131 lines
2.7 KiB
C++
131 lines
2.7 KiB
C++
#include <assert.h>
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#include "xml-writer.hh"
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namespace nix {
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XMLWriter::XMLWriter(bool indent, std::ostream & output)
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: output(output), indent(indent)
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{
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output << "<?xml version='1.0' encoding='utf-8'?>\n";
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closed = false;
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}
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XMLWriter::~XMLWriter()
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{
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close();
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}
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void XMLWriter::close()
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{
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if (closed) return;
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while (!pendingElems.empty()) closeElement();
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closed = true;
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}
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void XMLWriter::indent_(unsigned int depth)
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{
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if (!indent) return;
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output << string(depth * 2, ' ');
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}
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void XMLWriter::openElement(const string & name,
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const XMLAttrs & attrs)
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{
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assert(!closed);
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indent_(pendingElems.size());
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output << "<" << name;
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writeAttrs(attrs);
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output << ">";
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if (indent) output << "\n";
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pendingElems.push_back(name);
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}
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void XMLWriter::closeElement()
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{
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assert(!pendingElems.empty());
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indent_(pendingElems.size() - 1);
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output << "</" << pendingElems.back() << ">";
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if (indent) output << "\n";
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pendingElems.pop_back();
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if (pendingElems.empty()) closed = true;
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}
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void XMLWriter::writeEmptyElement(const string & name,
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const XMLAttrs & attrs)
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{
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assert(!closed);
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indent_(pendingElems.size());
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output << "<" << name;
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writeAttrs(attrs);
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output << " />";
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if (indent) output << "\n";
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}
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void XMLWriter::writeCharData(const string & data)
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{
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assert(!pendingElems.empty());
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for (unsigned int i = 0; i < data.size(); ++i) {
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char c = data[i];
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if (c == '<') output << "<";
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else if (c == '&') output << "&";
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else output << c;
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}
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}
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void XMLWriter::writeAttrs(const XMLAttrs & attrs)
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{
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for (XMLAttrs::const_iterator i = attrs.begin(); i != attrs.end(); ++i) {
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output << " " << i->first << "=\"";
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for (unsigned int j = 0; j < i->second.size(); ++j) {
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char c = i->second[j];
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if (c == '"') output << """;
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else if (c == '<') output << "<";
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else if (c == '>') output << ">";
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else if (c == '&') output << "&";
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/* Escape newlines to prevent attribute normalisation (see
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XML spec, section 3.3.3. */
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else if (c == '\n') output << "
";
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else output << c;
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}
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output << "\"";
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}
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}
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#if 0
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int main(int argc, char * * argv)
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{
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XMLWriter doc(cout);
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// OpenElement e(doc, "foo");
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doc.openElement("foo");
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doc.writeCharData("dit is een test &\n");
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doc.writeCharData("<foo>\n");
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for (int i = 0; i < 5; ++i) {
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XMLAttrs attrs;
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attrs["a"] = "b";
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attrs["bla"] = "<foo>'&\">";
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XMLOpenElement e(doc, "item", attrs);
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doc.writeCharData("x");
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}
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return 0;
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}
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#endif
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}
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