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qt-creator/src/plugins/texteditor/basetextdocumentlayout.cpp
Leandro Melo 3945b9a70f Editors: Make sure folded blocks remain consistent 
When folding indents change and a block becomes no longer
folded we need to update the user data. This patch tries
to handle general inconsistencies that might arise in such
situations. Notice however that there are stil other problems
to be addressed (including issues in Qt).

Task-number: QTCREATORBUG-5771
Change-Id: I38b869832159598d46cde00058308c218ca31f1a
Reviewed-on: http://codereview.qt.nokia.com/2908
Reviewed-by: Robert Löhning <robert.loehning@nokia.com>
Reviewed-by: Matthias Ettrich
2011-08-15 10:21:52 +02:00

644 lines
20 KiB
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/**************************************************************************
**
** This file is part of Qt Creator
**
** Copyright (c) 2011 Nokia Corporation and/or its subsidiary(-ies).
**
** Contact: Nokia Corporation (info@qt.nokia.com)
**
**
** GNU Lesser General Public License Usage
**
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this file.
** Please review the following information to ensure the GNU Lesser General
** Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** Other Usage
**
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
** If you have questions regarding the use of this file, please contact
** Nokia at info@qt.nokia.com.
**
**************************************************************************/
#include "basetextdocumentlayout.h"
using namespace TextEditor;
CodeFormatterData::~CodeFormatterData()
{
}
TextBlockUserData::~TextBlockUserData()
{
TextMarks marks = m_marks;
m_marks.clear();
foreach (ITextMark *mrk, marks) {
mrk->removedFromEditor();
}
if (m_codeFormatterData)
delete m_codeFormatterData;
}
int TextBlockUserData::braceDepthDelta() const
{
int delta = 0;
for (int i = 0; i < m_parentheses.size(); ++i) {
switch (m_parentheses.at(i).chr.unicode()) {
case '{': case '+': case '[': ++delta; break;
case '}': case '-': case ']': --delta; break;
default: break;
}
}
return delta;
}
TextBlockUserData::MatchType TextBlockUserData::checkOpenParenthesis(QTextCursor *cursor, QChar c)
{
QTextBlock block = cursor->block();
if (!BaseTextDocumentLayout::hasParentheses(block) || BaseTextDocumentLayout::ifdefedOut(block))
return NoMatch;
Parentheses parenList = BaseTextDocumentLayout::parentheses(block);
Parenthesis openParen, closedParen;
QTextBlock closedParenParag = block;
const int cursorPos = cursor->position() - closedParenParag.position();
int i = 0;
int ignore = 0;
bool foundOpen = false;
for (;;) {
if (!foundOpen) {
if (i >= parenList.count())
return NoMatch;
openParen = parenList.at(i);
if (openParen.pos != cursorPos) {
++i;
continue;
} else {
foundOpen = true;
++i;
}
}
if (i >= parenList.count()) {
for (;;) {
closedParenParag = closedParenParag.next();
if (!closedParenParag.isValid())
return NoMatch;
if (BaseTextDocumentLayout::hasParentheses(closedParenParag)
&& !BaseTextDocumentLayout::ifdefedOut(closedParenParag)) {
parenList = BaseTextDocumentLayout::parentheses(closedParenParag);
break;
}
}
i = 0;
}
closedParen = parenList.at(i);
if (closedParen.type == Parenthesis::Opened) {
ignore++;
++i;
continue;
} else {
if (ignore > 0) {
ignore--;
++i;
continue;
}
cursor->clearSelection();
cursor->setPosition(closedParenParag.position() + closedParen.pos + 1, QTextCursor::KeepAnchor);
if ((c == QLatin1Char('{') && closedParen.chr != QLatin1Char('}'))
|| (c == QLatin1Char('(') && closedParen.chr != QLatin1Char(')'))
|| (c == QLatin1Char('[') && closedParen.chr != QLatin1Char(']'))
|| (c == QLatin1Char('+') && closedParen.chr != QLatin1Char('-'))
)
return Mismatch;
return Match;
}
}
}
TextBlockUserData::MatchType TextBlockUserData::checkClosedParenthesis(QTextCursor *cursor, QChar c)
{
QTextBlock block = cursor->block();
if (!BaseTextDocumentLayout::hasParentheses(block) || BaseTextDocumentLayout::ifdefedOut(block))
return NoMatch;
Parentheses parenList = BaseTextDocumentLayout::parentheses(block);
Parenthesis openParen, closedParen;
QTextBlock openParenParag = block;
const int cursorPos = cursor->position() - openParenParag.position();
int i = parenList.count() - 1;
int ignore = 0;
bool foundClosed = false;
for (;;) {
if (!foundClosed) {
if (i < 0)
return NoMatch;
closedParen = parenList.at(i);
if (closedParen.pos != cursorPos - 1) {
--i;
continue;
} else {
foundClosed = true;
--i;
}
}
if (i < 0) {
for (;;) {
openParenParag = openParenParag.previous();
if (!openParenParag.isValid())
return NoMatch;
if (BaseTextDocumentLayout::hasParentheses(openParenParag)
&& !BaseTextDocumentLayout::ifdefedOut(openParenParag)) {
parenList = BaseTextDocumentLayout::parentheses(openParenParag);
break;
}
}
i = parenList.count() - 1;
}
openParen = parenList.at(i);
if (openParen.type == Parenthesis::Closed) {
ignore++;
--i;
continue;
} else {
if (ignore > 0) {
ignore--;
--i;
continue;
}
cursor->clearSelection();
cursor->setPosition(openParenParag.position() + openParen.pos, QTextCursor::KeepAnchor);
if ((c == '}' && openParen.chr != '{') ||
(c == ')' && openParen.chr != '(') ||
(c == ']' && openParen.chr != '[') ||
(c == '-' && openParen.chr != '+'))
return Mismatch;
return Match;
}
}
}
bool TextBlockUserData::findPreviousOpenParenthesis(QTextCursor *cursor, bool select)
{
QTextBlock block = cursor->block();
int position = cursor->position();
int ignore = 0;
while (block.isValid()) {
Parentheses parenList = BaseTextDocumentLayout::parentheses(block);
if (!parenList.isEmpty() && !BaseTextDocumentLayout::ifdefedOut(block)) {
for (int i = parenList.count()-1; i >= 0; --i) {
Parenthesis paren = parenList.at(i);
if (block == cursor->block() &&
(position - block.position() <= paren.pos + (paren.type == Parenthesis::Closed ? 1 : 0)))
continue;
if (paren.type == Parenthesis::Closed) {
++ignore;
} else if (ignore > 0) {
--ignore;
} else {
cursor->setPosition(block.position() + paren.pos, select ? QTextCursor::KeepAnchor : QTextCursor::MoveAnchor);
return true;
}
}
}
block = block.previous();
}
return false;
}
bool TextBlockUserData::findPreviousBlockOpenParenthesis(QTextCursor *cursor, bool checkStartPosition)
{
QTextBlock block = cursor->block();
int position = cursor->position();
int ignore = 0;
while (block.isValid()) {
Parentheses parenList = BaseTextDocumentLayout::parentheses(block);
if (!parenList.isEmpty() && !BaseTextDocumentLayout::ifdefedOut(block)) {
for (int i = parenList.count()-1; i >= 0; --i) {
Parenthesis paren = parenList.at(i);
if (paren.chr != QLatin1Char('{') && paren.chr != QLatin1Char('}')
&& paren.chr != QLatin1Char('+') && paren.chr != QLatin1Char('-')
&& paren.chr != QLatin1Char('[') && paren.chr != QLatin1Char(']'))
continue;
if (block == cursor->block()) {
if (position - block.position() <= paren.pos + (paren.type == Parenthesis::Closed ? 1 : 0))
continue;
if (checkStartPosition && paren.type == Parenthesis::Opened && paren.pos== cursor->position()) {
return true;
}
}
if (paren.type == Parenthesis::Closed) {
++ignore;
} else if (ignore > 0) {
--ignore;
} else {
cursor->setPosition(block.position() + paren.pos);
return true;
}
}
}
block = block.previous();
}
return false;
}
bool TextBlockUserData::findNextClosingParenthesis(QTextCursor *cursor, bool select)
{
QTextBlock block = cursor->block();
int position = cursor->position();
int ignore = 0;
while (block.isValid()) {
Parentheses parenList = BaseTextDocumentLayout::parentheses(block);
if (!parenList.isEmpty() && !BaseTextDocumentLayout::ifdefedOut(block)) {
for (int i = 0; i < parenList.count(); ++i) {
Parenthesis paren = parenList.at(i);
if (block == cursor->block() &&
(position - block.position() > paren.pos - (paren.type == Parenthesis::Opened ? 1 : 0)))
continue;
if (paren.type == Parenthesis::Opened) {
++ignore;
} else if (ignore > 0) {
--ignore;
} else {
cursor->setPosition(block.position() + paren.pos+1, select ? QTextCursor::KeepAnchor : QTextCursor::MoveAnchor);
return true;
}
}
}
block = block.next();
}
return false;
}
bool TextBlockUserData::findNextBlockClosingParenthesis(QTextCursor *cursor)
{
QTextBlock block = cursor->block();
int position = cursor->position();
int ignore = 0;
while (block.isValid()) {
Parentheses parenList = BaseTextDocumentLayout::parentheses(block);
if (!parenList.isEmpty() && !BaseTextDocumentLayout::ifdefedOut(block)) {
for (int i = 0; i < parenList.count(); ++i) {
Parenthesis paren = parenList.at(i);
if (paren.chr != QLatin1Char('{') && paren.chr != QLatin1Char('}')
&& paren.chr != QLatin1Char('+') && paren.chr != QLatin1Char('-')
&& paren.chr != QLatin1Char('[') && paren.chr != QLatin1Char(']'))
continue;
if (block == cursor->block() &&
(position - block.position() > paren.pos - (paren.type == Parenthesis::Opened ? 1 : 0)))
continue;
if (paren.type == Parenthesis::Opened) {
++ignore;
} else if (ignore > 0) {
--ignore;
} else {
cursor->setPosition(block.position() + paren.pos+1);
return true;
}
}
}
block = block.next();
}
return false;
}
TextBlockUserData::MatchType TextBlockUserData::matchCursorBackward(QTextCursor *cursor)
{
cursor->clearSelection();
const QTextBlock block = cursor->block();
if (!BaseTextDocumentLayout::hasParentheses(block) || BaseTextDocumentLayout::ifdefedOut(block))
return NoMatch;
const int relPos = cursor->position() - block.position();
Parentheses parentheses = BaseTextDocumentLayout::parentheses(block);
const Parentheses::const_iterator cend = parentheses.constEnd();
for (Parentheses::const_iterator it = parentheses.constBegin();it != cend; ++it) {
const Parenthesis &paren = *it;
if (paren.pos == relPos - 1
&& paren.type == Parenthesis::Closed) {
return checkClosedParenthesis(cursor, paren.chr);
}
}
return NoMatch;
}
TextBlockUserData::MatchType TextBlockUserData::matchCursorForward(QTextCursor *cursor)
{
cursor->clearSelection();
const QTextBlock block = cursor->block();
if (!BaseTextDocumentLayout::hasParentheses(block) || BaseTextDocumentLayout::ifdefedOut(block))
return NoMatch;
const int relPos = cursor->position() - block.position();
Parentheses parentheses = BaseTextDocumentLayout::parentheses(block);
const Parentheses::const_iterator cend = parentheses.constEnd();
for (Parentheses::const_iterator it = parentheses.constBegin();it != cend; ++it) {
const Parenthesis &paren = *it;
if (paren.pos == relPos
&& paren.type == Parenthesis::Opened) {
return checkOpenParenthesis(cursor, paren.chr);
}
}
return NoMatch;
}
void TextBlockUserData::setCodeFormatterData(CodeFormatterData *data)
{
if (m_codeFormatterData)
delete m_codeFormatterData;
m_codeFormatterData = data;
}
void TextBlockUserData::addMark(ITextMark *mark)
{
int i = 0;
for ( ; i < m_marks.size(); ++i) {
if (mark->priority() < m_marks.at(i)->priority())
break;
}
m_marks.insert(i, mark);
}
BaseTextDocumentLayout::BaseTextDocumentLayout(QTextDocument *doc)
:QPlainTextDocumentLayout(doc) {
lastSaveRevision = 0;
hasMarks = 0;
maxMarkWidthFactor = 1.0;
m_requiredWidth = 0;
}
BaseTextDocumentLayout::~BaseTextDocumentLayout()
{
}
void BaseTextDocumentLayout::setParentheses(const QTextBlock &block, const Parentheses &parentheses)
{
if (parentheses.isEmpty()) {
if (TextBlockUserData *userData = testUserData(block))
userData->clearParentheses();
} else {
userData(block)->setParentheses(parentheses);
}
}
Parentheses BaseTextDocumentLayout::parentheses(const QTextBlock &block)
{
if (TextBlockUserData *userData = testUserData(block))
return userData->parentheses();
return Parentheses();
}
bool BaseTextDocumentLayout::hasParentheses(const QTextBlock &block)
{
if (TextBlockUserData *userData = testUserData(block))
return userData->hasParentheses();
return false;
}
bool BaseTextDocumentLayout::setIfdefedOut(const QTextBlock &block)
{
return userData(block)->setIfdefedOut();
}
bool BaseTextDocumentLayout::clearIfdefedOut(const QTextBlock &block)
{
if (TextBlockUserData *userData = testUserData(block))
return userData->clearIfdefedOut();
return false;
}
bool BaseTextDocumentLayout::ifdefedOut(const QTextBlock &block)
{
if (TextBlockUserData *userData = testUserData(block))
return userData->ifdefedOut();
return false;
}
int BaseTextDocumentLayout::braceDepthDelta(const QTextBlock &block)
{
if (TextBlockUserData *userData = testUserData(block))
return userData->braceDepthDelta();
return 0;
}
int BaseTextDocumentLayout::braceDepth(const QTextBlock &block)
{
int state = block.userState();
if (state == -1)
return 0;
return state >> 8;
}
void BaseTextDocumentLayout::setBraceDepth(QTextBlock &block, int depth)
{
int state = block.userState();
if (state == -1)
state = 0;
state = state & 0xff;
block.setUserState((depth << 8) | state);
}
void BaseTextDocumentLayout::changeBraceDepth(QTextBlock &block, int delta)
{
if (delta)
setBraceDepth(block, braceDepth(block) + delta);
}
void BaseTextDocumentLayout::setLexerState(const QTextBlock &block, int state)
{
if (state == 0) {
if (TextBlockUserData *userData = testUserData(block))
userData->setLexerState(0);
} else {
userData(block)->setLexerState(qMax(0,state));
}
}
int BaseTextDocumentLayout::lexerState(const QTextBlock &block)
{
if (TextBlockUserData *userData = testUserData(block))
return userData->lexerState();
return 0;
}
void BaseTextDocumentLayout::setFoldingIndent(const QTextBlock &block, int indent)
{
if (indent == 0) {
if (TextBlockUserData *userData = testUserData(block))
userData->setFoldingIndent(0);
} else {
userData(block)->setFoldingIndent(qMax(0,indent));
}
}
int BaseTextDocumentLayout::foldingIndent(const QTextBlock &block)
{
if (TextBlockUserData *userData = testUserData(block))
return userData->foldingIndent();
return 0;
}
void BaseTextDocumentLayout::changeFoldingIndent(QTextBlock &block, int delta)
{
if (delta)
setFoldingIndent(block, foldingIndent(block) + delta);
}
bool BaseTextDocumentLayout::canFold(const QTextBlock &block)
{
return (block.next().isValid() && foldingIndent(block.next()) > foldingIndent(block));
}
bool BaseTextDocumentLayout::isFolded(const QTextBlock &block)
{
if (TextBlockUserData *userData = testUserData(block))
return userData->folded();
return false;
}
void BaseTextDocumentLayout::setFolded(const QTextBlock &block, bool folded)
{
if (folded)
userData(block)->setFolded(true);
else {
if (TextBlockUserData *userData = testUserData(block))
return userData->setFolded(false);
}
}
void BaseTextDocumentLayout::doFoldOrUnfold(const QTextBlock& block, bool unfold)
{
if (!canFold(block))
return;
QTextBlock b = block.next();
int indent = foldingIndent(block);
while (b.isValid() && foldingIndent(b) > indent && (unfold || b.next().isValid())) {
b.setVisible(unfold);
b.setLineCount(unfold? qMax(1, b.layout()->lineCount()) : 0);
if (unfold) { // do not unfold folded sub-blocks
if (isFolded(b) && b.next().isValid()) {
int jndent = foldingIndent(b);
b = b.next();
while (b.isValid() && foldingIndent(b) > jndent)
b = b.next();
continue;
}
}
b = b.next();
}
setFolded(block, !unfold);
}
void BaseTextDocumentLayout::setRequiredWidth(int width)
{
int oldw = m_requiredWidth;
m_requiredWidth = width;
int dw = QPlainTextDocumentLayout::documentSize().width();
if (oldw > dw || width > dw)
emitDocumentSizeChanged();
}
QSizeF BaseTextDocumentLayout::documentSize() const
{
QSizeF size = QPlainTextDocumentLayout::documentSize();
size.setWidth(qMax((qreal)m_requiredWidth, size.width()));
return size;
}
BaseTextDocumentLayout::FoldValidator::FoldValidator()
: m_layout(0)
, m_requestDocUpdate(false)
, m_insideFold(0)
{}
void BaseTextDocumentLayout::FoldValidator::setup(BaseTextDocumentLayout *layout)
{
m_layout = layout;
}
void BaseTextDocumentLayout::FoldValidator::reset()
{
m_insideFold = 0;
m_requestDocUpdate = false;
}
void BaseTextDocumentLayout::FoldValidator::process(QTextBlock block)
{
if (!m_layout)
return;
const QTextBlock &previous = block.previous();
if (!previous.isValid())
return;
if ((BaseTextDocumentLayout::isFolded(previous)
&& !BaseTextDocumentLayout::canFold(previous))
|| (!BaseTextDocumentLayout::isFolded(previous)
&& BaseTextDocumentLayout::canFold(previous)
&& !block.isVisible())) {
BaseTextDocumentLayout::setFolded(previous, !BaseTextDocumentLayout::isFolded(previous));
}
if (BaseTextDocumentLayout::isFolded(previous) && !m_insideFold)
m_insideFold = BaseTextDocumentLayout::foldingIndent(block);
bool toggleVisibility = false;
if (m_insideFold) {
if (BaseTextDocumentLayout::foldingIndent(block) >= m_insideFold) {
if (block.isVisible())
toggleVisibility = true;
} else {
m_insideFold = 0;
if (!block.isVisible())
toggleVisibility = true;
}
} else if (!block.isVisible()) {
toggleVisibility = true;
}
if (toggleVisibility) {
block.setVisible(!block.isVisible());
block.setLineCount(block.isVisible() ? qMax(1, block.layout()->lineCount()) : 0);
m_requestDocUpdate = true;
}
}
void BaseTextDocumentLayout::FoldValidator::finalize()
{
if (m_requestDocUpdate && m_layout) {
m_layout->requestUpdate();
m_layout->emitDocumentSizeChanged();
}
}
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