public string Evaluate()
{
IExpressionNode root = new TextNode(null);
IExpressionNode node = root;
for (int i = 0; i < _expr.Length; i++)
{
IExpressionNode tmp = null;
switch (_expr[i])
{
case Tokens.VariableMark:
{
// the next character exists, and is '{'
if (i + 1 < _expr.Length && _expr[i + 1] == Tokens.VariableStart)
{
// skip '{' - it belongs to '$'
tmp = new VariableNode(node, Resolve);
i++;
}
else
{
node = node.Push(_expr[i]);
}
} break;
case Tokens.VariableStart:
if (!_options.HasFlag(Options.LegacyVariables))
{
throw new JcShellFormatException("Legacy variables format is not enabled!");
}
tmp = new VariableNode(node, Resolve);
break;
case Tokens.LengthMark:
tmp = new LengthNode(node);
break;
case Tokens.LengthBerMark:
tmp = new BerLengthNode(node);
break;
case Tokens.AsciiToHex:
if (node is AsciiToHexNode)
{
node = node.Parent;
}
else
{
tmp = new AsciiToHexNode(node);
}
break;
default:
node = node.Push(_expr[i]);
break;
}
if (tmp == null)
{
continue;
}
node.Push(tmp);
node = tmp;
}
return(root.Evaluate());
}