/// <summary>
/// Get the <see cref="ExpressionSyntax"/> for the given parameter.
/// </summary>
/// <param name="parameter">The parameter.</param>
/// <returns>The <see cref="ExpressionSyntax"/>.</returns>
private ExpressionSyntax GetValueFactory(ParameterInfo parameter)
{
var type = parameter.ParameterType;
var context = new RoslynExpressionContext(parameter, ArgumentContext);
if (ValueFactories.TryGetValue(type, out var value))
{
return(value(context));
}
foreach (var valueProvider in _valueProviders)
{
if (!valueProvider.CanProvide(type))
{
continue;
}
foreach (var assembly in valueProvider.GetAssemblies(type))
{
if (!_assemblies.Contains(assembly.Location))
{
_assemblies.Add(assembly.Location);
}
}
return(valueProvider.GetRoslynExpression(context));
}
return(context.GetService(type));
}
public ExpressionSyntax GetRoslynExpression(RoslynExpressionContext context)
{
var manager = context.GetService(typeof(IGuildOptionsManager));
var optionsType = context.ExpectedType.GetGenericArguments()[0];
var typeSyntax = S.ParseTypeName(optionsType.FullName.Replace('+', '.'));
var getName = S.GenericName(nameof(SettingExtensions.GetOptionsAsync)).WithTypeArgumentList(S.TypeArgumentList().AddArguments(typeSyntax));
var get = S.MemberAccessExpression(SyntaxKind.SimpleMemberAccessExpression, manager, getName);
var guildId = S.BinaryExpression(
SyntaxKind.CoalesceExpression,
context.GetRequestProperty(nameof(MessageRequest.GuildId)),
S.ThrowExpression(S.ObjectCreationExpression(
S.IdentifierName("InvalidOperationException"),
S.ArgumentList().AddArguments(S.Argument(S.LiteralExpression(SyntaxKind.StringLiteralExpression, S.Literal(GuildIdNotDefined)))),
null
))
);
var invoke = S.InvocationExpression(get, S.ArgumentList().AddArguments(S.Argument(guildId)));
return(S.AwaitExpression(invoke));
}