internal static StringRebuilder StringRebuilderFromSnapshotSpan(SnapshotSpan span)
{
TextSnapshot snapshot = span.Snapshot as TextSnapshot;
if (snapshot != null)
{
return(snapshot.Content.Substring(span));
}
IProjectionSnapshot projectionSnapshot = span.Snapshot as IProjectionSnapshot;
if (projectionSnapshot != null)
{
StringRebuilder content = SimpleStringRebuilder.Create(string.Empty);
foreach (var childSpan in projectionSnapshot.MapToSourceSnapshots(span))
{
content = content.Append(StringRebuilderFromSnapshotSpan(childSpan));
}
return(content);
}
//The we don't know what to do fallback. This should never be called unless someone provides a new snapshot
//implementation.
return(SimpleStringRebuilder.Create(span.GetText()));
}
public ITextBuffer CreateTextBuffer(IContentType contentType)
{
if (contentType == null)
{
throw new ArgumentNullException("contentType");
}
return(Make(contentType, SimpleStringRebuilder.Create(String.Empty), false));
}
public ITextBuffer CreateTextBuffer(string text, IContentType contentType, bool spurnGroup)
{
if (text == null)
{
throw new ArgumentNullException("text");
}
if (contentType == null)
{
throw new ArgumentNullException("contentType");
}
return(Make(contentType, SimpleStringRebuilder.Create(text), spurnGroup));
}
private static StringRebuilder ConsolidateOrBalanceTreeNode(StringRebuilder left, StringRebuilder right)
{
if ((left.Length + right.Length < TextModelOptions.StringRebuilderMaxCharactersToConsolidate) &&
(left.LineBreakCount + right.LineBreakCount <= TextModelOptions.StringRebuilderMaxLinesToConsolidate))
{
//Consolidate the two rebuilders into a single simple string rebuilder
return(SimpleStringRebuilder.Create(left, right));
}
else
{
return(BinaryStringRebuilder.BalanceTreeNode(left, right));
}
}
/// <summary>
/// Construct a new SimpleStringRebuilder that is a substring of another string rebuilder.
/// </summary>
private static SimpleStringRebuilder CreateSubstring(Span span, SimpleStringRebuilder simpleSource)
{
int firstLineNumber = simpleSource.GetLineNumberFromPosition(span.Start) + simpleSource._lineBreakSpanStart;
int lastLineNumber = simpleSource.GetLineNumberFromPosition(span.End) + simpleSource._lineBreakSpanStart;
//Handle the special case where the end position falls in the middle of a linebreak.
if ((lastLineNumber < simpleSource.LineBreakSpanEnd) &&
(span.End > simpleSource._storage.LineBreaks.StartOfLineBreak(lastLineNumber) - simpleSource._textSpanStart))
{
++lastLineNumber;
}
return(new SimpleStringRebuilder(simpleSource._storage, span.Start + simpleSource._textSpanStart, span.Length, firstLineNumber, lastLineNumber - firstLineNumber));
}
public override StringRebuilder Substring(Span span)
{
if (span.End > this.Length)
{
throw new ArgumentOutOfRangeException("span");
}
if (span.Length == this.Length)
{
return(this);
}
else if (span.Length == 0)
{
return(_empty);
}
else
{
return(SimpleStringRebuilder.CreateSubstring(span, this));
}
}
public static ChangeString CreateChangeString(IList <SnapshotSpan> sourceSpans, Span selected)
{
if (selected.Length == 0)
{
return(ChangeString.EmptyChangeString);
}
else if (selected.Length == 1)
{
return(ReferenceChangeString.CreateChangeString(sourceSpans[selected.Start]));
}
else
{
StringRebuilder builder = SimpleStringRebuilder.Create(String.Empty);
for (int i = 0; (i < selected.Length); ++i)
{
builder = builder.Insert(builder.Length, BufferFactoryService.StringRebuilderFromSnapshotSpan(sourceSpans[selected.Start + i]));
}
return(ReferenceChangeString.CreateChangeString(builder));
}
}
public ITextBuffer CreateTextBuffer(TextReader reader, IContentType contentType, long length, string traceId)
{
if (reader == null)
{
throw new ArgumentNullException("reader");
}
if (contentType == null)
{
throw new ArgumentNullException("contentType");
}
if (length > int.MaxValue)
{
throw new InvalidOperationException(Strings.FileTooLarge);
}
ITextStorageLoader loader;
if (length < TextModelOptions.CompressedStorageFileSizeThreshold)
{
loader = new SimpleTextStorageLoader(reader, (int)length);
}
else
{
loader = new CompressedTextStorageLoader(reader, (int)length, traceId);
}
StringRebuilder content = SimpleStringRebuilder.Create(loader);
ITextBuffer buffer = Make(contentType, content, false);
if (!loader.HasConsistentLineEndings)
{
// leave a sign that line endings are inconsistent. This is rather nasty but for now
// we don't want to pollute the API with this factoid
buffer.Properties.AddProperty("InconsistentLineEndings", true);
}
// leave a similar sign about the longest line in the buffer.
buffer.Properties.AddProperty("LongestLineLength", loader.LongestLineLength);
return(buffer);
}
public static StringRebuilder Create(StringRebuilder left, StringRebuilder right)
{
if (left == null)
{
throw new ArgumentNullException("left");
}
if (right == null)
{
throw new ArgumentNullException("right");
}
if (left.Length == 0)
{
return(right);
}
else if (right.Length == 0)
{
return(left);
}
else if ((left.Length + right.Length < TextModelOptions.StringRebuilderMaxCharactersToConsolidate) &&
(left.LineBreakCount + right.LineBreakCount <= TextModelOptions.StringRebuilderMaxLinesToConsolidate))
{
//Consolidate the two rebuilders into a single simple string rebuilder
return(SimpleStringRebuilder.Create(left, right));
}
else if (right.StartsWithNewLine && left.EndsWithReturn)
{
//Don't allow a line break to be broken across the seam
return(BinaryStringRebuilder.Create(BinaryStringRebuilder.Create(left.Substring(new Span(0, left.Length - 1)),
_crlf),
right.Substring(Span.FromBounds(1, right.Length))));
}
else
{
return(BinaryStringRebuilder.BalanceStringRebuilder(left, right));
}
}
public ITextBuffer CreateTextBuffer()
{
return(Make(TextContentType, SimpleStringRebuilder.Create(String.Empty), false));
}
public ReloadResult Reload(EditOptions options)
{
if (_isDisposed)
{
throw new ObjectDisposedException("ITextDocument");
}
if (_raisingDirtyStateChangedEvent || _raisingFileActionChangedEvent)
{
throw new InvalidOperationException();
}
var beforeSnapshot = _textBuffer.CurrentSnapshot;
Encoding newEncoding = null;
FallbackDetector fallbackDetector;
try
{
_reloadingFile = true;
// Load the file and read the contents to the text buffer
long fileSize;
using (var stream = TextDocumentFactoryService.OpenFileGuts(_filePath, out _lastModifiedTimeUtc, out fileSize))
{
// We want to use the encoding indicated by a BoM if one is present because
// VS9's editor did so. We can't let the StreamReader below detect
// the byte order marks because we still want to be able to detect the
// fallback condition.
bool unused;
newEncoding = EncodedStreamReader.CheckForBoM(stream, isStreamEmpty: out unused);
Debug.Assert(newEncoding == null || newEncoding.GetPreamble().Length > 0);
// TODO: Consider using the encoder detector extensions as well.
if (newEncoding == null)
{
newEncoding = this.Encoding;
}
fallbackDetector = new FallbackDetector(newEncoding.DecoderFallback);
var modifiedEncoding = (Encoding)newEncoding.Clone();
modifiedEncoding.DecoderFallback = fallbackDetector;
using (var streamReader = new StreamReader(stream, modifiedEncoding, detectEncodingFromByteOrderMarks: false))
{
TextBuffer concreteBuffer = _textBuffer as TextBuffer;
if (concreteBuffer != null)
{
ITextStorageLoader loader;
if (fileSize < TextModelOptions.CompressedStorageFileSizeThreshold)
{
loader = new SimpleTextStorageLoader(streamReader, (int)fileSize);
}
else
{
loader = new CompressedTextStorageLoader(streamReader, (int)fileSize, _filePath);
}
StringRebuilder newContent = SimpleStringRebuilder.Create(loader);
if (!loader.HasConsistentLineEndings)
{
// leave a sign that line endings are inconsistent. This is rather nasty but for now
// we don't want to pollute the API with this factoid.
concreteBuffer.Properties["InconsistentLineEndings"] = true;
}
else
{
// this covers a really obscure case where on initial load the file had inconsistent line
// endings, but the UI settings were such that it was ignored, and since then the file has
// acquired consistent line endings and the UI settings have also changed.
concreteBuffer.Properties.RemoveProperty("InconsistentLineEndings");
}
// leave a similar sign about the longest line in the buffer.
concreteBuffer.Properties["LongestLineLength"] = loader.LongestLineLength;
concreteBuffer.ReloadContent(newContent, options, editTag: this);
}
else
{
// we may hit this path if somebody mocks the text buffer in a test.
using (var edit = _textBuffer.CreateEdit(options, null, editTag: this))
{
if (edit.Replace(new Span(0, edit.Snapshot.Length), streamReader.ReadToEnd()))
{
edit.Apply();
}
else
{
edit.Cancel();
}
}
}
Debug.Assert(streamReader.CurrentEncoding.CodePage == newEncoding.CodePage);
Debug.Assert(streamReader.CurrentEncoding.GetPreamble().Length == newEncoding.GetPreamble().Length);
}
}
}
finally
{
_reloadingFile = false;
}
//The snapshot on a reload will change even if the contents of the before & after files are identical (differences will simply find an
//empty set of changes) so this test is a measure of whether of not the reload succeeded.
if (beforeSnapshot.Version.Next != null)
{
// Update status
// set the "clean" reiterated version number to the reiterated version number of the version immediately
// after the before snapshot (which is the state of the buffer after loading the document but before any
// subsequent edits made in the text buffer changed events).
_cleanReiteratedVersion = beforeSnapshot.Version.Next.ReiteratedVersionNumber;
// TODO: the following event really should be queued up through the buffer group so that it comes before
// the text changed event (and any subsequent text changed event invoked from an event handler)
RaiseFileActionChangedEvent(_lastModifiedTimeUtc, FileActionTypes.ContentLoadedFromDisk, _filePath);
this.Encoding = newEncoding;
return(fallbackDetector.FallbackOccurred ? ReloadResult.SucceededWithCharacterSubstitutions : ReloadResult.Succeeded);
}
else
{
return(ReloadResult.Aborted);
}
}
/// <summary>
/// Create a new StringRebuilder equivalent to replacing a contiguous span of characters
/// with different text.
/// </summary>
/// <param name="span">
/// Span of text in this <see cref="StringRebuilder"/> to replace.
/// </param>
/// <param name="text">
/// The new text to replace the old.
/// </param>
/// <returns>
/// A new string rebuilder containing the replacement.
/// </returns>
/// <remarks>
/// <para>this <see cref="StringRebuilder"/> is not modified.</para>
/// <para>This operation can be performed simultaneously on multiple threads.</para>
/// </remarks>
/// <exception cref="ArgumentOutOfRangeException"><paramref name="span"/>.End is greater than <see cref="Length"/>.</exception>
/// <exception cref="ArgumentNullException"><paramref name="text"/> is null.</exception>
public StringRebuilder Replace(Span span, string text)
{
return(this.Replace(span, SimpleStringRebuilder.Create(text)));
}
/// <summary>
/// Create a new StringRebuilder equivalent to inserting storage into this <see cref="StringRebuilder"/>.
/// </summary>
/// <param name="position">Position at which to insert.</param>
/// <param name="storage">Storage containing text to insert.</param>
/// <returns>A new StringRebuilder containing the insertion.</returns>
/// <remarks>
/// <para>this <see cref="StringRebuilder"/> is not modified.</para>
/// <para>This operation can be performed simultaneously on multiple threads.</para>
/// </remarks>
/// <exception cref="ArgumentOutOfRangeException"><paramref name="position"/> is less than zero or greater than <see cref="Length"/>.</exception>
/// <exception cref="ArgumentNullException"><paramref name="storage"/> is null.</exception>
public StringRebuilder Insert(int position, ITextStorage storage)
{
return(this.Insert(position, SimpleStringRebuilder.Create(storage)));
}
/// <summary>
/// Create a new StringRebuilder equivalent to inserting text into this <see cref="StringRebuilder"/>.
/// </summary>
/// <param name="position">Position at which to insert.</param>
/// <param name="text">Text to insert.</param>
/// <returns>A new StringRebuilder containing the insertion.</returns>
/// <remarks>
/// <para>this <see cref="StringRebuilder"/> is not modified.</para>
/// <para>This operation can be performed simultaneously on multiple threads.</para>
/// </remarks>
/// <exception cref="ArgumentOutOfRangeException"><paramref name="position"/> is less than zero or greater than <see cref="Length"/>.</exception>
/// <exception cref="ArgumentNullException"><paramref name="text"/> is null.</exception>
public StringRebuilder Insert(int position, string text)
{
return(this.Insert(position, SimpleStringRebuilder.Create(text)));
}
