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Generalized the auto complete of braces.

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This commit is contained in:
Roberto Raggi
2010-01-12 12:56:21 +01:00
parent 60c8686ed8
commit 92ed2daa6f
5 changed files with 253 additions and 214 deletions
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228
src/plugins/texteditor/basetexteditor.cpp
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@@ -183,6 +183,7 @@ BaseTextEditor::BaseTextEditor(QWidget *parent)
d->m_lastScrollPos = -1;
setCursorWidth(2);
d->m_allowSkippingOfBlockEnd = false;
// from RESEARCH
@@ -3555,23 +3556,236 @@ bool BaseTextEditor::isElectricCharacter(const QChar &) const
return false;
}
QString BaseTextEditor::autoComplete(QTextCursor &cursor, const QString &text) const
void BaseTextEditor::countBracket(QChar open, QChar close, QChar c, int *errors, int *stillopen)
{
Q_UNUSED(cursor);
Q_UNUSED(text);
return QString();
if (c == open)
++*stillopen;
else if (c == close)
--*stillopen;
if (*stillopen < 0) {
*errors += -1 * (*stillopen);
*stillopen = 0;
}
}
bool BaseTextEditor::autoBackspace(QTextCursor &cursor)
void BaseTextEditor::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();
}
}
bool BaseTextEditor::contextAllowsAutoParentheses(const QTextCursor &cursor,
const QString &textToInsert) const
{
Q_UNUSED(cursor);
Q_UNUSED(textToInsert);
return false;
}
bool BaseTextEditor::isInComment(const QTextCursor &cursor) const
{
Q_UNUSED(cursor);
return false;
}
QString BaseTextEditor::insertMatchingBrace(const QTextCursor &tc, const QString &text,
const QChar &la, int *skippedChars) const
{
Q_UNUSED(tc);
Q_UNUSED(text);
Q_UNUSED(la);
Q_UNUSED(skippedChars);
return QString();
}
QString BaseTextEditor::insertParagraphSeparator(const QTextCursor &tc) const
{
Q_UNUSED(tc);
return QString();
}
QString BaseTextEditor::autoComplete(QTextCursor &cursor, const QString &textToInsert) const
{
const bool checkBlockEnd = d->m_allowSkippingOfBlockEnd;
d->m_allowSkippingOfBlockEnd = false; // consume blockEnd.
if (!contextAllowsAutoParentheses(cursor, textToInsert))
return QString();
const QString text = textToInsert;
const QChar lookAhead = characterAt(cursor.selectionEnd());
QChar character = textToInsert.at(0);
const QString parentheses = QLatin1String("()");
const 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();
const QChar openChar = parentheses.contains(character) ? QLatin1Char('(') : QLatin1Char('[');
const 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
}
int skippedChars = 0;
const QString autoText = insertMatchingBrace(cursor, text, lookAhead, &skippedChars);
if (checkBlockEnd && textToInsert.at(0) == QLatin1Char('}')) {
if (textToInsert.length() > 1)
qWarning() << "*** handle event compression";
int startPos = cursor.selectionEnd(), pos = startPos;
while (characterAt(pos).isSpace())
++pos;
if (characterAt(pos) == QLatin1Char('}'))
skippedChars += (pos - startPos) + 1;
}
if (skippedChars) {
const int pos = cursor.position();
cursor.setPosition(pos + skippedChars);
cursor.setPosition(pos, QTextCursor::KeepAnchor);
}
return autoText;
}
bool BaseTextEditor::autoBackspace(QTextCursor &cursor)
{
d->m_allowSkippingOfBlockEnd = false;
int pos = cursor.position();
QTextCursor c = cursor;
c.setPosition(pos - 1);
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
}
// ### this code needs to be generalized
if ((lookBehind == QLatin1Char('(') && lookAhead == QLatin1Char(')'))
|| (lookBehind == QLatin1Char('[') && lookAhead == QLatin1Char(']'))
|| (lookBehind == QLatin1Char('"') && lookAhead == QLatin1Char('"')
&& lookFurtherBehind != QLatin1Char('\\'))
|| (lookBehind == QLatin1Char('\'') && lookAhead == QLatin1Char('\'')
&& lookFurtherBehind != QLatin1Char('\\'))) {
if (! isInComment(c)) {
cursor.beginEditBlock();
cursor.deleteChar();
cursor.deletePreviousChar();
cursor.endEditBlock();
return true;
}
}
return false;
}
int BaseTextEditor::paragraphSeparatorAboutToBeInserted(QTextCursor &cursor)
{
Q_UNUSED(cursor);
return 0;
if (characterAt(cursor.position()-1) != QLatin1Char('{'))
return 0;
if (!contextAllowsAutoParentheses(cursor))
return 0;
// verify that we indeed do have an extra opening brace in the document
int braceDepth = document()->lastBlock().userState();
if (braceDepth >= 0)
braceDepth >>= 8;
else
braceDepth= 0;
if (braceDepth <= 0)
return 0; // braces are all balanced or worse, no need to do anything
// we have an extra brace , let's see if we should close it
/* verify that the next block is not further intended compared to the current block.
This covers the following case:
if (condition) {|
statement;
*/
const TabSettings &ts = tabSettings();
QTextBlock block = cursor.block();
int indentation = ts.indentationColumn(block.text());
if (block.next().isValid()
&& ts.indentationColumn(block.next().text()) > indentation)
return 0;
int pos = cursor.position();
const QString textToInsert = insertParagraphSeparator(cursor);
cursor.insertText(textToInsert);
cursor.setPosition(pos);
if (ts.m_autoIndent) {
cursor.insertBlock();
indent(document(), cursor, QChar::Null);
} else {
QString previousBlockText = cursor.block().text();
cursor.insertBlock();
cursor.insertText(ts.indentationString(previousBlockText));
}
cursor.setPosition(pos);
d->m_allowSkippingOfBlockEnd = true;
return 1;
}
void BaseTextEditor::indentBlock(QTextDocument *, QTextBlock, QChar)