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pjs/extensions/xforms/nsXFormsMDGEngine.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** 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 Mozilla XForms support.
*
* The Initial Developer of the Original Code is
* Novell, Inc.
* Portions created by the Initial Developer are Copyright (C) 2004
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Allan Beaufour <abeaufour@novell.com>
* David Landwehr <dlandwehr@novell.com>
*
* 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 ***** */
#include "nsXFormsMDGEngine.h"
#include "nsIDOMDocument.h"
#include "nsIDOMNodeList.h"
#include "nsIDOMText.h"
#include "nsIDOMNSXPathExpression.h"
#include "nsIDOMXPathResult.h"
#include "nsDeque.h"
#include "nsXFormsUtils.h"
#include "nsDOMError.h"
#include "nsIDOMElement.h"
#include "nsXFormsModelElement.h"
#ifdef DEBUG
//# define DEBUG_XF_MDG
const char* gMIPNames[] = {"type",
"r/o",
"req",
"rel",
"calc",
"const",
"p3ptype"
};
#endif
/* ------------------------------------ */
/* --------- nsXFormsMDGNode ---------- */
/* ------------------------------------ */
nsXFormsMDGNode::nsXFormsMDGNode(nsIDOMNode *aNode,
const ModelItemPropName aType)
: mDirty (PR_TRUE), mHasExpr(PR_FALSE), mContextNode(aNode),
mCount(0), mType(aType), mContextSize(0), mContextPosition(0),
mDynFunc(PR_FALSE), mNext(nsnull)
{
MOZ_COUNT_CTOR(nsXFormsMDGNode);
}
nsXFormsMDGNode::~nsXFormsMDGNode()
{
MOZ_COUNT_DTOR(nsXFormsMDGNode);
}
void
nsXFormsMDGNode::SetExpression(nsIDOMNSXPathExpression *aExpression,
PRBool aDynFunc,
PRInt32 aContextPosition,
PRInt32 aContextSize)
{
mHasExpr = PR_TRUE;
mDynFunc = aDynFunc;
mExpression = aExpression;
mContextPosition = aContextPosition;
mContextSize = aContextSize;
}
PRBool
nsXFormsMDGNode::HasExpr() const
{
return mHasExpr;
}
PRBool
nsXFormsMDGNode::IsDirty() const
{
// A node is always dirty, if it depends on a dynamic function.
return mDirty || mDynFunc;
}
void
nsXFormsMDGNode::MarkDirty()
{
mDirty = PR_TRUE;
}
void
nsXFormsMDGNode::MarkClean()
{
mDirty = PR_FALSE;
}
/* ------------------------------------ */
/* -------- nsXFormsMDGEngine --------- */
/* ------------------------------------ */
nsXFormsMDGEngine::nsXFormsMDGEngine()
: mNodesInGraph(0)
{
MOZ_COUNT_CTOR(nsXFormsMDGEngine);
}
nsXFormsMDGEngine::~nsXFormsMDGEngine()
{
mNodeToMDG.Enumerate(DeleteLinkedNodes, nsnull);
MOZ_COUNT_DTOR(nsXFormsMDGEngine);
}
nsresult
nsXFormsMDGEngine::Init(nsXFormsModelElement *aModel)
{
nsresult rv = NS_ERROR_FAILURE;
if (mNodeStates.Init() && mNodeToMDG.Init()) {
rv = NS_OK;
}
mModel = aModel;
return rv;
}
nsresult
nsXFormsMDGEngine::AddMIP(ModelItemPropName aType,
nsIDOMNSXPathExpression *aExpression,
nsCOMArray<nsIDOMNode> *aDependencies,
PRBool aDynFunc,
nsIDOMNode *aContextNode,
PRInt32 aContextPos,
PRInt32 aContextSize)
{
NS_ENSURE_ARG(aContextNode);
#ifdef DEBUG_XF_MDG
nsAutoString nodename;
aContextNode->GetNodeName(nodename);
printf("nsXFormsMDGEngine::AddMIP(aContextNode=%s, aExpression=%p, aDependencies=|%d|,\n",
NS_ConvertUTF16toUTF8(nodename).get(),
(void*) aExpression,
aDependencies ? aDependencies->Count() : 0);
printf(" aContextPos=%d, aContextSize=%d, aType=%s, aDynFunc=%d)\n",
aContextPos, aContextSize, gMIPNames[aType], aDynFunc);
#endif
nsXFormsMDGNode* newnode = GetNode(aContextNode,
aType,
PR_TRUE);
if (!newnode) {
return NS_ERROR_OUT_OF_MEMORY;
}
if (newnode->HasExpr()) {
// MIP already in the graph. That is, there is already a MIP of the same
// type for this node, which is illegal.
// Example: <bind nodeset="x" required="true()" required="false()"/>
return NS_ERROR_ABORT;
}
if (aExpression) {
newnode->SetExpression(aExpression, aDynFunc, aContextPos, aContextSize);
}
// Add dependencies
if (aDependencies) {
nsCOMPtr<nsIDOMNode> dep_domnode;
nsXFormsMDGNode* dep_gnode;
for (PRInt32 i = 0; i < aDependencies->Count(); ++i) {
dep_domnode = aDependencies->ObjectAt(i);
if (!dep_domnode) {
return NS_ERROR_NULL_POINTER;
}
#ifdef DEBUG_XF_MDG
printf("\tDependency #%2d: %p\n", i, (void*) dep_domnode);
#endif
// Get calculate graph node for the dependency (only a calculate
// property can influence another MIP).
dep_gnode = GetNode(dep_domnode, eModel_calculate);
if (!dep_gnode) {
return NS_ERROR_OUT_OF_MEMORY;
}
if (dep_gnode->mType == aType && dep_gnode->mContextNode == aContextNode) {
// Reference to itself, ignore
continue;
}
// Add this node as a successor to the dependency (ie. the dependency
// should be (re-)calculated before this node)
dep_gnode->mSuc.AppendElement(newnode);
newnode->mCount++;
}
}
return NS_OK;
}
nsresult
nsXFormsMDGEngine::MarkNodeAsChanged(nsIDOMNode* aContextNode)
{
return mMarkedNodes.AppendObject(aContextNode);
}
nsresult
nsXFormsMDGEngine::HandleMarkedNodes(nsCOMArray<nsIDOMNode> *aArray)
{
NS_ENSURE_ARG_POINTER(aArray);
// Handle nodes marked as changed
for (PRInt32 i = 0; i < mMarkedNodes.Count(); ++i) {
nsCOMPtr<nsIDOMNode> node = mMarkedNodes.ObjectAt(i);
nsXFormsNodeState* ns = GetNCNodeState(node);
NS_ENSURE_TRUE(ns, NS_ERROR_FAILURE);
ns->Set(kFlags_ALL_DISPATCH, PR_TRUE);
// Get the node, eMode_type == get any type of node
nsXFormsMDGNode* n = GetNode(node, eModel_type, PR_FALSE);
if (n) {
while (n) {
n->MarkDirty();
n = n->mNext;
}
} else {
// Add constraint to trigger validation of node
n = GetNode(node, eModel_constraint, PR_TRUE);
if (!n) {
return NS_ERROR_OUT_OF_MEMORY;
}
n->MarkDirty();
NS_ENSURE_TRUE(mGraph.AppendElement(n), NS_ERROR_OUT_OF_MEMORY);
}
NS_ENSURE_TRUE(aArray->AppendObjects(mMarkedNodes),
NS_ERROR_OUT_OF_MEMORY);
}
mMarkedNodes.Clear();
return NS_OK;
}
#ifdef DEBUG_beaufour
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
void
nsXFormsMDGEngine::PrintDot(const char* aFile)
{
FILE *FD = stdout;
if (aFile) {
FD = fopen(aFile, "w");
}
fprintf(FD, "digraph {\n");
for (PRInt32 i = 0; i < mGraph.Count(); ++i) {
nsXFormsMDGNode* g = NS_STATIC_CAST(nsXFormsMDGNode*, mGraph[i]);
if (g) {
nsAutoString domNodeName;
g->mContextNode->GetNodeName(domNodeName);
if (g->IsDirty()) {
fprintf(FD, "\t%s [color=red];\n",
NS_ConvertUTF16toUTF8(domNodeName).get());
}
for (PRInt32 j = 0; j < g->mSuc.Count(); ++j) {
nsXFormsMDGNode* sucnode = NS_STATIC_CAST(nsXFormsMDGNode*,
g->mSuc[j]);
if (sucnode) {
nsAutoString sucName;
sucnode->mContextNode->GetNodeName(sucName);
fprintf(FD, "\t%s -> %s [label=\"%s\"];\n",
NS_ConvertUTF16toUTF8(sucName).get(),
NS_ConvertUTF16toUTF8(domNodeName).get(),
gMIPNames[sucnode->mType]);
}
}
}
}
fprintf(FD, "}\n");
if (FD) {
fclose(FD);
}
}
#endif
nsresult
nsXFormsMDGEngine::Recalculate(nsCOMArray<nsIDOMNode> *aChangedNodes)
{
NS_ENSURE_ARG(aChangedNodes);
#ifdef DEBUG_XF_MDG
printf("nsXFormsMDGEngine::Recalculcate(aChangedNodes=|%d|)\n",
aChangedNodes->Count());
#endif
// XXX: There's something wrong with the marking of nodes, as we assume that
// recalculate will always be called first. bug 338146
nsresult rv = HandleMarkedNodes(aChangedNodes);
NS_ENSURE_SUCCESS(rv, rv);
PRBool res = PR_TRUE;
mFirstCalculate = mJustRebuilt;
#ifdef DEBUG_XF_MDG
printf("\taChangedNodes: %d\n", aChangedNodes->Count());
printf("\tmNodeToMDG: %d\n", mNodeToMDG.Count());
printf("\tmNodeStates: %d\n", mNodeStates.Count());
printf("\tGraph nodes: %d\n", mGraph.Count());
#endif
// Go through all dirty nodes in the graph
nsXFormsMDGNode* g;
for (PRInt32 i = 0; i < mGraph.Count(); ++i) {
g = NS_STATIC_CAST(nsXFormsMDGNode*, mGraph[i]);
if (!g) {
NS_WARNING("nsXFormsMDGEngine::Calculcate(): Empty node in graph!!!");
continue;
}
NS_ASSERTION(g->mCount == 0,
"nsXFormsMDGEngine::Calculcate(): Graph node with mCount != 0");
#ifdef DEBUG_XF_MDG
nsAutoString domNodeName;
g->mContextNode->GetNodeName(domNodeName);
printf("\tNode #%d: This=%p, Dirty=%d, DynFunc=%d, Type=%d, Count=%d, Suc=%d, CSize=%d, CPos=%d, Next=%p, domnode=%s\n",
i, (void*) g, g->IsDirty(), g->mDynFunc, g->mType,
g->mCount, g->mSuc.Count(), g->mContextSize, g->mContextPosition,
(void*) g->mNext, NS_ConvertUTF16toUTF8(domNodeName).get());
#endif
// Ignore node if it is not dirty
if (!g->IsDirty()) {
continue;
}
nsXFormsNodeState* ns = GetNCNodeState(g->mContextNode);
NS_ENSURE_TRUE(ns, NS_ERROR_FAILURE);
PRBool constraint = PR_TRUE;
PRBool conChanged;
// Find MIP-type and handle it accordingly
switch (g->mType) {
case eModel_calculate:
if (g->HasExpr()) {
nsCOMPtr<nsISupports> result;
rv = g->mExpression->EvaluateWithContext(g->mContextNode,
g->mContextPosition,
g->mContextSize,
nsIDOMXPathResult::STRING_TYPE,
nsnull,
getter_AddRefs(result));
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIDOMXPathResult> xpath_res = do_QueryInterface(result);
NS_ENSURE_STATE(xpath_res);
nsAutoString nodeval;
rv = xpath_res->GetStringValue(nodeval);
NS_ENSURE_SUCCESS(rv, rv);
rv = SetNodeValueInternal(g->mContextNode,
nodeval,
PR_FALSE,
PR_TRUE);
if (NS_SUCCEEDED(rv)) {
NS_ENSURE_TRUE(aChangedNodes->AppendObject(g->mContextNode),
NS_ERROR_FAILURE);
}
}
ns->Set(eFlag_DISPATCH_VALUE_CHANGED, PR_TRUE);
break;
case eModel_constraint:
if (g->HasExpr()) {
rv = BooleanExpression(g, constraint);
NS_ENSURE_SUCCESS(rv, rv);
}
conChanged = ns->IsConstraint() != constraint;
// On the first calculate after a rebuild (mFirstCalculate) we also
// add constraints to the set of changed nodes to trigger validation
// of type information if present.
if (conChanged || mFirstCalculate) {
if (conChanged) {
ns->Set(eFlag_CONSTRAINT, constraint);
ns->Set(eFlag_DISPATCH_VALID_CHANGED, PR_TRUE);
}
NS_ENSURE_TRUE(aChangedNodes->AppendObject(g->mContextNode),
NS_ERROR_FAILURE);
}
break;
case eModel_readonly:
if (g->HasExpr()) {
rv = ComputeMIPWithInheritance(eFlag_READONLY,
eFlag_DISPATCH_READONLY_CHANGED,
eFlag_INHERITED_READONLY,
g,
aChangedNodes);
NS_ENSURE_SUCCESS(rv, rv);
}
break;
case eModel_relevant:
if (g->HasExpr()) {
rv = ComputeMIPWithInheritance(eFlag_RELEVANT,
eFlag_DISPATCH_RELEVANT_CHANGED,
eFlag_INHERITED_RELEVANT,
g,
aChangedNodes);
NS_ENSURE_SUCCESS(rv, rv);
}
break;
case eModel_required:
if (g->HasExpr()) {
PRBool didChange;
rv = ComputeMIP(eFlag_REQUIRED,
eFlag_DISPATCH_REQUIRED_CHANGED,
g,
didChange);
NS_ENSURE_SUCCESS(rv, rv);
if (didChange) {
NS_ENSURE_TRUE(aChangedNodes->AppendObject(g->mContextNode),
NS_ERROR_FAILURE);
}
}
break;
default:
NS_ERROR("There was no expression which matched\n");
res = PR_FALSE;
break;
}
// Mark successors dirty
nsXFormsMDGNode* sucnode;
for (PRInt32 j = 0; j < g->mSuc.Count(); ++j) {
sucnode = NS_STATIC_CAST(nsXFormsMDGNode*, g->mSuc[j]);
if (!sucnode) {
NS_ERROR("nsXFormsMDGEngine::Calculate(): Node has NULL successor!");
return NS_ERROR_FAILURE;
}
sucnode->MarkDirty();
}
g->MarkClean();
}
nsXFormsUtils::MakeUniqueAndSort(aChangedNodes);
#ifdef DEBUG_XF_MDG
printf("\taChangedNodes: %d\n", aChangedNodes->Count());
printf("\tmNodeToMDG: %d\n", mNodeToMDG.Count());
printf("\tmNodeStates: %d\n", mNodeStates.Count());
printf("\tGraph nodes: %d\n", mGraph.Count());
#endif
return res;
}
nsresult
nsXFormsMDGEngine::Revalidate(nsCOMArray<nsIDOMNode> *aNodes)
{
NS_ENSURE_ARG(aNodes);
NS_ENSURE_STATE(mModel);
for (PRInt32 i = 0; i < aNodes->Count(); ++i) {
nsCOMPtr<nsIDOMNode> node = aNodes->ObjectAt(i);
nsXFormsNodeState* ns = GetNCNodeState(node);
PRBool constraint;
mModel->ValidateNode(node, &constraint);
if (constraint != ns->IsConstraintSchema()) {
ns->Set(eFlag_CONSTRAINT_SCHEMA, constraint);
ns->Set(eFlag_DISPATCH_VALID_CHANGED, PR_TRUE);
}
}
return NS_OK;
}
nsresult
nsXFormsMDGEngine::Rebuild()
{
#ifdef DEBUG_XF_MDG
printf("nsXFormsMDGEngine::Rebuild()\n");
#endif
nsresult rv = NS_OK;
mJustRebuilt = PR_TRUE;
mFirstCalculate = PR_FALSE;
mGraph.Clear();
mNodeStates.Clear();
nsDeque sortedNodes(nsnull);
#ifdef DEBUG_XF_MDG
printf("\tmNodesInGraph: %d\n", mNodesInGraph);
printf("\tmNodeToMDG: %d\n", mNodeToMDG.Count());
printf("\tmNodeStates: %d\n", mNodeStates.Count());
#endif
// Initial scan for nsXFormsMDGNodes with no dependencies (mCount == 0)
PRUint32 entries = mNodeToMDG.EnumerateRead(AddStartNodes, &sortedNodes);
if (entries != mNodeToMDG.Count()) {
return NS_ERROR_OUT_OF_MEMORY;
}
#ifdef DEBUG_XF_MDG
printf("\tStartNodes: %d\n", sortedNodes.GetSize());
#endif
nsXFormsMDGNode* node;
while ((node = NS_STATIC_CAST(nsXFormsMDGNode*, sortedNodes.Pop()))) {
for (PRInt32 i = 0; i < node->mSuc.Count(); ++i) {
nsXFormsMDGNode* sucNode = NS_STATIC_CAST(nsXFormsMDGNode*,
node->mSuc[i]);
NS_ASSERTION(sucNode, "XForms: NULL successor node");
sucNode->mCount--;
if (sucNode->mCount == 0) {
sortedNodes.Push(sucNode);
}
}
node->MarkDirty();
if (!mGraph.AppendElement(node)) {
return NS_ERROR_OUT_OF_MEMORY;
}
}
#ifdef DEBUG_XF_MDG
printf("\tmGraph.Count() = %2d\n", mGraph.Count());
printf("\tmNodesInGraph = %2d\n", mNodesInGraph);
#endif
if (mGraph.Count() != mNodesInGraph) {
nsCOMPtr<nsIDOMElement> modelElement;
if (mModel) {
modelElement = mModel->GetDOMElement();
}
nsXFormsUtils::ReportError(NS_LITERAL_STRING("MDGLoopError"), modelElement);
rv = NS_ERROR_ABORT;
}
mNodesInGraph = 0;
return rv;
}
nsresult
nsXFormsMDGEngine::ClearDispatchFlags()
{
mJustRebuilt = PR_FALSE;
return AndFlags(kFlags_NOT_DISPATCH) ? NS_OK : NS_ERROR_FAILURE;
}
nsresult
nsXFormsMDGEngine::Clear() {
#ifdef DEBUG_XF_MDG
printf("nsXFormsMDGEngine::Clear()\n");
#endif
nsresult rv = mNodeToMDG.Enumerate(DeleteLinkedNodes, nsnull);
NS_ENSURE_SUCCESS(rv, rv);
mNodeToMDG.Clear();
mNodeStates.Clear();
mGraph.Clear();
mNodesInGraph = 0;
return NS_OK;
}
nsresult
nsXFormsMDGEngine::SetNodeValue(nsIDOMNode *aContextNode,
const nsAString &aNodeValue,
PRBool *aNodeChanged)
{
return SetNodeValueInternal(aContextNode,
aNodeValue,
PR_TRUE,
PR_FALSE,
aNodeChanged);
}
nsresult
nsXFormsMDGEngine::SetNodeValueInternal(nsIDOMNode *aContextNode,
const nsAString &aNodeValue,
PRBool aMarkNode,
PRBool aIsCalculate,
PRBool *aNodeChanged)
{
if (aNodeChanged) {
*aNodeChanged = PR_FALSE;
}
const nsXFormsNodeState* ns = GetNodeState(aContextNode);
NS_ENSURE_TRUE(ns, NS_ERROR_FAILURE);
// If the node is read-only and not set by a @calculate MIP,
// ignore the call
if (ns->IsReadonly() && !aIsCalculate) {
///
/// @todo Better feedback for readonly nodes? (XXX)
return NS_OK;
}
nsCOMPtr<nsIDOMNode> childNode;
PRUint16 nodeType;
nsresult rv = aContextNode->GetNodeType(&nodeType);
NS_ENSURE_SUCCESS(rv, rv);
nsAutoString oldValue;
nsXFormsUtils::GetNodeValue(aContextNode, oldValue);
if (oldValue.Equals(aNodeValue)) {
return NS_OK;
}
switch(nodeType) {
case nsIDOMNode::ATTRIBUTE_NODE:
case nsIDOMNode::TEXT_NODE:
case nsIDOMNode::CDATA_SECTION_NODE:
case nsIDOMNode::PROCESSING_INSTRUCTION_NODE:
case nsIDOMNode::COMMENT_NODE:
rv = aContextNode->SetNodeValue(aNodeValue);
NS_ENSURE_SUCCESS(rv, rv);
break;
case nsIDOMNode::ELEMENT_NODE:
rv = aContextNode->GetFirstChild(getter_AddRefs(childNode));
NS_ENSURE_SUCCESS(rv, rv);
if (!childNode) {
rv = CreateNewChild(aContextNode, aNodeValue);
NS_ENSURE_SUCCESS(rv, rv);
} else {
PRUint16 childType;
rv = childNode->GetNodeType(&childType);
NS_ENSURE_SUCCESS(rv, rv);
if (childType == nsIDOMNode::TEXT_NODE ||
childType == nsIDOMNode::CDATA_SECTION_NODE) {
rv = childNode->SetNodeValue(aNodeValue);
NS_ENSURE_SUCCESS(rv, rv);
// Remove all leading text child nodes except first one (see
// nsXFormsUtils::GetNodeValue method for motivation).
nsCOMPtr<nsIDOMNode> siblingNode;
while (true) {
rv = childNode->GetNextSibling(getter_AddRefs(siblingNode));
NS_ENSURE_SUCCESS(rv, rv);
if (!siblingNode)
break;
rv = siblingNode->GetNodeType(&childType);
NS_ENSURE_SUCCESS(rv, rv);
if (childType != nsIDOMNode::TEXT_NODE &&
childType != nsIDOMNode::CDATA_SECTION_NODE) {
break;
}
nsCOMPtr<nsIDOMNode> stubNode;
rv = aContextNode->RemoveChild(siblingNode,
getter_AddRefs(stubNode));
NS_ENSURE_SUCCESS(rv, rv);
}
} else {
// Not a text child, create a new one
rv = CreateNewChild(aContextNode, aNodeValue, childNode);
NS_ENSURE_SUCCESS(rv, rv);
}
}
break;
default:
/// Unsupported nodeType
/// @todo Should return more specific error? (XXX)
return NS_ERROR_ILLEGAL_VALUE;
break;
}
// NB: Never reached for Readonly nodes.
if (aNodeChanged) {
*aNodeChanged = PR_TRUE;
}
if (aMarkNode) {
MarkNodeAsChanged(aContextNode);
}
return NS_OK;
}
nsresult
nsXFormsMDGEngine::SetNodeContent(nsIDOMNode *aContextNode,
nsIDOMNode *aContentEnvelope)
{
NS_ENSURE_ARG(aContextNode);
NS_ENSURE_ARG(aContentEnvelope);
// ok, this is tricky. This function will REPLACE the contents of
// aContextNode with the a clone of the contents of aContentEnvelope. If
// aContentEnvelope has no contents, then any contents that aContextNode
// has will still be removed.
const nsXFormsNodeState* ns = GetNodeState(aContextNode);
NS_ENSURE_TRUE(ns, NS_ERROR_FAILURE);
// If the node is read-only and not set by a @calculate MIP,
// ignore the call
if (ns->IsReadonly()) {
///
/// @todo Better feedback for readonly nodes? (XXX)
return NS_OK;
}
PRUint16 nodeType;
nsresult rv = aContextNode->GetNodeType(&nodeType);
NS_ENSURE_SUCCESS(rv, rv);
if (nodeType != nsIDOMNode::ELEMENT_NODE) {
// got to return something pretty unique that we can check down the road in
// order to dispatch any error events
return NS_ERROR_DOM_WRONG_TYPE_ERR;
}
// Need to determine if the contents of the context node and content envelope
// are already the same. If so, we can avoid some unnecessary work.
PRBool hasChildren1, hasChildren2, contentsEqual = PR_FALSE;
nsresult rv1 = aContextNode->HasChildNodes(&hasChildren1);
nsresult rv2 = aContentEnvelope->HasChildNodes(&hasChildren2);
if (NS_SUCCEEDED(rv1) && NS_SUCCEEDED(rv2) && hasChildren1 == hasChildren2) {
// First test passed. Both have the same number of children nodes.
if (hasChildren1) {
nsCOMPtr<nsIDOMNodeList> children1, children2;
PRUint32 childrenLength1, childrenLength2;
rv1 = aContextNode->GetChildNodes(getter_AddRefs(children1));
rv2 = aContentEnvelope->GetChildNodes(getter_AddRefs(children2));
if (NS_SUCCEEDED(rv1) && NS_SUCCEEDED(rv2) && children1 && children2) {
// Both have child nodes.
rv1 = children1->GetLength(&childrenLength1);
rv2 = children2->GetLength(&childrenLength2);
if (NS_SUCCEEDED(rv1) && NS_SUCCEEDED(rv2) &&
(childrenLength1 == childrenLength2)) {
// both have the same number of child nodes. Now checking to see if
// each of the children are equal.
for (PRUint32 i = 0; i < childrenLength1; ++i) {
nsCOMPtr<nsIDOMNode> child1, child2;
rv1 = children1->Item(i, getter_AddRefs(child1));
rv2 = children2->Item(i, getter_AddRefs(child2));
if (NS_FAILED(rv1) || NS_FAILED(rv2)) {
// Unexpected error. Not as many children in the list as we
// were told.
return NS_ERROR_UNEXPECTED;
}
contentsEqual = nsXFormsUtils::AreNodesEqual(child1, child2, PR_TRUE);
if (!contentsEqual) {
break;
}
}
}
}
} else {
// neither have children
contentsEqual = PR_TRUE;
}
}
if (contentsEqual) {
return NS_OK;
}
// remove any child nodes that aContextNode already contains
nsCOMPtr<nsIDOMNode> resultNode;
nsCOMPtr<nsIDOMNodeList> childList;
rv = aContextNode->GetChildNodes(getter_AddRefs(childList));
NS_ENSURE_SUCCESS(rv, rv);
if (childList) {
PRUint32 length;
rv = childList->GetLength(&length);
NS_ENSURE_SUCCESS(rv, rv);
for (PRInt32 i = length-1; i >= 0; i--) {
nsCOMPtr<nsIDOMNode> childNode;
rv = childList->Item(i, getter_AddRefs(childNode));
NS_ENSURE_SUCCESS(rv, rv);
rv = aContextNode->RemoveChild(childNode, getter_AddRefs(resultNode));
NS_ENSURE_SUCCESS(rv, rv);
}
}
// add contents of the envelope under aContextNode
nsCOMPtr<nsIDOMNode> childNode;
rv = aContentEnvelope->GetFirstChild(getter_AddRefs(childNode));
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIDOMDocument> document;
rv = aContextNode->GetOwnerDocument(getter_AddRefs(document));
NS_ENSURE_STATE(document);
while (childNode) {
nsCOMPtr<nsIDOMNode> importedNode;
rv = document->ImportNode(childNode, PR_TRUE, getter_AddRefs(importedNode));
NS_ENSURE_STATE(importedNode);
rv = aContextNode->AppendChild(importedNode, getter_AddRefs(resultNode));
NS_ENSURE_SUCCESS(rv, rv);
rv = childNode->GetNextSibling(getter_AddRefs(resultNode));
NS_ENSURE_SUCCESS(rv, rv);
resultNode.swap(childNode);
}
// We already know that the contents have changed. Mark the node so that
// a xforms-value-changed can be dispatched.
MarkNodeAsChanged(aContextNode);
return NS_OK;
}
const nsXFormsNodeState*
nsXFormsMDGEngine::GetNodeState(nsIDOMNode *aContextNode)
{
return GetNCNodeState(aContextNode);
}
/**********************************************/
/* Private functions */
/**********************************************/
nsXFormsNodeState*
nsXFormsMDGEngine::GetNCNodeState(nsIDOMNode *aContextNode)
{
nsXFormsNodeState* ns = nsnull;
if (aContextNode && !mNodeStates.Get(aContextNode, &ns)) {
ns = new nsXFormsNodeState(kFlags_DEFAULT |
((mJustRebuilt && mFirstCalculate) ? kFlags_INITIAL_DISPATCH : 0));
NS_ASSERTION(ns, "Could not create new nsXFormsNodeState");
if (!mNodeStates.Put(aContextNode, ns)) {
NS_ERROR("Could not insert new nsXFormsNodeState");
delete ns;
return nsnull;
}
aContextNode->AddRef();
// Do an initial type check, and set the validity state
PRBool constraint;
mModel->ValidateNode(aContextNode, &constraint);
ns->Set(eFlag_CONSTRAINT_SCHEMA, constraint);
}
return ns;
}
nsresult
nsXFormsMDGEngine::CreateNewChild(nsIDOMNode *aContextNode,
const nsAString &aNodeValue,
nsIDOMNode *aBeforeNode)
{
nsresult rv;
nsCOMPtr<nsIDOMDocument> document;
rv = aContextNode->GetOwnerDocument(getter_AddRefs(document));
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIDOMText> textNode;
rv = document->CreateTextNode(aNodeValue, getter_AddRefs(textNode));
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIDOMNode> newNode;
if (aBeforeNode) {
rv = aContextNode->InsertBefore(textNode,
aBeforeNode,
getter_AddRefs(newNode));
} else {
rv = aContextNode->AppendChild(textNode,
getter_AddRefs(newNode));
}
return rv;
}
PLDHashOperator
nsXFormsMDGEngine::DeleteLinkedNodes(nsISupports *aKey,
nsAutoPtr<nsXFormsMDGNode> &aNode,
void *aArg)
{
if (!aNode) {
NS_WARNING("nsXFormsMDGEngine::DeleteLinkedNodes() called with aNode == nsnull!");
return PL_DHASH_STOP;
}
nsXFormsMDGNode* temp;
nsXFormsMDGNode* next = aNode->mNext;
while (next) {
temp = next;
next = next->mNext;
delete temp;
}
return PL_DHASH_NEXT;
}
nsXFormsMDGNode*
nsXFormsMDGEngine::GetNode(nsIDOMNode *aDomNode,
ModelItemPropName aType,
PRBool aCreate)
{
nsIDOMNode* nodeKey = aDomNode;
nsXFormsMDGNode* nd = nsnull;
#ifdef DEBUG_XF_MDG
printf("nsXFormsMDGEngine::GetNode(aDomNode=%p, aType=%s, aCreate=%d)\n",
(void*) nodeKey, gMIPNames[aType], aCreate);
#endif
// Find correct type
if (mNodeToMDG.Get(nodeKey, &nd) && aType != eModel_type) {
while (nd && aType != nd->mType) {
nd = nd->mNext;
}
}
// Eventually create node
if (!nd && aCreate){
nd = new nsXFormsMDGNode(nodeKey, aType);
if (!nd) {
NS_ERROR("Could not allocate room for new nsXFormsMDGNode");
return nsnull;
}
#ifdef DEBUG_XF_MDG
printf("\tNode not found, create new MDGNode '%p'\n", (void*) nd);
#endif
// Link to existing node
nsXFormsMDGNode* nd_exists;
if (mNodeToMDG.Get(nodeKey, &nd_exists)) {
while (nd_exists->mNext) {
nd_exists = nd_exists->mNext;
}
#ifdef DEBUG_XF_MDG
printf("\tLinking to existing MDGNode '%p'\n", (void*) nd_exists);
#endif
nd_exists->mNext = nd;
} else {
if (!mNodeToMDG.Put(nodeKey, nd)) {
delete nd;
NS_ERROR("Could not insert new node in HashTable!");
return nsnull;
}
nodeKey->AddRef();
}
mNodesInGraph++;
}
return nd;
}
PLDHashOperator
nsXFormsMDGEngine::AddStartNodes(nsISupports *aKey,
nsXFormsMDGNode *aNode,
void *aDeque)
{
#ifdef DEBUG_XF_MDG
printf("nsXFormsMDGEngine::AddStartNodes(aKey=n/a, aNode=%p, aDeque=%p)\n",
(void*) aNode,
aDeque);
#endif
nsDeque* deque = NS_STATIC_CAST(nsDeque*, aDeque);
if (!deque) {
NS_ERROR("nsXFormsMDGEngine::AddStartNodes called with NULL aDeque");
return PL_DHASH_STOP;
}
while (aNode) {
if (aNode->mCount == 0) {
///
/// @todo Is it not possible to check error condition? (XXX)
deque->Push(aNode);
}
aNode = aNode->mNext;
}
return PL_DHASH_NEXT;
}
PLDHashOperator
nsXFormsMDGEngine::AndFlag(nsISupports *aKey,
nsAutoPtr<nsXFormsNodeState> &aState,
void *aMask)
{
PRUint16* andMask = NS_STATIC_CAST(PRUint16*, aMask);
if (!andMask) {
return PL_DHASH_STOP;
}
*aState &= *andMask;
return PL_DHASH_NEXT;
}
PRBool
nsXFormsMDGEngine::AndFlags(PRUint16 aAndMask)
{
PRUint32 entries = mNodeStates.Enumerate(AndFlag, &aAndMask);
return (entries == mNodeStates.Count()) ? PR_TRUE : PR_FALSE;
}
nsresult
nsXFormsMDGEngine::BooleanExpression(nsXFormsMDGNode* aNode, PRBool& state)
{
NS_ENSURE_ARG_POINTER(aNode);
NS_ENSURE_TRUE(aNode->mExpression, NS_ERROR_FAILURE);
nsCOMPtr<nsISupports> retval;
nsresult rv;
rv = aNode->mExpression->EvaluateWithContext(aNode->mContextNode,
aNode->mContextPosition,
aNode->mContextSize,
nsIDOMXPathResult::BOOLEAN_TYPE,
nsnull,
getter_AddRefs(retval));
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIDOMXPathResult> xpath_res = do_QueryInterface(retval);
NS_ENSURE_TRUE(xpath_res, NS_ERROR_FAILURE);
rv = xpath_res->GetBooleanValue(&state);
return rv;
}
nsresult
nsXFormsMDGEngine::ComputeMIP(eFlag_t aStateFlag,
eFlag_t aDispatchFlag,
nsXFormsMDGNode *aNode,
PRBool &aDidChange)
{
NS_ENSURE_ARG(aNode);
aDidChange = PR_FALSE;
if (!aNode->mExpression)
return NS_OK;
nsXFormsNodeState* ns = GetNCNodeState(aNode->mContextNode);
NS_ENSURE_TRUE(ns, NS_ERROR_FAILURE);
PRBool state;
nsresult rv = BooleanExpression(aNode, state);
NS_ENSURE_SUCCESS(rv, rv);
PRBool cstate = ns->Test(aStateFlag);
ns->Set(aStateFlag, state);
aDidChange = (state != cstate) ? PR_TRUE : PR_FALSE;
if (aDidChange) {
ns->Set(aDispatchFlag, PR_TRUE);
}
return NS_OK;
}
nsresult
nsXFormsMDGEngine::ComputeMIPWithInheritance(eFlag_t aStateFlag,
eFlag_t aDispatchFlag,
eFlag_t aInheritanceFlag,
nsXFormsMDGNode *aNode,
nsCOMArray<nsIDOMNode> *aSet)
{
nsresult rv;
PRBool didChange;
rv = ComputeMIP(aStateFlag, aDispatchFlag, aNode, didChange);
NS_ENSURE_SUCCESS(rv, rv);
if (didChange) {
nsXFormsNodeState* ns = GetNCNodeState(aNode->mContextNode);
NS_ENSURE_TRUE(ns, NS_ERROR_FAILURE);
if ( !(aStateFlag == eFlag_READONLY && ns->Test(aInheritanceFlag))
|| (aStateFlag == eFlag_RELEVANT && ns->Test(aInheritanceFlag)) )
{
NS_ENSURE_TRUE(aSet->AppendObject(aNode->mContextNode),
NS_ERROR_FAILURE);
rv = AttachInheritance(aSet,
aNode->mContextNode,
ns->Test(aStateFlag),
aStateFlag);
}
}
return rv;
}
nsresult
nsXFormsMDGEngine::AttachInheritance(nsCOMArray<nsIDOMNode> *aSet,
nsIDOMNode *aSrc,
PRBool aState,
eFlag_t aStateFlag)
{
NS_ENSURE_ARG(aSrc);
nsCOMPtr<nsIDOMNode> node;
nsresult rv;
PRBool updateNode = PR_FALSE;
nsCOMPtr<nsIDOMNodeList> childList;
rv = aSrc->GetChildNodes(getter_AddRefs(childList));
NS_ENSURE_SUCCESS(rv, rv);
PRUint32 childCount;
rv = childList->GetLength(&childCount);
NS_ENSURE_SUCCESS(rv, rv);
for (PRUint32 i = 0; i < childCount; i++) {
rv = childList->Item(i, getter_AddRefs(node));
NS_ENSURE_SUCCESS(rv, rv);
NS_ENSURE_TRUE(node, NS_ERROR_FAILURE);
nsXFormsNodeState *ns = GetNCNodeState(node);
NS_ENSURE_TRUE(ns, NS_ERROR_FAILURE);
PRBool curState = ns->Test(aStateFlag);
if (aStateFlag == eFlag_RELEVANT) {
if (!aState) { // The nodes are getting irrelevant
if (ns->Test(eFlag_INHERITED_RELEVANT) && curState) {
ns->Set(eFlag_INHERITED_RELEVANT, PR_FALSE);
ns->Set(eFlag_DISPATCH_RELEVANT_CHANGED, PR_TRUE);
updateNode = PR_TRUE;
}
} else { // The nodes are becoming relevant
if (curState) {
// Relevant has changed from inheritance
ns->Set(eFlag_DISPATCH_RELEVANT_CHANGED, PR_TRUE);
ns->Set(eFlag_INHERITED_RELEVANT, PR_TRUE);
updateNode = PR_TRUE;
}
}
} else if (aStateFlag == eFlag_READONLY) {
if (aState) { // The nodes are getting readonly
if (!ns->Test(eFlag_INHERITED_READONLY) && curState == PR_FALSE) {
ns->Set(eFlag_INHERITED_READONLY | eFlag_DISPATCH_READONLY_CHANGED,
PR_TRUE);
updateNode = PR_TRUE;
}
} else { // The nodes are getting readwrite
if (curState) {
ns->Set(eFlag_DISPATCH_READONLY_CHANGED, PR_TRUE);
ns->Set(eFlag_INHERITED_READONLY, PR_FALSE);
updateNode = PR_TRUE;
}
}
}
if (updateNode) {
rv = AttachInheritance(aSet, node, aState, aStateFlag);
NS_ENSURE_SUCCESS(rv, rv);
NS_ENSURE_TRUE(aSet->AppendObject(node), NS_ERROR_FAILURE);
updateNode = PR_FALSE;
}
}
return NS_OK;
}
nsresult
nsXFormsMDGEngine::Invalidate()
{
nsXFormsMDGNode* g;
for (PRInt32 i = 0; i < mGraph.Count(); ++i) {
g = NS_STATIC_CAST(nsXFormsMDGNode*, mGraph[i]);
NS_ENSURE_TRUE(g, NS_ERROR_FAILURE);
g->MarkDirty();
}
return NS_OK;
}
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