blob: fd6d80dbc50d2f4433c10d03a22a52c2208f9381 [file] [log] [blame]
/**
* Copyright (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
* Copyright (C) 2006, 2007 Apple Inc. All rights reserved.
*
* 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., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#include "config.h"
#include "RenderCounter.h"
#include "CounterNode.h"
#include "Document.h"
#include "HTMLNames.h"
#include "HTMLOListElement.h"
#include "RenderListItem.h"
#include "RenderListMarker.h"
#include "RenderStyle.h"
#include <wtf/StdLibExtras.h>
namespace WebCore {
using namespace HTMLNames;
typedef HashMap<RefPtr<AtomicStringImpl>, CounterNode*> CounterMap;
typedef HashMap<const RenderObject*, CounterMap*> CounterMaps;
static CounterNode* counter(RenderObject*, const AtomicString& counterName, bool alwaysCreateCounter);
static CounterMaps& counterMaps()
{
DEFINE_STATIC_LOCAL(CounterMaps, staticCounterMaps, ());
return staticCounterMaps;
}
static inline RenderObject* previousSiblingOrParent(RenderObject* object)
{
if (RenderObject* sibling = object->previousSibling())
return sibling;
return object->parent();
}
static CounterNode* lastDescendant(CounterNode* node)
{
CounterNode* last = node->lastChild();
if (!last)
return 0;
while (CounterNode* lastChild = last->lastChild())
last = lastChild;
return last;
}
static CounterNode* previousInPreOrder(CounterNode* node)
{
CounterNode* previous = node->previousSibling();
if (!previous)
return node->parent();
while (CounterNode* lastChild = previous->lastChild())
previous = lastChild;
return previous;
}
static bool planCounter(RenderObject* object, const AtomicString& counterName, bool& isReset, int& value)
{
ASSERT(object);
// Real text nodes don't have their own style so they can't have counters.
// We can't even look at their styles or we'll see extra resets and increments!
if (object->isText() && !object->isBR())
return false;
RenderStyle* style = object->style();
ASSERT(style);
if (const CounterDirectiveMap* directivesMap = style->counterDirectives()) {
CounterDirectives directives = directivesMap->get(counterName.impl());
if (directives.m_reset) {
value = directives.m_resetValue;
if (directives.m_increment)
value += directives.m_incrementValue;
isReset = true;
return true;
}
if (directives.m_increment) {
value = directives.m_incrementValue;
isReset = false;
return true;
}
}
if (counterName == "list-item") {
if (object->isListItem()) {
if (static_cast<RenderListItem*>(object)->hasExplicitValue()) {
value = static_cast<RenderListItem*>(object)->explicitValue();
isReset = true;
return true;
}
value = 1;
isReset = false;
return true;
}
if (Node* e = object->node()) {
if (e->hasTagName(olTag)) {
value = static_cast<HTMLOListElement*>(e)->start();
isReset = true;
return true;
}
if (e->hasTagName(ulTag) || e->hasTagName(menuTag) || e->hasTagName(dirTag)) {
value = 0;
isReset = true;
return true;
}
}
}
return false;
}
static bool findPlaceForCounter(RenderObject* object, const AtomicString& counterName,
bool isReset, CounterNode*& parent, CounterNode*& previousSibling)
{
// Find the appropriate previous sibling for insertion into the parent node
// by searching in render tree order for a child of the counter.
parent = 0;
previousSibling = 0;
RenderObject* resetCandidate = isReset ? object->parent() : previousSiblingOrParent(object);
RenderObject* prevCounterCandidate = object;
CounterNode* candidateCounter = 0;
while ((prevCounterCandidate = prevCounterCandidate->previousInPreOrder())) {
CounterNode* c = counter(prevCounterCandidate, counterName, false);
if (prevCounterCandidate == resetCandidate) {
if (!candidateCounter)
candidateCounter = c;
if (candidateCounter) {
if (candidateCounter->isReset()) {
parent = candidateCounter;
previousSibling = 0;
} else {
parent = candidateCounter->parent();
previousSibling = candidateCounter;
}
return true;
}
resetCandidate = previousSiblingOrParent(resetCandidate);
} else if (c) {
if (c->isReset())
candidateCounter = 0;
else if (!candidateCounter)
candidateCounter = c;
}
}
return false;
}
static CounterNode* counter(RenderObject* object, const AtomicString& counterName, bool alwaysCreateCounter)
{
ASSERT(object);
if (object->m_hasCounterNodeMap)
if (CounterMap* nodeMap = counterMaps().get(object))
if (CounterNode* node = nodeMap->get(counterName.impl()))
return node;
bool isReset = false;
int value = 0;
if (!planCounter(object, counterName, isReset, value) && !alwaysCreateCounter)
return 0;
CounterNode* newParent = 0;
CounterNode* newPreviousSibling = 0;
CounterNode* newNode;
if (findPlaceForCounter(object, counterName, isReset, newParent, newPreviousSibling)) {
newNode = new CounterNode(object, isReset, value);
newParent->insertAfter(newNode, newPreviousSibling);
} else {
// Make a reset node for counters that aren't inside an existing reset node.
newNode = new CounterNode(object, true, value);
}
CounterMap* nodeMap;
if (object->m_hasCounterNodeMap)
nodeMap = counterMaps().get(object);
else {
nodeMap = new CounterMap;
counterMaps().set(object, nodeMap);
object->m_hasCounterNodeMap = true;
}
nodeMap->set(counterName.impl(), newNode);
return newNode;
}
RenderCounter::RenderCounter(Document* node, const CounterContent& counter)
: RenderText(node, StringImpl::empty())
, m_counter(counter)
, m_counterNode(0)
{
}
const char* RenderCounter::renderName() const
{
return "RenderCounter";
}
bool RenderCounter::isCounter() const
{
return true;
}
PassRefPtr<StringImpl> RenderCounter::originalText() const
{
if (!parent())
return 0;
if (!m_counterNode)
m_counterNode = counter(parent(), m_counter.identifier(), true);
CounterNode* child = m_counterNode;
int value = child->isReset() ? child->value() : child->countInParent();
String text = listMarkerText(m_counter.listStyle(), value);
if (!m_counter.separator().isNull()) {
if (!child->isReset())
child = child->parent();
while (CounterNode* parent = child->parent()) {
text = listMarkerText(m_counter.listStyle(), child->countInParent())
+ m_counter.separator() + text;
child = parent;
}
}
return text.impl();
}
void RenderCounter::calcPrefWidths(int lead)
{
setTextInternal(originalText());
RenderText::calcPrefWidths(lead);
}
void RenderCounter::invalidate()
{
m_counterNode = 0;
setNeedsLayoutAndPrefWidthsRecalc();
}
static void destroyCounterNodeChildren(AtomicStringImpl* identifier, CounterNode* node)
{
CounterNode* previous;
for (CounterNode* child = lastDescendant(node); child && child != node; child = previous) {
previous = previousInPreOrder(child);
child->parent()->removeChild(child);
ASSERT(counterMaps().get(child->renderer())->get(identifier) == child);
counterMaps().get(child->renderer())->remove(identifier);
if (!child->renderer()->documentBeingDestroyed()) {
RenderObjectChildList* children = child->renderer()->virtualChildren();
if (children)
children->invalidateCounters(child->renderer());
}
delete child;
}
}
void RenderCounter::destroyCounterNodes(RenderObject* object)
{
CounterMaps& maps = counterMaps();
CounterMap* map = maps.get(object);
if (!map)
return;
maps.remove(object);
CounterMap::const_iterator end = map->end();
for (CounterMap::const_iterator it = map->begin(); it != end; ++it) {
CounterNode* node = it->second;
destroyCounterNodeChildren(it->first.get(), node);
if (CounterNode* parent = node->parent())
parent->removeChild(node);
delete node;
}
delete map;
}
} // namespace WebCore