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src/util/xml/XmlWriter.h

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+// Copyright 2016, University of Freiburg,
+// Chair of Algorithms and Data Structures.
+// Authors: Patrick Brosi <brosi@informatik.uni-freiburg.de>
+
+#ifndef UTIL_XML_XMLWRITER_H_
+#define UTIL_XML_XMLWRITER_H_
+
+#include <map>
+#include <ostream>
+#include <stack>
+#include <string>
+
+namespace util {
+namespace xml {
+
+class XmlWriterException : public std::exception {
+ public:
+  XmlWriterException(std::string msg) : _msg(msg) {}
+  ~XmlWriterException() throw() {}
+
+  virtual const char* what() const throw() { return _msg.c_str(); };
+
+ private:
+  std::string _msg;
+};
+
+// simple XML writer class without much overhead
+class XmlWriter {
+ public:
+  explicit XmlWriter(std::ostream* out);
+  XmlWriter(std::ostream* out, bool pretty);
+  XmlWriter(std::ostream* out, bool pretty, size_t indent);
+  ~XmlWriter(){};
+
+  // open tag without attributes
+  void openTag(const std::string& tag);
+
+  // open tag with single attribute (for convenience...)
+  void openTag(const std::string& tag, const std::string& key,
+               const std::string& val);
+
+  // open tag with attribute list
+  void openTag(const std::string& tag,
+               const std::map<std::string, std::string>& attrs);
+
+  // open comment
+  void openComment();
+
+  // write text
+  void writeText(const std::string& text);
+
+  // close tag
+  void closeTag();
+
+  // close all open tags, essentially closing the document
+  void closeTags();
+
+ private:
+  enum XML_NODE_T { TAG, TEXT, COMMENT };
+
+  struct XmlNode {
+    XmlNode(XML_NODE_T t, const std::string& pload, bool hanging)
+        : t(t), pload(pload), hanging(hanging) {}
+    XML_NODE_T t;
+    std::string pload;
+    bool hanging;
+  };
+
+  std::ostream* _out;
+  std::stack<XmlNode> _nstack;
+
+  bool _pretty;
+  size_t _indent;
+
+  // handles indentation
+  void doIndent();
+
+  // close "hanging" tags
+  void closeHanging();
+
+  // pushes XML escaped text to stream
+  void putEsced(std::ostream* out, const std::string& str, char quot);
+
+  // checks tag names for validiy
+  void checkTagName(const std::string& str) const;
+};
+
+}  // namespace xml
+}  // namespace util
+
+#endif  // UTIL_XML_XMLWRITER_H_