public void ConsumeIfDef(LookAheadLangParser parser)
{
Debug.Assert(Preprocessor.NextIsIfdef(parser));
while (!(parser.PeekNextKeyword().Equals("if") ||
parser.PeekNextKeyword().Equals("ifdef") ||
parser.PeekNextKeyword().Equals("def")))
{
ConumseNextKeyWordSpaceOutput();
}
ConumseNextKeyWordSpaceOutput();
}
public StreamReader Process()
{
try
{
Stack <bool> blockInclusion = new Stack <bool>();
blockInclusion.Push(true); // start by including next block of text
do
{
if (Preprocessor.NextIsIfdef(this.parser))
{
ConsumeIfDef(this.parser);
// if we are currently excluding a block, i.e nested #if's, just push 0 onto the inclusion
if (!blockInclusion.Peek())
{
blockInclusion.Push(false);
}
else
{
blockInclusion.Push(EvaluateExpression());
}
MoveToNextLineSpaceOutput();
}
else if (Preprocessor.NextIsElse(this.parser) && blockInclusion.Count > 1)
{
// just reverse the inclusion book-keeping
bool blockShouldInclude = blockInclusion.Pop();
// check if parent inclusing says no
if (!blockInclusion.Peek())
{
blockInclusion.Push(false);
}
else
{
blockInclusion.Push(!blockShouldInclude);
}
MoveToNextLineSpaceOutput();
}
else if (Preprocessor.NextIsEndif(this.parser) && blockInclusion.Count > 1)
{
blockInclusion.Pop();
MoveToNextLineSpaceOutput();
}
else if (Preprocessor.NextIsIfndef(this.parser))
{
ConsumeIfndef(this.parser);
if (!blockInclusion.Peek())
{
blockInclusion.Push(false);
}
else
{
blockInclusion.Push(!EvaluateExpression());
}
MoveToNextLineSpaceOutput();
}
else if (Preprocessor.NextIsCommentBlock(this.parser))
{
ConsumeComments();
}
else if (this.parser.PeekNextKeyword().Equals("#"))
{
ConsumeDirectiveMultiLine();
}
else
{
if (blockInclusion.Peek())
{
this.sb.Append(this.parser.NextKeyword());
}
else
{
ConumseNextKeyWordSpaceOutput(); // move the stream ahead without including its data...
}
}
}while (true);
}
catch (EndOfStreamException)
{
}
catch (Exception)
{
throw new PreprocessorException();
}
return(Preprocessor.GetTextStream(this.sb.ToString()));
}
