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gecko-dev/editor/base/nsHTMLEditRules.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape Public License
* Version 1.0 (the "NPL") you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
#include "nsHTMLEditRules.h"
#include "nsEditor.h"
#include "nsHTMLEditor.h"
#include "nsTextEditor.h"
#include "PlaceholderTxn.h"
#include "InsertTextTxn.h"
#include "nsIContent.h"
#include "nsIContentIterator.h"
#include "nsIDOMNode.h"
#include "nsIDOMText.h"
#include "nsIDOMElement.h"
#include "nsIDOMNodeList.h"
#include "nsIDOMSelection.h"
#include "nsIDOMRange.h"
#include "nsIDOMCharacterData.h"
#include "nsIEnumerator.h"
#include "nsIStyleContext.h"
#include "nsIPresShell.h"
#include "nsLayoutCID.h"
class nsIFrame;
//const static char* kMOZEditorBogusNodeAttr="MOZ_EDITOR_BOGUS_NODE";
//const static char* kMOZEditorBogusNodeValue="TRUE";
const unsigned char nbsp = 160;
static NS_DEFINE_IID(kSubtreeIteratorCID, NS_SUBTREEITERATOR_CID);
enum
{
kLonely = 0,
kPrevSib = 1,
kNextSib = 2,
kBothSibs = 3
};
/********************************************************
* Constructor/Destructor
********************************************************/
nsHTMLEditRules::nsHTMLEditRules()
{
}
nsHTMLEditRules::~nsHTMLEditRules()
{
}
/********************************************************
* Public methods
********************************************************/
NS_IMETHODIMP
nsHTMLEditRules::WillDoAction(nsIDOMSelection *aSelection,
nsRulesInfo *aInfo, PRBool *aCancel)
{
if (!aInfo || !aCancel)
return NS_ERROR_NULL_POINTER;
*aCancel = PR_FALSE;
// my kingdom for dynamic cast
nsTextRulesInfo *info = NS_STATIC_CAST(nsTextRulesInfo*, aInfo);
switch (info->action)
{
case kInsertText:
return WillInsertText(aSelection,
aCancel,
info->placeTxn,
info->inString,
info->outString,
info->typeInState,
info->maxLength);
case kInsertBreak:
return WillInsertBreak(aSelection, aCancel);
case kDeleteSelection:
return WillDeleteSelection(aSelection, info->collapsedAction, aCancel);
case kMakeList:
return WillMakeList(aSelection, info->bOrdered, aCancel);
case kIndent:
return WillIndent(aSelection, aCancel);
case kOutdent:
return WillOutdent(aSelection, aCancel);
case kAlign:
return WillAlign(aSelection, info->alignType, aCancel);
case kMakeHeader:
return WillMakeHeader(aSelection, aCancel);
case kMakeAddress:
return WillMakeAddress(aSelection, aCancel);
case kMakePRE:
return WillMakePRE(aSelection, aCancel);
}
return nsTextEditRules::WillDoAction(aSelection, aInfo, aCancel);
}
NS_IMETHODIMP
nsHTMLEditRules::DidDoAction(nsIDOMSelection *aSelection,
nsRulesInfo *aInfo, nsresult aResult)
{
// my kingdom for dynamic cast
nsTextRulesInfo *info = NS_STATIC_CAST(nsTextRulesInfo*, aInfo);
switch (info->action)
{
case kInsertBreak:
return NS_OK;
}
return nsTextEditRules::DidDoAction(aSelection, aInfo, aResult);
}
/********************************************************
* Protected rules methods
********************************************************/
nsresult
nsHTMLEditRules::WillInsertText(nsIDOMSelection *aSelection,
PRBool *aCancel,
PlaceholderTxn **aTxn,
const nsString *inString,
nsString *outString,
TypeInState typeInState,
PRInt32 aMaxLength)
{ if (!aSelection || !aCancel) { return NS_ERROR_NULL_POINTER; }
// initialize out param
*aCancel = PR_FALSE;
nsresult res;
char specialChars[] = {'\t',' ',nbsp,'\n',0};
mEditor->BeginTransaction(); // we have to batch this in case there are returns
// Insert Break txns don't auto merge with insert text txns
// strategy: there are simple cases and harder cases. The harder cases
// we handle recursively by breaking them into a series of simple cases.
// The simple cases are:
// 1) a single space
// 2) a single nbsp
// 3) a single tab
// 4) a single return
// 5) a run of chars containing no spaces, nbsp's, tabs, or returns
char nbspStr[2] = {nbsp, 0};
// is it a solo tab?
if (*inString == "\t" )
{
res = InsertTab(aSelection,aCancel,aTxn,outString);
}
// is it a solo space?
else if (*inString == " ")
{
res = InsertSpace(aSelection,aCancel,aTxn,outString);
}
// is it a solo nbsp?
else if (*inString == nbspStr)
{
res = InsertSpace(aSelection,aCancel,aTxn,outString);
}
// is it a solo return?
else if (*inString == "\n")
{
// special case - cancel default handling
*aCancel = PR_TRUE;
res = mEditor->InsertBreak();
}
else
{
// is it an innocous run of chars? no spaces, nbsps, returns, tabs?
PRInt32 pos = inString->FindCharInSet(specialChars);
if (pos == -1)
{
// no special chars, easy case
res = nsTextEditRules::WillInsertText(aSelection, aCancel, aTxn, inString, outString, typeInState, aMaxLength);
}
else
{
// else we need to break it up into two parts and recurse
*aCancel = PR_TRUE;
nsString firstString;
nsString restOfString(*inString);
// if first char is special, then use just it
if (pos == 0) pos = 1;
inString->Left(firstString, pos);
restOfString.Cut(0, pos);
if (NS_SUCCEEDED(mEditor->InsertText(firstString)))
{
res = mEditor->InsertText(restOfString);
}
}
}
mEditor->EndTransaction();
return res;
}
nsresult
nsHTMLEditRules::WillInsertBreak(nsIDOMSelection *aSelection, PRBool *aCancel)
{
if (!aSelection || !aCancel) { return NS_ERROR_NULL_POINTER; }
// initialize out param
*aCancel = PR_FALSE;
nsresult res;
// if the selection isn't collapsed, delete it.
PRBool bCollapsed;
res = aSelection->GetIsCollapsed(&bCollapsed);
if (NS_FAILED(res)) return res;
if (!bCollapsed)
{
res = mEditor->DeleteSelection(nsIEditor::eDoNothing);
if (NS_FAILED(res)) return res;
}
//smart splitting rules
nsCOMPtr<nsIDOMNode> node;
PRInt32 offset;
PRBool isPRE;
res = mEditor->GetStartNodeAndOffset(aSelection, &node, &offset);
if (NS_FAILED(res)) return res;
if (!node) return NS_ERROR_FAILURE;
res = mEditor->IsPreformatted(node,&isPRE);
if (NS_FAILED(res)) return res;
if (isPRE)
{
nsString theString = "\n";
*aCancel = PR_TRUE;
return mEditor->InsertText(theString);
}
nsCOMPtr<nsIDOMNode> blockParent = mEditor->GetBlockNodeParent(node);
if (!blockParent) return NS_ERROR_FAILURE;
// headers: put selection after the header
if (IsHeader(blockParent))
{
res = ReturnInHeader(aSelection, blockParent, node, offset);
*aCancel = PR_TRUE;
return NS_OK;
}
// paragraphs: special rules to look for <br>s
if (IsParagraph(blockParent))
{
res = ReturnInParagraph(aSelection, blockParent, node, offset, aCancel);
return NS_OK;
}
// list items: special rules to make new list items
if (IsListItem(blockParent))
{
res = ReturnInListItem(aSelection, blockParent, node, offset);
*aCancel = PR_TRUE;
return NS_OK;
}
return WillInsert(aSelection, aCancel);
}
nsresult
nsHTMLEditRules::WillDeleteSelection(nsIDOMSelection *aSelection, nsIEditor::ECollapsedSelectionAction aAction, PRBool *aCancel)
{
if (!aSelection || !aCancel) { return NS_ERROR_NULL_POINTER; }
// initialize out param
*aCancel = PR_FALSE;
nsresult res = NS_OK;
PRBool bCollapsed;
res = aSelection->GetIsCollapsed(&bCollapsed);
if (NS_FAILED(res)) return res;
nsCOMPtr<nsIDOMNode> node;
PRInt32 offset;
res = mEditor->GetStartNodeAndOffset(aSelection, &node, &offset);
if (NS_FAILED(res)) return res;
if (!node) return NS_ERROR_FAILURE;
if (bCollapsed)
{
// easy case, in a text node:
if (mEditor->IsTextNode(node))
{
nsCOMPtr<nsIDOMText> textNode = do_QueryInterface(node);
PRUint32 strLength;
res = textNode->GetLength(&strLength);
if (NS_FAILED(res)) return res;
// at beginning of text node and backspaced?
if (!offset && (aAction == nsIEditor::eDeleteLeft))
{
nsCOMPtr<nsIDOMNode> priorNode;
res = mEditor->GetPriorNode(node, PR_TRUE, getter_AddRefs(priorNode));
if (NS_FAILED(res)) return res;
// if there is no prior node then cancel the deletion
if (!priorNode)
{
*aCancel = PR_TRUE;
return res;
}
// block parents the same? use default deletion
if (mEditor->HasSameBlockNodeParent(node, priorNode)) return NS_OK;
// deleting across blocks
// are the blocks of same type?
nsCOMPtr<nsIDOMNode> leftParent = mEditor->GetBlockNodeParent(priorNode);
nsCOMPtr<nsIDOMNode> rightParent = mEditor->GetBlockNodeParent(node);
nsCOMPtr<nsIAtom> leftAtom = mEditor->GetTag(leftParent);
nsCOMPtr<nsIAtom> rightAtom = mEditor->GetTag(rightParent);
if (leftAtom.get() == rightAtom.get())
{
nsCOMPtr<nsIDOMNode> topParent;
leftParent->GetParentNode(getter_AddRefs(topParent));
if (IsParagraph(leftParent))
{
// join para's, insert break
*aCancel = PR_TRUE;
res = mEditor->JoinNodeDeep(leftParent,rightParent,aSelection);
if (NS_FAILED(res)) return res;
res = mEditor->InsertBreak();
return res;
}
if (IsListItem(leftParent) || IsHeader(leftParent))
{
// join blocks
*aCancel = PR_TRUE;
res = mEditor->JoinNodeDeep(leftParent,rightParent,aSelection);
return res;
}
}
// else blocks not same type, bail to default
return NS_OK;
}
// at end of text node and deleted?
if ((offset == (PRInt32)strLength)
&& (aAction == nsIEditor::eDeleteRight))
{
nsCOMPtr<nsIDOMNode> nextNode;
res = mEditor->GetNextNode(node, PR_TRUE, getter_AddRefs(nextNode));
if (NS_FAILED(res)) return res;
// if there is no next node then cancel the deletion
if (!nextNode)
{
*aCancel = PR_TRUE;
return res;
}
// block parents the same? use default deletion
if (mEditor->HasSameBlockNodeParent(node, nextNode)) return NS_OK;
// deleting across blocks
// are the blocks of same type?
nsCOMPtr<nsIDOMNode> leftParent = mEditor->GetBlockNodeParent(node);
nsCOMPtr<nsIDOMNode> rightParent = mEditor->GetBlockNodeParent(nextNode);
nsCOMPtr<nsIAtom> leftAtom = mEditor->GetTag(leftParent);
nsCOMPtr<nsIAtom> rightAtom = mEditor->GetTag(rightParent);
if (leftAtom.get() == rightAtom.get())
{
nsCOMPtr<nsIDOMNode> topParent;
leftParent->GetParentNode(getter_AddRefs(topParent));
if (IsParagraph(leftParent))
{
// join para's, insert break
*aCancel = PR_TRUE;
res = mEditor->JoinNodeDeep(leftParent,rightParent,aSelection);
if (NS_FAILED(res)) return res;
res = mEditor->InsertBreak();
return res;
}
if (IsListItem(leftParent) || IsHeader(leftParent))
{
// join blocks
*aCancel = PR_TRUE;
res = mEditor->JoinNodeDeep(leftParent,rightParent,aSelection);
return res;
}
}
// else blocks not same type, bail to default
return NS_OK;
}
// else do default
return NS_OK;
}
}
// else we have a non collapsed selection
// figure out if the enpoints are in nodes that can be merged
nsCOMPtr<nsIDOMNode> endNode;
PRInt32 endOffset;
res = mEditor->GetEndNodeAndOffset(aSelection, &endNode, &endOffset);
if (NS_FAILED(res))
{
return res;
}
if (endNode.get() != node.get())
{
// block parents the same? use default deletion
if (mEditor->HasSameBlockNodeParent(node, endNode)) return NS_OK;
// deleting across blocks
// are the blocks of same type?
nsCOMPtr<nsIDOMNode> leftParent = mEditor->GetBlockNodeParent(node);
nsCOMPtr<nsIDOMNode> rightParent = mEditor->GetBlockNodeParent(endNode);
// are the blocks siblings?
nsCOMPtr<nsIDOMNode> leftBlockParent;
nsCOMPtr<nsIDOMNode> rightBlockParent;
leftParent->GetParentNode(getter_AddRefs(leftBlockParent));
rightParent->GetParentNode(getter_AddRefs(rightBlockParent));
// bail to default if blocks aren't siblings
if (leftBlockParent.get() != rightBlockParent.get()) return NS_OK;
nsCOMPtr<nsIAtom> leftAtom = mEditor->GetTag(leftParent);
nsCOMPtr<nsIAtom> rightAtom = mEditor->GetTag(rightParent);
if (leftAtom.get() == rightAtom.get())
{
nsCOMPtr<nsIDOMNode> topParent;
leftParent->GetParentNode(getter_AddRefs(topParent));
if (IsParagraph(leftParent))
{
// first delete the selection
*aCancel = PR_TRUE;
res = mEditor->nsEditor::DeleteSelection(aAction);
if (NS_FAILED(res)) return res;
// then join para's, insert break
res = mEditor->JoinNodeDeep(leftParent,rightParent,aSelection);
if (NS_FAILED(res)) return res;
//res = mEditor->InsertBreak();
// uhh, no, we don't want to have the <br> on a deleted selction across para's
return res;
}
if (IsListItem(leftParent) || IsHeader(leftParent))
{
// first delete the selection
*aCancel = PR_TRUE;
res = mEditor->nsEditor::DeleteSelection(aAction);
if (NS_FAILED(res)) return res;
// join blocks
res = mEditor->JoinNodeDeep(leftParent,rightParent,aSelection);
return res;
}
}
// else blocks not same type, bail to default
return NS_OK;
}
return res;
}
nsresult
nsHTMLEditRules::WillMakeList(nsIDOMSelection *aSelection, PRBool aOrdered, PRBool *aCancel)
{
if (!aSelection || !aCancel) { return NS_ERROR_NULL_POINTER; }
// initialize out param
*aCancel = PR_TRUE;
nsAutoSelectionReset selectionResetter(aSelection);
nsresult res;
// convert the selection ranges into "promoted" selection ranges:
// this basically just expands the range to include the immediate
// block parent, and then further expands to include any ancestors
// whose children are all in the range
nsCOMPtr<nsISupportsArray> arrayOfRanges;
res = GetPromotedRanges(aSelection, &arrayOfRanges, kMakeList);
if (NS_FAILED(res)) return res;
// use these ranges to contruct a list of nodes to act on.
nsCOMPtr<nsISupportsArray> arrayOfNodes;
res = GetNodesForOperation(arrayOfRanges, &arrayOfNodes, kMakeList);
if (NS_FAILED(res)) return res;
// if we ended up with any nodes in the list that aren't blocknodes,
// find their block parent instead and use that.
// i started writing this and then the sky fell. there are big questions
// about what to do here. i may need to switch from thinking about an array of
// nodes to act on to instead think of an array of ranges to act on.
// Next we remove all the <br>'s in the array. This won't prevent <br>'s
// inside of <p>'s from being significant - those <br>'s are not hit by
// the subtree iterator, since they are enclosed in a <p>.
// We also remove all non-editable nodes. Leave them be.
PRUint32 listCount;
PRInt32 i;
arrayOfNodes->Count(&listCount);
for (i=listCount-1; i>=0; i--)
{
nsCOMPtr<nsISupports> isupports = (dont_AddRef)(arrayOfNodes->ElementAt(i));
nsCOMPtr<nsIDOMNode> testNode( do_QueryInterface(isupports ) );
if (IsBreak(testNode))
{
arrayOfNodes->RemoveElementAt(i);
}
else if (!mEditor->IsEditable(testNode))
{
arrayOfNodes->RemoveElementAt(i);
}
}
// if there is only one node in the array, and it is a list, div, or blockquote,
// then look inside of it until we find what we want to make a list out of.
arrayOfNodes->Count(&listCount);
if (listCount == 1)
{
nsCOMPtr<nsISupports> isupports = (dont_AddRef)(arrayOfNodes->ElementAt(0));
nsCOMPtr<nsIDOMNode> curNode( do_QueryInterface(isupports) );
while (IsDiv(curNode) || IsOrderedList(curNode) || IsUnorderedList(curNode) || IsBlockquote(curNode))
{
// dive as long as there is only one child, and it is a list, div, or blockquote
PRUint32 numChildren;
res = mEditor->CountEditableChildren(curNode, numChildren);
if (NS_FAILED(res)) return res;
if (numChildren == 1)
{
// keep diving
nsCOMPtr <nsIDOMNode> tmpNode = nsEditor::GetChildAt(curNode, 0);
if (IsDiv(tmpNode) || IsOrderedList(tmpNode) || IsUnorderedList(tmpNode) || IsBlockquote(tmpNode))
{
// check editablility XXX moose
curNode = tmpNode;
}
else break;
}
else break;
}
// we've found innermost list/blockquote/div:
// replace the one node in the array with this node
isupports = do_QueryInterface(curNode);
arrayOfNodes->ReplaceElementAt(isupports, 0);
}
// Next we detect all the transitions in the array, where a transition
// means that adjacent nodes in the array don't have the same parent.
nsVoidArray transitionList;
res = MakeTransitionList(arrayOfNodes, &transitionList);
if (NS_FAILED(res)) return res;
// Ok, now go through all the nodes and put then in the list,
// or whatever is approriate. Wohoo!
arrayOfNodes->Count(&listCount);
nsCOMPtr<nsIDOMNode> curParent;
nsCOMPtr<nsIDOMNode> curList;
for (i=0; i<listCount; i++)
{
// here's where we actually figure out what to do
nsCOMPtr<nsISupports> isupports = (dont_AddRef)(arrayOfNodes->ElementAt(i));
nsCOMPtr<nsIDOMNode> curNode( do_QueryInterface(isupports ) );
PRInt32 offset;
res = nsEditor::GetNodeLocation(curNode, &curParent, &offset);
if (NS_FAILED(res)) return res;
if (transitionList[i] && // transition node
((((i+1)<listCount) && transitionList[i+1]) || // and next node is transistion node
( i+1 >= listCount))) // or there is no next node
{
// the parent of this node has no other children on the
// list of nodes to make a list out of. So if this node
// is a list, change it's list type if needed instead of
// reparenting it
nsCOMPtr<nsIDOMNode> newBlock;
if (IsUnorderedList(curNode))
{
if (aOrdered)
{
// make a new ordered list, insert it where the current unordered list is,
// and move all the children to the new list, and remove the old list
nsAutoString blockType("ol");
res = ReplaceContainer(curNode,&newBlock,blockType);
if (NS_FAILED(res)) return res;
curList = newBlock;
continue;
}
else
{
// do nothing, we are already the right kind of list
curList = newBlock;
continue;
}
}
else if (IsOrderedList(curNode))
{
if (!aOrdered)
{
// make a new unordered list, insert it where the current ordered list is,
// and move all the children to the new list, and remove the old list
nsAutoString blockType("ul");
ReplaceContainer(curNode,&newBlock,blockType);
if (NS_FAILED(res)) return res;
curList = newBlock;
continue;
}
else
{
// do nothing, we are already the right kind of list
curList = newBlock;
continue;
}
}
else if (IsDiv(curNode) || IsBlockquote(curNode))
{
// XXX moose
}
} // lonely node
// need to make a list to put things in if we haven't already,
// or if this node doesn't go in list we used earlier.
if (!curList || transitionList[i])
{
nsAutoString listType;
if (aOrdered) listType = "ol";
else listType = "ul";
res = mEditor->CreateNode(listType, curParent, offset, getter_AddRefs(curList));
if (NS_FAILED(res)) return res;
// curList is now the correct thing to put curNode in
}
// if curNode isn't a list item, we must wrap it in one
nsCOMPtr<nsIDOMNode> listItem;
if (!IsListItem(curNode))
{
nsAutoString listItemType = "li";
res = InsertContainerAbove(curNode, &listItem, listItemType);
if (NS_FAILED(res)) return res;
}
else
{
listItem = curNode;
}
// tuck the listItem into the end of the active list
PRUint32 listLen;
res = mEditor->GetLengthOfDOMNode(curList, listLen);
if (NS_FAILED(res)) return res;
res = mEditor->DeleteNode(listItem);
if (NS_FAILED(res)) return res;
res = mEditor->InsertNode(listItem, curList, listLen);
if (NS_FAILED(res)) return res;
}
return res;
}
nsresult
nsHTMLEditRules::WillIndent(nsIDOMSelection *aSelection, PRBool *aCancel)
{
if (!aSelection || !aCancel) { return NS_ERROR_NULL_POINTER; }
// initialize out param
*aCancel = PR_TRUE;
nsAutoSelectionReset selectionResetter(aSelection);
nsresult res;
// convert the selection ranges into "promoted" selection ranges:
// this basically just expands the range to include the immediate
// block parent, and then further expands to include any ancestors
// whose children are all in the range
nsCOMPtr<nsISupportsArray> arrayOfRanges;
res = GetPromotedRanges(aSelection, &arrayOfRanges, kIndent);
if (NS_FAILED(res)) return res;
// use these ranges to contruct a list of nodes to act on.
nsCOMPtr<nsISupportsArray> arrayOfNodes;
res = GetNodesForOperation(arrayOfRanges, &arrayOfNodes, kIndent);
if (NS_FAILED(res)) return res;
// Next we detect all the transitions in the array, where a transition
// means that adjacent nodes in the array don't have the same parent.
nsVoidArray transitionList;
res = MakeTransitionList(arrayOfNodes, &transitionList);
if (NS_FAILED(res)) return res;
// Ok, now go through all the nodes and put them in a blockquote,
// or whatever is appropriate. Wohoo!
PRUint32 listCount;
PRInt32 i;
arrayOfNodes->Count(&listCount);
nsCOMPtr<nsIDOMNode> curParent;
nsCOMPtr<nsIDOMNode> curQuote;
for (i=0; i<listCount; i++)
{
// here's where we actually figure out what to do
nsCOMPtr<nsISupports> isupports = (dont_AddRef)(arrayOfNodes->ElementAt(i));
nsCOMPtr<nsIDOMNode> curNode( do_QueryInterface(isupports ) );
PRInt32 offset;
res = nsEditor::GetNodeLocation(curNode, &curParent, &offset);
if (NS_FAILED(res)) return res;
// need to make a blockquote to put things in if we haven't already,
// or if this node doesn't go in list we used earlier.
if (!curQuote || transitionList[i])
{
nsAutoString quoteType("blockquote");
if (mEditor->CanContainTag(curParent,quoteType))
{
res = mEditor->CreateNode(quoteType, curParent, offset, getter_AddRefs(curQuote));
if (NS_FAILED(res)) return res;
// curQuote is now the correct thing to put curNode in
}
else
{
printf("trying to put a blockquote in a bad place\n");
}
}
// tuck the node into the end of the active blockquote
PRUint32 listLen;
res = mEditor->GetLengthOfDOMNode(curQuote, listLen);
if (NS_FAILED(res)) return res;
res = mEditor->DeleteNode(curNode);
if (NS_FAILED(res)) return res;
res = mEditor->InsertNode(curNode, curQuote, listLen);
if (NS_FAILED(res)) return res;
}
return res;
}
nsresult
nsHTMLEditRules::WillOutdent(nsIDOMSelection *aSelection, PRBool *aCancel)
{
if (!aSelection || !aCancel) { return NS_ERROR_NULL_POINTER; }
// initialize out param
*aCancel = PR_TRUE;
nsAutoSelectionReset selectionResetter(aSelection);
nsresult res = NS_OK;
// convert the selection ranges into "promoted" selection ranges:
// this basically just expands the range to include the immediate
// block parent, and then further expands to include any ancestors
// whose children are all in the range
nsCOMPtr<nsISupportsArray> arrayOfRanges;
res = GetPromotedRanges(aSelection, &arrayOfRanges, kOutdent);
if (NS_FAILED(res)) return res;
// use these ranges to contruct a list of nodes to act on.
nsCOMPtr<nsISupportsArray> arrayOfNodes;
res = GetNodesForOperation(arrayOfRanges, &arrayOfNodes, kOutdent);
if (NS_FAILED(res)) return res;
// Next we detect all the transitions in the array, where a transition
// means that adjacent nodes in the array don't have the same parent.
nsVoidArray transitionList;
res = MakeTransitionList(arrayOfNodes, &transitionList);
if (NS_FAILED(res)) return res;
// Ok, now go through all the nodes and remove a level of blockquoting,
// or whatever is appropriate. Wohoo!
PRUint32 listCount;
PRInt32 i;
arrayOfNodes->Count(&listCount);
nsCOMPtr<nsIDOMNode> curParent;
for (i=0; i<listCount; i++)
{
// here's where we actually figure out what to do
nsCOMPtr<nsISupports> isupports = (dont_AddRef)(arrayOfNodes->ElementAt(i));
nsCOMPtr<nsIDOMNode> curNode( do_QueryInterface(isupports ) );
PRInt32 offset;
res = nsEditor::GetNodeLocation(curNode, &curParent, &offset);
if (NS_FAILED(res)) return res;
if (transitionList[i])
{
// look for a blockquote somewhere above us and remove it.
// this is a hack until i think about outdent for real.
nsCOMPtr<nsIDOMNode> n = curNode;
nsCOMPtr<nsIDOMNode> tmp;
while (!IsBody(n))
{
if (IsBlockquote(n))
{
RemoveContainer(n);
break;
}
n->GetParentNode(getter_AddRefs(tmp));
n = tmp;
}
}
}
return res;
}
nsresult
nsHTMLEditRules::WillAlign(nsIDOMSelection *aSelection, const nsString *alignType, PRBool *aCancel)
{
if (!aSelection || !aCancel) { return NS_ERROR_NULL_POINTER; }
// initialize out param
*aCancel = PR_TRUE;
nsAutoSelectionReset selectionResetter(aSelection);
nsresult res = NS_OK;
// convert the selection ranges into "promoted" selection ranges:
// this basically just expands the range to include the immediate
// block parent, and then further expands to include any ancestors
// whose children are all in the range
nsCOMPtr<nsISupportsArray> arrayOfRanges;
res = GetPromotedRanges(aSelection, &arrayOfRanges, kAlign);
if (NS_FAILED(res)) return res;
// use these ranges to contruct a list of nodes to act on.
nsCOMPtr<nsISupportsArray> arrayOfNodes;
res = GetNodesForOperation(arrayOfRanges, &arrayOfNodes, kAlign);
if (NS_FAILED(res)) return res;
// Next we detect all the transitions in the array, where a transition
// means that adjacent nodes in the array don't have the same parent.
nsVoidArray transitionList;
res = MakeTransitionList(arrayOfNodes, &transitionList);
if (NS_FAILED(res)) return res;
// Ok, now go through all the nodes and give them an align attrib or put them in a div,
// or whatever is appropriate. Wohoo!
PRUint32 listCount;
PRInt32 i;
arrayOfNodes->Count(&listCount);
nsCOMPtr<nsIDOMNode> curParent;
nsCOMPtr<nsIDOMNode> curDiv;
for (i=0; i<listCount; i++)
{
// here's where we actually figure out what to do
nsCOMPtr<nsISupports> isupports = (dont_AddRef)(arrayOfNodes->ElementAt(i));
nsCOMPtr<nsIDOMNode> curNode( do_QueryInterface(isupports ) );
PRInt32 offset;
res = nsEditor::GetNodeLocation(curNode, &curParent, &offset);
if (NS_FAILED(res)) return res;
// if it's a div, don't nest it, just set the alignment
if (IsDiv(curNode))
{
nsCOMPtr<nsIDOMElement> divElem = do_QueryInterface(curNode);
nsAutoString attr("align");
res = mEditor->SetAttribute(divElem, attr, *alignType);
if (NS_FAILED(res)) return res;
// clear out curDiv so that we don't put nodes after this one into it
curDiv = 0;
continue;
}
// need to make a div to put things in if we haven't already,
// or if this node doesn't go in div we used earlier.
if (!curDiv || transitionList[i])
{
nsAutoString divType("div");
res = mEditor->CreateNode(divType, curParent, offset, getter_AddRefs(curDiv));
if (NS_FAILED(res)) return res;
// set up the alignment on the div
nsCOMPtr<nsIDOMElement> divElem = do_QueryInterface(curDiv);
nsAutoString attr("align");
res = mEditor->SetAttribute(divElem, attr, *alignType);
if (NS_FAILED(res)) return res;
// curDiv is now the correct thing to put curNode in
}
// tuck the node into the end of the active div
PRUint32 listLen;
res = mEditor->GetLengthOfDOMNode(curDiv, listLen);
if (NS_FAILED(res)) return res;
res = mEditor->DeleteNode(curNode);
if (NS_FAILED(res)) return res;
res = mEditor->InsertNode(curNode, curDiv, listLen);
if (NS_FAILED(res)) return res;
}
return res;
}
nsresult
nsHTMLEditRules::WillMakeHeader(nsIDOMSelection *aSelection, PRBool *aCancel)
{
if (!aSelection || !aCancel) { return NS_ERROR_NULL_POINTER; }
// initialize out param
*aCancel = PR_FALSE;
nsresult res = NS_OK;
return res;
}
nsresult
nsHTMLEditRules::WillMakeAddress(nsIDOMSelection *aSelection, PRBool *aCancel)
{
if (!aSelection || !aCancel) { return NS_ERROR_NULL_POINTER; }
// initialize out param
*aCancel = PR_FALSE;
nsresult res = NS_OK;
return res;
}
nsresult
nsHTMLEditRules::WillMakePRE(nsIDOMSelection *aSelection, PRBool *aCancel)
{
if (!aSelection || !aCancel) { return NS_ERROR_NULL_POINTER; }
// initialize out param
*aCancel = PR_FALSE;
nsresult res = NS_OK;
return res;
}
/********************************************************
* helper methods
********************************************************/
///////////////////////////////////////////////////////////////////////////
// IsHeader: true if node an html header
//
PRBool
nsHTMLEditRules::IsHeader(nsIDOMNode *node)
{
NS_PRECONDITION(node, "null parent passed to nsHTMLEditRules::IsHeader");
nsAutoString tag;
nsEditor::GetTagString(node,tag);
if ( (tag == "h1") ||
(tag == "h2") ||
(tag == "h3") ||
(tag == "h4") ||
(tag == "h5") ||
(tag == "h6") )
{
return PR_TRUE;
}
return PR_FALSE;
}
///////////////////////////////////////////////////////////////////////////
// IsParagraph: true if node an html paragraph
//
PRBool
nsHTMLEditRules::IsParagraph(nsIDOMNode *node)
{
NS_PRECONDITION(node, "null parent passed to nsHTMLEditRules::IsParagraph");
nsAutoString tag;
nsEditor::GetTagString(node,tag);
if (tag == "p")
{
return PR_TRUE;
}
return PR_FALSE;
}
///////////////////////////////////////////////////////////////////////////
// IsListItem: true if node an html list item
//
PRBool
nsHTMLEditRules::IsListItem(nsIDOMNode *node)
{
NS_PRECONDITION(node, "null parent passed to nsHTMLEditRules::IsListItem");
nsAutoString tag;
nsEditor::GetTagString(node,tag);
if (tag == "li")
{
return PR_TRUE;
}
return PR_FALSE;
}
///////////////////////////////////////////////////////////////////////////
// IsOrderedList: true if node an html orderd list
//
PRBool
nsHTMLEditRules::IsOrderedList(nsIDOMNode *node)
{
NS_PRECONDITION(node, "null parent passed to nsHTMLEditRules::IsOrderedList");
nsAutoString tag;
nsEditor::GetTagString(node,tag);
if (tag == "ol")
{
return PR_TRUE;
}
return PR_FALSE;
}
///////////////////////////////////////////////////////////////////////////
// IsUnorderedList: true if node an html orderd list
//
PRBool
nsHTMLEditRules::IsUnorderedList(nsIDOMNode *node)
{
NS_PRECONDITION(node, "null parent passed to nsHTMLEditRules::IsUnorderedList");
nsAutoString tag;
nsEditor::GetTagString(node,tag);
if (tag == "ul")
{
return PR_TRUE;
}
return PR_FALSE;
}
///////////////////////////////////////////////////////////////////////////
// IsBreak: true if node an html break node
//
PRBool
nsHTMLEditRules::IsBreak(nsIDOMNode *node)
{
NS_PRECONDITION(node, "null parent passed to nsHTMLEditRules::IsBreak");
nsAutoString tag;
nsEditor::GetTagString(node,tag);
if (tag == "br")
{
return PR_TRUE;
}
return PR_FALSE;
}
///////////////////////////////////////////////////////////////////////////
// IsBody: true if node an html body node
//
PRBool
nsHTMLEditRules::IsBody(nsIDOMNode *node)
{
NS_PRECONDITION(node, "null parent passed to nsHTMLEditRules::IsBody");
nsAutoString tag;
nsEditor::GetTagString(node,tag);
if (tag == "body")
{
return PR_TRUE;
}
return PR_FALSE;
}
///////////////////////////////////////////////////////////////////////////
// IsBlockquote: true if node an html blockquote node
//
PRBool
nsHTMLEditRules::IsBlockquote(nsIDOMNode *node)
{
NS_PRECONDITION(node, "null parent passed to nsHTMLEditRules::IsBlockquote");
nsAutoString tag;
nsEditor::GetTagString(node,tag);
if (tag == "blockquote")
{
return PR_TRUE;
}
return PR_FALSE;
}
///////////////////////////////////////////////////////////////////////////
// IsDiv: true if node an html div node
//
PRBool
nsHTMLEditRules::IsDiv(nsIDOMNode *node)
{
NS_PRECONDITION(node, "null parent passed to nsHTMLEditRules::IsDiv");
nsAutoString tag;
nsEditor::GetTagString(node,tag);
if (tag == "div")
{
return PR_TRUE;
}
return PR_FALSE;
}
///////////////////////////////////////////////////////////////////////////
// GetTabAsNBSPs: stuff the right number of nbsp's into outString
//
nsresult
nsHTMLEditRules::GetTabAsNBSPs(nsString *outString)
{
if (!outString) return NS_ERROR_NULL_POINTER;
// XXX - this should get the right number from prefs
*outString += nbsp; *outString += nbsp; *outString += nbsp; *outString += nbsp;
return NS_OK;
}
///////////////////////////////////////////////////////////////////////////
// GetTabAsNBSPsAndSpace: stuff the right number of nbsp's followed by a
// space into outString
nsresult
nsHTMLEditRules::GetTabAsNBSPsAndSpace(nsString *outString)
{
if (!outString) return NS_ERROR_NULL_POINTER;
// XXX - this should get the right number from prefs
*outString += nbsp; *outString += nbsp; *outString += nbsp; *outString += ' ';
return NS_OK;
}
///////////////////////////////////////////////////////////////////////////
// IsFirstNode: Are we the first edittable node in our parent?
//
PRBool
nsHTMLEditRules::IsFirstNode(nsIDOMNode *aNode)
{
nsCOMPtr<nsIDOMNode> parent;
PRInt32 offset, j=0;
nsEditor::GetNodeLocation(aNode, &parent, &offset);
if (!offset) // easy case, we are first dom child
return PR_TRUE;
// ok, so there are earlier children. But are they editable???
nsCOMPtr<nsIDOMNodeList>childList;
nsCOMPtr<nsIDOMNode> child;
parent->GetChildNodes(getter_AddRefs(childList));
while (j < offset)
{
childList->Item(j, getter_AddRefs(child));
if (mEditor->IsEditable(child))
return PR_FALSE;
j++;
}
return PR_TRUE;
}
///////////////////////////////////////////////////////////////////////////
// IsLastNode: Are we the first edittable node in our parent?
//
PRBool
nsHTMLEditRules::IsLastNode(nsIDOMNode *aNode)
{
nsCOMPtr<nsIDOMNode> parent;
PRInt32 offset, j;
PRUint32 numChildren;
nsEditor::GetNodeLocation(aNode, &parent, &offset);
nsEditor::GetLengthOfDOMNode(parent, numChildren);
if (offset+1 == numChildren) // easy case, we are last dom child
return PR_TRUE;
// ok, so there are later children. But are they editable???
j = offset+1;
nsCOMPtr<nsIDOMNodeList>childList;
nsCOMPtr<nsIDOMNode> child;
parent->GetChildNodes(getter_AddRefs(childList));
while (j < numChildren)
{
childList->Item(j, getter_AddRefs(child));
if (mEditor->IsEditable(child))
return PR_FALSE;
j++;
}
return PR_TRUE;
}
///////////////////////////////////////////////////////////////////////////
// GetPromotedPoint: figure out where a start or end point for a block
// operation really is
nsresult
nsHTMLEditRules::GetPromotedPoint(RulesEndpoint aWhere, nsIDOMNode *aNode, PRInt32 aOffset,
PRInt32 actionID, nsCOMPtr<nsIDOMNode> *outNode, PRInt32 *outOffset)
{
nsresult res = NS_OK;
nsCOMPtr<nsIDOMNode> node = aNode;
nsCOMPtr<nsIDOMNode> parent = aNode;
PRInt32 offset = aOffset;
if (aWhere == kStart)
{
// some special casing for text nodes
if (nsEditor::IsTextNode(aNode))
{
nsEditor::GetNodeLocation(aNode, &parent, &offset);
}
else
{
node = nsEditor::GetChildAt(parent,offset);
}
// finding the real start for this point. look up the tree for as long as we are the
// first node in the container, and as long as we haven't hit the body node.
while ((IsFirstNode(node)) && (!IsBody(parent)))
{
node = parent;
res = nsEditor::GetNodeLocation(node, &parent, &offset);
if (NS_FAILED(res)) return res;
}
*outNode = parent;
*outOffset = offset;
return res;
}
if (aWhere == kEnd)
{
// some special casing for text nodes
if (nsEditor::IsTextNode(aNode))
{
nsEditor::GetNodeLocation(aNode, &parent, &offset);
}
else
{
node = nsEditor::GetChildAt(parent,offset);
}
offset++; // since this is going to be used for a range _endpoint_, we want to be after the node
// finding the real end for this point. look up the tree for as long as we are the
// last node in the container, and as long as we haven't hit the body node.
while ((IsLastNode(node)) && (!IsBody(parent)))
{
node = parent;
res = nsEditor::GetNodeLocation(node, &parent, &offset);
if (NS_FAILED(res)) return res;
offset++;
}
*outNode = parent;
*outOffset = offset;
return res;
}
return res;
}
///////////////////////////////////////////////////////////////////////////
// GetPromotedRanges: run all the selection range endpoint through
// GetPromotedPoint()
//
nsresult
nsHTMLEditRules::GetPromotedRanges(nsIDOMSelection *inSelection,
nsCOMPtr<nsISupportsArray> *outArrayOfRanges,
PRInt32 inOperationType)
{
if (!inSelection || !outArrayOfRanges) return NS_ERROR_NULL_POINTER;
nsresult res = NS_NewISupportsArray(getter_AddRefs(*outArrayOfRanges));
if (NS_FAILED(res)) return res;
PRInt32 rangeCount;
res = inSelection->GetRangeCount(&rangeCount);
if (NS_FAILED(res)) return res;
PRInt32 i;
nsCOMPtr<nsIDOMRange> selectionRange;
nsCOMPtr<nsIDOMNode> startNode;
nsCOMPtr<nsIDOMNode> endNode;
PRInt32 startOffset, endOffset;
for (i = 0; i < rangeCount; i++)
{
res = inSelection->GetRangeAt(i, getter_AddRefs(selectionRange));
if (NS_FAILED(res)) return res;
res = selectionRange->GetStartParent(getter_AddRefs(startNode));
if (NS_FAILED(res)) return res;
res = selectionRange->GetStartOffset(&startOffset);
if (NS_FAILED(res)) return res;
res = selectionRange->GetEndParent(getter_AddRefs(endNode));
if (NS_FAILED(res)) return res;
res = selectionRange->GetEndOffset(&endOffset);
if (NS_FAILED(res)) return res;
// make a new adjusted range to represent the appropriate block content
// this is tricky. the basic idea is to push out the range endpoints
// to truly enclose the blocks that we will affect
nsCOMPtr<nsIDOMNode> opStartNode;
nsCOMPtr<nsIDOMNode> opEndNode;
PRInt32 opStartOffset, opEndOffset;
nsCOMPtr<nsIDOMRange> opRange;
res = GetPromotedPoint( kStart, startNode, startOffset, inOperationType, &opStartNode, &opStartOffset);
if (NS_FAILED(res)) return res;
res = GetPromotedPoint( kEnd, endNode, endOffset, inOperationType, &opEndNode, &opEndOffset);
if (NS_FAILED(res)) return res;
res = selectionRange->Clone(getter_AddRefs(opRange));
if (NS_FAILED(res)) return res;
opRange->SetStart(opStartNode, opStartOffset);
if (NS_FAILED(res)) return res;
opRange->SetEnd(opEndNode, opEndOffset);
if (NS_FAILED(res)) return res;
// stuff new opRange into nsISupportsArray
nsCOMPtr<nsISupports> isupports = do_QueryInterface(opRange);
(*outArrayOfRanges)->AppendElement(isupports);
}
return res;
}
///////////////////////////////////////////////////////////////////////////
// GetNodesForOperation: run through the ranges in the array and construct
// a new array of nodes to be acted on.
//
nsresult
nsHTMLEditRules::GetNodesForOperation(nsISupportsArray *inArrayOfRanges,
nsCOMPtr<nsISupportsArray> *outArrayOfNodes,
PRInt32 inOperationType)
{
if (!inArrayOfRanges || !outArrayOfNodes) return NS_ERROR_NULL_POINTER;
nsresult res = NS_NewISupportsArray(getter_AddRefs(*outArrayOfNodes));
if (NS_FAILED(res)) return res;
PRUint32 rangeCount;
res = inArrayOfRanges->Count(&rangeCount);
if (NS_FAILED(res)) return res;
PRInt32 i;
nsCOMPtr<nsIDOMRange> opRange;
nsCOMPtr<nsISupports> isupports;
nsCOMPtr<nsIContentIterator> iter;
for (i = 0; i < rangeCount; i++)
{
isupports = (dont_AddRef)(inArrayOfRanges->ElementAt(i));
opRange = do_QueryInterface(isupports);
res = nsComponentManager::CreateInstance(kSubtreeIteratorCID,
nsnull,
nsIContentIterator::GetIID(),
getter_AddRefs(iter));
if (NS_FAILED(res)) return res;
res = iter->Init(opRange);
if (NS_FAILED(res)) return res;
while (NS_COMFALSE == iter->IsDone())
{
nsCOMPtr<nsIDOMNode> node;
nsCOMPtr<nsIContent> content;
res = iter->CurrentNode(getter_AddRefs(content));
node = do_QueryInterface(content);
if ((NS_SUCCEEDED(res)) && node)
{
isupports = do_QueryInterface(node);
(*outArrayOfNodes)->AppendElement(isupports);
}
res = iter->Next();
if (NS_FAILED(res)) return res;
}
}
return res;
}
///////////////////////////////////////////////////////////////////////////
// MakeTransitionList: detect all the transitions in the array, where a
// transition means that adjacent nodes in the array
// don't have the same parent.
//
nsresult
nsHTMLEditRules::MakeTransitionList(nsISupportsArray *inArrayOfNodes,
nsVoidArray *inTransitionArray)
{
if (!inArrayOfNodes || !inTransitionArray) return NS_ERROR_NULL_POINTER;
PRUint32 listCount;
PRInt32 i;
inArrayOfNodes->Count(&listCount);
nsVoidArray transitionList;
nsCOMPtr<nsIDOMNode> prevElementParent;
nsCOMPtr<nsIDOMNode> curElementParent;
for (i=0; i<listCount; i++)
{
nsCOMPtr<nsISupports> isupports = (dont_AddRef)(inArrayOfNodes->ElementAt(i));
nsCOMPtr<nsIDOMNode> transNode( do_QueryInterface(isupports ) );
transNode->GetParentNode(getter_AddRefs(curElementParent));
if (curElementParent != prevElementParent)
{
inTransitionArray->InsertElementAt((void*)PR_TRUE,i); // different parents: transition point
}
else
{
inTransitionArray->InsertElementAt((void*)PR_FALSE,i); // same parents: these nodes grew up together
}
prevElementParent = curElementParent;
}
return NS_OK;
}
///////////////////////////////////////////////////////////////////////////
// ReplaceContainer: replace inNode with a new node (outNode) which is contructed
// to be of type aNodeType. Put inNodes children into outNode.
// Callers responsibility to make sure inNode's children can
// go in outNode.
nsresult
nsHTMLEditRules::ReplaceContainer(nsIDOMNode *inNode,
nsCOMPtr<nsIDOMNode> *outNode,
nsString &aNodeType)
{
if (!inNode || !outNode)
return NS_ERROR_NULL_POINTER;
nsresult res;
nsCOMPtr<nsIDOMNode> parent;
PRInt32 offset;
res = nsEditor::GetNodeLocation(inNode, &parent, &offset);
if (NS_FAILED(res)) return res;
res = mEditor->CreateNode(aNodeType, parent, offset, getter_AddRefs(*outNode));
if (NS_FAILED(res)) return res;
PRBool bHasMoreChildren;
inNode->HasChildNodes(&bHasMoreChildren);
nsCOMPtr<nsIDOMNode> child;
offset = 0;
while (bHasMoreChildren)
{
inNode->GetFirstChild(getter_AddRefs(child));
res = mEditor->DeleteNode(child);
if (NS_FAILED(res)) return res;
res = mEditor->InsertNode(child, *outNode, offset);
if (NS_FAILED(res)) return res;
inNode->HasChildNodes(&bHasMoreChildren);
offset++;
}
res = mEditor->DeleteNode(inNode);
return res;
}
///////////////////////////////////////////////////////////////////////////
// RemoveContainer: remove inNode, reparenting it's children into their
// the parent of inNode
//
nsresult
nsHTMLEditRules::RemoveContainer(nsIDOMNode *inNode)
{
if (!inNode)
return NS_ERROR_NULL_POINTER;
if (IsBody(inNode))
return NS_ERROR_UNEXPECTED;
nsresult res;
nsCOMPtr<nsIDOMNode> parent;
PRInt32 offset;
res = nsEditor::GetNodeLocation(inNode, &parent, &offset);
if (NS_FAILED(res)) return res;
PRBool bHasMoreChildren;
inNode->HasChildNodes(&bHasMoreChildren);
nsCOMPtr<nsIDOMNode> child;
while (bHasMoreChildren)
{
inNode->GetLastChild(getter_AddRefs(child));
res = mEditor->DeleteNode(child);
if (NS_FAILED(res)) return res;
res = mEditor->InsertNode(child, parent, offset);
if (NS_FAILED(res)) return res;
inNode->HasChildNodes(&bHasMoreChildren);
}
res = mEditor->DeleteNode(inNode);
return res;
}
///////////////////////////////////////////////////////////////////////////
// InsertContainerAbove: insert a new parent for inNode, returned in outNode,
// which is contructed to be of type aNodeType. outNode becomes
// a child of inNode's earlier parent.
// Callers responsibility to make sure inNode's can be child
// of outNode, and outNode can be child of old parent.
nsresult
nsHTMLEditRules::InsertContainerAbove(nsIDOMNode *inNode,
nsCOMPtr<nsIDOMNode> *outNode,
nsString &aNodeType)
{
if (!inNode || !outNode)
return NS_ERROR_NULL_POINTER;
nsresult res;
nsCOMPtr<nsIDOMNode> parent;
PRInt32 offset;
res = nsEditor::GetNodeLocation(inNode, &parent, &offset);
if (NS_FAILED(res)) return res;
// make new parent, outNode
res = mEditor->CreateNode(aNodeType, parent, offset, getter_AddRefs(*outNode));
if (NS_FAILED(res)) return res;
// put inNode in new parent, outNode
res = mEditor->DeleteNode(inNode);
if (NS_FAILED(res)) return res;
res = mEditor->InsertNode(inNode, *outNode, 0);
if (NS_FAILED(res)) return res;
return NS_OK;
}
/********************************************************
* main implementation methods
********************************************************/
///////////////////////////////////////////////////////////////////////////
// InsertTab: top level logic for determining how to insert a tab
//
nsresult
nsHTMLEditRules::InsertTab(nsIDOMSelection *aSelection,
PRBool *aCancel,
PlaceholderTxn **aTxn,
nsString *outString)
{
nsCOMPtr<nsIDOMNode> parentNode;
PRInt32 offset;
PRBool isPRE;
PRBool isNextWhiteSpace;
PRBool isPrevWhiteSpace;
nsresult result = mEditor->GetStartNodeAndOffset(aSelection, &parentNode, &offset);
if (NS_FAILED(result)) return result;
if (!parentNode) return NS_ERROR_FAILURE;
result = mEditor->IsPreformatted(parentNode,&isPRE);
if (NS_FAILED(result)) return result;
if (isPRE)
{
*outString += '\t';
return NS_OK;
}
result = mEditor->IsNextCharWhitespace(parentNode, offset, &isNextWhiteSpace);
if (NS_FAILED(result)) return result;
result = mEditor->IsPrevCharWhitespace(parentNode, offset, &isPrevWhiteSpace);
if (NS_FAILED(result)) return result;
if (isPrevWhiteSpace)
{
// prev character is a whitespace; Need to
// insert nbsp's BEFORE the space
// XXX for now put tab in wrong place
if (isNextWhiteSpace)
{
GetTabAsNBSPs(outString);
return NS_OK;
}
GetTabAsNBSPsAndSpace(outString);
return NS_OK;
}
if (isNextWhiteSpace)
{
// character after us is ws. insert nbsps
GetTabAsNBSPs(outString);
return NS_OK;
}
// else we are in middle of a word; use n-1 nbsp's plus a space
GetTabAsNBSPsAndSpace(outString);
return NS_OK;
}
///////////////////////////////////////////////////////////////////////////
// InsertSpace: top level logic for determining how to insert a space
//
nsresult
nsHTMLEditRules::InsertSpace(nsIDOMSelection *aSelection,
PRBool *aCancel,
PlaceholderTxn **aTxn,
nsString *outString)
{
nsCOMPtr<nsIDOMNode> parentNode;
PRInt32 offset;
PRBool isPRE;
PRBool isNextWhiteSpace;
PRBool isPrevWhiteSpace;
nsresult result = mEditor->GetStartNodeAndOffset(aSelection, &parentNode, &offset);
if (NS_FAILED(result)) return result;
if (!parentNode) return NS_ERROR_FAILURE;
result = mEditor->IsPreformatted(parentNode,&isPRE);
if (NS_FAILED(result)) return result;
if (isPRE)
{
*outString += " ";
return NS_OK;
}
result = mEditor->IsNextCharWhitespace(parentNode, offset, &isNextWhiteSpace);
if (NS_FAILED(result)) return result;
result = mEditor->IsPrevCharWhitespace(parentNode, offset, &isPrevWhiteSpace);
if (NS_FAILED(result)) return result;
if (isPrevWhiteSpace)
{
// prev character is a whitespace; Need to
// insert nbsp BEFORE the space
// XXX for now put in wrong place
if (isNextWhiteSpace)
{
*outString += nbsp;
return NS_OK;
}
*outString += nbsp;
return NS_OK;
}
if (isNextWhiteSpace)
{
// character after us is ws. insert nbsp
*outString += nbsp;
return NS_OK;
}
// else just a space
*outString += " ";
return NS_OK;
}
///////////////////////////////////////////////////////////////////////////
// ReturnInHeader: do the right thing for returns pressed in headers
//
nsresult
nsHTMLEditRules::ReturnInHeader(nsIDOMSelection *aSelection,
nsIDOMNode *aHeader,
nsIDOMNode *aTextNode,
PRInt32 aOffset)
{
if (!aSelection || !aHeader || !aTextNode) return NS_ERROR_NULL_POINTER;
nsCOMPtr<nsIDOMNode> leftNode;
nsCOMPtr<nsIDOMNode> textNode = do_QueryInterface(aTextNode); // to hold a ref across the delete call
// split the node
nsresult res = mEditor->SplitNode(aTextNode, aOffset, getter_AddRefs(leftNode));
if (NS_FAILED(res)) return res;
// move the right node outside of the header, via deletion/insertion
// delete the right node
res = mEditor->DeleteNode(textNode);
if (NS_FAILED(res)) return res;
// insert the right node
nsCOMPtr<nsIDOMNode> p;
aHeader->GetParentNode(getter_AddRefs(p));
PRInt32 indx = mEditor->GetIndexOf(p,aHeader);
res = mEditor->InsertNode(textNode,p,indx+1);
if (NS_FAILED(res)) return res;
// merge text node with like sibling, if any
nsCOMPtr<nsIDOMNode> sibling;
textNode->GetNextSibling(getter_AddRefs(sibling));
if (sibling && mEditor->IsTextNode(sibling) && mEditor->IsEditable(sibling))
{
res = mEditor->JoinNodes(textNode,sibling,p);
if (NS_FAILED(res)) return res;
textNode = sibling; // sibling was the node kept by the join; remember it in "textNode"
}
// position selection before inserted node
res = aSelection->Collapse(textNode,0);
return res;
}
///////////////////////////////////////////////////////////////////////////
// ReturnInParagraph: do the right thing for returns pressed in paragraphs
//
nsresult
nsHTMLEditRules::ReturnInParagraph(nsIDOMSelection *aSelection,
nsIDOMNode *aHeader,
nsIDOMNode *aNode,
PRInt32 aOffset,
PRBool *aCancel)
{
if (!aSelection || !aHeader || !aNode || !aCancel) return NS_ERROR_NULL_POINTER;
*aCancel = PR_FALSE;
nsCOMPtr<nsIDOMNode> sibling;
nsresult res = NS_OK;
//bombs away - nuking this for now...
#if 0
// easy case, in a text node:
if (mEditor->IsTextNode(aNode))
{
nsCOMPtr<nsIDOMText> textNode = do_QueryInterface(aNode);
PRUint32 strLength;
res = textNode->GetLength(&strLength);
if (NS_FAILED(res)) return res;
// at beginning of text node?
if (!aOffset)
{
// is there a BR prior to it?
aNode->GetPreviousSibling(getter_AddRefs(sibling));
if (!sibling)
{
// no previous sib, so
// just fall out to default of inserting a BR
return res;
}
if (IsBreak(sibling))
{
*aCancel = PR_TRUE;
// get rid of the break
res = mEditor->DeleteNode(sibling);
if (NS_FAILED(res)) return res;
// split the paragraph
res = mEditor->SplitNodeDeep( aHeader, aNode, aOffset);
if (NS_FAILED(res)) return res;
// position selection inside textnode
res = aSelection->Collapse(aNode,0);
}
// else just fall out to default of inserting a BR
return res;
}
// at end of text node?
if (aOffset == strLength)
{
// is there a BR after to it?
res = aNode->GetNextSibling(getter_AddRefs(sibling));
if (!sibling)
{
// no next sib, so
// just fall out to default of inserting a BR
return res;
}
if (IsBreak(sibling))
{
*aCancel = PR_TRUE;
// get rid of the break
res = mEditor->DeleteNode(sibling);
if (NS_FAILED(res)) return res;
// split the paragraph
res = mEditor->SplitNodeDeep( aHeader, aNode, aOffset);
if (NS_FAILED(res)) return res;
// position selection inside textnode
res = aSelection->Collapse(aNode,0);
}
// else just fall out to default of inserting a BR
return res;
}
// inside text node
// just fall out to default of inserting a BR
return res;
}
// not in a text node. are we next to BR's?
// XXX
#endif
return res;
}
///////////////////////////////////////////////////////////////////////////
// ReturnInListItem: do the right thing for returns pressed in list items
//
nsresult
nsHTMLEditRules::ReturnInListItem(nsIDOMSelection *aSelection,
nsIDOMNode *aListItem,
nsIDOMNode *aNode,
PRInt32 aOffset)
{
if (!aSelection || !aListItem || !aNode) return NS_ERROR_NULL_POINTER;
nsresult res = mEditor->SplitNodeDeep( aListItem, aNode, aOffset);
if (NS_FAILED(res)) return res;
res = aSelection->Collapse(aNode,0);
return res;
}
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