Add tests for string interpolation

Author: DleanJeans

Test.hx

@@ -96,6 +96,11 @@ class Test extends TestCase {
 		assertScript("var a:Array<Dynamic>=[1,2,4]; a[2]", 4, null, true);
 		assertScript("/**/0", 0);
 		assertScript("x=1;x*=-2", -2);
+		assertScript("'$$'", "$");
+		assertScript("'$x'", 10, { x:10 });
+		assertScript("'${x + 5}'", 15, { x:10 });
+		assertScript("'h$s'", "hscript", { s:"script" });
+		assertScript("'${function(x) {return x * x;}(3)}'", 9);
 	}
 
 	function testMap():Void {

hscript/Parser.hx

@@ -414,7 +414,7 @@ class Parser {
 					if (precedingSub != "")
 						exprs.push(mk(EConst(CString(precedingSub))));
 
-					while (depth >= 0) {
+					while (i < s.length) {
 						char = s.charAt(++i);
 						if (char == '{')
 							depth++;
@@ -445,7 +445,7 @@ class Parser {
 					exprs.push(mk(EIdent(ident)));
 					s = s.substr(i);
 			}
-			dollarIndex = s.indexOf('$');
+			dollarIndex = s.indexOf('$', i);
 		}
 
 		if (exprs.length == 0)