Merge pull request #2 from lemz1/feature/null-coalescing

[FEATURE] ??= Operator

Author: EliteMasterEric

hscript/Interp.hx

@@ -110,6 +110,7 @@ class Interp {
 		assignOp("<<=",function(v1,v2) return v1 << v2);
 		assignOp(">>=",function(v1,v2) return v1 >> v2);
 		assignOp(">>>=",function(v1,v2) return v1 >>> v2);
+		assignOp("??=",function(v1,v2) return v1 ?? v2);
 	}
 
 	function setVar( name : String, v : Dynamic ) {

hscript/Parser.hx

@@ -118,7 +118,7 @@ class Parser {
 			["&&"],
 			["||"],
 			["??"],
-			["=","+=","-=","*=","/=","%=","<<=",">>=",">>>=","|=","&=","^=","=>"],
+			["=","+=","-=","*=","/=","%=","<<=",">>=",">>>=","??=","|=","&=","^=","=>"],
 			["->"],
 			["in","is"]
 		];
@@ -1610,8 +1610,12 @@ class Parser {
 				char = readChar();
 				if( char == ".".code )
 					return TQuestionDot;
-				if( char == "?".code )
+				if( char == "?".code ) {
+					char = readChar();
+					if ( char == "=".code )
+						return TOp("??=");
 					return TOp("??");
+				}
 				this.char = char;
 				return TQuestion;
 			case ":".code: return TDoubleDot;