Extensible syntax?

This page summarizes the projects mentioned and recommended in the original post on /r/ProgrammingLanguages

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  • wyvern

    The Wyvern programming language.

  • passerine

    A small extensible programming language designed for concise expression with little code.

    Seed7 and https://github.com/vrtbl/passerine (and seemingly more as others have suggested) have direct / first-class support of syntax declaration/definition in a homoiconic way, as powerful as LISPs, but feels more "natural" compared to a LISP.

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  • rumi

    The rumi compiler

    Yes, with rumi, here is an extreme example (look at other tests, they are nicer): https://github.com/MCSH/rumi/blob/master/tests/test8.rum

  • ww

    A "lexerless" (unified lexer) LALR(1) parser generator supporting dynamic grammar modification

NOTE: The number of mentions on this list indicates mentions on common posts plus user suggested alternatives. Hence, a higher number means a more popular project.

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