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import haxe.macro.Expr; | |
import haxe.macro.Context; | |
class FTW { | |
public static function build() { | |
return haxe.macro.Context.getBuildFields().map(transformField); | |
} | |
static function transformField(field:Field) { | |
switch (field.kind) { | |
case FFun(f): transformExpr(f.expr); | |
default: | |
} | |
return field; | |
} | |
static function transformExpr(expr:Expr) switch (expr) { | |
case macro @for($init, $cond, $incr) $block: | |
transformExpr(block); | |
expr.expr = makeLoop(init, cond, incr, block).expr; | |
default: | |
haxe.macro.ExprTools.iter(expr, transformExpr); | |
} | |
static function makeLoop(init:Expr, cond:Expr, incr:Expr, block:Expr) { | |
var outer:Array<Expr> = [], inner:Array<Expr> = []; | |
// adds expression(s) into given list (block): | |
function unroll(o:Expr, to:Array<Expr>) { | |
switch (o.expr) { | |
case EBlock(m): for (v in m) to.push(v); | |
default: to.push(o); | |
} | |
} | |
// inner (inside the for-loop) block: | |
inner.push(macro var _ = true); | |
inner.push({ | |
expr: ExprDef.EWhile(macro _ = false, block, false), | |
pos: block.pos | |
}); | |
inner.push(macro if (_) break); | |
unroll(incr, inner); | |
// outer (outside the for-loop) block: | |
unroll(init, outer); | |
outer.push({ | |
expr: ExprDef.EWhile(cond, { | |
expr: ExprDef.EBlock(inner), | |
pos: block.pos | |
}, true), | |
pos: block.pos | |
}); | |
// | |
return { | |
expr: ExprDef.EBlock(outer), | |
pos: init.pos | |
}; | |
} | |
} |
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@:build(FTW.build()) | |
class Main { | |
static function main() { | |
@for( { var i = 0, j = -5; } , i < 5 && j < 0, { i++; j++; } ) { | |
trace('Step $i, $j'); | |
} | |
} | |
} |
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The best you can do to approach the semicolons is around
... which is still pretty strange.
The general conclusion here is, that whatever you do about for-loops, they will never feel right.