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macros for proc types, macros for types (#13778)

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* new minor feature: macros for proc types, to be documented

* Finished the implementation and added tests

* [skip ci] Describe the new custom pragmas in the manual and the changelog

Co-authored-by: Zahary Karadjov <zahary@gmail.com>
This commit is contained in:
Andreas Rumpf 2020-03-31 21:14:05 +02:00 • committed by GitHub
commit 9134bb9cfb
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7 changed files with 303 additions and 140 deletions
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6
lib/pure/asyncmacro.nim
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@ -212,6 +212,12 @@ proc verifyReturnType(typeName: string) {.compileTime.} =
proc asyncSingleProc(prc: NimNode): NimNode {.compileTime.} =
## This macro transforms a single procedure into a closure iterator.
## The ``async`` macro supports a stmtList holding multiple async procedures.
if prc.kind == nnkProcTy:
result = prc
if prc[0][0].kind == nnkEmpty:
result[0][0] = parseExpr("Future[void]")
return result
if prc.kind notin {nnkProcDef, nnkLambda, nnkMethodDef, nnkDo}:
error("Cannot transform this node kind into an async proc." &
" proc/method definition or lambda node expected.")