/// <summary>
/// Register the filters implemented by the provided System.Type entries so they can be used to resolve templates.
/// </summary>
/// <param name="implementingType"></param>
/// <param name="filterName"></param>
protected override void OnRegisterFilter(MethodInfo filterMethodInfo, string filterName)
{
// Define the DotLiquid-compatible function that will wrap the Lava filter.
// When the wrapper function is executed by DotLiquid, it performs some necessary pre-processing before executing the Lava filter.
Func <Context, List <object>, object> filterFunctionWrapper = (Context context, List <object> args) =>
{
var parameterInfos = filterMethodInfo.GetParameters();
filterName = filterName ?? filterMethodInfo.Name;
GetLavaFilterCompatibleArguments(filterName, args, parameterInfos, context);
// Execute the static filter function and return the result.
var result = filterMethodInfo.Invoke(null, args.ToArray());
return(result);
};
// Register the filter with DotLiquid.
Strainer.RegisterFilter(filterName, filterFunctionWrapper);
}
/// <summary>
/// Register the filters implemented by the provided System.Type entries so they can be used to resolve templates.
/// </summary>
/// <param name="implementingType"></param>
protected override void OnRegisterFilters(Type implementingType)
{
var methodsGroupedByName = implementingType.GetMethods(BindingFlags.Public | BindingFlags.Static).AsQueryable().GroupBy(k => k.Name, v => v);
foreach (var methodGroup in methodsGroupedByName)
{
var filterName = methodGroup.Key;
var filterMethodInfos = methodGroup.OrderBy(m => m.GetParameters().Length).ToList();
// Define the DotLiquid-compatible function that will wrap the Lava filter.
// When the wrapper function is executed by DotLiquid, it performs some necessary pre-processing before executing the Lava filter.
Func <Context, List <object>, object> filterFunctionWrapper = (Context context, List <object> args) =>
{
// Get the filter method that best matches the provided argument list.
MethodInfo filterMethodInfo = null;
if (filterMethodInfos.Count == 1)
{
filterMethodInfo = filterMethodInfos.First();
}
else
{
// Find the method that best matches the provided list of arguments.
filterMethodInfo = GetMatchedFilterFunction(filterMethodInfos, args.Count);
}
var parameterInfos = filterMethodInfo.GetParameters();
GetLavaFilterCompatibleArguments(filterName, args, parameterInfos, context);
// Execute the static filter function and return the result.
var result = filterMethodInfo.Invoke(null, args.ToArray());
return(result);
};
// Register the set of filters for each method name.
Strainer.RegisterFilter(methodGroup.Key, filterFunctionWrapper);
}
}
