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using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Diagnostics;
using System.Linq;
using System.Threading;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.Editor;
using Microsoft.CodeAnalysis.Editor.Shared.Extensions;
using Microsoft.CodeAnalysis.Editor.Shared.Utilities;
using Microsoft.CodeAnalysis.Formatting;
using Microsoft.CodeAnalysis.Formatting.Rules;
using Microsoft.CodeAnalysis.LanguageServices;
using Microsoft.CodeAnalysis.Options;
using Microsoft.CodeAnalysis.Shared.Extensions;
using Microsoft.CodeAnalysis.Text;
using Microsoft.VisualStudio.Text;
using Microsoft.VisualStudio.Text.Differencing;
using Microsoft.VisualStudio.Text.Editor;
using Microsoft.VisualStudio.Text.Editor.OptionsExtensionMethods;
using Microsoft.VisualStudio.Text.Projection;
using MonoDevelop.Ide.Composition;
using MonoDevelop.Ide.TypeSystem;
using Roslyn.Utilities;
namespace MonoDevelop.Ide.Completion.Presentation
{
public class MonoDevelopContainedDocument : IMonoDevelopHostDocument
{
private const string ReturnReplacementString = @"{|r|}";
private const string NewLineReplacementString = @"{|n|}";
private const string HTML = nameof (HTML);
private const string HTMLX = nameof (HTMLX);
private const string Razor = nameof (Razor);
private const string XOML = nameof (XOML);
private const char RazorExplicit = '@';
private const string CSharpRazorBlock = "{";
private const string VBRazorBlock = "code";
private const string HelperRazor = "helper";
private const string FunctionsRazor = "functions";
private const string CodeRazor = "code";
private static readonly EditOptions s_venusEditOptions = new EditOptions (new StringDifferenceOptions {
DifferenceType = StringDifferenceTypes.Character,
IgnoreTrimWhiteSpace = false
});
public ITextBuffer LanguageBuffer { get; private set; }
public IProjectionBuffer DataBuffer { get; private set; }
public IMonoDevelopContainedLanguageHost ContainedLanguageHost { get; private set; }
private readonly HostType _hostType;
// _workspace will only be set once the Workspace is available
private Workspace _workspace;
private readonly ITextDifferencingSelectorService _differenceSelectorService;
public DocumentId Id { get; private set; }
// Language will only be set once the Workspace is available
private string Language { get; set; }
public static MonoDevelopContainedDocument FromDocument(Document document)
{
return MonoDevelopHostDocumentRegistration.FromDocument(document) as MonoDevelopContainedDocument;
}
public static MonoDevelopContainedDocument AttachToBuffer(ITextBuffer languageBuffer, IProjectionBuffer dataBuffer, IMonoDevelopContainedLanguageHost containedLanguageHost)
{
return new MonoDevelopContainedDocument(languageBuffer, dataBuffer, containedLanguageHost);
}
public static void DetachFromBuffer(ITextBuffer languageBuffer)
{
MonoDevelopHostDocumentRegistration.UnRegister (languageBuffer);
}
private MonoDevelopContainedDocument (ITextBuffer languageBuffer, IProjectionBuffer dataBuffer, IMonoDevelopContainedLanguageHost containedLanguageHost)
{
LanguageBuffer = languageBuffer;
DataBuffer = dataBuffer;
ContainedLanguageHost = containedLanguageHost;
_differenceSelectorService = CompositionManager.Instance.GetExportedValue<ITextDifferencingSelectorService> ();
var container = languageBuffer.CurrentSnapshot.AsText ().Container;
var registration = Workspace.GetWorkspaceRegistration (container);
_hostType = GetHostType ();
if (registration.Workspace == null)
{
registration.WorkspaceChanged += Registration_WorkspaceChanged;
}
else
{
FinishInitialization ();
}
}
private void Registration_WorkspaceChanged (object sender, EventArgs e)
{
var container = LanguageBuffer.CurrentSnapshot.AsText ().Container;
var registration = Workspace.GetWorkspaceRegistration (container);
registration.WorkspaceChanged -= Registration_WorkspaceChanged;
FinishInitialization ();
}
private void FinishInitialization ()
{
var document = LanguageBuffer.CurrentSnapshot.GetOpenDocumentInCurrentContextWithChangesSafe ();
var project = document.Project;
_workspace = project.Solution.Workspace;
Language = project.Language;
Id = document.Id;
MonoDevelopHostDocumentRegistration.Register (LanguageBuffer, this);
}
private HostType GetHostType ()
{
if (DataBuffer is IProjectionBuffer projectionBuffer) {
// RazorCSharp has an HTMLX base type but should not be associated with
// the HTML host type, so we check for it first.
if (projectionBuffer.SourceBuffers.Any (b => b.ContentType.IsOfType (Razor))) {
return HostType.Razor;
}
// For TypeScript hosted in HTML the source buffers will have type names
// HTMLX and TypeScript.
if (projectionBuffer.SourceBuffers.Any (b => b.ContentType.IsOfType (HTML) ||
b.ContentType.IsOfType (HTMLX))) {
return HostType.HTML;
}
} else {
// XOML is set up differently. For XOML, the secondary buffer (i.e. SubjectBuffer)
// is a projection buffer, while the primary buffer (i.e. DataBuffer) is not. Instead,
// the primary buffer is a regular unprojected ITextBuffer with the HTML content type.
if (DataBuffer.CurrentSnapshot.ContentType.IsOfType (HTML)) {
return HostType.XOML;
}
}
throw ExceptionUtilities.Unreachable;
}
public ITextBuffer GetOpenTextBuffer ()
{
return LanguageBuffer;
}
public void UpdateText (SourceText newText)
{
if (_workspace == null) {
return;
}
var subjectBuffer = (IProjectionBuffer)this.GetOpenTextBuffer ();
var originalSnapshot = LanguageBuffer.CurrentSnapshot;
var originalText = originalSnapshot.AsText ();
var changes = newText.GetTextChanges (originalText);
IEnumerable<int> affectedVisibleSpanIndices = null;
var editorVisibleSpansInOriginal = SharedPools.Default<List<TextSpan>> ().AllocateAndClear ();
try {
var originalDocument = _workspace.CurrentSolution.GetDocument (this.Id);
editorVisibleSpansInOriginal.AddRange (GetEditorVisibleSpans ());
var newChanges = FilterTextChanges (originalText, editorVisibleSpansInOriginal, changes).ToList ();
if (newChanges.Count == 0) {
// no change to apply
return;
}
ApplyChanges (subjectBuffer, newChanges, editorVisibleSpansInOriginal, out affectedVisibleSpanIndices);
AdjustIndentation (subjectBuffer, affectedVisibleSpanIndices);
}
finally {
SharedPools.Default<HashSet<int>> ().ClearAndFree ((HashSet<int>)affectedVisibleSpanIndices);
SharedPools.Default<List<TextSpan>> ().ClearAndFree (editorVisibleSpansInOriginal);
}
}
private IEnumerable<TextChange> FilterTextChanges (SourceText originalText, List<TextSpan> editorVisibleSpansInOriginal, IReadOnlyList<TextChange> changes)
{
// no visible spans or changes
if (editorVisibleSpansInOriginal.Count == 0 || changes.Count == 0) {
// return empty one
yield break;
}
using (var pooledObject = SharedPools.Default<List<TextChange>> ().GetPooledObject ()) {
var changeQueue = pooledObject.Object;
changeQueue.AddRange (changes);
var spanIndex = 0;
var changeIndex = 0;
for (; spanIndex < editorVisibleSpansInOriginal.Count; spanIndex++) {
var visibleSpan = editorVisibleSpansInOriginal[spanIndex];
var visibleTextSpan = GetVisibleTextSpan (originalText, visibleSpan, uptoFirstAndLastLine: true);
for (; changeIndex < changeQueue.Count; changeIndex++) {
var change = changeQueue[changeIndex];
// easy case first
if (change.Span.End < visibleSpan.Start) {
// move to next change
continue;
}
if (visibleSpan.End < change.Span.Start) {
// move to next visible span
break;
}
// make sure we are not replacing whitespace around start and at the end of visible span
if (WhitespaceOnEdges (originalText, visibleTextSpan, change)) {
continue;
}
if (visibleSpan.Contains (change.Span)) {
yield return change;
continue;
}
// now it is complex case where things are intersecting each other
var subChanges = GetSubTextChanges (originalText, change, visibleSpan).ToList ();
if (subChanges.Count > 0) {
if (subChanges.Count == 1 && subChanges[0] == change) {
// we can't break it. not much we can do here. just don't touch and ignore this change
continue;
}
changeQueue.InsertRange (changeIndex + 1, subChanges);
continue;
}
}
}
}
}
private bool WhitespaceOnEdges (SourceText text, TextSpan visibleTextSpan, TextChange change)
{
if (!string.IsNullOrWhiteSpace (change.NewText)) {
return false;
}
if (change.Span.End <= visibleTextSpan.Start) {
return true;
}
if (visibleTextSpan.End <= change.Span.Start) {
return true;
}
return false;
}
private IEnumerable<TextChange> GetSubTextChanges (SourceText originalText, TextChange changeInOriginalText, TextSpan visibleSpanInOriginalText)
{
using (var changes = SharedPools.Default<List<TextChange>> ().GetPooledObject ()) {
var leftText = originalText.ToString (changeInOriginalText.Span);
var rightText = changeInOriginalText.NewText;
var offsetInOriginalText = changeInOriginalText.Span.Start;
if (TryGetSubTextChanges (originalText, visibleSpanInOriginalText, leftText, rightText, offsetInOriginalText, changes.Object)) {
return changes.Object.ToList ();
}
return GetSubTextChanges (originalText, visibleSpanInOriginalText, leftText, rightText, offsetInOriginalText);
}
}
private bool TryGetSubTextChanges (
SourceText originalText, TextSpan visibleSpanInOriginalText, string leftText, string rightText, int offsetInOriginalText, List<TextChange> changes)
{
// these are expensive. but hopefully we don't hit this as much except the boundary cases.
using (var leftPool = SharedPools.Default<List<TextSpan>> ().GetPooledObject ())
using (var rightPool = SharedPools.Default<List<TextSpan>> ().GetPooledObject ()) {
var spansInLeftText = leftPool.Object;
var spansInRightText = rightPool.Object;
if (TryGetWhitespaceOnlyChanges (leftText, rightText, spansInLeftText, spansInRightText)) {
for (var i = 0; i < spansInLeftText.Count; i++) {
var spanInLeftText = spansInLeftText[i];
var spanInRightText = spansInRightText[i];
if (spanInLeftText.IsEmpty && spanInRightText.IsEmpty) {
continue;
}
var spanInOriginalText = new TextSpan (offsetInOriginalText + spanInLeftText.Start, spanInLeftText.Length);
if (TryGetSubTextChange (originalText, visibleSpanInOriginalText, rightText, spanInOriginalText, spanInRightText, out var textChange)) {
changes.Add (textChange);
}
}
return true;
}
return false;
}
}
private IEnumerable<TextChange> GetSubTextChanges (
SourceText originalText, TextSpan visibleSpanInOriginalText, string leftText, string rightText, int offsetInOriginalText)
{
// these are expensive. but hopefully we don't hit this as much except the boundary cases.
using (var leftPool = SharedPools.Default<List<ValueTuple<int, int>>> ().GetPooledObject ())
using (var rightPool = SharedPools.Default<List<ValueTuple<int, int>>> ().GetPooledObject ()) {
var leftReplacementMap = leftPool.Object;
var rightReplacementMap = rightPool.Object;
GetTextWithReplacements (leftText, rightText, leftReplacementMap, rightReplacementMap, out var leftTextWithReplacement, out var rightTextWithReplacement);
var diffResult = DiffStrings (leftTextWithReplacement, rightTextWithReplacement);
foreach (var difference in diffResult) {
var spanInLeftText = AdjustSpan (diffResult.LeftDecomposition.GetSpanInOriginal (difference.Left), leftReplacementMap);
var spanInRightText = AdjustSpan (diffResult.RightDecomposition.GetSpanInOriginal (difference.Right), rightReplacementMap);
var spanInOriginalText = new TextSpan (offsetInOriginalText + spanInLeftText.Start, spanInLeftText.Length);
if (TryGetSubTextChange (originalText, visibleSpanInOriginalText, rightText, spanInOriginalText, spanInRightText.ToTextSpan (), out var textChange)) {
yield return textChange;
}
}
}
}
private bool TryGetWhitespaceOnlyChanges (string leftText, string rightText, List<TextSpan> spansInLeftText, List<TextSpan> spansInRightText)
{
return TryGetWhitespaceGroup (leftText, spansInLeftText) && TryGetWhitespaceGroup (rightText, spansInRightText) && spansInLeftText.Count == spansInRightText.Count;
}
private bool TryGetWhitespaceGroup (string text, List<TextSpan> groups)
{
if (text.Length == 0) {
groups.Add (new TextSpan (0, 0));
return true;
}
var start = 0;
for (var i = 0; i < text.Length; i++) {
var ch = text[i];
switch (ch) {
case ' ':
case '\t':
if (!TextAt (text, i - 1, ' ') && !TextAt (text, i - 1, '\t')) {
start = i;
}
break;
case '\r':
case '\n':
if (i == 0) {
groups.Add (TextSpan.FromBounds (0, 0));
}
else if (TextAt (text, i - 1, ' ') || TextAt (text, i - 1, '\t')) {
groups.Add (TextSpan.FromBounds (start, i));
}
else if (TextAt (text, i - 1, '\n')) {
groups.Add (TextSpan.FromBounds (start, i));
}
start = i + 1;
break;
default:
return false;
}
}
if (start <= text.Length) {
groups.Add (TextSpan.FromBounds (start, text.Length));
}
return true;
}
private bool TextAt (string text, int index, char ch)
{
if (index < 0 || text.Length <= index) {
return false;
}
return text[index] == ch;
}
private bool TryGetSubTextChange (
SourceText originalText, TextSpan visibleSpanInOriginalText,
string rightText, TextSpan spanInOriginalText, TextSpan spanInRightText, out TextChange textChange)
{
textChange = default(TextChange);
var visibleFirstLineInOriginalText = originalText.Lines.GetLineFromPosition (visibleSpanInOriginalText.Start);
var visibleLastLineInOriginalText = originalText.Lines.GetLineFromPosition (visibleSpanInOriginalText.End);
// skip easy case
// 1. things are out of visible span
if (!visibleSpanInOriginalText.IntersectsWith (spanInOriginalText)) {
return false;
}
// 2. there are no intersects
var snippetInRightText = rightText.Substring (spanInRightText.Start, spanInRightText.Length);
if (visibleSpanInOriginalText.Contains (spanInOriginalText) && visibleSpanInOriginalText.End != spanInOriginalText.End) {
textChange = new TextChange (spanInOriginalText, snippetInRightText);
return true;
}
// okay, more complex case. things are intersecting boundaries.
var firstLineOfRightTextSnippet = snippetInRightText.GetFirstLineText ();
var lastLineOfRightTextSnippet = snippetInRightText.GetLastLineText ();
// there are 4 complex cases - these are all heuristic. not sure what better way I have. and the heuristic is heavily based on
// text differ's behavior.
// 1. it is a single line
if (visibleFirstLineInOriginalText.LineNumber == visibleLastLineInOriginalText.LineNumber) {
// don't do anything
return false;
}
// 2. replacement contains visible spans
if (spanInOriginalText.Contains (visibleSpanInOriginalText)) {
// header
// don't do anything
// body
textChange = new TextChange (
TextSpan.FromBounds (visibleFirstLineInOriginalText.EndIncludingLineBreak, visibleLastLineInOriginalText.Start),
snippetInRightText.Substring (firstLineOfRightTextSnippet.Length, snippetInRightText.Length - firstLineOfRightTextSnippet.Length - lastLineOfRightTextSnippet.Length));
// footer
// don't do anything
return true;
}
// 3. replacement intersects with start
if (spanInOriginalText.Start < visibleSpanInOriginalText.Start &&
visibleSpanInOriginalText.Start <= spanInOriginalText.End &&
spanInOriginalText.End < visibleSpanInOriginalText.End) {
// header
// don't do anything
// body
if (visibleFirstLineInOriginalText.EndIncludingLineBreak <= spanInOriginalText.End) {
textChange = new TextChange (
TextSpan.FromBounds (visibleFirstLineInOriginalText.EndIncludingLineBreak, spanInOriginalText.End),
snippetInRightText.Substring (firstLineOfRightTextSnippet.Length));
return true;
}
return false;
}
// 4. replacement intersects with end
if (visibleSpanInOriginalText.Start < spanInOriginalText.Start &&
spanInOriginalText.Start <= visibleSpanInOriginalText.End &&
visibleSpanInOriginalText.End <= spanInOriginalText.End) {
// body
if (spanInOriginalText.Start <= visibleLastLineInOriginalText.Start) {
textChange = new TextChange (
TextSpan.FromBounds (spanInOriginalText.Start, visibleLastLineInOriginalText.Start),
snippetInRightText.Substring (0, snippetInRightText.Length - lastLineOfRightTextSnippet.Length));
return true;
}
// footer
// don't do anything
return false;
}
// if it got hit, then it means there is a missing case
throw ExceptionUtilities.Unreachable;
}
private IHierarchicalDifferenceCollection DiffStrings (string leftTextWithReplacement, string rightTextWithReplacement)
{
var document = LanguageBuffer.CurrentSnapshot.GetOpenDocumentInCurrentContextWithChangesSafe ();
var diffService = _differenceSelectorService.GetTextDifferencingService (
_workspace.Services.GetLanguageServices (document.Project.Language).GetService<IContentTypeLanguageService> ().GetDefaultContentType ());
diffService = diffService ?? _differenceSelectorService.DefaultTextDifferencingService;
return diffService.DiffStrings (leftTextWithReplacement, rightTextWithReplacement, s_venusEditOptions.DifferenceOptions);
}
private void GetTextWithReplacements (
string leftText, string rightText,
List<ValueTuple<int, int>> leftReplacementMap, List<ValueTuple<int, int>> rightReplacementMap,
out string leftTextWithReplacement, out string rightTextWithReplacement)
{
// to make diff works better, we choose replacement strings that don't appear in both texts.
var returnReplacement = GetReplacementStrings (leftText, rightText, ReturnReplacementString);
var newLineReplacement = GetReplacementStrings (leftText, rightText, NewLineReplacementString);
leftTextWithReplacement = GetTextWithReplacementMap (leftText, returnReplacement, newLineReplacement, leftReplacementMap);
rightTextWithReplacement = GetTextWithReplacementMap (rightText, returnReplacement, newLineReplacement, rightReplacementMap);
}
private static string GetReplacementStrings (string leftText, string rightText, string initialReplacement)
{
if (leftText.IndexOf (initialReplacement, StringComparison.Ordinal) < 0 && rightText.IndexOf (initialReplacement, StringComparison.Ordinal) < 0) {
return initialReplacement;
}
// okay, there is already one in the given text.
const string format = "{{|{0}|{1}|{0}|}}";
for (var i = 0; true; i++) {
var replacement = string.Format (format, i.ToString (), initialReplacement);
if (leftText.IndexOf (replacement, StringComparison.Ordinal) < 0 && rightText.IndexOf (replacement, StringComparison.Ordinal) < 0) {
return replacement;
}
}
}
private string GetTextWithReplacementMap (string text, string returnReplacement, string newLineReplacement, List<ValueTuple<int, int>> replacementMap)
{
var delta = 0;
var returnLength = returnReplacement.Length;
var newLineLength = newLineReplacement.Length;
var sb = StringBuilderPool.Allocate ();
for (var i = 0; i < text.Length; i++) {
var ch = text[i];
if (ch == '\r') {
sb.Append (returnReplacement);
delta += returnLength - 1;
replacementMap.Add (ValueTuple.Create (i + delta, delta));
continue;
}
else if (ch == '\n') {
sb.Append (newLineReplacement);
delta += newLineLength - 1;
replacementMap.Add (ValueTuple.Create (i + delta, delta));
continue;
}
sb.Append (ch);
}
return StringBuilderPool.ReturnAndFree (sb);
}
private Span AdjustSpan (Span span, List<ValueTuple<int, int>> replacementMap)
{
var start = span.Start;
var end = span.End;
for (var i = 0; i < replacementMap.Count; i++) {
var positionAndDelta = replacementMap[i];
if (positionAndDelta.Item1 <= span.Start) {
start = span.Start - positionAndDelta.Item2;
}
if (positionAndDelta.Item1 <= span.End) {
end = span.End - positionAndDelta.Item2;
}
if (positionAndDelta.Item1 > span.End) {
break;
}
}
return Span.FromBounds (start, end);
}
public IEnumerable<TextSpan> GetEditorVisibleSpans ()
{
return DataBuffer.CurrentSnapshot
.GetSourceSpans ()
.Where (ss => ss.Snapshot.TextBuffer == LanguageBuffer)
.Select (s => s.Span.ToTextSpan ())
.OrderBy (s => s.Start);
}
private static void ApplyChanges (
IProjectionBuffer subjectBuffer,
IEnumerable<TextChange> changes,
IList<TextSpan> visibleSpansInOriginal,
out IEnumerable<int> affectedVisibleSpansInNew)
{
using (var edit = subjectBuffer.CreateEdit (s_venusEditOptions, reiteratedVersionNumber: null, editTag: null)) {
var affectedSpans = SharedPools.Default<HashSet<int>> ().AllocateAndClear ();
affectedVisibleSpansInNew = affectedSpans;
var currentVisibleSpanIndex = 0;
foreach (var change in changes) {
// Find the next visible span that either overlaps or intersects with
while (currentVisibleSpanIndex < visibleSpansInOriginal.Count &&
visibleSpansInOriginal[currentVisibleSpanIndex].End < change.Span.Start) {
currentVisibleSpanIndex++;
}
// no more place to apply text changes
if (currentVisibleSpanIndex >= visibleSpansInOriginal.Count) {
break;
}
var newText = change.NewText;
var span = new Span(change.Span.Start, change.Span.Length);
edit.Replace (span, newText);
affectedSpans.Add (currentVisibleSpanIndex);
}
edit.ApplyAndLogExceptions ();
}
}
private void AdjustIndentation (IProjectionBuffer subjectBuffer, IEnumerable<int> visibleSpanIndex)
{
if (!visibleSpanIndex.Any ()) {
return;
}
var snapshot = subjectBuffer.CurrentSnapshot;
var document = _workspace.CurrentSolution.GetDocument (this.Id);
if (!document.SupportsSyntaxTree) {
return;
}
var originalText = document.GetTextAsync (CancellationToken.None).WaitAndGetResult (CancellationToken.None);
Debug.Assert (object.ReferenceEquals (originalText, snapshot.AsText ()));
var root = document.GetSyntaxRootSynchronously (CancellationToken.None);
var editorOptionsFactory = CompositionManager.Instance.GetExportedValue<IEditorOptionsFactoryService> ();
var editorOptions = editorOptionsFactory.GetOptions (DataBuffer);
var options = _workspace.Options
.WithChangedOption (FormattingOptions.NewLine, root.Language, editorOptions.GetNewLineCharacter ())
.WithChangedOption (FormattingOptions.UseTabs, root.Language, !editorOptions.IsConvertTabsToSpacesEnabled ())
.WithChangedOption (FormattingOptions.TabSize, root.Language, editorOptions.GetTabSize ())
.WithChangedOption (FormattingOptions.IndentationSize, root.Language, editorOptions.GetIndentSize ());
using (var pooledObject = SharedPools.Default<List<TextSpan>> ().GetPooledObject ()) {
var spans = pooledObject.Object;
spans.AddRange (this.GetEditorVisibleSpans ());
using (var edit = subjectBuffer.CreateEdit (s_venusEditOptions, reiteratedVersionNumber: null, editTag: null)) {
foreach (var spanIndex in visibleSpanIndex) {
var rule = GetBaseIndentationRule (root, originalText, spans, spanIndex);
var visibleSpan = spans[spanIndex];
AdjustIndentationForSpan (document, edit, visibleSpan, rule, options);
}
edit.Apply ();
}
}
}
private void AdjustIndentationForSpan (
Document document, ITextEdit edit, TextSpan visibleSpan, AbstractFormattingRule baseIndentationRule, OptionSet options)
{
var root = document.GetSyntaxRootSynchronously (CancellationToken.None);
using (var rulePool = SharedPools.Default<List<AbstractFormattingRule>> ().GetPooledObject ())
using (var spanPool = SharedPools.Default<List<TextSpan>> ().GetPooledObject ()) {
var venusFormattingRules = rulePool.Object;
var visibleSpans = spanPool.Object;
venusFormattingRules.Add (baseIndentationRule);
venusFormattingRules.Add (ContainedDocumentPreserveFormattingRule.Instance);
var formattingRules = venusFormattingRules.Concat (Formatter.GetDefaultFormattingRules (document));
var workspace = document.Project.Solution.Workspace;
var changes = Formatter.GetFormattedTextChanges (
root, new TextSpan [] { CommonFormattingHelpers.GetFormattingSpan (root, visibleSpan) },
workspace, options, formattingRules, CancellationToken.None);
visibleSpans.Add (visibleSpan);
var newChanges = FilterTextChanges (document.GetTextAsync (CancellationToken.None).WaitAndGetResult (CancellationToken.None), visibleSpans, new ReadOnlyCollection<TextChange>(changes)).Where (t => visibleSpan.Contains (t.Span));
foreach (var change in newChanges) {
edit.Replace (new Span(change.Span.Start, change.Span.Length), change.NewText);
}
}
}
internal BaseIndentationFormattingRule GetBaseIndentationRule (SyntaxNode root, SourceText text, List<TextSpan> spans, int spanIndex)
{
var currentSpanIndex = spanIndex;
GetVisibleAndTextSpan (text, spans, currentSpanIndex, out var visibleSpan, out var visibleTextSpan);
var end = visibleSpan.End;
var current = root.FindToken (visibleTextSpan.Start).Parent;
while (current != null) {
if (current.Span.Start == visibleTextSpan.Start) {
var blockType = GetRazorCodeBlockType (visibleSpan.Start);
if (blockType == RazorCodeBlockType.Explicit) {
var baseIndentation = GetBaseIndentation (root, text, visibleSpan);
return new BaseIndentationFormattingRule (root, TextSpan.FromBounds (visibleSpan.Start, end), baseIndentation);
}
}
if (current.Span.Start < visibleSpan.Start) {
var blockType = GetRazorCodeBlockType (visibleSpan.Start);
if (blockType == RazorCodeBlockType.Block || blockType == RazorCodeBlockType.Helper) {
var baseIndentation = GetBaseIndentation (root, text, visibleSpan);
return new BaseIndentationFormattingRule (root, TextSpan.FromBounds (visibleSpan.Start, end), baseIndentation);
}
if (currentSpanIndex == 0) {
break;
}
GetVisibleAndTextSpan (text, spans, --currentSpanIndex, out visibleSpan, out visibleTextSpan);
continue;
}
current = current.Parent;
}
var span = spans[spanIndex];
var indentation = GetBaseIndentation (root, text, span);
return new BaseIndentationFormattingRule (root, span, indentation);
}
private void GetVisibleAndTextSpan (SourceText text, List<TextSpan> spans, int spanIndex, out TextSpan visibleSpan, out TextSpan visibleTextSpan)
{
visibleSpan = spans[spanIndex];
visibleTextSpan = GetVisibleTextSpan (text, visibleSpan);
if (visibleTextSpan.IsEmpty) {
// span has no text in them
visibleTextSpan = visibleSpan;
}
}
private int GetBaseIndentation (SyntaxNode root, SourceText text, TextSpan span)
{
// Is this right? We should probably get this from the IVsContainedLanguageHost instead.
var editorOptionsFactory = CompositionManager.Instance.GetExportedValue<IEditorOptionsFactoryService> ();
var editorOptions = editorOptionsFactory.GetOptions (DataBuffer);
var additionalIndentation = GetAdditionalIndentation (root, text, span);
// Skip over the first line, since it's in "Venus space" anyway.
var startingLine = text.Lines.GetLineFromPosition (span.Start);
for (var line = startingLine; line.Start < span.End; line = text.Lines[line.LineNumber + 1]) {
ContainedLanguageHost.GetLineIndent (
line.LineNumber,
out var baseIndentationString,
out var parent,
out var indentSize,
out var useTabs,
out var tabSize);
if (!string.IsNullOrEmpty (baseIndentationString)) {
return baseIndentationString.GetColumnFromLineOffset (baseIndentationString.Length, editorOptions.GetTabSize ()) + additionalIndentation;
}
}
return additionalIndentation;
}
private TextSpan GetVisibleTextSpan (SourceText text, TextSpan visibleSpan, bool uptoFirstAndLastLine = false)
{
var start = visibleSpan.Start;
for (; start < visibleSpan.End; start++) {
if (!char.IsWhiteSpace (text[start])) {
break;
}
}
var end = visibleSpan.End - 1;
if (start <= end) {
for (; start <= end; end--) {
if (!char.IsWhiteSpace (text[end])) {
break;
}
}
}
if (uptoFirstAndLastLine) {
var firstLine = text.Lines.GetLineFromPosition (visibleSpan.Start);
var lastLine = text.Lines.GetLineFromPosition (visibleSpan.End);
if (firstLine.LineNumber < lastLine.LineNumber) {
start = (start < firstLine.End) ? start : firstLine.End;
end = (lastLine.Start < end + 1) ? end : lastLine.Start - 1;
}
}
return (start <= end) ? TextSpan.FromBounds (start, end + 1) : default (TextSpan);
}
private int GetAdditionalIndentation (SyntaxNode root, SourceText text, TextSpan span)
{
if (_hostType == HostType.HTML) {
return _workspace.Options.GetOption (FormattingOptions.IndentationSize, Language);
}
if (_hostType == HostType.Razor) {
var type = GetRazorCodeBlockType (span.Start);
// razor block
if (type == RazorCodeBlockType.Block) {
// more workaround for csharp razor case. when } for csharp razor code block is just typed, "}" exist
// in both subject and surface buffer and there is no easy way to figure out who owns } just typed.
// in this case, we let razor owns it. later razor will remove } from subject buffer if it is something
// razor owns.
if (Language == LanguageNames.CSharp) {
var textSpan = GetVisibleTextSpan (text, span);
var end = textSpan.End - 1;
if (end >= 0 && text [end] == '}') {
var token = root.FindToken (end);
var syntaxFact = _workspace.Services.GetLanguageServices (Language).GetService<ISyntaxFactsService> ();
if (token.Span.Start == end && syntaxFact != null) {
if (syntaxFact.TryGetCorrespondingOpenBrace (token, out var openBrace) && !textSpan.Contains (openBrace.Span)) {
return 0;
}
}
}
}
// same as C#, but different text is in the buffer
if (Language == LanguageNames.VisualBasic) {
var textSpan = GetVisibleTextSpan (text, span);
var subjectSnapshot = LanguageBuffer.CurrentSnapshot;
var end = textSpan.End - 1;
if (end >= 0) {
var ch = subjectSnapshot [end];
if (CheckCode (subjectSnapshot, textSpan.End, ch, VBRazorBlock, checkAt: false) ||
CheckCode (subjectSnapshot, textSpan.End, ch, FunctionsRazor, checkAt: false)) {
var token = root.FindToken (end, findInsideTrivia: true);
var syntaxFact = _workspace.Services.GetLanguageServices (Language).GetService<ISyntaxFactsService> ();
if (token.Span.End == textSpan.End && syntaxFact != null) {
if (syntaxFact.IsSkippedTokensTrivia (token.Parent)) {
return 0;
}
}
}
}
}
return _workspace.Options.GetOption (FormattingOptions.IndentationSize, Language);
}
}
return 0;
}
private RazorCodeBlockType GetRazorCodeBlockType (int position)
{
var subjectBuffer = (IProjectionBuffer)LanguageBuffer;
var subjectSnapshot = subjectBuffer.CurrentSnapshot;
var surfaceSnapshot = DataBuffer.CurrentSnapshot;
var surfacePoint = surfaceSnapshot.MapFromSourceSnapshot (new SnapshotPoint (subjectSnapshot, position), PositionAffinity.Predecessor);
if (!surfacePoint.HasValue) {
// how this can happen?
return RazorCodeBlockType.Implicit;
}
var ch = char.ToLower (surfaceSnapshot[Math.Max (surfacePoint.Value - 1, 0)]);
// razor block
if (IsCodeBlock (surfaceSnapshot, surfacePoint.Value, ch)) {
return RazorCodeBlockType.Block;
}
if (ch == RazorExplicit) {
return RazorCodeBlockType.Explicit;
}
if (CheckCode (surfaceSnapshot, surfacePoint.Value, HelperRazor)) {
return RazorCodeBlockType.Helper;
}
return RazorCodeBlockType.Implicit;
}
private bool IsCodeBlock (ITextSnapshot surfaceSnapshot, int position, char ch)
{
if (Language == LanguageNames.CSharp) {
return CheckCode (surfaceSnapshot, position, ch, CSharpRazorBlock) ||
CheckCode (surfaceSnapshot, position, ch, FunctionsRazor, CSharpRazorBlock) ||
CheckCode (surfaceSnapshot, position, ch, CodeRazor, CSharpRazorBlock);
}
if (Language == LanguageNames.VisualBasic) {
return CheckCode (surfaceSnapshot, position, ch, VBRazorBlock) ||
CheckCode (surfaceSnapshot, position, ch, FunctionsRazor);
}
return false;
}
private bool CheckCode (ITextSnapshot snapshot, int position, char ch, string tag, bool checkAt = true)
{
if (ch != tag [tag.Length - 1] || position < tag.Length) {
return false;
}
var start = position - tag.Length;
var razorTag = snapshot.GetText (start, tag.Length);
return string.Equals (razorTag, tag, StringComparison.OrdinalIgnoreCase) && (!checkAt || snapshot [start - 1] == RazorExplicit);
}
private bool CheckCode (ITextSnapshot snapshot, int position, string tag)
{
var i = position - 1;
if (i < 0) {
return false;
}
for (; i >= 0; i--) {
if (!char.IsWhiteSpace (snapshot [i])) {
break;
}
}
var ch = snapshot [i];
position = i + 1;
return CheckCode (snapshot, position, ch, tag);
}
private bool CheckCode (ITextSnapshot snapshot, int position, char ch, string tag1, string tag2)
{
if (!CheckCode (snapshot, position, ch, tag2, checkAt: false)) {
return false;
}
return CheckCode (snapshot, position - tag2.Length, tag1);
}
private enum RazorCodeBlockType
{
Block,
Explicit,
Implicit,
Helper
}
private enum HostType
{
HTML,
Razor,
XOML
}
}
}
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