/***************************************************************************
* Function: AbsorbAnyBlanks
* Purpose:
* Update PLINE by making it point to the first non-blank
* at-or-after from but not after limit.
* If they are all blank then make it point to limit
* If from is non-blank then leave it alone.
* Return true iff PLINE was updated.
* It is legit for limit to be null (meaning end of file).*/
public static bool AbsorbAnyBlanks(ref Line from , Line limit, bool bMoveToNext )
{
bool progress = false;
while ( ( from != null ) && ( from.IsBlank() ) && ( from != limit ) ) {
if( bMoveToNext ) from = (Line)from.GetNext();
else from = (Line)from.GetPrev();
progress = true;
}
return progress;
}
/***************************************************************************
* Function: NextNonIgnorable
* Purpose:
* An ignorable line is a blank line with no link and isIgnoreBlanks set
* Given that line is initially not null and not ignorable:
* If line is the last line in the list then return null
* Else If isIgnoreBlanks is false then return the next line after line
* else return next line which has a link or which is non-blank.
* If there is no such line then return the last line in the list.
* Note that this does always make progress (at the cost of sometimes returning null). */
public static Line NextNonIgnorable(Line line,bool isIgnoreBlanks)
{
Line next = (Line)line.GetNext();
if (next==null) return null;
for(;;){
line = next;
if( line.link != null ) return line;
if( !isIgnoreBlanks ) return line;
if( !line.IsBlank() ) return line;
next = (Line)line.GetNext();
if( next == null ) return line;
}
}
/***************************************************************************
* Function: FindEndOfUnmatched
* Purpose:
* Returns a Line which is the last line in an unmatched section
* containing (probably starting with) Line.
* Note that it does not necessarily make progress.
* As noted above, even if blank lines are being ignored, we don't
* mind tagging them onto the end of an already unmatching section.
* This means we carry on until we find the first real link */
public static Line FindEndOfUnmatched(Line line)
{
for(;;){
Line next = (Line)line.GetNext();
if( next == null ) return line;
if( next.link != null ) return line;
line = next;
}
}