/* get previous item from list */
MemPtr ListPrev
(
LinkedList list, /* list handler */
MemPtr item /* list item */
)
{
ListNode* node;
node = FindPrevNode( list, item );
if ( node != NULL )
return node->data;
else
return NULL;
}
/**
ElemType DeleteCurrNode(CirLinkList *list, CirLinkListNode *currNode);
参数
list : 指向一个链表指针，此处传入表头地址
positon : 待删除结点的位置
返回值
返回待删除结点的数据域
功能
删除链表list中prevNode结点之后的指针个指针
*/
ElemType DeleteCurrNode(CirLinkList *list, CirLinkListNode *currNode)
{
assert(list != NULL); // 链表不能为空
assert(currNode != NULL); // 待删除结点的前一个位置不能为空
assert(IsNodeInList(list, currNode) != -1); // 待删除的结点必须在链表中
ElemType delElem = -1; // 待删除结点的数据域
CirLinkListNode *delNode = NULL; // 指向将要删除的结点的指针
// if(list->m_length == 0)
// {
//
// return -1;
// }
// printf("length = %d\n", list->m_length);
if(currNode->m_next != list->m_head) // 如果待删除结点不是最后一个结点
{
// 将currNode的后一个结点delNode作为删除结点,
delNode = currNode->m_next;
currNode->m_next = delNode->m_next; //从链表中删除delNode
// 并将delNode的数据域保存到delNode中
delElem = currNode->m_data; // delElem保存currNode的数据域
currNode->m_data = delNode->m_data; // 真正删除的结点其实是currNode下一个结点, 因此用currNode保存下一个结点的数据域
}
else // 否则待删除结点是最后一个结点
{
// 直接将最后一个结点删除即可， 应该把其前一个结点的指针域赋值为空
delNode = currNode;
// 下面应该将currnNode的前一个结点的指针域赋值为空[时间复杂度O(n)]
CirLinkListNode *prevNode = FindPrevNode(list, currNode);
prevNode->m_next = list->m_head; /// BUG1 最后一个结点的后一个结点
}
free(delNode);
list->m_length--; // 结点数目减少一个
list->m_head->m_data--; // 头结点的数据域同样存储着结点总数
return delElem;
}
void
mozInlineSpellWordUtil::BuildSoftText()
{
// First we have to work backwards from mSoftStart to find a text node
// containing a DOM word separator, a non-inline-element
// boundary, or the hard start node. That's where we'll start building the
// soft string from.
nsIDOMNode* node = mSoftBegin.mNode;
PRInt32 firstOffsetInNode = 0;
PRInt32 checkBeforeOffset = mSoftBegin.mOffset;
while (node) {
if (ContainsDOMWordSeparator(node, checkBeforeOffset, &firstOffsetInNode))
break;
checkBeforeOffset = PR_INT32_MAX;
if (IsBreakElement(mCSSView, node)) {
// Since FindPrevNode follows tree *preorder*, we're about to traverse
// up out of 'node'. Since node induces breaks (e.g., it's a block),
// don't bother trying to look outside it, just stop now.
break;
}
node = FindPrevNode(node, mRootNode);
}
// Now build up the string moving forward through the DOM until we reach
// the soft end and *then* see a DOM word separator, a non-inline-element
// boundary, or the hard end node.
mSoftText.Truncate();
mSoftTextDOMMapping.Clear();
PRBool seenSoftEnd = PR_FALSE;
// Leave this outside the loop so large heap string allocations can be reused
// across iterations
nsAutoString str;
while (node) {
if (node == mSoftEnd.mNode) {
seenSoftEnd = PR_TRUE;
}
PRBool exit = PR_FALSE;
if (IsTextNode(node)) {
GetNodeText(node, str);
PRInt32 lastOffsetInNode = str.Length();
if (seenSoftEnd) {
// check whether we can stop after this
for (PRInt32 i = node == mSoftEnd.mNode ? mSoftEnd.mOffset : 0;
i < PRInt32(str.Length()); ++i) {
if (IsDOMWordSeparator(str.CharAt(i))) {
exit = PR_TRUE;
// stop at the first separator after the soft end point
lastOffsetInNode = i;
break;
}
}
}
if (firstOffsetInNode < lastOffsetInNode) {
PRInt32 len = lastOffsetInNode - firstOffsetInNode;
mSoftTextDOMMapping.AppendElement(
DOMTextMapping(NodeOffset(node, firstOffsetInNode), mSoftText.Length(), len));
mSoftText.Append(Substring(str, firstOffsetInNode, len));
}
firstOffsetInNode = 0;
}
if (exit)
break;
CheckLeavingBreakElementClosure closure = { mCSSView, PR_FALSE };
node = FindNextNode(node, mRootNode, CheckLeavingBreakElement, &closure);
if (closure.mLeftBreakElement || (node && IsBreakElement(mCSSView, node))) {
// We left, or are entering, a break element (e.g., block). Maybe we can
// stop now.
if (seenSoftEnd)
break;
// Record the break
mSoftText.Append(' ');
}
}
#ifdef DEBUG_SPELLCHECK
printf("Got DOM string: %s\n", NS_ConvertUTF16toUTF8(mSoftText).get());
#endif
}