/// <summary>
        /// Method to handle inline replacement of style tag by opening style definition.
        /// </summary>
        /// <param name="sourceText"></param>
        /// <param name="srcIndex"></param>
        /// <param name="srcOffset"></param>
        /// <param name="charBuffer"></param>
        /// <param name="writeIndex"></param>
        /// <param name="styleStack"></param>
        /// <returns></returns>
        static bool ReplaceOpeningStyleTag(ref string sourceText, int srcIndex, out int srcOffset, ref int[] charBuffer, ref int writeIndex, ref TextProcessingStack <int> styleStack, ref TextGenerationSettings generationSettings)
        {
            // Validate <style> tag.
            int hashCode = GetTagHashCode(ref sourceText, srcIndex + 7, out srcOffset);

            TextStyle style = GetStyle(generationSettings, hashCode);

            // Return if we don't have a valid style.
            if (style == null || srcOffset == 0)
            {
                return(false);
            }

            styleStack.Add(style.hashCode);

            int styleLength = style.styleOpeningTagArray.Length;

            // Replace <style> tag with opening definition
            int[] openingTagArray = style.styleOpeningTagArray;

            for (int i = 0; i < styleLength; i++)
            {
                int c = openingTagArray[i];

                if (c == 60)
                {
                    if (IsTagName(ref openingTagArray, "<BR>", i))
                    {
                        if (writeIndex == charBuffer.Length)
                        {
                            ResizeInternalArray(ref charBuffer);
                        }

                        charBuffer[writeIndex] = 10;
                        writeIndex            += 1;
                        i += 3;

                        continue;
                    }
                    if (IsTagName(ref openingTagArray, "<STYLE=", i))
                    {
                        int offset;
                        if (ReplaceOpeningStyleTag(ref openingTagArray, i, out offset, ref charBuffer, ref writeIndex, ref styleStack, ref generationSettings))
                        {
                            i = offset;
                            continue;
                        }
                    }
                    else if (IsTagName(ref openingTagArray, "</STYLE>", i))
                    {
                        ReplaceClosingStyleTag(ref charBuffer, ref writeIndex, ref styleStack, ref generationSettings);

                        // Strip </style> even if style is invalid.
                        i += 7;
                        continue;
                    }
                }

                if (writeIndex == charBuffer.Length)
                {
                    ResizeInternalArray(ref charBuffer);
                }

                charBuffer[writeIndex] = c;
                writeIndex            += 1;
            }

            return(true);
        }
        /// <summary>
        /// Method to handle inline replacement of style tag by closing style definition.
        /// </summary>
        /// <param name="charBuffer"></param>
        /// <param name="writeIndex"></param>
        /// <param name="styleStack"></param>
        /// <returns></returns>
        static void ReplaceClosingStyleTag(ref int[] charBuffer, ref int writeIndex, ref TextProcessingStack <int> styleStack, ref TextGenerationSettings generationSettings)
        {
            // Get style from the Style Stack
            int       hashCode = styleStack.CurrentItem();
            TextStyle style    = GetStyle(generationSettings, hashCode);

            styleStack.Remove();

            // Return if we don't have a valid style.
            if (style == null)
            {
                return;
            }

            int styleLength = style.styleClosingTagArray.Length;

            // Replace <style> tag with opening definition
            int[] closingTagArray = style.styleClosingTagArray;

            for (int i = 0; i < styleLength; i++)
            {
                int c = closingTagArray[i];

                if (c == 60)
                {
                    if (IsTagName(ref closingTagArray, "<BR>", i))
                    {
                        if (writeIndex == charBuffer.Length)
                        {
                            ResizeInternalArray(ref charBuffer);
                        }

                        charBuffer[writeIndex] = 10;
                        writeIndex            += 1;
                        i += 3;

                        continue;
                    }
                    if (IsTagName(ref closingTagArray, "<STYLE=", i))
                    {
                        int offset;
                        if (ReplaceOpeningStyleTag(ref closingTagArray, i, out offset, ref charBuffer, ref writeIndex, ref styleStack, ref generationSettings))
                        {
                            i = offset;
                            continue;
                        }
                    }
                    else if (IsTagName(ref closingTagArray, "</STYLE>", i))
                    {
                        ReplaceClosingStyleTag(ref charBuffer, ref writeIndex, ref styleStack, ref generationSettings);

                        // Strip </style> even if style is invalid.
                        i += 7;
                        continue;
                    }
                }

                if (writeIndex == charBuffer.Length)
                {
                    ResizeInternalArray(ref charBuffer);
                }

                charBuffer[writeIndex] = c;
                writeIndex            += 1;
            }
        }
        /// <summary>
        /// Method to store the content of a string into an integer array.
        /// </summary>
        /// <param name="sourceText"></param>
        /// <param name="charBuffer"></param>
        /// <param name="styleStack"></param>
        /// <param name="generationSettings"></param>
        public static void StringToCharArray(string sourceText, ref int[] charBuffer, ref TextProcessingStack <int> styleStack, TextGenerationSettings generationSettings)
        {
            if (sourceText == null)
            {
                charBuffer[0] = 0;
                return;
            }

            if (charBuffer == null)
            {
                charBuffer = new int[8];
            }

            // Clear the Style stack.
            styleStack.SetDefault(0);

            int writeIndex = 0;

            for (int i = 0; i < sourceText.Length; i++)
            {
                if (sourceText[i] == 92 && sourceText.Length > i + 1)
                {
                    switch ((int)sourceText[i + 1])
                    {
                    case 85:     // \U00000000 for UTF-32 Unicode
                        if (sourceText.Length > i + 9)
                        {
                            if (writeIndex == charBuffer.Length)
                            {
                                ResizeInternalArray(ref charBuffer);
                            }

                            charBuffer[writeIndex] = GetUtf32(sourceText, i + 2);
                            i          += 9;
                            writeIndex += 1;
                            continue;
                        }
                        break;

                    case 92:     // \ escape
                        if (!generationSettings.parseControlCharacters)
                        {
                            break;
                        }

                        if (sourceText.Length <= i + 2)
                        {
                            break;
                        }

                        if (writeIndex + 2 > charBuffer.Length)
                        {
                            ResizeInternalArray(ref charBuffer);
                        }

                        charBuffer[writeIndex]     = sourceText[i + 1];
                        charBuffer[writeIndex + 1] = sourceText[i + 2];
                        i          += 2;
                        writeIndex += 2;
                        continue;

                    case 110:     // \n LineFeed
                        if (!generationSettings.parseControlCharacters)
                        {
                            break;
                        }

                        if (writeIndex == charBuffer.Length)
                        {
                            ResizeInternalArray(ref charBuffer);
                        }

                        charBuffer[writeIndex] = (char)10;
                        i          += 1;
                        writeIndex += 1;
                        continue;

                    case 114:     // \r
                        if (!generationSettings.parseControlCharacters)
                        {
                            break;
                        }

                        if (writeIndex == charBuffer.Length)
                        {
                            ResizeInternalArray(ref charBuffer);
                        }

                        charBuffer[writeIndex] = (char)13;
                        i          += 1;
                        writeIndex += 1;
                        continue;

                    case 116:     // \t Tab
                        if (!generationSettings.parseControlCharacters)
                        {
                            break;
                        }

                        if (writeIndex == charBuffer.Length)
                        {
                            ResizeInternalArray(ref charBuffer);
                        }

                        charBuffer[writeIndex] = (char)9;
                        i          += 1;
                        writeIndex += 1;
                        continue;

                    case 117:     // \u0000 for UTF-16 Unicode
                        if (sourceText.Length > i + 5)
                        {
                            if (writeIndex == charBuffer.Length)
                            {
                                ResizeInternalArray(ref charBuffer);
                            }

                            charBuffer[writeIndex] = (char)GetUtf16(sourceText, i + 2);
                            i          += 5;
                            writeIndex += 1;
                            continue;
                        }
                        break;
                    }
                }

                // Handle UTF-32 in the input text (string). // Not sure this is needed //
                if (Char.IsHighSurrogate(sourceText[i]) && Char.IsLowSurrogate(sourceText[i + 1]))
                {
                    if (writeIndex == charBuffer.Length)
                    {
                        ResizeInternalArray(ref charBuffer);
                    }

                    charBuffer[writeIndex] = Char.ConvertToUtf32(sourceText[i], sourceText[i + 1]);
                    i          += 1;
                    writeIndex += 1;
                    continue;
                }

                //// Handle inline replacement of <stlye> and <br> tags.
                if (sourceText[i] == 60 && generationSettings.richText)
                {
                    if (IsTagName(ref sourceText, "<BR>", i))
                    {
                        if (writeIndex == charBuffer.Length)
                        {
                            ResizeInternalArray(ref charBuffer);
                        }

                        charBuffer[writeIndex] = 10;
                        writeIndex            += 1;
                        i += 3;

                        continue;
                    }
                    if (IsTagName(ref sourceText, "<STYLE=", i))
                    {
                        int srcOffset;
                        if (ReplaceOpeningStyleTag(ref sourceText, i, out srcOffset, ref charBuffer, ref writeIndex, ref styleStack, ref generationSettings))
                        {
                            i = srcOffset;
                            continue;
                        }
                    }
                    else if (IsTagName(ref sourceText, "</STYLE>", i))
                    {
                        ReplaceClosingStyleTag(ref charBuffer, ref writeIndex, ref styleStack, ref generationSettings);

                        // Strip </style> even if style is invalid.
                        i += 7;
                        continue;
                    }
                }

                if (writeIndex == charBuffer.Length)
                {
                    ResizeInternalArray(ref charBuffer);
                }

                charBuffer[writeIndex] = sourceText[i];
                writeIndex            += 1;
            }

            if (writeIndex == charBuffer.Length)
            {
                ResizeInternalArray(ref charBuffer);
            }

            charBuffer[writeIndex] = (char)0;
        }