QTextCursor ScCodeEditor::selectionForPosition( int position )
{
QTextBlock block( textDocument()->findBlock(position) );
if (!block.isValid())
return QTextCursor();
int positionInBlock = position - block.position();
TokenIterator it = TokenIterator( block, positionInBlock );
if (it.type() == Token::Unknown) {
// Token is invalid, or Token::Unknown (i.e. punctuations).
// Prefer token at previous position.
TokenIterator alternativeIt = TokenIterator( block, positionInBlock - 1 );
if (alternativeIt.isValid())
it = alternativeIt;
}
if (it.isValid()) {
switch (it->type) {
case Token::OpeningBracket:
case Token::ClosingBracket:
{
BracketPair match;
matchBracket(it, match);
if (match.first.isValid() && match.second.isValid()) {
int start = match.first.position();
int end = match.second.position() + 1;
QTextCursor selection(textDocument());
if (it == match.second) {
selection.setPosition(start);
selection.setPosition(end, QTextCursor::KeepAnchor);
} else {
selection.setPosition(end);
selection.setPosition(start, QTextCursor::KeepAnchor);
}
return selection;
}
break;
}
default:
QTextCursor selection( textDocument() );
selection.setPosition( it.position() );
selection.setPosition( selection.position() + it->length, QTextCursor::KeepAnchor );
return selection;
}
}
return QTextCursor();
}
void ScCodeEditor::matchBracket( const TokenIterator & bracket, BracketPair & match )
{
Q_ASSERT(bracket.isValid());
switch(bracket->type) {
case Token::OpeningBracket:
match.first = bracket;
match.second = nextClosingBracket(bracket.next());
break;
case Token::ClosingBracket:
match.second = bracket;
match.first = previousOpeningBracket(bracket.previous());
break;
default:
match.first = TokenIterator();
match.second = TokenIterator();
}
}
void ScCodeEditor::matchBrackets()
{
mBracketSelections.clear();
QTextCursor cursor(textCursor());
QTextBlock block( cursor.block() );
int posInBlock = cursor.positionInBlock();
TokenIterator it(block);
while (it.isValid() && it.block() == block)
{
const Token & token = *it;
if (token.positionInBlock > posInBlock) {
it = TokenIterator();
break;
} else if (
(token.positionInBlock == posInBlock && token.type == Token::OpeningBracket) ||
(token.positionInBlock == posInBlock - 1 && token.type == Token::ClosingBracket)
)
break;
++it;
}
BracketPair match;
if( it.isValid() && it.block() == block)
matchBracket( it, match );
if( match.first.isValid() && match.second.isValid() )
{
const Token & tok1 = *match.first;
const Token & tok2 = *match.second;
if (
(tok1.character == '(' && tok2.character == ')')
|| (tok1.character == '[' && tok2.character == ']')
|| (tok1.character == '{' && tok2.character == '}')
){
QTextEdit::ExtraSelection selection;
selection.format = mBracketHighlight;
cursor.setPosition(match.first.position());
cursor.movePosition(QTextCursor::NextCharacter, QTextCursor::KeepAnchor);
selection.cursor = cursor;
mBracketSelections.append(selection);
cursor.setPosition(match.second.position());
cursor.movePosition(QTextCursor::NextCharacter, QTextCursor::KeepAnchor);
selection.cursor = cursor;
mBracketSelections.append(selection);
if (mHighlightBracketContents) {
QTextCharFormat format;
format.setBackground( mBracketHighlight.background() );
selection.format = format;
cursor.setPosition(match.first.position()+1);
cursor.setPosition(match.second.position(), QTextCursor::KeepAnchor);
selection.cursor = cursor;
mBracketSelections.append(selection);
}
}
else {
QTextEdit::ExtraSelection selection;
selection.format = mBracketMismatchFormat;
cursor.setPosition(match.first.position());
cursor.setPosition(match.second.position()+1, QTextCursor::KeepAnchor);
selection.cursor = cursor;
mBracketSelections.append(selection);
}
}
updateExtraSelections();
}
