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Merge pull request #6909 from ncfavier/json-paths

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JSON: print paths as strings without copying them to the store
This commit is contained in:
Eelco Dolstra 2022-08-23 15:19:33 +02:00 committed by GitHub
commit 0e54fab0dd
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5 changed files with 20 additions and 15 deletions
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21
src/libexpr/value-to-json.cc
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@ -10,7 +10,7 @@
namespace nix {
void printValueAsJSON(EvalState & state, bool strict,
Value & v, const PosIdx pos, JSONPlaceholder & out, PathSet & context)
Value & v, const PosIdx pos, JSONPlaceholder & out, PathSet & context, bool copyToStore)
{
checkInterrupt();
@ -32,7 +32,10 @@ void printValueAsJSON(EvalState & state, bool strict,
break;
case nPath:
out.write(state.copyPathToStore(context, v.path));
if (copyToStore)
out.write(state.copyPathToStore(context, v.path));
else
out.write(v.path);
break;
case nNull:
@ -54,10 +57,10 @@ void printValueAsJSON(EvalState & state, bool strict,
for (auto & j : names) {
Attr & a(*v.attrs->find(state.symbols.create(j)));
auto placeholder(obj.placeholder(j));
printValueAsJSON(state, strict, *a.value, a.pos, placeholder, context);
printValueAsJSON(state, strict, *a.value, a.pos, placeholder, context, copyToStore);
}
} else
printValueAsJSON(state, strict, *i->value, i->pos, out, context);
printValueAsJSON(state, strict, *i->value, i->pos, out, context, copyToStore);
break;
}
@ -65,13 +68,13 @@ void printValueAsJSON(EvalState & state, bool strict,
auto list(out.list());
for (auto elem : v.listItems()) {
auto placeholder(list.placeholder());
printValueAsJSON(state, strict, *elem, pos, placeholder, context);
printValueAsJSON(state, strict, *elem, pos, placeholder, context, copyToStore);
}
break;
}
case nExternal:
v.external->printValueAsJSON(state, strict, out, context);
v.external->printValueAsJSON(state, strict, out, context, copyToStore);
break;
case nFloat:
@ -91,14 +94,14 @@ void printValueAsJSON(EvalState & state, bool strict,
}
void printValueAsJSON(EvalState & state, bool strict,
Value & v, const PosIdx pos, std::ostream & str, PathSet & context)
Value & v, const PosIdx pos, std::ostream & str, PathSet & context, bool copyToStore)
{
JSONPlaceholder out(str);
printValueAsJSON(state, strict, v, pos, out, context);
printValueAsJSON(state, strict, v, pos, out, context, copyToStore);
}
void ExternalValueBase::printValueAsJSON(EvalState & state, bool strict,
JSONPlaceholder & out, PathSet & context) const
JSONPlaceholder & out, PathSet & context, bool copyToStore) const
{
state.debugThrowLastTrace(TypeError("cannot convert %1% to JSON", showType()));
}

4
src/libexpr/value-to-json.hh
View File

@ -11,9 +11,9 @@ namespace nix {
class JSONPlaceholder;
void printValueAsJSON(EvalState & state, bool strict,
Value & v, const PosIdx pos, JSONPlaceholder & out, PathSet & context);
Value & v, const PosIdx pos, JSONPlaceholder & out, PathSet & context, bool copyToStore = true);
void printValueAsJSON(EvalState & state, bool strict,
Value & v, const PosIdx pos, std::ostream & str, PathSet & context);
Value & v, const PosIdx pos, std::ostream & str, PathSet & context, bool copyToStore = true);
}

2
src/libexpr/value.hh
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@ -99,7 +99,7 @@ class ExternalValueBase
/* Print the value as JSON. Defaults to unconvertable, i.e. throws an error */
virtual void printValueAsJSON(EvalState & state, bool strict,
JSONPlaceholder & out, PathSet & context) const;
JSONPlaceholder & out, PathSet & context, bool copyToStore = true) const;
/* Print the value as XML. Defaults to unevaluated */
virtual void printValueAsXML(EvalState & state, bool strict, bool location,

5
src/nix-instantiate/nix-instantiate.cc
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@ -52,9 +52,10 @@ void processExpr(EvalState & state, const Strings & attrPaths,
state.autoCallFunction(autoArgs, v, vRes);
if (output == okXML)
printValueAsXML(state, strict, location, vRes, std::cout, context, noPos);
else if (output == okJSON)
else if (output == okJSON) {
printValueAsJSON(state, strict, vRes, v.determinePos(noPos), std::cout, context);
else {
std::cout << std::endl;
} else {
if (strict) state.forceValueDeep(vRes);
vRes.print(state.symbols, std::cout);
std::cout << std::endl;

3
src/nix/eval.cc
View File

@ -116,7 +116,8 @@ struct CmdEval : MixJSON, InstallableCommand
else if (json) {
JSONPlaceholder jsonOut(std::cout);
printValueAsJSON(*state, true, *v, pos, jsonOut, context);
printValueAsJSON(*state, true, *v, pos, jsonOut, context, false);
std::cout << std::endl;
}
else {