nix-super/src/libutil/xml-writer.cc

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#include <assert.h>
#include "xml-writer.hh"
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namespace nix {
XMLWriter::XMLWriter(bool indent, std::ostream & output)
: output(output), indent(indent)
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{
output << "<?xml version='1.0' encoding='utf-8'?>" << std::endl;
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closed = false;
}
XMLWriter::~XMLWriter()
{
close();
}
void XMLWriter::close()
{
if (closed) return;
while (!pendingElems.empty()) closeElement();
closed = true;
}
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void XMLWriter::indent_(size_t depth)
{
if (!indent) return;
output << string(depth * 2, ' ');
}
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void XMLWriter::openElement(const string & name,
const XMLAttrs & attrs)
{
assert(!closed);
indent_(pendingElems.size());
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output << "<" << name;
writeAttrs(attrs);
output << ">";
if (indent) output << std::endl;
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pendingElems.push_back(name);
}
void XMLWriter::closeElement()
{
assert(!pendingElems.empty());
indent_(pendingElems.size() - 1);
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output << "</" << pendingElems.back() << ">";
if (indent) output << std::endl;
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pendingElems.pop_back();
if (pendingElems.empty()) closed = true;
}
void XMLWriter::writeEmptyElement(const string & name,
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const XMLAttrs & attrs)
{
assert(!closed);
indent_(pendingElems.size());
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output << "<" << name;
writeAttrs(attrs);
output << " />";
if (indent) output << std::endl;
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}
void XMLWriter::writeAttrs(const XMLAttrs & attrs)
{
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for (auto & i : attrs) {
output << " " << i.first << "=\"";
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for (size_t j = 0; j < i.second.size(); ++j) {
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char c = i.second[j];
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if (c == '"') output << "&quot;";
else if (c == '<') output << "&lt;";
else if (c == '>') output << "&gt;";
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else if (c == '&') output << "&amp;";
/* Escape newlines to prevent attribute normalisation (see
XML spec, section 3.3.3. */
else if (c == '\n') output << "&#xA;";
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else output << c;
}
output << "\"";
}
}
}