Reland of "Use address_data.h from upstream libaddressinput".

third_party/libaddressinput/chromium/cpp/src/address_metadata.cc

+// Copyright (C) 2014 Google Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <libaddressinput/address_metadata.h>
+
+#include <libaddressinput/address_field.h>
+
+#include <algorithm>
+#include <string>
+
+#include "region_data_constants.h"
+#include "rule.h"
+
+namespace i18n {
+namespace addressinput {
+
+bool IsFieldRequired(AddressField field, const std::string& region_code) {
+  if (field == COUNTRY) {
+    return true;
+  }
+
+  Rule rule;
+  rule.CopyFrom(Rule::GetDefault());
+  if (!rule.ParseSerializedRule(
+          RegionDataConstants::GetRegionData(region_code))) {
+    return false;
+  }
+
+  return std::find(rule.GetRequired().begin(),
+                   rule.GetRequired().end(),
+                   field) != rule.GetRequired().end();
+}
+
+bool IsFieldUsed(AddressField field, const std::string& region_code) {
+  if (field == COUNTRY) {
+    return true;
+  }
+
+  Rule rule;
+  rule.CopyFrom(Rule::GetDefault());
+  if (!rule.ParseSerializedRule(
+          RegionDataConstants::GetRegionData(region_code))) {
+    return false;
+  }
+
+  FormatElement to_find(field);
+  for (std::vector<std::vector<FormatElement> >::const_iterator line_it =
+           rule.GetFormat().begin();
+       line_it != rule.GetFormat().end();
+       ++line_it) {
+    if (std::find(line_it->begin(), line_it->end(), to_find) != line_it->end())
+      return true;
+  }
+
+  return false;
+}
+
+}  // namespace addressinput
+}  // namespace i18n