/*********
** Private methods
*********/
/// <summary>Try to get a method which matches the given delegate.</summary>
/// <param name="instance">The token value provider.</param>
/// <param name="name">The method name on <see cref="ConventionWrapper"/> being mapped.</param>
/// <param name="methodDelegate">The created method delegate, if any.</param>
/// <param name="error">The error indicating why creating the wrapper failed, if applicable.</param>
private static bool TryWrapMethod <TDelegate>(object instance, string name, out TDelegate methodDelegate, out string error)
where TDelegate : Delegate
{
methodDelegate = null;
error = null;
// check target method exists
{
MethodInfo[] candidates = instance.GetType().GetMethods().Where(p => p.Name == name).ToArray();
if (candidates.Length == 0)
{
return(false);
}
if (candidates.Length > 1)
{
return(Fail($"method {name} has multiple implementations.", out error));
}
}
// map to delegate
try
{
methodDelegate = (TDelegate)Delegate.CreateDelegate(typeof(TDelegate), instance, name);
error = null;
return(true);
}
catch (ArgumentException ex)
{
methodDelegate = null;
return(Fail(ConventionWrapper.GetMethodMismatchError(instance, name, ex), out error));
}
}
/*********
** Public methods
*********/
/// <summary>Try to create a convention wrapper for a given token instance.</summary>
/// <param name="instance">The token instance.</param>
/// <param name="reflection">Simplifies access to private code.</param>
/// <param name="wrapper">The wrapper, if created successfully.</param>
/// <param name="error">The error indicating why creating the wrapper failed, if applicable.</param>
public static bool TryCreate(object instance, IReflectionHelper reflection, [NotNullWhen(true)] out ConventionWrapper?wrapper, [NotNullWhen(false)] out string?error)
{
error = null;
var result = new ConventionWrapper();
// Map a delegate type to a token method and wrapper field by convention.
// This assumes the delegate type name matches the method name, and the wrapper has a
// field of the delegate type in the form {name}Impl.
bool TryMap <TDelegate>([NotNullWhen(false)] out string?mapError) where TDelegate : Delegate
/*********
** Public methods
*********/
/// <summary>Try to create a convention wrapper for a given token instance.</summary>
/// <param name="instance">The token instance.</param>
/// <param name="reflection">Simplifies access to private code.</param>
/// <param name="wrapper">The wrapper, if created successfully.</param>
/// <param name="error">The error indicating why creating the wrapper failed, if applicable.</param>
public static bool TryCreate(object instance, IReflectionHelper reflection, out ConventionWrapper wrapper, out string error)
{
error = null;
var result = new ConventionWrapper();
// Map a delegate type to a token method and wrapper field by convention.
// This assumes the delegate type name matches the method name, and the wrapper has a
// field of the delegate type in the form {name}Impl.
bool TryMap <TDelegate>(out string mapError) where TDelegate : Delegate
{
string methodName = typeof(TDelegate).Name;
string fieldName = $"{methodName}Impl";
if (ConventionWrapper.TryWrapMethod(instance, methodName, out TDelegate mapped, out mapError))
{
reflection.GetField <TDelegate>(result, fieldName).SetValue(mapped);
}
return(mapError == null);
}
// detect unknown methods
bool succeeded = true;
{
string[] unknownMethods =
(
from MethodInfo method in instance.GetType().GetMethods()
where typeof(ConventionWrapper).GetMethod(method.Name) == null
select method.Name
)
.ToArray();
if (unknownMethods.Any())
{
succeeded = false;
error = unknownMethods.Length == 1
? $"found unsupported '{unknownMethods[0]}' method"
: $"found unsupported methods: {string.Join(", ", unknownMethods)}";
}
}
// map implemented fields
if (succeeded)
{
succeeded =
// metadata
TryMap <ConventionDelegates.IsMutable>(out error) &&
TryMap <ConventionDelegates.AllowsInput>(out error) &&
TryMap <ConventionDelegates.RequiresInput>(out error) &&
TryMap <ConventionDelegates.CanHaveMultipleValues>(out error) &&
TryMap <ConventionDelegates.GetValidInputs>(out error) &&
TryMap <ConventionDelegates.HasBoundedValues>(out error) &&
TryMap <ConventionDelegates.HasBoundedRangeValues>(out error) &&
TryMap <ConventionDelegates.TryValidateInput>(out error) &&
TryMap <ConventionDelegates.TryValidateValues>(out error) &&
TryMap <ConventionDelegates.NormalizeValue>(out error)
// state
&& TryMap <ConventionDelegates.IsReady>(out error) &&
TryMap <ConventionDelegates.GetValues>(out error) &&
TryMap <ConventionDelegates.UpdateContext>(out error);
}
wrapper = succeeded ? result : null;
return(succeeded);
}
/*********
** Public methods
*********/
/// <summary>Construct an instance.</summary>
/// <param name="name">The token name. This only needs to be unique for your mod; Content Patcher will prefix it with your mod ID automatically, like <c>Pathoschild.ExampleMod/SomeTokenName</c>.</param>
/// <param name="provider">The mod-provided value provider.</param>
public ConventionValueProvider(string name, ConventionWrapper provider)
{
this.Name = name;
this.Provider = provider;
this.IsReady = provider.IsReady();
}
