public override object Parse(ParserContext context)
{
if (string.IsNullOrWhiteSpace(context.Text))
{
throw new PluginException("Can not parse for the predication because the parser text is empty.");
}
var matches = _regex.Matches(context.Text);
if (matches.Count < 1)
{
throw new PluginException("Can not parse for the predication.");
}
var parts = matches[0].Value.Split('.');
if (parts.Length != 2)
{
throw new PluginException("Can not parse for the predication because of a syntax error.");
}
IPredication predication = null;
if (parts.Length == 1)
{
predication = context.PluginContext.ApplicationContext.ServiceFactory.Default.Resolve(parts[0]) as IPredication;
}
else
{
var serviceProvider = context.PluginContext.ApplicationContext.ServiceFactory.GetProvider(parts[0]);
if (serviceProvider == null)
{
throw new PluginException(string.Format("The '{0}' ServiceProvider is not exists on the predication parsing.", parts[0]));
}
predication = serviceProvider.Resolve(parts[1]) as IPredication;
}
if (predication != null)
{
string text = matches.Count <= 1 ? null : context.Text.Substring(matches[1].Index);
object parameter = text;
if (Zongsoft.Common.TypeExtension.IsAssignableFrom(typeof(IPredication <PluginPredicationContext>), predication.GetType()))
{
parameter = new PluginPredicationContext(text, context.Builtin, context.Node, context.Plugin);
}
return(predication.Predicate(parameter));
}
return(false);
}
public virtual bool CanHandle(IExecutionPipelineContext context)
{
//如果断言对象是空则返回是否可用变量的值
if (_predication == null)
{
return(_enabled);
}
//返回断言对象的断言测试的值
return(_enabled && _predication.Predicate(context));
}