icuSources/i18n/number_grouping.cpp

   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 = 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 */