void AeHighlighter::blockModified(QTextBlock block, unsigned column, unsigned added, unsigned removed) {
// We have to lock the mutex since a background thread may be
// attempting to update the StyleVector pointer
mutex_.lock();
for(int i = 0, N = styles_->value(block.blockNumber()).size(); i != N; ++i) {
AeCodeDecoration& ts = (*styles_)[block.blockNumber()][i];
AeCodeDecoration::Extents extents = ts.extents();
// if the highlight begins after our cursor position, advance
// or subtract it by the amount of characters changed
if(extents.start >= column)
extents.start += added - removed;
// if the highlight ends before our cursor position,
// leave it unchanged
else if(extents.start + extents.length <= column)
{}
// otherwise, we're in the middle of it. extend it. The normal
// highlighting algorithm will correct this later.
else
extents.length += added - removed;
ts.move(extents);
}
mutex_.unlock();
// We've changed the colours so have to rehighlight this line
rehighlightBlock(block);
}
// Changing of the start delimiter of a "here documnet" doesn't invoke
// highlightBlock() for the rest of it, hence the need for this slot.
// I don't like its complex logic but it works.
void Highlighter::docChanged (int pos, int, int)
{
QTextBlock block = qobject_cast< QTextDocument *>(parent())->findBlock (pos);
TextBlockData *data = static_cast<TextBlockData *>(block.userData());
/* at start or end (state = 7 or 0 or < 6),
or inside but previously at end (state = 6),
or outside but previously at start (state = 0 or < 6):
these are all states that we need to check */
if (data->isdelimiter())
{
/*******************************************************************
* It's important to know that this method is always called after *
* highlightBlock. There are three possibilities: state = 0, 6, 7. *
* Other values are, like 0, related to a block outside here-docs. *
*******************************************************************/
/* when we're inside a here-doc, go up to its header */
if (block.userState() == hereDocBodyState)
{
while (block.isValid())
{
block = block.previous();
if (block.userState() == hereDocHeaderState)
break;
}
}
/* when we're before, after or at end of a here-doc... */
if (block.userState() != hereDocHeaderState)
{
/* ... the header state of the next here-doc should be 7;
so, go to it and then do as for state 7 below */
block = block.next();
while (block.isValid() && block.userState() != hereDocHeaderState)
block = block.next();
}
/* when this is a header (state = 7)... */
if (block.isValid())
{
/* ... change the header state to 9 for this
here-doc to be rehighlighted completely
(for the highlighting downward 'wave' to go through it) */
delimState = hereDocTempState;
rehighlightBlock (block);
/* then reset its block states... */
resetHereDocStates (block);
/* ... and also reset the global header state */
delimState = hereDocHeaderState;
}
/* now, the header states of some here-docs
below this one may be 9; so, reset them */
block = block.next();
while (block.isValid())
{
while (block.isValid() && block.userState() != hereDocTempState)
block = block.next();
if (block.isValid())
{
resetHereDocStates (block);
block = block.next();
}
}
}
}
