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authorTodd Gamblin <tgamblin@llnl.gov>2020-12-22 10:49:36 -0800
committerGitHub <noreply@github.com>2020-12-22 19:49:36 +0100
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concretizer: refactor conditional rules to be less repetitious (#20507)
We have to repeat all the spec attributes in a number of places in `concretize.lp`, and Spack has a fair number of spec attributes. If we instead add some rules up front that establish equivalencies like this: ``` node(Package) :- attr("node", Package). attr("node", Package) :- node(Package). version(Package, Version) :- attr("version", Package, Version). attr("version", Package, Version) :- version(Package, Version). ``` We can rewrite most of the repetitive conditions with `attr` and repeat only for each arity (there are only 3 arities for spec attributes so far) as opposed to each spec attribute. This makes the logic easier to read and the rules easier to follow. Co-authored-by: Massimiliano Culpo <massimiliano.culpo@gmail.com>
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