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8623 :: Yet another macro DSL

• rb3 (orginal) [2021-11-14T12:31:29+01:00] view original

  If anyone was looking for yet another DSL for writing macros, here is a crappy one I just finished refactoring: https://github.com/n0bra1n3r/mast. Sample usage:

  import mast
  
  macro makeMain(body: untyped) =
    ast:
      ProcDef:
        `main`
        Empty
        Empty
        FormalParams:
          Empty
        Empty
        Empty
        (body)
  
  makeMain:
    echo "Hello world!"
  Run

  # `makeMain` expands to:
  proc main() =
    echo "Hello world!"
  Run

  Feel free to fork or just copy into your project. It's only ~60 lines long.

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• kobi (orginal) [2021-11-14T12:45:07+01:00] view original

  nice, but perhaps it's possible to have default arguments as Empty, and just call a nice api where you don't have to specify those? (in other words, don't rely on argument order etc, but show a high level api)

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• rb3 (orginal) [2021-11-14T12:54:42+01:00] view original

  Did you mean a higher-level API than ASTs? Maybe I can make a separate library for that, but this one is meant to reflect the output of treeRepr, so it follows Nim's abstract syntax tree representation closely. This is basically just sugar over normal newTree and newNimNode calls from std/macros.

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• planetis (orginal) [2021-11-14T15:06:23+01:00] view original

  Nice! Have you looked at fusion/astdsl btw?

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• PMunch (orginal) [2021-11-14T15:34:59+01:00] view original

  That was part of the idea behind `macroutils`. It doesn't set default arguments, but it creates procedures to create the various kinds of Nim nodes in a simplified way. You also have setters like e.g. left and right for infix nodes and body, pragmas, params etc. for procedure nodes.

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