public static Func <object, object[], object[]> GetParamsConverter(ClrTypeConverter ctx, ParameterInfo[] methodParameters)
{
if (methodParameters.Length > 0)
{
var lastParameter = methodParameters.Last();
//have a deal with 'param'
if (lastParameter.GetCustomAttribute <ParamArrayAttribute>() != null)
{
return((thisObject, argumentValues) =>
{
if (argumentValues.Length < methodParameters.Length)
{
return ctx.ConvertParametersToClr(methodParameters, thisObject, argumentValues);
}
var part1Types = methodParameters.Take(methodParameters.Length - 1).ToArray();
var clrArgumentsPart1 = ctx.ConvertParametersToClr(part1Types, thisObject, argumentValues);
var part2Types = Enumerable
.Repeat(typeof(object), argumentValues.Length - part1Types.Length)
.ToArray();
var clrArgumentsPart2 = ctx.ConvertParametersToClr(part2Types, thisObject,
argumentValues.Skip(part1Types.Length).ToArray());
var clrArguments = new object[methodParameters.Length];
Array.Copy(clrArgumentsPart1, clrArguments, clrArgumentsPart1.Length);
clrArguments[clrArguments.Length - 1] = clrArgumentsPart2;
return clrArguments;
});
}
var expands = methodParameters
.Select(parameterInfo => parameterInfo.GetCustomAttribute <JsExpandArrayAttribute>() != null)
.ToArray();
var hasExpands = expands.Any(x => x);
if (hasExpands || methodParameters.Any(x => !x.ParameterType.IsValueType))
{
return((thisObject, argumentValues) =>
ctx.ConvertParametersToClr(methodParameters, thisObject, argumentValues));
}
//Simple case with value parameters.
var converters =
methodParameters.Select(x => ctx.GetConverter(x.ParameterType, x.GetDefaultValue()));
return((thisObject, args) => converters.Select((c, i) => c(i < args.Length ? args[i]: null))
.ToArray());
}
return((_, __) => new object[0]);
}
public static object[] ConvertParametersToClr(this ClrTypeConverter ctx, ParameterInfo[] methodParameters,
object thisObject,
object[] argumentValues)
{
var clrArguments = new object[methodParameters.Length];
for (var idx = 0; idx < clrArguments.Length; idx++)
{
var par = methodParameters[idx];
if (idx < argumentValues.Length)
{
//todo: optimize
var expand = par.GetCustomAttribute <JsExpandArrayAttribute>() != null;
var jsArgument = argumentValues[idx];
if (!expand && (par.ParameterType.IsValueType))
{
clrArguments[idx] = ctx.GetConverter(par.ParameterType, par.GetDefaultValue())(jsArgument);
}
else
{
clrArguments[idx] =
ctx.ConvertToClr(
jsArgument,
par.ParameterType,
thisObject,
expand);
}
}
else
{
if (par.GetCustomAttribute <ParamArrayAttribute>() != null)
{
clrArguments[idx] = Activator.CreateInstance(par.ParameterType, 0);
}
else if (par.HasDefaultValue)
{
clrArguments[idx] = par.DefaultValue;
}
}
}
return(clrArguments);
}
