lix/src/libexpr/value-to-xml.cc

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#include "value-to-xml.hh"
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#include "xml-writer.hh"
#include "eval-inline.hh"
#include "util.hh"
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#include <cstdlib>
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namespace nix {
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static XMLAttrs singletonAttrs(const string & name, const string & value)
{
XMLAttrs attrs;
attrs[name] = value;
return attrs;
}
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static void printValueAsXML(EvalState & state, bool strict, bool location,
Value & v, XMLWriter & doc, PathSet & context, PathSet & drvsSeen,
const Pos & pos);
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static void posToXML(XMLAttrs & xmlAttrs, const Pos & pos)
{
xmlAttrs["path"] = pos.file;
xmlAttrs["line"] = (format("%1%") % pos.line).str();
xmlAttrs["column"] = (format("%1%") % pos.column).str();
}
static void showAttrs(EvalState & state, bool strict, bool location,
Bindings & attrs, XMLWriter & doc, PathSet & context, PathSet & drvsSeen)
{
StringSet names;
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for (auto & i : attrs)
names.insert(i.name);
for (auto & i : names) {
Attr & a(*attrs.find(state.symbols.create(i)));
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XMLAttrs xmlAttrs;
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xmlAttrs["name"] = i;
if (location && a.pos != ptr(&noPos)) posToXML(xmlAttrs, *a.pos);
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XMLOpenElement _(doc, "attr", xmlAttrs);
printValueAsXML(state, strict, location,
*a.value, doc, context, drvsSeen, *a.pos);
}
}
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static void printValueAsXML(EvalState & state, bool strict, bool location,
Value & v, XMLWriter & doc, PathSet & context, PathSet & drvsSeen,
const Pos & pos)
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{
checkInterrupt();
if (strict) state.forceValue(v, pos);
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switch (v.type()) {
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case nInt:
doc.writeEmptyElement("int", singletonAttrs("value", (format("%1%") % v.integer).str()));
break;
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case nBool:
doc.writeEmptyElement("bool", singletonAttrs("value", v.boolean ? "true" : "false"));
break;
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case nString:
/* !!! show the context? */
copyContext(v, context);
doc.writeEmptyElement("string", singletonAttrs("value", v.string.s));
break;
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case nPath:
doc.writeEmptyElement("path", singletonAttrs("value", v.path));
break;
case nNull:
doc.writeEmptyElement("null");
break;
case nAttrs:
if (state.isDerivation(v)) {
XMLAttrs xmlAttrs;
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Bindings::iterator a = v.attrs->find(state.symbols.create("derivation"));
Path drvPath;
a = v.attrs->find(state.sDrvPath);
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if (a != v.attrs->end()) {
if (strict) state.forceValue(*a->value, *a->pos);
if (a->value->type() == nString)
xmlAttrs["drvPath"] = drvPath = a->value->string.s;
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}
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a = v.attrs->find(state.sOutPath);
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if (a != v.attrs->end()) {
if (strict) state.forceValue(*a->value, *a->pos);
if (a->value->type() == nString)
xmlAttrs["outPath"] = a->value->string.s;
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}
XMLOpenElement _(doc, "derivation", xmlAttrs);
if (drvPath != "" && drvsSeen.insert(drvPath).second)
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showAttrs(state, strict, location, *v.attrs, doc, context, drvsSeen);
else
doc.writeEmptyElement("repeated");
}
else {
XMLOpenElement _(doc, "attrs");
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showAttrs(state, strict, location, *v.attrs, doc, context, drvsSeen);
}
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break;
case nList: {
XMLOpenElement _(doc, "list");
for (unsigned int n = 0; n < v.listSize(); ++n)
printValueAsXML(state, strict, location, *v.listElems()[n], doc, context, drvsSeen, pos);
break;
}
case nFunction: {
if (!v.isLambda()) {
// FIXME: Serialize primops and primopapps
doc.writeEmptyElement("unevaluated");
break;
}
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XMLAttrs xmlAttrs;
if (location) posToXML(xmlAttrs, v.lambda.fun->pos);
XMLOpenElement _(doc, "function", xmlAttrs);
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if (v.lambda.fun->hasFormals()) {
XMLAttrs attrs;
if (!v.lambda.fun->arg.empty()) attrs["name"] = v.lambda.fun->arg;
if (v.lambda.fun->formals->ellipsis) attrs["ellipsis"] = "1";
XMLOpenElement _(doc, "attrspat", attrs);
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for (auto & i : v.lambda.fun->formals->formals)
doc.writeEmptyElement("attr", singletonAttrs("name", i.name));
} else
doc.writeEmptyElement("varpat", singletonAttrs("name", v.lambda.fun->arg));
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break;
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}
case nExternal:
v.external->printValueAsXML(state, strict, location, doc, context, drvsSeen, pos);
break;
case nFloat:
doc.writeEmptyElement("float", singletonAttrs("value", (format("%1%") % v.fpoint).str()));
break;
case nThunk:
doc.writeEmptyElement("unevaluated");
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}
}
void ExternalValueBase::printValueAsXML(EvalState & state, bool strict,
bool location, XMLWriter & doc, PathSet & context, PathSet & drvsSeen,
const Pos & pos) const
{
doc.writeEmptyElement("unevaluated");
}
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void printValueAsXML(EvalState & state, bool strict, bool location,
Value & v, std::ostream & out, PathSet & context, const Pos & pos)
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{
XMLWriter doc(true, out);
XMLOpenElement root(doc, "expr");
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PathSet drvsSeen;
printValueAsXML(state, strict, location, v, doc, context, drvsSeen, pos);
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}
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}