public TextSnapshot(ITextBuffer textBuffer, ITextVersion version, StringRebuilder content)
: base(version)
{
System.Diagnostics.Debug.Assert(version.Length == content.Length);
this.textBuffer = textBuffer;
this.content = content;
}
public ITextBuffer CreateTextBuffer(TextReader reader, IContentType contentType, long length, string traceId, bool throwOnInvalidCharacters)
{
if (reader == null)
{
throw new ArgumentNullException(nameof(reader));
}
if (contentType == null)
{
throw new ArgumentNullException(nameof(contentType));
}
if (length > int.MaxValue)
{
throw new InvalidOperationException(Strings.FileTooLarge);
}
int longestLineLength;
StringRebuilder content = TextImageLoader.Load(
reader,
length,
out var newlineState,
out var leadingWhitespaceState,
out longestLineLength,
throwOnInvalidCharacters: throwOnInvalidCharacters);
ITextBuffer buffer = Make(contentType, content, false);
// Make the call to GetWhitespaceManager to add the manager to the properties. We don't need the return value here.
var _ = _whitespaceManagerFactory.GetOrCreateWhitespaceManager(buffer, newlineState, leadingWhitespaceState);
// Leave a sign about the longest line in the buffer. This is rather nasty, but for now
// we don't want to pollute the API with this factoid
buffer.Properties["LongestLineLength"] = longestLineLength;
return(buffer);
}
internal TextContentChangedEventArgs ApplyReload(StringRebuilder newContent, EditOptions editOptions, object editTag)
{
// we construct a normalized change list where the inserted text is a reference string that
// points "forward" to the next snapshot and whose deleted text is a reference string that points
// "backward" to the prior snapshot. This pins both snapshots in memory but that's better than materializing
// giant strings, and when (?) we have paging text storage, memory requirements will be minimal.
ITextSnapshot oldSnapshot = this.currentSnapshot;
StringRebuilder oldContent = BufferFactoryService.StringRebuilderFromSnapshotSpan(new SnapshotSpan(oldSnapshot, 0, oldSnapshot.Length));
TextChange change = TextChange.Create(oldPosition: 0,
oldText: oldContent,
newText: newContent,
currentSnapshot: oldSnapshot);
TextVersion newVersion = this.currentVersion.CreateNext(changes: null, newLength: newContent.Length, reiteratedVersionNumber: -1);
TextSnapshot newSnapshot = new TextSnapshot(this, newVersion, newContent);
this.currentVersion.SetChanges(NormalizedTextChangeCollection.Create(new TextChange[] { change },
editOptions.ComputeMinimalChange
? (StringDifferenceOptions?)editOptions.DifferenceOptions
: null,
this.textDifferencingService,
oldSnapshot, newSnapshot));
this.currentVersion = newVersion;
this.builder = newContent;
this.currentSnapshot = newSnapshot;
return(new TextContentChangedEventArgs(oldSnapshot, newSnapshot, editOptions, editTag));
}
private StringRebuilder Assemble(Span left, StringRebuilder text, Span right)
{
if (text.Length == 0)
{
return(Assemble(left, right));
}
else if (left.Length == 0)
{
return((right.Length == 0) ? text : BinaryStringRebuilder.Create(text, this.GetSubText(right)));
}
else if (right.Length == 0)
{
return(BinaryStringRebuilder.Create(this.GetSubText(left), text));
}
else if (left.Length < right.Length)
{
return(BinaryStringRebuilder.Create(BinaryStringRebuilder.Create(this.GetSubText(left), text),
this.GetSubText(right)));
}
else
{
return(BinaryStringRebuilder.Create(this.GetSubText(left),
BinaryStringRebuilder.Create(text, this.GetSubText(right))));
}
}
private TextBuffer Make(IContentType contentType, StringRebuilder content, bool spurnGroup)
{
TextBuffer buffer = new TextBuffer(contentType, content, _textDifferencingSelectorService.DefaultTextDifferencingService, _guardedOperations, spurnGroup);
RaiseTextBufferCreatedEvent(buffer);
return(buffer);
}
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(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);
}
bool hasConsistentLineEndings;
int longestLineLength;
StringRebuilder content = TextImageLoader.Load(reader, length, traceId, out hasConsistentLineEndings, out longestLineLength);
ITextBuffer buffer = Make(contentType, content, false);
if (!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.
return(buffer);
}
internal TextContentChangedEventArgs ApplyReload(StringRebuilder newContent, EditOptions editOptions, object editTag)
{
// we construct a normalized change list where the inserted text is a reference string that
// points "forward" to the next snapshot and whose deleted text is a reference string that points
// "backward" to the prior snapshot. This pins both snapshots in memory but that's better than materializing
// giant strings, and when (?) we have paging text storage, memory requirements will be minimal.
TextVersion newVersion = new TextVersion(this, this.currentVersion.VersionNumber + 1, this.currentVersion.VersionNumber + 1, newContent.Length);
ITextSnapshot oldSnapshot = this.currentSnapshot;
TextSnapshot newSnapshot = new TextSnapshot(this, newVersion, newContent);
ReferenceChangeString oldText = new ReferenceChangeString(new SnapshotSpan(oldSnapshot, 0, oldSnapshot.Length));
ReferenceChangeString newText = new ReferenceChangeString(new SnapshotSpan(newSnapshot, 0, newSnapshot.Length));
TextChange change = new TextChange(oldPosition: 0,
oldText: oldText,
newText: newText,
currentSnapshot: oldSnapshot);
this.currentVersion.AddNextVersion(NormalizedTextChangeCollection.Create(new FrugalList <TextChange>()
{
change
},
editOptions.ComputeMinimalChange
? (StringDifferenceOptions?)editOptions.DifferenceOptions
: null,
this.textDifferencingService,
oldSnapshot, newSnapshot),
newVersion);
this.builder = newContent;
this.currentVersion = newVersion;
this.currentSnapshot = newSnapshot;
return(new TextContentChangedEventArgs(oldSnapshot, newSnapshot, editOptions, editTag));
}
/// <summary>
/// Replace the contents of the buffer with the contents of a different string rebuilder.
/// </summary>
/// <param name="newContent">The new contents of the buffer (presumably read from a file).</param>
/// <param name="editOptions">Options to apply to the edit. Differencing is highly likely to be selected.</param>
/// <param name="editTag">Arbitrary tag associated with the reload that will appear in event arguments.</param>
/// <returns></returns>
public ITextSnapshot ReloadContent(StringRebuilder newContent, EditOptions editOptions, object editTag)
{
using (ReloadEdit edit = new ReloadEdit(this, this.currentSnapshot, editOptions, editTag))
{
return(edit.ReloadContent(newContent));
}
}
protected BaseSnapshot(ITextVersion2 version, StringRebuilder content)
{
this.version = version;
this.Content = content;
this.cachingContent = CachingTextImage.Create(this.Content, version.ImageVersion);
// we must extract the content type here, because the content type of the text buffer may change later.
this.contentType = version.TextBuffer.ContentType;
}
/// <summary>
/// Consolidate two string rebuilders, taking advantage of the fact that they have already extracted the line breaks.
/// </summary>
public static StringRebuilder Consolidate(StringRebuilder left, StringRebuilder right)
{
Debug.Assert(left.Length > 0);
Debug.Assert(right.Length > 0);
int length = left.Length + right.Length;
char[] result = new char[length];
left.CopyTo(0, result, 0, left.Length);
right.CopyTo(0, result, left.Length, right.Length);
ILineBreaks lineBreaks;
if ((left.LineBreakCount == 0) && (right.LineBreakCount == 0))
{
lineBreaks = LineBreakManager.Empty;
//_lineBreakSpan defaults to 0, 0 which is what we want
}
else
{
ILineBreaksEditor breaks = LineBreakManager.CreateLineBreakEditor(length, left.LineBreakCount + right.LineBreakCount);
int offset = 0;
if ((result[left.Length] == '\n') && (result[left.Length - 1] == '\r'))
{
//We have a \r\n spanning the seam ... add that as a special linebreak later.
offset = 1;
}
int leftLines = left.LineBreakCount - offset;
for (int i = 0; (i < leftLines); ++i)
{
Span extent;
int lineBreakLength;
left.GetLineFromLineNumber(i, out extent, out lineBreakLength);
breaks.Add(extent.End, lineBreakLength);
}
if (offset == 1)
{
breaks.Add(left.Length - 1, 2);
}
for (int i = offset; (i < right.LineBreakCount); ++i)
{
Span extent;
int lineBreakLength;
right.GetLineFromLineNumber(i, out extent, out lineBreakLength);
breaks.Add(extent.End + left.Length, lineBreakLength);
}
lineBreaks = breaks;
}
return(StringRebuilderForChars.Create(result, length, lineBreaks));
}
public TextBuffer(IContentType contentType, StringRebuilder content, ITextDifferencingService textDifferencingService, GuardedOperations guardedOperations, bool spurnGroup)
: base(contentType, content.Length, textDifferencingService, guardedOperations)
{
// Parameters are validated outside
this.group = new BufferGroup(this);
this.builder = content;
this.spurnGroup = spurnGroup;
this.currentSnapshot = this.TakeSnapshot();
}
private BinaryStringRebuilder(StringRebuilder left, StringRebuilder right)
: base(left.Length + right.Length, left.LineBreakCount + right.LineBreakCount, 1 + Math.Max(left.Depth, right.Depth))
{
Debug.Assert(left.Length > 0);
Debug.Assert(right.Length > 0);
Debug.Assert(Math.Abs(left.Depth - right.Depth) <= 1);
_left = left;
_right = right;
}
private CachingTextImage(StringRebuilder builder, ITextImageVersion version)
{
if (builder == null)
{
throw new ArgumentNullException(nameof(builder));
}
this.Builder = builder;
this.Version = version;
}
public ITextBuffer CreateTextBuffer(SnapshotSpan span, IContentType contentType)
{
if (contentType == null)
{
throw new ArgumentNullException(nameof(contentType));
}
StringRebuilder content = StringRebuilderFromSnapshotSpan(span);
return(Make(contentType, content, false));
}
public ITextBuffer CreateTextBuffer(string text, IContentType contentType, bool spurnGroup)
{
if (text == null)
{
throw new ArgumentNullException(nameof(text));
}
if (contentType == null)
{
throw new ArgumentNullException(nameof(contentType));
}
return(Make(contentType, StringRebuilder.Create(text), spurnGroup));
}
internal static StringRebuilder StringRebuilderFromSnapshotSpans(IList <SnapshotSpan> sourceSpans, Span selectedSourceSpans)
{
StringRebuilder content = StringRebuilder.Empty;
for (int i = 0; (i < selectedSourceSpans.Length); ++i)
{
var span = sourceSpans[selectedSourceSpans.Start + i];
content = AppendStringRebuildersFromSnapshotAndSpan(content, span.Snapshot, span.Span);
}
return(content);
}
/// <summary>
/// Consolidate two string rebuilders, taking advantage of the fact that they have already extracted the line breaks.
/// </summary>
public static SimpleStringRebuilder Create(StringRebuilder left, StringRebuilder right)
{
Debug.Assert(left.Length > 0);
Debug.Assert(right.Length > 0);
int length = left.Length + right.Length;
char[] result = new char[length];
left.CopyTo(0, result, 0, left.Length);
right.CopyTo(0, result, left.Length, right.Length);
string text = new string(result);
int[] lineBreaks;
if ((left.LineBreakCount == 0) && (right.LineBreakCount == 0))
{
lineBreaks = _emptyLineBreaks;
//_lineBreakSpan defaults to 0, 0 which is what we want
}
else
{
int offset = 0;
if ((text[left.Length] == '\n') && (text[left.Length - 1] == '\r'))
{
//We have a \r\n spanning the seam ... add that as a special linebreak later.
offset = 1;
}
lineBreaks = new int[left.LineBreakCount + right.LineBreakCount - offset];
int lastLineBreak = 0;
int leftLines = left.LineBreakCount - offset;
for (int i = 0; (i < leftLines); ++i)
{
LineSpan lineSpan = left.GetLineFromLineNumber(i);
lineBreaks[lastLineBreak++] = lineSpan.End;
}
if (offset == 1)
{
lineBreaks[lastLineBreak++] = left.Length - 1;
}
for (int i = offset; (i < right.LineBreakCount); ++i)
{
LineSpan lineSpan = right.GetLineFromLineNumber(i);
lineBreaks[lastLineBreak++] = lineSpan.End + left.Length;
}
}
return(new SimpleStringRebuilder(SimpleTextStorage.Create(text, lineBreaks)));
}
/// <summary>
/// Constructs a Text Change object.
/// </summary>
/// <param name="oldPosition">
/// The character position in the TextBuffer at which the text change happened.
/// </param>
/// <param name="oldText">
/// The text in the buffer that was replaced.
/// </param>
/// <param name="newText">
/// The text that replaces the old text.
/// </param>
/// <param name="boundaryConditions">
/// Information about neighboring line break characters.
/// </param>
public TextChange(int oldPosition, StringRebuilder oldText, StringRebuilder newText, LineBreakBoundaryConditions boundaryConditions)
{
if (oldPosition < 0)
{
throw new ArgumentOutOfRangeException(nameof(oldPosition));
}
_oldPosition = oldPosition;
_newPosition = oldPosition;
_oldText = oldText;
_newText = newText;
_lineBreakBoundaryConditions = boundaryConditions;
}
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>
/// 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, StringRebuilder text)
{
if (span.End > this.Length)
{
throw new ArgumentOutOfRangeException("span");
}
if (text == null)
{
throw new ArgumentNullException("text");
}
return(this.Assemble(Span.FromBounds(0, span.Start), text, Span.FromBounds(span.End, this.Length)));
}
/// <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, StringRebuilder text)
{
if ((position < 0) || (position > this.Length))
{
throw new ArgumentOutOfRangeException("position");
}
if (text == null)
{
throw new ArgumentNullException("text");
}
return(this.Assemble(Span.FromBounds(0, position), text, Span.FromBounds(position, this.Length)));
}
public ITextBuffer CreateTextBuffer(ITextImage image, IContentType contentType)
{
if (image == null)
{
throw new ArgumentNullException(nameof(image));
}
if (contentType == null)
{
throw new ArgumentNullException(nameof(contentType));
}
StringRebuilder content = StringRebuilder.Create(image);
return(Make(contentType, content, false));
}
private static StringRebuilder BalanceTreeNode(StringRebuilder left, StringRebuilder right)
{
if (left.Depth > right.Depth + 1)
{
return(BinaryStringRebuilder.Pivot(left, right, false));
}
else if (right.Depth > left.Depth + 1)
{
return(BinaryStringRebuilder.Pivot(right, left, true));
}
else
{
return(new BinaryStringRebuilder(left, right));
}
}
public static StringRebuilder Create(ITextStorageLoader loader)
{
if (loader == null)
{
throw new ArgumentNullException("loader");
}
StringRebuilder content = _empty;
foreach (ITextStorage storage in loader.Load())
{
content = content.Insert(content.Length, storage);
}
return(content);
}
internal static ChangeString CreateChangeString(StringRebuilder content)
{
if (content.Length == 0)
{
return(ChangeString.EmptyChangeString);
}
else if (content.Length <= ChangeString.LiteralStringThreshold)
{
return(new LiteralChangeString(content.GetText(new Span(0, content.Length))));
}
else
{
return(new ReferenceChangeString(content));
}
}
// internal for unit tests, a \r\n can't be spanned by left and right
internal BinaryStringRebuilder(StringRebuilder left, StringRebuilder right)
: base(left.Length + right.Length, left.LineBreakCount + right.LineBreakCount, left.FirstCharacter, right.LastCharacter)
{
Debug.Assert(left.Length > 0);
Debug.Assert(right.Length > 0);
Debug.Assert(Math.Abs(left.Depth - right.Depth) <= 1);
Debug.Assert(left.LastCharacter != '\r' || right.FirstCharacter != '\n');
#if DEBUG
Interlocked.Increment(ref _totalCreated);
#endif
_left = left;
_right = right;
this.Depth = 1 + Math.Max(left.Depth, right.Depth);
}
private void ReloadBufferFromStream(Stream stream, long fileSize, EditOptions options, Encoding encoding)
{
using (var streamReader = new EncodedStreamReader.NonStreamClosingStreamReader(stream, encoding, detectEncodingFromByteOrderMarks: false)) {
TextBuffer concreteBuffer = _textBuffer as TextBuffer;
if (concreteBuffer != null)
{
StringRebuilder newContent = TextImageLoader.Load(
streamReader,
fileSize,
out var newlineState,
out var leadingWhitespaceState,
out var longestLineLength);
if (!newlineState.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"] = 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();
}
}
}
}
}
public static StringRebuilder Create(ITextImage image)
{
if (image == null)
{
throw new ArgumentNullException(nameof(image));
}
var cti = image as CachingTextImage;
if (cti != null)
{
return(cti.Builder);
}
// This shouldn't happen but as a fallback, create a new string rebuilder from the text of the provided image.
return(StringRebuilder.Create(image.GetText(0, image.Length)));
}
internal static StringRebuilder AppendStringRebuildersFromSnapshotAndSpan(StringRebuilder content, ITextSnapshot snapshot, Span span)
{
var baseSnapshot = snapshot as BaseSnapshot;
if (baseSnapshot != null)
{
content = content.Append(baseSnapshot.Content.GetSubText(span));
}
else
{
// The we don't know what to do fallback. This should never be called unless someone provides a new snapshot
// implementation.
content = content.Append(snapshot.GetText(span));
}
return(content);
}
