Main.hx

package;

import js.Lib;

/**
 * ...
 * @author Iskren Stanislavov
 */
 
@:build(MyMacro.build("sample"))
class Main 
{
	var a:Int = 4;
	var b:Int = 7;
	static function main() 
	{
		//trace(this.json);
//
		var me = new Main();
	}
	public function new()
	{
		trace(json);
		this.json.objectInObject;
		trace(json.arrayOfInts);
		if (!Reflect.hasField(this, "winSymbolIds"))
		{
			throw "Not yet";
		}
		trace("Horray");
	}
	
}

MyMacro.hx

package;
import haxe.Http;
import haxe.Json;
import haxe.macro.ComplexTypeTools;
import haxe.macro.Context;
import haxe.macro.Expr;
#if sys
import sys.io.File;
#end
import haxe.macro.Type.TFunc;
/**
 * ...
 * author Isko
 */
 
class MyMacro
{
	static public function build(jsonPath:String = ""):Array<Field>
	{
		var fields:Array<Field> = Context.getBuildFields();
		#if sys 
		jsonPath = jsonPath + ".json";
		var json = File.getContent(Context.resolvePath(jsonPath));
		#end
		

		var expr:Expr = Json.parse(json);
		//var jsonFields:Array<Field> = generateSubFields1(expr);
		//var jsonFields:Array<Field> = generateSubFields2(expr);
		var jsonFields:Array<Field> = generateSubFields3(expr);
		trace(jsonFields);
		//trace(Context.makeExpr(json, Context.currentPos()));
		
		fields.push({
			name : "json", //gids
			pos : Context.currentPos(),
			kind : FVar(TAnonymous( jsonFields )),//gtype
			access: [APrivate],
		});
		return fields;
	}

	#if macro
	private static function generateSubFields1(json:Dynamic):Array<Field>
	{
		var _pos: Position = Context.currentPos();
		return [ for (childName in Reflect.fields(json)) {
				"name": childName,
				"pos" : _pos,
				"kind": FVar(macro:Dynamic)
			}];
	}

	private static function generateSubFields2(json:Dynamic):Array<Field>
	{
		var _pos: Position = Context.currentPos();

		var fields:Array<Field> = [];
		for (childName in Reflect.fields(json))
		{
			var child:Dynamic = Reflect.field(json, childName);
			var childType = Type.typeof(child);

			//TODO: 
			//var jsonRepr:String = Json.stringify(child);
			var classOfChild = Type.getClass(child);
			trace(childName,classOfChild);
			switch(classOfChild){
				case Array:
					var arrType = Type.typeof(child[0]);
					fields.push({
						"name": childName,
						"pos" : _pos,
						//"kind": FVar(macro:Dynamic)
						//"kind": FVar(TAnonymous(generateSubFields2(child))),
						//"kind": TAnonymous(generateSubFields2(child)),
						//"kind": childType.toString(),
						//"kind": FVar(macro {childType.toString(); }),
						//"kind": FVar(macro Array<$v{arrType}>)
						"kind": FVar(macro: Array<Dynamic>)
					});
				default:
					fields.push({
						"name": childName,
						"pos" : _pos,
						//"kind": childType,
						"kind": FVar(macro:Dynamic)
					});
			}

		}
		return fields;
		//var jsonType:ComplexType = TAnonymous(fields);
		//return jsonType;
	}
	private static function generateSubFields3(json:Expr):Array<Field>
	{
		var fields:Array<Field> = [];
		
		var _pos: Position = Context.currentPos();

		var fields:Array<Field> = [];
		for (childName in Reflect.fields(json))
		{
			var child:Dynamic = Reflect.field(json, childName);
			var childType = Type.typeof(child);

			//TODO: 
			var jsonRepr:String = Json.stringify(child);
			var classOfChild = Type.getClass(child);

			switch(classOfChild){
				case Array:
					//var arrType = getTypeOfArray(child);
					//trace(new String(""+arrType));
					
					fields.push({
						"name": childName,
						"pos" : _pos,
						//"kind": arrType
						//"kind": FVar(TAnonymous(generateSubFields2(child))),
						//"kind": TAnonymous(generateSubFields2(child)),
						//"kind": childType.toString(),
						//"kind": FVar(macro {childType.expr; }),
					//"kind": FVar(null, macro $v(jsonRepr)),
						"kind": FVar(EArrayDecl([for (e in child.expr) e ]))
					});
				default:
					fields.push({
						"name": childName,
						"pos" : _pos,
						//"kind": childType,
						"kind": FVar(macro:Dynamic)
					});
			}

		}
		trace(fields);
		return fields;
		//var jsonType:ComplexType = TAnonymous(fields);
		//return jsonType;
	}
#end


}

sample.json

{"floatVar1":0.1, "str":"some string", "nullValueObject":null, "arrayOfInts":[11,20,9], "matrixLikeArray":[[14, 12, 13, 11, 18]], "floatMatrix":[[14.4, 12.3, 13.7, 11.9, 18.0]], "symbolPayouts":[0.05], "objectInObject":{"prop1":"some str", "prop2": "some str2", "prop3":10.17, "prop4":[[1,2,3],[19.3,20.4]]}}