Refactor render graph & DSL; remove material system

- Major optimization of Ghost.RenderGraph.Concept: pooled resources, zero-allocation hot paths, explicit queue types, and batch barrier APIs.
- Migrated Ghost.DSL shader compiler to ANTLR4-based parser; removed hand-written parser, added grammar files and semantic model conversion.
- Added CollectionPool/ListPool for pooled list management.
- Updated documentation for new architecture and performance.
- Removed Ghost.Shader.Concept (material/material system) from repo and solution.
- README.md replaced with a brief project statement.

Ghost.DSL/ShaderParser/AntlrShaderCompiler.cs

@@ -0,0 +1,383 @@
+using Antlr4.Runtime;
+using Ghost.Core.Graphics;
+using Ghost.DSL.ShaderCompiler;
+using Ghost.DSL.ShaderParser.Model;
+
+namespace Ghost.DSL.ShaderParser;
+
+public class AntlrShaderCompiler
+{
+    public static List<ShaderModel> ParseShaders(string source, out List<DSLShaderError> errors)
+    {
+        errors = new List<DSLShaderError>();
+
+        try
+        {
+            var inputStream = new AntlrInputStream(source);
+            var lexer = new GhostShaderLexer(inputStream);
+
+            // Capture lexer errors
+            lexer.RemoveErrorListeners();
+            var lexerErrorListener = new ErrorListener(errors);
+            lexer.AddErrorListener(lexerErrorListener);
+
+            var tokenStream = new CommonTokenStream(lexer);
+            var parser = new GhostShaderParser(tokenStream);
+
+            // Capture parser errors
+            parser.RemoveErrorListeners();
+            var parserErrorListener = new ErrorListener(errors);
+            parser.AddErrorListener(parserErrorListener);
+
+            var tree = parser.shaderFile();
+
+            if (errors.Count > 0)
+            {
+                return new List<ShaderModel>();
+            }
+
+            var visitor = new ShaderVisitor();
+            visitor.Visit(tree);
+
+            return visitor.Shaders;
+        }
+        catch (Exception ex)
+        {
+            errors.Add(new DSLShaderError
+            {
+                message = $"Unexpected error during parsing: {ex.Message}",
+                line = -1,
+                column = -1
+            });
+            return new List<ShaderModel>();
+        }
+    }
+
+    public static DSLShaderSemantics? ConvertToSemantics(ShaderModel model, out List<DSLShaderError> errors)
+    {
+        errors = new List<DSLShaderError>();
+
+        if (string.IsNullOrWhiteSpace(model.Name))
+        {
+            errors.Add(new DSLShaderError
+            {
+                message = "Shader name cannot be empty.",
+                line = 0,
+                column = 0
+            });
+            return null;
+        }
+
+        var semantics = new DSLShaderSemantics
+        {
+            name = model.Name,
+            properties = ConvertProperties(model.Properties, errors),
+            pipeline = ConvertPipeline(model.Pipeline, errors)
+        };
+
+        foreach (var pass in model.Passes)
+        {
+            var passSemantic = ConvertPass(pass, errors);
+            if (passSemantic != null)
+            {
+                semantics.passes ??= new List<PassSemantic>();
+                semantics.passes.Add(passSemantic);
+            }
+        }
+
+        return semantics;
+    }
+
+    private static List<PropertySemantic>? ConvertProperties(PropertiesBlockModel? properties, List<DSLShaderError> errors)
+    {
+        if (properties == null || properties.Properties.Count == 0)
+        {
+            return null;
+        }
+
+        var result = new List<PropertySemantic>();
+        var usedNames = new HashSet<string>();
+
+        foreach (var prop in properties.Properties)
+        {
+            if (usedNames.Contains(prop.Name))
+            {
+                errors.Add(new DSLShaderError
+                {
+                    message = $"Duplicate property name '{prop.Name}'.",
+                    line = 0,
+                    column = 0
+                });
+                continue;
+            }
+
+            var semantic = new PropertySemantic
+            {
+                name = prop.Name,
+                scope = prop.Scope?.ToLower() == "global" ? PropertyScope.Global : PropertyScope.Local,
+                type = ParsePropertyType(prop.Type, errors)
+            };
+
+            if (prop.Initializer.Count > 0)
+            {
+                semantic.defaultValue = ParsePropertyValue(semantic.type, prop.Initializer, errors);
+            }
+
+            usedNames.Add(prop.Name);
+            result.Add(semantic);
+        }
+
+        return result;
+    }
+
+    private static ShaderPropertyType ParsePropertyType(string type, List<DSLShaderError> errors)
+    {
+        return type.ToLower() switch
+        {
+            "float" => ShaderPropertyType.Float,
+            "float2" => ShaderPropertyType.Float2,
+            "float3" => ShaderPropertyType.Float3,
+            "float4" => ShaderPropertyType.Float4,
+            "float4x4" => ShaderPropertyType.Float4x4,
+            "int" => ShaderPropertyType.Int,
+            "int2" => ShaderPropertyType.Int2,
+            "int3" => ShaderPropertyType.Int3,
+            "int4" => ShaderPropertyType.Int4,
+            "uint" => ShaderPropertyType.UInt,
+            "uint2" => ShaderPropertyType.UInt2,
+            "uint3" => ShaderPropertyType.UInt3,
+            "uint4" => ShaderPropertyType.UInt4,
+            "bool" => ShaderPropertyType.Bool,
+            "bool2" => ShaderPropertyType.Bool2,
+            "bool3" => ShaderPropertyType.Bool3,
+            "bool4" => ShaderPropertyType.Bool4,
+            "tex2d" => ShaderPropertyType.Texture2D,
+            "tex3d" => ShaderPropertyType.Texture3D,
+            "texcube" => ShaderPropertyType.TextureCube,
+            "texcube_arr" => ShaderPropertyType.TextureCubeArray,
+            "tex2d_arr" => ShaderPropertyType.Texture2DArray,
+            "sampler" => ShaderPropertyType.Sampler,
+            _ => ShaderPropertyType.None
+        };
+    }
+
+    private static object? ParsePropertyValue(ShaderPropertyType type, List<string> values, List<DSLShaderError> errors)
+    {
+        // For textures, the value is an identifier (e.g., "white", "black")
+        if (type is ShaderPropertyType.Texture2D or ShaderPropertyType.Texture3D or ShaderPropertyType.TextureCube)
+        {
+            return values.Count > 0 ? values[0] : null;
+        }
+
+        // For samplers, no default value
+        if (type == ShaderPropertyType.Sampler)
+        {
+            return null;
+        }
+
+        // For numeric types, parse the values
+        try
+        {
+            return type switch
+            {
+                ShaderPropertyType.Float => values.Count > 0 ? float.Parse(values[0], System.Globalization.CultureInfo.InvariantCulture) : 0f,
+                ShaderPropertyType.Float2 => values.Count >= 2 ? new Misaki.HighPerformance.Mathematics.float2(
+                    float.Parse(values[0], System.Globalization.CultureInfo.InvariantCulture),
+                    float.Parse(values[1], System.Globalization.CultureInfo.InvariantCulture)) : default,
+                ShaderPropertyType.Float3 => values.Count >= 3 ? new Misaki.HighPerformance.Mathematics.float3(
+                    float.Parse(values[0], System.Globalization.CultureInfo.InvariantCulture),
+                    float.Parse(values[1], System.Globalization.CultureInfo.InvariantCulture),
+                    float.Parse(values[2], System.Globalization.CultureInfo.InvariantCulture)) : default,
+                ShaderPropertyType.Float4 => values.Count >= 4 ? new Misaki.HighPerformance.Mathematics.float4(
+                    float.Parse(values[0], System.Globalization.CultureInfo.InvariantCulture),
+                    float.Parse(values[1], System.Globalization.CultureInfo.InvariantCulture),
+                    float.Parse(values[2], System.Globalization.CultureInfo.InvariantCulture),
+                    float.Parse(values[3], System.Globalization.CultureInfo.InvariantCulture)) : default,
+                ShaderPropertyType.Int => values.Count > 0 ? int.Parse(values[0], System.Globalization.CultureInfo.InvariantCulture) : 0,
+                ShaderPropertyType.Int2 => values.Count >= 2 ? new Misaki.HighPerformance.Mathematics.int2(
+                    int.Parse(values[0], System.Globalization.CultureInfo.InvariantCulture),
+                    int.Parse(values[1], System.Globalization.CultureInfo.InvariantCulture)) : default,
+                ShaderPropertyType.Int3 => values.Count >= 3 ? new Misaki.HighPerformance.Mathematics.int3(
+                    int.Parse(values[0], System.Globalization.CultureInfo.InvariantCulture),
+                    int.Parse(values[1], System.Globalization.CultureInfo.InvariantCulture),
+                    int.Parse(values[2], System.Globalization.CultureInfo.InvariantCulture)) : default,
+                ShaderPropertyType.Int4 => values.Count >= 4 ? new Misaki.HighPerformance.Mathematics.int4(
+                    int.Parse(values[0], System.Globalization.CultureInfo.InvariantCulture),
+                    int.Parse(values[1], System.Globalization.CultureInfo.InvariantCulture),
+                    int.Parse(values[2], System.Globalization.CultureInfo.InvariantCulture),
+                    int.Parse(values[3], System.Globalization.CultureInfo.InvariantCulture)) : default,
+                ShaderPropertyType.UInt => values.Count > 0 ? uint.Parse(values[0], System.Globalization.CultureInfo.InvariantCulture) : 0u,
+                ShaderPropertyType.Bool => values.Count > 0 && (values[0] == "1" || values[0].ToLower() == "true"),
+                _ => null
+            };
+        }
+        catch (Exception ex)
+        {
+            errors.Add(new DSLShaderError
+            {
+                message = $"Failed to parse property value: {ex.Message}",
+                line = 0,
+                column = 0
+            });
+            return null;
+        }
+    }
+
+    private static PipelineSemantic? ConvertPipeline(PipelineBlockModel? pipeline, List<DSLShaderError> errors)
+    {
+        if (pipeline == null || pipeline.Statements.Count == 0)
+        {
+            return null;
+        }
+
+        var semantic = new PipelineSemantic();
+
+        foreach (var (key, value) in pipeline.Statements)
+        {
+            switch (key.ToLower())
+            {
+                case "ztest":
+                    semantic.zTest = value.ToLower() switch
+                    {
+                        "disabled" => ZTest.Disabled,
+                        "less" => ZTest.Less,
+                        "lessequal" => ZTest.LessEqual,
+                        "equal" => ZTest.Equal,
+                        "greaterequal" => ZTest.GreaterEqual,
+                        "greater" => ZTest.Greater,
+                        "notequal" => ZTest.NotEqual,
+                        "always" => ZTest.Always,
+                        _ => ZTest.Disabled
+                    };
+                    break;
+                case "zwrite":
+                    semantic.zWrite = value.ToLower() == "on" ? ZWrite.On : ZWrite.Off;
+                    break;
+                case "cull":
+                    semantic.cull = value.ToLower() switch
+                    {
+                        "off" => Cull.Off,
+                        "front" => Cull.Front,
+                        "back" => Cull.Back,
+                        _ => Cull.Off
+                    };
+                    break;
+                case "blend":
+                    semantic.blend = value.ToLower() switch
+                    {
+                        "opaque" => Blend.Opaque,
+                        "alpha" => Blend.Alpha,
+                        "additive" => Blend.Additive,
+                        "multiply" => Blend.Multiply,
+                        "premultipliedalpha" => Blend.PremultipliedAlpha,
+                        _ => Blend.Opaque
+                    };
+                    break;
+                case "color_mask":
+                    semantic.colorMask = value.ToLower() == "all" ? ColorWriteMask.All : ColorWriteMask.None;
+                    break;
+            }
+        }
+
+        return semantic;
+    }
+
+    private static PassSemantic? ConvertPass(PassBlockModel pass, List<DSLShaderError> errors)
+    {
+        var semantic = new PassSemantic
+        {
+            name = pass.Name,
+            hlsl = pass.Hlsl?.Code,
+            defines = pass.Defines?.Defines,
+            includes = pass.Includes?.Includes,
+            localPipeline = ConvertPipeline(pass.LocalPipeline, errors)
+        };
+
+        if (pass.Keywords != null)
+        {
+            semantic.keywords = new List<KeywordsGroup>();
+            foreach (var group in pass.Keywords.Groups)
+            {
+                var keywordGroup = new KeywordsGroup
+                {
+                    space = group.Scope?.ToLower() == "global" ? KeywordSpace.Global : KeywordSpace.Local,
+                    keywords = group.Keywords
+                };
+                semantic.keywords.Add(keywordGroup);
+            }
+        }
+
+        foreach (var entry in pass.ShaderEntries)
+        {
+            var entryType = entry.EntryType.ToLower();
+            var shaderEntry = new ShaderEntryPoint
+            {
+                shader = entry.ShaderPath,
+                entry = entry.EntryPoint
+            };
+
+            switch (entryType)
+            {
+                case "mesh" or "ms":
+                    semantic.meshShader = shaderEntry;
+                    break;
+                case "pixel" or "ps":
+                    semantic.pixelShader = shaderEntry;
+                    break;
+                case "task" or "ts":
+                    semantic.taskShader = shaderEntry;
+                    break;
+                default:
+                    errors.Add(new DSLShaderError
+                    {
+                        message = $"Unknown shader entry type '{entry.EntryType}'.",
+                        line = 0,
+                        column = 0
+                    });
+                    break;
+            }
+        }
+
+        if (semantic.meshShader.shader == null || semantic.pixelShader.shader == null)
+        {
+            errors.Add(new DSLShaderError
+            {
+                message = $"Pass '{pass.Name}' must contain a mesh/ms shader and a pixel/ps shader declaration.",
+                line = 0,
+                column = 0
+            });
+        }
+
+        return semantic;
+    }
+
+    private class ErrorListener : BaseErrorListener, IAntlrErrorListener<int>, IAntlrErrorListener<IToken>
+    {
+        private readonly List<DSLShaderError> _errors;
+
+        public ErrorListener(List<DSLShaderError> errors)
+        {
+            _errors = errors;
+        }
+
+        public void SyntaxError(TextWriter output, IRecognizer recognizer, int offendingSymbol, int line, int charPositionInLine, string msg, RecognitionException e)
+        {
+            _errors.Add(new DSLShaderError
+            {
+                message = msg,
+                line = line,
+                column = charPositionInLine
+            });
+        }
+
+        public new void SyntaxError(TextWriter output, IRecognizer recognizer, IToken offendingSymbol, int line, int charPositionInLine, string msg, RecognitionException e)
+        {
+            _errors.Add(new DSLShaderError
+            {
+                message = msg,
+                line = line,
+                column = charPositionInLine
+            });
+        }
+    }
+}

Ghost.DSL/ShaderParser/Model/ShaderModel.cs

@@ -0,0 +1,78 @@
+namespace Ghost.DSL.ShaderParser.Model;
+
+public class ShaderModel
+{
+    public string Name { get; set; } = string.Empty;
+    public PropertiesBlockModel? Properties { get; set; }
+    public PipelineBlockModel? Pipeline { get; set; }
+    public List<PassBlockModel> Passes { get; set; } = new();
+    public List<FunctionCallModel> FunctionCalls { get; set; } = new();
+}
+
+public class PropertiesBlockModel
+{
+    public List<PropertyDeclarationModel> Properties { get; set; } = new();
+}
+
+public class PropertyDeclarationModel
+{
+    public string? Scope { get; set; }
+    public string Type { get; set; } = string.Empty;
+    public string Name { get; set; } = string.Empty;
+    public List<string> Initializer { get; set; } = new();
+}
+
+public class PipelineBlockModel
+{
+    public Dictionary<string, string> Statements { get; set; } = new();
+}
+
+public class PassBlockModel
+{
+    public string Name { get; set; } = string.Empty;
+    public PipelineBlockModel? LocalPipeline { get; set; }
+    public DefinesBlockModel? Defines { get; set; }
+    public IncludesBlockModel? Includes { get; set; }
+    public KeywordsBlockModel? Keywords { get; set; }
+    public HlslBlockModel? Hlsl { get; set; }
+    public List<ShaderEntryModel> ShaderEntries { get; set; } = new();
+}
+
+public class DefinesBlockModel
+{
+    public List<string> Defines { get; set; } = new();
+}
+
+public class IncludesBlockModel
+{
+    public List<string> Includes { get; set; } = new();
+}
+
+public class KeywordsBlockModel
+{
+    public List<KeywordGroupModel> Groups { get; set; } = new();
+}
+
+public class KeywordGroupModel
+{
+    public string? Scope { get; set; }
+    public List<string> Keywords { get; set; } = new();
+}
+
+public class HlslBlockModel
+{
+    public string Code { get; set; } = string.Empty;
+}
+
+public class ShaderEntryModel
+{
+    public string EntryType { get; set; } = string.Empty;  // "mesh", "pixel", "task", etc.
+    public string ShaderPath { get; set; } = string.Empty;
+    public string EntryPoint { get; set; } = string.Empty;
+}
+
+public class FunctionCallModel
+{
+    public string Name { get; set; } = string.Empty;
+    public List<string> Arguments { get; set; } = new();
+}

Ghost.DSL/ShaderParser/ShaderVisitor.cs

@@ -0,0 +1,261 @@
+using Antlr4.Runtime.Misc;
+using Ghost.DSL.ShaderParser.Model;
+
+namespace Ghost.DSL.ShaderParser;
+
+public class ShaderVisitor : GhostShaderParserBaseVisitor<object>
+{
+    public List<ShaderModel> Shaders { get; } = new();
+
+    public override object VisitShaderFile([NotNull] GhostShaderParser.ShaderFileContext context)
+    {
+        foreach (var shaderContext in context.shader())
+        {
+            var shader = (ShaderModel)VisitShader(shaderContext);
+            Shaders.Add(shader);
+        }
+        return Shaders;
+    }
+
+    public override object VisitShader([NotNull] GhostShaderParser.ShaderContext context)
+    {
+        var shader = new ShaderModel
+        {
+            Name = StripQuotes(context.STRING_LITERAL().GetText())
+        };
+
+        var shaderBody = context.shaderBody();
+        if (shaderBody != null)
+        {
+            foreach (var propBlock in shaderBody.propertiesBlock())
+            {
+                shader.Properties = (PropertiesBlockModel)VisitPropertiesBlock(propBlock);
+            }
+
+            foreach (var pipelineBlock in shaderBody.pipelineBlock())
+            {
+                shader.Pipeline = (PipelineBlockModel)VisitPipelineBlock(pipelineBlock);
+            }
+
+            foreach (var passBlock in shaderBody.passBlock())
+            {
+                shader.Passes.Add((PassBlockModel)VisitPassBlock(passBlock));
+            }
+
+            foreach (var funcCall in shaderBody.functionCall())
+            {
+                shader.FunctionCalls.Add((FunctionCallModel)VisitFunctionCall(funcCall));
+            }
+        }
+
+        return shader;
+    }
+
+    public override object VisitPropertiesBlock([NotNull] GhostShaderParser.PropertiesBlockContext context)
+    {
+        var properties = new PropertiesBlockModel();
+
+        foreach (var propDecl in context.propertyDeclaration())
+        {
+            properties.Properties.Add((PropertyDeclarationModel)VisitPropertyDeclaration(propDecl));
+        }
+
+        return properties;
+    }
+
+    public override object VisitPropertyDeclaration([NotNull] GhostShaderParser.PropertyDeclarationContext context)
+    {
+        var property = new PropertyDeclarationModel
+        {
+            Type = context.IDENTIFIER(0).GetText(),
+            Name = context.IDENTIFIER(1).GetText()
+        };
+
+        if (context.scope() != null)
+        {
+            property.Scope = context.scope().GetText();
+        }
+
+        if (context.propertyInitializer() != null)
+        {
+            var init = context.propertyInitializer();
+            foreach (var number in init.NUMBER())
+            {
+                property.Initializer.Add(number.GetText());
+            }
+            foreach (var identifier in init.IDENTIFIER())
+            {
+                property.Initializer.Add(identifier.GetText());
+            }
+        }
+
+        return property;
+    }
+
+    public override object VisitPipelineBlock([NotNull] GhostShaderParser.PipelineBlockContext context)
+    {
+        var pipeline = new PipelineBlockModel();
+
+        foreach (var statement in context.pipelineStatement())
+        {
+            var key = statement.IDENTIFIER(0).GetText();
+            var value = statement.IDENTIFIER(1).GetText();
+            pipeline.Statements[key] = value;
+        }
+
+        return pipeline;
+    }
+
+    public override object VisitPassBlock([NotNull] GhostShaderParser.PassBlockContext context)
+    {
+        var pass = new PassBlockModel
+        {
+            Name = StripQuotes(context.STRING_LITERAL().GetText())
+        };
+
+        var passBody = context.passBody();
+        if (passBody != null)
+        {
+            foreach (var definesBlock in passBody.definesBlock())
+            {
+                pass.Defines = (DefinesBlockModel)VisitDefinesBlock(definesBlock);
+            }
+
+            foreach (var includesBlock in passBody.includesBlock())
+            {
+                pass.Includes = (IncludesBlockModel)VisitIncludesBlock(includesBlock);
+            }
+
+            foreach (var keywordsBlock in passBody.keywordsBlock())
+            {
+                pass.Keywords = (KeywordsBlockModel)VisitKeywordsBlock(keywordsBlock);
+            }
+
+            foreach (var pipelineBlock in passBody.pipelineBlock())
+            {
+                pass.LocalPipeline = (PipelineBlockModel)VisitPipelineBlock(pipelineBlock);
+            }
+
+            foreach (var hlslBlock in passBody.hlslBlock())
+            {
+                pass.Hlsl = (HlslBlockModel)VisitHlslBlock(hlslBlock);
+            }
+
+            foreach (var shaderEntry in passBody.shaderEntry())
+            {
+                pass.ShaderEntries.Add((ShaderEntryModel)VisitShaderEntry(shaderEntry));
+            }
+        }
+
+        return pass;
+    }
+
+    public override object VisitDefinesBlock([NotNull] GhostShaderParser.DefinesBlockContext context)
+    {
+        var defines = new DefinesBlockModel();
+
+        foreach (var defineStmt in context.defineStatement())
+        {
+            defines.Defines.Add(defineStmt.IDENTIFIER().GetText());
+        }
+
+        return defines;
+    }
+
+    public override object VisitIncludesBlock([NotNull] GhostShaderParser.IncludesBlockContext context)
+    {
+        var includes = new IncludesBlockModel();
+
+        foreach (var includeStmt in context.includeStatement())
+        {
+            includes.Includes.Add(StripQuotes(includeStmt.STRING_LITERAL().GetText()));
+        }
+
+        return includes;
+    }
+
+    public override object VisitKeywordsBlock([NotNull] GhostShaderParser.KeywordsBlockContext context)
+    {
+        var keywords = new KeywordsBlockModel();
+
+        foreach (var keywordStmt in context.keywordStatement())
+        {
+            var group = new KeywordGroupModel();
+
+            if (keywordStmt.scope() != null)
+            {
+                group.Scope = keywordStmt.scope().GetText();
+            }
+
+            foreach (var identifier in keywordStmt.IDENTIFIER())
+            {
+                group.Keywords.Add(identifier.GetText());
+            }
+
+            keywords.Groups.Add(group);
+        }
+
+        return keywords;
+    }
+
+    public override object VisitHlslBlock([NotNull] GhostShaderParser.HlslBlockContext context)
+    {
+        var hlsl = new HlslBlockModel();
+
+        // Get the text between the braces
+        var start = context.LBRACE().Symbol.StopIndex + 1;
+        var stop = context.RBRACE().Symbol.StartIndex - 1;
+        
+        if (stop >= start)
+        {
+            var input = context.Start.InputStream;
+            hlsl.Code = input.GetText(new Antlr4.Runtime.Misc.Interval(start, stop));
+        }
+
+        return hlsl;
+    }
+
+    public override object VisitShaderEntry([NotNull] GhostShaderParser.ShaderEntryContext context)
+    {
+        var entry = new ShaderEntryModel
+        {
+            EntryType = context.IDENTIFIER().GetText(),
+            ShaderPath = StripQuotes(context.STRING_LITERAL(0).GetText()),
+            EntryPoint = StripQuotes(context.STRING_LITERAL(1).GetText())
+        };
+
+        return entry;
+    }
+
+    public override object VisitFunctionCall([NotNull] GhostShaderParser.FunctionCallContext context)
+    {
+        var funcCall = new FunctionCallModel
+        {
+            Name = context.IDENTIFIER().GetText()
+        };
+
+        if (context.functionArguments() != null)
+        {
+            foreach (var arg in context.functionArguments().functionArgument())
+            {
+                var text = arg.GetText();
+                if (text.StartsWith('"'))
+                {
+                    text = StripQuotes(text);
+                }
+                funcCall.Arguments.Add(text);
+            }
+        }
+
+        return funcCall;
+    }
+
+    private static string StripQuotes(string text)
+    {
+        if (text.Length >= 2 && text.StartsWith('"') && text.EndsWith('"'))
+        {
+            return text.Substring(1, text.Length - 2);
+        }
+        return text;
+    }
+}