private void WriteCondition(IVpcConditional value)
{
if (value.Negated)
{
_writer.Write('!');
}
switch (value)
{
case VpcConditionalCollection collection:
{
_writer.Write('(');
foreach (var item in collection)
{
WriteCondition(item);
}
_writer.Write(')');
break;
}
case VpcConditional conditional:
_writer.Write($"${conditional.Value}");
break;
default:
throw new ArgumentOutOfRangeException();
}
switch (value.Operator)
{
case VpcOperator.None:
break;
case VpcOperator.And:
_writer.Write(" && ");
break;
case VpcOperator.Or:
_writer.Write(" || ");
break;
default:
throw new ArgumentOutOfRangeException();
}
}
private void EndVariable()
{
if (_lastConditional == null)
{
return;
}
// negation
_lastConditional.Negated = _nextNegated;
// set its name
if (_lastConditional is VpcConditional conditional)
{
conditional.Value = _builder.ToString();
}
_builder.Clear();
_conditionalStack.Peek().Add(_lastConditional); // append to the next one up the stack
// reset
_nextNegated = false;
_lastConditional = null;
}
private void ReadCondition(char @char)
{
// ignore whitespace
if (char.IsWhiteSpace(@char))
{
return;
}
// operator
else if (@char == '&' || @char == '|')
{
// If we see any operator, set the operator of the last statement
if (NextChar() != @char)
{
throw new Exception("Invalid conditional operator!");
}
_lastConditional.Operator = (VpcOperator)@char;
// we can probably do it here
EndVariable();
}
// negation
else if (@char == '!')
{
_nextNegated = true;
}
// end
else if (@char == ']')
{
// Still characters left in the builder? Add one.
if (_builder.Length > 0)
{
EndVariable();
}
PopCurrentObject();
// pop the conditional
_conditionalStack.Pop();
// pop the state again to get out of the array
_stateStack.Pop();
}
// start of conditional sub-array
else if (@char == '(')
{
_conditionalStack.Push(new VpcConditionalCollection());
}
else if (@char == ')')
{
// end of conditional sub-array
EndVariable();
_lastConditional = _conditionalStack.Pop();
}
else if (@char == '$')
{
// start of variable also terminates the last variable
EndVariable();
_lastConditional = new VpcConditional(null, VpcOperator.None);
}
else
{
_builder.Append(@char);
}
}
