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webkit / WebKit / f4fe67f5e63d85d581f113f0c6c4832278878843 / . / WebCore / khtml / rendering / bidi.cpp
blob: cb00da74401ead2cf88148fa2f872e2e90173821 [file] [log] [blame]
/**
* This file is part of the html renderer for KDE.
*
* Copyright (C) 2000 Lars Knoll (knoll@kde.org)
* Copyright (C) 2003 Apple Computer, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*
*/
#include "bidi.h"
#include "break_lines.h"
#include "render_block.h"
#include "render_text.h"
#include "render_arena.h"
#include "xml/dom_docimpl.h"
#include "kdebug.h"
#include "qdatetime.h"
#include "qfontmetrics.h"
#define BIDI_DEBUG 0
//#define DEBUG_LINEBREAKS
namespace khtml {
// an iterator which goes through a BidiParagraph
struct BidiIterator
{
BidiIterator() : par(0), obj(0), pos(0) {}
BidiIterator(RenderBlock *_par, RenderObject *_obj, unsigned int _pos) : par(_par), obj(_obj), pos(_pos) {}
void increment( BidiState &bidi );
bool atEnd() const;
const QChar &current() const;
QChar::Direction direction() const;
RenderBlock *par;
RenderObject *obj;
unsigned int pos;
};
struct BidiStatus {
BidiStatus() : eor(QChar::DirON), lastStrong(QChar::DirON), last(QChar::DirON) {}
QChar::Direction eor;
QChar::Direction lastStrong;
QChar::Direction last;
};
struct BidiState {
BidiState() : context(0) {}
BidiIterator sor;
BidiIterator eor;
BidiIterator last;
BidiIterator current;
BidiContext *context;
BidiStatus status;
};
// Used to track a list of chained bidi runs.
static BidiRun* sFirstBidiRun;
static BidiRun* sLastBidiRun;
static int sBidiRunCount;
static BidiRun* sCompactFirstBidiRun;
static BidiRun* sCompactLastBidiRun;
static int sCompactBidiRunCount;
static bool sBuildingCompactRuns;
// Midpoint globals. The goal is not to do any allocation when dealing with
// these midpoints, so we just keep an array around and never clear it. We track
// the number of items and position using the two other variables.
static QMemArray<BidiIterator> *smidpoints;
static uint sNumMidpoints;
static uint sCurrMidpoint;
static bool betweenMidpoints;
static bool isLineEmpty = true;
static bool previousLineBrokeAtBR = true;
static QChar::Direction dir;
static bool adjustEmbeddding;
static bool emptyRun = true;
static int numSpaces;
static void embed( QChar::Direction d, BidiState &bidi );
static void appendRun( BidiState &bidi );
static int getBPMWidth(int childValue, Length cssUnit)
{
if (cssUnit.type != Variable)
return (cssUnit.type == Fixed ? cssUnit.value : childValue);
return 0;
}
static int getBorderPaddingMargin(RenderObject* child, bool endOfInline)
{
RenderStyle* cstyle = child->style();
int result = 0;
bool leftSide = (cstyle->direction() == LTR) ? !endOfInline : endOfInline;
result += getBPMWidth((leftSide ? child->marginLeft() : child->marginRight()),
(leftSide ? cstyle->marginLeft() :
cstyle->marginRight()));
result += getBPMWidth((leftSide ? child->paddingLeft() : child->paddingRight()),
(leftSide ? cstyle->paddingLeft() :
cstyle->paddingRight()));
result += leftSide ? child->borderLeft() : child->borderRight();
return result;
}
static int inlineWidth(RenderObject* child, bool start = true, bool end = true)
{
int extraWidth = 0;
RenderObject* parent = child->parent();
while (parent->isInline() && !parent->isInlineBlockOrInlineTable()) {
if (start && parent->firstChild() == child)
extraWidth += getBorderPaddingMargin(parent, false);
if (end && parent->lastChild() == child)
extraWidth += getBorderPaddingMargin(parent, true);
child = parent;
parent = child->parent();
}
return extraWidth;
}
#ifndef NDEBUG
static bool inBidiRunDetach;
#endif
void BidiRun::detach(RenderArena* renderArena)
{
#ifndef NDEBUG
inBidiRunDetach = true;
#endif
delete this;
#ifndef NDEBUG
inBidiRunDetach = false;
#endif
// Recover the size left there for us by operator delete and free the memory.
renderArena->free(*(size_t *)this, this);
}
void* BidiRun::operator new(size_t sz, RenderArena* renderArena) throw()
{
return renderArena->allocate(sz);
}
void BidiRun::operator delete(void* ptr, size_t sz)
{
assert(inBidiRunDetach);
// Stash size where detach can find it.
*(size_t*)ptr = sz;
}
static void deleteBidiRuns(RenderArena* arena)
{
if (!sFirstBidiRun)
return;
BidiRun* curr = sFirstBidiRun;
while (curr) {
BidiRun* s = curr->nextRun;
curr->detach(arena);
curr = s;
}
sFirstBidiRun = 0;
sLastBidiRun = 0;
sBidiRunCount = 0;
}
// ---------------------------------------------------------------------
/* a small helper class used internally to resolve Bidi embedding levels.
Each line of text caches the embedding level at the start of the line for faster
relayouting
*/
BidiContext::BidiContext(unsigned char l, QChar::Direction e, BidiContext *p, bool o)
: level(l) , override(o), dir(e)
{
parent = p;
if(p) {
p->ref();
basicDir = p->basicDir;
} else
basicDir = e;
count = 0;
}
BidiContext::~BidiContext()
{
if(parent) parent->deref();
}
void BidiContext::ref() const
{
count++;
}
void BidiContext::deref() const
{
count--;
if(count <= 0) delete this;
}
// ---------------------------------------------------------------------
inline bool operator==( const BidiIterator &it1, const BidiIterator &it2 )
{
if(it1.pos != it2.pos) return false;
if(it1.obj != it2.obj) return false;
return true;
}
inline bool operator!=( const BidiIterator &it1, const BidiIterator &it2 )
{
if(it1.pos != it2.pos) return true;
if(it1.obj != it2.obj) return true;
return false;
}
static inline RenderObject *Bidinext(RenderObject *par, RenderObject *current, BidiState &bidi,
bool skipInlines = true, bool* endOfInline = 0)
{
RenderObject *next = 0;
bool oldEndOfInline = endOfInline ? *endOfInline : false;
if (endOfInline)
*endOfInline = false;
while(current != 0)
{
//kdDebug( 6040 ) << "current = " << current << endl;
if (!oldEndOfInline && !current->isFloating() && !current->isReplaced() && !current->isPositioned()) {
next = current->firstChild();
if ( next && adjustEmbeddding ) {
EUnicodeBidi ub = next->style()->unicodeBidi();
if ( ub != UBNormal && !emptyRun ) {
EDirection dir = next->style()->direction();
QChar::Direction d = ( ub == Embed ? ( dir == RTL ? QChar::DirRLE : QChar::DirLRE )
: ( dir == RTL ? QChar::DirRLO : QChar::DirLRO ) );
embed( d, bidi );
}
}
}
if (!next) {
if (!skipInlines && !oldEndOfInline && current->isInlineFlow())
{
next = current;
if (endOfInline)
*endOfInline = true;
break;
}
while (current && current != par) {
next = current->nextSibling();
if (next) break;
if ( adjustEmbeddding && current->style()->unicodeBidi() != UBNormal && !emptyRun ) {
embed( QChar::DirPDF, bidi );
}
current = current->parent();
if (!skipInlines && current && current != par && current->isInlineFlow()) {
next = current;
if (endOfInline)
*endOfInline = true;
break;
}
}
}
if (!next) break;
if (next->isText() || next->isBR() || next->isFloating() || next->isReplaced() || next->isPositioned()
|| ((!skipInlines || !next->firstChild()) // Always return EMPTY inlines.
&& next->isInlineFlow()))
break;
current = next;
}
return next;
}
static RenderObject *first( RenderObject *par, BidiState &bidi, bool skipInlines = true )
{
if(!par->firstChild()) return 0;
RenderObject *o = par->firstChild();
if (o->isInlineFlow()) {
if (skipInlines && o->firstChild())
o = Bidinext( par, o, bidi, skipInlines );
else
return o; // Never skip empty inlines.
}
if (o && !o->isText() && !o->isBR() && !o->isReplaced() && !o->isFloating() && !o->isPositioned())
o = Bidinext( par, o, bidi, skipInlines );
return o;
}
inline void BidiIterator::increment (BidiState &bidi)
{
if(!obj) return;
if(obj->isText()) {
pos++;
if(pos >= static_cast<RenderText *>(obj)->stringLength()) {
obj = Bidinext( par, obj, bidi );
pos = 0;
}
} else {
obj = Bidinext( par, obj, bidi );
pos = 0;
}
}
inline bool BidiIterator::atEnd() const
{
if(!obj) return true;
return false;
}
const QChar &BidiIterator::current() const
{
if( !obj || !obj->isText()) {
static QChar nonBreakingSpace(0xA0);
return nonBreakingSpace;
}
return static_cast<RenderText *>(obj)->text()[pos];
}
inline QChar::Direction BidiIterator::direction() const
{
if(!obj || !obj->isText() ) return QChar::DirON;
RenderText *renderTxt = static_cast<RenderText *>( obj );
if ( pos >= renderTxt->stringLength() )
return QChar::DirON;
return renderTxt->text()[pos].direction();
}
// -------------------------------------------------------------------------------------------------
static void addRun(BidiRun* bidiRun)
{
if (!sFirstBidiRun)
sFirstBidiRun = sLastBidiRun = bidiRun;
else {
sLastBidiRun->nextRun = bidiRun;
sLastBidiRun = bidiRun;
}
sBidiRunCount++;
bidiRun->compact = sBuildingCompactRuns;
// Compute the number of spaces in this run,
if (bidiRun->obj && bidiRun->obj->isText()) {
RenderText* text = static_cast<RenderText*>(bidiRun->obj);
for (int i = bidiRun->start; i < bidiRun->stop; i++)
if (text->text()[i].unicode() == ' ')
numSpaces++;
}
}
static void reverseRuns(int start, int end)
{
if (start >= end)
return;
assert(start >= 0 && end < sBidiRunCount);
// Get the item before the start of the runs to reverse and put it in
// |beforeStart|. |curr| should point to the first run to reverse.
BidiRun* curr = sFirstBidiRun;
BidiRun* beforeStart = 0;
int i = 0;
while (i < start) {
i++;
beforeStart = curr;
curr = curr->nextRun;
}
BidiRun* startRun = curr;
while (i < end) {
i++;
curr = curr->nextRun;
}
BidiRun* endRun = curr;
BidiRun* afterEnd = curr->nextRun;
i = start;
curr = startRun;
BidiRun* newNext = afterEnd;
while (i <= end) {
// Do the reversal.
BidiRun* next = curr->nextRun;
curr->nextRun = newNext;
newNext = curr;
curr = next;
i++;
}
// Now hook up beforeStart and afterEnd to the newStart and newEnd.
if (beforeStart)
beforeStart->nextRun = endRun;
else
sFirstBidiRun = endRun;
startRun->nextRun = afterEnd;
if (!afterEnd)
sLastBidiRun = startRun;
}
static void checkMidpoints(BidiIterator& lBreak, BidiState &bidi)
{
// Check to see if our last midpoint is a start point beyond the line break. If so,
// shave it off the list, and shave off a trailing space if the previous end point isn't
// white-space: pre.
if (lBreak.obj && sNumMidpoints && sNumMidpoints%2 == 0) {
BidiIterator* midpoints = smidpoints->data();
BidiIterator& endpoint = midpoints[sNumMidpoints-2];
const BidiIterator& startpoint = midpoints[sNumMidpoints-1];
BidiIterator currpoint = endpoint;
while (!currpoint.atEnd() && currpoint != startpoint && currpoint != lBreak)
currpoint.increment( bidi );
if (currpoint == lBreak) {
// We hit the line break before the start point. Shave off the start point.
sNumMidpoints--;
if (endpoint.obj->style()->whiteSpace() != PRE)
endpoint.pos--;
}
}
}
static void addMidpoint(const BidiIterator& midpoint)
{
if (!smidpoints)
return;
if (smidpoints->size() <= sNumMidpoints)
smidpoints->resize(sNumMidpoints+10);
BidiIterator* midpoints = smidpoints->data();
midpoints[sNumMidpoints++] = midpoint;
}
static void appendRunsForObject(int start, int end, RenderObject* obj, BidiState &bidi)
{
if (start > end || obj->isFloating() ||
(obj->isPositioned() && !obj->hasStaticX() && !obj->hasStaticY()))
return;
bool haveNextMidpoint = (smidpoints && sCurrMidpoint < sNumMidpoints);
BidiIterator nextMidpoint;
if (haveNextMidpoint)
nextMidpoint = smidpoints->at(sCurrMidpoint);
if (betweenMidpoints) {
if (!(haveNextMidpoint && nextMidpoint.obj == obj))
return;
// This is a new start point. Stop ignoring objects and
// adjust our start.
betweenMidpoints = false;
start = nextMidpoint.pos;
sCurrMidpoint++;
if (start < end)
return appendRunsForObject(start, end, obj, bidi);
}
else {
if (!smidpoints || !haveNextMidpoint || (obj != nextMidpoint.obj)) {
addRun(new (obj->renderArena()) BidiRun(start, end, obj, bidi.context, dir));
return;
}
// An end midpoint has been encounted within our object. We
// need to go ahead and append a run with our endpoint.
if (int(nextMidpoint.pos+1) <= end) {
betweenMidpoints = true;
sCurrMidpoint++;
if (nextMidpoint.pos != UINT_MAX) { // UINT_MAX means stop at the object and don't include any of it.
addRun(new (obj->renderArena())
BidiRun(start, nextMidpoint.pos+1, obj, bidi.context, dir));
return appendRunsForObject(nextMidpoint.pos+1, end, obj, bidi);
}
}
else
addRun(new (obj->renderArena()) BidiRun(start, end, obj, bidi.context, dir));
}
}
static void appendRun( BidiState &bidi )
{
if ( emptyRun ) return;
#if BIDI_DEBUG > 1
kdDebug(6041) << "appendRun: dir="<<(int)dir<<endl;
#endif
bool b = adjustEmbeddding;
adjustEmbeddding = false;
int start = bidi.sor.pos;
RenderObject *obj = bidi.sor.obj;
while( obj && obj != bidi.eor.obj ) {
appendRunsForObject(start, obj->length(), obj, bidi);
start = 0;
obj = Bidinext( bidi.sor.par, obj, bidi );
}
if (obj)
appendRunsForObject(start, bidi.eor.pos+1, obj, bidi);
bidi.eor.increment( bidi );
bidi.sor = bidi.eor;
dir = QChar::DirON;
bidi.status.eor = QChar::DirON;
adjustEmbeddding = b;
}
static void embed( QChar::Direction d, BidiState &bidi )
{
#if BIDI_DEBUG > 1
qDebug("*** embed dir=%d emptyrun=%d", d, emptyRun );
#endif
bool b = adjustEmbeddding ;
adjustEmbeddding = false;
if ( d == QChar::DirPDF ) {
BidiContext *c = bidi.context->parent;
if (c) {
if ( bidi.eor != bidi.last ) {
appendRun( bidi );
bidi.eor = bidi.last;
}
appendRun( bidi );
emptyRun = true;
bidi.status.last = bidi.context->dir;
bidi.context->deref();
bidi.context = c;
if(bidi.context->override)
dir = bidi.context->dir;
else
dir = QChar::DirON;
bidi.status.lastStrong = bidi.context->dir;
}
} else {
QChar::Direction runDir;
if( d == QChar::DirRLE || d == QChar::DirRLO )
runDir = QChar::DirR;
else
runDir = QChar::DirL;
bool override;
if( d == QChar::DirLRO || d == QChar::DirRLO )
override = true;
else
override = false;
unsigned char level = bidi.context->level;
if ( runDir == QChar::DirR ) {
if(level%2) // we have an odd level
level += 2;
else
level++;
} else {
if(level%2) // we have an odd level
level++;
else
level += 2;
}
if(level < 61) {
if ( bidi.eor != bidi.last ) {
appendRun( bidi );
bidi.eor = bidi.last;
}
appendRun( bidi );
emptyRun = true;
bidi.context = new BidiContext(level, runDir, bidi.context, override);
bidi.context->ref();
if ( override )
dir = runDir;
bidi.status.last = runDir;
bidi.status.lastStrong = runDir;
}
}
adjustEmbeddding = b;
}
InlineFlowBox* RenderBlock::createLineBoxes(RenderObject* obj)
{
// See if we have an unconstructed line box for this object that is also
// the last item on the line.
KHTMLAssert(obj->isInlineFlow() || obj == this);
RenderFlow* flow = static_cast<RenderFlow*>(obj);
// Get the last box we made for this render object.
InlineFlowBox* box = flow->lastLineBox();
// If this box is constructed then it is from a previous line, and we need
// to make a new box for our line. If this box is unconstructed but it has
// something following it on the line, then we know we have to make a new box
// as well. In this situation our inline has actually been split in two on
// the same line (this can happen with very fancy language mixtures).
if (!box || box->isConstructed() || box->nextOnLine()) {
// We need to make a new box for this render object. Once
// made, we need to place it at the end of the current line.
InlineBox* newBox = obj->createInlineBox(false, obj == this);
KHTMLAssert(newBox->isInlineFlowBox());
box = static_cast<InlineFlowBox*>(newBox);
box->setFirstLineStyleBit(m_firstLine);
// We have a new box. Append it to the inline box we get by constructing our
// parent. If we have hit the block itself, then |box| represents the root
// inline box for the line, and it doesn't have to be appended to any parent
// inline.
if (obj != this) {
InlineFlowBox* parentBox = createLineBoxes(obj->parent());
parentBox->addToLine(box);
}
}
return box;
}
InlineFlowBox* RenderBlock::constructLine(const BidiIterator &start, const BidiIterator &end)
{
if (!sFirstBidiRun)
return 0; // We had no runs. Don't make a root inline box at all. The line is empty.
InlineFlowBox* parentBox = 0;
for (BidiRun* r = sFirstBidiRun; r; r = r->nextRun) {
// Create a box for our object.
r->box = r->obj->createInlineBox(r->obj->isPositioned(), false);
// If we have no parent box yet, or if the run is not simply a sibling,
// then we need to construct inline boxes as necessary to properly enclose the
// run's inline box.
if (!parentBox || (parentBox->object() != r->obj->parent()))
// Create new inline boxes all the way back to the appropriate insertion point.
parentBox = createLineBoxes(r->obj->parent());
// Append the inline box to this line.
parentBox->addToLine(r->box);
}
// We should have a root inline box. It should be unconstructed and
// be the last continuation of our line list.
KHTMLAssert(lastLineBox() && !lastLineBox()->isConstructed());
// Set bits on our inline flow boxes that indicate which sides should
// paint borders/margins/padding. This knowledge will ultimately be used when
// we determine the horizontal positions and widths of all the inline boxes on
// the line.
RenderObject* endObject = 0;
bool lastLine = !end.obj;
if (end.obj && end.pos == 0)
endObject = end.obj;
lastLineBox()->determineSpacingForFlowBoxes(lastLine, endObject);
// Now mark the line boxes as being constructed.
lastLineBox()->setConstructed();
// Return the last line.
return lastLineBox();
}
void RenderBlock::computeHorizontalPositionsForLine(InlineFlowBox* lineBox, BidiState &bidi)
{
// First determine our total width.
int totWidth = lineBox->getFlowSpacingWidth();
BidiRun* r = 0;
for (r = sFirstBidiRun; r; r = r->nextRun) {
if (r->obj->isPositioned())
continue; // Positioned objects are only participating to figure out their
// correct static x position. They have no effect on the width.
if (r->obj->isText())
r->box->setWidth(static_cast<RenderText *>(r->obj)->width(r->start, r->stop-r->start, m_firstLine));
else if (!r->obj->isInlineFlow()) {
r->obj->calcWidth();
r->box->setWidth(r->obj->width());
if (!r->compact)
totWidth += r->obj->marginLeft() + r->obj->marginRight();
}
// Compacts don't contribute to the width of the line, since they are placed in the margin.
if (!r->compact)
totWidth += r->box->width();
}
// Armed with the total width of the line (without justification),
// we now examine our text-align property in order to determine where to position the
// objects horizontally. The total width of the line can be increased if we end up
// justifying text.
int x = leftOffset(m_height);
int availableWidth = lineWidth(m_height);
switch(style()->textAlign()) {
case LEFT:
case KHTML_LEFT:
numSpaces = 0;
break;
case JUSTIFY:
if (numSpaces != 0 && !bidi.current.atEnd() && !bidi.current.obj->isBR() )
break;
// fall through
case TAAUTO:
numSpaces = 0;
// for right to left fall through to right aligned
if (bidi.context->basicDir == QChar::DirL)
break;
case RIGHT:
case KHTML_RIGHT:
x += availableWidth - totWidth;
numSpaces = 0;
break;
case CENTER:
case KHTML_CENTER:
int xd = (availableWidth - totWidth)/2;
x += xd >0 ? xd : 0;
numSpaces = 0;
break;
}
if (numSpaces > 0) {
for (r = sFirstBidiRun; r; r = r->nextRun) {
int spaceAdd = 0;
if (numSpaces > 0 && r->obj->isText() && !r->compact) {
// get the number of spaces in the run
int spaces = 0;
for ( int i = r->start; i < r->stop; i++ )
if ( static_cast<RenderText *>(r->obj)->text()[i].unicode() == ' ' )
spaces++;
KHTMLAssert(spaces <= numSpaces);
// Only justify text with white-space: normal.
if (r->obj->style()->whiteSpace() != PRE) {
spaceAdd = (availableWidth - totWidth)*spaces/numSpaces;
static_cast<InlineTextBox*>(r->box)->setSpaceAdd(spaceAdd);
totWidth += spaceAdd;
}
numSpaces -= spaces;
}
}
}
// The widths of all runs are now known. We can now place every inline box (and
// compute accurate widths for the inline flow boxes).
int rightPos = lineBox->placeBoxesHorizontally(x);
if (rightPos > m_overflowWidth)
m_overflowWidth = rightPos; // FIXME: Work for rtl overflow also.
}
void RenderBlock::computeVerticalPositionsForLine(InlineFlowBox* lineBox)
{
lineBox->verticallyAlignBoxes(m_height);
// See if the line spilled out. If so set overflow height accordingly.
int bottomOfLine = lineBox->bottomOverflow();
if (bottomOfLine > m_height && bottomOfLine > m_overflowHeight)
m_overflowHeight = bottomOfLine;
// Now make sure we place replaced render objects correctly.
for (BidiRun* r = sFirstBidiRun; r; r = r->nextRun) {
// Align positioned boxes with the top of the line box. This is
// a reasonable approximation of an appropriate y position.
if (r->obj->isPositioned())
r->box->setYPos(m_height);
// Position is used to properly position both replaced elements and
// to update the static normal flow x/y of positioned elements.
r->obj->position(r->box, r->start, r->stop - r->start, r->level%2);
}
}
// collects one line of the paragraph and transforms it to visual order
void RenderBlock::bidiReorderLine(const BidiIterator &start, const BidiIterator &end, BidiState &bidi)
{
if ( start == end ) {
if ( start.current() == '\n' ) {
m_height += lineHeight( m_firstLine, true );
}
return;
}
#if BIDI_DEBUG > 1
kdDebug(6041) << "reordering Line from " << start.obj << "/" << start.pos << " to " << end.obj << "/" << end.pos << endl;
#endif
sFirstBidiRun = 0;
sLastBidiRun = 0;
sBidiRunCount = 0;
// context->ref();
dir = QChar::DirON;
emptyRun = true;
numSpaces = 0;
bidi.current = start;
bidi.last = bidi.current;
bool atEnd = false;
while( 1 ) {
QChar::Direction dirCurrent;
if (atEnd) {
//kdDebug(6041) << "atEnd" << endl;
BidiContext *c = bidi.context;
if ( bidi.current.atEnd())
while ( c->parent )
c = c->parent;
dirCurrent = c->dir;
} else {
dirCurrent = bidi.current.direction();
}
#ifndef QT_NO_UNICODETABLES
#if BIDI_DEBUG > 1
kdDebug(6041) << "directions: dir=" << (int)dir << " current=" << (int)dirCurrent << " last=" << status.last << " eor=" << status.eor << " lastStrong=" << status.lastStrong << " embedding=" << (int)context->dir << " level =" << (int)context->level << endl;
#endif
switch(dirCurrent) {
// embedding and overrides (X1-X9 in the Bidi specs)
case QChar::DirRLE:
case QChar::DirLRE:
case QChar::DirRLO:
case QChar::DirLRO:
case QChar::DirPDF:
bidi.eor = bidi.last;
embed( dirCurrent, bidi );
break;
// strong types
case QChar::DirL:
if(dir == QChar::DirON)
dir = QChar::DirL;
switch(bidi.status.last)
{
case QChar::DirL:
bidi.eor = bidi.current; bidi.status.eor = QChar::DirL; break;
case QChar::DirR:
case QChar::DirAL:
case QChar::DirEN:
case QChar::DirAN:
appendRun( bidi );
break;
case QChar::DirES:
case QChar::DirET:
case QChar::DirCS:
case QChar::DirBN:
case QChar::DirB:
case QChar::DirS:
case QChar::DirWS:
case QChar::DirON:
if(dir != QChar::DirL) {
//last stuff takes embedding dir
if( bidi.context->dir == QChar::DirR ) {
if(!(bidi.status.eor == QChar::DirR)) {
// AN or EN
appendRun( bidi );
dir = QChar::DirR;
}
else
bidi.eor = bidi.last;
appendRun( bidi );
dir = QChar::DirL;
bidi.status.eor = QChar::DirL;
} else {
if(bidi.status.eor == QChar::DirR) {
appendRun( bidi );
dir = QChar::DirL;
} else {
bidi.eor = bidi.current; bidi.status.eor = QChar::DirL; break;
}
}
} else {
bidi.eor = bidi.current; bidi.status.eor = QChar::DirL;
}
default:
break;
}
bidi.status.lastStrong = QChar::DirL;
break;
case QChar::DirAL:
case QChar::DirR:
if(dir == QChar::DirON) dir = QChar::DirR;
switch(bidi.status.last)
{
case QChar::DirR:
case QChar::DirAL:
bidi.eor = bidi.current; bidi.status.eor = QChar::DirR; break;
case QChar::DirL:
case QChar::DirEN:
case QChar::DirAN:
appendRun( bidi );
dir = QChar::DirR;
bidi.eor = bidi.current;
bidi.status.eor = QChar::DirR;
break;
case QChar::DirES:
case QChar::DirET:
case QChar::DirCS:
case QChar::DirBN:
case QChar::DirB:
case QChar::DirS:
case QChar::DirWS:
case QChar::DirON:
if( !(bidi.status.eor == QChar::DirR) && !(bidi.status.eor == QChar::DirAL) ) {
//last stuff takes embedding dir
if(bidi.context->dir == QChar::DirR || bidi.status.lastStrong == QChar::DirR) {
appendRun( bidi );
dir = QChar::DirR;
bidi.eor = bidi.current;
bidi.status.eor = QChar::DirR;
} else {
bidi.eor = bidi.last;
appendRun( bidi );
dir = QChar::DirR;
bidi.status.eor = QChar::DirR;
}
} else {
bidi.eor = bidi.current; bidi.status.eor = QChar::DirR;
}
default:
break;
}
bidi.status.lastStrong = dirCurrent;
break;
// weak types:
case QChar::DirNSM:
// ### if @sor, set dir to dirSor
break;
case QChar::DirEN:
if(!(bidi.status.lastStrong == QChar::DirAL)) {
// if last strong was AL change EN to AN
if(dir == QChar::DirON) {
if(bidi.status.lastStrong == QChar::DirAL)
dir = QChar::DirAN;
else
dir = QChar::DirL;
}
switch(bidi.status.last)
{
case QChar::DirET:
if ( bidi.status.lastStrong == QChar::DirR || bidi.status.lastStrong == QChar::DirAL ) {
appendRun( bidi );
dir = QChar::DirEN;
bidi.status.eor = QChar::DirEN;
}
// fall through
case QChar::DirEN:
case QChar::DirL:
bidi.eor = bidi.current;
bidi.status.eor = dirCurrent;
break;
case QChar::DirR:
case QChar::DirAL:
case QChar::DirAN:
appendRun( bidi );
bidi.status.eor = QChar::DirEN;
dir = QChar::DirEN; break;
case QChar::DirES:
case QChar::DirCS:
if(bidi.status.eor == QChar::DirEN) {
bidi.eor = bidi.current; break;
}
case QChar::DirBN:
case QChar::DirB:
case QChar::DirS:
case QChar::DirWS:
case QChar::DirON:
if(bidi.status.eor == QChar::DirR) {
// neutrals go to R
bidi.eor = bidi.last;
appendRun( bidi );
dir = QChar::DirEN;
bidi.status.eor = QChar::DirEN;
}
else if( bidi.status.eor == QChar::DirL ||
(bidi.status.eor == QChar::DirEN && bidi.status.lastStrong == QChar::DirL)) {
bidi.eor = bidi.current; bidi.status.eor = dirCurrent;
} else {
// numbers on both sides, neutrals get right to left direction
if(dir != QChar::DirL) {
appendRun( bidi );
bidi.eor = bidi.last;
dir = QChar::DirR;
appendRun( bidi );
dir = QChar::DirEN;
bidi.status.eor = QChar::DirEN;
} else {
bidi.eor = bidi.current; bidi.status.eor = dirCurrent;
}
}
default:
break;
}
break;
}
case QChar::DirAN:
dirCurrent = QChar::DirAN;
if(dir == QChar::DirON) dir = QChar::DirAN;
switch(bidi.status.last)
{
case QChar::DirL:
case QChar::DirAN:
bidi.eor = bidi.current; bidi.status.eor = QChar::DirAN; break;
case QChar::DirR:
case QChar::DirAL:
case QChar::DirEN:
appendRun( bidi );
dir = QChar::DirAN; bidi.status.eor = QChar::DirAN;
break;
case QChar::DirCS:
if(bidi.status.eor == QChar::DirAN) {
bidi.eor = bidi.current; bidi.status.eor = QChar::DirR; break;
}
case QChar::DirES:
case QChar::DirET:
case QChar::DirBN:
case QChar::DirB:
case QChar::DirS:
case QChar::DirWS:
case QChar::DirON:
if(bidi.status.eor == QChar::DirR) {
// neutrals go to R
bidi.eor = bidi.last;
appendRun( bidi );
dir = QChar::DirAN;
bidi.status.eor = QChar::DirAN;
} else if( bidi.status.eor == QChar::DirL ||
(bidi.status.eor == QChar::DirEN && bidi.status.lastStrong == QChar::DirL)) {
bidi.eor = bidi.current; bidi.status.eor = dirCurrent;
} else {
// numbers on both sides, neutrals get right to left direction
if(dir != QChar::DirL) {
appendRun( bidi );
bidi.eor = bidi.last;
dir = QChar::DirR;
appendRun( bidi );
dir = QChar::DirAN;
bidi.status.eor = QChar::DirAN;
} else {
bidi.eor = bidi.current; bidi.status.eor = dirCurrent;
}
}
default:
break;
}
break;
case QChar::DirES:
case QChar::DirCS:
break;
case QChar::DirET:
if(bidi.status.last == QChar::DirEN) {
dirCurrent = QChar::DirEN;
bidi.eor = bidi.current; bidi.status.eor = dirCurrent;
break;
}
break;
// boundary neutrals should be ignored
case QChar::DirBN:
break;
// neutrals
case QChar::DirB:
// ### what do we do with newline and paragraph seperators that come to here?
break;
case QChar::DirS:
// ### implement rule L1
break;
case QChar::DirWS:
break;
case QChar::DirON:
break;
default:
break;
}
//cout << " after: dir=" << // dir << " current=" << dirCurrent << " last=" << status.last << " eor=" << status.eor << " lastStrong=" << status.lastStrong << " embedding=" << context->dir << endl;
if(bidi.current.atEnd()) break;
// set status.last as needed.
switch(dirCurrent)
{
case QChar::DirET:
case QChar::DirES:
case QChar::DirCS:
case QChar::DirS:
case QChar::DirWS:
case QChar::DirON:
switch(bidi.status.last)
{
case QChar::DirL:
case QChar::DirR:
case QChar::DirAL:
case QChar::DirEN:
case QChar::DirAN:
bidi.status.last = dirCurrent;
break;
default:
bidi.status.last = QChar::DirON;
}
break;
case QChar::DirNSM:
case QChar::DirBN:
// ignore these
break;
case QChar::DirEN:
if ( bidi.status.last == QChar::DirL ) {
bidi.status.last = QChar::DirL;
break;
}
// fall through
default:
bidi.status.last = dirCurrent;
}
#endif
if ( atEnd ) break;
bidi.last = bidi.current;
if ( emptyRun ) {
bidi.sor = bidi.current;
bidi.eor = bidi.current;
emptyRun = false;
}
// this causes the operator ++ to open and close embedding levels as needed
// for the CSS unicode-bidi property
adjustEmbeddding = true;
bidi.current.increment( bidi );
adjustEmbeddding = false;
if ( bidi.current == end ) {
if ( emptyRun )
break;
atEnd = true;
}
}
#if BIDI_DEBUG > 0
kdDebug(6041) << "reached end of line current=" << current.obj << "/" << current.pos
<< ", eor=" << eor.obj << "/" << eor.pos << endl;
#endif
if ( !emptyRun && bidi.sor != bidi.current ) {
bidi.eor = bidi.last;
appendRun( bidi );
}
// reorder line according to run structure...
// first find highest and lowest levels
uchar levelLow = 128;
uchar levelHigh = 0;
BidiRun *r = sFirstBidiRun;
while ( r ) {
if ( r->level > levelHigh )
levelHigh = r->level;
if ( r->level < levelLow )
levelLow = r->level;
r = r->nextRun;
}
// implements reordering of the line (L2 according to Bidi spec):
// L2. From the highest level found in the text to the lowest odd level on each line,
// reverse any contiguous sequence of characters that are at that level or higher.
// reversing is only done up to the lowest odd level
if( !(levelLow%2) ) levelLow++;
#if BIDI_DEBUG > 0
kdDebug(6041) << "lineLow = " << (uint)levelLow << ", lineHigh = " << (uint)levelHigh << endl;
kdDebug(6041) << "logical order is:" << endl;
QPtrListIterator<BidiRun> it2(runs);
BidiRun *r2;
for ( ; (r2 = it2.current()); ++it2 )
kdDebug(6041) << " " << r2 << " start=" << r2->start << " stop=" << r2->stop << " level=" << (uint)r2->level << endl;
#endif
int count = sBidiRunCount - 1;
// do not reverse for visually ordered web sites
if(!style()->visuallyOrdered()) {
while(levelHigh >= levelLow) {
int i = 0;
BidiRun* currRun = sFirstBidiRun;
while ( i < count ) {
while(i < count && currRun && currRun->level < levelHigh) {
i++;
currRun = currRun->nextRun;
}
int start = i;
while(i <= count && currRun && currRun->level >= levelHigh) {
i++;
currRun = currRun->nextRun;
}
int end = i-1;
reverseRuns(start, end);
i++;
if(i >= count) break;
}
levelHigh--;
}
}
#if BIDI_DEBUG > 0
kdDebug(6041) << "visual order is:" << endl;
for (BidiRun* curr = sFirstRun; curr; curr = curr->nextRun)
kdDebug(6041) << " " << curr << endl;
#endif
}
static void buildCompactRuns(RenderObject* compactObj, BidiState &bidi)
{
sBuildingCompactRuns = true;
if (!compactObj->isRenderBlock()) {
// Just append a run for our object.
isLineEmpty = false;
addRun(new (compactObj->renderArena()) BidiRun(0, compactObj->length(), compactObj, bidi.context, dir));
}
else {
// Format the compact like it is its own single line. We build up all the runs for
// the little compact and then reorder them for bidi.
RenderBlock* compactBlock = static_cast<RenderBlock*>(compactObj);
adjustEmbeddding = true;
BidiIterator start(compactBlock, first(compactBlock, bidi), 0);
adjustEmbeddding = false;
BidiIterator end = start;
betweenMidpoints = false;
isLineEmpty = true;
previousLineBrokeAtBR = true;
end = compactBlock->findNextLineBreak(start, bidi);
if (!isLineEmpty)
compactBlock->bidiReorderLine(start, end, bidi);
}
sCompactFirstBidiRun = sFirstBidiRun;
sCompactLastBidiRun = sLastBidiRun;
sCompactBidiRunCount = sBidiRunCount;
sNumMidpoints = 0;
sCurrMidpoint = 0;
betweenMidpoints = false;
sBuildingCompactRuns = false;
}
void RenderBlock::layoutInlineChildren(bool relayoutChildren)
{
BidiState bidi;
m_overflowHeight = 0;
invalidateVerticalPositions();
#ifdef DEBUG_LAYOUT
QTime qt;
qt.start();
kdDebug( 6040 ) << renderName() << " layoutInlineChildren( " << this <<" )" << endl;
#endif
#if BIDI_DEBUG > 1 || defined( DEBUG_LINEBREAKS )
kdDebug(6041) << " ------- bidi start " << this << " -------" << endl;
#endif
int toAdd = style()->borderBottomWidth();
m_height = style()->borderTopWidth();
m_height += paddingTop();
toAdd += paddingBottom();
// Clear out our line boxes.
deleteLineBoxes();
if (firstChild()) {
// layout replaced elements
bool endOfInline = false;
RenderObject *o = first( this, bidi, false );
while ( o ) {
if(o->isReplaced() || o->isFloating() || o->isPositioned()) {
//kdDebug(6041) << "layouting replaced or floating child" << endl;
if (relayoutChildren || o->style()->width().isPercent() || o->style()->height().isPercent())
o->setNeedsLayout(true);
if (o->isPositioned())
o->containingBlock()->insertPositionedObject(o);
else
o->layoutIfNeeded();
}
else if(o->isText()) { // FIXME: Should be able to combine deleteLineBoxes/Runs
static_cast<RenderText *>(o)->deleteRuns();
#ifdef INCREMENTAL_REPAINTING
o->setNeedsLayout(false);
#endif
}
else if (o->isInlineFlow() && !endOfInline) {
static_cast<RenderFlow*>(o)->deleteLineBoxes();
#ifdef INCREMENTAL_REPAINTING
o->setNeedsLayout(false);
#endif
}
o = Bidinext( this, o, bidi, false, &endOfInline);
}
BidiContext *startEmbed;
if( style()->direction() == LTR ) {
startEmbed = new BidiContext( 0, QChar::DirL );
bidi.status.eor = QChar::DirL;
} else {
startEmbed = new BidiContext( 1, QChar::DirR );
bidi.status.eor = QChar::DirR;
}
startEmbed->ref();
bidi.status.lastStrong = QChar::DirON;
bidi.status.last = QChar::DirON;
bidi.context = startEmbed;
adjustEmbeddding = true;
BidiIterator start(this, first(this, bidi), 0);
adjustEmbeddding = false;
BidiIterator end = start;
m_firstLine = true;
if (!smidpoints)
smidpoints = new QMemArray<BidiIterator>;
sNumMidpoints = 0;
sCurrMidpoint = 0;
sCompactFirstBidiRun = sCompactLastBidiRun = 0;
sCompactBidiRunCount = 0;
previousLineBrokeAtBR = true;
while( !end.atEnd() ) {
start = end;
betweenMidpoints = false;
isLineEmpty = true;
if (m_firstLine && firstChild() && firstChild()->isCompact()) {
buildCompactRuns(firstChild(), bidi);
start.obj = firstChild()->nextSibling();
end = start;
}
end = findNextLineBreak(start, bidi);
if( start.atEnd() ) break;
if (!isLineEmpty) {
bidiReorderLine(start, end, bidi);
// Now that the runs have been ordered, we create the line boxes.
// At the same time we figure out where border/padding/margin should be applied for
// inline flow boxes.
if (sCompactFirstBidiRun) {
// We have a compact line sharing this line. Link the compact runs
// to our runs to create a single line of runs.
sCompactLastBidiRun->nextRun = sFirstBidiRun;
sFirstBidiRun = sCompactFirstBidiRun;
sBidiRunCount += sCompactBidiRunCount;
}
if (sBidiRunCount) {
InlineFlowBox* lineBox = constructLine(start, end);
if (lineBox) {
// Now we position all of our text runs horizontally.
computeHorizontalPositionsForLine(lineBox, bidi);
// Now position our text runs vertically.
computeVerticalPositionsForLine(lineBox);
deleteBidiRuns(renderArena());
}
}
if( end == start || (end.obj && end.obj->isBR() && !start.obj->isBR() ) ) {
adjustEmbeddding = true;
end.increment(bidi);
adjustEmbeddding = false;
} else if(m_pre && end.current() == QChar('\n') ) {
adjustEmbeddding = true;
end.increment(bidi);
adjustEmbeddding = false;
}
m_firstLine = false;
newLine();
}
sNumMidpoints = 0;
sCurrMidpoint = 0;
sCompactFirstBidiRun = sCompactLastBidiRun = 0;
sCompactBidiRunCount = 0;
}
startEmbed->deref();
//embed->deref();
}
sNumMidpoints = 0;
sCurrMidpoint = 0;
// in case we have a float on the last line, it might not be positioned up to now.
// This has to be done before adding in the bottom border/padding, or the float will
// include the padding incorrectly. -dwh
positionNewFloats();
// Now add in the bottom border/padding.
m_height += toAdd;
// Always make sure this is at least our height.
if (m_overflowHeight < m_height)
m_overflowHeight = m_height;
#if BIDI_DEBUG > 1
kdDebug(6041) << " ------- bidi end " << this << " -------" << endl;
#endif
//kdDebug() << "RenderBlock::layoutInlineChildren time used " << qt.elapsed() << endl;
//kdDebug(6040) << "height = " << m_height <<endl;
}
BidiIterator RenderBlock::findNextLineBreak(BidiIterator &start, BidiState &bidi)
{
int width = lineWidth(m_height);
int w = 0;
int tmpW = 0;
#ifdef DEBUG_LINEBREAKS
kdDebug(6041) << "findNextLineBreak: line at " << m_height << " line width " << width << endl;
kdDebug(6041) << "sol: " << start.obj << " " << start.pos << endl;
#endif
// eliminate spaces at beginning of line
// remove leading spaces. Any inline flows we encounter will be empty and should also
// be skipped.
while (!start.atEnd() && (start.obj->isInlineFlow() || (start.obj->style()->whiteSpace() != PRE &&
(start.current() == ' ' || start.obj->isFloatingOrPositioned())))) {
if( start.obj->isFloatingOrPositioned() ) {
RenderObject *o = start.obj;
// add to special objects...
if (o->isFloating()) {
insertFloatingObject(o);
positionNewFloats();
width = lineWidth(m_height);
}
else if (o->isPositioned()) {
if (o->hasStaticX())
o->setStaticX(style()->direction() == LTR ?
borderLeft()+paddingLeft() :
borderRight()+paddingRight());
if (o->hasStaticY())
o->setStaticY(m_height);
}
}
adjustEmbeddding = true;
start.increment(bidi);
adjustEmbeddding = false;
}
if ( start.atEnd() ){
return start;
}
// This variable is used only if whitespace isn't set to PRE, and it tells us whether
// or not we are currently ignoring whitespace.
bool ignoringSpaces = false;
// This variable tracks whether the very last character we saw was a space. We use
// this to detect when we encounter a second space so we know we have to terminate
// a run.
bool currentCharacterIsSpace = false;
RenderObject* trailingSpaceObject = 0;
// The pos of the last whitespace char we saw, not to be confused with the lastSpace
// variable below, which is really the last breakable char.
int lastSpacePos = 0;
BidiIterator lBreak = start;
RenderObject *o = start.obj;
RenderObject *last = o;
int pos = start.pos;
bool prevLineBrokeCleanly = previousLineBrokeAtBR;
previousLineBrokeAtBR = false;
while( o ) {
#ifdef DEBUG_LINEBREAKS
kdDebug(6041) << "new object "<< o <<" width = " << w <<" tmpw = " << tmpW << endl;
#endif
if(o->isBR()) {
if( w + tmpW <= width ) {
lBreak.obj = o;
lBreak.pos = 0;
// A <br> always breaks a line, so don't let the line be collapsed
// away. Also, the space at the end of a line with a <br> does not
// get collapsed away. It only does this if the previous line broke
// cleanly. Otherwise the <br> has no effect on whether the line is
// empty or not.
if (prevLineBrokeCleanly)
isLineEmpty = false;
trailingSpaceObject = 0;
previousLineBrokeAtBR = true;
if (!isLineEmpty) {
// only check the clear status for non-empty lines.
EClear clear = o->style()->clear();
if(clear != CNONE)
m_clearStatus = (EClear) (m_clearStatus | clear);
}
}
goto end;
}
if( o->isFloatingOrPositioned() ) {
// add to special objects...
if(o->isFloating()) {
insertFloatingObject(o);
// check if it fits in the current line.
// If it does, position it now, otherwise, position
// it after moving to next line (in newLine() func)
if (o->width()+o->marginLeft()+o->marginRight()+w+tmpW <= width) {
positionNewFloats();
width = lineWidth(m_height);
}
}
else if (o->isPositioned()) {
// If our original display wasn't an inline type, then we can
// go ahead and determine our static x position now.
bool isInlineType = o->style()->isOriginalDisplayInlineType();
bool needToSetStaticX = o->hasStaticX();
if (o->hasStaticX() && !isInlineType) {
o->setStaticX(o->parent()->style()->direction() == LTR ?
borderLeft()+paddingLeft() :
borderRight()+paddingRight());
needToSetStaticX = false;
}
// If our original display was an INLINE type, then we can go ahead
// and determine our static y position now.
bool needToSetStaticY = o->hasStaticY();
if (o->hasStaticY() && isInlineType) {
o->setStaticY(m_height);
needToSetStaticY = false;
}
// If we're ignoring spaces, we have to stop and include this object and
// then start ignoring spaces again.
if (needToSetStaticX || needToSetStaticY) {
trailingSpaceObject = 0;
if (ignoringSpaces) {
BidiIterator startMid( 0, o, 0 );
BidiIterator stopMid ( 0, o, 1 );
addMidpoint(startMid); // Stop ignoring spaces.
addMidpoint(stopMid); // Start ignoring again.
}
}
}
} else if (o->isInlineFlow()) {
// Only empty inlines matter. We treat those similarly to replaced elements.
KHTMLAssert(!o->firstChild());
tmpW += o->marginLeft()+o->borderLeft()+o->paddingLeft()+
o->marginRight()+o->borderRight()+o->paddingRight();
} else if ( o->isReplaced() ) {
if (o->style()->whiteSpace() == NORMAL || last->style()->whiteSpace() == NORMAL) {
w += tmpW;
tmpW = 0;
lBreak.obj = o;
lBreak.pos = 0;
}
tmpW += o->width()+o->marginLeft()+o->marginRight()+inlineWidth(o);
if (ignoringSpaces) {
BidiIterator startMid( 0, o, 0 );
addMidpoint(startMid);
}
isLineEmpty = false;
ignoringSpaces = false;
currentCharacterIsSpace = false;
lastSpacePos = 0;
trailingSpaceObject = 0;
if (o->isListMarker() && o->style()->listStylePosition() == OUTSIDE) {
// The marker must not have an effect on whitespace at the start
// of the line. We start ignoring spaces to make sure that any additional
// spaces we see will be discarded.
//
// Optimize for a common case. If we can't find whitespace after the list
// item, then this is all moot. -dwh
RenderObject* next = Bidinext( start.par, o, bidi );
if (!m_pre && next && next->isText() && static_cast<RenderText*>(next)->stringLength() > 0 &&
(static_cast<RenderText*>(next)->text()[0].unicode() == ' ' ||
static_cast<RenderText*>(next)->text()[0] == '\n')) {
currentCharacterIsSpace = true;
ignoringSpaces = true;
BidiIterator endMid( 0, o, 0 );
addMidpoint(endMid);
}
}
} else if ( o->isText() ) {
RenderText *t = static_cast<RenderText *>(o);
int strlen = t->stringLength();
int len = strlen - pos;
QChar *str = t->text();
const Font *f = t->htmlFont( m_firstLine );
// proportional font, needs a bit more work.
int lastSpace = pos;
bool isPre = o->style()->whiteSpace() == PRE;
int wordSpacing = o->style()->wordSpacing();
bool appliedStartWidth = pos > 0; // If the span originated on a previous line,
// then assume the start width has been applied.
bool appliedEndWidth = false;
while(len) {
//XXXdwh This is wrong. Still mutating the DOM
// string for newlines... will fix in second stage.
if (!isPre && str[pos] == '\n'){
str[pos] = ' ';
}
bool previousCharacterIsSpace = currentCharacterIsSpace;
currentCharacterIsSpace = (str[pos].unicode() == ' ');
if (isPre || !currentCharacterIsSpace)
isLineEmpty = false;
bool applyWordSpacing = false;
if( (isPre && str[pos] == '\n') || (!isPre && isBreakable( str, pos, strlen )) ) {
if (ignoringSpaces) {
if (!currentCharacterIsSpace) {
// Stop ignoring spaces and begin at this
// new point.
ignoringSpaces = false;
lastSpacePos = 0;
lastSpace = pos; // e.g., "Foo goo", don't add in any of the ignored spaces.
BidiIterator startMid ( 0, o, pos );
addMidpoint(startMid);
}
else {
// Just keep ignoring these spaces.
pos++;
len--;
continue;
}
}
if (currentCharacterIsSpace && !previousCharacterIsSpace)
lastSpacePos = pos;
tmpW += t->width(lastSpace, pos - lastSpace, f);
if (!appliedStartWidth) {
tmpW += inlineWidth(o, true, false);
appliedStartWidth = true;
}
applyWordSpacing = (wordSpacing && currentCharacterIsSpace && !previousCharacterIsSpace &&
!t->containsOnlyWhitespace(pos+1, strlen-(pos+1)));
#ifdef DEBUG_LINEBREAKS
kdDebug(6041) << "found space at " << pos << " in string '" << QString( str, strlen ).latin1() << "' adding " << tmpW << " new width = " << w << endl;
#endif
if ( !isPre && w + tmpW > width && w == 0 ) {
int fb = nearestFloatBottom(m_height);
int newLineWidth = lineWidth(fb);
// See if |tmpW| will fit on the new line. As long as it does not,
// keep adjusting our float bottom until we find some room.
int lastFloatBottom = m_height;
while (lastFloatBottom < fb && tmpW > newLineWidth) {
lastFloatBottom = fb;
fb = nearestFloatBottom(fb);
newLineWidth = lineWidth(fb);
}
if(!w && m_height < fb && width < newLineWidth) {
m_height = fb;
width = newLineWidth;
#ifdef DEBUG_LINEBREAKS
kdDebug() << "RenderBlock::findNextLineBreak new position at " << m_height << " newWidth " << width << endl;
#endif
}
}
if (w + tmpW > width && o->style()->whiteSpace() == NORMAL){
goto end;
}
if( *(str+pos) == '\n' && isPre) {
lBreak.obj = o;
lBreak.pos = pos;
#ifdef DEBUG_LINEBREAKS
kdDebug(6041) << "forced break sol: " << start.obj << " " << start.pos << " end: " << lBreak.obj << " " << lBreak.pos << " width=" << w << endl;
#endif
return lBreak;
}
if (o->style()->whiteSpace() == NORMAL) {
w += tmpW;
tmpW = 0;
lBreak.obj = o;
lBreak.pos = pos;
}
lastSpace = pos;
if (applyWordSpacing)
w += wordSpacing;
if (!ignoringSpaces && !isPre) {
// If we encounter a newline, or if we encounter a
// second space, we need to go ahead and break up this
// run and enter a mode where we start collapsing spaces.
if (currentCharacterIsSpace && previousCharacterIsSpace){
ignoringSpaces = true;
}
if (ignoringSpaces) {
// We just entered a mode where we are ignoring
// spaces. Create a midpoint to terminate the run
// before the second space.
BidiIterator endMid ( 0, trailingSpaceObject ? trailingSpaceObject : o, lastSpacePos );
addMidpoint(endMid);
lastSpace = pos;
}
}
}
else if (ignoringSpaces) {
// Stop ignoring spaces and begin at this
// new point.
ignoringSpaces = false;
lastSpacePos = 0;
lastSpace = pos; // e.g., "Foo goo", don't add in any of the ignored spaces.
BidiIterator startMid ( 0, o, pos );
addMidpoint(startMid);
}
if (!isPre && currentCharacterIsSpace && !ignoringSpaces)
trailingSpaceObject = o;
else if (isPre || !currentCharacterIsSpace)
trailingSpaceObject = 0;
pos++;
len--;
}
// IMPORTANT: pos is > length here!
if (!ignoringSpaces)
tmpW += t->width(lastSpace, pos - lastSpace, f);
if (!appliedStartWidth)
tmpW += inlineWidth(o, true, false);
if (!appliedEndWidth)
tmpW += inlineWidth(o, false, true);
} else
KHTMLAssert( false );
RenderObject* next = Bidinext(start.par, o, bidi);
bool isNormal = o->style()->whiteSpace() == NORMAL;
bool checkForBreak = isNormal;
if (w && w + tmpW > width+1 && lBreak.obj && o->style()->whiteSpace() == NOWRAP)
checkForBreak = true;
else if (next && o->isText() && next->isText() && !next->isBR()) {
if (isNormal || (next->style()->whiteSpace() == NORMAL)) {
if (currentCharacterIsSpace)
checkForBreak = true;
else {
RenderText* nextText = static_cast<RenderText*>(next);
int strlen = nextText->stringLength();
QChar *str = nextText->text();
if (strlen &&
((str[0].unicode() == ' ') ||
(next->style()->whiteSpace() != PRE && str[0] == '\n')))
// If the next item on the line is text, and if we did not end with
// a space, then the next text run continues our word (and so it needs to
// keep adding to |tmpW|. Just update and continue.
checkForBreak = true;
else
checkForBreak = false;
bool canPlaceOnLine = (w + tmpW <= width+1) || !isNormal;
if (canPlaceOnLine && checkForBreak) {
w += tmpW;
tmpW = 0;
lBreak.obj = next;
lBreak.pos = 0;
}
}
}
}
if (checkForBreak && (w + tmpW > width+1)) {
//kdDebug() << " too wide w=" << w << " tmpW = " << tmpW << " width = " << width << endl;
//kdDebug() << "start=" << start.obj << " current=" << o << endl;
// if we have floats, try to get below them.
if (currentCharacterIsSpace && !ignoringSpaces && o->style()->whiteSpace() != PRE)
trailingSpaceObject = 0;
int fb = nearestFloatBottom(m_height);
int newLineWidth = lineWidth(fb);
// See if |tmpW| will fit on the new line. As long as it does not,
// keep adjusting our float bottom until we find some room.
int lastFloatBottom = m_height;
while (lastFloatBottom < fb && tmpW > newLineWidth) {
lastFloatBottom = fb;
fb = nearestFloatBottom(fb);
newLineWidth = lineWidth(fb);
}
if( !w && m_height < fb && width < newLineWidth ) {
m_height = fb;
width = newLineWidth;
#ifdef DEBUG_LINEBREAKS
kdDebug() << "RenderBlock::findNextLineBreak new position at " << m_height << " newWidth " << width << endl;
#endif
}
// |width| may have been adjusted because we got shoved down past a float (thus
// giving us more room), so we need to retest, and only jump to
// the end label if we still don't fit on the line. -dwh
if (w + tmpW > width+1)
goto end;
}
last = o;
o = next;
if (!last->isFloatingOrPositioned() && last->isReplaced() && last->style()->whiteSpace() == NORMAL) {
// Go ahead and add in tmpW.
w += tmpW;
tmpW = 0;
lBreak.obj = o;
lBreak.pos = 0;
}
// Clear out our character space bool, since inline <pre>s don't collapse whitespace
// with adjacent inline normal/nowrap spans.
if (last->style()->whiteSpace() == PRE)
currentCharacterIsSpace = false;
pos = 0;
}
#ifdef DEBUG_LINEBREAKS
kdDebug( 6041 ) << "end of par, width = " << width << " linewidth = " << w + tmpW << endl;
#endif
if( w + tmpW <= width || (last && last->style()->whiteSpace() == NOWRAP)) {
lBreak.obj = 0;
lBreak.pos = 0;
}
end:
if( lBreak == start && !lBreak.obj->isBR() ) {
// we just add as much as possible
if ( m_pre ) {
if(pos != 0) {
lBreak.obj = o;
lBreak.pos = pos - 1;
} else {
lBreak.obj = last;
lBreak.pos = last->isText() ? last->length() : 0;
}
} else if( lBreak.obj ) {
if( last != o ) {
// better to break between object boundaries than in the middle of a word
lBreak.obj = o;
lBreak.pos = 0;
} else {
// Don't ever break in the middle of a word if we can help it.
// There's no room at all. We just have to be on this line,
// even though we'll spill out.
lBreak.obj = o;
lBreak.pos = pos;
}
}
}
// make sure we consume at least one char/object.
if( lBreak == start )
lBreak.increment(bidi);
#ifdef DEBUG_LINEBREAKS
kdDebug(6041) << "regular break sol: " << start.obj << " " << start.pos << " end: " << lBreak.obj << " " << lBreak.pos << " width=" << w << endl;
#endif
// Sanity check our midpoints.
checkMidpoints(lBreak, bidi);
if (trailingSpaceObject) {
// This object is either going to be part of the last midpoint, or it is going
// to be the actual endpoint. In both cases we just decrease our pos by 1 level to
// exclude the space, allowing it to - in effect - collapse into the newline.
if (sNumMidpoints%2==1) {
BidiIterator* midpoints = smidpoints->data();
midpoints[sNumMidpoints-1].pos--;
}
//else if (lBreak.pos > 0)
// lBreak.pos--;
else if (lBreak.obj == 0 && trailingSpaceObject->isText()) {
// Add a new end midpoint that stops right at the very end.
RenderText* text = static_cast<RenderText *>(trailingSpaceObject);
unsigned pos = text->length() >=2 ? text->length() - 2 : UINT_MAX;
BidiIterator endMid ( 0, trailingSpaceObject, pos );
addMidpoint(endMid);
}
}
// We might have made lBreak an iterator that points past the end
// of the object. Do this adjustment to make it point to the start
// of the next object instead to avoid confusing the rest of the
// code.
if (lBreak.pos > 0) {
lBreak.pos--;
lBreak.increment(bidi);
}
return lBreak;
}
// For --enable-final
#undef BIDI_DEBUG
#undef DEBUG_LINEBREAKS
#undef DEBUG_LAYOUT
}