gecko-dev/layout/base/nsCounterManager.h

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
// vim:cindent:ai:sw=4:ts=4:et:
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is nsCounterManager.
*
* The Initial Developer of the Original Code is the Mozilla Foundation.
* Portions created by the Initial Developer are Copyright (C) 2004
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* L. David Baron <dbaron@dbaron.org> (original author)
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/* implementation of CSS counters (for numbering things) */
#ifndef nsCounterManager_h_
#define nsCounterManager_h_
#include "nsGenConList.h"
#include "nsAutoPtr.h"
#include "nsClassHashtable.h"
class nsCounterList;
struct nsCounterUseNode;
struct nsCounterChangeNode;
struct nsCounterNode : public nsGenConNode {
enum Type {
RESET, // a "counter number" pair in 'counter-reset'
INCREMENT, // a "counter number" pair in 'counter-increment'
USE // counter() or counters() in 'content'
};
Type mType;
// Counter value after this node
PRInt32 mValueAfter;
// mScopeStart points to the node (usually a RESET, but not in the
// case of an implied 'counter-reset') that created the scope for
// this element (for a RESET, its outer scope, i.e., the one it is
// inside rather than the one it creates).
// May be null for all types, but only when mScopePrev is also null.
// Being null for a non-RESET means that it is an implied
// 'counter-reset'. Being null for a RESET means it has no outer
// scope.
nsCounterNode *mScopeStart;
// mScopePrev points to the previous node that is in the same scope,
// or for a RESET, the previous node in the scope outside of the
// reset.
// May be null for all types, but only when mScopeStart is also
// null. Following the mScopePrev links will eventually lead to
// mScopeStart. Being null for a non-RESET means that it is an
// implied 'counter-reset'. Being null for a RESET means it has no
// outer scope.
nsCounterNode *mScopePrev;
inline nsCounterUseNode* UseNode();
inline nsCounterChangeNode* ChangeNode();
// For RESET and INCREMENT nodes, aPseudoFrame need not be a
// pseudo-element, and aContentIndex represents the index within the
// 'counter-reset' or 'counter-increment' property instead of within
// the 'content' property but offset to ensure that (reset,
// increment, use) sort in that order. (This slight weirdness
// allows sharing a lot of code with 'quotes'.)
nsCounterNode(nsIFrame* aPseudoFrame, PRInt32 aContentIndex, Type aType)
: nsGenConNode(aPseudoFrame, aContentIndex)
, mType(aType)
, mValueAfter(0)
, mScopeStart(nsnull)
, mScopePrev(nsnull)
{
}
// to avoid virtual function calls in the common case
inline void Calc(nsCounterList* aList);
};
struct nsCounterUseNode : public nsCounterNode {
// The same structure passed through the style system: an array
// containing the values in the counter() or counters() in the order
// given in the CSS spec.
nsRefPtr<nsCSSValue::Array> mCounterStyle;
// false for counter(), true for counters()
PRBool mAllCounters;
// args go directly to member variables here and of nsGenConNode
nsCounterUseNode(nsCSSValue::Array* aCounterStyle, nsIFrame* aPseudoFrame,
PRUint32 aContentIndex, PRBool aAllCounters)
: nsCounterNode(aPseudoFrame, aContentIndex, USE)
, mCounterStyle(aCounterStyle)
, mAllCounters(aAllCounters)
{
NS_ASSERTION(aContentIndex >= 0, "out of range");
}
// assign the correct |mValueAfter| value to a node that has been inserted
// Should be called immediately after calling |Insert|.
void Calc(nsCounterList* aList);
// The text that should be displayed for this counter.
void GetText(nsString& aResult);
};
struct nsCounterChangeNode : public nsCounterNode {
PRInt32 mChangeValue; // the numeric value of the increment or reset
// |aPseudoFrame| is not necessarily a pseudo-element's frame, but
// since it is for every other subclass of nsGenConNode, we follow
// the naming convention here.
// |aPropIndex| is the index of the value within the list in the
// 'counter-increment' or 'counter-reset' property.
nsCounterChangeNode(nsIFrame* aPseudoFrame,
nsCounterNode::Type aChangeType,
PRInt32 aChangeValue,
PRInt32 aPropIndex)
: nsCounterNode(aPseudoFrame,
// Fake a content index for resets and increments
// that comes before all the real content, with
// the resets first, in order, and then the increments.
aPropIndex + (aChangeType == RESET
? (PR_INT32_MIN)
: (PR_INT32_MIN / 2)),
aChangeType)
, mChangeValue(aChangeValue)
{
NS_ASSERTION(aPropIndex >= 0, "out of range");
NS_ASSERTION(aChangeType == INCREMENT || aChangeType == RESET,
"bad type");
}
// assign the correct |mValueAfter| value to a node that has been inserted
// Should be called immediately after calling |Insert|.
void Calc(nsCounterList* aList);
};
inline nsCounterUseNode* nsCounterNode::UseNode()
{
NS_ASSERTION(mType == USE, "wrong type");
return static_cast<nsCounterUseNode*>(this);
}
inline nsCounterChangeNode* nsCounterNode::ChangeNode()
{
NS_ASSERTION(mType == INCREMENT || mType == RESET, "wrong type");
return static_cast<nsCounterChangeNode*>(this);
}
inline void nsCounterNode::Calc(nsCounterList* aList)
{
if (mType == USE)
UseNode()->Calc(aList);
else
ChangeNode()->Calc(aList);
}
class nsCounterList : public nsGenConList {
public:
nsCounterList() : nsGenConList(),
mDirty(PR_FALSE)
{}
void Insert(nsCounterNode* aNode) {
nsGenConList::Insert(aNode);
// Don't SetScope if we're dirty -- we'll reset all the scopes anyway,
// and we can't usefully compute scopes right now.
if (NS_LIKELY(!IsDirty())) {
SetScope(aNode);
}
}
nsCounterNode* First() {
return static_cast<nsCounterNode*>(mFirstNode);
}
static nsCounterNode* Next(nsCounterNode* aNode) {
return static_cast<nsCounterNode*>(nsGenConList::Next(aNode));
}
static nsCounterNode* Prev(nsCounterNode* aNode) {
return static_cast<nsCounterNode*>(nsGenConList::Prev(aNode));
}
static PRInt32 ValueBefore(nsCounterNode* aNode) {
return aNode->mScopePrev ? aNode->mScopePrev->mValueAfter : 0;
}
// Correctly set |aNode->mScopeStart| and |aNode->mScopePrev|
void SetScope(nsCounterNode *aNode);
// Recalculate |mScopeStart|, |mScopePrev|, and |mValueAfter| for
// all nodes and update text in text content nodes.
void RecalcAll();
PRBool IsDirty() { return mDirty; }
void SetDirty() { mDirty = PR_TRUE; }
private:
PRBool mDirty;
};
/**
* The counter manager maintains an |nsCounterList| for each named
* counter to keep track of all scopes with that name.
*/
class nsCounterManager {
public:
nsCounterManager();
// Returns true if dirty
PRBool AddCounterResetsAndIncrements(nsIFrame *aFrame);
// Gets the appropriate counter list, creating it if necessary.
// Returns null only on out-of-memory.
nsCounterList* CounterListFor(const nsSubstring& aCounterName);
// Clean up data in any dirty counter lists.
void RecalcAll();
// Destroy nodes for the frame in any lists, and return whether any
// nodes were destroyed.
PRBool DestroyNodesFor(nsIFrame *aFrame);
// Clear all data.
void Clear() { mNames.Clear(); }
#ifdef DEBUG
void Dump();
#endif
private:
// for |AddCounterResetsAndIncrements| only
PRBool AddResetOrIncrement(nsIFrame *aFrame, PRInt32 aIndex,
const nsStyleCounterData *aCounterData,
nsCounterNode::Type aType);
nsClassHashtable<nsStringHashKey, nsCounterList> mNames;
};
#endif /* nsCounterManager_h_ */