94 lines
2.7 KiB
C++
94 lines
2.7 KiB
C++
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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/i18n/number_formatting.h"
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#include <stddef.h>
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#include <memory>
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#include "base/format_macros.h"
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#include "base/i18n/message_formatter.h"
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#include "base/i18n/unicodestring.h"
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#include "base/lazy_instance.h"
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#include "base/logging.h"
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#include "base/strings/string_util.h"
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#include "base/strings/stringprintf.h"
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#include "base/strings/utf_string_conversions.h"
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#include "third_party/icu/source/common/unicode/ustring.h"
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#include "third_party/icu/source/i18n/unicode/numfmt.h"
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namespace base {
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namespace {
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// A simple wrapper around icu::NumberFormat that allows for resetting it
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// (as LazyInstance does not).
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struct NumberFormatWrapper {
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NumberFormatWrapper() {
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Reset();
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}
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void Reset() {
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// There's no ICU call to destroy a NumberFormat object other than
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// operator delete, so use the default Delete, which calls operator delete.
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// This can cause problems if a different allocator is used by this file
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// than by ICU.
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UErrorCode status = U_ZERO_ERROR;
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number_format.reset(icu::NumberFormat::createInstance(status));
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DCHECK(U_SUCCESS(status));
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}
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std::unique_ptr<icu::NumberFormat> number_format;
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};
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LazyInstance<NumberFormatWrapper>::DestructorAtExit g_number_format_int =
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LAZY_INSTANCE_INITIALIZER;
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LazyInstance<NumberFormatWrapper>::DestructorAtExit g_number_format_float =
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LAZY_INSTANCE_INITIALIZER;
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} // namespace
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string16 FormatNumber(int64_t number) {
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icu::NumberFormat* number_format =
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g_number_format_int.Get().number_format.get();
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if (!number_format) {
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// As a fallback, just return the raw number in a string.
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return ASCIIToUTF16(StringPrintf("%" PRId64, number));
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}
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icu::UnicodeString ustr;
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number_format->format(number, ustr);
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return i18n::UnicodeStringToString16(ustr);
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}
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string16 FormatDouble(double number, int fractional_digits) {
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icu::NumberFormat* number_format =
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g_number_format_float.Get().number_format.get();
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if (!number_format) {
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// As a fallback, just return the raw number in a string.
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return ASCIIToUTF16(StringPrintf("%f", number));
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}
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number_format->setMaximumFractionDigits(fractional_digits);
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number_format->setMinimumFractionDigits(fractional_digits);
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icu::UnicodeString ustr;
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number_format->format(number, ustr);
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return i18n::UnicodeStringToString16(ustr);
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}
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string16 FormatPercent(int number) {
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return i18n::MessageFormatter::FormatWithNumberedArgs(
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ASCIIToUTF16("{0,number,percent}"), static_cast<double>(number) / 100.0);
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}
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void ResetFormattersForTesting() {
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g_number_format_int.Get().Reset();
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g_number_format_float.Get().Reset();
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}
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} // namespace base
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