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findAlongAttrPath(): Return position

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This commit is contained in:
Eelco Dolstra 2020-02-07 14:08:24 +01:00
parent 84a3a5c3cd
commit 0b013a54dc
9 changed files with 17 additions and 14 deletions
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9
src/libexpr/attr-path.cc
View file

@ -32,7 +32,7 @@ static Strings parseAttrPath(const string & s)
}
Value * findAlongAttrPath(EvalState & state, const string & attrPath,
std::pair<Value *, Pos> findAlongAttrPath(EvalState & state, const string & attrPath,
Bindings & autoArgs, Value & vIn)
{
Strings tokens = parseAttrPath(attrPath);
@ -41,6 +41,7 @@ Value * findAlongAttrPath(EvalState & state, const string & attrPath,
Error(format("attribute selection path '%1%' does not match expression") % attrPath);
Value * v = &vIn;
Pos pos = noPos;
for (auto & attr : tokens) {
@ -72,6 +73,7 @@ Value * findAlongAttrPath(EvalState & state, const string & attrPath,
if (a == v->attrs->end())
throw AttrPathNotFound("attribute '%1%' in selection path '%2%' not found", attr, attrPath);
v = &*a->value;
pos = *a->pos;
}
else if (apType == apIndex) {
@ -85,11 +87,12 @@ Value * findAlongAttrPath(EvalState & state, const string & attrPath,
throw AttrPathNotFound("list index %1% in selection path '%2%' is out of range", attrIndex, attrPath);
v = v->listElems()[attrIndex];
pos = noPos;
}
}
return v;
return {v, pos};
}
@ -98,7 +101,7 @@ Pos findDerivationFilename(EvalState & state, Value & v, std::string what)
Value * v2;
try {
auto dummyArgs = state.allocBindings(0);
v2 = findAlongAttrPath(state, "meta.position", *dummyArgs, v);
v2 = findAlongAttrPath(state, "meta.position", *dummyArgs, v).first;
} catch (Error &) {
throw Error("package '%s' has no source location information", what);
}

2
src/libexpr/attr-path.hh
View file

@ -9,7 +9,7 @@ namespace nix {
MakeError(AttrPathNotFound, Error);
Value * findAlongAttrPath(EvalState & state, const string & attrPath,
std::pair<Value *, Pos> findAlongAttrPath(EvalState & state, const string & attrPath,
Bindings & autoArgs, Value & vIn);
/* Heuristic to find the filename and lineno or a nix value. */

2
src/nix-build/nix-build.cc
View file

@ -309,7 +309,7 @@ static void _main(int argc, char * * argv)
state->eval(e, vRoot);
for (auto & i : attrPaths) {
Value & v(*findAlongAttrPath(*state, i, *autoArgs, vRoot));
Value & v(*findAlongAttrPath(*state, i, *autoArgs, vRoot).first);
state->forceValue(v);
getDerivations(*state, v, "", *autoArgs, drvs, false);
}

4
src/nix-env/nix-env.cc
View file

@ -178,7 +178,7 @@ static void loadDerivations(EvalState & state, Path nixExprPath,
Value vRoot;
loadSourceExpr(state, nixExprPath, vRoot);
Value & v(*findAlongAttrPath(state, pathPrefix, autoArgs, vRoot));
Value & v(*findAlongAttrPath(state, pathPrefix, autoArgs, vRoot).first);
getDerivations(state, v, pathPrefix, autoArgs, elems, true);
@ -408,7 +408,7 @@ static void queryInstSources(EvalState & state,
Value vRoot;
loadSourceExpr(state, instSource.nixExprPath, vRoot);
for (auto & i : args) {
Value & v(*findAlongAttrPath(state, i, *instSource.autoArgs, vRoot));
Value & v(*findAlongAttrPath(state, i, *instSource.autoArgs, vRoot).first);
getDerivations(state, v, "", *instSource.autoArgs, elems, true);
}
break;

2
src/nix-instantiate/nix-instantiate.cc
View file

@ -39,7 +39,7 @@ void processExpr(EvalState & state, const Strings & attrPaths,
state.eval(e, vRoot);
for (auto & i : attrPaths) {
Value & v(*findAlongAttrPath(state, i, autoArgs, vRoot));
Value & v(*findAlongAttrPath(state, i, autoArgs, vRoot).first);
state.forceValue(v);
PathSet context;

2
src/nix-prefetch-url/nix-prefetch-url.cc
View file

@ -120,7 +120,7 @@ static int _main(int argc, char * * argv)
Path path = resolveExprPath(lookupFileArg(*state, args.empty() ? "." : args[0]));
Value vRoot;
state->evalFile(path, vRoot);
Value & v(*findAlongAttrPath(*state, attrPath, autoArgs, vRoot));
Value & v(*findAlongAttrPath(*state, attrPath, autoArgs, vRoot).first);
state->forceAttrs(v);
/* Extract the URI. */

2
src/nix/flake.cc
View file

@ -348,7 +348,7 @@ struct CmdFlakeCheck : FlakeCommand
Activity act(*logger, lvlChatty, actUnknown,
fmt("checking NixOS configuration '%s'", attrPath));
Bindings & bindings(*state->allocBindings(0));
auto vToplevel = findAlongAttrPath(*state, "config.system.build.toplevel", bindings, v);
auto vToplevel = findAlongAttrPath(*state, "config.system.build.toplevel", bindings, v).first;
state->forceAttrs(*vToplevel, pos);
if (!state->isDerivation(*vToplevel))
throw Error("attribute 'config.system.build.toplevel' is not a derivation");

6
src/nix/installables.cc
View file

@ -250,7 +250,7 @@ struct InstallableAttrPath : InstallableValue
Value * toValue(EvalState & state) override
{
auto vRes = findAlongAttrPath(state, attrPath, *cmd.getAutoArgs(state), *v);
auto vRes = findAlongAttrPath(state, attrPath, *cmd.getAutoArgs(state), *v).first;
state.forceValue(*vRes);
return vRes;
}
@ -360,7 +360,7 @@ std::tuple<std::string, FlakeRef, flake::EvalCache::Derivation> InstallableFlake
vOutputs = getFlakeOutputs(*state, lockedFlake);
try {
auto * v = findAlongAttrPath(*state, attrPath, *emptyArgs, *vOutputs);
auto * v = findAlongAttrPath(*state, attrPath, *emptyArgs, *vOutputs).first;
state->forceValue(*v);
auto drvInfo = getDerivation(*state, *v, false);
@ -401,7 +401,7 @@ Value * InstallableFlake::toValue(EvalState & state)
for (auto & attrPath : getActualAttrPaths()) {
try {
auto * v = findAlongAttrPath(state, attrPath, *emptyArgs, *vOutputs);
auto * v = findAlongAttrPath(state, attrPath, *emptyArgs, *vOutputs).first;
state.forceValue(*v);
return v;
} catch (AttrPathNotFound & e) {

2
src/nix/upgrade-nix.cc
View file

@ -145,7 +145,7 @@ struct CmdUpgradeNix : MixDryRun, StoreCommand
auto v = state->allocValue();
state->eval(state->parseExprFromString(*res.data, "/no-such-path"), *v);
Bindings & bindings(*state->allocBindings(0));
auto v2 = findAlongAttrPath(*state, settings.thisSystem, bindings, *v);
auto v2 = findAlongAttrPath(*state, settings.thisSystem, bindings, *v).first;
return store->parseStorePath(state->forceString(*v2));
}