Fix C++ with trigraphs

Author: gamerbross

TestHScript.hx

@@ -147,8 +147,13 @@ class TestHScript extends TestCase {
 		assertScript("pt2null?.pt?.x ?? 5", 5, vars);
 		assertScript("pt2?.pt ?? 5", pt, vars);
 		assertScript("pt2?.pt?.x ?? 5", 10, vars);
+		#if cpp
+		assertScript('valuenull ??${"="} 5; valuenull', 5, vars);
+		assertScript('value ??${"="} 5; value', 10, vars);
+		#else
 		assertScript("valuenull ??= 5; valuenull", 5, vars);
 		assertScript("value ??= 5; value", 10, vars);
+		#end
 	}
 
 	function testIsOperator():Void {

hscript/Interp.hx

@@ -122,7 +122,7 @@ class Interp {
 		assignOp("*=",function(v1:Float,v2:Float) return v1 * v2);
 		assignOp("/=",function(v1:Float,v2:Float) return v1 / v2);
 		assignOp("%=",function(v1:Float,v2:Float) return v1 % v2);
-		assignOp("??=",function(v1:Dynamic,v2:Dynamic) if ( v1 == null ) return v1 = v2 else return v1);
+		assignOp(#if cpp "??"+"=" #else "??=" #end,function(v1:Dynamic,v2:Dynamic) if ( v1 == null ) return v1 = v2 else return v1);
 		assignOp("&=",function(v1,v2) return v1 & v2);
 		assignOp("|=",function(v1,v2) return v1 | v2);
 		assignOp("^=",function(v1,v2) return v1 ^ v2);

hscript/Parser.hx

@@ -128,7 +128,7 @@ class Parser {
 			["..."],
 			["&&"],
 			["||"],
-			["=","+=","-=","*=","/=","%=","??=","<<=",">>=",">>>=","|=","&=","^=","=>"],
+			["=","+=","-=","*=","/=","%=",#if cpp "??"+"=" #else "??=" #end,"<<=",">>=",">>>=","|=","&=","^=","=>"],
 			["->"]
 		];
 		#if haxe3
@@ -1524,7 +1524,7 @@ class Parser {
 				else if ( char == "?".code ) {
 					char = readChar();
 					if ( char == "=".code )
-						return TOp("??=");
+						return TOp(#if cpp "??"+"=" #else "??=" #end);
 					return TQuestionQuestion;
 				}
 				this.char = char;