summaryrefslogtreecommitdiffstats
path: root/intl/icu/source/i18n/choicfmt.cpp
blob: f6e36a6b4898b66573d3de88c2918d3c9c7ee2ee (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
// Copyright (C) 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
*******************************************************************************
* Copyright (C) 1997-2013, International Business Machines Corporation and    *
* others. All Rights Reserved.                                                *
*******************************************************************************
*
* File CHOICFMT.CPP
*
* Modification History:
*
*   Date        Name        Description
*   02/19/97    aliu        Converted from java.
*   03/20/97    helena      Finished first cut of implementation and got rid 
*                           of nextDouble/previousDouble and replaced with
*                           boolean array.
*   4/10/97     aliu        Clean up.  Modified to work on AIX.
*   06/04/97    helena      Fixed applyPattern(), toPattern() and not to include 
*                           wchar.h.
*   07/09/97    helena      Made ParsePosition into a class.
*   08/06/97    nos         removed overloaded constructor, fixed 'format(array)'
*   07/22/98    stephen     JDK 1.2 Sync - removed UBool array (doubleFlags)
*   02/22/99    stephen     Removed character literals for EBCDIC safety
********************************************************************************
*/

#include "unicode/utypes.h"

#if !UCONFIG_NO_FORMATTING

#include "unicode/choicfmt.h"
#include "unicode/numfmt.h"
#include "unicode/locid.h"
#include "cpputils.h"
#include "cstring.h"
#include "messageimpl.h"
#include "putilimp.h"
#include "uassert.h"
#include <stdio.h>
#include <float.h>

// *****************************************************************************
// class ChoiceFormat
// *****************************************************************************

U_NAMESPACE_BEGIN

UOBJECT_DEFINE_RTTI_IMPLEMENTATION(ChoiceFormat)

// Special characters used by ChoiceFormat.  There are two characters
// used interchangeably to indicate <=.  Either is parsed, but only
// LESS_EQUAL is generated by toPattern().
#define SINGLE_QUOTE ((UChar)0x0027)   /*'*/
#define LESS_THAN    ((UChar)0x003C)   /*<*/
#define LESS_EQUAL   ((UChar)0x0023)   /*#*/
#define LESS_EQUAL2  ((UChar)0x2264)
#define VERTICAL_BAR ((UChar)0x007C)   /*|*/
#define MINUS        ((UChar)0x002D)   /*-*/

static const UChar LEFT_CURLY_BRACE = 0x7B;     /*{*/
static const UChar RIGHT_CURLY_BRACE = 0x7D;    /*}*/

#ifdef INFINITY
#undef INFINITY
#endif
#define INFINITY     ((UChar)0x221E)

//static const UChar gPositiveInfinity[] = {INFINITY, 0};
//static const UChar gNegativeInfinity[] = {MINUS, INFINITY, 0};
#define POSITIVE_INF_STRLEN 1
#define NEGATIVE_INF_STRLEN 2

// -------------------------------------
// Creates a ChoiceFormat instance based on the pattern.

ChoiceFormat::ChoiceFormat(const UnicodeString& newPattern,
                           UErrorCode& status)
: constructorErrorCode(status),
  msgPattern(status)
{
    applyPattern(newPattern, status);
}

// -------------------------------------
// Creates a ChoiceFormat instance with the limit array and 
// format strings for each limit.

ChoiceFormat::ChoiceFormat(const double* limits, 
                           const UnicodeString* formats, 
                           int32_t cnt )
: constructorErrorCode(U_ZERO_ERROR),
  msgPattern(constructorErrorCode)
{
    setChoices(limits, NULL, formats, cnt, constructorErrorCode);
}

// -------------------------------------

ChoiceFormat::ChoiceFormat(const double* limits, 
                           const UBool* closures,
                           const UnicodeString* formats, 
                           int32_t cnt )
: constructorErrorCode(U_ZERO_ERROR),
  msgPattern(constructorErrorCode)
{
    setChoices(limits, closures, formats, cnt, constructorErrorCode);
}

// -------------------------------------
// copy constructor

ChoiceFormat::ChoiceFormat(const    ChoiceFormat&   that) 
: NumberFormat(that),
  constructorErrorCode(that.constructorErrorCode),
  msgPattern(that.msgPattern)
{
}

// -------------------------------------
// Private constructor that creates a 
// ChoiceFormat instance based on the 
// pattern and populates UParseError

ChoiceFormat::ChoiceFormat(const UnicodeString& newPattern,
                           UParseError& parseError,
                           UErrorCode& status)
: constructorErrorCode(status),
  msgPattern(status)
{
    applyPattern(newPattern,parseError, status);
}
// -------------------------------------

UBool
ChoiceFormat::operator==(const Format& that) const
{
    if (this == &that) return TRUE;
    if (!NumberFormat::operator==(that)) return FALSE;
    ChoiceFormat& thatAlias = (ChoiceFormat&)that;
    return msgPattern == thatAlias.msgPattern;
}

// -------------------------------------
// copy constructor

const ChoiceFormat&
ChoiceFormat::operator=(const   ChoiceFormat& that)
{
    if (this != &that) {
        NumberFormat::operator=(that);
        constructorErrorCode = that.constructorErrorCode;
        msgPattern = that.msgPattern;
    }
    return *this;
}

// -------------------------------------

ChoiceFormat::~ChoiceFormat()
{
}

// -------------------------------------

/**
 * Convert a double value to a string without the overhead of NumberFormat.
 */
UnicodeString&
ChoiceFormat::dtos(double value,
                   UnicodeString& string)
{
    /* Buffer to contain the digits and any extra formatting stuff. */
    char temp[DBL_DIG + 16];
    char *itrPtr = temp;
    char *expPtr;

    sprintf(temp, "%.*g", DBL_DIG, value);

    /* Find and convert the decimal point.
       Using setlocale on some machines will cause sprintf to use a comma for certain locales.
    */
    while (*itrPtr && (*itrPtr == '-' || isdigit(*itrPtr))) {
        itrPtr++;
    }
    if (*itrPtr != 0 && *itrPtr != 'e') {
        /* We reached something that looks like a decimal point.
        In case someone used setlocale(), which changes the decimal point. */
        *itrPtr = '.';
        itrPtr++;
    }
    /* Search for the exponent */
    while (*itrPtr && *itrPtr != 'e') {
        itrPtr++;
    }
    if (*itrPtr == 'e') {
        itrPtr++;
        /* Verify the exponent sign */
        if (*itrPtr == '+' || *itrPtr == '-') {
            itrPtr++;
        }
        /* Remove leading zeros. You will see this on Windows machines. */
        expPtr = itrPtr;
        while (*itrPtr == '0') {
            itrPtr++;
        }
        if (*itrPtr && expPtr != itrPtr) {
            /* Shift the exponent without zeros. */
            while (*itrPtr) {
                *(expPtr++)  = *(itrPtr++);
            }
            // NULL terminate
            *expPtr = 0;
        }
    }

    string = UnicodeString(temp, -1, US_INV);    /* invariant codepage */
    return string;
}

// -------------------------------------
// calls the overloaded applyPattern method.

void
ChoiceFormat::applyPattern(const UnicodeString& pattern,
                           UErrorCode& status)
{
    msgPattern.parseChoiceStyle(pattern, NULL, status);
    constructorErrorCode = status;
}

// -------------------------------------
// Applies the pattern to this ChoiceFormat instance.

void
ChoiceFormat::applyPattern(const UnicodeString& pattern,
                           UParseError& parseError,
                           UErrorCode& status)
{
    msgPattern.parseChoiceStyle(pattern, &parseError, status);
    constructorErrorCode = status;
}
// -------------------------------------
// Returns the input pattern string.

UnicodeString&
ChoiceFormat::toPattern(UnicodeString& result) const
{
    return result = msgPattern.getPatternString();
}

// -------------------------------------
// Sets the limit and format arrays. 
void
ChoiceFormat::setChoices(  const double* limits, 
                           const UnicodeString* formats, 
                           int32_t cnt )
{
    UErrorCode errorCode = U_ZERO_ERROR;
    setChoices(limits, NULL, formats, cnt, errorCode);
}

// -------------------------------------
// Sets the limit and format arrays. 
void
ChoiceFormat::setChoices(  const double* limits, 
                           const UBool* closures,
                           const UnicodeString* formats, 
                           int32_t cnt )
{
    UErrorCode errorCode = U_ZERO_ERROR;
    setChoices(limits, closures, formats, cnt, errorCode);
}

void
ChoiceFormat::setChoices(const double* limits,
                         const UBool* closures,
                         const UnicodeString* formats,
                         int32_t count,
                         UErrorCode &errorCode) {
    if (U_FAILURE(errorCode)) {
        return;
    }
    if (limits == NULL || formats == NULL) {
        errorCode = U_ILLEGAL_ARGUMENT_ERROR;
        return;
    }
    // Reconstruct the original input pattern.
    // Modified version of the pre-ICU 4.8 toPattern() implementation.
    UnicodeString result;
    for (int32_t i = 0; i < count; ++i) {
        if (i != 0) {
            result += VERTICAL_BAR;
        }
        UnicodeString buf;
        if (uprv_isPositiveInfinity(limits[i])) {
            result += INFINITY;
        } else if (uprv_isNegativeInfinity(limits[i])) {
            result += MINUS;
            result += INFINITY;
        } else {
            result += dtos(limits[i], buf);
        }
        if (closures != NULL && closures[i]) {
            result += LESS_THAN;
        } else {
            result += LESS_EQUAL;
        }
        // Append formats[i], using quotes if there are special
        // characters.  Single quotes themselves must be escaped in
        // either case.
        const UnicodeString& text = formats[i];
        int32_t textLength = text.length();
        int32_t nestingLevel = 0;
        for (int32_t j = 0; j < textLength; ++j) {
            UChar c = text[j];
            if (c == SINGLE_QUOTE && nestingLevel == 0) {
                // Double each top-level apostrophe.
                result.append(c);
            } else if (c == VERTICAL_BAR && nestingLevel == 0) {
                // Surround each pipe symbol with apostrophes for quoting.
                // If the next character is an apostrophe, then that will be doubled,
                // and although the parser will see the apostrophe pairs beginning
                // and ending one character earlier than our doubling, the result
                // is as desired.
                //   | -> '|'
                //   |' -> '|'''
                //   |'' -> '|''''' etc.
                result.append(SINGLE_QUOTE).append(c).append(SINGLE_QUOTE);
                continue;  // Skip the append(c) at the end of the loop body.
            } else if (c == LEFT_CURLY_BRACE) {
                ++nestingLevel;
            } else if (c == RIGHT_CURLY_BRACE && nestingLevel > 0) {
                --nestingLevel;
            }
            result.append(c);
        }
    }
    // Apply the reconstructed pattern.
    applyPattern(result, errorCode);
}

// -------------------------------------
// Gets the limit array.

const double*
ChoiceFormat::getLimits(int32_t& cnt) const 
{
    cnt = 0;
    return NULL;
}

// -------------------------------------
// Gets the closures array.

const UBool*
ChoiceFormat::getClosures(int32_t& cnt) const 
{
    cnt = 0;
    return NULL;
}

// -------------------------------------
// Gets the format array.

const UnicodeString*
ChoiceFormat::getFormats(int32_t& cnt) const
{
    cnt = 0;
    return NULL;
}

// -------------------------------------
// Formats an int64 number, it's actually formatted as
// a double.  The returned format string may differ
// from the input number because of this.

UnicodeString&
ChoiceFormat::format(int64_t number, 
                     UnicodeString& appendTo, 
                     FieldPosition& status) const
{
    return format((double) number, appendTo, status);
}

// -------------------------------------
// Formats an int32_t number, it's actually formatted as
// a double.

UnicodeString&
ChoiceFormat::format(int32_t number, 
                     UnicodeString& appendTo, 
                     FieldPosition& status) const
{
    return format((double) number, appendTo, status);
}

// -------------------------------------
// Formats a double number.

UnicodeString&
ChoiceFormat::format(double number, 
                     UnicodeString& appendTo, 
                     FieldPosition& /*pos*/) const
{
    if (msgPattern.countParts() == 0) {
        // No pattern was applied, or it failed.
        return appendTo;
    }
    // Get the appropriate sub-message.
    int32_t msgStart = findSubMessage(msgPattern, 0, number);
    if (!MessageImpl::jdkAposMode(msgPattern)) {
        int32_t patternStart = msgPattern.getPart(msgStart).getLimit();
        int32_t msgLimit = msgPattern.getLimitPartIndex(msgStart);
        appendTo.append(msgPattern.getPatternString(),
                        patternStart,
                        msgPattern.getPatternIndex(msgLimit) - patternStart);
        return appendTo;
    }
    // JDK compatibility mode: Remove SKIP_SYNTAX.
    return MessageImpl::appendSubMessageWithoutSkipSyntax(msgPattern, msgStart, appendTo);
}

int32_t
ChoiceFormat::findSubMessage(const MessagePattern &pattern, int32_t partIndex, double number) {
    int32_t count = pattern.countParts();
    int32_t msgStart;
    // Iterate over (ARG_INT|DOUBLE, ARG_SELECTOR, message) tuples
    // until ARG_LIMIT or end of choice-only pattern.
    // Ignore the first number and selector and start the loop on the first message.
    partIndex += 2;
    for (;;) {
        // Skip but remember the current sub-message.
        msgStart = partIndex;
        partIndex = pattern.getLimitPartIndex(partIndex);
        if (++partIndex >= count) {
            // Reached the end of the choice-only pattern.
            // Return with the last sub-message.
            break;
        }
        const MessagePattern::Part &part = pattern.getPart(partIndex++);
        UMessagePatternPartType type = part.getType();
        if (type == UMSGPAT_PART_TYPE_ARG_LIMIT) {
            // Reached the end of the ChoiceFormat style.
            // Return with the last sub-message.
            break;
        }
        // part is an ARG_INT or ARG_DOUBLE
        U_ASSERT(MessagePattern::Part::hasNumericValue(type));
        double boundary = pattern.getNumericValue(part);
        // Fetch the ARG_SELECTOR character.
        int32_t selectorIndex = pattern.getPatternIndex(partIndex++);
        UChar boundaryChar = pattern.getPatternString().charAt(selectorIndex);
        if (boundaryChar == LESS_THAN ? !(number > boundary) : !(number >= boundary)) {
            // The number is in the interval between the previous boundary and the current one.
            // Return with the sub-message between them.
            // The !(a>b) and !(a>=b) comparisons are equivalent to
            // (a<=b) and (a<b) except they "catch" NaN.
            break;
        }
    }
    return msgStart;
}

// -------------------------------------
// Formats an array of objects. Checks if the data type of the objects
// to get the right value for formatting.  

UnicodeString&
ChoiceFormat::format(const Formattable* objs,
                     int32_t cnt,
                     UnicodeString& appendTo,
                     FieldPosition& pos,
                     UErrorCode& status) const
{
    if(cnt < 0) {
        status = U_ILLEGAL_ARGUMENT_ERROR;
        return appendTo;
    }
    if (msgPattern.countParts() == 0) {
        status = U_INVALID_STATE_ERROR;
        return appendTo;
    }

    for (int32_t i = 0; i < cnt; i++) {
        double objDouble = objs[i].getDouble(status);
        if (U_SUCCESS(status)) {
            format(objDouble, appendTo, pos);
        }
    }

    return appendTo;
}

// -------------------------------------

void
ChoiceFormat::parse(const UnicodeString& text, 
                    Formattable& result,
                    ParsePosition& pos) const
{
    result.setDouble(parseArgument(msgPattern, 0, text, pos));
}

double
ChoiceFormat::parseArgument(
        const MessagePattern &pattern, int32_t partIndex,
        const UnicodeString &source, ParsePosition &pos) {
    // find the best number (defined as the one with the longest parse)
    int32_t start = pos.getIndex();
    int32_t furthest = start;
    double bestNumber = uprv_getNaN();
    double tempNumber = 0.0;
    int32_t count = pattern.countParts();
    while (partIndex < count && pattern.getPartType(partIndex) != UMSGPAT_PART_TYPE_ARG_LIMIT) {
        tempNumber = pattern.getNumericValue(pattern.getPart(partIndex));
        partIndex += 2;  // skip the numeric part and ignore the ARG_SELECTOR
        int32_t msgLimit = pattern.getLimitPartIndex(partIndex);
        int32_t len = matchStringUntilLimitPart(pattern, partIndex, msgLimit, source, start);
        if (len >= 0) {
            int32_t newIndex = start + len;
            if (newIndex > furthest) {
                furthest = newIndex;
                bestNumber = tempNumber;
                if (furthest == source.length()) {
                    break;
                }
            }
        }
        partIndex = msgLimit + 1;
    }
    if (furthest == start) {
        pos.setErrorIndex(start);
    } else {
        pos.setIndex(furthest);
    }
    return bestNumber;
}

int32_t
ChoiceFormat::matchStringUntilLimitPart(
        const MessagePattern &pattern, int32_t partIndex, int32_t limitPartIndex,
        const UnicodeString &source, int32_t sourceOffset) {
    int32_t matchingSourceLength = 0;
    const UnicodeString &msgString = pattern.getPatternString();
    int32_t prevIndex = pattern.getPart(partIndex).getLimit();
    for (;;) {
        const MessagePattern::Part &part = pattern.getPart(++partIndex);
        if (partIndex == limitPartIndex || part.getType() == UMSGPAT_PART_TYPE_SKIP_SYNTAX) {
            int32_t index = part.getIndex();
            int32_t length = index - prevIndex;
            if (length != 0 && 0 != source.compare(sourceOffset, length, msgString, prevIndex, length)) {
                return -1;  // mismatch
            }
            matchingSourceLength += length;
            if (partIndex == limitPartIndex) {
                return matchingSourceLength;
            }
            prevIndex = part.getLimit();  // SKIP_SYNTAX
        }
    }
}

// -------------------------------------

Format*
ChoiceFormat::clone() const
{
    ChoiceFormat *aCopy = new ChoiceFormat(*this);
    return aCopy;
}

U_NAMESPACE_END

#endif /* #if !UCONFIG_NO_FORMATTING */

//eof