Created helper class for parsing Apple style XML dictionaries.

chrome/utility/media_galleries/iapps_xml_utils.cc

Index: chrome/utility/media_galleries/iapps_xml_utils.cc
diff --git a/chrome/utility/media_galleries/iapps_xml_utils.cc b/chrome/utility/media_galleries/iapps_xml_utils.cc
index 987b6c193ecd7f1618b64840cb7773a65b3f1bf6..aed0ae92406b8cc6470990f7b104a12f3e275cd2 100644
--- a/chrome/utility/media_galleries/iapps_xml_utils.cc
+++ b/chrome/utility/media_galleries/iapps_xml_utils.cc
@@ -97,4 +97,64 @@ std::string ReadFileAsString(base::File file) {
   return result;
 }
 
+XmlDictReader::XmlDictReader(XmlReader* reader) : reader_(reader) {}
+
+XmlDictReader::~XmlDictReader() {}
+
+bool XmlDictReader::Read() {
+  if (reader_->NodeName() != "dict")
+    return false;
+
+  int dict_content_depth = reader_->Depth() + 1;
+  // Advance past the dict node and into the body of the dictionary.
+  if (!reader_->Read())
+    return false;
+
+  while (reader_->Depth() >= dict_content_depth && ShouldLoop()) {
+    if (!iapps::SeekToNodeAtCurrentDepth(reader_, "key"))
+      break;
+    std::string found_key;
+    if (!reader_->ReadElementContent(&found_key))
+      break;
+    DCHECK_EQ(dict_content_depth, reader_->Depth());
+
+    if (!HandleKey(found_key))
+      break;
+  }
+  // Seek to the end of the dictionary. Bail on end or error.
+  while (reader_->Depth() >= dict_content_depth && reader_->Next()) {
+  }
+  return FinishedOk();
+}
+
+bool XmlDictReader::ShouldLoop() {
+  return true;
+}
+
+bool XmlDictReader::HandleKey(const std::string& key) {
+  if (Found(key))
+    return AllowRepeats();
+  if (HandleKeyImpl(key)) {
+    found_.insert(key);
+    return true;
+  }
+  return false;
+}
+
+bool XmlDictReader::AllowRepeats() {
+  return false;
+}
+
+bool XmlDictReader::FinishedOk() {
+  return true;
+}
+
+bool XmlDictReader::SkipToNext() {
+  return SkipToNextElement(reader_) && reader_->Next();
+}
+
+bool XmlDictReader::Found(const std::string& key) const {
+  return ContainsKey(found_, key);
+}
+
 }  // namespace iapps