public static SyntaxTree GetSyntaxTree(this ITextSnapshot snapshot)
{
ITextBuffer buffer = snapshot.TextBuffer;
SyntaxTree syntaxTree = null;
// try get syntax tree
lock (buffer.Properties.GetOrCreateSingletonProperty("SyntaxLock", () => new object()))
{
buffer.Properties.TryGetProperty <SyntaxTree>(typeof(SyntaxTree), out syntaxTree);
// not found, or not for current snapshot
if (syntaxTree == null ||
syntaxTree.Snapshot != snapshot)
{
// parse
ISyntacticParser lexicalParser = null;
if (buffer.Properties.TryGetProperty <ISyntacticParser>(typeof(ISyntacticParser), out lexicalParser))
{
syntaxTree = lexicalParser.Parse(snapshot);
// overwrite syntax tree for current snapshot
if (snapshot == buffer.CurrentSnapshot)
{
buffer.Properties.RemoveProperty(typeof(SyntaxTree));
buffer.Properties.AddProperty(typeof(SyntaxTree), syntaxTree);
}
}
}
}
return(syntaxTree);
}
/// <summary>
/// Initializes a new instance of the <see cref="RobotsTxtClassifier"/> class.
/// </summary>
/// <param name="registry">Classification registry.</param>
public RobotsTxtClassifier(ITextBuffer buffer, ISyntacticParser syntacticParser, IClassificationTypeRegistryService registry)
{
buffer.Properties.AddProperty(typeof(ISyntacticParser), syntacticParser);
_commentType = registry.GetClassificationType(PredefinedClassificationTypeNames.Comment);
_delimiterType = registry.GetClassificationType("RobotsTxt/Delimiter");
_propertyNameType = registry.GetClassificationType("RobotsTxt/PropertyName");
_propertyValueType = registry.GetClassificationType("RobotsTxt/PropertyValue");
}
/// <summary>
/// Initializes a new instance of the <see cref="RobotsTxtClassifier"/> class.
/// </summary>
/// <param name="registry">Classification registry.</param>
public RobotsTxtClassifier(ITextBuffer buffer, ISyntacticParser syntacticParser, IClassificationTypeRegistryService registry)
{
buffer.Properties.AddProperty(typeof(ISyntacticParser), syntacticParser);
_commentType = registry.GetClassificationType(PredefinedClassificationTypeNames.Comment);
_delimiterType = registry.GetClassificationType("RobotsTxt/Delimiter");
_propertyNameType = registry.GetClassificationType("RobotsTxt/PropertyName");
_propertyValueType = registry.GetClassificationType("RobotsTxt/PropertyValue");
}
/// <summary>
/// Registrytializes a new instance of the <see cref="RegistryClassifier"/> class.
/// </summary>
/// <param name="registry">Classification registry.</param>
public RegistryClassifier(ITextBuffer buffer, ISyntacticParser syntacticParser, IClassificationTypeRegistryService registry)
{
buffer.Properties.AddProperty(typeof(ISyntacticParser), syntacticParser);
}
