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(UNumberGroupingStrategy 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         UPRV_UNREACHABLE;
  51     }
  52 }
  53
  54 Grouper Grouper::forProperties(const DecimalFormatProperties& properties) {
  55     if (!properties.groupingUsed) {
  56         return forStrategy(UNUM_GROUPING_OFF);
  57     }
  58     auto grouping1 = static_cast<int16_t>(properties.groupingSize);
  59     auto grouping2 = static_cast<int16_t>(properties.secondaryGroupingSize);
  60     auto minGrouping = static_cast<int16_t>(properties.minimumGroupingDigits);
  61     grouping1 = grouping1 > 0 ? grouping1 : grouping2 > 0 ? grouping2 : grouping1;
  62     grouping2 = grouping2 > 0 ? grouping2 : grouping1;
  63     minGrouping = minGrouping > 0 ? minGrouping : -2; // use locale data if not set <rdar://problem/49808819>
  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         if (fMinGrouping == -2) { // add test <rdar://problem/49808819>
  70             fMinGrouping = getMinGroupingForLocale(locale);
  71         }
  72         return;
  73     }
  74     auto grouping1 = static_cast<int16_t> (patternInfo.positive.groupingSizes & 0xffff);
  75     auto grouping2 = static_cast<int16_t> ((patternInfo.positive.groupingSizes >> 16) & 0xffff);
  76     auto grouping3 = static_cast<int16_t> ((patternInfo.positive.groupingSizes >> 32) & 0xffff);
  77     if (grouping2 == -1) {
  78         grouping1 = fGrouping1 == -4 ? (short) 3 : (short) -1;
  79     }
  80     if (grouping3 == -1) {
  81         grouping2 = grouping1;
  82     }
  83     if (fMinGrouping == -2) {
  84         fMinGrouping = getMinGroupingForLocale(locale);
  85     } else if (fMinGrouping == -3) {
  86         fMinGrouping = static_cast<int16_t>(uprv_max(2, getMinGroupingForLocale(locale)));
  87     } else {
  88         // leave fMinGrouping alone
  89     }
  90     fGrouping1 = grouping1;
  91     fGrouping2 = grouping2;
  92 }
  93
  94 bool Grouper::groupAtPosition(int32_t position, const impl::DecimalQuantity &value) const {
  95     U_ASSERT(fGrouping1 > -2);
  96     if (fGrouping1 == -1 || fGrouping1 == 0) {
  97         // Either -1 or 0 means "no grouping"
  98         return false;
  99     }
 100     position -= fGrouping1;
 101     return position >= 0 && (position % fGrouping2) == 0
 102            && value.getUpperDisplayMagnitude() - fGrouping1 + 1 >= fMinGrouping;
 103 }
 104
 105 int16_t Grouper::getPrimary() const {
 106     return fGrouping1;
 107 }
 108
 109 int16_t Grouper::getSecondary() const {
 110     return fGrouping2;
 111 }
 112
 113 #endif /* #if !UCONFIG_NO_FORMATTING */