Created
July 3, 2018 05:39
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Rewrite Power Operator
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import macros | |
proc rewritePowerOp(node: NimNode): NimNode = | |
let funcIdent = node[1] | |
let repeatLit = node[2][0] | |
echo funcIdent | |
expectKind(repeatLit, nnkIntLit) | |
let call = newCall(funcIdent) | |
for i in 1 ..< node[2].len: | |
call.add(node[2][i]) | |
let stmts = newStmtList() | |
for i in 1 .. repeatLit.intVal: | |
let stmt = newNimNode(nnkDiscardStmt, node) | |
stmt.add(call) | |
stmts.add(stmt) | |
result = newBlockStmt(stmts) | |
proc findPowerOp(node: NimNode): NimNode = | |
if node.len < 1: | |
result = node | |
else: | |
result = node | |
for i in 0 ..< node.len: | |
echo node[i].kind | |
case node[i].kind | |
of nnkInfix: | |
case node[i][0].kind | |
of nnkIdent: | |
if $result[i][0] == "^": | |
result[i] = rewritePowerOp(node[i]) | |
else: | |
result[i] = findPowerOp(node[i]) | |
else: | |
result[i] = findPowerOp(node[i]) | |
macro altPowerSyntax(body: untyped): untyped = | |
return findPowerOp(body) | |
proc hexThingy(hex: string): string = | |
echo "hexify side effect" | |
return "hexify!" | |
proc foo(bar: int): int = | |
echo "another function" | |
return bar | |
altPowerSyntax: | |
hexThingy^4("hi") | |
foo^3(42) | |
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