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1 // © 2016 and later: Unicode, Inc. and others.
2 // License & terms of use: http://www.unicode.org/copyright.html
3 /*
4 *******************************************************************************
5 *   Copyright (C) 2011-2012, International Business Machines
6 *   Corporation and others.  All Rights Reserved.
7 *******************************************************************************
8 *   file name:  messagepattern.cpp
9 *   encoding:   UTF-8
10 *   tab size:   8 (not used)
11 *   indentation:4
12 *
13 *   created on: 2011mar14
14 *   created by: Markus W. Scherer
15 */
16 
17 #include "unicode/utypes.h"
18 
19 #if !UCONFIG_NO_FORMATTING
20 
21 #include "unicode/messagepattern.h"
22 #include "unicode/unistr.h"
23 #include "unicode/utf16.h"
24 #include "cmemory.h"
25 #include "cstring.h"
26 #include "messageimpl.h"
27 #include "patternprops.h"
28 #include "putilimp.h"
29 #include "uassert.h"
30 
31 U_NAMESPACE_BEGIN
32 
33 // Unicode character/code point constants ---------------------------------- ***
34 
35 static const UChar u_pound=0x23;
36 static const UChar u_apos=0x27;
37 static const UChar u_plus=0x2B;
38 static const UChar u_comma=0x2C;
39 static const UChar u_minus=0x2D;
40 static const UChar u_dot=0x2E;
41 static const UChar u_colon=0x3A;
42 static const UChar u_lessThan=0x3C;
43 static const UChar u_equal=0x3D;
44 static const UChar u_A=0x41;
45 static const UChar u_C=0x43;
46 static const UChar u_D=0x44;
47 static const UChar u_E=0x45;
48 static const UChar u_H=0x48;
49 static const UChar u_I=0x49;
50 static const UChar u_L=0x4C;
51 static const UChar u_N=0x4E;
52 static const UChar u_O=0x4F;
53 static const UChar u_P=0x50;
54 static const UChar u_R=0x52;
55 static const UChar u_S=0x53;
56 static const UChar u_T=0x54;
57 static const UChar u_U=0x55;
58 static const UChar u_Z=0x5A;
59 static const UChar u_a=0x61;
60 static const UChar u_c=0x63;
61 static const UChar u_d=0x64;
62 static const UChar u_e=0x65;
63 static const UChar u_f=0x66;
64 static const UChar u_h=0x68;
65 static const UChar u_i=0x69;
66 static const UChar u_l=0x6C;
67 static const UChar u_n=0x6E;
68 static const UChar u_o=0x6F;
69 static const UChar u_p=0x70;
70 static const UChar u_r=0x72;
71 static const UChar u_s=0x73;
72 static const UChar u_t=0x74;
73 static const UChar u_u=0x75;
74 static const UChar u_z=0x7A;
75 static const UChar u_leftCurlyBrace=0x7B;
76 static const UChar u_pipe=0x7C;
77 static const UChar u_rightCurlyBrace=0x7D;
78 static const UChar u_lessOrEqual=0x2264;  // U+2264 is <=
79 
80 static const UChar kOffsetColon[]={  // "offset:"
81     u_o, u_f, u_f, u_s, u_e, u_t, u_colon
82 };
83 
84 static const UChar kOther[]={  // "other"
85     u_o, u_t, u_h, u_e, u_r
86 };
87 
88 // MessagePatternList ------------------------------------------------------ ***
89 
90 template<typename T, int32_t stackCapacity>
91 class MessagePatternList : public UMemory {
92 public:
MessagePatternList()93     MessagePatternList() {}
94     void copyFrom(const MessagePatternList<T, stackCapacity> &other,
95                   int32_t length,
96                   UErrorCode &errorCode);
97     UBool ensureCapacityForOneMore(int32_t oldLength, UErrorCode &errorCode);
equals(const MessagePatternList<T,stackCapacity> & other,int32_t length) const98     UBool equals(const MessagePatternList<T, stackCapacity> &other, int32_t length) const {
99         for(int32_t i=0; i<length; ++i) {
100             if(a[i]!=other.a[i]) { return FALSE; }
101         }
102         return TRUE;
103     }
104 
105     MaybeStackArray<T, stackCapacity> a;
106 };
107 
108 template<typename T, int32_t stackCapacity>
109 void
copyFrom(const MessagePatternList<T,stackCapacity> & other,int32_t length,UErrorCode & errorCode)110 MessagePatternList<T, stackCapacity>::copyFrom(
111         const MessagePatternList<T, stackCapacity> &other,
112         int32_t length,
113         UErrorCode &errorCode) {
114     if(U_SUCCESS(errorCode) && length>0) {
115         if(length>a.getCapacity() && NULL==a.resize(length)) {
116             errorCode=U_MEMORY_ALLOCATION_ERROR;
117             return;
118         }
119         uprv_memcpy(a.getAlias(), other.a.getAlias(), (size_t)length*sizeof(T));
120     }
121 }
122 
123 template<typename T, int32_t stackCapacity>
124 UBool
ensureCapacityForOneMore(int32_t oldLength,UErrorCode & errorCode)125 MessagePatternList<T, stackCapacity>::ensureCapacityForOneMore(int32_t oldLength, UErrorCode &errorCode) {
126     if(U_FAILURE(errorCode)) {
127         return FALSE;
128     }
129     if(a.getCapacity()>oldLength || a.resize(2*oldLength, oldLength)!=NULL) {
130         return TRUE;
131     }
132     errorCode=U_MEMORY_ALLOCATION_ERROR;
133     return FALSE;
134 }
135 
136 // MessagePatternList specializations -------------------------------------- ***
137 
138 class MessagePatternDoubleList : public MessagePatternList<double, 8> {
139 };
140 
141 class MessagePatternPartsList : public MessagePatternList<MessagePattern::Part, 32> {
142 };
143 
144 // MessagePattern constructors etc. ---------------------------------------- ***
145 
MessagePattern(UErrorCode & errorCode)146 MessagePattern::MessagePattern(UErrorCode &errorCode)
147         : aposMode(UCONFIG_MSGPAT_DEFAULT_APOSTROPHE_MODE),
148           partsList(NULL), parts(NULL), partsLength(0),
149           numericValuesList(NULL), numericValues(NULL), numericValuesLength(0),
150           hasArgNames(FALSE), hasArgNumbers(FALSE), needsAutoQuoting(FALSE) {
151     init(errorCode);
152 }
153 
MessagePattern(UMessagePatternApostropheMode mode,UErrorCode & errorCode)154 MessagePattern::MessagePattern(UMessagePatternApostropheMode mode, UErrorCode &errorCode)
155         : aposMode(mode),
156           partsList(NULL), parts(NULL), partsLength(0),
157           numericValuesList(NULL), numericValues(NULL), numericValuesLength(0),
158           hasArgNames(FALSE), hasArgNumbers(FALSE), needsAutoQuoting(FALSE) {
159     init(errorCode);
160 }
161 
MessagePattern(const UnicodeString & pattern,UParseError * parseError,UErrorCode & errorCode)162 MessagePattern::MessagePattern(const UnicodeString &pattern, UParseError *parseError, UErrorCode &errorCode)
163         : aposMode(UCONFIG_MSGPAT_DEFAULT_APOSTROPHE_MODE),
164           partsList(NULL), parts(NULL), partsLength(0),
165           numericValuesList(NULL), numericValues(NULL), numericValuesLength(0),
166           hasArgNames(FALSE), hasArgNumbers(FALSE), needsAutoQuoting(FALSE) {
167     if(init(errorCode)) {
168         parse(pattern, parseError, errorCode);
169     }
170 }
171 
172 UBool
init(UErrorCode & errorCode)173 MessagePattern::init(UErrorCode &errorCode) {
174     if(U_FAILURE(errorCode)) {
175         return FALSE;
176     }
177     partsList=new MessagePatternPartsList();
178     if(partsList==NULL) {
179         errorCode=U_MEMORY_ALLOCATION_ERROR;
180         return FALSE;
181     }
182     parts=partsList->a.getAlias();
183     return TRUE;
184 }
185 
MessagePattern(const MessagePattern & other)186 MessagePattern::MessagePattern(const MessagePattern &other)
187         : UObject(other), aposMode(other.aposMode), msg(other.msg),
188           partsList(NULL), parts(NULL), partsLength(0),
189           numericValuesList(NULL), numericValues(NULL), numericValuesLength(0),
190           hasArgNames(other.hasArgNames), hasArgNumbers(other.hasArgNumbers),
191           needsAutoQuoting(other.needsAutoQuoting) {
192     UErrorCode errorCode=U_ZERO_ERROR;
193     if(!copyStorage(other, errorCode)) {
194         clear();
195     }
196 }
197 
198 MessagePattern &
operator =(const MessagePattern & other)199 MessagePattern::operator=(const MessagePattern &other) {
200     if(this==&other) {
201         return *this;
202     }
203     aposMode=other.aposMode;
204     msg=other.msg;
205     hasArgNames=other.hasArgNames;
206     hasArgNumbers=other.hasArgNumbers;
207     needsAutoQuoting=other.needsAutoQuoting;
208     UErrorCode errorCode=U_ZERO_ERROR;
209     if(!copyStorage(other, errorCode)) {
210         clear();
211     }
212     return *this;
213 }
214 
215 UBool
copyStorage(const MessagePattern & other,UErrorCode & errorCode)216 MessagePattern::copyStorage(const MessagePattern &other, UErrorCode &errorCode) {
217     if(U_FAILURE(errorCode)) {
218         return FALSE;
219     }
220     parts=NULL;
221     partsLength=0;
222     numericValues=NULL;
223     numericValuesLength=0;
224     if(partsList==NULL) {
225         partsList=new MessagePatternPartsList();
226         if(partsList==NULL) {
227             errorCode=U_MEMORY_ALLOCATION_ERROR;
228             return FALSE;
229         }
230         parts=partsList->a.getAlias();
231     }
232     if(other.partsLength>0) {
233         partsList->copyFrom(*other.partsList, other.partsLength, errorCode);
234         if(U_FAILURE(errorCode)) {
235             return FALSE;
236         }
237         parts=partsList->a.getAlias();
238         partsLength=other.partsLength;
239     }
240     if(other.numericValuesLength>0) {
241         if(numericValuesList==NULL) {
242             numericValuesList=new MessagePatternDoubleList();
243             if(numericValuesList==NULL) {
244                 errorCode=U_MEMORY_ALLOCATION_ERROR;
245                 return FALSE;
246             }
247             numericValues=numericValuesList->a.getAlias();
248         }
249         numericValuesList->copyFrom(
250             *other.numericValuesList, other.numericValuesLength, errorCode);
251         if(U_FAILURE(errorCode)) {
252             return FALSE;
253         }
254         numericValues=numericValuesList->a.getAlias();
255         numericValuesLength=other.numericValuesLength;
256     }
257     return TRUE;
258 }
259 
~MessagePattern()260 MessagePattern::~MessagePattern() {
261     delete partsList;
262     delete numericValuesList;
263 }
264 
265 // MessagePattern API ------------------------------------------------------ ***
266 
267 MessagePattern &
parse(const UnicodeString & pattern,UParseError * parseError,UErrorCode & errorCode)268 MessagePattern::parse(const UnicodeString &pattern, UParseError *parseError, UErrorCode &errorCode) {
269     preParse(pattern, parseError, errorCode);
270     parseMessage(0, 0, 0, UMSGPAT_ARG_TYPE_NONE, parseError, errorCode);
271     postParse();
272     return *this;
273 }
274 
275 MessagePattern &
parseChoiceStyle(const UnicodeString & pattern,UParseError * parseError,UErrorCode & errorCode)276 MessagePattern::parseChoiceStyle(const UnicodeString &pattern,
277                                  UParseError *parseError, UErrorCode &errorCode) {
278     preParse(pattern, parseError, errorCode);
279     parseChoiceStyle(0, 0, parseError, errorCode);
280     postParse();
281     return *this;
282 }
283 
284 MessagePattern &
parsePluralStyle(const UnicodeString & pattern,UParseError * parseError,UErrorCode & errorCode)285 MessagePattern::parsePluralStyle(const UnicodeString &pattern,
286                                  UParseError *parseError, UErrorCode &errorCode) {
287     preParse(pattern, parseError, errorCode);
288     parsePluralOrSelectStyle(UMSGPAT_ARG_TYPE_PLURAL, 0, 0, parseError, errorCode);
289     postParse();
290     return *this;
291 }
292 
293 MessagePattern &
parseSelectStyle(const UnicodeString & pattern,UParseError * parseError,UErrorCode & errorCode)294 MessagePattern::parseSelectStyle(const UnicodeString &pattern,
295                                  UParseError *parseError, UErrorCode &errorCode) {
296     preParse(pattern, parseError, errorCode);
297     parsePluralOrSelectStyle(UMSGPAT_ARG_TYPE_SELECT, 0, 0, parseError, errorCode);
298     postParse();
299     return *this;
300 }
301 
302 void
clear()303 MessagePattern::clear() {
304     // Mostly the same as preParse().
305     msg.remove();
306     hasArgNames=hasArgNumbers=FALSE;
307     needsAutoQuoting=FALSE;
308     partsLength=0;
309     numericValuesLength=0;
310 }
311 
312 UBool
operator ==(const MessagePattern & other) const313 MessagePattern::operator==(const MessagePattern &other) const {
314     if(this==&other) {
315         return TRUE;
316     }
317     return
318         aposMode==other.aposMode &&
319         msg==other.msg &&
320         // parts.equals(o.parts)
321         partsLength==other.partsLength &&
322         (partsLength==0 || partsList->equals(*other.partsList, partsLength));
323     // No need to compare numericValues if msg and parts are the same.
324 }
325 
326 int32_t
hashCode() const327 MessagePattern::hashCode() const {
328     int32_t hash=(aposMode*37+msg.hashCode())*37+partsLength;
329     for(int32_t i=0; i<partsLength; ++i) {
330         hash=hash*37+parts[i].hashCode();
331     }
332     return hash;
333 }
334 
335 int32_t
validateArgumentName(const UnicodeString & name)336 MessagePattern::validateArgumentName(const UnicodeString &name) {
337     if(!PatternProps::isIdentifier(name.getBuffer(), name.length())) {
338         return UMSGPAT_ARG_NAME_NOT_VALID;
339     }
340     return parseArgNumber(name, 0, name.length());
341 }
342 
343 UnicodeString
autoQuoteApostropheDeep() const344 MessagePattern::autoQuoteApostropheDeep() const {
345     if(!needsAutoQuoting) {
346         return msg;
347     }
348     UnicodeString modified(msg);
349     // Iterate backward so that the insertion indexes do not change.
350     int32_t count=countParts();
351     for(int32_t i=count; i>0;) {
352         const Part &part=getPart(--i);
353         if(part.getType()==UMSGPAT_PART_TYPE_INSERT_CHAR) {
354            modified.insert(part.index, (UChar)part.value);
355         }
356     }
357     return modified;
358 }
359 
360 double
getNumericValue(const Part & part) const361 MessagePattern::getNumericValue(const Part &part) const {
362     UMessagePatternPartType type=part.type;
363     if(type==UMSGPAT_PART_TYPE_ARG_INT) {
364         return part.value;
365     } else if(type==UMSGPAT_PART_TYPE_ARG_DOUBLE) {
366         return numericValues[part.value];
367     } else {
368         return UMSGPAT_NO_NUMERIC_VALUE;
369     }
370 }
371 
372 /**
373   * Returns the "offset:" value of a PluralFormat argument, or 0 if none is specified.
374   * @param pluralStart the index of the first PluralFormat argument style part. (0..countParts()-1)
375   * @return the "offset:" value.
376   * @draft ICU 4.8
377   */
378 double
getPluralOffset(int32_t pluralStart) const379 MessagePattern::getPluralOffset(int32_t pluralStart) const {
380     const Part &part=getPart(pluralStart);
381     if(Part::hasNumericValue(part.type)) {
382         return getNumericValue(part);
383     } else {
384         return 0;
385     }
386 }
387 
388 // MessagePattern::Part ---------------------------------------------------- ***
389 
390 UBool
operator ==(const Part & other) const391 MessagePattern::Part::operator==(const Part &other) const {
392     if(this==&other) {
393         return TRUE;
394     }
395     return
396         type==other.type &&
397         index==other.index &&
398         length==other.length &&
399         value==other.value &&
400         limitPartIndex==other.limitPartIndex;
401 }
402 
403 // MessagePattern parser --------------------------------------------------- ***
404 
405 void
preParse(const UnicodeString & pattern,UParseError * parseError,UErrorCode & errorCode)406 MessagePattern::preParse(const UnicodeString &pattern, UParseError *parseError, UErrorCode &errorCode) {
407     if(U_FAILURE(errorCode)) {
408         return;
409     }
410     if(parseError!=NULL) {
411         parseError->line=0;
412         parseError->offset=0;
413         parseError->preContext[0]=0;
414         parseError->postContext[0]=0;
415     }
416     msg=pattern;
417     hasArgNames=hasArgNumbers=FALSE;
418     needsAutoQuoting=FALSE;
419     partsLength=0;
420     numericValuesLength=0;
421 }
422 
423 void
postParse()424 MessagePattern::postParse() {
425     if(partsList!=NULL) {
426         parts=partsList->a.getAlias();
427     }
428     if(numericValuesList!=NULL) {
429         numericValues=numericValuesList->a.getAlias();
430     }
431 }
432 
433 int32_t
parseMessage(int32_t index,int32_t msgStartLength,int32_t nestingLevel,UMessagePatternArgType parentType,UParseError * parseError,UErrorCode & errorCode)434 MessagePattern::parseMessage(int32_t index, int32_t msgStartLength,
435                              int32_t nestingLevel, UMessagePatternArgType parentType,
436                              UParseError *parseError, UErrorCode &errorCode) {
437     if(U_FAILURE(errorCode)) {
438         return 0;
439     }
440     if(nestingLevel>Part::MAX_VALUE) {
441         errorCode=U_INDEX_OUTOFBOUNDS_ERROR;
442         return 0;
443     }
444     int32_t msgStart=partsLength;
445     addPart(UMSGPAT_PART_TYPE_MSG_START, index, msgStartLength, nestingLevel, errorCode);
446     index+=msgStartLength;
447     for(;;) {  // while(index<msg.length()) with U_FAILURE(errorCode) check
448         if(U_FAILURE(errorCode)) {
449             return 0;
450         }
451         if(index>=msg.length()) {
452             break;
453         }
454         UChar c=msg.charAt(index++);
455         if(c==u_apos) {
456             if(index==msg.length()) {
457                 // The apostrophe is the last character in the pattern.
458                 // Add a Part for auto-quoting.
459                 addPart(UMSGPAT_PART_TYPE_INSERT_CHAR, index, 0,
460                         u_apos, errorCode);  // value=char to be inserted
461                 needsAutoQuoting=TRUE;
462             } else {
463                 c=msg.charAt(index);
464                 if(c==u_apos) {
465                     // double apostrophe, skip the second one
466                     addPart(UMSGPAT_PART_TYPE_SKIP_SYNTAX, index++, 1, 0, errorCode);
467                 } else if(
468                     aposMode==UMSGPAT_APOS_DOUBLE_REQUIRED ||
469                     c==u_leftCurlyBrace || c==u_rightCurlyBrace ||
470                     (parentType==UMSGPAT_ARG_TYPE_CHOICE && c==u_pipe) ||
471                     (UMSGPAT_ARG_TYPE_HAS_PLURAL_STYLE(parentType) && c==u_pound)
472                 ) {
473                     // skip the quote-starting apostrophe
474                     addPart(UMSGPAT_PART_TYPE_SKIP_SYNTAX, index-1, 1, 0, errorCode);
475                     // find the end of the quoted literal text
476                     for(;;) {
477                         index=msg.indexOf(u_apos, index+1);
478                         if(index>=0) {
479                             if(/*(index+1)<msg.length() &&*/ msg.charAt(index+1)==u_apos) {
480                                 // double apostrophe inside quoted literal text
481                                 // still encodes a single apostrophe, skip the second one
482                                 addPart(UMSGPAT_PART_TYPE_SKIP_SYNTAX, ++index, 1, 0, errorCode);
483                             } else {
484                                 // skip the quote-ending apostrophe
485                                 addPart(UMSGPAT_PART_TYPE_SKIP_SYNTAX, index++, 1, 0, errorCode);
486                                 break;
487                             }
488                         } else {
489                             // The quoted text reaches to the end of the of the message.
490                             index=msg.length();
491                             // Add a Part for auto-quoting.
492                             addPart(UMSGPAT_PART_TYPE_INSERT_CHAR, index, 0,
493                                     u_apos, errorCode);  // value=char to be inserted
494                             needsAutoQuoting=TRUE;
495                             break;
496                         }
497                     }
498                 } else {
499                     // Interpret the apostrophe as literal text.
500                     // Add a Part for auto-quoting.
501                     addPart(UMSGPAT_PART_TYPE_INSERT_CHAR, index, 0,
502                             u_apos, errorCode);  // value=char to be inserted
503                     needsAutoQuoting=TRUE;
504                 }
505             }
506         } else if(UMSGPAT_ARG_TYPE_HAS_PLURAL_STYLE(parentType) && c==u_pound) {
507             // The unquoted # in a plural message fragment will be replaced
508             // with the (number-offset).
509             addPart(UMSGPAT_PART_TYPE_REPLACE_NUMBER, index-1, 1, 0, errorCode);
510         } else if(c==u_leftCurlyBrace) {
511             index=parseArg(index-1, 1, nestingLevel, parseError, errorCode);
512         } else if((nestingLevel>0 && c==u_rightCurlyBrace) ||
513                   (parentType==UMSGPAT_ARG_TYPE_CHOICE && c==u_pipe)) {
514             // Finish the message before the terminator.
515             // In a choice style, report the "}" substring only for the following ARG_LIMIT,
516             // not for this MSG_LIMIT.
517             int32_t limitLength=(parentType==UMSGPAT_ARG_TYPE_CHOICE && c==u_rightCurlyBrace) ? 0 : 1;
518             addLimitPart(msgStart, UMSGPAT_PART_TYPE_MSG_LIMIT, index-1, limitLength,
519                          nestingLevel, errorCode);
520             if(parentType==UMSGPAT_ARG_TYPE_CHOICE) {
521                 // Let the choice style parser see the '}' or '|'.
522                 return index-1;
523             } else {
524                 // continue parsing after the '}'
525                 return index;
526             }
527         }  // else: c is part of literal text
528     }
529     if(nestingLevel>0 && !inTopLevelChoiceMessage(nestingLevel, parentType)) {
530         setParseError(parseError, 0);  // Unmatched '{' braces in message.
531         errorCode=U_UNMATCHED_BRACES;
532         return 0;
533     }
534     addLimitPart(msgStart, UMSGPAT_PART_TYPE_MSG_LIMIT, index, 0, nestingLevel, errorCode);
535     return index;
536 }
537 
538 int32_t
parseArg(int32_t index,int32_t argStartLength,int32_t nestingLevel,UParseError * parseError,UErrorCode & errorCode)539 MessagePattern::parseArg(int32_t index, int32_t argStartLength, int32_t nestingLevel,
540                          UParseError *parseError, UErrorCode &errorCode) {
541     int32_t argStart=partsLength;
542     UMessagePatternArgType argType=UMSGPAT_ARG_TYPE_NONE;
543     addPart(UMSGPAT_PART_TYPE_ARG_START, index, argStartLength, argType, errorCode);
544     if(U_FAILURE(errorCode)) {
545         return 0;
546     }
547     int32_t nameIndex=index=skipWhiteSpace(index+argStartLength);
548     if(index==msg.length()) {
549         setParseError(parseError, 0);  // Unmatched '{' braces in message.
550         errorCode=U_UNMATCHED_BRACES;
551         return 0;
552     }
553     // parse argument name or number
554     index=skipIdentifier(index);
555     int32_t number=parseArgNumber(nameIndex, index);
556     if(number>=0) {
557         int32_t length=index-nameIndex;
558         if(length>Part::MAX_LENGTH || number>Part::MAX_VALUE) {
559             setParseError(parseError, nameIndex);  // Argument number too large.
560             errorCode=U_INDEX_OUTOFBOUNDS_ERROR;
561             return 0;
562         }
563         hasArgNumbers=TRUE;
564         addPart(UMSGPAT_PART_TYPE_ARG_NUMBER, nameIndex, length, number, errorCode);
565     } else if(number==UMSGPAT_ARG_NAME_NOT_NUMBER) {
566         int32_t length=index-nameIndex;
567         if(length>Part::MAX_LENGTH) {
568             setParseError(parseError, nameIndex);  // Argument name too long.
569             errorCode=U_INDEX_OUTOFBOUNDS_ERROR;
570             return 0;
571         }
572         hasArgNames=TRUE;
573         addPart(UMSGPAT_PART_TYPE_ARG_NAME, nameIndex, length, 0, errorCode);
574     } else {  // number<-1 (ARG_NAME_NOT_VALID)
575         setParseError(parseError, nameIndex);  // Bad argument syntax.
576         errorCode=U_PATTERN_SYNTAX_ERROR;
577         return 0;
578     }
579     index=skipWhiteSpace(index);
580     if(index==msg.length()) {
581         setParseError(parseError, 0);  // Unmatched '{' braces in message.
582         errorCode=U_UNMATCHED_BRACES;
583         return 0;
584     }
585     UChar c=msg.charAt(index);
586     if(c==u_rightCurlyBrace) {
587         // all done
588     } else if(c!=u_comma) {
589         setParseError(parseError, nameIndex);  // Bad argument syntax.
590         errorCode=U_PATTERN_SYNTAX_ERROR;
591         return 0;
592     } else /* ',' */ {
593         // parse argument type: case-sensitive a-zA-Z
594         int32_t typeIndex=index=skipWhiteSpace(index+1);
595         while(index<msg.length() && isArgTypeChar(msg.charAt(index))) {
596             ++index;
597         }
598         int32_t length=index-typeIndex;
599         index=skipWhiteSpace(index);
600         if(index==msg.length()) {
601             setParseError(parseError, 0);  // Unmatched '{' braces in message.
602             errorCode=U_UNMATCHED_BRACES;
603             return 0;
604         }
605         if(length==0 || ((c=msg.charAt(index))!=u_comma && c!=u_rightCurlyBrace)) {
606             setParseError(parseError, nameIndex);  // Bad argument syntax.
607             errorCode=U_PATTERN_SYNTAX_ERROR;
608             return 0;
609         }
610         if(length>Part::MAX_LENGTH) {
611             setParseError(parseError, nameIndex);  // Argument type name too long.
612             errorCode=U_INDEX_OUTOFBOUNDS_ERROR;
613             return 0;
614         }
615         argType=UMSGPAT_ARG_TYPE_SIMPLE;
616         if(length==6) {
617             // case-insensitive comparisons for complex-type names
618             if(isChoice(typeIndex)) {
619                 argType=UMSGPAT_ARG_TYPE_CHOICE;
620             } else if(isPlural(typeIndex)) {
621                 argType=UMSGPAT_ARG_TYPE_PLURAL;
622             } else if(isSelect(typeIndex)) {
623                 argType=UMSGPAT_ARG_TYPE_SELECT;
624             }
625         } else if(length==13) {
626             if(isSelect(typeIndex) && isOrdinal(typeIndex+6)) {
627                 argType=UMSGPAT_ARG_TYPE_SELECTORDINAL;
628             }
629         }
630         // change the ARG_START type from NONE to argType
631         partsList->a[argStart].value=(int16_t)argType;
632         if(argType==UMSGPAT_ARG_TYPE_SIMPLE) {
633             addPart(UMSGPAT_PART_TYPE_ARG_TYPE, typeIndex, length, 0, errorCode);
634         }
635         // look for an argument style (pattern)
636         if(c==u_rightCurlyBrace) {
637             if(argType!=UMSGPAT_ARG_TYPE_SIMPLE) {
638                 setParseError(parseError, nameIndex);  // No style field for complex argument.
639                 errorCode=U_PATTERN_SYNTAX_ERROR;
640                 return 0;
641             }
642         } else /* ',' */ {
643             ++index;
644             if(argType==UMSGPAT_ARG_TYPE_SIMPLE) {
645                 index=parseSimpleStyle(index, parseError, errorCode);
646             } else if(argType==UMSGPAT_ARG_TYPE_CHOICE) {
647                 index=parseChoiceStyle(index, nestingLevel, parseError, errorCode);
648             } else {
649                 index=parsePluralOrSelectStyle(argType, index, nestingLevel, parseError, errorCode);
650             }
651         }
652     }
653     // Argument parsing stopped on the '}'.
654     addLimitPart(argStart, UMSGPAT_PART_TYPE_ARG_LIMIT, index, 1, argType, errorCode);
655     return index+1;
656 }
657 
658 int32_t
parseSimpleStyle(int32_t index,UParseError * parseError,UErrorCode & errorCode)659 MessagePattern::parseSimpleStyle(int32_t index, UParseError *parseError, UErrorCode &errorCode) {
660     if(U_FAILURE(errorCode)) {
661         return 0;
662     }
663     int32_t start=index;
664     int32_t nestedBraces=0;
665     while(index<msg.length()) {
666         UChar c=msg.charAt(index++);
667         if(c==u_apos) {
668             // Treat apostrophe as quoting but include it in the style part.
669             // Find the end of the quoted literal text.
670             index=msg.indexOf(u_apos, index);
671             if(index<0) {
672                 // Quoted literal argument style text reaches to the end of the message.
673                 setParseError(parseError, start);
674                 errorCode=U_PATTERN_SYNTAX_ERROR;
675                 return 0;
676             }
677             // skip the quote-ending apostrophe
678             ++index;
679         } else if(c==u_leftCurlyBrace) {
680             ++nestedBraces;
681         } else if(c==u_rightCurlyBrace) {
682             if(nestedBraces>0) {
683                 --nestedBraces;
684             } else {
685                 int32_t length=--index-start;
686                 if(length>Part::MAX_LENGTH) {
687                     setParseError(parseError, start);  // Argument style text too long.
688                     errorCode=U_INDEX_OUTOFBOUNDS_ERROR;
689                     return 0;
690                 }
691                 addPart(UMSGPAT_PART_TYPE_ARG_STYLE, start, length, 0, errorCode);
692                 return index;
693             }
694         }  // c is part of literal text
695     }
696     setParseError(parseError, 0);  // Unmatched '{' braces in message.
697     errorCode=U_UNMATCHED_BRACES;
698     return 0;
699 }
700 
701 int32_t
parseChoiceStyle(int32_t index,int32_t nestingLevel,UParseError * parseError,UErrorCode & errorCode)702 MessagePattern::parseChoiceStyle(int32_t index, int32_t nestingLevel,
703                                  UParseError *parseError, UErrorCode &errorCode) {
704     if(U_FAILURE(errorCode)) {
705         return 0;
706     }
707     int32_t start=index;
708     index=skipWhiteSpace(index);
709     if(index==msg.length() || msg.charAt(index)==u_rightCurlyBrace) {
710         setParseError(parseError, 0);  // Missing choice argument pattern.
711         errorCode=U_PATTERN_SYNTAX_ERROR;
712         return 0;
713     }
714     for(;;) {
715         // The choice argument style contains |-separated (number, separator, message) triples.
716         // Parse the number.
717         int32_t numberIndex=index;
718         index=skipDouble(index);
719         int32_t length=index-numberIndex;
720         if(length==0) {
721             setParseError(parseError, start);  // Bad choice pattern syntax.
722             errorCode=U_PATTERN_SYNTAX_ERROR;
723             return 0;
724         }
725         if(length>Part::MAX_LENGTH) {
726             setParseError(parseError, numberIndex);  // Choice number too long.
727             errorCode=U_INDEX_OUTOFBOUNDS_ERROR;
728             return 0;
729         }
730         parseDouble(numberIndex, index, TRUE, parseError, errorCode);  // adds ARG_INT or ARG_DOUBLE
731         if(U_FAILURE(errorCode)) {
732             return 0;
733         }
734         // Parse the separator.
735         index=skipWhiteSpace(index);
736         if(index==msg.length()) {
737             setParseError(parseError, start);  // Bad choice pattern syntax.
738             errorCode=U_PATTERN_SYNTAX_ERROR;
739             return 0;
740         }
741         UChar c=msg.charAt(index);
742         if(!(c==u_pound || c==u_lessThan || c==u_lessOrEqual)) {  // U+2264 is <=
743             setParseError(parseError, start);  // Expected choice separator (#<\u2264) instead of c.
744             errorCode=U_PATTERN_SYNTAX_ERROR;
745             return 0;
746         }
747         addPart(UMSGPAT_PART_TYPE_ARG_SELECTOR, index, 1, 0, errorCode);
748         // Parse the message fragment.
749         index=parseMessage(++index, 0, nestingLevel+1, UMSGPAT_ARG_TYPE_CHOICE, parseError, errorCode);
750         if(U_FAILURE(errorCode)) {
751             return 0;
752         }
753         // parseMessage(..., CHOICE) returns the index of the terminator, or msg.length().
754         if(index==msg.length()) {
755             return index;
756         }
757         if(msg.charAt(index)==u_rightCurlyBrace) {
758             if(!inMessageFormatPattern(nestingLevel)) {
759                 setParseError(parseError, start);  // Bad choice pattern syntax.
760                 errorCode=U_PATTERN_SYNTAX_ERROR;
761                 return 0;
762             }
763             return index;
764         }  // else the terminator is '|'
765         index=skipWhiteSpace(index+1);
766     }
767 }
768 
769 int32_t
parsePluralOrSelectStyle(UMessagePatternArgType argType,int32_t index,int32_t nestingLevel,UParseError * parseError,UErrorCode & errorCode)770 MessagePattern::parsePluralOrSelectStyle(UMessagePatternArgType argType,
771                                          int32_t index, int32_t nestingLevel,
772                                          UParseError *parseError, UErrorCode &errorCode) {
773     if(U_FAILURE(errorCode)) {
774         return 0;
775     }
776     int32_t start=index;
777     UBool isEmpty=TRUE;
778     UBool hasOther=FALSE;
779     for(;;) {
780         // First, collect the selector looking for a small set of terminators.
781         // It would be a little faster to consider the syntax of each possible
782         // token right here, but that makes the code too complicated.
783         index=skipWhiteSpace(index);
784         UBool eos=index==msg.length();
785         if(eos || msg.charAt(index)==u_rightCurlyBrace) {
786             if(eos==inMessageFormatPattern(nestingLevel)) {
787                 setParseError(parseError, start);  // Bad plural/select pattern syntax.
788                 errorCode=U_PATTERN_SYNTAX_ERROR;
789                 return 0;
790             }
791             if(!hasOther) {
792                 setParseError(parseError, 0);  // Missing 'other' keyword in plural/select pattern.
793                 errorCode=U_DEFAULT_KEYWORD_MISSING;
794                 return 0;
795             }
796             return index;
797         }
798         int32_t selectorIndex=index;
799         if(UMSGPAT_ARG_TYPE_HAS_PLURAL_STYLE(argType) && msg.charAt(selectorIndex)==u_equal) {
800             // explicit-value plural selector: =double
801             index=skipDouble(index+1);
802             int32_t length=index-selectorIndex;
803             if(length==1) {
804                 setParseError(parseError, start);  // Bad plural/select pattern syntax.
805                 errorCode=U_PATTERN_SYNTAX_ERROR;
806                 return 0;
807             }
808             if(length>Part::MAX_LENGTH) {
809                 setParseError(parseError, selectorIndex);  // Argument selector too long.
810                 errorCode=U_INDEX_OUTOFBOUNDS_ERROR;
811                 return 0;
812             }
813             addPart(UMSGPAT_PART_TYPE_ARG_SELECTOR, selectorIndex, length, 0, errorCode);
814             parseDouble(selectorIndex+1, index, FALSE,
815                         parseError, errorCode);  // adds ARG_INT or ARG_DOUBLE
816         } else {
817             index=skipIdentifier(index);
818             int32_t length=index-selectorIndex;
819             if(length==0) {
820                 setParseError(parseError, start);  // Bad plural/select pattern syntax.
821                 errorCode=U_PATTERN_SYNTAX_ERROR;
822                 return 0;
823             }
824             // Note: The ':' in "offset:" is just beyond the skipIdentifier() range.
825             if( UMSGPAT_ARG_TYPE_HAS_PLURAL_STYLE(argType) && length==6 && index<msg.length() &&
826                 0==msg.compare(selectorIndex, 7, kOffsetColon, 0, 7)
827             ) {
828                 // plural offset, not a selector
829                 if(!isEmpty) {
830                     // Plural argument 'offset:' (if present) must precede key-message pairs.
831                     setParseError(parseError, start);
832                     errorCode=U_PATTERN_SYNTAX_ERROR;
833                     return 0;
834                 }
835                 // allow whitespace between offset: and its value
836                 int32_t valueIndex=skipWhiteSpace(index+1);  // The ':' is at index.
837                 index=skipDouble(valueIndex);
838                 if(index==valueIndex) {
839                     setParseError(parseError, start);  // Missing value for plural 'offset:'.
840                     errorCode=U_PATTERN_SYNTAX_ERROR;
841                     return 0;
842                 }
843                 if((index-valueIndex)>Part::MAX_LENGTH) {
844                     setParseError(parseError, valueIndex);  // Plural offset value too long.
845                     errorCode=U_INDEX_OUTOFBOUNDS_ERROR;
846                     return 0;
847                 }
848                 parseDouble(valueIndex, index, FALSE,
849                             parseError, errorCode);  // adds ARG_INT or ARG_DOUBLE
850                 if(U_FAILURE(errorCode)) {
851                     return 0;
852                 }
853                 isEmpty=FALSE;
854                 continue;  // no message fragment after the offset
855             } else {
856                 // normal selector word
857                 if(length>Part::MAX_LENGTH) {
858                     setParseError(parseError, selectorIndex);  // Argument selector too long.
859                     errorCode=U_INDEX_OUTOFBOUNDS_ERROR;
860                     return 0;
861                 }
862                 addPart(UMSGPAT_PART_TYPE_ARG_SELECTOR, selectorIndex, length, 0, errorCode);
863                 if(0==msg.compare(selectorIndex, length, kOther, 0, 5)) {
864                     hasOther=TRUE;
865                 }
866             }
867         }
868         if(U_FAILURE(errorCode)) {
869             return 0;
870         }
871 
872         // parse the message fragment following the selector
873         index=skipWhiteSpace(index);
874         if(index==msg.length() || msg.charAt(index)!=u_leftCurlyBrace) {
875             setParseError(parseError, selectorIndex);  // No message fragment after plural/select selector.
876             errorCode=U_PATTERN_SYNTAX_ERROR;
877             return 0;
878         }
879         index=parseMessage(index, 1, nestingLevel+1, argType, parseError, errorCode);
880         if(U_FAILURE(errorCode)) {
881             return 0;
882         }
883         isEmpty=FALSE;
884     }
885 }
886 
887 int32_t
parseArgNumber(const UnicodeString & s,int32_t start,int32_t limit)888 MessagePattern::parseArgNumber(const UnicodeString &s, int32_t start, int32_t limit) {
889     // If the identifier contains only ASCII digits, then it is an argument _number_
890     // and must not have leading zeros (except "0" itself).
891     // Otherwise it is an argument _name_.
892     if(start>=limit) {
893         return UMSGPAT_ARG_NAME_NOT_VALID;
894     }
895     int32_t number;
896     // Defer numeric errors until we know there are only digits.
897     UBool badNumber;
898     UChar c=s.charAt(start++);
899     if(c==0x30) {
900         if(start==limit) {
901             return 0;
902         } else {
903             number=0;
904             badNumber=TRUE;  // leading zero
905         }
906     } else if(0x31<=c && c<=0x39) {
907         number=c-0x30;
908         badNumber=FALSE;
909     } else {
910         return UMSGPAT_ARG_NAME_NOT_NUMBER;
911     }
912     while(start<limit) {
913         c=s.charAt(start++);
914         if(0x30<=c && c<=0x39) {
915             if(number>=INT32_MAX/10) {
916                 badNumber=TRUE;  // overflow
917             }
918             number=number*10+(c-0x30);
919         } else {
920             return UMSGPAT_ARG_NAME_NOT_NUMBER;
921         }
922     }
923     // There are only ASCII digits.
924     if(badNumber) {
925         return UMSGPAT_ARG_NAME_NOT_VALID;
926     } else {
927         return number;
928     }
929 }
930 
931 void
parseDouble(int32_t start,int32_t limit,UBool allowInfinity,UParseError * parseError,UErrorCode & errorCode)932 MessagePattern::parseDouble(int32_t start, int32_t limit, UBool allowInfinity,
933                             UParseError *parseError, UErrorCode &errorCode) {
934     if(U_FAILURE(errorCode)) {
935         return;
936     }
937     U_ASSERT(start<limit);
938     // fake loop for easy exit and single throw statement
939     for(;;) { /*loop doesn't iterate*/
940         // fast path for small integers and infinity
941         int32_t value=0;
942         int32_t isNegative=0;  // not boolean so that we can easily add it to value
943         int32_t index=start;
944         UChar c=msg.charAt(index++);
945         if(c==u_minus) {
946             isNegative=1;
947             if(index==limit) {
948                 break;  // no number
949             }
950             c=msg.charAt(index++);
951         } else if(c==u_plus) {
952             if(index==limit) {
953                 break;  // no number
954             }
955             c=msg.charAt(index++);
956         }
957         if(c==0x221e) {  // infinity
958             if(allowInfinity && index==limit) {
959                 double infinity=uprv_getInfinity();
960                 addArgDoublePart(
961                     isNegative!=0 ? -infinity : infinity,
962                     start, limit-start, errorCode);
963                 return;
964             } else {
965                 break;
966             }
967         }
968         // try to parse the number as a small integer but fall back to a double
969         while('0'<=c && c<='9') {
970             value=value*10+(c-'0');
971             if(value>(Part::MAX_VALUE+isNegative)) {
972                 break;  // not a small-enough integer
973             }
974             if(index==limit) {
975                 addPart(UMSGPAT_PART_TYPE_ARG_INT, start, limit-start,
976                         isNegative!=0 ? -value : value, errorCode);
977                 return;
978             }
979             c=msg.charAt(index++);
980         }
981         // Let Double.parseDouble() throw a NumberFormatException.
982         char numberChars[128];
983         int32_t capacity=(int32_t)sizeof(numberChars);
984         int32_t length=limit-start;
985         if(length>=capacity) {
986             break;  // number too long
987         }
988         msg.extract(start, length, numberChars, capacity, US_INV);
989         if((int32_t)uprv_strlen(numberChars)<length) {
990             break;  // contains non-invariant character that was turned into NUL
991         }
992         char *end;
993         double numericValue=uprv_strtod(numberChars, &end);
994         if(end!=(numberChars+length)) {
995             break;  // parsing error
996         }
997         addArgDoublePart(numericValue, start, length, errorCode);
998         return;
999     }
1000     setParseError(parseError, start /*, limit*/);  // Bad syntax for numeric value.
1001     errorCode=U_PATTERN_SYNTAX_ERROR;
1002     return;
1003 }
1004 
1005 int32_t
skipWhiteSpace(int32_t index)1006 MessagePattern::skipWhiteSpace(int32_t index) {
1007     const UChar *s=msg.getBuffer();
1008     int32_t msgLength=msg.length();
1009     const UChar *t=PatternProps::skipWhiteSpace(s+index, msgLength-index);
1010     return (int32_t)(t-s);
1011 }
1012 
1013 int32_t
skipIdentifier(int32_t index)1014 MessagePattern::skipIdentifier(int32_t index) {
1015     const UChar *s=msg.getBuffer();
1016     int32_t msgLength=msg.length();
1017     const UChar *t=PatternProps::skipIdentifier(s+index, msgLength-index);
1018     return (int32_t)(t-s);
1019 }
1020 
1021 int32_t
skipDouble(int32_t index)1022 MessagePattern::skipDouble(int32_t index) {
1023     int32_t msgLength=msg.length();
1024     while(index<msgLength) {
1025         UChar c=msg.charAt(index);
1026         // U+221E: Allow the infinity symbol, for ChoiceFormat patterns.
1027         if((c<0x30 && c!=u_plus && c!=u_minus && c!=u_dot) || (c>0x39 && c!=u_e && c!=u_E && c!=0x221e)) {
1028             break;
1029         }
1030         ++index;
1031     }
1032     return index;
1033 }
1034 
1035 UBool
isArgTypeChar(UChar32 c)1036 MessagePattern::isArgTypeChar(UChar32 c) {
1037     return (u_a<=c && c<=u_z) || (u_A<=c && c<=u_Z);
1038 }
1039 
1040 UBool
isChoice(int32_t index)1041 MessagePattern::isChoice(int32_t index) {
1042     UChar c;
1043     return
1044         ((c=msg.charAt(index++))==u_c || c==u_C) &&
1045         ((c=msg.charAt(index++))==u_h || c==u_H) &&
1046         ((c=msg.charAt(index++))==u_o || c==u_O) &&
1047         ((c=msg.charAt(index++))==u_i || c==u_I) &&
1048         ((c=msg.charAt(index++))==u_c || c==u_C) &&
1049         ((c=msg.charAt(index))==u_e || c==u_E);
1050 }
1051 
1052 UBool
isPlural(int32_t index)1053 MessagePattern::isPlural(int32_t index) {
1054     UChar c;
1055     return
1056         ((c=msg.charAt(index++))==u_p || c==u_P) &&
1057         ((c=msg.charAt(index++))==u_l || c==u_L) &&
1058         ((c=msg.charAt(index++))==u_u || c==u_U) &&
1059         ((c=msg.charAt(index++))==u_r || c==u_R) &&
1060         ((c=msg.charAt(index++))==u_a || c==u_A) &&
1061         ((c=msg.charAt(index))==u_l || c==u_L);
1062 }
1063 
1064 UBool
isSelect(int32_t index)1065 MessagePattern::isSelect(int32_t index) {
1066     UChar c;
1067     return
1068         ((c=msg.charAt(index++))==u_s || c==u_S) &&
1069         ((c=msg.charAt(index++))==u_e || c==u_E) &&
1070         ((c=msg.charAt(index++))==u_l || c==u_L) &&
1071         ((c=msg.charAt(index++))==u_e || c==u_E) &&
1072         ((c=msg.charAt(index++))==u_c || c==u_C) &&
1073         ((c=msg.charAt(index))==u_t || c==u_T);
1074 }
1075 
1076 UBool
isOrdinal(int32_t index)1077 MessagePattern::isOrdinal(int32_t index) {
1078     UChar c;
1079     return
1080         ((c=msg.charAt(index++))==u_o || c==u_O) &&
1081         ((c=msg.charAt(index++))==u_r || c==u_R) &&
1082         ((c=msg.charAt(index++))==u_d || c==u_D) &&
1083         ((c=msg.charAt(index++))==u_i || c==u_I) &&
1084         ((c=msg.charAt(index++))==u_n || c==u_N) &&
1085         ((c=msg.charAt(index++))==u_a || c==u_A) &&
1086         ((c=msg.charAt(index))==u_l || c==u_L);
1087 }
1088 
1089 UBool
inMessageFormatPattern(int32_t nestingLevel)1090 MessagePattern::inMessageFormatPattern(int32_t nestingLevel) {
1091     return nestingLevel>0 || partsList->a[0].type==UMSGPAT_PART_TYPE_MSG_START;
1092 }
1093 
1094 UBool
inTopLevelChoiceMessage(int32_t nestingLevel,UMessagePatternArgType parentType)1095 MessagePattern::inTopLevelChoiceMessage(int32_t nestingLevel, UMessagePatternArgType parentType) {
1096     return
1097         nestingLevel==1 &&
1098         parentType==UMSGPAT_ARG_TYPE_CHOICE &&
1099         partsList->a[0].type!=UMSGPAT_PART_TYPE_MSG_START;
1100 }
1101 
1102 void
addPart(UMessagePatternPartType type,int32_t index,int32_t length,int32_t value,UErrorCode & errorCode)1103 MessagePattern::addPart(UMessagePatternPartType type, int32_t index, int32_t length,
1104                         int32_t value, UErrorCode &errorCode) {
1105     if(partsList->ensureCapacityForOneMore(partsLength, errorCode)) {
1106         Part &part=partsList->a[partsLength++];
1107         part.type=type;
1108         part.index=index;
1109         part.length=(uint16_t)length;
1110         part.value=(int16_t)value;
1111         part.limitPartIndex=0;
1112     }
1113 }
1114 
1115 void
addLimitPart(int32_t start,UMessagePatternPartType type,int32_t index,int32_t length,int32_t value,UErrorCode & errorCode)1116 MessagePattern::addLimitPart(int32_t start,
1117                              UMessagePatternPartType type, int32_t index, int32_t length,
1118                              int32_t value, UErrorCode &errorCode) {
1119     partsList->a[start].limitPartIndex=partsLength;
1120     addPart(type, index, length, value, errorCode);
1121 }
1122 
1123 void
addArgDoublePart(double numericValue,int32_t start,int32_t length,UErrorCode & errorCode)1124 MessagePattern::addArgDoublePart(double numericValue, int32_t start, int32_t length,
1125                                  UErrorCode &errorCode) {
1126     if(U_FAILURE(errorCode)) {
1127         return;
1128     }
1129     int32_t numericIndex=numericValuesLength;
1130     if(numericValuesList==NULL) {
1131         numericValuesList=new MessagePatternDoubleList();
1132         if(numericValuesList==NULL) {
1133             errorCode=U_MEMORY_ALLOCATION_ERROR;
1134             return;
1135         }
1136     } else if(!numericValuesList->ensureCapacityForOneMore(numericValuesLength, errorCode)) {
1137         return;
1138     } else {
1139         if(numericIndex>Part::MAX_VALUE) {
1140             errorCode=U_INDEX_OUTOFBOUNDS_ERROR;
1141             return;
1142         }
1143     }
1144     numericValuesList->a[numericValuesLength++]=numericValue;
1145     addPart(UMSGPAT_PART_TYPE_ARG_DOUBLE, start, length, numericIndex, errorCode);
1146 }
1147 
1148 void
setParseError(UParseError * parseError,int32_t index)1149 MessagePattern::setParseError(UParseError *parseError, int32_t index) {
1150     if(parseError==NULL) {
1151         return;
1152     }
1153     parseError->offset=index;
1154 
1155     // Set preContext to some of msg before index.
1156     // Avoid splitting a surrogate pair.
1157     int32_t length=index;
1158     if(length>=U_PARSE_CONTEXT_LEN) {
1159         length=U_PARSE_CONTEXT_LEN-1;
1160         if(length>0 && U16_IS_TRAIL(msg[index-length])) {
1161             --length;
1162         }
1163     }
1164     msg.extract(index-length, length, parseError->preContext);
1165     parseError->preContext[length]=0;
1166 
1167     // Set postContext to some of msg starting at index.
1168     length=msg.length()-index;
1169     if(length>=U_PARSE_CONTEXT_LEN) {
1170         length=U_PARSE_CONTEXT_LEN-1;
1171         if(length>0 && U16_IS_LEAD(msg[index+length-1])) {
1172             --length;
1173         }
1174     }
1175     msg.extract(index, length, parseError->postContext);
1176     parseError->postContext[length]=0;
1177 }
1178 
1179 // MessageImpl ------------------------------------------------------------- ***
1180 
1181 void
appendReducedApostrophes(const UnicodeString & s,int32_t start,int32_t limit,UnicodeString & sb)1182 MessageImpl::appendReducedApostrophes(const UnicodeString &s, int32_t start, int32_t limit,
1183                                       UnicodeString &sb) {
1184     int32_t doubleApos=-1;
1185     for(;;) {
1186         int32_t i=s.indexOf(u_apos, start);
1187         if(i<0 || i>=limit) {
1188             sb.append(s, start, limit-start);
1189             break;
1190         }
1191         if(i==doubleApos) {
1192             // Double apostrophe at start-1 and start==i, append one.
1193             sb.append(u_apos);
1194             ++start;
1195             doubleApos=-1;
1196         } else {
1197             // Append text between apostrophes and skip this one.
1198             sb.append(s, start, i-start);
1199             doubleApos=start=i+1;
1200         }
1201     }
1202 }
1203 
1204 // Ported from second half of ICU4J SelectFormat.format(String).
1205 UnicodeString &
appendSubMessageWithoutSkipSyntax(const MessagePattern & msgPattern,int32_t msgStart,UnicodeString & result)1206 MessageImpl::appendSubMessageWithoutSkipSyntax(const MessagePattern &msgPattern,
1207                                                int32_t msgStart,
1208                                                UnicodeString &result) {
1209     const UnicodeString &msgString=msgPattern.getPatternString();
1210     int32_t prevIndex=msgPattern.getPart(msgStart).getLimit();
1211     for(int32_t i=msgStart;;) {
1212         const MessagePattern::Part &part=msgPattern.getPart(++i);
1213         UMessagePatternPartType type=part.getType();
1214         int32_t index=part.getIndex();
1215         if(type==UMSGPAT_PART_TYPE_MSG_LIMIT) {
1216             return result.append(msgString, prevIndex, index-prevIndex);
1217         } else if(type==UMSGPAT_PART_TYPE_SKIP_SYNTAX) {
1218             result.append(msgString, prevIndex, index-prevIndex);
1219             prevIndex=part.getLimit();
1220         } else if(type==UMSGPAT_PART_TYPE_ARG_START) {
1221             result.append(msgString, prevIndex, index-prevIndex);
1222             prevIndex=index;
1223             i=msgPattern.getLimitPartIndex(i);
1224             index=msgPattern.getPart(i).getLimit();
1225             appendReducedApostrophes(msgString, prevIndex, index, result);
1226             prevIndex=index;
1227         }
1228     }
1229 }
1230 
1231 U_NAMESPACE_END
1232 
1233 #endif  // !UCONFIG_NO_FORMATTING
1234