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-rw-r--r--nix/libutil/xml-writer.cc94
1 files changed, 94 insertions, 0 deletions
diff --git a/nix/libutil/xml-writer.cc b/nix/libutil/xml-writer.cc
new file mode 100644
index 0000000000..01794001b2
--- /dev/null
+++ b/nix/libutil/xml-writer.cc
@@ -0,0 +1,94 @@
+#include <assert.h>
+
+#include "xml-writer.hh"
+
+
+namespace nix {
+
+
+XMLWriter::XMLWriter(bool indent, std::ostream & output)
+ : output(output), indent(indent)
+{
+ output << "<?xml version='1.0' encoding='utf-8'?>" << std::endl;
+ closed = false;
+}
+
+
+XMLWriter::~XMLWriter()
+{
+ close();
+}
+
+
+void XMLWriter::close()
+{
+ if (closed) return;
+ while (!pendingElems.empty()) closeElement();
+ closed = true;
+}
+
+
+void XMLWriter::indent_(unsigned int depth)
+{
+ if (!indent) return;
+ output << string(depth * 2, ' ');
+}
+
+
+void XMLWriter::openElement(const string & name,
+ const XMLAttrs & attrs)
+{
+ assert(!closed);
+ indent_(pendingElems.size());
+ output << "<" << name;
+ writeAttrs(attrs);
+ output << ">";
+ if (indent) output << std::endl;
+ pendingElems.push_back(name);
+}
+
+
+void XMLWriter::closeElement()
+{
+ assert(!pendingElems.empty());
+ indent_(pendingElems.size() - 1);
+ output << "</" << pendingElems.back() << ">";
+ if (indent) output << std::endl;
+ pendingElems.pop_back();
+ if (pendingElems.empty()) closed = true;
+}
+
+
+void XMLWriter::writeEmptyElement(const string & name,
+ const XMLAttrs & attrs)
+{
+ assert(!closed);
+ indent_(pendingElems.size());
+ output << "<" << name;
+ writeAttrs(attrs);
+ output << " />";
+ if (indent) output << std::endl;
+}
+
+
+void XMLWriter::writeAttrs(const XMLAttrs & attrs)
+{
+ for (XMLAttrs::const_iterator i = attrs.begin(); i != attrs.end(); ++i) {
+ output << " " << i->first << "=\"";
+ for (unsigned int j = 0; j < i->second.size(); ++j) {
+ char c = i->second[j];
+ if (c == '"') output << "&quot;";
+ else if (c == '<') output << "&lt;";
+ else if (c == '>') output << "&gt;";
+ else if (c == '&') output << "&amp;";
+ /* Escape newlines to prevent attribute normalisation (see
+ XML spec, section 3.3.3. */
+ else if (c == '\n') output << "&#xA;";
+ else output << c;
+ }
+ output << "\"";
+ }
+}
+
+
+}