mirror of
https://github.com/classilla/tenfourfox.git
synced 2024-09-11 02:56:06 +00:00
423 lines
11 KiB
C++
423 lines
11 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
#include "mozilla/mozalloc.h"
|
|
#include "nsComponentManagerUtils.h"
|
|
#include "nsContentUtils.h"
|
|
#include "nsDebug.h"
|
|
#include "nsError.h"
|
|
#include "nsFilteredContentIterator.h"
|
|
#include "nsIAtom.h"
|
|
#include "nsIContent.h"
|
|
#include "nsIContentIterator.h"
|
|
#include "nsIDOMNode.h"
|
|
#include "nsINode.h"
|
|
#include "nsISupportsBase.h"
|
|
#include "nsISupportsUtils.h"
|
|
#include "nsITextServicesFilter.h"
|
|
#include "nsRange.h"
|
|
|
|
//------------------------------------------------------------
|
|
nsFilteredContentIterator::nsFilteredContentIterator(nsITextServicesFilter* aFilter) :
|
|
mFilter(aFilter),
|
|
mDidSkip(false),
|
|
mIsOutOfRange(false),
|
|
mDirection(eDirNotSet)
|
|
{
|
|
mIterator = do_CreateInstance("@mozilla.org/content/post-content-iterator;1");
|
|
mPreIterator = do_CreateInstance("@mozilla.org/content/pre-content-iterator;1");
|
|
}
|
|
|
|
//------------------------------------------------------------
|
|
nsFilteredContentIterator::~nsFilteredContentIterator()
|
|
{
|
|
}
|
|
|
|
//------------------------------------------------------------
|
|
NS_IMPL_CYCLE_COLLECTING_ADDREF(nsFilteredContentIterator)
|
|
NS_IMPL_CYCLE_COLLECTING_RELEASE(nsFilteredContentIterator)
|
|
|
|
NS_INTERFACE_MAP_BEGIN(nsFilteredContentIterator)
|
|
NS_INTERFACE_MAP_ENTRY(nsIContentIterator)
|
|
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIContentIterator)
|
|
NS_INTERFACE_MAP_ENTRIES_CYCLE_COLLECTION(nsFilteredContentIterator)
|
|
NS_INTERFACE_MAP_END
|
|
|
|
NS_IMPL_CYCLE_COLLECTION(nsFilteredContentIterator,
|
|
mCurrentIterator,
|
|
mIterator,
|
|
mPreIterator,
|
|
mFilter,
|
|
mRange)
|
|
|
|
//------------------------------------------------------------
|
|
nsresult
|
|
nsFilteredContentIterator::Init(nsINode* aRoot)
|
|
{
|
|
NS_ENSURE_ARG_POINTER(aRoot);
|
|
NS_ENSURE_TRUE(mPreIterator, NS_ERROR_FAILURE);
|
|
NS_ENSURE_TRUE(mIterator, NS_ERROR_FAILURE);
|
|
mIsOutOfRange = false;
|
|
mDirection = eForward;
|
|
mCurrentIterator = mPreIterator;
|
|
|
|
mRange = new nsRange(aRoot);
|
|
nsCOMPtr<nsIDOMNode> domNode(do_QueryInterface(aRoot));
|
|
if (domNode) {
|
|
mRange->SelectNode(domNode);
|
|
}
|
|
|
|
nsresult rv = mPreIterator->Init(mRange);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
return mIterator->Init(mRange);
|
|
}
|
|
|
|
//------------------------------------------------------------
|
|
nsresult
|
|
nsFilteredContentIterator::Init(nsIDOMRange* aRange)
|
|
{
|
|
NS_ENSURE_TRUE(mPreIterator, NS_ERROR_FAILURE);
|
|
NS_ENSURE_TRUE(mIterator, NS_ERROR_FAILURE);
|
|
NS_ENSURE_ARG_POINTER(aRange);
|
|
mIsOutOfRange = false;
|
|
mDirection = eForward;
|
|
mCurrentIterator = mPreIterator;
|
|
|
|
mRange = static_cast<nsRange*>(aRange)->CloneRange();
|
|
|
|
nsresult rv = mPreIterator->Init(mRange);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
return mIterator->Init(mRange);
|
|
}
|
|
|
|
//------------------------------------------------------------
|
|
nsresult
|
|
nsFilteredContentIterator::SwitchDirections(bool aChangeToForward)
|
|
{
|
|
nsINode *node = mCurrentIterator->GetCurrentNode();
|
|
|
|
if (aChangeToForward) {
|
|
mCurrentIterator = mPreIterator;
|
|
mDirection = eForward;
|
|
} else {
|
|
mCurrentIterator = mIterator;
|
|
mDirection = eBackward;
|
|
}
|
|
|
|
if (node) {
|
|
nsresult rv = mCurrentIterator->PositionAt(node);
|
|
if (NS_FAILED(rv)) {
|
|
mIsOutOfRange = true;
|
|
return rv;
|
|
}
|
|
}
|
|
return NS_OK;
|
|
}
|
|
|
|
//------------------------------------------------------------
|
|
void
|
|
nsFilteredContentIterator::First()
|
|
{
|
|
if (!mCurrentIterator) {
|
|
NS_ERROR("Missing iterator!");
|
|
|
|
return;
|
|
}
|
|
|
|
// If we are switching directions then
|
|
// we need to switch how we process the nodes
|
|
if (mDirection != eForward) {
|
|
mCurrentIterator = mPreIterator;
|
|
mDirection = eForward;
|
|
mIsOutOfRange = false;
|
|
}
|
|
|
|
mCurrentIterator->First();
|
|
|
|
if (mCurrentIterator->IsDone()) {
|
|
return;
|
|
}
|
|
|
|
nsINode *currentNode = mCurrentIterator->GetCurrentNode();
|
|
nsCOMPtr<nsIDOMNode> node(do_QueryInterface(currentNode));
|
|
|
|
bool didCross;
|
|
CheckAdvNode(node, didCross, eForward);
|
|
}
|
|
|
|
//------------------------------------------------------------
|
|
void
|
|
nsFilteredContentIterator::Last()
|
|
{
|
|
if (!mCurrentIterator) {
|
|
NS_ERROR("Missing iterator!");
|
|
|
|
return;
|
|
}
|
|
|
|
// If we are switching directions then
|
|
// we need to switch how we process the nodes
|
|
if (mDirection != eBackward) {
|
|
mCurrentIterator = mIterator;
|
|
mDirection = eBackward;
|
|
mIsOutOfRange = false;
|
|
}
|
|
|
|
mCurrentIterator->Last();
|
|
|
|
if (mCurrentIterator->IsDone()) {
|
|
return;
|
|
}
|
|
|
|
nsINode *currentNode = mCurrentIterator->GetCurrentNode();
|
|
nsCOMPtr<nsIDOMNode> node(do_QueryInterface(currentNode));
|
|
|
|
bool didCross;
|
|
CheckAdvNode(node, didCross, eBackward);
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////////////////
|
|
// ContentToParentOffset: returns the content node's parent and offset.
|
|
//
|
|
static void
|
|
ContentToParentOffset(nsIContent *aContent, nsIDOMNode **aParent,
|
|
int32_t *aOffset)
|
|
{
|
|
if (!aParent || !aOffset)
|
|
return;
|
|
|
|
*aParent = nullptr;
|
|
*aOffset = 0;
|
|
|
|
if (!aContent)
|
|
return;
|
|
|
|
nsIContent* parent = aContent->GetParent();
|
|
|
|
if (!parent)
|
|
return;
|
|
|
|
*aOffset = parent->IndexOf(aContent);
|
|
|
|
CallQueryInterface(parent, aParent);
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////////////////
|
|
// ContentIsInTraversalRange: returns true if content is visited during
|
|
// the traversal of the range in the specified mode.
|
|
//
|
|
static bool
|
|
ContentIsInTraversalRange(nsIContent *aContent, bool aIsPreMode,
|
|
nsIDOMNode *aStartNode, int32_t aStartOffset,
|
|
nsIDOMNode *aEndNode, int32_t aEndOffset)
|
|
{
|
|
NS_ENSURE_TRUE(aStartNode && aEndNode && aContent, false);
|
|
|
|
nsCOMPtr<nsIDOMNode> parentNode;
|
|
int32_t indx = 0;
|
|
|
|
ContentToParentOffset(aContent, getter_AddRefs(parentNode), &indx);
|
|
|
|
NS_ENSURE_TRUE(parentNode, false);
|
|
|
|
if (!aIsPreMode)
|
|
++indx;
|
|
|
|
int32_t startRes = nsContentUtils::ComparePoints(aStartNode, aStartOffset,
|
|
parentNode, indx);
|
|
int32_t endRes = nsContentUtils::ComparePoints(aEndNode, aEndOffset,
|
|
parentNode, indx);
|
|
return (startRes <= 0) && (endRes >= 0);
|
|
}
|
|
|
|
static bool
|
|
ContentIsInTraversalRange(nsRange* aRange, nsIDOMNode* aNextNode, bool aIsPreMode)
|
|
{
|
|
nsCOMPtr<nsIContent> content(do_QueryInterface(aNextNode));
|
|
NS_ENSURE_TRUE(content && aRange, false);
|
|
|
|
nsCOMPtr<nsIDOMNode> sNode;
|
|
nsCOMPtr<nsIDOMNode> eNode;
|
|
int32_t sOffset;
|
|
int32_t eOffset;
|
|
aRange->GetStartContainer(getter_AddRefs(sNode));
|
|
aRange->GetStartOffset(&sOffset);
|
|
aRange->GetEndContainer(getter_AddRefs(eNode));
|
|
aRange->GetEndOffset(&eOffset);
|
|
return ContentIsInTraversalRange(content, aIsPreMode, sNode, sOffset, eNode, eOffset);
|
|
}
|
|
|
|
//------------------------------------------------------------
|
|
// Helper function to advance to the next or previous node
|
|
nsresult
|
|
nsFilteredContentIterator::AdvanceNode(nsIDOMNode* aNode, nsIDOMNode*& aNewNode, eDirectionType aDir)
|
|
{
|
|
nsCOMPtr<nsIDOMNode> nextNode;
|
|
if (aDir == eForward) {
|
|
aNode->GetNextSibling(getter_AddRefs(nextNode));
|
|
} else {
|
|
aNode->GetPreviousSibling(getter_AddRefs(nextNode));
|
|
}
|
|
|
|
if (nextNode) {
|
|
// If we got here, that means we found the nxt/prv node
|
|
// make sure it is in our DOMRange
|
|
bool intersects = ContentIsInTraversalRange(mRange, nextNode, aDir == eForward);
|
|
if (intersects) {
|
|
aNewNode = nextNode;
|
|
NS_ADDREF(aNewNode);
|
|
return NS_OK;
|
|
}
|
|
} else {
|
|
// The next node was null so we need to walk up the parent(s)
|
|
nsCOMPtr<nsIDOMNode> parent;
|
|
aNode->GetParentNode(getter_AddRefs(parent));
|
|
NS_ASSERTION(parent, "parent can't be nullptr");
|
|
|
|
// Make sure the parent is in the DOMRange before going further
|
|
bool intersects = ContentIsInTraversalRange(mRange, nextNode, aDir == eForward);
|
|
if (intersects) {
|
|
// Now find the nxt/prv node after/before this node
|
|
nsresult rv = AdvanceNode(parent, aNewNode, aDir);
|
|
if (NS_SUCCEEDED(rv) && aNewNode) {
|
|
return NS_OK;
|
|
}
|
|
}
|
|
}
|
|
|
|
// if we get here it pretty much means
|
|
// we went out of the DOM Range
|
|
mIsOutOfRange = true;
|
|
|
|
return NS_ERROR_FAILURE;
|
|
}
|
|
|
|
//------------------------------------------------------------
|
|
// Helper function to see if the next/prev node should be skipped
|
|
void
|
|
nsFilteredContentIterator::CheckAdvNode(nsIDOMNode* aNode, bool& aDidSkip, eDirectionType aDir)
|
|
{
|
|
aDidSkip = false;
|
|
mIsOutOfRange = false;
|
|
|
|
if (aNode && mFilter) {
|
|
nsCOMPtr<nsIDOMNode> currentNode = aNode;
|
|
bool skipIt;
|
|
while (1) {
|
|
nsresult rv = mFilter->Skip(aNode, &skipIt);
|
|
if (NS_SUCCEEDED(rv) && skipIt) {
|
|
aDidSkip = true;
|
|
// Get the next/prev node and then
|
|
// see if we should skip that
|
|
nsCOMPtr<nsIDOMNode> advNode;
|
|
rv = AdvanceNode(aNode, *getter_AddRefs(advNode), aDir);
|
|
if (NS_SUCCEEDED(rv) && advNode) {
|
|
aNode = advNode;
|
|
} else {
|
|
return; // fell out of range
|
|
}
|
|
} else {
|
|
if (aNode != currentNode) {
|
|
nsCOMPtr<nsIContent> content(do_QueryInterface(aNode));
|
|
mCurrentIterator->PositionAt(content);
|
|
}
|
|
return; // found something
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
nsFilteredContentIterator::Next()
|
|
{
|
|
if (mIsOutOfRange || !mCurrentIterator) {
|
|
NS_ASSERTION(mCurrentIterator, "Missing iterator!");
|
|
|
|
return;
|
|
}
|
|
|
|
// If we are switching directions then
|
|
// we need to switch how we process the nodes
|
|
if (mDirection != eForward) {
|
|
nsresult rv = SwitchDirections(true);
|
|
if (NS_FAILED(rv)) {
|
|
return;
|
|
}
|
|
}
|
|
|
|
mCurrentIterator->Next();
|
|
|
|
if (mCurrentIterator->IsDone()) {
|
|
return;
|
|
}
|
|
|
|
// If we can't get the current node then
|
|
// don't check to see if we can skip it
|
|
nsINode *currentNode = mCurrentIterator->GetCurrentNode();
|
|
|
|
nsCOMPtr<nsIDOMNode> node(do_QueryInterface(currentNode));
|
|
CheckAdvNode(node, mDidSkip, eForward);
|
|
}
|
|
|
|
void
|
|
nsFilteredContentIterator::Prev()
|
|
{
|
|
if (mIsOutOfRange || !mCurrentIterator) {
|
|
NS_ASSERTION(mCurrentIterator, "Missing iterator!");
|
|
|
|
return;
|
|
}
|
|
|
|
// If we are switching directions then
|
|
// we need to switch how we process the nodes
|
|
if (mDirection != eBackward) {
|
|
nsresult rv = SwitchDirections(false);
|
|
if (NS_FAILED(rv)) {
|
|
return;
|
|
}
|
|
}
|
|
|
|
mCurrentIterator->Prev();
|
|
|
|
if (mCurrentIterator->IsDone()) {
|
|
return;
|
|
}
|
|
|
|
// If we can't get the current node then
|
|
// don't check to see if we can skip it
|
|
nsINode *currentNode = mCurrentIterator->GetCurrentNode();
|
|
|
|
nsCOMPtr<nsIDOMNode> node(do_QueryInterface(currentNode));
|
|
CheckAdvNode(node, mDidSkip, eBackward);
|
|
}
|
|
|
|
nsINode *
|
|
nsFilteredContentIterator::GetCurrentNode()
|
|
{
|
|
if (mIsOutOfRange || !mCurrentIterator) {
|
|
return nullptr;
|
|
}
|
|
|
|
return mCurrentIterator->GetCurrentNode();
|
|
}
|
|
|
|
bool
|
|
nsFilteredContentIterator::IsDone()
|
|
{
|
|
if (mIsOutOfRange || !mCurrentIterator) {
|
|
return true;
|
|
}
|
|
|
|
return mCurrentIterator->IsDone();
|
|
}
|
|
|
|
nsresult
|
|
nsFilteredContentIterator::PositionAt(nsINode* aCurNode)
|
|
{
|
|
NS_ENSURE_TRUE(mCurrentIterator, NS_ERROR_FAILURE);
|
|
mIsOutOfRange = false;
|
|
return mCurrentIterator->PositionAt(aCurNode);
|
|
}
|