1 files changed, 52 insertions, 0 deletions
diff --git a/third_party/nix/src/libutil/xml-writer.hh b/third_party/nix/src/libutil/xml-writer.hh
new file mode 100644
index 000000000000..d6f7cddb35ac
--- /dev/null
+++ b/third_party/nix/src/libutil/xml-writer.hh
@@ -0,0 +1,52 @@
+#pragma once
+
+#include <iostream>
+#include <list>
+#include <map>
+#include <string>
+
+namespace nix {
+
+typedef std::map<std::string, std::string> XMLAttrs;
+
+class XMLWriter {
+ private:
+  std::ostream& output;
+
+  bool indent;
+  bool closed;
+
+  std::list<std::string> pendingElems;
+
+ public:
+  XMLWriter(bool indent, std::ostream& output);
+  ~XMLWriter();
+
+  void close();
+
+  void openElement(const std::string& name, const XMLAttrs& attrs = XMLAttrs());
+  void closeElement();
+
+  void writeEmptyElement(const std::string& name,
+                         const XMLAttrs& attrs = XMLAttrs());
+
+ private:
+  void writeAttrs(const XMLAttrs& attrs);
+
+  void indent_(size_t depth);
+};
+
+class XMLOpenElement {
+ private:
+  XMLWriter& writer;
+
+ public:
+  XMLOpenElement(XMLWriter& writer, const std::string& name,
+                 const XMLAttrs& attrs = XMLAttrs())
+      : writer(writer) {
+    writer.openElement(name, attrs);
+  }
+  ~XMLOpenElement() { writer.closeElement(); }
+};
+
+}  // namespace nix