if (pluralRulesWrapper.pluralRules == NULL) {
 182             status = U_MEMORY_ALLOCATION_ERROR;
 183             return;
 184         }
 185     }
 186
 187     numberFormat= NumberFormat::createInstance(locale, status);
 188 }
 189
 190 void
 191 PluralFormat::applyPattern(const UnicodeString& newPattern, UErrorCode& status) {
 192     msgPattern.parsePluralStyle(newPattern, NULL, status);
 193     if (U_FAILURE(status)) {
 194         msgPattern.clear();
 195         offset = 0;
 196         return;
 197     }
 198     offset = msgPattern.getPluralOffset(0);
 199 }
 200
 201 UnicodeString&
 202 PluralFormat::format(const Formattable& obj,
 203                    UnicodeString& appendTo,
 204                    FieldPosition& pos,
 205                    UErrorCode& status) const
 206 {
 207     if (U_FAILURE(status)) return appendTo;
 208
 209     if (obj.isNumeric()) {
 210         return format(obj, obj.getDouble(), appendTo, pos, status);
 211     } else {
 212         status = U_ILLEGAL_ARGUMENT_ERROR;
 213         return appendTo;
 214     }
 215 }
 216
 217 UnicodeString
 218 PluralFormat::format(int32_t number, UErrorCode& status) const {
 219     FieldPosition fpos(0);
 220     UnicodeString result;
 221     return format(Formattable(number), number, result, fpos, status);
 222 }
 223
 224 UnicodeString
 225 PluralFormat::format(double number, UErrorCode& status) const {
 226     FieldPosition fpos(0);
 227     UnicodeString result;
 228     return format(Formattable(number), number, result, fpos, status);
 229 }
 230
 231
 232 UnicodeString&
 233 PluralFormat::format(int32_t number,
 234                      UnicodeString& appendTo,
 235                      FieldPosition& pos,
 236                      UErrorCode& status) const {
 237     return format(Formattable(number), (double)number, appendTo, pos, status);
 238 }
 239
 240 UnicodeString&
 241 PluralFormat::format(double number,
 242                      UnicodeString& appendTo,
 243                      FieldPosition& pos,
 244                      UErrorCode& status) const {
 245     return format(Formattable(number), (double)number, appendTo, pos, status);
 246 }
 247
 248 UnicodeString&
 249 PluralFormat::format(const Formattable& numberObject, double number,
 250                      UnicodeString& appendTo,
 251                      FieldPosition& pos,
 252                      UErrorCode& status) const {
 253     if (U_FAILURE(status)) {
 254         return appendTo;
 255     }
 256     if (msgPattern.countParts() == 0) {
 257         return numberFormat->format(numberObject, appendTo, pos, status);
 258     }
 259     // Get the appropriate sub-message.
 260     // Select it based on the formatted number-offset.
 261     double numberMinusOffset = number - offset;
 262     UnicodeString numberString;
 263     FieldPosition ignorePos;
 264     FixedPrecision fp;
 265     VisibleDigitsWithExponent dec;
 266     fp.initVisibleDigitsWithExponent(numberMinusOffset, dec, status);
 267     if (U_FAILURE(status)) {
 268         return appendTo;
 269     }
 270     if (offset == 0) {
 271         DecimalFormat *decFmt = dynamic_cast<DecimalFormat *>(numberFormat);
 272         if(decFmt != NULL) {
 273             decFmt->initVisibleDigitsWithExponent(
 274                     numberObject, dec, status);
 275             if (U_FAILURE(status)) {
 276                 return appendTo;
 277             }
 278             decFmt->format(dec, numberString, ignorePos, status);
 279         } else {
 280             numberFormat->format(
 281                     numberObject, numberString, ignorePos, status);  // could be BigDecimal etc.
 282         }
 283     } else {
 284         DecimalFormat *decFmt = dynamic_cast<DecimalFormat *>(numberFormat);
 285         if(decFmt != NULL) {
 286             decFmt->initVisibleDigitsWithExponent(
 287                     numberMinusOffset, dec, status);
 288             if (U_FAILURE(status)) {
 289                 return appendTo;
 290             }
 291             decFmt->format(dec, numberString, ignorePos, status);
 292         } else {
 293             numberFormat->format(
 294                     numberMinusOffset, numberString, ignorePos, status);
 295         }
 296     }
 297     int32_t partIndex = findSubMessage(msgPattern, 0, pluralRulesWrapper, &dec, number, status);
 298     if (U_FAILURE(status)) { return appendTo; }
 299     // Replace syntactic # signs in the top level of this sub-message
 300     // (not in nested arguments) with the formatted number-offset.
 301     const UnicodeString& pattern = msgPattern.getPatternString();
 302     int32_t prevIndex = msgPattern.getPart(partIndex).getLimit();
 303     for (;;) {
 304         const MessagePattern::Part& part = msgPattern.getPart(++partIndex);
 305         const UMessagePatternPartType type = part.getType();
 306         int32_t index = part.getIndex();
 307         if (type == UMSGPAT_PART_TYPE_MSG_LIMIT) {
 308             return appendTo.append(pattern, prevIndex, index - prevIndex);
 309         } else if ((type == UMSGPAT_PART_TYPE_REPLACE_NUMBER) ||
 310             (type == UMSGPAT_PART_TYPE_SKIP_SYNTAX && MessageImpl::jdkAposMode(msgPattern))) {
 311             appendTo.append(pattern, prevIndex, index - prevIndex);
 312             if (type == UMSGPAT_PART_TYPE_REPLACE_NUMBER) {
 313                 appendTo.append(numberString);
 314             }
 315             prevIndex = part.getLimit();
 316         } else if (type == UMSGPAT_PART_TYPE_ARG_START) {
 317             appendTo.append(pattern, prevIndex, index - prevIndex);
 318             prevIndex = index;
 319             partIndex = msgPattern.getLimitPartIndex(partIndex);
 320             index = msgPattern.getPart(partIndex).getLimit();
 321             MessageImpl::appendReducedApostrophes(pattern, prevIndex, index, appendTo);
 322             prevIndex = index;
 323         }
 324     }
 325 }
 326
 327 UnicodeString&
 328 PluralFormat::toPattern(UnicodeString& appendTo) {
 329     if (0 == msgPattern.countParts()) {
 330         appendTo.setToBogus();
 331     } else {
 332         appendTo.append(msgPattern.getPatternString());
 333     }
 334     return appendTo;
 335 }
 336
 337 void
 338 PluralFormat::setLocale(const Locale& loc, UErrorCode& status) {
 339     if (U_FAILURE(status)) {
 340         return;
 341     }
 342     locale = loc;
 343     msgPattern.clear();
 344     delete numberFormat;
 345     offset = 0;
 346     numberFormat = NULL;
 347     pluralRulesWrapper.reset();
 348     init(NULL, UPLURAL_TYPE_CARDINAL, status);
 349 }
 350
 351 void
 352 PluralFormat::setNumberFormat(const NumberFormat* format, UErrorCode& status) {
 353     if (U_FAILURE(status)) {
 354         return;
 355     }
 356     NumberFormat* nf = (NumberFormat*)format->clone();
 357     if (nf != NULL) {
 358         delete numberFormat;
 359         numberFormat = nf;
 360     } else {
 361         status = U_MEMORY_ALLOCATION_ERROR;
 362     }
 363 }
 364
 365 Format*
 366 PluralFormat::clone() const
 367 {
 368     return new PluralFormat(*this);
 369 }
 370
 371
 372 PluralFormat&
 373 PluralFormat::operator=(const PluralFormat& other) {
 374     if (this != &other) {
 375         locale = other.locale;
 376         msgPattern = other.msgPattern;
 377         offset = other.offset;
 378         copyObjects(other);
 379     }
 380
 381     return *this;
 382 }
 383
 384 UBool
 385 PluralFormat::operator==(const Format& other) const {
 386     if (this == &other) {
 387         return TRUE;
 388     }
 389     if (!Format::operator==(other)) {
 390         return FALSE;
 391     }
 392     const PluralFormat& o = (const PluralFormat&)other;
 393     return
 394         locale == o.locale &&
 395         msgPattern == o.msgPattern &&  // implies same offset
 396         (numberFormat == NULL) == (o.numberFormat == NULL) &&
 397         (numberFormat == NULL || *numberFormat == *o.numberFormat) &&
 398         (pluralRulesWrapper.pluralRules == NULL) == (o.pluralRulesWrapper.pluralRules == NULL) &&
 399         (pluralRulesWrapper.pluralRules == NULL ||
 400             *pluralRulesWrapper.pluralRules == *o.pluralRulesWrapper.pluralRules);
 401 }
 402
 403 UBool
 404 PluralFormat::operator!=(const Format& other) const {
 405     return  !operator==(other);
 406 }
 407
 408 void
 409 PluralFormat::parseObject(const UnicodeString& /*source*/,
 410                         Formattable& /*result*/,
 411                         ParsePosition& pos) const
 412 {
 413     // Parsing not supported.
 414     pos.setErrorIndex(pos.getIndex());
 415 }
 416
 417 int32_t PluralFormat::findSubMessage(const MessagePattern& pattern, int32_t partIndex,
 418                                      const PluralSelector& selector, void *context,
 419                                      double number, UErrorCode& ec) {
 420     if (U_FAILURE(ec)) {
 421         return 0;
 422     }
 423     int32_t count=pattern.countParts();
 424     double offset;
 425     const MessagePattern::Part* part=&pattern.getPart(partIndex);
 426     if (MessagePattern::Part::hasNumericValue(part->getType())) {
 427         offset=pattern.getNumericValue(*part);
 428         ++partIndex;
 429     } else {
 430         offset=0;
 431     }
 432     // The keyword is empty until we need to match against a non-explicit, not-"other" value.
 433     // Then we get the keyword from the selector.
 434     // (In other words, we never call the selector if we match against an explicit value,
 435     // or if the only non-explicit keyword is "other".)
 436     UnicodeString keyword;
 437     UnicodeString other(FALSE, OTHER_STRING, 5);
 438     // When we find a match, we set msgStart>0 and also set this boolean to true
 439     // to avoid matching the keyword again (duplicates are allowed)
 440     // while we continue to look for an explicit-value match.
 441     UBool haveKeywordMatch=FALSE;
 442     // msgStart is 0 until we find any appropriate sub-message.
 443     // We remember the first "other" sub-message if we have not seen any
 444     // appropriate sub-message before.
 445     // We remember the first matching-keyword sub-message if we have not seen
 446     // one of those before.
 447     // (The parser allows [does not check for] duplicate keywords.
 448     // We just have to make sure to take the first one.)
 449     // We avoid matching the keyword twice by also setting haveKeywordMatch=true
 450     // at the first keyword match.
 451     // We keep going until we find an explicit-value match or reach the end of the plural style.
 452     int32_t msgStart=0;
 453     // Iterate over (ARG_SELECTOR [ARG_INT|ARG_DOUBLE] message) tuples
 454     // until ARG_LIMIT or end of plural-only pattern.
 455     do {
 456         part=&pattern.getPart(partIndex++);
 457         const UMessagePatternPartType type = part->getType();
 458         if(type==UMSGPAT_PART_TYPE_ARG_LIMIT) {
 459             break;
 460         }
 461         U_ASSERT (type==UMSGPAT_PART_TYPE_ARG_SELECTOR);
 462         // part is an ARG_SELECTOR followed by an optional explicit value, and then a message
 463         if(MessagePattern::Part::hasNumericValue(pattern.getPartType(partIndex))) {
 464             // explicit value like "=2"
 465             part=&pattern.getPart(partIndex++);
 466             if(number==pattern.getNumericValue(*part)) {
 467                 // matches explicit value
 468                 return partIndex;
 469             }
 470         } else if(!haveKeywordMatch) {
 471             // plural keyword like "few" or "other"
 472             // Compare "other" first and call the selector if this is not "other".
 473             if(pattern.partSubstringMatches(*part, other)) {
 474                 if(msgStart==0) {
 475                     msgStart=partIndex;
 476                     if(0 == keyword.compare(other)) {
 477                         // This is the first "other" sub-message,
 478                         // and the selected keyword is also "other".
 479                         // Do not match "other" again.
 480                         haveKeywordMatch=TRUE;
 481                     }
 482                 }
 483             } else {
 484                 if(keyword.isEmpty()) {
 485                     keyword=selector.select(context, number-offset, ec);
 486                     if(msgStart!=0 && (0 == keyword.compare(other))) {
 487                         // We have already seen an "other" sub-message.
 488                         // Do not match "other" again.
 489                         haveKeywordMatch=TRUE;
 490                         // Skip keyword matching but do getLimitPartIndex().
 491                     }
 492                 }
 493                 if(!haveKeywordMatch && pattern.partSubstringMatches(*part, keyword)) {
 494                     // keyword matches
 495                     msgStart=partIndex;
 496                     // Do not match this keyword again.
 497                     haveKeywordMatch=TRUE;
 498                 }
 499             }
 500         }
 501         partIndex=pattern.getLimitPartIndex(partIndex);
 502     } while(++partIndex<count);
 503     return msgStart;
 504 }
 505
 506 void PluralFormat::parseType(const UnicodeString& source, const NFRule *rbnfLenientScanner, Formattable& result, FieldPosition& pos) const {
 507     // If no pattern was applied, return null.
 508     if (msgPattern.countParts() == 0) {
 509         pos.setBeginIndex(-1);
 510         pos.setEndIndex(-1);
 511         return;
 512     }
 513     int partIndex = 0;
 514     int currMatchIndex;
 515     int count=msgPattern.countParts();
 516     int startingAt = pos.getBeginIndex();
 517     if (startingAt < 0) {
 518         startingAt = 0;
 519     }
 520
 521     // The keyword is null until we need to match against a non-explicit, not-"other" value.
 522     // Then we get the keyword from the selector.
 523     // (In other words, we never call the selector if we match against an explicit value,
 524     // or if the only non-explicit keyword is "other".)
 525     UnicodeString keyword;
 526     UnicodeString matchedWord;
 527     const UnicodeString& pattern = msgPattern.getPatternString();
 528     int matchedIndex = -1;
 529     // Iterate over (ARG_SELECTOR ARG_START message ARG_LIMIT) tuples
 530     // until the end of the plural-only pattern.
 531     while (partIndex < count) {
 532         const MessagePattern::Part* partSelector = &msgPattern.getPart(partIndex++);
 533         if (partSelector->getType() != UMSGPAT_PART_TYPE_ARG_SELECTOR) {
 534             // Bad format
 535             continue;
 536         }
 537
 538         const MessagePattern::Part* partStart = &msgPattern.getPart(partIndex++);
 539         if (partStart->getType() != UMSGPAT_PART_TYPE_MSG_START) {
 540             // Bad format
 541             continue;
 542         }
 543
 544         const MessagePattern::Part* partLimit = &msgPattern.getPart(partIndex++);
 545         if (partLimit->getType() != UMSGPAT_PART_TYPE_MSG_LIMIT) {
 546             // Bad format
 547             continue;
 548         }
 549
 550         UnicodeString currArg = pattern.tempSubString(partStart->getLimit(), partLimit->getIndex() - partStart->getLimit());
 551         if (rbnfLenientScanner != NULL) {
 552             // If lenient parsing is turned ON, we've got some time consuming parsing ahead of us.
 553             int32_t length = -1;
 554             currMatchIndex = rbnfLenientScanner->findTextLenient(source, currArg, startingAt, &length);
 555         }
 556         else {
 557             currMatchIndex = source.indexOf(currArg, startingAt);
 558         }
 559         if (currMatchIndex >= 0 && currMatchIndex >= matchedIndex && currArg.length() > matchedWord.length()) {
 560             matchedIndex = currMatchIndex;
 561             matchedWord = currArg;
 562             keyword = pattern.tempSubString(partStart->getLimit(), partLimit->getIndex() - partStart->getLimit());
 563         }
 564     }
 565     if (matchedIndex >= 0) {
 566         pos.setBeginIndex(matchedIndex);
 567         pos.setEndIndex(matchedIndex + matchedWord.length());
 568         result.setString(keyword);
 569         return;
 570     }
 571
 572     // Not found!
 573     pos.setBeginIndex(-1);
 574     pos.setEndIndex(-1);
 575 }
 576
 577 PluralFormat::PluralSelector::~PluralSelector() {}
 578
 579 PluralFormat::PluralSelectorAdapter::~PluralSelectorAdapter() {
 580     delete pluralRules;
 581 }
 582
 583 UnicodeString PluralFormat::PluralSelectorAdapter::select(void *context, double number,
 584                                                           UErrorCode& /*ec*/) const {
 585     (void)number;  // unused except in the assertion
 586     VisibleDigitsWithExponent *dec=static_cast<VisibleDigitsWithExponent *>(context);
 587     return pluralRules->select(*dec);
 588 }
 589
 590 void PluralFormat::PluralSelectorAdapter::reset() {
 591     delete pluralRules;
 592     pluralRules = NULL;
 593 }
 594
 595
 596 U_NAMESPACE_END
 597
 598
 599 #endif /* #if !UCONFIG_NO_FORMATTING */
 600
 601 //eof