private static void EvaluateSingleTagDirective(
[NotNull] TextWriter writer,
[NotNull] IExpressionEvaluationContext context,
[NotNull] Directive directive,
[NotNull] IReadOnlyList <object> components)
{
/* Pre-evaluate the tag's components, as these */
var tagEvaluatedComponents = EvaluateTag(context, components);
/* Evaluate tag. */
object state = null;
var flowDecision = Directive.FlowDecision.Evaluate;
while (flowDecision != Directive.FlowDecision.Terminate)
{
/* Check for cancellation. */
context.CancellationToken.ThrowIfCancellationRequested();
flowDecision = directive.Execute(0, tagEvaluatedComponents, ref state, context, out string directiveText);
/* Check for cancellation. */
context.CancellationToken.ThrowIfCancellationRequested();
if (directiveText != null)
{
writer.Write(directiveText);
}
}
}
private static void EvaluateTagDirective(
[NotNull] TextWriter writer,
[NotNull] EvaluationContext context,
[NotNull] Directive directive,
[NotNull] IReadOnlyList <object[]> components,
[NotNull] IReadOnlyList <CompiledEvaluationDelegate <EvaluationContext> > evaluationProcs)
{
/* Get tag components. */
var evaluatedComponents = new object[components.Count][];
/* Evaluate tag. */
object state = null;
var currentTagIndex = 0;
while (currentTagIndex >= 0)
{
/* Check for cancellation. */
context.CancellationToken.ThrowIfCancellationRequested();
if (evaluatedComponents[currentTagIndex] == null)
{
evaluatedComponents[currentTagIndex] = EvaluateTag(context, components[currentTagIndex]);
}
var flowDecision = directive.Execute(currentTagIndex, evaluatedComponents[currentTagIndex], ref state, context, out string directiveText);
/* Check for cancellation. */
context.CancellationToken.ThrowIfCancellationRequested();
if (directiveText != null)
{
writer.Write(directiveText);
}
// ReSharper disable once SwitchStatementMissingSomeCases
switch (flowDecision)
{
case Directive.FlowDecision.Terminate:
currentTagIndex = -1;
break;
case Directive.FlowDecision.Restart:
currentTagIndex = 0;
break;
default:
currentTagIndex++;
if (currentTagIndex == components.Count)
{
currentTagIndex = 0;
}
else if (flowDecision == Directive.FlowDecision.Evaluate)
{
evaluationProcs[currentTagIndex - 1]?.Invoke(writer, context);
}
break;
}
}
}
private static void EvaluateDoubleTagDirective(
[NotNull] TextWriter writer,
[NotNull] EvaluationContext context,
[NotNull] Directive directive,
[NotNull] IReadOnlyList <object> beginComponents,
[NotNull] IReadOnlyList <object> closeComponents,
[CanBeNull] CompiledEvaluationDelegate <EvaluationContext> beginToCloseEvaluateProc)
{
/* Get tag components. */
var beginTagEvaluatedComponents = EvaluateTag(context, beginComponents);
object[] closeTagEvaluatedComponents = null;
/* Evaluate tag. */
object state = null;
while (true)
{
/* Check for cancellation. */
context.CancellationToken.ThrowIfCancellationRequested();
var flowDecision = directive.Execute(0, beginTagEvaluatedComponents, ref state, context, out string directiveText);
/* Check for cancellation. */
context.CancellationToken.ThrowIfCancellationRequested();
if (directiveText != null)
{
writer.Write(directiveText);
}
if (flowDecision == Directive.FlowDecision.Terminate)
{
break;
}
switch (flowDecision)
{
case Directive.FlowDecision.Restart:
continue;
case Directive.FlowDecision.Evaluate:
beginToCloseEvaluateProc?.Invoke(writer, context);
break;
case Directive.FlowDecision.Terminate:
break;
case Directive.FlowDecision.Skip:
break;
default:
throw new ArgumentOutOfRangeException(nameof(flowDecision));
}
if (closeTagEvaluatedComponents == null)
{
closeTagEvaluatedComponents = EvaluateTag(context, closeComponents);
}
/* Check for cancellation. */
context.CancellationToken.ThrowIfCancellationRequested();
flowDecision = directive.Execute(1, closeTagEvaluatedComponents, ref state, context, out directiveText);
if (directiveText != null)
{
writer.Write(directiveText);
}
if (flowDecision == Directive.FlowDecision.Terminate)
{
break;
}
}
}