forked from lix-project/lix
04c4bd3624
values. This improves sharing and gives another speed up. Evaluation of the NixOS system attribute is now almost 7 times faster than the old evaluator.
135 lines
4.1 KiB
C++
135 lines
4.1 KiB
C++
#include "value-to-xml.hh"
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#include "xml-writer.hh"
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#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)
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{
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XMLAttrs attrs;
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attrs[name] = value;
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return attrs;
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}
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static void printValueAsXML(EvalState & state, bool strict, Value & v,
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XMLWriter & doc, PathSet & context, PathSet & drvsSeen);
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static void showAttrs(EvalState & state, bool strict, Bindings & attrs,
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XMLWriter & doc, PathSet & context, PathSet & drvsSeen)
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{
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StringSet names;
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foreach (Bindings::iterator, i, attrs)
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names.insert(i->first);
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foreach (StringSet::iterator, i, names) {
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XMLOpenElement _(doc, "attr", singletonAttrs("name", *i));
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printValueAsXML(state, strict, attrs[state.symbols.create(*i)], doc, context, drvsSeen);
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}
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}
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static void printValueAsXML(EvalState & state, bool strict, Value & v,
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XMLWriter & doc, PathSet & context, PathSet & drvsSeen)
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{
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checkInterrupt();
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if (strict) state.forceValue(v);
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switch (v.type) {
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case tInt:
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doc.writeEmptyElement("int", singletonAttrs("value", (format("%1%") % v.integer).str()));
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break;
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case tBool:
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doc.writeEmptyElement("bool", singletonAttrs("value", v.boolean ? "true" : "false"));
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break;
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case tString:
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/* !!! show the context? */
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doc.writeEmptyElement("string", singletonAttrs("value", v.string.s));
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break;
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case tPath:
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doc.writeEmptyElement("path", singletonAttrs("value", v.path));
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break;
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case tNull:
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doc.writeEmptyElement("null");
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break;
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case tAttrs:
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if (state.isDerivation(v)) {
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XMLAttrs xmlAttrs;
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Bindings::iterator a = v.attrs->find(state.symbols.create("derivation"));
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Path drvPath;
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a = v.attrs->find(state.sDrvPath);
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if (a != v.attrs->end() && a->second.type == tString)
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xmlAttrs["drvPath"] = drvPath = a->second.string.s;
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a = v.attrs->find(state.sOutPath);
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if (a != v.attrs->end() && a->second.type == tString)
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xmlAttrs["outPath"] = a->second.string.s;
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XMLOpenElement _(doc, "derivation", xmlAttrs);
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if (drvPath != "" && drvsSeen.find(drvPath) == drvsSeen.end()) {
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drvsSeen.insert(drvPath);
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showAttrs(state, strict, *v.attrs, doc, context, drvsSeen);
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} else
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doc.writeEmptyElement("repeated");
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}
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else {
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XMLOpenElement _(doc, "attrs");
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showAttrs(state, strict, *v.attrs, doc, context, drvsSeen);
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}
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break;
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case tList: {
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XMLOpenElement _(doc, "list");
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for (unsigned int n = 0; n < v.list.length; ++n)
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printValueAsXML(state, strict, *v.list.elems[n], doc, context, drvsSeen);
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break;
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}
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case tLambda: {
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XMLOpenElement _(doc, "function");
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if (v.lambda.fun->matchAttrs) {
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XMLAttrs attrs;
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if (!v.lambda.fun->arg.empty()) attrs["name"] = v.lambda.fun->arg;
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if (v.lambda.fun->formals->ellipsis) attrs["ellipsis"] = "1";
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XMLOpenElement _(doc, "attrspat", attrs);
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foreach (Formals::Formals_::iterator, i, v.lambda.fun->formals->formals)
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doc.writeEmptyElement("attr", singletonAttrs("name", i->name));
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} else
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doc.writeEmptyElement("varpat", singletonAttrs("name", v.lambda.fun->arg));
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break;
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}
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default:
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doc.writeEmptyElement("unevaluated");
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}
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}
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void printValueAsXML(EvalState & state, bool strict,
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Value & v, std::ostream & out, PathSet & context)
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{
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XMLWriter doc(true, out);
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XMLOpenElement root(doc, "expr");
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PathSet drvsSeen;
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printValueAsXML(state, strict, v, doc, context, drvsSeen);
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}
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}
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