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RE-flex
Yet another high-performance C++ regex library and lexical analyzer generator like Flex: extends Flex++ with Unicode support, indent/dedent anchors, lazy quantifiers, functions for lex and syntax error reporting and more. Seamlessly integrates with Bison and other parsers. (by Genivia)
A Lua-to-Lisp transpiler written in Bison and RE/flex (a modern alternative to Flex for C++.) The transpiler translates Lua language constructs to Lisp. Dare I say that Lua is essentially sugared Lisp? A quote by Paul Graham comes to mind "As computers have grown more powerful, the new languages being developed have been moving steadily toward the Lisp model."
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Stream
Stream - Scalable APIs for Chat, Feeds, Moderation, & Video. Stream helps developers build engaging apps that scale to millions with performant and flexible Chat, Feeds, Moderation, and Video APIs and SDKs powered by a global edge network and enterprise-grade infrastructure.
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The translation rules are posed in the README of the project along with the Bison grammar and source code files: https://github.com/Robert-van-Engelen/lua-to-lisp
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When I hear "Lua to Lisp" I think of https://fennel-lang.org/