[cpp] Address UI.

This patch is part of a series of patches that enable showing an address
input form. This patch adds a function to build a list of
AddressUiComponents for a region code.

1 files changed, 131 insertions, 0 deletions

diff --git a/cpp/src/address_ui.cc b/cpp/src/address_ui.cc
new file mode 100644
index 0000000..2867dae
--- /dev/null
+++ b/cpp/src/address_ui.cc
@@ -0,0 +1,131 @@
+// Copyright (C) 2013 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_ui.h>
+
+#include <libaddressinput/address_field.h>
+#include <libaddressinput/address_ui_component.h>
+#include <libaddressinput/localization.h>
+
+#include <string>
+#include <vector>
+
+#include "address_field_util.h"
+#include "grit.h"
+#include "messages.h"
+#include "region_data_constants.h"
+#include "rule.h"
+
+namespace i18n {
+namespace addressinput {
+
+namespace {
+
+// Parses the default region data into the static Rule object and returns a
+// constant reference to this object. Cannot return a copy of the object,
+// because Rule objects are not copyable.
+const Rule& InitDefaultRule() {
+  static Rule rule;
+  rule.ParseSerializedRule(RegionDataConstants::GetDefaultRegionData());
+  return rule;
+}
+
+// Returns the constant reference to the Rule object from InitDefaultRule(). The
+// static object is in InitDefaultRule(), but this function maintains a constant
+// static reference to it. The constant static reference avoids re-parsing the
+// default region data.
+const Rule& GetDefaultRule() {
+  static const Rule& kDefaultRule(InitDefaultRule());
+  return kDefaultRule;
+}
+
+int GetMessageIdForField(AddressField field,
+                         int admin_area_name_message_id,
+                         int postal_code_name_message_id) {
+  switch (field) {
+    case COUNTRY:
+      return IDS_LIBADDRESSINPUT_I18N_COUNTRY_LABEL;
+    case ADMIN_AREA:
+      return admin_area_name_message_id;
+    case LOCALITY:
+      return IDS_LIBADDRESSINPUT_I18N_LOCALITY_LABEL;
+    case DEPENDENT_LOCALITY:
+      return IDS_LIBADDRESSINPUT_I18N_DEPENDENT_LOCALITY_LABEL;
+    case SORTING_CODE:
+      return IDS_LIBADDRESSINPUT_I18N_CEDEX_LABEL;
+    case POSTAL_CODE:
+      return postal_code_name_message_id;
+    case STREET_ADDRESS:
+      return IDS_LIBADDRESSINPUT_I18N_ADDRESS_LINE1_LABEL;
+    case ORGANIZATION:
+      return IDS_LIBADDRESSINPUT_I18N_ORGANIZATION_LABEL;
+    case RECIPIENT:
+      return IDS_LIBADDRESSINPUT_I18N_RECIPIENT_LABEL;
+    default:
+      return INVALID_MESSAGE_ID;
+  }
+}
+
+bool IsNewline(AddressField field) {
+  // NEWLINE is an extension for AddressField enum that's used only internally.
+  return field == static_cast<AddressField>(NEWLINE);
+}
+
+}  // namespace
+
+const std::vector<std::string>& GetRegionCodes() {
+  return RegionDataConstants::GetRegionCodes();
+}
+
+std::vector<AddressUiComponent> BuildComponents(
+    const std::string& region_code,
+    const Localization& localization) {
+  std::vector<AddressUiComponent> result;
+
+  Rule rule;
+  rule.CopyFrom(GetDefaultRule());
+  if (!rule.ParseSerializedRule(
+           RegionDataConstants::GetRegionData(region_code))) {
+    return result;
+  }
+
+  bool previous_field_is_newline = true;
+  bool next_field_is_newline = true;
+  for (std::vector<AddressField>::const_iterator field_it =
+       rule.GetFormat().begin();
+       field_it != rule.GetFormat().end(); ++field_it) {
+    if (IsNewline(*field_it)) {
+      previous_field_is_newline = true;
+      continue;
+    }
+    AddressUiComponent component;
+    std::vector<AddressField>::const_iterator next_field_it = field_it + 1;
+    next_field_is_newline =
+        next_field_it == rule.GetFormat().end() || IsNewline(*next_field_it);
+    component.length_hint = previous_field_is_newline && next_field_is_newline
+                                ? AddressUiComponent::HINT_LONG
+                                : AddressUiComponent::HINT_SHORT;
+    previous_field_is_newline = false;
+    component.field = *field_it;
+    component.name = localization.GetString(
+        GetMessageIdForField(*field_it, rule.GetAdminAreaNameMessageId(),
+                             rule.GetPostalCodeNameMessageId()));
+    result.push_back(component);
+  }
+
+  return result;
+}
+
+}  // namespace addressinput
+}  // namespace i18n