private static bool DeleteHorizontalWhitespace()

in src/Editor/Text/Impl/EditorOperations/EditorOperations.cs [4008:4069]
49 lines of code
20 McCabe index (conditional complexity)

        private static bool DeleteHorizontalWhitespace(ITextEdit textEdit, ICollection<Span> largeSpansToDelete, ICollection<Span> singleSpansToDelete, ICollection<Span> singleTabsToReplace)
        {
            ITextSnapshot snapshot = textEdit.Snapshot;
            Func<int, bool> isLeadingWhitespace = (p) => snapshot.GetLineFromPosition(p).Start == p;
            Func<int, bool> isTrailingWhitespace = (p) => snapshot.GetLineFromPosition(p).End == p;

            if (largeSpansToDelete.Count == 0)
            {
                // If there were no spans of more than one space or tab,
                // then delete all spans of just a single space or tab
                foreach (var span in singleSpansToDelete)
                {
                    if (!textEdit.Delete(span))
                        return false;
                }
            }
            else
            {
                // If there was at least one span of more than one space or
                // tab then replace all of those spans with spaces
                foreach (var span in largeSpansToDelete)
                {
                    // if it is leading or trailing whitespace, just delete it
                    if (isLeadingWhitespace(span.Start) || isTrailingWhitespace(span.End))
                    {
                        if (!textEdit.Delete(span))
                            return false;
                    }
                    // if there's space adjacent to the beginning/end of the selection
                    else if (IsSpaceCharacter(snapshot[span.Start - 1]) || IsSpaceCharacter(snapshot[span.End]))
                    {
                        if (!textEdit.Delete(span))
                            return false;
                    }
                    else if (!textEdit.Replace(span, " "))
                        return false;
                }

                // Replace single tabs with a single space, but
                // skip leading / trailing tabs since they will be deleted below by the singleSpansToDelete loop.
                foreach (var span in singleTabsToReplace)
                {
                    if (!isLeadingWhitespace(span.Start) && !isTrailingWhitespace(span.End))
                    {
                        if (!textEdit.Replace(span, " "))
                            return false;
                    }
                }

                // Delete leading or trailing whitespace in singleSpansToDelete
                foreach (var span in singleSpansToDelete)
                {
                    if (isLeadingWhitespace(span.Start) || isTrailingWhitespace(span.End))
                    {
                        if (!textEdit.Delete(span))
                            return false;
                    }
                }
            }

            return true;
        }