protected override void Visit(TagHelperChunk chunk)
{
// We only want to setup tag helper manager fields if there are tag helpers, and only once
if (!_foundTagHelpers)
{
_foundTagHelpers = true;
// We want to hide declared TagHelper fields so they cannot be stepped over via a debugger.
Writer.WriteLineHiddenDirective();
// Runtime fields aren't useful during design time.
if (!Context.Host.DesignTimeMode)
{
// Need to disable the warning "X is assigned to but never used." for the value buffer since
// whether it's used depends on how a TagHelper is used.
Writer.WritePragma("warning disable 0414");
WritePrivateField(_tagHelperContext.TagHelperContentTypeName,
CSharpTagHelperCodeRenderer.StringValueBufferVariableName,
value: null);
Writer.WritePragma("warning restore 0414");
WritePrivateField(_tagHelperContext.ExecutionContextTypeName,
CSharpTagHelperCodeRenderer.ExecutionContextVariableName,
value: null);
Writer
.Write("private ")
.WriteVariableDeclaration(
_tagHelperContext.RunnerTypeName,
CSharpTagHelperCodeRenderer.RunnerVariableName,
value: null);
Writer.Write("private ")
.Write(_tagHelperContext.ScopeManagerTypeName)
.Write(" ")
.WriteStartAssignment(CSharpTagHelperCodeRenderer.ScopeManagerVariableName)
.WriteStartNewObject(_tagHelperContext.ScopeManagerTypeName)
.WriteEndMethodInvocation();
}
}
foreach (var descriptor in chunk.Descriptors)
{
if (!_declaredTagHelpers.Contains(descriptor.TypeName))
{
_declaredTagHelpers.Add(descriptor.TypeName);
WritePrivateField(descriptor.TypeName,
CSharpTagHelperCodeRenderer.GetVariableName(descriptor),
value: null);
}
}
// We need to dive deeper to ensure we pick up any nested tag helpers.
Accept(chunk.Children);
}
public CSharpLiteralCodeVisitor(
CSharpTagHelperCodeRenderer tagHelperRenderer,
CSharpCodeWriter writer,
CodeBuilderContext context)
: base(writer, context)
{
// Ensure that no matter how this class is used, we don't create numerous CSharpTagHelperCodeRenderer
// instances.
TagHelperRenderer = tagHelperRenderer;
}
protected override void Visit(TagHelperChunk chunk)
{
// We only want to setup tag helper manager fields if there are tag helpers, and only once
if (!_foundTagHelpers)
{
_foundTagHelpers = true;
// We want to hide declared TagHelper fields so they cannot be stepped over via a debugger.
Writer.WriteLineHiddenDirective();
// Runtime fields aren't useful during design time.
if (!Context.Host.DesignTimeMode)
{
WritePrivateField(typeof(TextWriter).FullName,
CSharpTagHelperCodeRenderer.StringValueBufferVariableName,
value: null);
WritePrivateField(_tagHelperContext.ExecutionContextTypeName,
CSharpTagHelperCodeRenderer.ExecutionContextVariableName,
value: null);
WritePrivateField(_tagHelperContext.RunnerTypeName,
CSharpTagHelperCodeRenderer.RunnerVariableName,
"new " + _tagHelperContext.RunnerTypeName + "()");
WritePrivateField(_tagHelperContext.ScopeManagerTypeName,
CSharpTagHelperCodeRenderer.ScopeManagerVariableName,
"new " + _tagHelperContext.ScopeManagerTypeName + "()");
}
}
foreach (var descriptor in chunk.Descriptors)
{
if (!_declaredTagHelpers.Contains(descriptor.TypeName))
{
_declaredTagHelpers.Add(descriptor.TypeName);
WritePrivateField(descriptor.TypeName,
CSharpTagHelperCodeRenderer.GetVariableName(descriptor),
value: null);
}
}
// We need to dive deeper to ensure we pick up any nested tag helpers.
Accept(chunk.Children);
}
public CSharpCodeVisitor(CSharpCodeWriter writer, CodeBuilderContext context)
: base(writer, context)
{
_paddingBuilder = new CSharpPaddingBuilder(context.Host);
TagHelperRenderer = new CSharpTagHelperCodeRenderer(this, writer, context);
}
