fix(codegen): Adds codegen for embedded objects and timer fields (#686)

* Adds code genning for embedded objects. See `AquariumState` as an example.
* Adds code genning for fields that are `Timer`. See `Aquarium` as an example.
* Codegens aquariums
* Fixes missing option for most primitive field types.

Projects/SerializationGenerator/SerializableMigration/Rules/TimerMigrationRule.cs

@@ -0,0 +1,125 @@
+/*************************************************************************
+ * ModernUO                                                              *
+ * Copyright 2019-2021 - ModernUO Development Team                       *
+ * Email: hi@modernuo.com                                                *
+ * File: TimerMigrationRule.cs                                           *
+ *                                                                       *
+ * This program is free software: you can redistribute it and/or modify  *
+ * it under the terms of the GNU General Public License as published by  *
+ * the Free Software Foundation, either version 3 of the License, or     *
+ * (at your option) any later version.                                   *
+ *                                                                       *
+ * You should have received a copy of the GNU General Public License     *
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>. *
+ *************************************************************************/
+
+using System;
+using System.Collections.Immutable;
+using System.Linq;
+using System.Text;
+using Microsoft.CodeAnalysis;
+using SerializationGenerator;
+
+namespace SerializableMigration
+{
+    public class TimerMigrationRule : ISerializableMigrationRule, IPostDeserializeMethod
+    {
+        public string RuleName => nameof(TimerMigrationRule);
+
+        public bool GenerateRuleState(
+            Compilation compilation,
+            ISymbol symbol,
+            ImmutableArray<AttributeData> attributes,
+            ImmutableArray<INamedTypeSymbol> serializableTypes,
+            ImmutableArray<INamedTypeSymbol> embeddedSerializableTypes,
+            ISymbol? parentSymbol,
+            out string[] ruleArguments
+        )
+        {
+            if (!(symbol is ITypeSymbol typeSymbol && typeSymbol.IsTimer(compilation)))
+            {
+                ruleArguments = null;
+                return false;
+            }
+
+            ruleArguments = attributes.Any(a => a.IsTimerDrift(compilation))
+                ? new[] { "@TimerDrift" }
+                : new[] { "" };
+
+            return true;
+        }
+
+        public void GenerateDeserializationMethod(StringBuilder source, string indent, SerializableProperty property)
+        {
+            var expectedRule = RuleName;
+            var ruleName = property.Rule;
+            if (expectedRule != ruleName)
+            {
+                throw new ArgumentException($"Invalid rule applied to property {ruleName}. Expecting {expectedRule}, but received {ruleName}.");
+            }
+
+            var propertyName = property.Name;
+            var ruleArguments = property.RuleArguments;
+            var driftTimer = ruleArguments[0].Contains("@TimerDrift");
+
+            var readTimer = driftTimer ? "reader.ReadDeltaTime()" : "reader.ReadDateTime()";
+            source.AppendLine($"{indent}var {propertyName}Delay = {readTimer} - Core.Now;");
+        }
+
+        public void GenerateSerializationMethod(StringBuilder source, string indent, SerializableProperty property)
+        {
+            var expectedRule = RuleName;
+            var ruleName = property.Rule;
+            if (expectedRule != ruleName)
+            {
+                throw new ArgumentException($"Invalid rule applied to property {ruleName}. Expecting {expectedRule}, but received {ruleName}.");
+            }
+
+            var propertyName = property.Name;
+            var ruleArguments = property.RuleArguments;
+            var driftTimer = ruleArguments[0].Contains("@TimerDrift");
+
+            var writerMethod = driftTimer ? "WriteDeltaTime" : "Write";
+            source.AppendLine($"{indent}writer.{writerMethod}({propertyName}.Next);");
+        }
+
+        public void PostDeserializeMethod(
+            StringBuilder source, string indent, SerializableProperty property, Compilation compilation, INamedTypeSymbol classSymbol
+        )
+        {
+            var deserializeTimerMethod = classSymbol
+                .GetMembers()
+                .OfType<IMethodSymbol>()
+                .FirstOrDefault(
+                    m =>
+                    {
+                        if (!m.ReturnsVoid || m.Parameters.Length != 1 || !m.Parameters[0].Type.IsTimeSpan(compilation))
+                        {
+                            return false;
+                        }
+
+                        return m.GetAttributes()
+                            .FirstOrDefault(
+                                attr =>
+                                {
+                                    if (!SymbolEqualityComparer.Default.Equals(
+                                        attr.AttributeClass,
+                                        compilation.GetTypeByMetadataName(
+                                            SymbolMetadata.DESERIALIZE_TIMER_FIELD_ATTRIBUTE
+                                        )
+                                    ))
+                                    {
+                                        return false;
+                                    }
+
+                                    var order = (int)attr.ConstructorArguments[0].Value!;
+                                    return order == property.Order;
+                                }
+                            ) != null;
+                    }
+                ) ?? throw new Exception("Serializing a timer requires a method with the DeserializeTimerField attribute to handle creating the timer itself.");
+
+            source.AppendLine($"{indent}{deserializeTimerMethod.Name}({property.Name}Delay);");
+        }
+    }
+}