This macro function automatically assigns parameters of method to local variables.
import haxe.macro.Context; import haxe.macro.Expr; using Lambda; class MyMacros { macro static public function initLocals():Expr { // Grab the variables accessible in the context the macro was called. var locals = Context.getLocalVars(); var fields = Context.getLocalClass().get().fields.get(); var exprs:Array<Expr> = []; for (local in locals.keys()) { if (fields.exists(function(field) return field.name == local)) { exprs.push(macro this.$local = $i{local}); } else { throw new Error(Context.getLocalClass() + " has no field " + local, Context.currentPos()); } } // Generates a block expression from the given expression array return macro $b{exprs}; } }
Usage
class Test { public var name:String; public var x:Float; public var y:Float; public function new(name:String, x:Float, y:Float) { MyMacros.initLocals(); } }
This will be the same as writing this manually:
class Test { public var name:String; public var x:Float; public var y:Float; public function new(name:String, x:Float, y:Float) { this.name = name; this.x = x; this.y = y; } }
