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How to use EvaluateNull method of NBi.Core.Transformation.Transformer.Native.Text.TextToHtml class

Best NBi code snippet using NBi.Core.Transformation.Transformer.Native.Text.TextToHtml.EvaluateNull

TextTransformations.cs

Source:TextTransformations.cs

...16        public object Evaluate(object value)17        {18            switch (value)19            {20                case null: return EvaluateNull();21                case DBNull _: return EvaluateNull();22                case string s: return EvaluateHighLevelString(s);23                default:24                    var caster = new TextCaster();25                    var str = caster.Execute(value);26                    return EvaluateHighLevelString(str);27            }28        }29        protected virtual object EvaluateHighLevelString(string value)30        {31            if (string.IsNullOrEmpty(value))32                return EvaluateEmpty();33            if (value.Equals("(null)"))34                return EvaluateNull();35            if (value.Equals("(empty)") || string.IsNullOrEmpty(value))36                return EvaluateEmpty();37            if (value.Equals("(blank)") || string.IsNullOrWhiteSpace(value))38                return EvaluateBlank();39            if (value.StartsWith("(") && value.EndsWith(")"))40                return EvaluateSpecial(value);41            return EvaluateString(value as string);42        }43        protected virtual object EvaluateNull() => "(null)";44        protected virtual object EvaluateEmpty() => "(empty)";45        protected virtual object EvaluateBlank() => "(blank)";46        protected virtual object EvaluateSpecial(string value) => value;47        protected abstract object EvaluateString(string value);48    }49    class TextToHtml : AbstractTextTransformation50    {51        protected override object EvaluateString(string value) => WebUtility.HtmlEncode(value);52    }53    class TextToLower : AbstractTextTransformation54    {55        protected override object EvaluateString(string value) => value.ToLowerInvariant();56    }57    class TextToUpper : AbstractTextTransformation58    {59        protected override object EvaluateString(string value) => value.ToUpperInvariant();60    }61    class TextToTrim : AbstractTextTransformation62    {63        protected override object EvaluateBlank() => "(empty)";64        protected override object EvaluateString(string value) => value.Trim();65    }66    abstract class AbstractTextAppend : AbstractTextTransformation67    {68        public IScalarResolver<string> Append { get; }69        public AbstractTextAppend(IScalarResolver<string> append)70            => Append = append;71        protected override object EvaluateEmpty() => Append.Execute();72        protected override object EvaluateBlank() => Append.Execute();73    }74    class TextToPrefix : AbstractTextAppend75    {76        public TextToPrefix(IScalarResolver<string> prefix)77            : base(prefix) { }78        protected override object EvaluateString(string value) => $"{Append.Execute()}{value}";79    }80    class TextToSuffix : AbstractTextAppend81    {82        public TextToSuffix(IScalarResolver<string> suffix)83            : base(suffix) { }84        protected override object EvaluateString(string value) => $"{value}{Append.Execute()}";85    }86    abstract class AbstractTextLengthTransformation : AbstractTextTransformation87    {88        public IScalarResolver<int> Length { get; }89        public AbstractTextLengthTransformation(IScalarResolver<int> length)90            => Length = length;91    }92    class TextToFirstChars : AbstractTextLengthTransformation93    {94        public TextToFirstChars(IScalarResolver<int> length)95            : base(length) { }96        protected override object EvaluateString(string value)97            => value.Length >= Length.Execute() ? value.Substring(0, Length.Execute()) : value;98    }99    class TextToLastChars : AbstractTextLengthTransformation100    {101        public TextToLastChars(IScalarResolver<int> length)102            : base(length) { }103        protected override object EvaluateString(string value)104            => value.Length >= Length.Execute() ? value.Substring(value.Length - Length.Execute(), Length.Execute()) : value;105    }106    class TextToSkipFirstChars : AbstractTextLengthTransformation107    {108        public TextToSkipFirstChars(IScalarResolver<int> length)109            : base(length) { }110        protected override object EvaluateString(string value)111            => value.Length <= Length.Execute() ? "(empty)" : value.Substring(Length.Execute(), value.Length - Length.Execute());112    }113    class TextToSkipLastChars : AbstractTextLengthTransformation114    {115        public TextToSkipLastChars(IScalarResolver<int> length)116            : base(length) { }117        protected override object EvaluateString(string value)118            => value.Length <= Length.Execute() ? "(empty)" : value.Substring(0, value.Length - Length.Execute());119    }120    abstract class AbstractTextPadTransformation : AbstractTextLengthTransformation121    {122        public IScalarResolver<char> Character { get; }123        public AbstractTextPadTransformation(IScalarResolver<int> length, IScalarResolver<char> character)124            : base(length)125            => Character = character;126        protected override object EvaluateEmpty() => new string(Character.Execute(), Length.Execute());127        protected override object EvaluateNull() => new string(Character.Execute(), Length.Execute());128    }129    class TextToPadRight : AbstractTextPadTransformation130    {131        public TextToPadRight(IScalarResolver<int> length, IScalarResolver<char> character)132            : base(length, character) { }133        protected override object EvaluateString(string value)134            => value.Length >= Length.Execute() ? value : value.PadRight(Length.Execute(), Character.Execute());135    }136    class TextToPadLeft : AbstractTextPadTransformation137    {138        public TextToPadLeft(IScalarResolver<int> length, IScalarResolver<char> character)139            : base(length, character) { }140        protected override object EvaluateString(string value)141            => value.Length >= Length.Execute() ? value : value.PadLeft(Length.Execute(), Character.Execute());142    }143    class BlankToEmpty : AbstractTextTransformation144    {145        protected override object EvaluateBlank() => "(empty)";146        protected override object EvaluateString(string value) => value;147    }148    class BlankToNull : AbstractTextTransformation149    {150        protected override object EvaluateBlank() => "(null)";151        protected override object EvaluateEmpty() => "(null)";152        protected override object EvaluateString(string value) => value;153    }154    class EmptyToNull : AbstractTextTransformation155    {156        protected override object EvaluateEmpty() => "(null)";157        protected override object EvaluateString(string value) => value;158    }159    class NullToEmpty : AbstractTextTransformation160    {161        protected override object EvaluateNull() => "(empty)";162        protected override object EvaluateString(string value) => value;163    }164    class HtmlToText : AbstractTextTransformation165    {166        protected override object EvaluateString(string value) => WebUtility.HtmlDecode(value);167    }168    class TextToLength : AbstractTextTransformation169    {170        protected override object EvaluateSpecial(string value) => -1;171        protected override object EvaluateBlank() => -1;172        protected override object EvaluateEmpty() => 0;173        protected override object EvaluateNull() => 0;174        protected override object EvaluateString(string value) => value.Length;175    }176    class TextToToken : AbstractTextTransformation177    {178        public IScalarResolver<int> Index { get; }179        public IScalarResolver<char> Separator { get; }180        public TextToToken(IScalarResolver<int> index)181            => (Index, Separator) = (index, null);182        public TextToToken(IScalarResolver<int> index, IScalarResolver<char> separator)183            => (Index, Separator) = (index, separator);184        protected override object EvaluateBlank() => Separator == null || char.IsWhiteSpace(Separator.Execute()) ? "(null)" : "(blank)";185        protected override object EvaluateEmpty() => "(null)";186        protected override object EvaluateString(string value)187        {...

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