System.Collections.Generic.IEnumerable.Take(int)

[RCEndpoint(true, "/userinfos", "?from={first}&count={count}", "?from=0&count=100", "User Infos", "Get some basic information about ALL users.")]
        public static void UserInfos(Frontend f, HttpRequestEventArgs c) {
            using UserDataBatchContext ctx = f.Server.UserData.OpenBatch();

            string[] uids = f.Server.UserData.GetAll();

            NameValueCollection args = f.ParseQueryString(c.Request.RawUrl);
            if (!int.TryParse(args["from"], out int from) || from <= 0)
                from = 0;
            if (!int.TryParse(args["count"], out int count) || count <= 0)
                count = 100;
            if (from + count > uids.Length)
                count = uids.Length - from;

            f.RespondJSON(c, uids.Skip(from).Take(count).Select(uid => {
                BasicUserInfo info = f.Server.UserData.Load<BasicUserInfo>(uid);
                BanInfo ban = f.Server.UserData.Load<BanInfo>(uid);
                KickHistory kicks = f.Server.UserData.Load<KickHistory>(uid);
                return new {
                    UID = uid,
                    info.Name,
                    info.Discrim,
                    info.Tags,
                    Key = f.Server.UserData.GetKey(uid),
                    Ban = ban.Reason.IsNullOrEmpty() ? null : new {
                        ban.Name,
                        ban.Reason,
                        From = ban.From?.ToUnixTime() ?? 0,
                        To = ban.To?.ToUnixTime() ?? 0
                    },
                    Kicks = kicks.Log.Select(e => new {
                        e.Reason,
                        From = e.From?.ToUnixTime() ?? 0
                    }).ToArray()
                };
            }).ToArray());
        }

public static DirectoryStructure BuildStructure(IEnumerable<StoredFile> files)
        {
            var dirStructure = new DirectoryStructure
            {
                Path = "/"
            };
            foreach (var file in files)
            {
                var pathSegments = GetPathSegments(file.ParentDirPath);
                var targetPathSegmentCount = pathSegments.Length;
                var parent = dirStructure;
                for (int i = 0; i < targetPathSegmentCount; i++)
                {
                    var currentSegment = pathSegments[i];
                    var currentFullPath = JoinPathSegments(pathSegments.Take(i + 1).ToArray());
                    DirectoryStructure nextChild;
                    var existingChild = parent.SubDirectories.Where(x => x.Path == currentFullPath).FirstOrDefault();
                    if (existingChild != null)
                    {
                        nextChild = existingChild;
                    }
                    else
                    {
                        // Create and add next directory
                        nextChild = new DirectoryStructure
                        {
                            Name = currentSegment,
                            Path = parent.Path + currentSegment + "/"
                        };
                        parent.SubDirectories.Add(nextChild);
                    }
                    parent = nextChild;
                }
                parent.Files.Add(file);
            }
            return dirStructure;
        }

public override int Read( byte[] buffer, int offset, int count)
        {
            if (Position == inputStream.Length)
                return 0;

            var positionInSector = Position % sectorSize;
            var resultCount = 0;
            if (positionInSector > 0)
            {
                var len = (int)Math.Min(Math.Min(count, sectorSize - positionInSector), inputStream.Position - Position);
                md5.TransformBlock(bufferedSector, (int)positionInSector, len, buffer, offset);
                sha1.TransformBlock(bufferedSector, (int)positionInSector, len, buffer, offset);
                sha256.TransformBlock(bufferedSector, (int)positionInSector, len, buffer, offset);
                offset += len;
                count -= len;
                resultCount += len;
                Position += len;
                if (Position % sectorSize == 0)
                    SectorPosition++;
            }
            if (Position == inputStream.Length)
                return resultCount;

            int readCount;
            do
            {
                readCount = inputStream.ReadExact(tmpSector, 0, sectorSize);
                if (readCount < sectorSize)
                    Array.Clear(tmpSector, readCount, sectorSize - readCount);
                var decryptedSector = tmpSector;
                if (IsEncrypted(SectorPosition))
                {
                    WasEncrypted = true;
                    if (readCount % 16 != 0)
                    {
                        Log.Debug($"Block has only {(readCount % 16) * 8} bits of data, reading raw sector...");
                        discStream.Seek(SectorPosition * sectorSize, SeekOrigin.Begin);
                        var newTmpSector = new byte[sectorSize];
                        discStream.ReadExact(newTmpSector, 0, sectorSize);
                        if (!newTmpSector.Take(readCount).SequenceEqual(tmpSector.Take(readCount)))
                            Log.Warn($"Filesystem data and raw data do not match for sector 0x{SectorPosition:x8}");
                        tmpSector = newTmpSector;
                    }
                    using var aesTransform = aes.CreateDecryptor(decryptionKey, GetSectorIV(SectorPosition));
                    decryptedSector = aesTransform.TransformFinalBlock(tmpSector, 0, sectorSize);
                }
                else
                    WasUnprotected = true;
                if (count >= readCount)
                {
                    md5.TransformBlock(decryptedSector, 0, readCount, buffer, offset);
                    sha1.TransformBlock(decryptedSector, 0, readCount, buffer, offset);
                    sha256.TransformBlock(decryptedSector, 0, readCount, buffer, offset);
                    offset += readCount;
                    count -= readCount;
                    resultCount += readCount;
                    Position += readCount;
                    SectorPosition++;
                }
                else // partial sector read
                {
                    Buffer.BlockCopy(decryptedSector, 0, bufferedSector, 0, sectorSize);
                    md5.TransformBlock(decryptedSector, 0, count, buffer, offset);
                    sha1.TransformBlock(decryptedSector, 0, count, buffer, offset);
                    sha256.TransformBlock(decryptedSector, 0, count, buffer, offset);
                    offset += count;
                    count = 0;
                    resultCount += count;
                    Position += count;
                }
            } while (count > 0 && readCount == sectorSize);
            return resultCount;
        }

private static TypeSyntax GenerateType(Type type)
        {
            if (!type.IsGenericType)
                return GenerateQualifiedNameSyntax(type);


            var list = new List<SyntaxNodeOrToken>();
            foreach (var genericType in type.GetGenericArguments())
            {
                list.Add(genericType.IsGenericType ? GenerateType(genericType) : GenerateQualifiedNameSyntax(genericType.FullName));
                list.Add(SyntaxFactory.Token(SyntaxKind.CommaToken));
            }
            var typeArgumentList = SyntaxFactory.TypeArgumentList(SyntaxFactory.SeparatedList<TypeSyntax>(list.Take(list.Count - 1)));
            //if (type.Namespace == typeof(Task).Namespace)
            return SyntaxFactory.GenericName(type.Name.Substring(0, type.Name.IndexOf('`'))).WithTypeArgumentList(typeArgumentList);
            //return SyntaxFactory.GenericName(type.FullName?.Substring(0, type.FullName.IndexOf('`'))).WithTypeArgumentList(typeArgumentList);
        }

private IList<RedisKey> GetKeys(string prefix = null, int pageSize = 10, int pageOffset = 0)
    {
        var pat = prefix.IsNull() ? null : $"{GetKey(prefix)}*";
        var endPoints = _redis.GetEndPoints();
        if (endPoints.Length > 1)
        {
            var skipNum = pageOffset * pageSize;
            var leftNum = skipNum + pageSize;
            var keys = new List<RedisKey>();
            foreach (var endPoint in endPoints)
            {
                if (leftNum > 0)
                {
                    foreach (var key in _redis.GetServer(endPoint).Keys(_dbIndex, pat, pageSize: leftNum))
                    {
                        if (keys.Any(m => m == key))
                        {
                            continue;
                        }
                        keys.Add(key);
                        leftNum--;
                    }
                }
            }
            return keys.Skip(pageSize * pageOffset).Take(pageSize).ToList();
        }
        else
        {
            return _redis.GetServer(_redis.GetEndPoints().FirstOrDefault()).Keys(_dbIndex, pat, pageSize: pageSize, pageOffset: pageOffset).ToList();
        }
    }

public static string GetCode(params object[] code)
        {
            string asmcode = "";

            for (int i = 0; i < code.Length; i++)
            {
                if (!(code[i] is ASM))
                    if (!(code[i] is int))
                        if (!(code[i] is REG))
                            if (!(code[i] is MEM))
                                if (!(code[i] is string))
                                    if (!(code[i] is Label))
                                        if (!(code[i] is RawreplacedemblyCode))
                                            throw new ArrayTypeMismatchException("Not supported type");

                var cnt = InstructionPattern.CheckPattern(code, i);
                if (cnt < 0)
                    throw new FormatException("Format error");
                asmcode += $"{FromInline(code.Skip(i).Take(cnt + 1).ToArray())}\n";
                i += cnt;
            }

            return asmcode;
        }

private void ButtonRestoreViewport_Click(object sender, RoutedEventArgs e)
		{
			string[] scoords = Properties.Settings.Default.ViewPortPos.Split(';');

			try
			{
				IEnumerable<double> coords = scoords.Select(s => double.Parse(s));

				viewport.Camera.Position = new Vector3(coords.Take(3).ToArray()).ToPoint3D();
				viewport.Camera.LookDirection = new Vector3(coords.Skip(3).ToArray()).ToVector3D();
				viewport.Camera.UpDirection = new System.Windows.Media.Media3D.Vector3D(0, 0, 1);
			}
			catch
			{
				ButtonResetViewport_Click(null, null);
			}
		}

public WorkbookStream ReplaceRecord(BiffRecord oldRecord, BiffRecord newRecord)
        {
            if (ContainsRecord(oldRecord) == false)
            {
                throw new ArgumentException("Could not find oldRecord");
            }

            //records [r1, OLD, r2, r3, r4, r5]
            //records.count = 6
            //replaceRecordOffset = 1
            //records.Take(1) = [r1]
            //records.TakeLast(4) = [r2, r3, r4, r5]
            //output = [r1, NEW, r2, r3, r4, r5]

            var replaceRecordOffset = GetRecordOffset(oldRecord);

            var newRecords = _biffRecords.Take(replaceRecordOffset).Append(newRecord)
                .Concat(_biffRecords.TakeLast(_biffRecords.Count - (replaceRecordOffset + 1))).ToList();

            return new WorkbookStream(newRecords);
        }

public long GetRecordByteOffset(BiffRecord record)
        {
            int listOffset = GetRecordOffset(record);
            //Size of BiffRecord is 4 (header) + Length
            return _biffRecords.Take(listOffset).Sum(r => r.Length + 4);
        }

public static List<string> BuildBase64PayloadMacros(byte[] shellcode)
        {
            List<string> base64Strings = new List<string>(); 
            //Base64 expansion is 4/3, and we have 252 bytes to spend, so we can have 189 bytes / cell
            //As an added bonus, 189 is always divisible by 3, so we won't have == padding.
            int maxBytesPerCell = 189;
            for (int offset = 0; offset < shellcode.Length; offset += maxBytesPerCell)
            {
                byte[] guidShellcode;
                if (shellcode.Length - offset < maxBytesPerCell)
                {
                    guidShellcode = shellcode.Skip(offset).ToArray();
                }
                else
                {
                    guidShellcode = shellcode.Skip(offset).Take(maxBytesPerCell).ToArray();
                }
                base64Strings.Add(Convert.ToBase64String(guidShellcode));
            }
            base64Strings.Add("END");
            return base64Strings;
        }

public static string ConvertA1StringToR1C1String(string cellFormula)
        {
            //Remap A1 style references to R1C1 (but ignore anything followed by a " in case its inside an EVALUATE statement)
            string a1pattern = @"([A-Z]{1,2}\d{1,5})";
            Regex rg = new Regex(a1pattern);
            MatchCollection matches = rg.Matches(cellFormula);
            int stringLenChange = 0;

            //Iterate through each match and then replace it at its offset. We iterate through 
            //each case manually to prevent overlapping cases from double replacing - ex: SELECT(B1:B111,B1)
            foreach (var match in matches)
            {
                string matchString = ((Match)match).Value;
                string replaceContent = ExcelHelperClreplaced.ConvertA1ToR1C1(matchString);
                //As we change the string, these indexes will go out of sync, track the size delta to make sure we resync positions
                int matchIndex = ((Match)match).Index + stringLenChange;

                //If the match is followed by a ", then ignore it
                int followingIndex = matchIndex + matchString.Length;
                if (followingIndex < cellFormula.Length && cellFormula[followingIndex] == '"')
                {
                    continue;
                }

                //LINQ replacement for python string slicing
                cellFormula = new string(cellFormula.Take(matchIndex).
                    Concat(replaceContent.ToArray()).
                    Concat(cellFormula.TakeLast(cellFormula.Length - matchIndex - matchString.Length)).ToArray());

                stringLenChange += (replaceContent.Length - matchString.Length);
            }

            return cellFormula;
        }

private static string ImportCellFormula(string cellFormula)
        {
            if (cellFormula.Length == 0) return cellFormula;

            string newCellFormula = cellFormula;

            //Unescape the "s if we are looking at a CellFormula that has been escaped
            if (newCellFormula.StartsWith('"'))
            {
                //Strip the outer quotes
                newCellFormula = new string(newCellFormula.Skip(1).Take(newCellFormula.Length - 2).ToArray());

                //Escape the inside content
                newCellFormula = ExcelHelperClreplaced.UnescapeFormulaString(newCellFormula);
            }

            //Replace any uses of SELECT and ACTIVE.CELL with variable usage to better enable the sheet being hidden
            //Mainly for use with importing EXCELntDonut macros
            newCellFormula = ReplaceSelectActiveCellFormula(newCellFormula);

            //FORMULA requires R1C1 strings
            newCellFormula = ConvertA1StringToR1C1String(newCellFormula);

            int charReplacements = 0;
            //Remap CHAR() to actual bytes
            for (int i = 1; i <= 255; i += 1)
            {
                int oldLength = newCellFormula.Length;
                newCellFormula = newCellFormula.Replace(string.Format("CHAR({0})&", i), "" + (char) i);
                newCellFormula = newCellFormula.Replace(string.Format("CHAR({0})", i), "" + (char)i);

                //Update our poor heuristic for when we're getting a cell that is just CHAR()&CHAR()&CHAR()&CHAR()...
                if (oldLength != newCellFormula.Length)
                {
                    double lengthDelta = oldLength - newCellFormula.Length;
                    charReplacements += (int)Math.Floor(lengthDelta / 6.0);
                }
            }
            
            //Arbitrary metric to determine if we should convert this to a string cell vs. formula cell
            if (charReplacements > 3 && newCellFormula[0] == '=')
            {
                newCellFormula = new string(newCellFormula.Skip(1).ToArray());

                //Excel cells will also check to see if we are a variable replacedignment cell:
                //if we have valid variable letters before an =, it will process the replacedignment value
                bool looksLikeVariablereplacedignment = LooksLikeVariablereplacedignment(newCellFormula);

                //If we have a raw string content that starts with = or @, we can wrap this with ="" and it will work
                //If the string content is already 255 bytes though, this won't work (FORMULA will fail trying to write the 258 byte string)
                //If we're close to the limit then populate the cell with =CHAR(w/e)&Ref to cell with remainder of the content
                if (newCellFormula.StartsWith('=') || newCellFormula.StartsWith('@') || looksLikeVariablereplacedignment)
                {
                    //Need to make sure there's room for inserting 3 more characters =""
                    if (newCellFormula.Length >= 255 - 3)
                    {
                        //If this is a max length cell (common with 255 byte increments of shellcode)
                        //then mark the macro with a marker and we'll break it into two cells when we're building the sheet
                        return FormulaHelper.TOOLONGMARKER + newCellFormula;
                    }
                    else
                    {
                        newCellFormula = string.Format("=\"{0}\"", newCellFormula);
                    }
                    
                }
            }
            else
            {
                //TODO Use a proper logging package and log this as DEBUG info
                // Console.WriteLine(newCellFormula);
            }

            if (newCellFormula.Length > 255)
            {
                throw new ArgumentException(string.Format("Imported Cell Formula is too long - length must be 255 or less:\n{0}", newCellFormula));
            }


            return newCellFormula;
        }

public static List<String> SplitStringIntoChunks(this string str, int maxChunkSize)
        {
            List<string> chunks = new List<string>();

            for (int offset = 0; offset < str.Length; offset += maxChunkSize)
            {
                int bytesRemaining = str.Length - offset;
                int chunkSize = maxChunkSize;
                if (chunkSize > bytesRemaining)
                {
                    chunkSize = bytesRemaining;
                }

                chunks.Add(new string(str.Skip(offset).Take(chunkSize).ToArray()));
            }

            return chunks;
        }

public List<BiffRecord> GetRecordsForBOFRecord(BOF sheetBeginRecord)
        {
            var sheetRecords = _biffRecords.SkipWhile(r => r.Equals(sheetBeginRecord) == false).ToList();

            int sheetSize = sheetRecords.TakeWhile(r => r.Id != RecordType.EOF).Count() + 1;

            return sheetRecords.Take(sheetSize).ToList();
        }

public WorkbookStream RemoveRecord(BiffRecord recordToRemove)
        {
            if (ContainsRecord(recordToRemove) == false)
            {
                throw new ArgumentException("Could not find recordToRemove");
            }

            var removeRecordOffset = GetRecordOffset(recordToRemove);

            var newRecords = _biffRecords.Take(removeRecordOffset).Concat(
                _biffRecords.TakeLast(_biffRecords.Count - removeRecordOffset - 1)).ToList();

            return new WorkbookStream(newRecords);
        }

public WorkbookStream InsertRecords(List<BiffRecord> recordsToInsert, BiffRecord insertAfterRecord = null)
        {
            if (insertAfterRecord == null)
            {
                List<BiffRecord> recordsWithAppendedRecord = _biffRecords.Concat(recordsToInsert).ToList();
                return new WorkbookStream(recordsWithAppendedRecord);
            }

            if (ContainsRecord(insertAfterRecord) == false)
            {
                throw new ArgumentException("Could not find insertAfterRecord");
            }

            var insertRecordOffset = GetRecordOffset(insertAfterRecord) + 1;

            //records [r1, TARGET, r2, r3, r4, r5]
            //records.count = 6
            //insertRecordOffset = 2
            //records.Take(2) = [r1, TARGET]
            //records.TakeLast(4) = [r2, r3, r4, r5]
            //output = [r1, TARGET, INSERT, r2, r3, r4, r5]

            var newRecords = _biffRecords.Take(insertRecordOffset).Concat(recordsToInsert)
                .Concat(_biffRecords.TakeLast(_biffRecords.Count - insertRecordOffset)).ToList();

            return new WorkbookStream(newRecords);
        }

public static List<BiffRecord> ConvertMaxLengthStringToFormulas(string curString, int rwStart, int colStart, int dstRw, int dstCol, int ixfe = 15, SheetPackingMethod packingMethod = SheetPackingMethod.ObfuscatedCharFunc)
        {
            string actualString =
                new string(curString.Skip(FormulaHelper.TOOLONGMARKER.Length).ToArray());

            string earlyString = new string(actualString.Take(16).ToArray());
            string remainingString = new string(actualString.Skip(16).ToArray());
            List<BiffRecord> formulas = new List<BiffRecord>();

            int curRow = rwStart;
            int curCol = colStart;


            Random r = new Random();
            int rndCol = r.Next(0x90, 0x9F);
            int rndRw = r.Next(0xF000, 0xF800);
            formulas.AddRange(ConvertStringToFormulas(remainingString, curRow, curCol, rndRw, rndCol, ixfe, packingMethod));

            curRow += formulas.Count;

            Cell remainderCell = new Cell(rndRw, rndCol);
            List<Cell> createdCells = new List<Cell>();

            //Create a formula string like 
            //"=CHAR(123)&CHAR(234)&CHAR(345)&R[RandomRw]C[RandomCol]";
            //To split the 255 bytes into multiple cells - the first few bytes are CHAR() encoded, the remaining can be wrapped in ""s
            string macroString = "=";

            foreach (char c in earlyString)
            {
                macroString += string.Format("CHAR({0})&", Convert.ToUInt16(c));
            }
            macroString += string.Format("R{0}C{1}",rndRw + 1, rndCol + 1);
            createdCells.Add(remainderCell);

            List<BiffRecord> mainFormula = ConvertStringToFormulas(macroString, curRow, curCol, dstRw, dstCol, ixfe, packingMethod);
            formulas.AddRange(mainFormula);

            return formulas;
        }

static bool CamelCaseMatch(string text, string query)
		{
			// We take the first letter of the text regardless of whether or not it's upper case so we match
			// against camelCase text as well as PascalCase text ("cct" matches "camelCaseText")
			var theFirstLetterOfEachWord = text.Take(1).Concat(text.Skip(1).Where(char.IsUpper));

			int i = 0;
			foreach (var letter in theFirstLetterOfEachWord) {
				if (i > query.Length - 1)
					return true;    // return true here for CamelCase partial match ("CQ" matches "CodeQualityreplacedysis")
				if (char.ToUpperInvariant(query[i]) != char.ToUpperInvariant(letter))
					return false;
				i++;
			}
			if (i >= query.Length)
				return true;
			return false;
		}

async Task HandleAsync(IConn conn) {
            try {
                using (conn) {
                    var req = await conn.Read(5.Sec());

                    switch (req) {
                        case DownloadRequest dr:
                            await conn.Write(_stored.Skip((int)dr.From).Take(dr.Count).ToList());
                            return;
                        case CommitRequest cr:
                            await _env.SimulateWork(5.Ms());

                            foreach (var e in cr.Events) {
                                _buffer.Enqueue(e);    
                            }

                            
                            ScheduleStore();
                            await conn.Write("OK");
                            return;
                        default:
                            conn.Write($"Unknown request {req}");
                            return;
                    }
                }
            } catch (Exception ex) {
                _env.Debug($"Error: {ex.Message}");
            }
        }

public static void CalculateJointRotations(Handedness handedness, Vector3[] jointPositions, Quaternion[] jointOrientationsOut)
        {
            const int numFingers = 5;
            int[] jointsPerFinger = { 4, 5, 5, 5, 5 }; // thumb, index, middle, right, pinky

            for (int fingerIndex = 0; fingerIndex < numFingers; fingerIndex++)
            {
                int jointsCurrentFinger = jointsPerFinger[fingerIndex];
                int lowIndex = (int)TrackedHandJoint.ThumbMetacarpalJoint + jointsPerFinger.Take(fingerIndex).Sum();
                int highIndex = lowIndex + jointsCurrentFinger - 1;

                for (int jointStartidx = lowIndex; jointStartidx <= highIndex; jointStartidx++)
                {
                    // If we are at the lowIndex (metacarpals) use the wrist as the previous joint.
                    int jointEndidx = jointStartidx == lowIndex ? (int)TrackedHandJoint.Wrist : jointStartidx - 1;
                    Vector3 boneForward = jointPositions[jointStartidx] - jointPositions[jointEndidx];
                    Vector3 boneUp = Vector3.Cross(boneForward, GetPalmRightVector(handedness, jointPositions));
                    if (boneForward.magnitude > float.Epsilon && boneUp.magnitude > float.Epsilon)
                    {
                        Quaternion jointRotation = Quaternion.LookRotation(boneForward, boneUp);
                        // If we are the thumb, set the up vector to be from pinky to index (right hand) or index to pinky (left hand).
                        if (fingerIndex == 0)
                        {
                            // Rotate the thumb by 90 degrees (-90 if left hand) about thumb forward vector.
                            Quaternion rotateThumb90 = Quaternion.AngleAxis(handedness == Handedness.Left ? -90 : 90, boneForward);
                            jointRotation = rotateThumb90 * jointRotation;
                        }
                        jointOrientationsOut[jointStartidx] = jointRotation;
                    }
                    else
                    {
                        jointOrientationsOut[jointStartidx] = Quaternion.idenreplacedy;
                    }
                }
            }
            jointOrientationsOut[(int)TrackedHandJoint.Palm] = Quaternion.LookRotation(GetPalmForwardVector(jointPositions), GetPalmUpVector(handedness, jointPositions));
        }

public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (MainWindowViewModel.SearchText.IsNullOrEmpty())
            {
                return string.Empty;
            }

            var description = (string)value;
            var result = string.Empty;

            var terms = MainWindowViewModel.SearchText.Split(' ').Where(word => word != "").Select(x => x.ToLower()).ToArray();

            var lines = description.Split(new[] { ". " }, StringSplitOptions.None).ToArray();

            var sentences = new HashSet<string>();
            foreach (var term in terms)
            {
                var containsTerm = lines.Where(x => x != "" && x.ToLower().Contains(term));
                containsTerm.Take(2).ForEachDo(x => sentences.Add(x));
            }

            if (sentences.Any())
            {
                result = HighlightText(sentences.Select(x => x.Trim()).ToArray(), terms);
            }
            else
            {
                foreach (string sentence in lines.Take(2).Select(x => x.Trim()))
                {
                    result = result + (sentence + ". ");
                }
            }

            return result;
        }

public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (MainWindowViewModel.SearchText.IsNullOrEmpty())
            {
                return string.Empty;
            }

            var terms = MainWindowViewModel.SearchText.Split(' ').Where(word => word != "").Select(x => x.ToLower()).ToArray();
            var codeFiles = (Dictionary<string, string>) value;

            var uiCodeFiles = codeFiles.Where(x => x.Key.EndsWith(".xaml"));

            var lines = new List<string>();
            foreach (var file in uiCodeFiles)
            {
                lines.AddRange(file.Value.Split(new[] {"\r\n"}, StringSplitOptions.None));
            }

            var toHighlight = new HashSet<string>();
            foreach (var term in terms)
            {
                var containsTerm = lines.Where(x => x != "" && x.ToLower().Contains(term));
                containsTerm.Take(2).Select(x => x.Trim()).ForEachDo(x => toHighlight.Add(x));
            }

            string result;

            if (toHighlight.Any())
            {
                lines = toHighlight.Take(2).Select(x => x.Trim().Replace('<', ' ').Replace('>', ' ') + '.').ToList();
                result = HighlightText(lines, terms);
            }
            else
            {
                var sentences = lines.Take(2).Select(x => string.Format("... {0} ...", x.Trim().Replace('<', ' ').Replace('>', ' ').ToList()));
                result = string.Join("\n", sentences);
            }

            return result;
        }

private void AddMoreItems()
        {
            var isBusy = (bool)GetValue(IsBusyProperty);
            if (!isBusy)
            {
                SetValue(IsBusyProperty, true);
                SetValue(IsBusyProperty, false);
                SetValue(IsBusyProperty, true);
                var delay = (TimeSpan)GetValue(PreLoadingDelayProperty);
                
                Task.Factory.StartNew(() =>
                {
                    Thread.Sleep(delay);

                    var items = _allItems.Take(10).ToList();
                    items.ForEach(item =>
                    {
                        Dispatcher.BeginInvoke(new Action(() => Currenreplacedems.Add(item)));
                        _allItems.Remove(item);
                    });
                }).ContinueWith(_ =>
                {
                    Dispatcher.BeginInvoke(new Action(() => SetValue(IsBusyProperty, false)));
                });
            }
        }

private void RefhrereplacedemsSource(List<object> newItems)
        {
            var startCapacity = (int)GetValue(StartCapacityProperty);

            _allItems = newItems;
            Currenreplacedems = new ObservableCollection<object>(_allItems.Take(startCapacity));
            _allItems.Take(startCapacity).ToList().ForEach(item => _allItems.Remove(item));

            var binding = new Binding
            {
                Path = new PropertyPath("Currenreplacedems"),
                Source = this,
                Mode = BindingMode.TwoWay,
                UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged,
            };
            SetBinding(ItemsSourceProperty, binding);
        }

public void ReadData(Stream stream)
        {
            var binaryWriter = new BinaryWriter(stream);

            binaryWriter.Write(System.Text.Encoding.ASCII.GetBytes("RIFF"));

            uint filesize = (uint)(Data.Length + 36); // 36 is added for all the extra we're adding for the WAV header format
            binaryWriter.Write(filesize);

            binaryWriter.Write(System.Text.Encoding.ASCII.GetBytes("WAVE"));

            binaryWriter.Write(System.Text.Encoding.ASCII.GetBytes("fmt"));
            binaryWriter.Write((byte)0x20); // Null ending to the fmt

            binaryWriter.Write((int)0x10); // 16 ... length of all the above

            // AC audio headers start at Format Type,
            // and are usually 18 bytes, with some exceptions
            // notably objectID A000393 which is 30 bytes

            // WAV headers are always 16 bytes from Format Type to end of header,
            // so this extra data is truncated here.
            binaryWriter.Write(Header.Take(16).ToArray());

            binaryWriter.Write(System.Text.Encoding.ASCII.GetBytes("data"));
            binaryWriter.Write((uint)Data.Length);
            binaryWriter.Write(Data);
        }

public void AddCell(List<LandVertex> vertices, int polyIdx)
        {
            Vertices.AddRange(vertices.Skip(polyIdx * 3).Take(6));
        }

[Fact]
		public void CheckSuppressionMessageConversion_FromXml()
		{
			var xElement = GetXElementsToCheck().Take(1).Single();
			var target = xElement.Element("target").Value;
			var syntaxNode = xElement.Element("syntaxNode").Value;

			var messageToCheck = SuppressMessage.MessageFromElement(xElement);

			messageToCheck.Should().NotBeNull();
			messageToCheck.Value.Id.Should().Be(xElement.Attribute("id").Value);
			messageToCheck.Value.Target.Should().Be(target);
			messageToCheck.Value.SyntaxNode.Should().Be(syntaxNode);
		}

[Fact]
		public void CheckSuppressionMessageConversion_ToXml()
		{
			var expectedXElement = GetXElementsToCheck().Take(1).Single();
			var message = new SuppressMessage(id: "PX1001",
											  target: @"PX.Objects.CS.Email.ExchangeBaseLogicSyncCommand<GraphType, TPrimary, ExchangeType>.Uploader",
											  syntaxNode: @"new UploadFileMaintenance()");

			var xElement = message.ToXml();

			xElement.Should().NotBeNull();
			xElement.Should().Be(expectedXElement);	
		}

public static List<List<T>> SplitList<T>(List<T> list, int length)
        {
            if (list == null || list.Count <= 0 || length <= 0)
            {
                return new List<List<T>>();
            }

            var result = new List<List<T>>();
            var count = list.Count / length;
            count += list.Count % length > 0 ? 1 : 0;
            for (var i = 0; i < count; i++)
            {
                result.Add(list.Skip(i * length).Take(length).ToList());
            }
            return result;
        }

public Version GetVersion(string tagPrefix, VersionPart autoIncrement, string defaultPreReleasePhase, ILogger log)
        {
            var commit = this.head;

            if (commit == null)
            {
                var version = new Version(defaultPreReleasePhase);

                log.Info($"No commits found. Using default version {version}.");

                return version;
            }

            var tagsAndVersions = this.tags
                .Select(tag => (tag, Version.ParseOrDefault(tag.Name, tagPrefix)))
                .OrderBy(tagAndVersion => tagAndVersion.Item2)
                .ThenBy(tagsAndVersion => tagsAndVersion.tag.Name)
                .ToList();

            var commitsChecked = new HashSet<string>();
            var count = 0;
            var height = 0;
            var candidates = new List<Candidate>();
            var commitsToCheck = new Stack<(Commit, int, Commit)>();
            Commit previousCommit = null;

            if (log.IsTraceEnabled)
            {
                log.Trace($"Starting at commit {commit.ShortSha} (height {height})...");
            }

            while (true)
            {
                var parentCount = 0;

                if (commitsChecked.Add(commit.Sha))
                {
                    ++count;

                    var commitTagsAndVersions = tagsAndVersions.Where(tagAndVersion => tagAndVersion.tag.Sha == commit.Sha).ToList();
                    var foundVersion = false;

                    foreach (var (tag, commitVersion) in commitTagsAndVersions)
                    {
                        var candidate = new Candidate { Commit = commit, Height = height, Tag = tag.Name, Version = commitVersion, Index = candidates.Count };

                        foundVersion = foundVersion || candidate.Version != null;

                        if (log.IsTraceEnabled)
                        {
                            log.Trace($"Found {(candidate.Version == null ? "non-" : null)}version tag {candidate}.");
                        }

                        candidates.Add(candidate);
                    }

                    if (!foundVersion)
                    {
                        if (log.IsTraceEnabled)
                        {
                            var parentIndex = 0;
                            Commit firstParent = null;

                            foreach (var parent in commit.Parents)
                            {
                                switch (parentIndex)
                                {
                                    case 0:
                                        firstParent = parent;
                                        break;
                                    case 1:
                                        log.Trace($"History diverges from {commit.ShortSha} (height {height}) to:");
                                        log.Trace($"- {firstParent.ShortSha} (height {height + 1})");
                                        goto default;
                                    default:
                                        log.Trace($"- {parent.ShortSha} (height {height + 1})");
                                        break;
                                }

                                ++parentIndex;
                                parentCount = parentIndex;
                            }
                        }

                        foreach (var parent in ((IEnumerable<Commit>)commit.Parents).Reverse())
                        {
                            commitsToCheck.Push((parent, height + 1, commit));
                        }

                        if (commitsToCheck.Count == 0 || commitsToCheck.Peek().Item2 <= height)
                        {
                            var candidate = new Candidate { Commit = commit, Height = height, Tag = null, Version = new Version(defaultPreReleasePhase), Index = candidates.Count };

                            if (log.IsTraceEnabled)
                            {
                                log.Trace($"Found root commit {candidate}.");
                            }

                            candidates.Add(candidate);
                        }
                    }
                }
                else
                {
                    if (log.IsTraceEnabled)
                    {
                        log.Trace($"History converges from {previousCommit.ShortSha} (height {height - 1}) back to previously seen commit {commit.ShortSha} (height {height}). Abandoning path.");
                    }
                }

                if (commitsToCheck.Count == 0)
                {
                    break;
                }

                if (log.IsTraceEnabled)
                {
                    previousCommit = commit;
                }

                var oldHeight = height;
                Commit child;
                (commit, height, child) = commitsToCheck.Pop();

                if (log.IsTraceEnabled)
                {
                    if (parentCount > 1)
                    {
                        log.Trace($"Following path from {child.ShortSha} (height {height - 1}) through first parent {commit.ShortSha} (height {height})...");
                    }
                    else if (height <= oldHeight)
                    {
                        if (commitsToCheck.Any() && commitsToCheck.Peek().Item2 == height)
                        {
                            log.Trace($"Backtracking to {child.ShortSha} (height {height - 1}) and following path through next parent {commit.ShortSha} (height {height})...");
                        }
                        else
                        {
                            log.Trace($"Backtracking to {child.ShortSha} (height {height - 1}) and following path through last parent {commit.ShortSha} (height {height})...");
                        }
                    }
                }
            }

            log.Debug($"{count:N0} commits checked.");

            var orderedCandidates = candidates.OrderBy(candidate => candidate.Version).ThenByDescending(candidate => candidate.Index).ToList();

            var tagWidth = log.IsDebugEnabled ? orderedCandidates.Max(candidate => candidate.Tag?.Length ?? 2) : 0;
            var versionWidth = log.IsDebugEnabled ? orderedCandidates.Max(candidate => candidate.Version?.ToString().Length ?? 4) : 0;
            var heightWidth = log.IsDebugEnabled ? orderedCandidates.Max(candidate => candidate.Height).ToString(CultureInfo.CurrentCulture).Length : 0;

            if (log.IsDebugEnabled)
            {
                foreach (var candidate in orderedCandidates.Take(orderedCandidates.Count - 1))
                {
                    log.Debug($"Ignoring {candidate.ToString(tagWidth, versionWidth, heightWidth)}.");
                }
            }

            var selectedCandidate = orderedCandidates.Last();

            if (selectedCandidate.Tag == null)
            {
                log.Info($"No commit found with a valid SemVer 2.0 version{(tagPrefix == null ? null : $" prefixed with '{tagPrefix}'")}. Using default version {selectedCandidate.Version}.");
            }

            log.Info($"Using{(log.IsDebugEnabled && orderedCandidates.Count > 1 ? "    " : " ")}{selectedCandidate.ToString(tagWidth, versionWidth, heightWidth)}.");

            return selectedCandidate.Version.WithHeight(selectedCandidate.Height, autoIncrement, defaultPreReleasePhase);
        }

private void Generate_LineBreak_Core(string id, params string[] lines)
        {
            var generator = new POGenerator(new POGeneratorSettings
            {
                IgnoreEncoding = true,
                SkipInfoHeaders = true,
            });

            var catalog = new POCatalog { Encoding = "UTF-8" };
            var entry = new POSingularEntry(new POKey(id));
            catalog.Add(entry);

            var sb = new StringBuilder();
            generator.Generate(sb, catalog);

            var expected = new List<string>();
            expected.Add(@"msgid """"");
            expected.AddRange(lines);
            expected.Add(@"msgstr """"");

            IEnumerable<string> actual = sb.ToString().Split(new[] { Environment.NewLine }, StringSplitOptions.None).Skip(5).Take(lines.Length + 2);
            replacedert.Equal(expected, actual);
        }

public string ToString(int take)
        {
            return string.Join("\t", this.Take(take).Select(factr => factr.ToString()));
        }

public void ResizeRationalPart(int size)
		{
			RationalPart = RationalPart.Take(size + 1).ToList();
		}

public void ResizeAlgebraicPart(int size)
		{
			AlgebraicPart = AlgebraicPart.Take(size + 1).ToList();
		}

public void ResizeQuadraticPart(int size)
		{
			QuadraticPart = QuadraticPart.Take(size + 1).ToList();
		}

public static Guid GetGuid(byte[] data, int index) 
            => new Guid(data.Skip(index).Take(16).ToArray());

public override VisualNode Render()
        {
            return new RxContentPage()
            {
                new RxStackLayout()
                {
                    new RxButton("SWITCH SMALL/LARGE LIST")
                        .OnClick(this.OnShowHideLargeList),
                        
                        new RxCollectionView<Monkey>()
                        { 
                            Header = RenderHeader(),
                            Footer = RenderFooter()
                        }
                            .RenderCollection(
                                _largePersonListVisible ? _allMonkeys : _allMonkeys.Take(4), 
                                RenderMonkey)
                            .VFillAndExpand()
                }
                .HFillAndExpand()
                .VFillAndExpand()
            };
        }

public IEnumerable<Enreplacedy> Select(int offset, int limit)
		{
			if (offset % limit != 0)
			{
				throw new ArgumentException("limit value must be a factor of offset");
			}

			var items = new List<Enreplacedy>();

			Select(0, (offset + limit) * _initialLimitMultiple, offset + limit, items);

			return items.Skip(offset).Take(limit).ToArray();
		}

public IEnumerable<T> Select(int offset, int limit)
		{
			var items = new List<T>();

			Select(0, (offset + limit) * _initialLimitMultiple, offset + limit, items);

			return items.Skip(offset).Take(limit).ToArray();
		}

public Page GetPage(int pageNumber)
		{
			var items = new List<T>();

			var totalUnfilteredItems = Gereplacedems(
				((_pageSize * pageNumber) * _initialSearchLimitMultiple),
				0,
				(_pageSize * pageNumber),
				items);

			var itemOffset = (pageNumber - 1) * _pageSize;

			var pageItems = items.Skip(itemOffset).Take(_pageSize).ToList();

			return new Page(pageItems, totalUnfilteredItems, pageNumber, _pageSize);
		}

public void WriteBytes(byte[] source, int offset, int length)
		{
			var range = source.Skip(offset).Take(length).ToArray();

			foreach (byte @byte in range)
			{
				this.WriteByte(@byte);
			}
		}

protected virtual ICrmEnreplacedySearchResultPage GenerateResultPage(ICollection<ICrmEnreplacedySearchResult> results, int approximateTotalHits, int pageNumber, int pageSize, RawSearchResultSet rawSearchResultSet)
        {
            var resultOffset = (pageNumber - 1) * pageSize;

            var pageResults = results.Skip(resultOffset).Take(pageSize).ToList();

            return new CrmEnreplacedySearchResultPage(pageResults, approximateTotalHits, pageNumber, pageSize);
        }

protected ICrmEnreplacedySearchResultPage GetUserSearchResults(ICrmEnreplacedyQuery query, int searchLimit, int initialOffset, int resultLimit, ICrmEnreplacedySearchResultFactory resultFactory, int pageNumber, int pageSize, ICollection<ICrmEnreplacedySearchResult> results)
        {
            ADXTrace.Instance.TraceInfo(TraceCategory.Application, string.Format("(searchLimit={0},rawOffset={1},resultLimit={2})", searchLimit, initialOffset, resultLimit));
            RawSearchResultSet rawSearchResults = GetRawSearchResults(query, searchLimit, initialOffset);
            
            if (initialOffset >= rawSearchResults.TotalHits)
            {
                return GenerateResultPage(results, rawSearchResults.TotalHits, pageNumber, pageSize, rawSearchResults);
            }

            var stopwatch = new Stopwatch();
            stopwatch.Start();
            var groupedNotes = new List<IGrouping<EnreplacedyReference, ICrmEnreplacedySearchResult>>();
            var displayNotes = IsAnnotationSearchEnabled();

            if (displayNotes && !string.IsNullOrEmpty(query.QueryTerm))
            {
                var rawNotes = this.GetRelatedAnnotations(rawSearchResults, query);

                var notes =
                    rawNotes.Select(doreplacedent => resultFactory.GetResult(doreplacedent, 1, results.Count + 1)).ToList();

                //Grouping Notes by related Knowledge Articles
                groupedNotes =
                    notes.Where(note => note.EnreplacedyLogicalName == "annotation")
                        .GroupBy(note => note.Enreplacedy.GetAttributeValue<EnreplacedyReference>("objectid"))
                        .ToList();
            }

            var offsetForNexreplacederation = initialOffset;

            foreach (var scoreDoc in rawSearchResults.Results)
            {
                offsetForNexreplacederation++;

                var result = resultFactory.GetResult(_searcher.Doc(scoreDoc.Doc), scoreDoc.Score, results.Count + 1);

                // Not a valid user result, filter out
                if (result == null)
                {
                    continue;
                }

                if (result.EnreplacedyLogicalName == "knowledgearticle" && displayNotes)
                {
                    var relatedNotes = groupedNotes.Where(a => a.Key.Id == result.EnreplacedyID).SelectMany(i => i).Take(3).ToList();

                    if (relatedNotes.Any(note => note.Fragment == result.Fragment))
                    {
                        result.Fragment = GetKnowledgeArticleDescription(result);
                    }
                    result.Enreplacedy["relatedNotes"] = relatedNotes;
                }

                results.Add(result);

                if (results.Count >= resultLimit)
                {
                    stopwatch.Stop();

					ADXTrace.Instance.TraceInfo(TraceCategory.Application, string.Format("Gathered {0} results, done ({1}ms)", results.Count, stopwatch.ElapsedMilliseconds));

                    PortalFeatureTrace.TraceInstance.LogSearch(FeatureTraceCategory.Search, results.Count, stopwatch.ElapsedMilliseconds, string.Format("Gathered {0} results, done ({1}ms)", results.Count, stopwatch.ElapsedMilliseconds));

                    return GenerateResultPage(results, rawSearchResults.TotalHits, pageNumber, pageSize, rawSearchResults);
                }
            }

            stopwatch.Stop();

            // We asked for more hits than we got back from Lucene, and we still didn't gather enough valid
            // results. That's all we're going to get, so the number of results we got is the number of hits.
            if (searchLimit >= rawSearchResults.TotalHits)
            {
                ADXTrace.Instance.TraceInfo(TraceCategory.Application, string.Format("All available results ({0}) gathered, done ({1}ms)", results.Count, stopwatch.ElapsedMilliseconds));

                PortalFeatureTrace.TraceInstance.LogSearch(FeatureTraceCategory.Search, results.Count, stopwatch.ElapsedMilliseconds, string.Format("All available results ({0}) gathered, done ({1}ms)", results.Count, stopwatch.ElapsedMilliseconds));

                return GenerateResultPage(results, results.Count, pageNumber, pageSize, rawSearchResults);
            }

			ADXTrace.Instance.TraceInfo(TraceCategory.Application, string.Format("{0} results gathered so far ({1}ms)", results.Count, stopwatch.ElapsedMilliseconds));

            PortalFeatureTrace.TraceInstance.LogSearch(FeatureTraceCategory.Search, results.Count, stopwatch.ElapsedMilliseconds, string.Format("{0} results gathered so far ({1}ms)", results.Count, stopwatch.ElapsedMilliseconds));

            return GetUserSearchResults(query, searchLimit * ExtendedSearchLimitMultiple, offsetForNexreplacederation, resultLimit, resultFactory, pageNumber, pageSize, results);
        }

protected override ICrmEnreplacedySearchResultPage GenerateResultPage(ICollection<ICrmEnreplacedySearchResult> results, int approximateTotalHits, int pageNumber, int pageSize, RawSearchResultSet rawSearchResultSet)
		{
			var resultOffset = (pageNumber - 1) * pageSize;
 
			var pageResults = results.Skip(resultOffset).Take(pageSize).ToList();

			return new CrmEnreplacedySearchResultPage(pageResults, approximateTotalHits, pageNumber, pageSize, rawSearchResultSet.FacetViews, rawSearchResultSet.SortingOptions);
		}

public static object Paginate(object input, int index, int count)
		{
			var blogPostsDrop = input as BlogPostsDrop;

			if (blogPostsDrop != null)
			{
				return BlogFunctions.Paginate(blogPostsDrop, index, count);
			}

			var forumThreadsDrop = input as ForumThreadsDrop;

			if (forumThreadsDrop != null)
			{
				return ForumFunctions.Paginate(forumThreadsDrop, index, count);
			}

			var forumPostsDrop = input as ForumPostsDrop;

			if (forumPostsDrop != null)
			{
				return ForumFunctions.Paginate(forumPostsDrop, index, count);
			}

			var enumerable = input as IEnumerable;

			if (enumerable != null)
			{
				return enumerable.Cast<object>().Skip(index).Take(count);
			}

			return input;
		}

public static object Take(object input, int count)
		{
			var blogPostsDrop = input as BlogPostsDrop;

			if (blogPostsDrop != null)
			{
				return BlogFunctions.Take(blogPostsDrop, count);
			}

			var forumThreadsDrop = input as ForumThreadsDrop;

			if (forumThreadsDrop != null)
			{
				return ForumFunctions.Take(forumThreadsDrop, count);
			}

			var forumPostsDrop = input as ForumPostsDrop;

			if (forumPostsDrop != null)
			{
				return ForumFunctions.Take(forumPostsDrop, count);
			}

			var enumerable = input as IEnumerable;

			if (enumerable != null)
			{
				return enumerable.Cast<object>().Take(count);
			}

			return input;
		}

private static IEnumerable<TResult> BatchIterator<TSource, TResult>(this IEnumerable<TSource> source, int size, Func<IEnumerable<TSource>, TResult> @select)
		{
			TSource[] parreplacedion = null;
			var count = 0;

			foreach (var item in source)
			{
				if (parreplacedion == null)
				{
					parreplacedion = new TSource[size];
				}

				parreplacedion[count++] = item;

				if (count != size)
				{
					continue;
				}

				yield return @select(parreplacedion.Select(x => x));
			   
				parreplacedion = null;
				count = 0;
			}

			// Return the last bucket with whatever elements are left.
			if (parreplacedion != null && count > 0)
			{
				yield return @select(parreplacedion.Take(count));
			}
		}

public void ProcessRequest(HttpContext context)
		{
			var prefix = context.Request.QueryString[TagNameQueryStringField];

			if (string.IsNullOrEmpty(prefix))
			{
				return;
			}

			int maxResults = int.TryParse(context.Request.QueryString[MaxResultsQueryStringField], out maxResults)
				? maxResults
				: MaxResultsDefault;

			var completions = GetTagNameCompletions(prefix);
			
			if  (completions.Count() > maxResults)
			{
				completions = completions.Take(maxResults);
			}
					
			foreach (var completion in completions)
			{
				context.Response.Write(completion + Environment.NewLine);
			}
		}

private string ConvertVirtualPathToResourceName(string virtualPath)
		{
			// converting an entire path
			// for all parts: prepend an '_' if the name starts with a numeric character
			// replace all '/' or '\\' with '.'
			// prepend the default namespace
			// besides a leading underscore, filenames remain unchanged

			var parts = virtualPath.Split(_directoryDelimiters, StringSplitOptions.RemoveEmptyEntries);

			if (parts.Any())
			{
				var partsWithUnderscores = parts.Select(p => Regex.IsMatch(p, @"^\d") ? "_" + p : p);
				var directories = partsWithUnderscores.Take(parts.Length - 1).Select(ConvertDirectoryToResourceName);
				var head = directories.Aggregate(Namespace, (h, d) => "{0}.{1}".FormatWith(h, d)).Replace('-', '_');
				var tail = partsWithUnderscores.Last();
				return "{0}.{1}".FormatWith(head, tail);
			}

			return null;
		}

private static string ToErrorMessage(Exception exception)
		{
			return string.Join(" ", ToExceptionPath(exception).Select(e => e.Message).Take(5).ToArray());
		}