char nextCh = reader.next();
if (nextCh == mathSymbol) {
text.append(mathSymbol);
}
else if (nextCh == '{') {
String expression = reader.readUntilSymbol('}').replace(" ", "");
if (expression.length() < 2) {
throw new SyntaxException("Can't parse expression: " + expression);
}
text.append(convertExpression(initialValue, expression));