/*
 * Copyright (C) 2005 Frerich Raabe <raabe@kde.org>
 * Copyright (C) 2006, 2009 Apple Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "third_party/blink/renderer/core/xml/xpath_util.h"

#include "third_party/blink/renderer/core/dom/container_node.h"
#include "third_party/blink/renderer/core/dom/node_traversal.h"
#include "third_party/blink/renderer/platform/wtf/text/string_builder.h"

namespace blink {
namespace xpath {

bool IsRootDomNode(Node* node) {
  return node && !node->parentNode();
}

String StringValue(Node* node) {
  switch (node->getNodeType()) {
    case Node::kAttributeNode:
    case Node::kProcessingInstructionNode:
    case Node::kCommentNode:
    case Node::kTextNode:
    case Node::kCdataSectionNode:
      return node->nodeValue();
    default:
      if (IsRootDomNode(node) || node->IsElementNode()) {
        StringBuilder result;
        result.ReserveCapacity(1024);

        for (Node& n : NodeTraversal::DescendantsOf(*node)) {
          if (n.IsTextNode()) {
            const String& node_value = n.nodeValue();
            result.Append(node_value);
          }
        }

        return result.ToString();
      }
  }

  return String();
}

bool IsValidContextNode(Node* node) {
  if (!node)
    return false;
  switch (node->getNodeType()) {
    case Node::kAttributeNode:
    case Node::kTextNode:
    case Node::kCdataSectionNode:
    case Node::kCommentNode:
    case Node::kDocumentNode:
    case Node::kElementNode:
    case Node::kProcessingInstructionNode:
      return true;
    case Node::kDocumentFragmentNode:
    case Node::kDocumentTypeNode:
      return false;
  }
  NOTREACHED();
}

bool IsXMLSpace(UChar ch) {
  return ch <= 0x20 && (ch == 0x20 || ch == 0x09 || ch == 0x0D || ch == 0x0A);
}

}  // namespace xpath
}  // namespace blink