Reach reparsability of core pretty-printer#1181
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| lazy val externBodyTemplate: P[Template[Expr]] = | ||
| ( | ||
| (multilineString | stringLiteral) ~ | ||
| rep((`++` ~> expr) ~ (`++` ~> (multilineString | stringLiteral))) |
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I chose the syntax "string" ++ (<expr> ++ "string")* for extern body template strings because it is easy to parse. Open to to other suggestions!
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| case _: kiama.util.StringSource => "string" | ||
| case _ => "source" | ||
| } | ||
| "<>" <+> s"@ \"$scheme://$name\":$from:$to" |
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TODO: proper escaping
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| // FIXME: There is currently a limitation in TestRenamer in that it does not rename captures. | ||
| // This means, that in this example, captures for State[Int] and State[String] are both printed as "State", | ||
| // leading to a collapse of the capture set {State_1, State_2} to just {State}. | ||
| File("examples/pos/parametrized.effekt") |
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@marzipankaiser this is what I just mentioned in person.
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jiribenes
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I went over this in five minutes, see comments below. I'm fine with merging this if you need it (though it would be nice if somebody who actually knows something about core reviewed it)
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In #1181 we made the core pretty printer a lot more verbose in order to enable re-parsing. However, the additional verbosity hinders human inspection and debugging. This PR aims to mitigate this by splitting the core pretty printer in two instances: * `ReparsablePrettyPrinter` is fully verbose and can be re-parsed with `core.Parser` * `HumanReadablePrettyPrinter` is less verbose (and thus more readable) but cannot be re-parsed
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Currently, it is very hard to write tests for core. There are two main reasons for this:
While a new core frontend would subsume both of these problems, it is a lot more effort than adding a re-parsable mode to the current core pretty-printer. This would allow us to compile source programs to core and pretty-print them to use them as golden output in core tests.
In particular, when developing the new normalizer (#1127), I would like to track its behavior in unit tests, but they are currently very time-consuming to write due to the fact I cannot just use pretty-printed core for comparison.