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using System.IO;
using System.Text;
using System.Xml.Schema;
using System.Xml.XPath;
using System.Diagnostics;
using System.Globalization;
using System.Collections;
using System.Security.Policy;
using System.Threading.Tasks;
namespace System.Xml {
internal partial class XsdCachingReader : XmlReader, IXmlLineInfo {
// Gets the text value of the current node.
public override Task<string> GetValueAsync() {
if (returnOriginalStringValues) {
return Task.FromResult(cachedNode.OriginalStringValue);
}
else {
return Task.FromResult(cachedNode.RawValue);
}
}
// Reads the next node from the stream/TextReader.
public override async Task< bool > ReadAsync() {
switch (cacheState) {
case CachingReaderState.Init:
cacheState = CachingReaderState.Record;
goto case CachingReaderState.Record;
case CachingReaderState.Record:
ValidatingReaderNodeData recordedNode = null;
if (await coreReader.ReadAsync().ConfigureAwait(false)) {
switch(coreReader.NodeType) {
case XmlNodeType.Element:
//Dont record element within the content of a union type since the main reader will break on this and the underlying coreReader will be positioned on this node
cacheState = CachingReaderState.ReaderClosed;
return false;
case XmlNodeType.EndElement:
recordedNode = AddContent(coreReader.NodeType);
recordedNode.SetItemData(coreReader.LocalName, coreReader.Prefix, coreReader.NamespaceURI, coreReader.Depth); //Only created for element node type
recordedNode.SetLineInfo(lineInfo);
break;
case XmlNodeType.Comment:
case XmlNodeType.ProcessingInstruction:
case XmlNodeType.Text:
case XmlNodeType.CDATA:
case XmlNodeType.Whitespace:
case XmlNodeType.SignificantWhitespace:
recordedNode = AddContent(coreReader.NodeType);
recordedNode.SetItemData(await coreReader.GetValueAsync().ConfigureAwait(false));
recordedNode.SetLineInfo(lineInfo);
recordedNode.Depth = coreReader.Depth;
break;
default:
break;
}
cachedNode = recordedNode;
return true;
}
else {
cacheState = CachingReaderState.ReaderClosed;
return false;
}
case CachingReaderState.Replay:
if (currentContentIndex >= contentIndex) { //When positioned on the last cached node, switch back as the underlying coreReader is still positioned on this node
cacheState = CachingReaderState.ReaderClosed;
cacheHandler(this);
if (coreReader.NodeType != XmlNodeType.Element || readAhead) { //Only when coreReader not positioned on Element node, read ahead, otherwise it is on the next element node already, since this was not cached
return await coreReader.ReadAsync().ConfigureAwait(false);
}
return true;
}
cachedNode = contentEvents[currentContentIndex];
if (currentContentIndex > 0) {
ClearAttributesInfo();
}
currentContentIndex++;
return true;
default:
return false;
}
}
// Skips to the end tag of the current element.
public override async Task SkipAsync() {
//Skip on caching reader should move to the end of the subtree, past all cached events
switch (cachedNode.NodeType) {
case XmlNodeType.Element:
if (coreReader.NodeType != XmlNodeType.EndElement && !readAhead) { //will be true for IsDefault cases where we peek only one node ahead
int startDepth = coreReader.Depth - 1;
while (await coreReader.ReadAsync().ConfigureAwait(false) && coreReader.Depth > startDepth)
;
}
await coreReader.ReadAsync().ConfigureAwait(false);
cacheState = CachingReaderState.ReaderClosed;
cacheHandler(this);
break;
case XmlNodeType.Attribute:
MoveToElement();
goto case XmlNodeType.Element;
default:
Debug.Assert(cacheState == CachingReaderState.Replay);
await ReadAsync().ConfigureAwait(false);
break;
}
}
//Private methods
internal Task SetToReplayModeAsync() {
cacheState = CachingReaderState.Replay;
currentContentIndex = 0;
currentAttrIndex = -1;
return ReadAsync(); //Position on first node recorded to begin replaying
}
}
}
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