ICU msg format support with more than one arguments

base/i18n/message_formatter.cc

Index: base/i18n/message_formatter.cc
diff --git a/base/i18n/message_formatter.cc b/base/i18n/message_formatter.cc
new file mode 100644
index 0000000000000000000000000000000000000000..702e51b94aaaf2eb30f3c9364daa6fbb8f84bc0c
--- /dev/null
+++ b/base/i18n/message_formatter.cc
@@ -0,0 +1,141 @@
+// Copyright 2015 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.
+
+#include "base/i18n/message_formatter.h"
+
+#include "base/logging.h"
+#include "base/numerics/safe_conversions.h"
+#include "base/time/time.h"
+#include "third_party/icu/source/common/unicode/unistr.h"
+#include "third_party/icu/source/common/unicode/utypes.h"
+#include "third_party/icu/source/i18n/unicode/fmtable.h"
+#include "third_party/icu/source/i18n/unicode/msgfmt.h"
+
+using icu::UnicodeString;
+
+namespace base {
+namespace i18n {
+namespace {
+UnicodeString UnicodeStringFromStringPiece(StringPiece str) {
+  return UnicodeString::fromUTF8(
+      icu::StringPiece(str.data(), base::checked_cast<int32_t>(str.size())));
+}
+}  // anonymous namespace
+
+namespace internal {
+MessageArg::MessageArg() : formattable(nullptr) {}
+
+MessageArg::MessageArg(const char* s)
+    : formattable(new icu::Formattable(UnicodeStringFromStringPiece(s))) {}
+
+MessageArg::MessageArg(StringPiece s)
+    : formattable(new icu::Formattable(UnicodeStringFromStringPiece(s))) {}
+
+MessageArg::MessageArg(const std::string& s)
+    : formattable(new icu::Formattable(UnicodeString::fromUTF8(s))) {}
+
+MessageArg::MessageArg(const string16& s)
+    : formattable(new icu::Formattable(UnicodeString(s.data(), s.size()))) {}
+
+MessageArg::MessageArg(int i) : formattable(new icu::Formattable(i)) {}
+
+MessageArg::MessageArg(int64_t i) : formattable(new icu::Formattable(i)) {}
+
+MessageArg::MessageArg(double d) : formattable(new icu::Formattable(d)) {}
+
+MessageArg::MessageArg(const Time& t)
+    : formattable(new icu::Formattable(static_cast<UDate>(t.ToJsTime()))) {}
+
+MessageArg::~MessageArg() {}
+
+// Tests if this argument has a value, and if so increments *count.
+bool MessageArg::has_value(int *count) const {
+  if (formattable == nullptr)
+    return false;
+
+  ++*count;
+  return true;
+}
+
+}  // namespace internal
+
+string16 MessageFormatter::FormatWithNumberedArgs(
+    StringPiece16 msg,
+    const internal::MessageArg& arg0,
+    const internal::MessageArg& arg1,
+    const internal::MessageArg& arg2,
+    const internal::MessageArg& arg3,
+    const internal::MessageArg& arg4,
+    const internal::MessageArg& arg5,
+    const internal::MessageArg& arg6) {
+  int32_t args_count = 0;
+  icu::Formattable args[] = {
+      arg0.has_value(&args_count) ? *arg0.formattable : icu::Formattable(),
+      arg1.has_value(&args_count) ? *arg1.formattable : icu::Formattable(),
+      arg2.has_value(&args_count) ? *arg2.formattable : icu::Formattable(),
+      arg3.has_value(&args_count) ? *arg3.formattable : icu::Formattable(),
+      arg4.has_value(&args_count) ? *arg4.formattable : icu::Formattable(),
+      arg5.has_value(&args_count) ? *arg5.formattable : icu::Formattable(),
+      arg6.has_value(&args_count) ? *arg6.formattable : icu::Formattable(),
+  };
+
+  UnicodeString msg_string(msg.data(), msg.size());
+  UErrorCode error = U_ZERO_ERROR;
+  icu::MessageFormat format(msg_string,  error);
+  icu::UnicodeString formatted;
+  icu::FieldPosition ignore(icu::FieldPosition::DONT_CARE);
+  format.format(args, args_count, formatted, ignore, error);
+  if (U_FAILURE(error)) {
+    LOG(ERROR) << "MessageFormat(" << msg.as_string() << ") failed with "
+               << u_errorName(error);
+    return string16();
+  }
+  return string16(formatted.getBuffer(), formatted.length());
+}
+
+string16 MessageFormatter::FormatWithNamedArgs(
+    StringPiece16 msg,
+    StringPiece name0, const internal::MessageArg& arg0,
+    StringPiece name1, const internal::MessageArg& arg1,
+    StringPiece name2, const internal::MessageArg& arg2,
+    StringPiece name3, const internal::MessageArg& arg3,
+    StringPiece name4, const internal::MessageArg& arg4,
+    StringPiece name5, const internal::MessageArg& arg5,
+    StringPiece name6, const internal::MessageArg& arg6) {
+  icu::UnicodeString names[] = {
+      UnicodeStringFromStringPiece(name0),
+      UnicodeStringFromStringPiece(name1),
+      UnicodeStringFromStringPiece(name2),
+      UnicodeStringFromStringPiece(name3),
+      UnicodeStringFromStringPiece(name4),
+      UnicodeStringFromStringPiece(name5),
+      UnicodeStringFromStringPiece(name6),
+  };
+  int32_t args_count = 0;
+  icu::Formattable args[] = {
+      arg0.has_value(&args_count) ? *arg0.formattable : icu::Formattable(),
+      arg1.has_value(&args_count) ? *arg1.formattable : icu::Formattable(),
+      arg2.has_value(&args_count) ? *arg2.formattable : icu::Formattable(),
+      arg3.has_value(&args_count) ? *arg3.formattable : icu::Formattable(),
+      arg4.has_value(&args_count) ? *arg4.formattable : icu::Formattable(),
+      arg5.has_value(&args_count) ? *arg5.formattable : icu::Formattable(),
+      arg6.has_value(&args_count) ? *arg6.formattable : icu::Formattable(),
+  };
+
+  UnicodeString msg_string(msg.data(), msg.size());
+  UErrorCode error = U_ZERO_ERROR;
+  icu::MessageFormat format(msg_string, error);
+
+  icu::UnicodeString formatted;
+  format.format(names, args, args_count, formatted, error);
+  if (U_FAILURE(error)) {
+    LOG(ERROR) << "MessageFormat(" << msg.as_string() << ") failed with "
+               << u_errorName(error);
+    return string16();
+  }
+  return string16(formatted.getBuffer(), formatted.length());
+}
+
+}  // namespace i18n
+}  // namespace base