#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'?>\n"; 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 << "\n"; pendingElems.push_back(name); } void XMLWriter::closeElement() { assert(!pendingElems.empty()); indent_(pendingElems.size() - 1); output << "</" << pendingElems.back() << ">"; if (indent) output << "\n"; 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 << "\n"; } void XMLWriter::writeCharData(const string & data) { assert(!pendingElems.empty()); for (unsigned int i = 0; i < data.size(); ++i) { char c = data[i]; if (c == '<') output << "<"; else if (c == '&') output << "&"; else output << c; } } 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 << """; else if (c == '<') output << "<"; else if (c == '>') output << ">"; else if (c == '&') output << "&"; /* Escape newlines to prevent attribute normalisation (see XML spec, section 3.3.3. */ else if (c == '\n') output << "
"; else output << c; } output << "\""; } } #if 0 int main(int argc, char * * argv) { XMLWriter doc(cout); // OpenElement e(doc, "foo"); doc.openElement("foo"); doc.writeCharData("dit is een test &\n"); doc.writeCharData("<foo>\n"); for (int i = 0; i < 5; ++i) { XMLAttrs attrs; attrs["a"] = "b"; attrs["bla"] = "<foo>'&\">"; XMLOpenElement e(doc, "item", attrs); doc.writeCharData("x"); } return 0; } #endif }