private string LeadingWhitespaceFromInfo(LineCommentInfo info)
{
var leadingWhitespace = string.Empty;
if (info.MarkerSpan.Start > info.Line.Start)
{
// We no longer use the existing line as a template, because we
// should really be respecting the "add tabs as spaces" setting
// regardless of what the current line has. (Or, should that be
// an option the user can set?)
var convertTabs = this.view.Options.IsConvertTabsToSpacesEnabled();
if (convertTabs)
{
leadingWhitespace = new string(' ', info.MarkerColumnStart);
}
else
{
var tabSize = this.view.Options.GetTabSize();
leadingWhitespace = new string('\t', info.MarkerColumnStart / tabSize);
// Add spaces if the marker-start isn't a multiple of
// the tab size.
if (info.MarkerColumnStart % tabSize != 0)
{
leadingWhitespace = string.Concat(
leadingWhitespace,
new string(' ', info.MarkerColumnStart % tabSize));
}
}
}
return leadingWhitespace;
}
private IList<LineCommentInfo> GetMatchingComments(
ITextSnapshot snapshot,
LineCommentInfo toMatch,
int lineNumberStart,
int lineNumberLimit)
{
var list = new List<LineCommentInfo>();
var up = lineNumberLimit >= lineNumberStart;
var delta = up ? 1 : -1;
for (
var lineNumber = lineNumberStart;
up ? lineNumber < lineNumberLimit : lineNumber >= lineNumberLimit;
lineNumber += delta)
{
var line = snapshot.GetLineFromLineNumber(lineNumber);
var info = LineCommentInfo.FromLine(line, this.view.Options, this.classifier);
// TODO: treat lines with code (non-comment) as non-matching so
// that behavior is better?
if (!toMatch.Matches(info))
{
break;
}
list.Add(info);
}
if (!up)
{
list.Reverse();
}
return list;
}
/// <summary>
/// Returns whether another comment looks like it's a part of the same
/// block as the current one.
/// </summary>
/// <param name="other"></param>
/// <returns></returns>
public bool Matches(LineCommentInfo other)
{
if ((other != null) &&
(this.Style == other.Style) &&
(this.MarkerSpan.Length == other.MarkerSpan.Length) &&
// we *only* care about the start columns, not the position
// delta, because there may be mixed tabs and spaces.
////(this.MarkerSpan.Start - this.Line.Start == other.MarkerSpan.Start - other.Line.Start) &&
(this.MarkerColumnStart == other.MarkerColumnStart) &&
(this.ContentColumnStart == other.ContentColumnStart) &&
string.Equals(this.MarkerSpan.GetText(), other.MarkerSpan.GetText()))
{
// The leading info appears to match. If there's content in
// both, we also want to make sure it starts in the same column.
// If either line has blank content, should we consider it a
// match? (No, if we want to handle "paragraph breaks"...)
// Actually, just because of this, we require matching content
// starts. If it doesn't, we create a new line that *does*
// match, and all will be well.
if ((this.ContentSpan.IsEmpty == other.ContentSpan.IsEmpty) &&
(this.ContentSpan.Start - this.MarkerSpan.End == other.ContentSpan.Start - other.MarkerSpan.End))
{
return true;
}
}
return false;
}
private static bool ShouldWrap(
GeneralOptions options,
ITextChange change,
ITextSnapshotLine line,
LineCommentInfo info,
out int commentWrapLength)
{
commentWrapLength = -1;
if (info == null || (!info.CommentOnly && !options.CodeWrapEnabled))
{
return false;
}
// For now, we're only supporting single-line comments.
if (info.Style != CommentStyle.SingleLine)
{
return false;
}
// If we just typed whitespace at the *end* of the line, don't do
// any wrapping yet. (It will cause us to trim the trailing space,
// which would makeeverythingruntogetherlikethis! It also makes
// newline handling weird.)
if ((change.Delta > 0) &&
((change.NewSpan.End >= line.End) && (change.NewSpan.End <= line.EndIncludingLineBreak)) &&
change.NewText.All(c => Whitespace.Contains(c)))
{
return false;
}
commentWrapLength = options.AutoWrapColumn - info.ContentColumnStart;
// There's some minimum length after which wrapping becomes
// pointless...
if (commentWrapLength < options.MinimumWrapWidth)
{
return false;
}
return true;
}
public static LineCommentInfo FromLine(ITextSnapshotLine line, IEditorOptions options, IClassifier classifier)
{
// Check if the line ends with a comment...
var spans = classifier.GetClassificationSpans(line.Extent);
// If there are no spans, or the last span isn't a comment
// (multi-line issues?) return no info.
var span = (spans != null) ? spans.LastOrDefault() : null;
if (span == null ||
!span.ClassificationType.IsOfType("comment"))
{
return null;
}
var info = new LineCommentInfo(line, spans, span.Span, options);
return info;
}