Nim/tests/macros/tmacro5.nim at devel · googol-lab/Nim

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import macros,json

var decls{.compileTime.}: seq[NimNode] = @[]

var impls{.compileTime.}: seq[NimNode] = @[]

macro importImpl_forward(name, returns: untyped): untyped =

result = newNimNode(nnkEmpty)

var func_name = newNimNode(nnkAccQuoted)

func_name.add newIdentNode("import")

func_name.add name

var res = newNimNode(nnkProcDef)

res.add newNimNode(nnkPostfix)

res[0].add newIdentNode("*")

res[0].add func_name

res.add newNimNode(nnkEmpty)

res.add newNimNode(nnkFormalParams)

res[3].add returns

var p1 = newNimNode(nnkIdentDefs)

p1.add newIdentNode("dat")

p1.add newIdentNOde("JsonNode")

p1.add newNimNode(nnkEmpty)

res[3].add p1

var p2 = newNimNode(nnkIdentDefs)

p2.add newIdentNode("errors")

p2.add newNimNode(nnkVarTy)

p2.add newNimNode(nnkEmpty)

p2[1].add newNimNode(nnkBracketExpr)

p2[1][0].add newIdentNode("seq")

p2[1][0].add newIdentNode("string")

res[3].add p2

res.add newNimNode(nnkEmpty)

decls.add res

echo(repr(res))

macro importImpl(name, returns, body: untyped): typed =

#var res = getAST(importImpl_forward(name, returns))

discard getAST(importImpl_forward(name, returns))

var res = copyNimTree(decls[decls.high])

res[6] = body

echo repr(res)

impls.add res

macro okayy: typed =

result = newNimNode(nnkStmtList)

for node in decls: result.add node

for node in impls: result.add node

importImpl(Item, int):

echo 42

importImpl(Foo, int16):

echo 77

okayy

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