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base / i18n / number_formatting.cc [blame]
// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/i18n/number_formatting.h"
#include <stddef.h>
#include <memory>
#include "base/check.h"
#include "base/format_macros.h"
#include "base/i18n/message_formatter.h"
#include "base/i18n/unicodestring.h"
#include "base/lazy_instance.h"
#include "base/strings/string_util.h"
#include "base/strings/stringprintf.h"
#include "base/strings/utf_string_conversions.h"
#include "third_party/icu/source/common/unicode/ustring.h"
#include "third_party/icu/source/i18n/unicode/numfmt.h"
namespace base {
namespace {
// A simple wrapper around icu::NumberFormat that allows for resetting it
// (as LazyInstance does not).
struct NumberFormatWrapper {
NumberFormatWrapper() {
Reset();
}
void Reset() {
// There's no ICU call to destroy a NumberFormat object other than
// operator delete, so use the default Delete, which calls operator delete.
// This can cause problems if a different allocator is used by this file
// than by ICU.
UErrorCode status = U_ZERO_ERROR;
number_format.reset(icu::NumberFormat::createInstance(status));
DCHECK(U_SUCCESS(status));
}
std::unique_ptr<icu::NumberFormat> number_format;
};
LazyInstance<NumberFormatWrapper>::DestructorAtExit g_number_format_int =
LAZY_INSTANCE_INITIALIZER;
LazyInstance<NumberFormatWrapper>::DestructorAtExit g_number_format_float =
LAZY_INSTANCE_INITIALIZER;
} // namespace
std::u16string FormatNumber(int64_t number) {
icu::NumberFormat* number_format =
g_number_format_int.Get().number_format.get();
if (!number_format) {
// As a fallback, just return the raw number in a string.
return ASCIIToUTF16(StringPrintf("%" PRId64, number));
}
icu::UnicodeString ustr;
number_format->format(number, ustr);
return i18n::UnicodeStringToString16(ustr);
}
std::u16string FormatDouble(double number, int fractional_digits) {
return FormatDouble(number, fractional_digits, fractional_digits);
}
std::u16string FormatDouble(double number,
int min_fractional_digits,
int max_fractional_digits) {
icu::NumberFormat* number_format =
g_number_format_float.Get().number_format.get();
if (!number_format) {
// As a fallback, just return the raw number in a string.
return ASCIIToUTF16(StringPrintf("%f", number));
}
number_format->setMaximumFractionDigits(max_fractional_digits);
number_format->setMinimumFractionDigits(min_fractional_digits);
icu::UnicodeString ustr;
number_format->format(number, ustr);
return i18n::UnicodeStringToString16(ustr);
}
std::u16string FormatPercent(int number) {
return i18n::MessageFormatter::FormatWithNumberedArgs(
u"{0,number,percent}", static_cast<double>(number) / 100.0);
}
void ResetFormattersForTesting() {
g_number_format_int.Get().Reset();
g_number_format_float.Get().Reset();
}
} // namespace base