Add a CFX_XMLDocument class.

This CL adds a CFX_XMLDocument to act as the XML node container. All
nodes are now owned by the document and the document is returned by the
CFX_XMLParser.

Classes which parse XML files now store the document instead of the root
node.

BUG: chromium:835636
Change-Id: I1e07d6115cf14714911d6fd4c3fa920c94fd5faf
Reviewed-on: https://pdfium-review.googlesource.com/31313
Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
Commit-Queue: dsinclair <dsinclair@chromium.org>

1 files changed, 37 insertions, 0 deletions

diff --git a/core/fxcrt/xml/cfx_xmldocument.h b/core/fxcrt/xml/cfx_xmldocument.h
new file mode 100644
index 0000000000..a568f8390f
--- /dev/null
+++ b/core/fxcrt/xml/cfx_xmldocument.h
@@ -0,0 +1,37 @@
+// Copyright 2018 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CORE_FXCRT_XML_CFX_XMLDOCUMENT_H_
+#define CORE_FXCRT_XML_CFX_XMLDOCUMENT_H_
+
+#include <memory>
+#include <utility>
+#include <vector>
+
+#include "core/fxcrt/unowned_ptr.h"
+#include "core/fxcrt/xml/cfx_xmlelement.h"
+#include "third_party/base/ptr_util.h"
+
+class CFX_XMLInstruction;
+class CFX_XMLNode;
+
+class CFX_XMLDocument {
+ public:
+  CFX_XMLDocument();
+  ~CFX_XMLDocument();
+
+  CFX_XMLElement* GetRoot() const { return root_.Get(); }
+
+  template <typename T, typename... Args>
+  T* CreateNode(Args&&... args) {
+    nodes_.push_back(pdfium::MakeUnique<T>(std::forward<Args>(args)...));
+    return static_cast<T*>(nodes_.back().get());
+  }
+
+ private:
+  std::vector<std::unique_ptr<CFX_XMLNode>> nodes_;
+  UnownedPtr<CFX_XMLElement> root_;
+};
+
+#endif  // CORE_FXCRT_XML_CFX_XMLDOCUMENT_H_