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c6a89c1a16
While preparing PRs like #9753, I've had to change error messages in dozens of code paths. It would be nice if instead of EvalError("expected 'boolean' but found '%1%'", showType(v)) we could write TypeError(v, "boolean") or similar. Then, changing the error message could be a mechanical refactor with the compiler pointing out places the constructor needs to be changed, rather than the error-prone process of grepping through the codebase. Structured errors would also help prevent the "same" error from having multiple slightly different messages, and could be a first step towards error codes / an error index. This PR reworks the exception infrastructure in `libexpr` to support exception types with different constructor signatures than `BaseError`. Actually refactoring the exceptions to use structured data will come in a future PR (this one is big enough already, as it has to touch every exception in `libexpr`). The core design is in `eval-error.hh`. Generally, errors like this: state.error("'%s' is not a string", getAttrPathStr()) .debugThrow<TypeError>() are transformed like this: state.error<TypeError>("'%s' is not a string", getAttrPathStr()) .debugThrow() The type annotation has moved from `ErrorBuilder::debugThrow` to `EvalState::error`.
50 lines
1.4 KiB
Text
50 lines
1.4 KiB
Text
error:
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… while calling the 'toJSON' builtin
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at /pwd/lang/eval-fail-toJSON.nix:1:1:
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1| builtins.toJSON {
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| ^
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2| a.b = [
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… while evaluating attribute 'a'
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at /pwd/lang/eval-fail-toJSON.nix:2:3:
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1| builtins.toJSON {
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2| a.b = [
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| ^
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3| true
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… while evaluating attribute 'b'
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at /pwd/lang/eval-fail-toJSON.nix:2:3:
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1| builtins.toJSON {
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2| a.b = [
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| ^
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3| true
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… while evaluating list element at index 3
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at /pwd/lang/eval-fail-toJSON.nix:2:3:
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1| builtins.toJSON {
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2| a.b = [
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| ^
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3| true
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… while evaluating attribute 'c'
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at /pwd/lang/eval-fail-toJSON.nix:7:7:
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6| {
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7| c.d = throw "hah no";
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| ^
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8| }
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… while evaluating attribute 'd'
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at /pwd/lang/eval-fail-toJSON.nix:7:7:
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6| {
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7| c.d = throw "hah no";
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| ^
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8| }
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… while calling the 'throw' builtin
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at /pwd/lang/eval-fail-toJSON.nix:7:13:
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6| {
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7| c.d = throw "hah no";
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| ^
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8| }
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error: hah no
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