Add code

ScriptConverter/Parser/Parselets/Statements/WhileParselet.cs

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+using ScriptConverter.Ast.Statements;
+
+namespace ScriptConverter.Parser.Parselets.Statements
+{
+    class WhileParselet : IStatementParselet
+    {
+        public Statement Parse(ScriptParser parser, ScriptToken token, out bool trailingSemicolon)
+        {
+            trailingSemicolon = false;
+
+            parser.Take(ScriptTokenType.LeftParen);
+            var condition = parser.ParseExpression();
+            parser.Take(ScriptTokenType.RightParen);
+
+            var block = parser.ParseBlock();
+
+            return new WhileStatement(token, parser.Previous, condition, block);
+        }
+    }
+}