51 lines
1.4 KiB
Nim
51 lines
1.4 KiB
Nim
import std/macros
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proc replaceNodes(ast: NimNode, what: NimNode, by: NimNode): NimNode =
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# Replace "what" ident node by "by"
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proc inspect(node: NimNode): NimNode =
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case node.kind:
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of {nnkIdent, nnkSym}:
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if node.eqIdent(what):
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return by
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return node
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of nnkEmpty:
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return node
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of nnkLiterals:
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return node
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else:
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var rTree = node.kind.newTree()
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for child in node:
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rTree.add inspect(child)
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return rTree
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result = inspect(ast)
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macro staticFor*(idx: untyped{nkIdent}, start, stopEx: static int, body: untyped): untyped =
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result = newStmtList()
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for i in start ..< stopEx:
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result.add nnkBlockStmt.newTree(
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ident("unrolledIter_" & $idx & $i),
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body.replaceNodes(idx, newLit i)
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)
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{.experimental: "dynamicBindSym".}
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macro staticFor*(ident: untyped{nkIdent}, choices: typed, body: untyped): untyped =
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## matches
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## staticFor(curve, TestCurves):
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## body
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## and unroll the body for each curve in TestCurves
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let choices = if choices.kind == nnkSym:
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# Unpack symbol
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choices.getImpl()
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else:
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choices.expectKind(nnkBracket)
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choices
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result = newStmtList()
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for choice in choices:
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result.add nnkBlockStmt.newTree(
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ident($ident & "_" & $choice.intVal),
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body.replaceNodes(ident, choice)
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)
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