intl/icu/source/common/messagepattern.cpp

Wed, 31 Dec 2014 07:22:50 +0100

author
Michael Schloh von Bennewitz <michael@schloh.com>
date
Wed, 31 Dec 2014 07:22:50 +0100
branch
TOR_BUG_3246
changeset 4
fc2d59ddac77
permissions
-rw-r--r--

Correct previous dual key logic pending first delivery installment.

     1 /*
     2 *******************************************************************************
     3 *   Copyright (C) 2011-2012, International Business Machines
     4 *   Corporation and others.  All Rights Reserved.
     5 *******************************************************************************
     6 *   file name:  messagepattern.cpp
     7 *   encoding:   US-ASCII
     8 *   tab size:   8 (not used)
     9 *   indentation:4
    10 *
    11 *   created on: 2011mar14
    12 *   created by: Markus W. Scherer
    13 */
    15 #include "unicode/utypes.h"
    17 #if !UCONFIG_NO_FORMATTING
    19 #include "unicode/messagepattern.h"
    20 #include "unicode/unistr.h"
    21 #include "unicode/utf16.h"
    22 #include "cmemory.h"
    23 #include "cstring.h"
    24 #include "messageimpl.h"
    25 #include "patternprops.h"
    26 #include "putilimp.h"
    27 #include "uassert.h"
    29 U_NAMESPACE_BEGIN
    31 // Unicode character/code point constants ---------------------------------- ***
    33 static const UChar u_pound=0x23;
    34 static const UChar u_apos=0x27;
    35 static const UChar u_plus=0x2B;
    36 static const UChar u_comma=0x2C;
    37 static const UChar u_minus=0x2D;
    38 static const UChar u_dot=0x2E;
    39 static const UChar u_colon=0x3A;
    40 static const UChar u_lessThan=0x3C;
    41 static const UChar u_equal=0x3D;
    42 static const UChar u_A=0x41;
    43 static const UChar u_C=0x43;
    44 static const UChar u_D=0x44;
    45 static const UChar u_E=0x45;
    46 static const UChar u_H=0x48;
    47 static const UChar u_I=0x49;
    48 static const UChar u_L=0x4C;
    49 static const UChar u_N=0x4E;
    50 static const UChar u_O=0x4F;
    51 static const UChar u_P=0x50;
    52 static const UChar u_R=0x52;
    53 static const UChar u_S=0x53;
    54 static const UChar u_T=0x54;
    55 static const UChar u_U=0x55;
    56 static const UChar u_Z=0x5A;
    57 static const UChar u_a=0x61;
    58 static const UChar u_c=0x63;
    59 static const UChar u_d=0x64;
    60 static const UChar u_e=0x65;
    61 static const UChar u_f=0x66;
    62 static const UChar u_h=0x68;
    63 static const UChar u_i=0x69;
    64 static const UChar u_l=0x6C;
    65 static const UChar u_n=0x6E;
    66 static const UChar u_o=0x6F;
    67 static const UChar u_p=0x70;
    68 static const UChar u_r=0x72;
    69 static const UChar u_s=0x73;
    70 static const UChar u_t=0x74;
    71 static const UChar u_u=0x75;
    72 static const UChar u_z=0x7A;
    73 static const UChar u_leftCurlyBrace=0x7B;
    74 static const UChar u_pipe=0x7C;
    75 static const UChar u_rightCurlyBrace=0x7D;
    76 static const UChar u_lessOrEqual=0x2264;  // U+2264 is <=
    78 static const UChar kOffsetColon[]={  // "offset:"
    79     u_o, u_f, u_f, u_s, u_e, u_t, u_colon
    80 };
    82 static const UChar kOther[]={  // "other"
    83     u_o, u_t, u_h, u_e, u_r
    84 };
    86 // MessagePatternList ------------------------------------------------------ ***
    88 template<typename T, int32_t stackCapacity>
    89 class MessagePatternList : public UMemory {
    90 public:
    91     MessagePatternList() {}
    92     void copyFrom(const MessagePatternList<T, stackCapacity> &other,
    93                   int32_t length,
    94                   UErrorCode &errorCode);
    95     UBool ensureCapacityForOneMore(int32_t oldLength, UErrorCode &errorCode);
    96     UBool equals(const MessagePatternList<T, stackCapacity> &other, int32_t length) const {
    97         for(int32_t i=0; i<length; ++i) {
    98             if(a[i]!=other.a[i]) { return FALSE; }
    99         }
   100         return TRUE;
   101     }
   103     MaybeStackArray<T, stackCapacity> a;
   104 };
   106 template<typename T, int32_t stackCapacity>
   107 void
   108 MessagePatternList<T, stackCapacity>::copyFrom(
   109         const MessagePatternList<T, stackCapacity> &other,
   110         int32_t length,
   111         UErrorCode &errorCode) {
   112     if(U_SUCCESS(errorCode) && length>0) {
   113         if(length>a.getCapacity() && NULL==a.resize(length)) {
   114             errorCode=U_MEMORY_ALLOCATION_ERROR;
   115             return;
   116         }
   117         uprv_memcpy(a.getAlias(), other.a.getAlias(), length*sizeof(T));
   118     }
   119 }
   121 template<typename T, int32_t stackCapacity>
   122 UBool
   123 MessagePatternList<T, stackCapacity>::ensureCapacityForOneMore(int32_t oldLength, UErrorCode &errorCode) {
   124     if(U_FAILURE(errorCode)) {
   125         return FALSE;
   126     }
   127     if(a.getCapacity()>oldLength || a.resize(2*oldLength, oldLength)!=NULL) {
   128         return TRUE;
   129     }
   130     errorCode=U_MEMORY_ALLOCATION_ERROR;
   131     return FALSE;
   132 }
   134 // MessagePatternList specializations -------------------------------------- ***
   136 class MessagePatternDoubleList : public MessagePatternList<double, 8> {
   137 };
   139 class MessagePatternPartsList : public MessagePatternList<MessagePattern::Part, 32> {
   140 };
   142 // MessagePattern constructors etc. ---------------------------------------- ***
   144 MessagePattern::MessagePattern(UErrorCode &errorCode)
   145         : aposMode(UCONFIG_MSGPAT_DEFAULT_APOSTROPHE_MODE),
   146           partsList(NULL), parts(NULL), partsLength(0),
   147           numericValuesList(NULL), numericValues(NULL), numericValuesLength(0),
   148           hasArgNames(FALSE), hasArgNumbers(FALSE), needsAutoQuoting(FALSE) {
   149     init(errorCode);
   150 }
   152 MessagePattern::MessagePattern(UMessagePatternApostropheMode mode, UErrorCode &errorCode)
   153         : aposMode(mode),
   154           partsList(NULL), parts(NULL), partsLength(0),
   155           numericValuesList(NULL), numericValues(NULL), numericValuesLength(0),
   156           hasArgNames(FALSE), hasArgNumbers(FALSE), needsAutoQuoting(FALSE) {
   157     init(errorCode);
   158 }
   160 MessagePattern::MessagePattern(const UnicodeString &pattern, UParseError *parseError, UErrorCode &errorCode)
   161         : aposMode(UCONFIG_MSGPAT_DEFAULT_APOSTROPHE_MODE),
   162           partsList(NULL), parts(NULL), partsLength(0),
   163           numericValuesList(NULL), numericValues(NULL), numericValuesLength(0),
   164           hasArgNames(FALSE), hasArgNumbers(FALSE), needsAutoQuoting(FALSE) {
   165     if(init(errorCode)) {
   166         parse(pattern, parseError, errorCode);
   167     }
   168 }
   170 UBool
   171 MessagePattern::init(UErrorCode &errorCode) {
   172     if(U_FAILURE(errorCode)) {
   173         return FALSE;
   174     }
   175     partsList=new MessagePatternPartsList();
   176     if(partsList==NULL) {
   177         errorCode=U_MEMORY_ALLOCATION_ERROR;
   178         return FALSE;
   179     }
   180     parts=partsList->a.getAlias();
   181     return TRUE;
   182 }
   184 MessagePattern::MessagePattern(const MessagePattern &other)
   185         : UObject(other), aposMode(other.aposMode), msg(other.msg),
   186           partsList(NULL), parts(NULL), partsLength(0),
   187           numericValuesList(NULL), numericValues(NULL), numericValuesLength(0),
   188           hasArgNames(other.hasArgNames), hasArgNumbers(other.hasArgNumbers),
   189           needsAutoQuoting(other.needsAutoQuoting) {
   190     UErrorCode errorCode=U_ZERO_ERROR;
   191     if(!copyStorage(other, errorCode)) {
   192         clear();
   193     }
   194 }
   196 MessagePattern &
   197 MessagePattern::operator=(const MessagePattern &other) {
   198     if(this==&other) {
   199         return *this;
   200     }
   201     aposMode=other.aposMode;
   202     msg=other.msg;
   203     hasArgNames=other.hasArgNames;
   204     hasArgNumbers=other.hasArgNumbers;
   205     needsAutoQuoting=other.needsAutoQuoting;
   206     UErrorCode errorCode=U_ZERO_ERROR;
   207     if(!copyStorage(other, errorCode)) {
   208         clear();
   209     }
   210     return *this;
   211 }
   213 UBool
   214 MessagePattern::copyStorage(const MessagePattern &other, UErrorCode &errorCode) {
   215     if(U_FAILURE(errorCode)) {
   216         return FALSE;
   217     }
   218     parts=NULL;
   219     partsLength=0;
   220     numericValues=NULL;
   221     numericValuesLength=0;
   222     if(partsList==NULL) {
   223         partsList=new MessagePatternPartsList();
   224         if(partsList==NULL) {
   225             errorCode=U_MEMORY_ALLOCATION_ERROR;
   226             return FALSE;
   227         }
   228         parts=partsList->a.getAlias();
   229     }
   230     if(other.partsLength>0) {
   231         partsList->copyFrom(*other.partsList, other.partsLength, errorCode);
   232         if(U_FAILURE(errorCode)) {
   233             return FALSE;
   234         }
   235         parts=partsList->a.getAlias();
   236         partsLength=other.partsLength;
   237     }
   238     if(other.numericValuesLength>0) {
   239         if(numericValuesList==NULL) {
   240             numericValuesList=new MessagePatternDoubleList();
   241             if(numericValuesList==NULL) {
   242                 errorCode=U_MEMORY_ALLOCATION_ERROR;
   243                 return FALSE;
   244             }
   245             numericValues=numericValuesList->a.getAlias();
   246         }
   247         numericValuesList->copyFrom(
   248             *other.numericValuesList, other.numericValuesLength, errorCode);
   249         if(U_FAILURE(errorCode)) {
   250             return FALSE;
   251         }
   252         numericValues=numericValuesList->a.getAlias();
   253         numericValuesLength=other.numericValuesLength;
   254     }
   255     return TRUE;
   256 }
   258 MessagePattern::~MessagePattern() {
   259     delete partsList;
   260     delete numericValuesList;
   261 }
   263 // MessagePattern API ------------------------------------------------------ ***
   265 MessagePattern &
   266 MessagePattern::parse(const UnicodeString &pattern, UParseError *parseError, UErrorCode &errorCode) {
   267     preParse(pattern, parseError, errorCode);
   268     parseMessage(0, 0, 0, UMSGPAT_ARG_TYPE_NONE, parseError, errorCode);
   269     postParse();
   270     return *this;
   271 }
   273 MessagePattern &
   274 MessagePattern::parseChoiceStyle(const UnicodeString &pattern,
   275                                  UParseError *parseError, UErrorCode &errorCode) {
   276     preParse(pattern, parseError, errorCode);
   277     parseChoiceStyle(0, 0, parseError, errorCode);
   278     postParse();
   279     return *this;
   280 }
   282 MessagePattern &
   283 MessagePattern::parsePluralStyle(const UnicodeString &pattern,
   284                                  UParseError *parseError, UErrorCode &errorCode) {
   285     preParse(pattern, parseError, errorCode);
   286     parsePluralOrSelectStyle(UMSGPAT_ARG_TYPE_PLURAL, 0, 0, parseError, errorCode);
   287     postParse();
   288     return *this;
   289 }
   291 MessagePattern &
   292 MessagePattern::parseSelectStyle(const UnicodeString &pattern,
   293                                  UParseError *parseError, UErrorCode &errorCode) {
   294     preParse(pattern, parseError, errorCode);
   295     parsePluralOrSelectStyle(UMSGPAT_ARG_TYPE_SELECT, 0, 0, parseError, errorCode);
   296     postParse();
   297     return *this;
   298 }
   300 void
   301 MessagePattern::clear() {
   302     // Mostly the same as preParse().
   303     msg.remove();
   304     hasArgNames=hasArgNumbers=FALSE;
   305     needsAutoQuoting=FALSE;
   306     partsLength=0;
   307     numericValuesLength=0;
   308 }
   310 UBool
   311 MessagePattern::operator==(const MessagePattern &other) const {
   312     if(this==&other) {
   313         return TRUE;
   314     }
   315     return
   316         aposMode==other.aposMode &&
   317         msg==other.msg &&
   318         // parts.equals(o.parts)
   319         partsLength==other.partsLength &&
   320         (partsLength==0 || partsList->equals(*other.partsList, partsLength));
   321     // No need to compare numericValues if msg and parts are the same.
   322 }
   324 int32_t
   325 MessagePattern::hashCode() const {
   326     int32_t hash=(aposMode*37+msg.hashCode())*37+partsLength;
   327     for(int32_t i=0; i<partsLength; ++i) {
   328         hash=hash*37+parts[i].hashCode();
   329     }
   330     return hash;
   331 }
   333 int32_t
   334 MessagePattern::validateArgumentName(const UnicodeString &name) {
   335     if(!PatternProps::isIdentifier(name.getBuffer(), name.length())) {
   336         return UMSGPAT_ARG_NAME_NOT_VALID;
   337     }
   338     return parseArgNumber(name, 0, name.length());
   339 }
   341 UnicodeString
   342 MessagePattern::autoQuoteApostropheDeep() const {
   343     if(!needsAutoQuoting) {
   344         return msg;
   345     }
   346     UnicodeString modified(msg);
   347     // Iterate backward so that the insertion indexes do not change.
   348     int32_t count=countParts();
   349     for(int32_t i=count; i>0;) {
   350         const Part &part=getPart(--i);
   351         if(part.getType()==UMSGPAT_PART_TYPE_INSERT_CHAR) {
   352            modified.insert(part.index, (UChar)part.value);
   353         }
   354     }
   355     return modified;
   356 }
   358 double
   359 MessagePattern::getNumericValue(const Part &part) const {
   360     UMessagePatternPartType type=part.type;
   361     if(type==UMSGPAT_PART_TYPE_ARG_INT) {
   362         return part.value;
   363     } else if(type==UMSGPAT_PART_TYPE_ARG_DOUBLE) {
   364         return numericValues[part.value];
   365     } else {
   366         return UMSGPAT_NO_NUMERIC_VALUE;
   367     }
   368 }
   370 /**
   371   * Returns the "offset:" value of a PluralFormat argument, or 0 if none is specified.
   372   * @param pluralStart the index of the first PluralFormat argument style part. (0..countParts()-1)
   373   * @return the "offset:" value.
   374   * @draft ICU 4.8
   375   */
   376 double
   377 MessagePattern::getPluralOffset(int32_t pluralStart) const {
   378     const Part &part=getPart(pluralStart);
   379     if(Part::hasNumericValue(part.type)) {
   380         return getNumericValue(part);
   381     } else {
   382         return 0;
   383     }
   384 }
   386 // MessagePattern::Part ---------------------------------------------------- ***
   388 UBool
   389 MessagePattern::Part::operator==(const Part &other) const {
   390     if(this==&other) {
   391         return TRUE;
   392     }
   393     return
   394         type==other.type &&
   395         index==other.index &&
   396         length==other.length &&
   397         value==other.value &&
   398         limitPartIndex==other.limitPartIndex;
   399 }
   401 // MessagePattern parser --------------------------------------------------- ***
   403 void
   404 MessagePattern::preParse(const UnicodeString &pattern, UParseError *parseError, UErrorCode &errorCode) {
   405     if(U_FAILURE(errorCode)) {
   406         return;
   407     }
   408     if(parseError!=NULL) {
   409         parseError->line=0;
   410         parseError->offset=0;
   411         parseError->preContext[0]=0;
   412         parseError->postContext[0]=0;
   413     }
   414     msg=pattern;
   415     hasArgNames=hasArgNumbers=FALSE;
   416     needsAutoQuoting=FALSE;
   417     partsLength=0;
   418     numericValuesLength=0;
   419 }
   421 void
   422 MessagePattern::postParse() {
   423     if(partsList!=NULL) {
   424         parts=partsList->a.getAlias();
   425     }
   426     if(numericValuesList!=NULL) {
   427         numericValues=numericValuesList->a.getAlias();
   428     }
   429 }
   431 int32_t
   432 MessagePattern::parseMessage(int32_t index, int32_t msgStartLength,
   433                              int32_t nestingLevel, UMessagePatternArgType parentType,
   434                              UParseError *parseError, UErrorCode &errorCode) {
   435     if(U_FAILURE(errorCode)) {
   436         return 0;
   437     }
   438     if(nestingLevel>Part::MAX_VALUE) {
   439         errorCode=U_INDEX_OUTOFBOUNDS_ERROR;
   440         return 0;
   441     }
   442     int32_t msgStart=partsLength;
   443     addPart(UMSGPAT_PART_TYPE_MSG_START, index, msgStartLength, nestingLevel, errorCode);
   444     index+=msgStartLength;
   445     for(;;) {  // while(index<msg.length()) with U_FAILURE(errorCode) check
   446         if(U_FAILURE(errorCode)) {
   447             return 0;
   448         }
   449         if(index>=msg.length()) {
   450             break;
   451         }
   452         UChar c=msg.charAt(index++);
   453         if(c==u_apos) {
   454             if(index==msg.length()) {
   455                 // The apostrophe is the last character in the pattern. 
   456                 // Add a Part for auto-quoting.
   457                 addPart(UMSGPAT_PART_TYPE_INSERT_CHAR, index, 0,
   458                         u_apos, errorCode);  // value=char to be inserted
   459                 needsAutoQuoting=TRUE;
   460             } else {
   461                 c=msg.charAt(index);
   462                 if(c==u_apos) {
   463                     // double apostrophe, skip the second one
   464                     addPart(UMSGPAT_PART_TYPE_SKIP_SYNTAX, index++, 1, 0, errorCode);
   465                 } else if(
   466                     aposMode==UMSGPAT_APOS_DOUBLE_REQUIRED ||
   467                     c==u_leftCurlyBrace || c==u_rightCurlyBrace ||
   468                     (parentType==UMSGPAT_ARG_TYPE_CHOICE && c==u_pipe) ||
   469                     (UMSGPAT_ARG_TYPE_HAS_PLURAL_STYLE(parentType) && c==u_pound)
   470                 ) {
   471                     // skip the quote-starting apostrophe
   472                     addPart(UMSGPAT_PART_TYPE_SKIP_SYNTAX, index-1, 1, 0, errorCode);
   473                     // find the end of the quoted literal text
   474                     for(;;) {
   475                         index=msg.indexOf(u_apos, index+1);
   476                         if(index>=0) {
   477                             if(/*(index+1)<msg.length() &&*/ msg.charAt(index+1)==u_apos) {
   478                                 // double apostrophe inside quoted literal text
   479                                 // still encodes a single apostrophe, skip the second one
   480                                 addPart(UMSGPAT_PART_TYPE_SKIP_SYNTAX, ++index, 1, 0, errorCode);
   481                             } else {
   482                                 // skip the quote-ending apostrophe
   483                                 addPart(UMSGPAT_PART_TYPE_SKIP_SYNTAX, index++, 1, 0, errorCode);
   484                                 break;
   485                             }
   486                         } else {
   487                             // The quoted text reaches to the end of the of the message.
   488                             index=msg.length();
   489                             // Add a Part for auto-quoting.
   490                             addPart(UMSGPAT_PART_TYPE_INSERT_CHAR, index, 0,
   491                                     u_apos, errorCode);  // value=char to be inserted
   492                             needsAutoQuoting=TRUE;
   493                             break;
   494                         }
   495                     }
   496                 } else {
   497                     // Interpret the apostrophe as literal text.
   498                     // Add a Part for auto-quoting.
   499                     addPart(UMSGPAT_PART_TYPE_INSERT_CHAR, index, 0,
   500                             u_apos, errorCode);  // value=char to be inserted
   501                     needsAutoQuoting=TRUE;
   502                 }
   503             }
   504         } else if(UMSGPAT_ARG_TYPE_HAS_PLURAL_STYLE(parentType) && c==u_pound) {
   505             // The unquoted # in a plural message fragment will be replaced
   506             // with the (number-offset).
   507             addPart(UMSGPAT_PART_TYPE_REPLACE_NUMBER, index-1, 1, 0, errorCode);
   508         } else if(c==u_leftCurlyBrace) {
   509             index=parseArg(index-1, 1, nestingLevel, parseError, errorCode);
   510         } else if((nestingLevel>0 && c==u_rightCurlyBrace) ||
   511                   (parentType==UMSGPAT_ARG_TYPE_CHOICE && c==u_pipe)) {
   512             // Finish the message before the terminator.
   513             // In a choice style, report the "}" substring only for the following ARG_LIMIT,
   514             // not for this MSG_LIMIT.
   515             int32_t limitLength=(parentType==UMSGPAT_ARG_TYPE_CHOICE && c==u_rightCurlyBrace) ? 0 : 1;
   516             addLimitPart(msgStart, UMSGPAT_PART_TYPE_MSG_LIMIT, index-1, limitLength,
   517                          nestingLevel, errorCode);
   518             if(parentType==UMSGPAT_ARG_TYPE_CHOICE) {
   519                 // Let the choice style parser see the '}' or '|'.
   520                 return index-1;
   521             } else {
   522                 // continue parsing after the '}'
   523                 return index;
   524             }
   525         }  // else: c is part of literal text
   526     }
   527     if(nestingLevel>0 && !inTopLevelChoiceMessage(nestingLevel, parentType)) {
   528         setParseError(parseError, 0);  // Unmatched '{' braces in message.
   529         errorCode=U_UNMATCHED_BRACES;
   530         return 0;
   531     }
   532     addLimitPart(msgStart, UMSGPAT_PART_TYPE_MSG_LIMIT, index, 0, nestingLevel, errorCode);
   533     return index;
   534 }
   536 int32_t
   537 MessagePattern::parseArg(int32_t index, int32_t argStartLength, int32_t nestingLevel,
   538                          UParseError *parseError, UErrorCode &errorCode) {
   539     int32_t argStart=partsLength;
   540     UMessagePatternArgType argType=UMSGPAT_ARG_TYPE_NONE;
   541     addPart(UMSGPAT_PART_TYPE_ARG_START, index, argStartLength, argType, errorCode);
   542     if(U_FAILURE(errorCode)) {
   543         return 0;
   544     }
   545     int32_t nameIndex=index=skipWhiteSpace(index+argStartLength);
   546     if(index==msg.length()) {
   547         setParseError(parseError, 0);  // Unmatched '{' braces in message.
   548         errorCode=U_UNMATCHED_BRACES;
   549         return 0;
   550     }
   551     // parse argument name or number
   552     index=skipIdentifier(index);
   553     int32_t number=parseArgNumber(nameIndex, index);
   554     if(number>=0) {
   555         int32_t length=index-nameIndex;
   556         if(length>Part::MAX_LENGTH || number>Part::MAX_VALUE) {
   557             setParseError(parseError, nameIndex);  // Argument number too large.
   558             errorCode=U_INDEX_OUTOFBOUNDS_ERROR;
   559             return 0;
   560         }
   561         hasArgNumbers=TRUE;
   562         addPart(UMSGPAT_PART_TYPE_ARG_NUMBER, nameIndex, length, number, errorCode);
   563     } else if(number==UMSGPAT_ARG_NAME_NOT_NUMBER) {
   564         int32_t length=index-nameIndex;
   565         if(length>Part::MAX_LENGTH) {
   566             setParseError(parseError, nameIndex);  // Argument name too long.
   567             errorCode=U_INDEX_OUTOFBOUNDS_ERROR;
   568             return 0;
   569         }
   570         hasArgNames=TRUE;
   571         addPart(UMSGPAT_PART_TYPE_ARG_NAME, nameIndex, length, 0, errorCode);
   572     } else {  // number<-1 (ARG_NAME_NOT_VALID)
   573         setParseError(parseError, nameIndex);  // Bad argument syntax.
   574         errorCode=U_PATTERN_SYNTAX_ERROR;
   575         return 0;
   576     }
   577     index=skipWhiteSpace(index);
   578     if(index==msg.length()) {
   579         setParseError(parseError, 0);  // Unmatched '{' braces in message.
   580         errorCode=U_UNMATCHED_BRACES;
   581         return 0;
   582     }
   583     UChar c=msg.charAt(index);
   584     if(c==u_rightCurlyBrace) {
   585         // all done
   586     } else if(c!=u_comma) {
   587         setParseError(parseError, nameIndex);  // Bad argument syntax.
   588         errorCode=U_PATTERN_SYNTAX_ERROR;
   589         return 0;
   590     } else /* ',' */ {
   591         // parse argument type: case-sensitive a-zA-Z
   592         int32_t typeIndex=index=skipWhiteSpace(index+1);
   593         while(index<msg.length() && isArgTypeChar(msg.charAt(index))) {
   594             ++index;
   595         }
   596         int32_t length=index-typeIndex;
   597         index=skipWhiteSpace(index);
   598         if(index==msg.length()) {
   599             setParseError(parseError, 0);  // Unmatched '{' braces in message.
   600             errorCode=U_UNMATCHED_BRACES;
   601             return 0;
   602         }
   603         if(length==0 || ((c=msg.charAt(index))!=u_comma && c!=u_rightCurlyBrace)) {
   604             setParseError(parseError, nameIndex);  // Bad argument syntax.
   605             errorCode=U_PATTERN_SYNTAX_ERROR;
   606             return 0;
   607         }
   608         if(length>Part::MAX_LENGTH) {
   609             setParseError(parseError, nameIndex);  // Argument type name too long.
   610             errorCode=U_INDEX_OUTOFBOUNDS_ERROR;
   611             return 0;
   612         }
   613         argType=UMSGPAT_ARG_TYPE_SIMPLE;
   614         if(length==6) {
   615             // case-insensitive comparisons for complex-type names
   616             if(isChoice(typeIndex)) {
   617                 argType=UMSGPAT_ARG_TYPE_CHOICE;
   618             } else if(isPlural(typeIndex)) {
   619                 argType=UMSGPAT_ARG_TYPE_PLURAL;
   620             } else if(isSelect(typeIndex)) {
   621                 argType=UMSGPAT_ARG_TYPE_SELECT;
   622             }
   623         } else if(length==13) {
   624             if(isSelect(typeIndex) && isOrdinal(typeIndex+6)) {
   625                 argType=UMSGPAT_ARG_TYPE_SELECTORDINAL;
   626             }
   627         }
   628         // change the ARG_START type from NONE to argType
   629         partsList->a[argStart].value=(int16_t)argType;
   630         if(argType==UMSGPAT_ARG_TYPE_SIMPLE) {
   631             addPart(UMSGPAT_PART_TYPE_ARG_TYPE, typeIndex, length, 0, errorCode);
   632         }
   633         // look for an argument style (pattern)
   634         if(c==u_rightCurlyBrace) {
   635             if(argType!=UMSGPAT_ARG_TYPE_SIMPLE) {
   636                 setParseError(parseError, nameIndex);  // No style field for complex argument.
   637                 errorCode=U_PATTERN_SYNTAX_ERROR;
   638                 return 0;
   639             }
   640         } else /* ',' */ {
   641             ++index;
   642             if(argType==UMSGPAT_ARG_TYPE_SIMPLE) {
   643                 index=parseSimpleStyle(index, parseError, errorCode);
   644             } else if(argType==UMSGPAT_ARG_TYPE_CHOICE) {
   645                 index=parseChoiceStyle(index, nestingLevel, parseError, errorCode);
   646             } else {
   647                 index=parsePluralOrSelectStyle(argType, index, nestingLevel, parseError, errorCode);
   648             }
   649         }
   650     }
   651     // Argument parsing stopped on the '}'.
   652     addLimitPart(argStart, UMSGPAT_PART_TYPE_ARG_LIMIT, index, 1, argType, errorCode);
   653     return index+1;
   654 }
   656 int32_t
   657 MessagePattern::parseSimpleStyle(int32_t index, UParseError *parseError, UErrorCode &errorCode) {
   658     if(U_FAILURE(errorCode)) {
   659         return 0;
   660     }
   661     int32_t start=index;
   662     int32_t nestedBraces=0;
   663     while(index<msg.length()) {
   664         UChar c=msg.charAt(index++);
   665         if(c==u_apos) {
   666             // Treat apostrophe as quoting but include it in the style part.
   667             // Find the end of the quoted literal text.
   668             index=msg.indexOf(u_apos, index);
   669             if(index<0) {
   670                 // Quoted literal argument style text reaches to the end of the message.
   671                 setParseError(parseError, start);
   672                 errorCode=U_PATTERN_SYNTAX_ERROR;
   673                 return 0;
   674             }
   675             // skip the quote-ending apostrophe
   676             ++index;
   677         } else if(c==u_leftCurlyBrace) {
   678             ++nestedBraces;
   679         } else if(c==u_rightCurlyBrace) {
   680             if(nestedBraces>0) {
   681                 --nestedBraces;
   682             } else {
   683                 int32_t length=--index-start;
   684                 if(length>Part::MAX_LENGTH) {
   685                     setParseError(parseError, start);  // Argument style text too long.
   686                     errorCode=U_INDEX_OUTOFBOUNDS_ERROR;
   687                     return 0;
   688                 }
   689                 addPart(UMSGPAT_PART_TYPE_ARG_STYLE, start, length, 0, errorCode);
   690                 return index;
   691             }
   692         }  // c is part of literal text
   693     }
   694     setParseError(parseError, 0);  // Unmatched '{' braces in message.
   695     errorCode=U_UNMATCHED_BRACES;
   696     return 0;
   697 }
   699 int32_t
   700 MessagePattern::parseChoiceStyle(int32_t index, int32_t nestingLevel,
   701                                  UParseError *parseError, UErrorCode &errorCode) {
   702     if(U_FAILURE(errorCode)) {
   703         return 0;
   704     }
   705     int32_t start=index;
   706     index=skipWhiteSpace(index);
   707     if(index==msg.length() || msg.charAt(index)==u_rightCurlyBrace) {
   708         setParseError(parseError, 0);  // Missing choice argument pattern.
   709         errorCode=U_PATTERN_SYNTAX_ERROR;
   710         return 0;
   711     }
   712     for(;;) {
   713         // The choice argument style contains |-separated (number, separator, message) triples.
   714         // Parse the number.
   715         int32_t numberIndex=index;
   716         index=skipDouble(index);
   717         int32_t length=index-numberIndex;
   718         if(length==0) {
   719             setParseError(parseError, start);  // Bad choice pattern syntax.
   720             errorCode=U_PATTERN_SYNTAX_ERROR;
   721             return 0;
   722         }
   723         if(length>Part::MAX_LENGTH) {
   724             setParseError(parseError, numberIndex);  // Choice number too long.
   725             errorCode=U_INDEX_OUTOFBOUNDS_ERROR;
   726             return 0;
   727         }
   728         parseDouble(numberIndex, index, TRUE, parseError, errorCode);  // adds ARG_INT or ARG_DOUBLE
   729         if(U_FAILURE(errorCode)) {
   730             return 0;
   731         }
   732         // Parse the separator.
   733         index=skipWhiteSpace(index);
   734         if(index==msg.length()) {
   735             setParseError(parseError, start);  // Bad choice pattern syntax.
   736             errorCode=U_PATTERN_SYNTAX_ERROR;
   737             return 0;
   738         }
   739         UChar c=msg.charAt(index);
   740         if(!(c==u_pound || c==u_lessThan || c==u_lessOrEqual)) {  // U+2264 is <=
   741             setParseError(parseError, start);  // Expected choice separator (#<\u2264) instead of c.
   742             errorCode=U_PATTERN_SYNTAX_ERROR;
   743             return 0;
   744         }
   745         addPart(UMSGPAT_PART_TYPE_ARG_SELECTOR, index, 1, 0, errorCode);
   746         // Parse the message fragment.
   747         index=parseMessage(++index, 0, nestingLevel+1, UMSGPAT_ARG_TYPE_CHOICE, parseError, errorCode);
   748         if(U_FAILURE(errorCode)) {
   749             return 0;
   750         }
   751         // parseMessage(..., CHOICE) returns the index of the terminator, or msg.length().
   752         if(index==msg.length()) {
   753             return index;
   754         }
   755         if(msg.charAt(index)==u_rightCurlyBrace) {
   756             if(!inMessageFormatPattern(nestingLevel)) {
   757                 setParseError(parseError, start);  // Bad choice pattern syntax.
   758                 errorCode=U_PATTERN_SYNTAX_ERROR;
   759                 return 0;
   760             }
   761             return index;
   762         }  // else the terminator is '|'
   763         index=skipWhiteSpace(index+1);
   764     }
   765 }
   767 int32_t
   768 MessagePattern::parsePluralOrSelectStyle(UMessagePatternArgType argType,
   769                                          int32_t index, int32_t nestingLevel,
   770                                          UParseError *parseError, UErrorCode &errorCode) {
   771     if(U_FAILURE(errorCode)) {
   772         return 0;
   773     }
   774     int32_t start=index;
   775     UBool isEmpty=TRUE;
   776     UBool hasOther=FALSE;
   777     for(;;) {
   778         // First, collect the selector looking for a small set of terminators.
   779         // It would be a little faster to consider the syntax of each possible
   780         // token right here, but that makes the code too complicated.
   781         index=skipWhiteSpace(index);
   782         UBool eos=index==msg.length();
   783         if(eos || msg.charAt(index)==u_rightCurlyBrace) {
   784             if(eos==inMessageFormatPattern(nestingLevel)) {
   785                 setParseError(parseError, start);  // Bad plural/select pattern syntax.
   786                 errorCode=U_PATTERN_SYNTAX_ERROR;
   787                 return 0;
   788             }
   789             if(!hasOther) {
   790                 setParseError(parseError, 0);  // Missing 'other' keyword in plural/select pattern.
   791                 errorCode=U_DEFAULT_KEYWORD_MISSING;
   792                 return 0;
   793             }
   794             return index;
   795         }
   796         int32_t selectorIndex=index;
   797         if(UMSGPAT_ARG_TYPE_HAS_PLURAL_STYLE(argType) && msg.charAt(selectorIndex)==u_equal) {
   798             // explicit-value plural selector: =double
   799             index=skipDouble(index+1);
   800             int32_t length=index-selectorIndex;
   801             if(length==1) {
   802                 setParseError(parseError, start);  // Bad plural/select pattern syntax.
   803                 errorCode=U_PATTERN_SYNTAX_ERROR;
   804                 return 0;
   805             }
   806             if(length>Part::MAX_LENGTH) {
   807                 setParseError(parseError, selectorIndex);  // Argument selector too long.
   808                 errorCode=U_INDEX_OUTOFBOUNDS_ERROR;
   809                 return 0;
   810             }
   811             addPart(UMSGPAT_PART_TYPE_ARG_SELECTOR, selectorIndex, length, 0, errorCode);
   812             parseDouble(selectorIndex+1, index, FALSE,
   813                         parseError, errorCode);  // adds ARG_INT or ARG_DOUBLE
   814         } else {
   815             index=skipIdentifier(index);
   816             int32_t length=index-selectorIndex;
   817             if(length==0) {
   818                 setParseError(parseError, start);  // Bad plural/select pattern syntax.
   819                 errorCode=U_PATTERN_SYNTAX_ERROR;
   820                 return 0;
   821             }
   822             // Note: The ':' in "offset:" is just beyond the skipIdentifier() range.
   823             if( UMSGPAT_ARG_TYPE_HAS_PLURAL_STYLE(argType) && length==6 && index<msg.length() &&
   824                 0==msg.compare(selectorIndex, 7, kOffsetColon, 0, 7)
   825             ) {
   826                 // plural offset, not a selector
   827                 if(!isEmpty) {
   828                     // Plural argument 'offset:' (if present) must precede key-message pairs.
   829                     setParseError(parseError, start);
   830                     errorCode=U_PATTERN_SYNTAX_ERROR;
   831                     return 0;
   832                 }
   833                 // allow whitespace between offset: and its value
   834                 int32_t valueIndex=skipWhiteSpace(index+1);  // The ':' is at index.
   835                 index=skipDouble(valueIndex);
   836                 if(index==valueIndex) {
   837                     setParseError(parseError, start);  // Missing value for plural 'offset:'.
   838                     errorCode=U_PATTERN_SYNTAX_ERROR;
   839                     return 0;
   840                 }
   841                 if((index-valueIndex)>Part::MAX_LENGTH) {
   842                     setParseError(parseError, valueIndex);  // Plural offset value too long.
   843                     errorCode=U_INDEX_OUTOFBOUNDS_ERROR;
   844                     return 0;
   845                 }
   846                 parseDouble(valueIndex, index, FALSE,
   847                             parseError, errorCode);  // adds ARG_INT or ARG_DOUBLE
   848                 if(U_FAILURE(errorCode)) {
   849                     return 0;
   850                 }
   851                 isEmpty=FALSE;
   852                 continue;  // no message fragment after the offset
   853             } else {
   854                 // normal selector word
   855                 if(length>Part::MAX_LENGTH) {
   856                     setParseError(parseError, selectorIndex);  // Argument selector too long.
   857                     errorCode=U_INDEX_OUTOFBOUNDS_ERROR;
   858                     return 0;
   859                 }
   860                 addPart(UMSGPAT_PART_TYPE_ARG_SELECTOR, selectorIndex, length, 0, errorCode);
   861                 if(0==msg.compare(selectorIndex, length, kOther, 0, 5)) {
   862                     hasOther=TRUE;
   863                 }
   864             }
   865         }
   866         if(U_FAILURE(errorCode)) {
   867             return 0;
   868         }
   870         // parse the message fragment following the selector
   871         index=skipWhiteSpace(index);
   872         if(index==msg.length() || msg.charAt(index)!=u_leftCurlyBrace) {
   873             setParseError(parseError, selectorIndex);  // No message fragment after plural/select selector.
   874             errorCode=U_PATTERN_SYNTAX_ERROR;
   875             return 0;
   876         }
   877         index=parseMessage(index, 1, nestingLevel+1, argType, parseError, errorCode);
   878         if(U_FAILURE(errorCode)) {
   879             return 0;
   880         }
   881         isEmpty=FALSE;
   882     }
   883 }
   885 int32_t
   886 MessagePattern::parseArgNumber(const UnicodeString &s, int32_t start, int32_t limit) {
   887     // If the identifier contains only ASCII digits, then it is an argument _number_
   888     // and must not have leading zeros (except "0" itself).
   889     // Otherwise it is an argument _name_.
   890     if(start>=limit) {
   891         return UMSGPAT_ARG_NAME_NOT_VALID;
   892     }
   893     int32_t number;
   894     // Defer numeric errors until we know there are only digits.
   895     UBool badNumber;
   896     UChar c=s.charAt(start++);
   897     if(c==0x30) {
   898         if(start==limit) {
   899             return 0;
   900         } else {
   901             number=0;
   902             badNumber=TRUE;  // leading zero
   903         }
   904     } else if(0x31<=c && c<=0x39) {
   905         number=c-0x30;
   906         badNumber=FALSE;
   907     } else {
   908         return UMSGPAT_ARG_NAME_NOT_NUMBER;
   909     }
   910     while(start<limit) {
   911         c=s.charAt(start++);
   912         if(0x30<=c && c<=0x39) {
   913             if(number>=INT32_MAX/10) {
   914                 badNumber=TRUE;  // overflow
   915             }
   916             number=number*10+(c-0x30);
   917         } else {
   918             return UMSGPAT_ARG_NAME_NOT_NUMBER;
   919         }
   920     }
   921     // There are only ASCII digits.
   922     if(badNumber) {
   923         return UMSGPAT_ARG_NAME_NOT_VALID;
   924     } else {
   925         return number;
   926     }
   927 }
   929 void
   930 MessagePattern::parseDouble(int32_t start, int32_t limit, UBool allowInfinity,
   931                             UParseError *parseError, UErrorCode &errorCode) {
   932     if(U_FAILURE(errorCode)) {
   933         return;
   934     }
   935     U_ASSERT(start<limit);
   936     // fake loop for easy exit and single throw statement
   937     for(;;) { /*loop doesn't iterate*/
   938         // fast path for small integers and infinity
   939         int32_t value=0;
   940         int32_t isNegative=0;  // not boolean so that we can easily add it to value
   941         int32_t index=start;
   942         UChar c=msg.charAt(index++);
   943         if(c==u_minus) {
   944             isNegative=1;
   945             if(index==limit) {
   946                 break;  // no number
   947             }
   948             c=msg.charAt(index++);
   949         } else if(c==u_plus) {
   950             if(index==limit) {
   951                 break;  // no number
   952             }
   953             c=msg.charAt(index++);
   954         }
   955         if(c==0x221e) {  // infinity
   956             if(allowInfinity && index==limit) {
   957                 double infinity=uprv_getInfinity();
   958                 addArgDoublePart(
   959                     isNegative!=0 ? -infinity : infinity,
   960                     start, limit-start, errorCode);
   961                 return;
   962             } else {
   963                 break;
   964             }
   965         }
   966         // try to parse the number as a small integer but fall back to a double
   967         while('0'<=c && c<='9') {
   968             value=value*10+(c-'0');
   969             if(value>(Part::MAX_VALUE+isNegative)) {
   970                 break;  // not a small-enough integer
   971             }
   972             if(index==limit) {
   973                 addPart(UMSGPAT_PART_TYPE_ARG_INT, start, limit-start,
   974                         isNegative!=0 ? -value : value, errorCode);
   975                 return;
   976             }
   977             c=msg.charAt(index++);
   978         }
   979         // Let Double.parseDouble() throw a NumberFormatException.
   980         char numberChars[128];
   981         int32_t capacity=(int32_t)sizeof(numberChars);
   982         int32_t length=limit-start;
   983         if(length>=capacity) {
   984             break;  // number too long
   985         }
   986         msg.extract(start, length, numberChars, capacity, US_INV);
   987         if((int32_t)uprv_strlen(numberChars)<length) {
   988             break;  // contains non-invariant character that was turned into NUL
   989         }
   990         char *end;
   991         double numericValue=uprv_strtod(numberChars, &end);
   992         if(end!=(numberChars+length)) {
   993             break;  // parsing error
   994         }
   995         addArgDoublePart(numericValue, start, length, errorCode);
   996         return;
   997     }
   998     setParseError(parseError, start /*, limit*/);  // Bad syntax for numeric value.
   999     errorCode=U_PATTERN_SYNTAX_ERROR;
  1000     return;
  1003 int32_t
  1004 MessagePattern::skipWhiteSpace(int32_t index) {
  1005     const UChar *s=msg.getBuffer();
  1006     int32_t msgLength=msg.length();
  1007     const UChar *t=PatternProps::skipWhiteSpace(s+index, msgLength-index);
  1008     return (int32_t)(t-s);
  1011 int32_t
  1012 MessagePattern::skipIdentifier(int32_t index) {
  1013     const UChar *s=msg.getBuffer();
  1014     int32_t msgLength=msg.length();
  1015     const UChar *t=PatternProps::skipIdentifier(s+index, msgLength-index);
  1016     return (int32_t)(t-s);
  1019 int32_t
  1020 MessagePattern::skipDouble(int32_t index) {
  1021     int32_t msgLength=msg.length();
  1022     while(index<msgLength) {
  1023         UChar c=msg.charAt(index);
  1024         // U+221E: Allow the infinity symbol, for ChoiceFormat patterns.
  1025         if((c<0x30 && c!=u_plus && c!=u_minus && c!=u_dot) || (c>0x39 && c!=u_e && c!=u_E && c!=0x221e)) {
  1026             break;
  1028         ++index;
  1030     return index;
  1033 UBool
  1034 MessagePattern::isArgTypeChar(UChar32 c) {
  1035     return (u_a<=c && c<=u_z) || (u_A<=c && c<=u_Z);
  1038 UBool
  1039 MessagePattern::isChoice(int32_t index) {
  1040     UChar c;
  1041     return
  1042         ((c=msg.charAt(index++))==u_c || c==u_C) &&
  1043         ((c=msg.charAt(index++))==u_h || c==u_H) &&
  1044         ((c=msg.charAt(index++))==u_o || c==u_O) &&
  1045         ((c=msg.charAt(index++))==u_i || c==u_I) &&
  1046         ((c=msg.charAt(index++))==u_c || c==u_C) &&
  1047         ((c=msg.charAt(index))==u_e || c==u_E);
  1050 UBool
  1051 MessagePattern::isPlural(int32_t index) {
  1052     UChar c;
  1053     return
  1054         ((c=msg.charAt(index++))==u_p || c==u_P) &&
  1055         ((c=msg.charAt(index++))==u_l || c==u_L) &&
  1056         ((c=msg.charAt(index++))==u_u || c==u_U) &&
  1057         ((c=msg.charAt(index++))==u_r || c==u_R) &&
  1058         ((c=msg.charAt(index++))==u_a || c==u_A) &&
  1059         ((c=msg.charAt(index))==u_l || c==u_L);
  1062 UBool
  1063 MessagePattern::isSelect(int32_t index) {
  1064     UChar c;
  1065     return
  1066         ((c=msg.charAt(index++))==u_s || c==u_S) &&
  1067         ((c=msg.charAt(index++))==u_e || c==u_E) &&
  1068         ((c=msg.charAt(index++))==u_l || c==u_L) &&
  1069         ((c=msg.charAt(index++))==u_e || c==u_E) &&
  1070         ((c=msg.charAt(index++))==u_c || c==u_C) &&
  1071         ((c=msg.charAt(index))==u_t || c==u_T);
  1074 UBool
  1075 MessagePattern::isOrdinal(int32_t index) {
  1076     UChar c;
  1077     return
  1078         ((c=msg.charAt(index++))==u_o || c==u_O) &&
  1079         ((c=msg.charAt(index++))==u_r || c==u_R) &&
  1080         ((c=msg.charAt(index++))==u_d || c==u_D) &&
  1081         ((c=msg.charAt(index++))==u_i || c==u_I) &&
  1082         ((c=msg.charAt(index++))==u_n || c==u_N) &&
  1083         ((c=msg.charAt(index++))==u_a || c==u_A) &&
  1084         ((c=msg.charAt(index))==u_l || c==u_L);
  1087 UBool
  1088 MessagePattern::inMessageFormatPattern(int32_t nestingLevel) {
  1089     return nestingLevel>0 || partsList->a[0].type==UMSGPAT_PART_TYPE_MSG_START;
  1092 UBool
  1093 MessagePattern::inTopLevelChoiceMessage(int32_t nestingLevel, UMessagePatternArgType parentType) {
  1094     return
  1095         nestingLevel==1 &&
  1096         parentType==UMSGPAT_ARG_TYPE_CHOICE &&
  1097         partsList->a[0].type!=UMSGPAT_PART_TYPE_MSG_START;
  1100 void
  1101 MessagePattern::addPart(UMessagePatternPartType type, int32_t index, int32_t length,
  1102                         int32_t value, UErrorCode &errorCode) {
  1103     if(partsList->ensureCapacityForOneMore(partsLength, errorCode)) {
  1104         Part &part=partsList->a[partsLength++];
  1105         part.type=type;
  1106         part.index=index;
  1107         part.length=(uint16_t)length;
  1108         part.value=(int16_t)value;
  1109         part.limitPartIndex=0;
  1113 void
  1114 MessagePattern::addLimitPart(int32_t start,
  1115                              UMessagePatternPartType type, int32_t index, int32_t length,
  1116                              int32_t value, UErrorCode &errorCode) {
  1117     partsList->a[start].limitPartIndex=partsLength;
  1118     addPart(type, index, length, value, errorCode);
  1121 void
  1122 MessagePattern::addArgDoublePart(double numericValue, int32_t start, int32_t length,
  1123                                  UErrorCode &errorCode) {
  1124     if(U_FAILURE(errorCode)) {
  1125         return;
  1127     int32_t numericIndex=numericValuesLength;
  1128     if(numericValuesList==NULL) {
  1129         numericValuesList=new MessagePatternDoubleList();
  1130         if(numericValuesList==NULL) {
  1131             errorCode=U_MEMORY_ALLOCATION_ERROR;
  1132             return;
  1134     } else if(!numericValuesList->ensureCapacityForOneMore(numericValuesLength, errorCode)) {
  1135         return;
  1136     } else {
  1137         if(numericIndex>Part::MAX_VALUE) {
  1138             errorCode=U_INDEX_OUTOFBOUNDS_ERROR;
  1139             return;
  1142     numericValuesList->a[numericValuesLength++]=numericValue;
  1143     addPart(UMSGPAT_PART_TYPE_ARG_DOUBLE, start, length, numericIndex, errorCode);
  1146 void
  1147 MessagePattern::setParseError(UParseError *parseError, int32_t index) {
  1148     if(parseError==NULL) {
  1149         return;
  1151     parseError->offset=index;
  1153     // Set preContext to some of msg before index.
  1154     // Avoid splitting a surrogate pair.
  1155     int32_t length=index;
  1156     if(length>=U_PARSE_CONTEXT_LEN) {
  1157         length=U_PARSE_CONTEXT_LEN-1;
  1158         if(length>0 && U16_IS_TRAIL(msg[index-length])) {
  1159             --length;
  1162     msg.extract(index-length, length, parseError->preContext);
  1163     parseError->preContext[length]=0;
  1165     // Set postContext to some of msg starting at index.
  1166     length=msg.length()-index;
  1167     if(length>=U_PARSE_CONTEXT_LEN) {
  1168         length=U_PARSE_CONTEXT_LEN-1;
  1169         if(length>0 && U16_IS_LEAD(msg[index+length-1])) {
  1170             --length;
  1173     msg.extract(index, length, parseError->postContext);
  1174     parseError->postContext[length]=0;
  1177 // MessageImpl ------------------------------------------------------------- ***
  1179 void
  1180 MessageImpl::appendReducedApostrophes(const UnicodeString &s, int32_t start, int32_t limit,
  1181                                       UnicodeString &sb) {
  1182     int32_t doubleApos=-1;
  1183     for(;;) {
  1184         int32_t i=s.indexOf(u_apos, start);
  1185         if(i<0 || i>=limit) {
  1186             sb.append(s, start, limit-start);
  1187             break;
  1189         if(i==doubleApos) {
  1190             // Double apostrophe at start-1 and start==i, append one.
  1191             sb.append(u_apos);
  1192             ++start;
  1193             doubleApos=-1;
  1194         } else {
  1195             // Append text between apostrophes and skip this one.
  1196             sb.append(s, start, i-start);
  1197             doubleApos=start=i+1;
  1202 // Ported from second half of ICU4J SelectFormat.format(String).
  1203 UnicodeString &
  1204 MessageImpl::appendSubMessageWithoutSkipSyntax(const MessagePattern &msgPattern,
  1205                                                int32_t msgStart,
  1206                                                UnicodeString &result) {
  1207     const UnicodeString &msgString=msgPattern.getPatternString();
  1208     int32_t prevIndex=msgPattern.getPart(msgStart).getLimit();
  1209     for(int32_t i=msgStart;;) {
  1210         const MessagePattern::Part &part=msgPattern.getPart(++i);
  1211         UMessagePatternPartType type=part.getType();
  1212         int32_t index=part.getIndex();
  1213         if(type==UMSGPAT_PART_TYPE_MSG_LIMIT) {
  1214             return result.append(msgString, prevIndex, index-prevIndex);
  1215         } else if(type==UMSGPAT_PART_TYPE_SKIP_SYNTAX) {
  1216             result.append(msgString, prevIndex, index-prevIndex);
  1217             prevIndex=part.getLimit();
  1218         } else if(type==UMSGPAT_PART_TYPE_ARG_START) {
  1219             result.append(msgString, prevIndex, index-prevIndex);
  1220             prevIndex=index;
  1221             i=msgPattern.getLimitPartIndex(i);
  1222             index=msgPattern.getPart(i).getLimit();
  1223             appendReducedApostrophes(msgString, prevIndex, index, result);
  1224             prevIndex=index;
  1229 U_NAMESPACE_END
  1231 #endif  // !UCONFIG_NO_FORMATTING

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