tools/source/xml/XmlWalker.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  */
   9
  10 #include <tools/stream.hxx>
  11 #include <tools/XmlWalker.hxx>
  12
  13 #include <libxml/tree.h>
  14 #include <libxml/parser.h>
  15 #include <libxml/xmlstring.h>
  16 #include <vector>
  17
  18 namespace tools
  19 {
  20 struct XmlWalkerImpl
  21 {
  22     XmlWalkerImpl()
  23         : mpDocPtr(nullptr)
  24         , mpRoot(nullptr)
  25         , mpCurrent(nullptr)
  26     {
  27     }
  28
  29     xmlDocPtr mpDocPtr;
  30     xmlNodePtr mpRoot;
  31     xmlNodePtr mpCurrent;
  32
  33     std::vector<xmlNodePtr> mpStack;
  34 };
  35
  36 XmlWalker::XmlWalker()
  37     : mpImpl(std::make_unique<XmlWalkerImpl>())
  38 {
  39 }
  40
  41 XmlWalker::~XmlWalker()
  42 {
  43     if (mpImpl)
  44         xmlFreeDoc(mpImpl->mpDocPtr);
  45 }
  46
  47 bool XmlWalker::open(SvStream* pStream)
  48 {
  49     std::size_t nSize = pStream->remainingSize();
  50     std::vector<sal_uInt8> aBuffer(nSize + 1);
  51     pStream->ReadBytes(aBuffer.data(), nSize);
  52     aBuffer[nSize] = 0;
  53     mpImpl->mpDocPtr = xmlParseDoc(reinterpret_cast<xmlChar*>(aBuffer.data()));
  54     if (mpImpl->mpDocPtr == nullptr)
  55         return false;
  56     mpImpl->mpRoot = xmlDocGetRootElement(mpImpl->mpDocPtr);
  57     mpImpl->mpCurrent = mpImpl->mpRoot;
  58     mpImpl->mpStack.push_back(mpImpl->mpCurrent);
  59     return true;
  60 }
  61
  62 OString XmlWalker::name() { return reinterpret_cast<const char*>(mpImpl->mpCurrent->name); }
  63
  64 OString XmlWalker::namespaceHref()
  65 {
  66     return reinterpret_cast<const char*>(mpImpl->mpCurrent->ns->href);
  67 }
  68
  69 OString XmlWalker::namespacePrefix()
  70 {
  71     return reinterpret_cast<const char*>(mpImpl->mpCurrent->ns->prefix);
  72 }
  73
  74 OString XmlWalker::content()
  75 {
  76     OString aContent;
  77     if (mpImpl->mpCurrent->xmlChildrenNode != nullptr)
  78     {
  79         xmlChar* pContent
  80             = xmlNodeListGetString(mpImpl->mpDocPtr, mpImpl->mpCurrent->xmlChildrenNode, 1);
  81         aContent = OString(reinterpret_cast<const char*>(pContent));
  82         xmlFree(pContent);
  83     }
  84     return aContent;
  85 }
  86
  87 void XmlWalker::children()
  88 {
  89     mpImpl->mpStack.push_back(mpImpl->mpCurrent);
  90     mpImpl->mpCurrent = mpImpl->mpCurrent->xmlChildrenNode;
  91 }
  92
  93 void XmlWalker::parent()
  94 {
  95     mpImpl->mpCurrent = mpImpl->mpStack.back();
  96     mpImpl->mpStack.pop_back();
  97 }
  98
  99 OString XmlWalker::attribute(const OString& sName) const
 100 {
 101     xmlChar* xmlAttribute
 102         = xmlGetProp(mpImpl->mpCurrent, reinterpret_cast<const xmlChar*>(sName.getStr()));
 103     OString aAttributeContent(
 104         xmlAttribute == nullptr ? "" : reinterpret_cast<const char*>(xmlAttribute));
 105     xmlFree(xmlAttribute);
 106
 107     return aAttributeContent;
 108 }
 109
 110 void XmlWalker::next() { mpImpl->mpCurrent = mpImpl->mpCurrent->next; }
 111
 112 bool XmlWalker::isValid() const { return mpImpl->mpCurrent != nullptr; }
 113
 114 } // end tools namespace
 115
 116 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */