Created helper class for parsing Apple style XML dictionaries.

chrome/utility/media_galleries/iapps_xml_utils.cc

 // Copyright 2013 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 "chrome/utility/media_galleries/iapps_xml_utils.h"
 
 #include "base/logging.h"
 #include "base/stl_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "third_party/libxml/chromium/libxml_utils.h"
@@ skipping 79 matching lines @@
     return result;
 
   result.resize(file_info.size);
   int bytes_read = file.Read(0, string_as_array(&result), file_info.size);
   if (bytes_read != file_info.size)
     result.clear();
 
   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