Loosen ChangedMemberTarget diff evaluator and make ModelDiff a bit more flexible#2796
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JordonPhillips merged 3 commits intomainfrom Oct 28, 2025
Merged
Loosen ChangedMemberTarget diff evaluator and make ModelDiff a bit more flexible#2796JordonPhillips merged 3 commits intomainfrom
ChangedMemberTarget diff evaluator and make ModelDiff a bit more flexible#2796JordonPhillips merged 3 commits intomainfrom
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This introduces a builder to the Differences class that allows it to be constructed with only a specific, limited set of changes. This enables comparison of two separate shapes.
This adds a new, defaulted method to DiffEvaluator that additionally takes a ClassLoader. This may be used for a number of reasons, but was added particularly to allow running ModelDiff on synthetic changes from an evaluator.
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This updates the ChangedMemberTarget diff evaulator to emit a warning instead of an error when the new target has a different set of traits. It now is expected to only emit an error when the new target is not expected to be generated as a compatible type. The messages generally have been updated. It now generates messages about traits by generating a syntehtic ChangedShape and calling ModelDiff on that. This is also how it deals with knowing whether a trait change is compatible or not - it just checks if there's any DANGER or worse events in the new set of events.
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yasmewad
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This loosens the
ChangedMemberTargetdiff evaluator to not reportERRORlevel events so often. Now it will always report anERRORif the change is expected to result in codegen type errors, but otherwise it will default toWARNINGunless differing traits between the targets would result in a higher severity event had those trait changes been applied to the original target.This is accomplished by re-running
ModelDiffwith a set of synthetic changes, comparing the new and old targets as if they were the same shape that just got changed. To facilitate this,ModelDiffandDifferenceshad to be updated to allow running based on a curated list of changes rather than only allow running based on auto-detected changes.DiffEvaluatoralso had to be updated to allow passing along theClassLoader.By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.