Layered component for web payments

components/payments/currency_formatter.h

-// Copyright 2017 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef COMPONENTS_PAYMENTS_CURRENCY_FORMATTER_H_
-#define COMPONENTS_PAYMENTS_CURRENCY_FORMATTER_H_
-
-#include <memory>
-#include <string>
-
-#include "base/macros.h"
-#include "base/optional.h"
-#include "base/strings/string16.h"
-#include "third_party/icu/source/common/unicode/locid.h"
-#include "third_party/icu/source/i18n/unicode/numfmt.h"
-
-namespace payments {
-
-// URI specifying the ISO4217 currency code specification. See for details:
-// https://w3c.github.io/browser-payment-api/#paymentcurrencyamount-dictionary
-extern const char kIso4217CurrencySystem[];
-
-// Currency formatter for amounts, according to a currency code, which typically
-// adheres to [ISO4217] (for example, "USD" for US Dollars).
-class CurrencyFormatter {
- public:
-  // Initializes the CurrencyFormatter for a given |currency_code|,
-  // |currency_system| and |locale_name|. Note that |currency_code| and
-  // |currency_system| should have been validated (as part of
-  // payment_details_validation.h) before this is created.
-  CurrencyFormatter(const std::string& currency_code,
-                    const std::string& currency_system,
-                    const std::string& locale_name);
-  ~CurrencyFormatter();
-
-  // Formats the |amount| according to the currency code that was set. The
-  // result will NOT contain the currency code, nor a subset of it. Rather, the
-  // caller of this function should display the currency code separately. The
-  // return value may contain non-breaking space and is ready for display. In
-  // the case of a failure in initialization of the formatter or during
-  // formatter, this method will return |amount|.
-  base::string16 Format(const std::string& amount);
-
-  // Returns the formatted currency code (<= 6 characters including ellipsis if
-  // applicable).
-  std::string formatted_currency_code() { return formatted_currency_code_; }
-
- private:
-  const icu::Locale locale_;
-  std::unique_ptr<icu::UnicodeString> currency_code_;
-  std::string formatted_currency_code_;
-  std::unique_ptr<icu::NumberFormat> icu_formatter_;
-
-  DISALLOW_COPY_AND_ASSIGN(CurrencyFormatter);
-};
-
-}  // namespace payments
-
-#endif  // COMPONENTS_PAYMENTS_CURRENCY_FORMATTER_H_