/* Function: PreviousPastWhitespace
*
* Moves backwards until past all whitespace tokens or it reaches the limit. Returns whether it moved.
*
* Parameters:
*
* mode - If set to <PreviousPastWhitespaceMode.EndingBounds>, the iterator will move until the *previous* token is
* no longer whitespace, paying no attention to the token the iterator is on. This is useful if you're using it as the
* ending bounds relative to another iterator and want to trim trailing whitespace off.
*
* If set to <PreviousPastWhitespaceMode.Iterator>, the iterator will move until the *current* token is no longer
* whitespace. This is useful if you're using it as an independent iterator and want it to be on a non-whitespace
* token.
*/
public bool PreviousPastWhitespace(PreviousPastWhitespaceMode mode, TokenIterator limit)
{
if (mode == PreviousPastWhitespaceMode.Iterator)
{
if (FundamentalType != Tokenization.FundamentalType.Whitespace || this <= limit)
{
return(false);
}
do
{
Previous();
}while (FundamentalType == Tokenization.FundamentalType.Whitespace && this > limit);
return(true);
}
else if (mode == PreviousPastWhitespaceMode.EndingBounds)
{
TokenIterator temp = this;
temp.Previous();
if (temp.FundamentalType != FundamentalType.Whitespace || temp < limit)
{
return(false);
}
do
{
this = temp;
temp.Previous();
}while (temp.FundamentalType == FundamentalType.Whitespace && temp >= limit);
return(true);
}
else
{
throw new NotImplementedException();
}
}
/* Function: PreviousPastWhitespace
*
* Moves backwards until past all whitespace tokens or it reaches the limit.
*
* Parameters:
*
* mode - If set to <PreviousPastWhitespaceMode.EndingBounds>, the iterator will move until the *previous* token is
* no longer whitespace, paying no attention to the token the iterator is on. This is useful if you're using it as the
* ending bounds relative to another iterator and want to trim trailing whitespace off.
*
* If set to <PreviousPastWhitespaceMode.Iterator>, the iterator will move until the *current* token is no longer
* whitespace. This is useful if you're using it as an independent iterator and want it to be on a non-whitespace
* token.
*/
public void PreviousPastWhitespace(PreviousPastWhitespaceMode mode, TokenIterator limit)
{
if (mode == PreviousPastWhitespaceMode.Iterator)
{
while (FundamentalType == Tokenization.FundamentalType.Whitespace && this > limit)
{
Previous();
}
}
else if (mode == PreviousPastWhitespaceMode.EndingBounds)
{
TokenIterator temp = this;
temp.Previous();
while (temp.FundamentalType == FundamentalType.Whitespace && temp >= limit)
{
this = temp;
temp.Previous();
}
}
}
