/// <summary>
/// Called so as to make the necessary decision making whilst the state machine is discarding code during a failed if
/// </summary>
/// <param name="sourceLine">source line under analysis</param>
/// <param name="sourceLineType">source code type as inspected by the Inspect function in the conditional inclusions machine</param>
/// <param name="expression">expression to be evaluated in case the source Line type is an elif</param>
/// <param name="subtitutionText"></param>
public void Process(ref string sourceLine, SourceLineType sourceLineType, string expression, string subtitutionText)
{
sourceLine = "";
switch (sourceLineType)
{
case SourceLineType.Ifclause:
case SourceLineType.Ifdefclause:
case SourceLineType.Ifndefclause:
/*
* In case we encounter an other if whilst discarding we add an other layer
* so as to keep the matching endif clauses.
*
* The reason why we push DiscardingDueToSuccessfullIf is to suppress any
* attempt any elif and else at this level.
*/
_conditionalInclusionsMachine.AddState(ParserState.DiscardingDueToSuccessfullIf);
break;
case SourceLineType.Elifclause:
switch (_conditionalInclusionsMachine.Evaluator.EvaluateExpression(expression, _conditionalInclusionsMachine.DefinesHandler))
{
case EvaluationResult.IsFalse:
/*
* in case the evaluation failed the state remains the same. We just
* continue discarding.
*/
break;
case EvaluationResult.IsTrue:
/*
* in case the evaluation is successfull we just change the state of
* the current level
*/
_conditionalInclusionsMachine.UpdateCurrentState(ParserState.IncludingDueToIf);
break;
case EvaluationResult.UnDetermined:
throw new SourceDiscoveryException(string.Format(CultureInfo.InvariantCulture, "Unable to evaluate expression \"{0}\"", expression));
}
break;
case SourceLineType.Elseclause:
_conditionalInclusionsMachine.UpdateCurrentState(ParserState.IncludingDueToIf);
break;
case SourceLineType.Endifclause:
_conditionalInclusionsMachine.FinishWithCurrentState();
break;
}
}
/// <summary>
/// Called so as to make the necessary decision making when a positively evaluated conditional has been met
/// </summary>
/// <param name="sourceLine">source line under analysis that may or may not be filtered</param>
/// <param name="sourceLineType">source code type as inspected by the Inspect function in the conditional inclusions machine</param>
/// <param name="expression">expression to be evaluated in case the source Line type is a conditional based on an expression</param>
/// <param name="subtitutionText">substitution text in case of a define</param>
public void Process(ref string sourceLine, SourceLineType sourceLineType, string expression, string subtitutionText)
{
switch (sourceLineType)
{
case SourceLineType.Other:
//Encountered source code NOT related to the conditional inclusions.
break;
case SourceLineType.Elifclause:
//since we were in successfull if inclusion and now we met an elif we have to discard anything in the elif
_conditionalInclusionsMachine.UpdateCurrentState(ParserState.DiscardingDueToSuccessfullIf);
sourceLine = "";
break;
case SourceLineType.Elseclause:
_conditionalInclusionsMachine.UpdateCurrentState(ParserState.DiscardingDueToSuccessfullIf);
sourceLine = "";
break;
case SourceLineType.Endifclause:
_conditionalInclusionsMachine.FinishWithCurrentState();
sourceLine = "";
break;
case SourceLineType.Ifclause:
switch (_conditionalInclusionsMachine.Evaluator.EvaluateExpression(expression, _conditionalInclusionsMachine.DefinesHandler))
{
case EvaluationResult.IsFalse:
_conditionalInclusionsMachine.AddState(ParserState.DiscardingDueToFailedIf);
break;
case EvaluationResult.IsTrue:
_conditionalInclusionsMachine.AddState(ParserState.IncludingDueToIf);
break;
case EvaluationResult.UnDetermined:
throw new SourceDiscoveryException(string.Format(CultureInfo.InvariantCulture, "Unable to evaluate expression \"{0}\"", expression));
}
sourceLine = "";
break;
case SourceLineType.MultiLineDefineclause:
_conditionalInclusionsMachine.AddState(ParserState.DiscardingDueToMultilineDefine);
_conditionalInclusionsMachine.DefinesHandler.Define(expression, "");
sourceLine = "";
break;
case SourceLineType.Defineclause:
_conditionalInclusionsMachine.DefinesHandler.Define(expression, subtitutionText);
sourceLine = "";
break;
case SourceLineType.Undefineclause:
_conditionalInclusionsMachine.DefinesHandler.UnDefine(expression);
sourceLine = "";
break;
case SourceLineType.Ifdefclause:
switch (_conditionalInclusionsMachine.DefinesHandler.IsDefined(expression))
{
case true:
_conditionalInclusionsMachine.AddState(ParserState.IncludingDueToIf);
break;
case false:
_conditionalInclusionsMachine.AddState(ParserState.DiscardingDueToFailedIf);
break;
}
sourceLine = "";
break;
case SourceLineType.Ifndefclause:
switch (_conditionalInclusionsMachine.DefinesHandler.IsDefined(expression))
{
case true:
_conditionalInclusionsMachine.AddState(ParserState.DiscardingDueToFailedIf);
break;
case false:
_conditionalInclusionsMachine.AddState(ParserState.IncludingDueToIf);
break;
}
sourceLine = "";
break;
}
}
public void Process(ref string sourceLine, SourceLineType sourceLineType, string expression, string subtitutionText)
{
switch (sourceLineType)
{
case SourceLineType.Ifdefclause:
switch (_conditionalInclusionsMachine.DefinesHandler.IsDefined(expression))
{
case true:
_conditionalInclusionsMachine.AddState(ParserState.IncludingDueToIf);
break;
case false:
_conditionalInclusionsMachine.AddState(ParserState.DiscardingDueToFailedIf);
break;
}
sourceLine = "";
break;
case SourceLineType.Ifndefclause:
switch (_conditionalInclusionsMachine.DefinesHandler.IsDefined(expression))
{
case true:
_conditionalInclusionsMachine.AddState(ParserState.DiscardingDueToFailedIf);
break;
case false:
_conditionalInclusionsMachine.AddState(ParserState.IncludingDueToIf);
break;
}
sourceLine = "";
break;
case SourceLineType.Ifclause:
switch (_conditionalInclusionsMachine.Evaluator.EvaluateExpression(expression, _conditionalInclusionsMachine.DefinesHandler))
{
case EvaluationResult.IsFalse:
_conditionalInclusionsMachine.AddState(ParserState.DiscardingDueToFailedIf);
break;
case EvaluationResult.IsTrue:
_conditionalInclusionsMachine.AddState(ParserState.IncludingDueToIf);
break;
case EvaluationResult.UnDetermined:
throw new SourceDiscoveryException(string.Format(CultureInfo.InvariantCulture, "Unable to evaluate expression \"{0}\"", expression));
}
sourceLine = "";
break;
case SourceLineType.MultiLineDefineclause:
_conditionalInclusionsMachine.AddState(ParserState.DiscardingDueToMultilineDefine);
_conditionalInclusionsMachine.DefinesHandler.Define(expression, "");
sourceLine = "";
break;
case SourceLineType.Defineclause:
_conditionalInclusionsMachine.DefinesHandler.Define(expression, subtitutionText);
sourceLine = "";
break;
case SourceLineType.Undefineclause:
_conditionalInclusionsMachine.DefinesHandler.UnDefine(expression);
sourceLine = "";
break;
case SourceLineType.Other:
//Encountered source code NOT related to the conditional inclusions.
break;
case SourceLineType.Elifclause:
// ReSharper disable once StringLiteralTypo
throw new SourceDiscoveryException("unexpected #elif found.");
case SourceLineType.Elseclause:
throw new SourceDiscoveryException("unexpected #else found.");
case SourceLineType.Endifclause:
throw new SourceDiscoveryException("unexpected #endif found.");
default:
throw new SourceDiscoveryException("unexpected conditional found. code " + sourceLineType);
}
}
