/// <summary>
/// Throw exception.
/// </summary>
/// <param name="ctx"></param>
/// <param name="e">Represents errors that occur during application execution.</param>
/// <param name="tag">Represents errors tag.</param>
/// <param name="writer">See the <see cref="System.IO.TextWriter"/>.</param>
public static async Task ThrowExceptionAsync(this TemplateContext ctx, TemplateException e, ITag tag, System.IO.TextWriter writer)
{
ctx.AddError(e);
if (!ctx.ThrowExceptions)
{
await writer.WriteAsync(tag.ToSource());
}
}
/// <summary>
/// Performs the render for a tags.
/// </summary>
/// <param name="ctx"></param>
/// <param name="writer">See the <see cref="System.IO.TextWriter"/>.</param>
/// <param name="collection">The tags collection.</param>
/// <param name="cancellationToken">See the <see cref="CancellationToken"/>.</param>
public static async Task RenderAsync(this TemplateContext ctx, System.IO.TextWriter writer, ITag[] collection, CancellationToken cancellationToken = default)
{
if (writer == null)
{
throw new ArgumentNullException("\"writer\" cannot be null.");
}
if (collection != null && collection.Length > 0)
{
for (int i = 0; i < collection.Length; i++)
{
try
{
var tagResult = Execute(ctx, collection[i]);
if (tagResult != null)
{
if (tagResult is Task task)
{
var type = tagResult.GetType();
if (type.IsGenericType)
{
var taskResult = (Task <string>) typeof(Utility).CallGenericMethod(null, "ExcuteTaskAsync", type.GetGenericArguments(), tagResult);
var taskValue = await taskResult;
await writer.WriteAsync(taskValue);
}
else
{
await task;
}
continue;
}
await writer.WriteAsync(tagResult.ToString());
}
}
catch (TemplateException e)
{
await ThrowExceptionAsync(ctx, e, collection[i], writer);
}
catch (System.Exception e)
{
var baseException = e.GetBaseException();
await ThrowExceptionAsync(ctx, new ParseException(collection[i], baseException), collection[i], writer);
}
}
}
}
private void write(string title, IList <Diagnostic> errors)
{
if (errors.Count > 0)
{
writer.WriteAsync(errors.Count.ToString());
}
else
{
writer.WriteAsync("No");
}
writer.WriteAsync(" error");
if (errors.Count > 1)
{
writer.WriteAsync('s');
}
writer.WriteAsync(" in \"");
writer.WriteAsync(title);
if (errors.Count > 0)
{
writer.WriteLineAsync("\":");
foreach (var e in errors)
{
writer.WriteLineAsync(e.ToString());
}
}
else
{
writer.WriteLineAsync("\".");
}
}