/// <inheritdoc/>
internal override bool UpdateDataFrom(AXmlObject source)
{
if (!base.UpdateDataFrom(source)) return false;
AXmlText src = (AXmlText)source;
if (this.EscapedValue != src.EscapedValue ||
this.Value != src.Value)
{
OnChanging();
this.EscapedValue = src.EscapedValue;
this.Value = src.Value;
OnChanged();
return true;
} else {
return false;
}
}
/// <inheritdoc/>
internal override bool UpdateDataFrom(AXmlObject source)
{
if (!base.UpdateDataFrom(source)) return false;
AXmlElement src = (AXmlElement)source;
// Clear the cache for this - quite expensive
attributesAndElements = null;
if (this.IsProperlyNested != src.IsProperlyNested ||
this.HasStartOrEmptyTag != src.HasStartOrEmptyTag ||
this.HasEndTag != src.HasEndTag)
{
OnChanging();
this.IsProperlyNested = src.IsProperlyNested;
this.HasStartOrEmptyTag = src.HasStartOrEmptyTag;
this.HasEndTag = src.HasEndTag;
OnChanged();
return true;
} else {
return false;
}
}
/// <summary>
/// To be used exclusively by the children update algorithm.
/// Insert child and keep links consistent.
/// </summary>
void InsertChild(int index, AXmlObject item)
{
AXmlParser.Log("Inserting {0} at index {1}", item, index);
Assert(this.Document != null, "Can not insert to dangling object");
Assert(item.Parent != this, "Can not own item twice");
SetParentPointersInTree(item);
this.Children.InsertItemAt(index, item);
this.Document.OnObjectInserted(index, item);
}
/// <summary> Recursively fix all parent pointer in a tree </summary>
/// <remarks>
/// Cache constraint:
/// If cached item has parent set, then the whole subtree must be consistent and document set
/// </remarks>
void SetParentPointersInTree(AXmlObject item)
{
// All items come from the parser cache
if (item.Parent == null) {
// Dangling object - either a new parser object or removed tree (still cached)
item.Parent = this;
item.Document = this.Document;
AXmlContainer container = item as AXmlContainer;
if (container != null) {
foreach(AXmlObject child in container.Children) {
container.SetParentPointersInTree(child);
}
}
} else if (item.Parent == this) {
// If node is attached and then deattached, it will have null parent pointer
// but valid subtree - so its children will alredy have correct parent pointer
// like in this case
// item.DebugCheckConsistency(false);
// Rest of the tree is consistent - do not recurse
} else {
// From cache & parent set => consitent subtree
// item.DebugCheckConsistency(false);
// The parent (or any futher parents) can not be part of parsed document
// becuase otherwise this item would be included twice => safe to change parents
// Maintain cache constraint by setting parents to null
foreach(AXmlObject ancest in item.GetAncestors().ToList()) {
ancest.Parent = null;
}
item.Parent = this;
// Rest of the tree is consistent - do not recurse
}
}
/// <inheritdoc/>
internal override bool UpdateDataFrom(AXmlObject source)
{
if (!base.UpdateDataFrom(source)) return false;
AXmlAttribute src = (AXmlAttribute)source;
if (this.Name != src.Name ||
this.EqualsSign != src.EqualsSign ||
this.QuotedValue != src.QuotedValue ||
this.Value != src.Value)
{
OnChanging();
this.Name = src.Name;
this.EqualsSign = src.EqualsSign;
this.QuotedValue = src.QuotedValue;
this.Value = src.Value;
OnChanged();
return true;
} else {
return false;
}
}
// Only these four methods should be used to modify the collection
/// <summary> To be used exlucively by the parser </summary>
internal void AddChild(AXmlObject item)
{
// Childs can be only added to newly parsed items
Assert(this.Parent == null, "I have to be new");
Assert(item.IsCached, "Added item must be in cache");
// Do not set parent pointer
this.Children.InsertItemAt(this.Children.Count, item);
}
/// <inheritdoc/>
internal override bool UpdateDataFrom(AXmlObject source)
{
if (!base.UpdateDataFrom(source)) return false;
AXmlTag src = (AXmlTag)source;
if (this.OpeningBracket != src.OpeningBracket ||
this.Name != src.Name ||
this.ClosingBracket != src.ClosingBracket)
{
OnChanging();
this.OpeningBracket = src.OpeningBracket;
this.Name = src.Name;
this.ClosingBracket = src.ClosingBracket;
OnChanged();
return true;
} else {
return false;
}
}
internal void OnObjectRemoved(int index, AXmlObject obj)
{
if (ObjectRemoved != null)
ObjectRemoved(this, new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Remove, new AXmlObject[] { obj }.ToList(), index));
}
internal void OnObjectChanging(AXmlObject obj)
{
if (ObjectChanging != null)
ObjectChanging(this, new AXmlObjectEventArgs() { Object = obj } );
}
/// <summary> Copy all data from the 'source' to this object </summary>
/// <remarks> Returns true if any updates were done </remarks>
internal virtual bool UpdateDataFrom(AXmlObject source)
{
Assert(this.GetType() == source.GetType(), "Source has different type");
DebugAssert(this.StartOffset == source.StartOffset, "Source has different StartOffset");
if (this.LastUpdatedFrom == source) {
DebugAssert(this.EndOffset == source.EndOffset, "Source has different EndOffset");
return false;
}
Assert(!this.IsCached, "Can not update cached item");
Assert(source.IsCached, "Must update from cache");
this.LastUpdatedFrom = source;
this.StartOffset = source.StartOffset;
// In some cases we are just updating objects of that same
// type and position and hoping to be luckily right
this.EndOffset = source.EndOffset;
// Do not bother comparing - assume changed if non-null
if (this.syntaxErrors != null || source.syntaxErrors != null) {
// May be called again in derived class - oh, well, does not matter
OnChanging();
this.Document.Parser.TrackedSegments.RemoveSyntaxErrorsOf(this);
if (source.syntaxErrors == null) {
this.syntaxErrors = null;
} else {
this.syntaxErrors = new List<SyntaxError>();
foreach(var error in source.MySyntaxErrors) {
// The object differs, so create our own copy
// The source still might need it in the future and we do not want to break it
this.AddSyntaxError(error.Clone(this));
}
}
this.Document.Parser.TrackedSegments.AddSyntaxErrorsOf(this);
OnChanged();
}
return true;
}
/// <summary> Is call to UpdateDataFrom is allowed? </summary>
internal bool CanUpdateDataFrom(AXmlObject source)
{
return
this.GetType() == source.GetType() &&
this.StartOffset == source.StartOffset &&
(this.LastUpdatedFrom == source || !this.IsCached);
}
