toJSON: Add attribute path to trace

This commit is contained in:
Robert Hensing 2023-06-30 01:29:11 +02:00
parent 2d1d81114d
commit 33d58a90c2
4 changed files with 88 additions and 3 deletions

View file

@ -6,3 +6,5 @@
[`builtins.flakeRefToString`](@docroot@/language/builtins.md#builtins-flakeRefToString),
have been added.
These functions are useful for converting between flake references encoded as attribute sets and URLs.
- [`builtins.toJSON`](@docroot@/language/builtins.md#builtins-parseFlakeRef) now prints [--show-trace](@docroot@/command-ref/conf-file.html#conf-show-trace) items for the path in which it finds an evaluation error.

View file

@ -43,6 +43,7 @@ json printValueAsJSON(EvalState & state, bool strict,
break;
case nNull:
// already initialized as null
break;
case nAttrs: {
@ -59,7 +60,13 @@ json printValueAsJSON(EvalState & state, bool strict,
names.emplace(state.symbols[j.name]);
for (auto & j : names) {
Attr & a(*v.attrs->find(state.symbols.create(j)));
try {
out[j] = printValueAsJSON(state, strict, *a.value, a.pos, context, copyToStore);
} catch (Error & e) {
e.addTrace(state.positions[a.pos],
hintfmt("while evaluating attribute '%1%'", j));
throw;
}
}
} else
return printValueAsJSON(state, strict, *i->value, i->pos, context, copyToStore);
@ -68,8 +75,17 @@ json printValueAsJSON(EvalState & state, bool strict,
case nList: {
out = json::array();
for (auto elem : v.listItems())
int i = 0;
for (auto elem : v.listItems()) {
try {
out.push_back(printValueAsJSON(state, strict, *elem, pos, context, copyToStore));
} catch (Error & e) {
e.addTrace({},
hintfmt("while evaluating list element at index %1%", i));
throw;
}
i++;
}
break;
}

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@ -0,0 +1,57 @@
error:
… while calling the 'toJSON' builtin
at /pwd/lang/eval-fail-toJSON.nix:1:1:
1| builtins.toJSON {
| ^
2| a.b = [
… while evaluating attribute 'a'
at /pwd/lang/eval-fail-toJSON.nix:2:3:
1| builtins.toJSON {
2| a.b = [
| ^
3| true
… while evaluating attribute 'b'
at /pwd/lang/eval-fail-toJSON.nix:2:3:
1| builtins.toJSON {
2| a.b = [
| ^
3| true
… while evaluating list element at index 3
… while evaluating attribute 'c'
at /pwd/lang/eval-fail-toJSON.nix:7:7:
6| {
7| c.d = throw "hah no";
| ^
8| }
… while evaluating attribute 'd'
at /pwd/lang/eval-fail-toJSON.nix:7:7:
6| {
7| c.d = throw "hah no";
| ^
8| }
… while calling the 'throw' builtin
at /pwd/lang/eval-fail-toJSON.nix:7:13:
6| {
7| c.d = throw "hah no";
| ^
8| }
error: hah no

View file

@ -0,0 +1,10 @@
builtins.toJSON {
a.b = [
true
false
"it's a bird"
{
c.d = throw "hah no";
}
];
}