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I've done a quick implementation using my scripting language; the parser is in parser.q at that link (auxiliary modules are lex.q for tokenising, and run.q to run the resulting program).
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Maybe something like Rosie?
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Instaparse sounds pretty close to what you're looking for assuming you're ok being limited to context-free grammars.
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Raku's grammar/parser file (don't look, it's not pretty; the RakuAST overhaul is set to allow for it to be significantly tidied up), weighs in at around 6KLoC. It contains some ancillary code and up to a half dozen grammars depending on how one counts them, with a lot of the fiddly, finely detailed code that comes with the territory if you care about things like great error messages (which is certainly the case in the Raku world).
