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Improve auto-inserting or deleting of parentheses and brackets

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When inserting or deleting ( or [, we now check wether this will improve
the block's parentheses balancing, and only fix it if it doesn't. Same
applies to skipping of ) or ].
This commit is contained in:
mae
2009-09-25 13:50:45 +02:00
parent e653b7054a
commit efed56c49e
1 changed files with 86 additions and 0 deletions
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86
src/plugins/cppeditor/cppeditor.cpp
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@@ -1323,6 +1323,39 @@ bool CPPEditor::isElectricCharacter(const QChar &ch) const
return false;
}
static void countBracket(QChar open, QChar close, QChar c, int *errors, int *stillopen)
{
if (c == open)
++*stillopen;
else if (c == close)
--*stillopen;
if (*stillopen < 0) {
*errors += -1 * (*stillopen);
*stillopen = 0;
}
}
void countBrackets(QTextCursor cursor, int from, int end, QChar open, QChar close, int *errors, int *stillopen)
{
cursor.setPosition(from);
QTextBlock block = cursor.block();
while (block.isValid() && block.position() < end) {
TextEditor::Parentheses parenList = TextEditor::TextEditDocumentLayout::parentheses(block);
if (!parenList.isEmpty() && !TextEditor::TextEditDocumentLayout::ifdefedOut(block)) {
for (int i = 0; i < parenList.count(); ++i) {
TextEditor::Parenthesis paren = parenList.at(i);
int position = block.position() + paren.pos;
if (position < from || position >= end)
continue;
countBracket(open, close, paren.chr, errors, stillopen);
}
}
block = block.next();
}
}
QString CPPEditor::autoComplete(QTextCursor &cursor, const QString &textToInsert) const
{
const bool checkBlockEnd = m_allowSkippingOfBlockEnd;
@@ -1334,6 +1367,33 @@ QString CPPEditor::autoComplete(QTextCursor &cursor, const QString &textToInsert
QString text = textToInsert;
const QChar lookAhead = characterAt(cursor.selectionEnd());
QChar character = textToInsert.at(0);
QString parentheses = QLatin1String("()");
QString brackets = QLatin1String("[]");
if (parentheses.contains(character) || brackets.contains(character)) {
QTextCursor tmp= cursor;
TextEditor::TextBlockUserData::findPreviousBlockOpenParenthesis(&tmp);
int blockStart = tmp.isNull() ? 0 : tmp.position();
tmp = cursor;
TextEditor::TextBlockUserData::findNextBlockClosingParenthesis(&tmp);
int blockEnd = tmp.isNull() ? (cursor.document()->characterCount()-1) : tmp.position();
QChar openChar = parentheses.contains(character) ? QLatin1Char('(') : QLatin1Char('[');
QChar closeChar = parentheses.contains(character) ? QLatin1Char(')') : QLatin1Char(']');
int errors = 0;
int stillopen = 0;
countBrackets(cursor, blockStart, blockEnd, openChar, closeChar, &errors, &stillopen);
int errorsBeforeInsertion = errors + stillopen;
errors = 0;
stillopen = 0;
countBrackets(cursor, blockStart, cursor.position(), openChar, closeChar, &errors, &stillopen);
countBracket(openChar, closeChar, character, &errors, &stillopen);
countBrackets(cursor, cursor.position(), blockEnd, openChar, closeChar, &errors, &stillopen);
int errorsAfterInsertion = errors + stillopen;
if (errorsAfterInsertion < errorsBeforeInsertion)
return QString(); // insertion fixes parentheses or bracket errors, do not auto complete
}
MatchingText matchingText;
int skippedChars = 0;
const QString autoText = matchingText.insertMatchingBrace(cursor, text, lookAhead, &skippedChars);
@@ -1370,6 +1430,32 @@ bool CPPEditor::autoBackspace(QTextCursor &cursor)
QChar lookAhead = characterAt(pos);
QChar lookBehind = characterAt(pos-1);
QChar lookFurtherBehind = characterAt(pos-2);
QChar character = lookBehind;
if (character == QLatin1Char('(') || character == QLatin1Char('[')) {
QTextCursor tmp = cursor;
TextEditor::TextBlockUserData::findPreviousBlockOpenParenthesis(&tmp);
int blockStart = tmp.isNull() ? 0 : tmp.position();
tmp = cursor;
TextEditor::TextBlockUserData::findNextBlockClosingParenthesis(&tmp);
int blockEnd = tmp.isNull() ? (cursor.document()->characterCount()-1) : tmp.position();
QChar openChar = character;
QChar closeChar = (character == QLatin1Char('(')) ? QLatin1Char(')') : QLatin1Char(']');
int errors = 0;
int stillopen = 0;
countBrackets(cursor, blockStart, blockEnd, openChar, closeChar, &errors, &stillopen);
int errorsBeforeDeletion = errors + stillopen;
errors = 0;
stillopen = 0;
countBrackets(cursor, blockStart, pos - 1, openChar, closeChar, &errors, &stillopen);
countBrackets(cursor, pos, blockEnd, openChar, closeChar, &errors, &stillopen);
int errorsAfterDeletion = errors + stillopen;
if (errorsAfterDeletion < errorsBeforeDeletion)
return false; // insertion fixes parentheses or bracket errors, do not auto complete
}
if ((lookBehind == QLatin1Char('(') && lookAhead == QLatin1Char(')'))
|| (lookBehind == QLatin1Char('[') && lookAhead == QLatin1Char(']'))
|| (lookBehind == QLatin1Char('"') && lookAhead == QLatin1Char('"')