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      1 //  2017 and later: Unicode, Inc. and others.
      2 // License & terms of use: http://www.unicode.org/copyright.html
      3 
      4 #include "unicode/utypes.h"
      5 
      6 #if !UCONFIG_NO_FORMATTING
      7 
      8 #include "unicode/numberformatter.h"
      9 #include "number_patternstring.h"
     10 #include "uresimp.h"
     11 
     12 using namespace icu;
     13 using namespace icu::number;
     14 using namespace icu::number::impl;
     15 
     16 namespace {
     17 
     18 int16_t getMinGroupingForLocale(const Locale& locale) {
     19     // TODO: Cache this?
     20     UErrorCode localStatus = U_ZERO_ERROR;
     21     LocalUResourceBundlePointer bundle(ures_open(NULL, locale.getName(), &localStatus));
     22     int32_t resultLen = 0;
     23     const char16_t* result = ures_getStringByKeyWithFallback(
     24         bundle.getAlias(),
     25         "NumberElements/minimumGroupingDigits",
     26         &resultLen,
     27         &localStatus);
     28     // TODO: Is it safe to assume resultLen == 1? Would locales set minGrouping >= 10?
     29     if (U_FAILURE(localStatus) || resultLen != 1) {
     30         return 1;
     31     }
     32     return result[0] - u'0';
     33 }
     34 
     35 }
     36 
     37 Grouper Grouper::forStrategy(UGroupingStrategy grouping) {
     38     switch (grouping) {
     39     case UNUM_GROUPING_OFF:
     40         return {-1, -1, -2, grouping};
     41     case UNUM_GROUPING_AUTO:
     42         return {-2, -2, -2, grouping};
     43     case UNUM_GROUPING_MIN2:
     44         return {-2, -2, -3, grouping};
     45     case UNUM_GROUPING_ON_ALIGNED:
     46         return {-4, -4, 1, grouping};
     47     case UNUM_GROUPING_THOUSANDS:
     48         return {3, 3, 1, grouping};
     49     default:
     50         U_ASSERT(FALSE);
     51         return {}; // return a value: silence compiler warning
     52     }
     53 }
     54 
     55 Grouper Grouper::forProperties(const DecimalFormatProperties& properties) {
     56     if (!properties.groupingUsed) {
     57         return forStrategy(UNUM_GROUPING_OFF);
     58     }
     59     auto grouping1 = static_cast<int16_t>(properties.groupingSize);
     60     auto grouping2 = static_cast<int16_t>(properties.secondaryGroupingSize);
     61     auto minGrouping = static_cast<int16_t>(properties.minimumGroupingDigits);
     62     grouping1 = grouping1 > 0 ? grouping1 : grouping2 > 0 ? grouping2 : grouping1;
     63     grouping2 = grouping2 > 0 ? grouping2 : grouping1;
     64     return {grouping1, grouping2, minGrouping, UNUM_GROUPING_COUNT};
     65 }
     66 
     67 void Grouper::setLocaleData(const impl::ParsedPatternInfo &patternInfo, const Locale& locale) {
     68     if (fGrouping1 != -2 && fGrouping2 != -4) {
     69         return;
     70     }
     71     auto grouping1 = static_cast<int16_t> (patternInfo.positive.groupingSizes & 0xffff);
     72     auto grouping2 = static_cast<int16_t> ((patternInfo.positive.groupingSizes >> 16) & 0xffff);
     73     auto grouping3 = static_cast<int16_t> ((patternInfo.positive.groupingSizes >> 32) & 0xffff);
     74     if (grouping2 == -1) {
     75         grouping1 = fGrouping1 == -4 ? (short) 3 : (short) -1;
     76     }
     77     if (grouping3 == -1) {
     78         grouping2 = grouping1;
     79     }
     80     if (fMinGrouping == -2) {
     81         fMinGrouping = getMinGroupingForLocale(locale);
     82     } else if (fMinGrouping == -3) {
     83         fMinGrouping = static_cast<int16_t>(uprv_max(2, getMinGroupingForLocale(locale)));
     84     } else {
     85         // leave fMinGrouping alone
     86     }
     87     fGrouping1 = grouping1;
     88     fGrouping2 = grouping2;
     89 }
     90 
     91 bool Grouper::groupAtPosition(int32_t position, const impl::DecimalQuantity &value) const {
     92     U_ASSERT(fGrouping1 > -2);
     93     if (fGrouping1 == -1 || fGrouping1 == 0) {
     94         // Either -1 or 0 means "no grouping"
     95         return false;
     96     }
     97     position -= fGrouping1;
     98     return position >= 0 && (position % fGrouping2) == 0
     99            && value.getUpperDisplayMagnitude() - fGrouping1 + 1 >= fMinGrouping;
    100 }
    101 
    102 int16_t Grouper::getPrimary() const {
    103     return fGrouping1;
    104 }
    105 
    106 int16_t Grouper::getSecondary() const {
    107     return fGrouping2;
    108 }
    109 
    110 #endif /* #if !UCONFIG_NO_FORMATTING */
    111