??= op

hscript/Interp.hx

@@ -162,7 +162,7 @@ class Interp {
 		binops.set("&&", function(e1, e2) return me.expr(e1) == true && me.expr(e2) == true);
 		binops.set("=", assign);
 		binops.set("??", function(e1, e2) {
-			var expr1:Dynamic = me.expr(e1); // I dont think most people have the new haxe syntax so im being safe
+			var expr1:Dynamic = me.expr(e1);
 			return expr1 == null ? me.expr(e2) : expr1;
 		});
 		binops.set("...", function(e1, e2) return new
@@ -183,6 +183,7 @@ class Interp {
 		assignOp(">>=", function(v1, v2) return v1 >> v2);
 		assignOp(">>>=", function(v1, v2) return v1 >>> v2);
 		assignOp("is", function(v1, v2) return Std.isOfType(v1, v2));
+		assignOp("??=", function(v1, v2) return v1 == null ? v2 : v1);
 	}
 
 	function setVar(name:String, v:Dynamic) {

hscript/Parser.hx

@@ -124,8 +124,8 @@ class Parser {
 			["..."],
 			["&&"],
 			["||"],
-			["=","+=","-=","*=","/=","%=","<<=",">>=",">>>=","|=","&=","^=","=>"],
-			["->"],
+			["=","+=","-=","*=","/=","%=","<<=",">>=",">>>=","|=","&=","^=","=>","??="],
+			["->", "??"],
 			["is"]
 		];
 		#if haxe3
@@ -1749,10 +1749,18 @@ class Parser {
 			case "'".code, '"'.code: return TConst( CString(readString(char)) );
 			case "?".code:
 				char = readChar();
-				if( char == '?'.code )
-					return TOp("??");
-				else if ( char == '.'.code )
-					return TQuestionDot;
+				switch (char) {
+					case '?'.code:
+						var orp = readPos;
+						if (readChar() == '='.code)
+							return TOp("??=");
+
+						this.readPos = orp;
+						return TOp("??");
+					case '.'.code:
+						return TQuestionDot;
+				}
+					
 				this.char = char;
 				return TQuestion;
 			case ":".code: return TDoubleDot;