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authorstuebinm2021-04-10 22:59:07 +0200
committerstuebinm2021-04-10 22:59:07 +0200
commit2958333c83dce911463734e391fe3ccc76cfc9d5 (patch)
treef8b6a6370222f6f1053061f684c27ead563b7c74 /dhall_proc_macros/tests
parentc307b914eca192f8e8648345e365f9c0207bc18c (diff)
add type substitutions to serde_dhall
this adds subsititutions, which work similar to the `Dhall.substitutions` mechanism of the Haskell dhall package, and which can be used e.g. like this: ```rust serde_dhall.from_str(...) .substitute_names(hashmap!["Newtype" => static_type]) .parse::<SimpleType>()? ``` The idea behind this is to make it easy to add programmer-defined types which may be used in configs for programs, without forcing the program's users to re-import the same type definitions each time (or the programmers to keep the dhall-based definitions in sync with their rust types, since these are now generated automatically). Caveats so far: - makes some of the code ugly (dhall internals are now used in serde_dhall/src/lib.rs, for example) - haven't tested error messages so far - some unecessary copying of strings and static type values
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