1 files changed, 74 insertions, 0 deletions
diff --git a/src/xml.h b/src/xml.h
new file mode 100644
index 0000000..add95f1
--- /dev/null
+++ b/src/xml.h
@@ -0,0 +1,74 @@
+#ifndef XML_H
+#define XML_H
+
+#include <memory>
+#include <functional>
+#include <string>
+#include <unordered_map>
+
+/*! @brief Event handlers that can installed by the client and called while parsing a XML document.
+ */
+class XMLHandlers
+{
+  public:
+    using Attributes       = std::unordered_map<std::string,std::string>;
+    using StartDocType     = void();
+    using EndDocType       = void();
+    using StartElementType = void(const std::string &,const Attributes &);
+    using EndElementType   = void(const std::string &);
+    using ErrorType        = void(const std::string,int,const std::string &);
+    using CharsType        = void(const std::string &);
+
+    std::function<StartDocType>      startDocument; /**< handler invoked at the start of the document */
+    std::function<EndDocType>        endDocument;   /**< handler invoked at the end of the document */
+    std::function<StartElementType>  startElement;  /**< handler invoked when an opening tag has been found */
+    std::function<EndElementType>    endElement;    /**< handler invoked when a closing tag has been found */
+    std::function<CharsType>         characters;    /**< handler invoked when content between tags has been found */
+    std::function<ErrorType>         error;         /**< handler invoked when the parser encounters an error */
+
+    static std::string value(const Attributes &attrib,const std::string &key)
+    {
+      auto it = attrib.find(key);
+      if (it!=attrib.end())
+      {
+        return it->second;
+      }
+      return "";
+    }
+};
+
+class XMLLocator
+{
+  public:
+    virtual ~XMLLocator() {}
+    virtual int lineNr() const = 0;
+    virtual std::string fileName() const = 0;
+};
+
+/*! Very basic SAX style parser to parse XML documents. */
+class XMLParser : public XMLLocator
+{
+  public:
+    /*! Creates an instance of the parser object. Different instances can run on different
+     *  threads without interference.
+     *
+     *  @param handlers The event handlers passed by the client.
+     */
+    XMLParser(const XMLHandlers &handlers);
+    /*! Destructor */
+   ~XMLParser();
+
+    /*! Parses a file gives the contents of the file as a string.
+     *  @param fileName the name of the file, used for error reporting.
+     *  @param inputString the contents of the file as a zero terminated UTF-8 string.
+     */
+    void parse(const char *fileName,const char *inputString);
+
+  private:
+   virtual int lineNr() const override;
+   virtual std::string fileName() const override;
+   struct Private;
+   std::unique_ptr<Private> p;
+};
+
+#endif