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Nic KlaassenandTim Buckley
e20bc8afef
* feat: library for building predicate parsers Took some things I learned while building Login Rules and implemented a library that can be used to quickly implement new and improved predicate parsers. Copied from the package comment: typical (TYPed predICAte Library) is a library for building better predicate expression parsers faster. It is built on top of [predicate](github.com/gravitational/predicate). typical helps you (and forces you) to separate parse and evaluation into two distinct stages so that parsing can be cached and evaluation can be fast. Expressions can also be parsed to check their syntax without needing to evaluate them with some specific input. Functions can be defined by providing implementations accepting and returning values of ordinary types, the library handles the details that enable any function argument to be a subexpression that evaluates to the correct type. By default, typical provides strong type checking at parse time without any reflection during evaluation. If you define a function that evaluates to type any, you are opting in to evaluation-time type checking everywhere that function is called, but types will still be checked for all other parts of the expression. If you define a function that accepts an interface type it will be called via reflection during evaluation, but interface satisfaction is still checked at parse time. * fix typo in error message Co-authored-by: Tim Buckley <tim@goteleport.com> --------- Co-authored-by: Tim Buckley <tim@goteleport.com>