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 /*
 Open Asset Import Library (assimp)
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 OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 */
 
 #ifndef INCLUDED_AI_IRRXML_WRAPPER
 #define INCLUDED_AI_IRRXML_WRAPPER
 
 #include <assimp/ai_assert.h>
 #include <assimp/StringUtils.h>
 #include <assimp/DefaultLogger.hpp>
 
 #include "BaseImporter.h"
 #include "IOStream.hpp"
 
 #include <pugixml.hpp>
 #include <utility>
 #include <vector>
 
 namespace Assimp {
 
 /// @brief  Will find a node by its name.
 struct find_node_by_name_predicate {
     /// @brief The default constructor.
     find_node_by_name_predicate() = default;
 
 
     std::string mName; ///< The name to find.
     find_node_by_name_predicate(const std::string &name) :
             mName(name) {
         // empty
     }
 
     bool operator()(pugi::xml_node node) const {
         return node.name() == mName;
     }
 };
 
 /// @brief  Will convert an attribute to its int value.
 /// @tparam[in] TNodeType  The node type.
 template <class TNodeType>
 struct NodeConverter {
 public:
     static int to_int(TNodeType &node, const char *attribName) {
         ai_assert(nullptr != attribName);
         return node.attribute(attribName).to_int();
     }
 };
 
 using XmlNode = pugi::xml_node;
 using XmlAttribute = pugi::xml_attribute;
 
 /// @brief The Xml-Parser class.
 ///
 /// Use this parser if you have to import any kind of xml-format.
 ///
 /// An example:
 /// @code
 /// TXmlParser<XmlNode> theParser;
 /// if (theParser.parse(fileStream)) {
 ///     auto node = theParser.getRootNode();
 ///     for ( auto currentNode : node.children()) {
 ///         // Will loop over all children
 ///     }
 /// }
 /// @endcode
 /// @tparam TNodeType
 template <class TNodeType>
 class TXmlParser {
 public:
     /// @brief The default class constructor.
     TXmlParser();
 
     /// @brief  The class destructor.
     ~TXmlParser();
 
     /// @brief  Will clear the parsed xml-file.
     void clear();
 
     /// @brief  Will search for a child-node by its name
     /// @param[in] name     The name of the child-node.
     /// @return The node instance or nullptr, if nothing was found.
     TNodeType *findNode(const std::string &name);
 
     /// @brief  Will return true, if the node is a child-node.
     /// @param[in]  name    The name of the child node to look for.
     /// @return true, if the node is a child-node or false if not.
     bool hasNode(const std::string &name);
 
     /// @brief  Will parse an xml-file from a given stream.
     /// @param[in] stream      The input stream.
     /// @return true, if the parsing was successful, false if not.
     bool parse(IOStream *stream);
 
     /// @brief  Will return true if a root node is there.
     /// @return true in case of an existing root.
     bool hasRoot() const;
 
     /// @brief  Will return the document pointer, is nullptr if no xml-file was parsed.
     /// @return The pointer showing to the document.
     pugi::xml_document *getDocument() const;
 
     /// @brief  Will return the root node, const version.
     /// @return The root node.
     const TNodeType getRootNode() const;
 
     /// @brief  Will return the root node, non-const version.
     /// @return The root node.
     TNodeType getRootNode();
 
     /// @brief Will check if a node with the given name is in.
     /// @param[in] node     The node to look in.
     /// @param[in] name     The name of the child-node.
     /// @return true, if node was found, false if not.
     static inline bool hasNode(XmlNode &node, const char *name);
 
     /// @brief Will check if an attribute is part of the XmlNode.
     /// @param[in] xmlNode  The node to search in.
     /// @param[in] name     The attribute name to look for.
     /// @return true, if the was found, false if not.
     static inline bool hasAttribute(XmlNode &xmlNode, const char *name);
 
     /// @brief Will try to get an unsigned int attribute value.
     /// @param[in] xmlNode  The node to search in.
     /// @param[in] name     The attribute name to look for.
     /// @param[out] val     The unsigned int value from the attribute.
     /// @return true, if the node contains an attribute with the given name and if the value is an unsigned int.
     static inline bool getUIntAttribute(XmlNode &xmlNode, const char *name, unsigned int &val);
 
     /// @brief Will try to get an int attribute value.
     /// @param[in] xmlNode  The node to search in.
     /// @param[in] name     The attribute name to look for.
     /// @param[out] val     The int value from the attribute.
     /// @return true, if the node contains an attribute with the given name and if the value is an int.
     static inline bool getIntAttribute(XmlNode &xmlNode, const char *name, int &val);
 
     /// @brief Will try to get a real attribute value.
     /// @param[in] xmlNode  The node to search in.
     /// @param[in] name     The attribute name to look for.
     /// @param[out] val     The real value from the attribute.
     /// @return true, if the node contains an attribute with the given name and if the value is a real.
     static inline bool getRealAttribute(XmlNode &xmlNode, const char *name, ai_real &val);
 
     /// @brief Will try to get a float attribute value.
     /// @param[in] xmlNode  The node to search in.
     /// @param[in] name     The attribute name to look for.
     /// @param[out] val     The float value from the attribute.
     /// @return true, if the node contains an attribute with the given name and if the value is a float.
     static inline bool getFloatAttribute(XmlNode &xmlNode, const char *name, float &val);
 
     /// @brief Will try to get a double attribute value.
     /// @param[in] xmlNode  The node to search in.
     /// @param[in] name     The attribute name to look for.
     /// @param[out] val     The double value from the attribute.
     /// @return true, if the node contains an attribute with the given name and if the value is a double.
     static inline bool getDoubleAttribute(XmlNode &xmlNode, const char *name, double &val);
 
     /// @brief Will try to get a std::string attribute value.
     /// @param[in] xmlNode  The node to search in.
     /// @param[in] name     The attribute name to look for.
     /// @param[out] val     The std::string value from the attribute.
     /// @return true, if the node contains an attribute with the given name and if the value is a std::string.
     static inline bool getStdStrAttribute(XmlNode &xmlNode, const char *name, std::string &val);
 
     /// @brief Will try to get a bool attribute value.
     /// @param[in] xmlNode  The node to search in.
     /// @param[in] name     The attribute name to look for.
     /// @param[out] val     The bool value from the attribute.
     /// @return true, if the node contains an attribute with the given name and if the value is a bool.
     static inline bool getBoolAttribute(XmlNode &xmlNode, const char *name, bool &val);
 
     /// @brief Will try to get the value of the node as a string.
     /// @param[in] node     The node to search in.
     /// @param[out] text    The value as a text.
     /// @return true, if the value can be read out.
     static inline bool getValueAsString(XmlNode &node, std::string &text);
 
     /// @brief Will try to get the value of the node as a real.
     /// @param[in]  node   The node to search in.
     /// @param[out] v      The value as a ai_real.
     /// @return true, if the value can be read out.
     static inline bool getValueAsReal(XmlNode &node, ai_real &v);
 
     /// @brief Will try to get the value of the node as a float.
     /// @param[in] node     The node to search in.
     /// @param[out]v        The value as a float.
     /// @return true, if the value can be read out.
     static inline bool getValueAsFloat(XmlNode &node, float &v);
 
     /// @brief Will try to get the value of the node as an integer.
     /// @param[in]  node    The node to search in.
     /// @param[out] i       The value as a int.
     /// @return true, if the value can be read out.
     static inline bool getValueAsInt(XmlNode &node, int &v);
 
     /// @brief Will try to get the value of the node as an bool.
     /// @param[in]  node    The node to search in.
     /// @param[out] v       The value as a bool.
     /// @return true, if the value can be read out.
     static inline bool getValueAsBool(XmlNode &node, bool &v);
 
 private:
     pugi::xml_document *mDoc;
     TNodeType mCurrent;
     std::vector<char> mData;
 };
 
 template <class TNodeType>
 inline TXmlParser<TNodeType>::TXmlParser() :
         mDoc(nullptr),
         mData() {
     // empty
 }
 
 template <class TNodeType>
 inline TXmlParser<TNodeType>::~TXmlParser() {
     clear();
 }
 
 template <class TNodeType>
 inline void TXmlParser<TNodeType>::clear() {
     if (mData.empty()) {
         if (mDoc) {
             delete mDoc;
         }
         mDoc = nullptr;
         return;
     }
 
     mData.clear();
     delete mDoc;
     mDoc = nullptr;
 }
 
 template <class TNodeType>
 inline TNodeType *TXmlParser<TNodeType>::findNode(const std::string &name) {
     if (name.empty()) {
         return nullptr;
     }
 
     if (nullptr == mDoc) {
         return nullptr;
     }
 
     find_node_by_name_predicate predicate(name);
     mCurrent = mDoc->find_node(std::move(predicate));
     if (mCurrent.empty()) {
         return nullptr;
     }
 
     return &mCurrent;
 }
 
 template <class TNodeType>
 bool TXmlParser<TNodeType>::hasNode(const std::string &name) {
     return nullptr != findNode(name);
 }
 
 template <class TNodeType>
 bool TXmlParser<TNodeType>::parse(IOStream *stream) {
     if (hasRoot()) {
         clear();
     }
 
     if (nullptr == stream) {
         ASSIMP_LOG_DEBUG("Stream is nullptr.");
         return false;
     }
 
     const size_t len = stream->FileSize();
     mData.resize(len + 1);
     memset(&mData[0], '\0', len + 1);
     stream->Read(&mData[0], 1, len);
 
     mDoc = new pugi::xml_document();
     // load_string assumes native encoding (aka always utf-8 per build options)
     //pugi::xml_parse_result parse_result = mDoc->load_string(&mData[0], pugi::parse_full);
      pugi::xml_parse_result parse_result = mDoc->load_buffer(&mData[0], mData.size(), pugi::parse_full);
     if (parse_result.status == pugi::status_ok) {
         return true;
     }
 
     ASSIMP_LOG_DEBUG("Error while parse xml.", std::string(parse_result.description()), " @ ", parse_result.offset);
 
     return false;
 }
 
 template <class TNodeType>
 bool TXmlParser<TNodeType>::hasRoot() const {
     return nullptr != mDoc;
 }
 
 template <class TNodeType>
 pugi::xml_document *TXmlParser<TNodeType>::getDocument() const {
     return mDoc;
 }
 
 template <class TNodeType>
 const TNodeType TXmlParser<TNodeType>::getRootNode() const {
     static pugi::xml_node none;
     if (nullptr == mDoc) {
         return none;
     }
     return mDoc->root();
 }
 
 template <class TNodeType>
 TNodeType TXmlParser<TNodeType>::getRootNode() {
     static pugi::xml_node none;
     if (nullptr == mDoc) {
         return none;
     }
 
     return mDoc->root();
 }
 
 template <class TNodeType>
 inline bool TXmlParser<TNodeType>::hasNode(XmlNode &node, const char *name) {
     pugi::xml_node child = node.find_child(find_node_by_name_predicate(name));
     return !child.empty();
 }
 
 template <class TNodeType>
 inline bool TXmlParser<TNodeType>::hasAttribute(XmlNode &xmlNode, const char *name) {
     pugi::xml_attribute attr = xmlNode.attribute(name);
     return !attr.empty();
 }
 
 template <class TNodeType>
 inline bool TXmlParser<TNodeType>::getUIntAttribute(XmlNode &xmlNode, const char *name, unsigned int &val) {
     pugi::xml_attribute attr = xmlNode.attribute(name);
     if (attr.empty()) {
         return false;
     }
 
     val = attr.as_uint();
     return true;
 }
 
 template <class TNodeType>
 inline bool TXmlParser<TNodeType>::getIntAttribute(XmlNode &xmlNode, const char *name, int &val) {
     pugi::xml_attribute attr = xmlNode.attribute(name);
     if (attr.empty()) {
         return false;
     }
 
     val = attr.as_int();
     return true;
 }
 
 template <class TNodeType>
 inline bool TXmlParser<TNodeType>::getRealAttribute(XmlNode &xmlNode, const char *name, ai_real &val) {
     pugi::xml_attribute attr = xmlNode.attribute(name);
     if (attr.empty()) {
         return false;
     }
 #ifdef ASSIMP_DOUBLE_PRECISION
     val = attr.as_double();
 #else
     val = attr.as_float();
 #endif
     return true;
 }
 
 template <class TNodeType>
 inline bool TXmlParser<TNodeType>::getFloatAttribute(XmlNode &xmlNode, const char *name, float &val) {
     pugi::xml_attribute attr = xmlNode.attribute(name);
     if (attr.empty()) {
         return false;
     }
 
     val = attr.as_float();
 
     return true;
 }
 
 template <class TNodeType>
 inline bool TXmlParser<TNodeType>::getDoubleAttribute(XmlNode &xmlNode, const char *name, double &val) {
     pugi::xml_attribute attr = xmlNode.attribute(name);
     if (attr.empty()) {
         return false;
     }
 
     val = attr.as_double();
 
     return true;
 }
 
 template <class TNodeType>
 inline bool TXmlParser<TNodeType>::getStdStrAttribute(XmlNode &xmlNode, const char *name, std::string &val) {
     pugi::xml_attribute attr = xmlNode.attribute(name);
     if (attr.empty()) {
         return false;
     }
 
     val = attr.as_string();
 
     return true;
 }
 
 template <class TNodeType>
 inline bool TXmlParser<TNodeType>::getBoolAttribute(XmlNode &xmlNode, const char *name, bool &val) {
     pugi::xml_attribute attr = xmlNode.attribute(name);
     if (attr.empty()) {
         return false;
     }
 
     val = attr.as_bool();
 
     return true;
 }
 
 template <class TNodeType>
 inline bool TXmlParser<TNodeType>::getValueAsString(XmlNode &node, std::string &text) {
     text = std::string();
     if (node.empty()) {
         return false;
     }
 
     text = node.text().as_string();
     text = ai_trim(text);
 
     return true;
 }
 
 template <class TNodeType>
 inline bool TXmlParser<TNodeType>::getValueAsReal(XmlNode& node, ai_real& v) {
     if (node.empty()) {
         return false;
     }
 
     v = node.text().as_float();
 
     return true;
 }
 
 
 template <class TNodeType>
 inline bool TXmlParser<TNodeType>::getValueAsFloat(XmlNode &node, float &v) {
     if (node.empty()) {
         return false;
     }
 
     v = node.text().as_float();
 
     return true;
 }
 
 template <class TNodeType>
 inline bool TXmlParser<TNodeType>::getValueAsInt(XmlNode &node, int &v) {
     if (node.empty()) {
         return false;
     }
 
     v = node.text().as_int();
 
     return true;
 }
 
 template <class TNodeType>
 inline bool TXmlParser<TNodeType>::getValueAsBool(XmlNode &node, bool &v) {
     if (node.empty()) {
         return false;
     }
 
     v = node.text().as_bool();
 
     return true;
 }
 
 using XmlParser = TXmlParser<pugi::xml_node>;
 
 /// @brief  This class declares an iterator to loop through all children of the root node.
 class XmlNodeIterator {
 public:
     /// @brief The iteration mode.
     enum IterationMode {
         PreOrderMode, ///< Pre-ordering, get the values, continue the iteration.
         PostOrderMode ///< Post-ordering, continue the iteration, get the values.
     };
     /// @brief  The class constructor
     /// @param  parent      [in] The xml parent to to iterate through.
     /// @param  mode        [in] The iteration mode.
     explicit XmlNodeIterator(XmlNode &parent, IterationMode mode) :
             mParent(parent),
             mNodes(),
             mIndex(0) {
         if (mode == PreOrderMode) {
             collectChildrenPreOrder(parent);
         } else {
             collectChildrenPostOrder(parent);
         }
     }
 
     /// @brief  The class destructor, default implementation.
     ~XmlNodeIterator() = default;
 
     /// @brief  Will iterate through all children in pre-order iteration.
     /// @param  node    [in] The nod to iterate through.
     void collectChildrenPreOrder(XmlNode &node) {
         if (node != mParent && node.type() == pugi::node_element) {
             mNodes.push_back(node);
         }
         for (XmlNode currentNode : node.children()) {
             collectChildrenPreOrder(currentNode);
         }
     }
 
     /// @brief  Will iterate through all children in post-order iteration.
     /// @param  node    [in] The nod to iterate through.
     void collectChildrenPostOrder(XmlNode &node) {
         for (XmlNode currentNode = node.first_child(); currentNode; currentNode = currentNode.next_sibling()) {
             collectChildrenPostOrder(currentNode);
         }
         if (node != mParent) {
             mNodes.push_back(node);
         }
     }
 
     /// @brief  Will iterate through all collected nodes.
     /// @param  next    The next node, if there is any.
     /// @return true, if there is a node left.
     bool getNext(XmlNode &next) {
         if (mIndex == mNodes.size()) {
             return false;
         }
 
         next = mNodes[mIndex];
         ++mIndex;
 
         return true;
     }
 
     /// @brief  Will return the number of collected nodes.
     /// @return The number of collected nodes.
     size_t size() const {
         return mNodes.size();
     }
 
     /// @brief  Returns true, if the node is empty.
     /// @return true, if the node is empty, false if not.
     bool isEmpty() const {
         return mNodes.empty();
     }
 
     /// @brief  Will clear all collected nodes.
     void clear() {
         if (mNodes.empty()) {
             return;
         }
 
         mNodes.clear();
         mIndex = 0;
     }
 
 private:
     XmlNode &mParent;
     std::vector<XmlNode> mNodes;
     size_t mIndex;
 };
 
 } // namespace Assimp
 
 #endif // !! INCLUDED_AI_IRRXML_WRAPPER

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