Created
September 27, 2024 01:16
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Error handling macros in nim
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| template `?`* [T](o: Option[T]) = | |
| block: | |
| if o.isNone: | |
| return none(T) | |
| o.get() | |
| macro R(T, F, p: untyped) = | |
| expectKind(p, nnkProcDef) | |
| p[3][0] = nnkBracketExpr.newTree(newIdentNode("Result"), T, F) | |
| let templateDefs = quote do: | |
| template Err(f: `F`): auto = | |
| Result[`T`, `F`].err(f) | |
| template Ok(t: `T`): auto = | |
| Result[`T`, `F`].ok(t) | |
| var body = p[^1] | |
| var newBody = newStmtList() | |
| newBody.add(templateDefs) | |
| for i in 0 ..< body.len: | |
| newBody.add(body[i]) | |
| p[^1] = newBody | |
| result = p |
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