nearly done

src/LibProtodec/Loaders/LuaSourceLoader.cs

@@ -35,7 +35,8 @@ public sealed class LuaSourceLoader
 
         return LuaSyntaxTree.ParseText(
             SourceText.From(fileStream),
-            null, // TODO: maybe expose the options parameter
+            null, // TODO: maybe expose this as a parameter
             Path.GetFileName(filePath));
+        //TODO: consider checking lua source validity via SyntaxTree.GetDiagnostics()
     }
 }

src/LibProtodec/LoggerMessages.cs

@@ -15,6 +15,9 @@ internal static partial class LoggerMessages
     [LoggerMessage(Level = LogLevel.Warning, Message = "Failed to locate corresponding id field; likely stripped or otherwise obfuscated.")]
     internal static partial void LogFailedToLocateIdField(this ILogger logger);
 
+    [LoggerMessage(Level = LogLevel.Warning, Message = "{msg} is not yet implemented. Open an issue if this is something you need.")]
+    internal static partial void LogNotImplemented(this ILogger logger, string msg);
+
     [LoggerMessage(Level = LogLevel.Information, Message = "Loaded {typeCount} types from {assemblyCount} assemblies for parsing.")]
     internal static partial void LogLoadedTypeAndAssemblyCount(this ILogger logger, int typeCount, int assemblyCount);
 

src/LibProtodec/Models/Protobuf/Fields/EnumField.cs

@@ -4,17 +4,21 @@
 // License, v. 2.0. If a copy of the MPL was not distributed with this
 // file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
+using CommunityToolkit.Diagnostics;
+
 namespace LibProtodec.Models.Protobuf.Fields;
 
 public sealed class EnumField
 {
-    public required string Name { get; init; }
-    public required int    Id   { get; init; }
+    public string? Name { get; set; }
+    public int     Id   { get; set; }
 
     public bool IsObsolete { get; init; }
 
     public void WriteTo(System.IO.TextWriter writer)
     {
+        Guard.IsNotNull(Name);
+
         writer.Write(Name);
         writer.Write(" = ");
         writer.Write(Id);

src/LibProtodec/Models/Protobuf/Fields/MessageField.cs

@@ -5,29 +5,43 @@
 // file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
 using System.IO;
+using CommunityToolkit.Diagnostics;
 using LibProtodec.Models.Protobuf.TopLevels;
 using LibProtodec.Models.Protobuf.Types;
 
 namespace LibProtodec.Models.Protobuf.Fields;
 
-public sealed class MessageField(Message declaringMessage)
+public sealed class MessageField
 {
     public required IProtobufType Type { get; init; }
-    public required string        Name { get; init; }
-    public required int           Id   { get; init; }
+    public Message? DeclaringMessage { get; set; }
 
+    public string? Name { get; set; }
+    public int     Id   { get; set; }
+
+    public bool IsOptional { get; set;  }
+    public bool IsRequired { get; set;  }
     public bool IsObsolete { get; init; }
     public bool HasHasProp { get; init; }
 
     public void WriteTo(TextWriter writer, bool isOneOf)
     {
-        if (HasHasProp && !isOneOf && Type is not Repeated)
+        Guard.IsNotNull(Type);
+        Guard.IsNotNull(Name);
+        Guard.IsNotNull(DeclaringMessage);
+
+        if (IsOptional || (HasHasProp && !isOneOf && Type is not Repeated))
         {
             writer.Write("optional ");
         }
 
+        if (IsRequired)
+        {
+            writer.Write("required ");
+        }
+
         writer.Write(
-            declaringMessage.QualifyTypeName(Type));
+            DeclaringMessage.QualifyTypeName(Type));
         writer.Write(' ');
         writer.Write(Name);
         writer.Write(" = ");

src/LibProtodec/Models/Protobuf/Protobuf.cs

@@ -8,23 +8,39 @@ using System.CodeDom.Compiler;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
+using CommunityToolkit.Diagnostics;
 using LibProtodec.Models.Protobuf.TopLevels;
 
 namespace LibProtodec.Models.Protobuf;
 
 public sealed class Protobuf
 {
+    private int _version = 3;
     private string? _fileName;
     private HashSet<string>? _imports;
 
     public readonly List<TopLevel> TopLevels = [];
 
-    public string? Edition      { get; set;  }
     public string? AssemblyName { get; init; }
-    public string? Namespace    { get; init; }
+    public string? SourceName   { get; init; }
+    public string? Edition      { get; set;  }
+    public string? CilNamespace { get; init; }
 
-    public string FileName =>
-        _fileName ??= $"{string.Join('_', TopLevels.Select(static topLevel => topLevel.Name))}.proto";
+    public string FileName
+    {
+        get => _fileName ??= $"{string.Join('_', TopLevels.Select(static topLevel => topLevel.Name))}.proto";
+        set => _fileName = value;
+    }
+
+    public int Version
+    {
+        get => _version;
+        set
+        {
+            Guard.IsBetweenOrEqualTo(value, 2, 3);
+            _version = value;
+        }
+    }
 
     public HashSet<string> Imports =>
         _imports ??= [];
@@ -39,10 +55,16 @@ public sealed class Protobuf
             writer.WriteLine(AssemblyName);
         }
 
+        if (SourceName is not null)
+        {
+            writer.Write("// Source: ");
+            writer.WriteLine(SourceName);
+        }
+
         writer.WriteLine();
         writer.WriteLine(
             Edition is null
-                ? """syntax = "proto3";"""
+                ? $"""syntax = "proto{Version}";"""
                 : $"""edition = "{Edition}";""");
 
         if (_imports is not null)
@@ -57,10 +79,10 @@ public sealed class Protobuf
             }
         }
 
-        if (Namespace is not null)
+        if (CilNamespace is not null)
         {
             writer.WriteLine();
-            WriteOptionTo(writer, "csharp_namespace", Namespace, true);
+            WriteOptionTo(writer, "csharp_namespace", CilNamespace, true);
         }
 
         foreach (TopLevel topLevel in TopLevels)

src/LibProtodec/Models/Protobuf/TopLevels/TopLevel.cs

@@ -12,7 +12,7 @@ namespace LibProtodec.Models.Protobuf.TopLevels;
 
 public abstract class TopLevel
 {
-    public required string Name { get; init; }
+    public required string Name { get; set; }
 
     public bool      IsObsolete { get; init; }
     public Protobuf? Protobuf   { get; set;  }

src/LibProtodec/Models/Protobuf/Types/Descriptor.cs

@@ -0,0 +1,54 @@
+// Copyright © 2024 Xpl0itR
+// 
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+using CommunityToolkit.Diagnostics;
+using LibProtodec.Models.Protobuf.TopLevels;
+
+namespace LibProtodec.Models.Protobuf.Types;
+
+public sealed class Descriptor : IProtobufType
+{
+    public int TypeIndex { get; set; }
+    public bool IsRepeated { get; set; }
+    public /*TopLevel*/IProtobufType? TopLevelType { get; set; }
+
+    public string Name =>
+        Type.Name;
+
+    public IProtobufType Type
+    {
+        get
+        {
+            IProtobufType type = TopLevelType as IProtobufType ?? TypeIndex switch
+            {
+                1  => Scalar.Double,
+                2  => Scalar.Float,
+                3  => Scalar.Int64,
+                4  => Scalar.UInt64,
+                5  => Scalar.Int32,
+                6  => Scalar.Fixed64,
+                7  => Scalar.Fixed32,
+                8  => Scalar.Bool,
+                9  => Scalar.String,
+                10 => ThrowHelper.ThrowNotSupportedException<IProtobufType>("Parsing proto2 groups are not supported. Open an issue if you need this."),
+                12 => Scalar.Bytes,
+                13 => Scalar.UInt32,
+                15 => Scalar.SFixed32,
+                16 => Scalar.SFixed64,
+                17 => Scalar.SInt32,
+                18 => Scalar.SInt64,
+                _ => ThrowHelper.ThrowArgumentOutOfRangeException<IProtobufType>()
+            };
+
+            if (IsRepeated)
+            {
+                type = new Repeated(type);
+            }
+
+            return type;
+        }
+    }
+}

src/LibProtodec/ProtodecContext.Lua.cs

@@ -4,15 +4,222 @@
 // License, v. 2.0. If a copy of the MPL was not distributed with this
 // file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using CommunityToolkit.Diagnostics;
+using LibProtodec.Models.Protobuf;
+using LibProtodec.Models.Protobuf.Fields;
+using LibProtodec.Models.Protobuf.TopLevels;
+using LibProtodec.Models.Protobuf.Types;
 using Loretta.CodeAnalysis;
+using Loretta.CodeAnalysis.Lua.Syntax;
+using SystemEx;
 
 namespace LibProtodec;
 
 partial class ProtodecContext
 {
-    public void ParseLuaSyntaxTree(SyntaxTree ast)
+    public Protobuf ParseLuaSyntaxTree(SyntaxTree ast)
     {
-        throw new NotImplementedException();
+        CompilationUnitSyntax root = (CompilationUnitSyntax)ast.GetRoot();
+        SyntaxList<StatementSyntax> statements = root.Statements.Statements;
+
+        bool importedProtobufLib = false;
+        Dictionary<string, object> pbTable = [];
+        Protobuf protobuf = new()
+        {
+            Version    = 2,
+            SourceName = ast.FilePath
+        };
+
+        foreach (StatementSyntax statement in statements)
+        {
+            switch (statement)
+            {
+                case LocalVariableDeclarationStatementSyntax
+                {
+                    EqualsValues.Values: [FunctionCallExpressionSyntax { Expression: IdentifierNameSyntax { Name: "require" } } call]
+                }:
+                    switch (call.Argument)
+                    {
+                        case StringFunctionArgumentSyntax { Expression.Token.ValueText: "protobuf/protobuf" }:
+                            importedProtobufLib = true;
+                            break;
+                        case ExpressionListFunctionArgumentSyntax { Expressions: [LiteralExpressionSyntax { Token.ValueText: {} import }] }:
+                            import = Path.GetFileNameWithoutExtension(import).TrimEnd("_pb"); //todo: handle imports properly
+                            protobuf.Imports.Add($"{import}.proto");
+                            break;
+                    }
+                    break;
+                case AssignmentStatementSyntax
+                {
+                    Variables: [MemberAccessExpressionSyntax
+                    {
+                        Expression: IdentifierNameSyntax,
+                        MemberName.ValueText: {} tableKey
+                    }],
+                    EqualsValues.Values: [FunctionCallExpressionSyntax { Expression: MemberAccessExpressionSyntax { MemberName.ValueText: {} factory } }]
+                }:
+                    switch (factory)
+                    {
+                        case "Descriptor":
+                            Message message = new()
+                            {
+                                Name     = tableKey,
+                                Protobuf = protobuf
+                            };
+                            protobuf.TopLevels.Add(message);
+                            pbTable.Add(tableKey, message);
+                            break;
+                        case "EnumDescriptor":
+                            Enum @enum = new()
+                            {
+                                Name     = tableKey,
+                                Protobuf = protobuf
+                            };
+                            protobuf.TopLevels.Add(@enum);
+                            pbTable.Add(tableKey, @enum);
+                            break;
+                        case "FieldDescriptor":
+                            pbTable.Add(tableKey, new MessageField { Type = new Descriptor() });
+                            break;
+                        case "EnumValueDescriptor":
+                            pbTable.Add(tableKey, new EnumField());
+                            break;
+                    }
+                    break;
+                case AssignmentStatementSyntax
+                {
+                    Variables: [MemberAccessExpressionSyntax
+                    {
+                        Expression: MemberAccessExpressionSyntax { MemberName.ValueText: {} tableKey },
+                        MemberName.ValueText: { } memberName
+                    }],
+                    EqualsValues.Values: [{ } valueExpr]
+                }:
+                    var valueTableElements =
+                        (valueExpr as TableConstructorExpressionSyntax)?.Fields
+                        .Cast<UnkeyedTableFieldSyntax>()
+                        .Select(static element => element.Value);
+                    object? valueLiteral = (valueExpr as LiteralExpressionSyntax)?.Token.Value;
+
+                    switch (pbTable[tableKey])
+                    {
+                        case Message message:
+                            switch (memberName)
+                            {
+                                case "name":
+                                    message.Name = (string)valueLiteral!;
+                                    break;
+                                case "fields":
+                                    foreach (MessageField messageField in valueTableElements!
+                                                 .Cast<MemberAccessExpressionSyntax>()
+                                                 .Select(x => pbTable[x.MemberName.ValueText])
+                                                 .Cast<MessageField>())
+                                    {
+                                        messageField.DeclaringMessage = message;
+                                        message.Fields.Add(messageField.Id, messageField);
+                                    }
+                                    break;
+                                case "nested_types":
+                                    if (valueTableElements!.Any())
+                                        Logger?.LogNotImplemented("Parsing nested messages from lua");
+                                    break;
+                                case "enum_types":
+                                    if (valueTableElements!.Any())
+                                        Logger?.LogNotImplemented("Parsing nested enums from lua");
+                                    break;
+                                case "is_extendable":
+                                    if ((bool)valueLiteral!)
+                                        Logger?.LogNotImplemented("Parsing message extensions from lua");
+                                    break;
+                            }
+                            break;
+                        case Enum @enum:
+                            switch (memberName)
+                            {
+                                case "name":
+                                    @enum.Name = (string)valueLiteral!;
+                                    break;
+                                case "values":
+                                    @enum.Fields.AddRange(
+                                        valueTableElements!
+                                            .Cast<MemberAccessExpressionSyntax>()
+                                            .Select(x => pbTable[x.MemberName.ValueText])
+                                            .Cast<EnumField>());
+                                    break;
+                            }
+                            break;
+                        case MessageField messageField:
+                            Descriptor descriptor = (Descriptor)messageField.Type;
+                            switch (memberName)
+                            {
+                                case "name":
+                                    messageField.Name = (string)valueLiteral!;
+                                    break;
+                                case "number":
+                                    messageField.Id = (int)(double)valueLiteral!;
+                                    break;
+                                case "label":
+                                    switch ((int)(double)valueLiteral!)
+                                    {
+                                        case 1:
+                                            messageField.IsOptional = true;
+                                            break;
+                                        case 2:
+                                            messageField.IsRequired = true;
+                                            break;
+                                        case 3:
+                                            descriptor.IsRepeated = true;
+                                            break;
+                                    }
+                                    break;
+                                case "type":
+                                    descriptor.TypeIndex = (int)(double)valueLiteral!;
+                                    break;
+                                case "message_type":
+                                case "enum_type":
+                                    string typeTableKey = ((MemberAccessExpressionSyntax)valueExpr).MemberName.ValueText;
+                                    if (pbTable.TryGetValue(typeTableKey, out object? topLevel)) //TODO: if this is false, then the top level is from an import, we will need to handle this
+                                        descriptor.TopLevelType = (IProtobufType)topLevel;
+                                    else
+                                        descriptor.TopLevelType = new Scalar(typeTableKey); // temporary hack
+                                    break;
+                                case "has_default_value":
+                                    if ((bool)valueLiteral!)
+                                        Logger?.LogNotImplemented("Parsing default field values from lua");
+                                    break;
+                            }
+                            break;
+                        case EnumField enumField:
+                            switch (memberName)
+                            {
+                                case "name":
+                                    enumField.Name = (string)valueLiteral!;
+                                    break;
+                                case "number" when valueExpr is UnaryExpressionSyntax { Operand: LiteralExpressionSyntax { Token.Value: { } negativeNumber } }:
+                                    enumField.Id = -(int)(double)negativeNumber;
+                                    break;
+                                case "number":
+                                    enumField.Id = (int)(double)valueLiteral!;
+                                    break;
+                            }
+                            break;
+                    }
+                    break;
+                case ReturnStatementSyntax { Expressions: [IdentifierNameSyntax identifier] }:
+                    protobuf.FileName = $"{identifier.Name.TrimEnd("_pbTable")}.proto";
+                    break;
+            }
+        }
+
+        if (!importedProtobufLib)
+        {
+            ThrowHelper.ThrowInvalidDataException();
+        }
+
+        this.Protobufs.Add(protobuf);
+        return protobuf;
     }
 }

src/LibProtodec/ProtodecContext.cs

@@ -38,8 +38,6 @@ public partial class ProtodecContext
     {
         writer.WriteLine("// Decompiled with protodec");
         writer.WriteLine();
-        writer.WriteLine("""syntax = "proto3";""");
-        writer.WriteLine();
 
         foreach (TopLevel topLevel in Protobufs.SelectMany(static proto => proto.TopLevels))
         {
@@ -119,13 +117,14 @@ public partial class ProtodecContext
                 continue;
             }
 
-            MessageField field = new(message)
+            MessageField field = new()
             {
                 Type       = ParseFieldType(propertyType, options, protobuf),
                 Name       = TranslateMessageFieldName(property.Name),
                 Id         = (int)idFields[fi].ConstantValue!,
                 IsObsolete = HasObsoleteAttribute(property.CustomAttributes),
-                HasHasProp = msgFieldHasHasProp
+                HasHasProp = msgFieldHasHasProp,
+                DeclaringMessage = message
             };
 
             Logger?.LogParsedField(field.Name, field.Id, field.Type.Name);
@@ -499,7 +498,7 @@ public partial class ProtodecContext
         Protobuf protobuf = new()
         {
             AssemblyName = topLevelType.DeclaringAssemblyName,
-            Namespace    = topLevelType.Namespace
+            CilNamespace = topLevelType.Namespace
         };
 
         topLevel.Protobuf = protobuf;