Nim/tests/macros/tmacro2.nim at devel · googol-lab/Nim

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discard """

output: "ta-da Your value sir: 'HE!!!!o Wor!!d'"

"""

import macros, strutils

proc testBlock(): string {.compileTime.} =

block myBlock:

while true:

echo "inner block"

break myBlock

echo "outer block"

result = "ta-da"

macro mac(n: typed): string =

let n = callsite()

expectKind(n, nnkCall)

expectLen(n, 2)

expectKind(n[1], nnkStrLit)

var s: string = n[1].strVal

s = s.replace("l", "!!")

result = newStrLitNode("Your value sir: '$#'" % [s])

const s = testBlock()

const t = mac("HEllo World")

echo s, " ", t