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//
// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License. See License.txt in the project root for license information.
//
// This file contain implementations details that are subject to change without notice.
// Use at your own risk.
//
namespace Microsoft.VisualStudio.Text.Projection.Implementation
{
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Text;
using Microsoft.VisualStudio.Text.Implementation;
using Microsoft.VisualStudio.Utilities;
using Microsoft.VisualStudio.Text.Differencing;
using Microsoft.VisualStudio.Text.Utilities;
using System.Collections.ObjectModel;
internal abstract class BaseProjectionBuffer : BaseBuffer, IProjectionBufferBase
{
#region State and construction
protected internal readonly IProjectionEditResolver resolver;
protected bool editApplicationInProgress;
protected List<TextContentChangedEventArgs> pendingContentChangedEventArgs = new List<TextContentChangedEventArgs>();
protected BaseProjectionBuffer(IProjectionEditResolver resolver, IContentType contentType, ITextDifferencingService textDifferencingService, GuardedOperations guardedOperations)
: base(contentType, 0, textDifferencingService, guardedOperations)
{
this.resolver = resolver; // null is OK
}
#endregion
#region Source buffer event handling
internal abstract void OnSourceTextChanged(object sender, TextContentChangedEventArgs e);
internal virtual void OnSourceBufferReadOnlyRegionsChanged(object sender, SnapshotSpanEventArgs e)
{
NormalizedSpanCollection mappedAffectedSpans = new NormalizedSpanCollection(this.CurrentBaseSnapshot.MapFromSourceSnapshot(e.Span));
if (mappedAffectedSpans.Count > 0)
{
ITextEventRaiser raiser =
new ReadOnlyRegionsChangedEventRaiser(new SnapshotSpan(this.currentSnapshot,
Span.FromBounds(mappedAffectedSpans[0].Start,
mappedAffectedSpans[mappedAffectedSpans.Count - 1].End)));
this.group.BeginEdit();
this.group.EnqueueEvents(raiser, this);
this.group.FinishEdit();
}
}
internal void OnSourceBufferContentTypeChanged(object sender, ContentTypeChangedEventArgs e)
{
TextContentChangedEventArgs args = new TextContentChangedEventArgs(e.Before, e.After, EditOptions.None, e.EditTag);
this.pendingContentChangedEventArgs.Add(args);
this.group.ScheduleIndependentEdit(this);
}
#endregion
#region Editing Shortcuts
public new IProjectionSnapshot Insert(int position, string text)
{
return (IProjectionSnapshot)base.Insert(position, text);
}
public new IProjectionSnapshot Delete(Span deleteSpan)
{
return (IProjectionSnapshot)base.Delete(deleteSpan);
}
public new IProjectionSnapshot Replace(Span replaceSpan, string replaceWith)
{
return (IProjectionSnapshot)base.Replace(replaceSpan, replaceWith);
}
#endregion
#region Read Only Region support
protected internal override bool IsReadOnlyImplementation(int position, bool isEdit)
{
if (this.CurrentBaseSnapshot.SpanCount == 0)
{
throw new InvalidOperationException();
}
if (base.IsReadOnlyImplementation(position, isEdit))
{
return true;
}
return AreBaseBuffersReadOnly(position, isEdit);
}
private bool AreBaseBuffersReadOnly(int position, bool isEdit)
{
// a position on a seam between two or more source spans is readonly only
// if that position is readonly in all of the source buffers.
ReadOnlyCollection<SnapshotPoint> snapPoints = this.CurrentBaseSnapshot.MapInsertionPointToSourceSnapshots(position, null);
foreach (SnapshotPoint snapPoint in snapPoints)
{
BaseBuffer baseBuffer = (BaseBuffer)snapPoint.Snapshot.TextBuffer;
if (!baseBuffer.IsReadOnlyImplementation(snapPoint.Position, isEdit))
{
return false;
}
}
return true;
}
protected internal override bool IsReadOnlyImplementation(Span span, bool isEdit)
{
if (this.CurrentSnapshot.SpanCount == 0)
{
throw new InvalidOperationException();
}
if (base.IsReadOnlyImplementation(span, isEdit))
{
return true;
}
return AreBaseBuffersReadOnly(span, isEdit);
}
public bool AreBaseBuffersReadOnly(Span span, bool isEdit)
{
if (span.Length == 0)
{
// treat like an insertion!
return AreBaseBuffersReadOnly(span.Start, isEdit);
}
else
{
IList<SnapshotSpan> snapSpans = this.CurrentBaseSnapshot.MapToSourceSnapshots(span);
foreach (SnapshotSpan snapSpan in snapSpans)
{
BaseBuffer baseBuffer = (BaseBuffer)snapSpan.Snapshot.TextBuffer;
if (baseBuffer.IsReadOnlyImplementation(snapSpan, isEdit))
{
return true;
}
}
return false;
}
}
protected internal override NormalizedSpanCollection GetReadOnlyExtentsImplementation(Span span)
{
// TODO: make something other than dead slow
FrugalList<Span> result = new FrugalList<Span>(base.GetReadOnlyExtentsImplementation(span));
IList<SnapshotSpan> restrictionSpans = this.CurrentBaseSnapshot.MapToSourceSnapshotsForRead(span);
foreach (SnapshotSpan restrictionSpan in restrictionSpans)
{
SnapshotSpan? overlapSpan = (restrictionSpan.Span == span) ? restrictionSpan : restrictionSpan.Overlap(span);
if (overlapSpan.HasValue)
{
BaseBuffer baseBuffer = (BaseBuffer)restrictionSpan.Snapshot.TextBuffer;
NormalizedSpanCollection sourceExtents = baseBuffer.GetReadOnlyExtents(overlapSpan.Value);
foreach (Span sourceExtent in sourceExtents)
{
result.AddRange(this.CurrentBaseSnapshot.MapFromSourceSnapshot(new SnapshotSpan(restrictionSpan.Snapshot, sourceExtent)));
}
}
}
return new NormalizedSpanCollection(result);
}
#endregion
#region Abstract members
protected abstract BaseProjectionSnapshot CurrentBaseSnapshot { get; }
public override abstract ITextEdit CreateEdit(EditOptions options, int? reiteratedVersionNumber, object editTag);
protected internal override abstract ISubordinateTextEdit CreateSubordinateEdit(EditOptions options, int? reiteratedVersionNumber, object editTag);
protected override abstract BaseSnapshot TakeSnapshot();
public new abstract IProjectionSnapshot CurrentSnapshot { get; }
public abstract IList<ITextBuffer> SourceBuffers { get; }
public abstract BaseBuffer.ITextEventRaiser PropagateSourceChanges(EditOptions options, object editTag);
#endregion
#region Debug support
[Conditional("_DEBUG")]
protected void DumpPendingChanges(List<Tuple<ITextBuffer, List<TextChange>>> pendingSourceChanges)
{
if (BufferGroup.Tracing)
{
StringBuilder sb = new StringBuilder(string.Format(System.Globalization.CultureInfo.CurrentCulture, "Pending Changes in {0}\r\n", TextUtilities.GetTag(this)));
foreach (var p in pendingSourceChanges)
{
sb.AppendLine(TextUtilities.GetTag(p.Item1));
for (int c = 0; c < p.Item2.Count - 1; ++c) // don't display sentinel
{
sb.AppendLine(p.Item2[c].ToString());
}
}
sb.AppendLine("");
Debug.Write(sb.ToString());
}
}
[Conditional("_DEBUG")]
protected void DumpPendingContentChangedEventArgs()
{
if (BufferGroup.Tracing)
{
StringBuilder sb = new StringBuilder(string.Format(System.Globalization.CultureInfo.CurrentCulture, "Pending Change Events in {0}\r\n", TextUtilities.GetTag(this)));
foreach (var args in this.pendingContentChangedEventArgs)
{
sb.Append(TextUtilities.GetTag(args.Before.TextBuffer));
sb.Append(" V");
sb.AppendLine(args.After.Version.VersionNumber.ToString());
foreach (var change in args.Changes)
{
sb.AppendLine(change.ToString());
}
}
sb.AppendLine("");
Debug.Write(sb.ToString());
}
}
#endregion
}
}
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