private static void Render(ConditionalAttributePiece source, CSharpRenderingContext context)
{
const string ValueWriterName = "__razor_attribute_value_writer";
var expressionValue = source.Value.Children.First() as RenderExpression;
var linePragma = expressionValue != null?context.Writer.BuildLinePragma(source.DocumentLocation) : null;
var prefixLocation = source.DocumentLocation.AbsoluteIndex;
var valueLocation = source.DocumentLocation.AbsoluteIndex + source.Prefix.Length;
var valueLength = source.DocumentLocation.ContentLength - source.Prefix.Length;
var renderingConventions = context.GetRenderingConventions();
renderingConventions
.StartWriteAttributeValueMethod()
.WriteStringLiteral(source.Prefix)
.WriteParameterSeparator()
.Write(prefixLocation.ToString(CultureInfo.InvariantCulture))
.WriteParameterSeparator();
if (expressionValue != null)
{
Debug.Assert(source.Value.Children.Count == 1);
RenderExpressionInline(expressionValue.Expression, context);
}
else
{
// Not an expression; need to buffer the result.
context.Writer.WriteStartNewObject(context.CodeLiterals.TemplateTypeName);
var redirectConventions = new CSharpRedirectRenderingConventions(ValueWriterName, context);
using (context.UseRenderingConventions(redirectConventions))
using (context.Writer.BuildAsyncLambda(endLine: false, parameterNames: ValueWriterName))
{
context.Render(source.Value.Children);
}
context.Writer.WriteEndMethodInvocation(false);
}
context.Writer
.WriteParameterSeparator()
.Write(valueLocation.ToString(CultureInfo.InvariantCulture))
.WriteParameterSeparator()
.Write(valueLength.ToString(CultureInfo.InvariantCulture))
.WriteParameterSeparator()
.WriteBooleanLiteral(false)
.WriteEndMethodInvocation();
linePragma?.Dispose();
}
private void Render(ConditionalAttributePiece source, CSharpRenderingContext context)
{
context.Render(source.Value.Children);
}
