first commit

NitroxPatcher/PatternMatching/OperandPattern.cs

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+using System;
+using System.Reflection;
+using JetBrains.Annotations;
+
+namespace NitroxPatcher.PatternMatching;
+
+public readonly record struct OperandPattern(string DeclaringClassName, string MemberName, Type[] ArgumentTypes = null)
+{
+    public bool IsAny => this == default;
+    public bool IsAnyArguments => ArgumentTypes == null;
+
+    public static bool operator ==(OperandPattern pattern, [CanBeNull] object operand)
+    {
+        if (pattern.IsAny)
+        {
+            return true;
+        }
+        if (operand is MemberInfo member)
+        {
+            if (!pattern.DeclaringClassName.Equals(member.DeclaringType?.FullName, StringComparison.OrdinalIgnoreCase) || !pattern.MemberName.Equals(member.Name, StringComparison.OrdinalIgnoreCase))
+            {
+                return false;
+            }
+            if (member is MethodInfo method)
+            {
+                if (pattern.IsAnyArguments)
+                {
+                    return true;
+                }
+
+                ParameterInfo[] parameters = method.GetParameters();
+                if (parameters.Length == pattern.ArgumentTypes.Length)
+                {
+                    for (int i = 0; i < parameters.Length; i++)
+                    {
+                        if (!parameters[i].ParameterType.IsAssignableFrom(pattern.ArgumentTypes[i]))
+                        {
+                            return false;
+                        }
+                    }
+                    return true;
+                }
+            }
+            else
+            {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    public static bool operator !=(OperandPattern pattern, object operand)
+    {
+        return !(pattern == operand);
+    }
+
+    public override string ToString() => $"{DeclaringClassName}{(MemberName == null ? "" : $".{MemberName}")}";
+}