public override void VisitTagHelperHtmlAttribute(TagHelperHtmlAttributeIntermediateNode node)
{
var attribute = new HtmlAttributeIntermediateNode()
{
AttributeName = node.AttributeName,
Source = node.Source,
};
_children.Add(attribute);
for (var i = 0; i < node.Diagnostics.Count; i++)
{
attribute.Diagnostics.Add(node.Diagnostics[i]);
}
switch (node.AttributeStructure)
{
case AttributeStructure.Minimized:
attribute.Prefix = node.AttributeName;
attribute.Suffix = string.Empty;
break;
case AttributeStructure.NoQuotes:
case AttributeStructure.SingleQuotes:
case AttributeStructure.DoubleQuotes:
// We're ignoring attribute structure here for simplicity, it doesn't effect us.
attribute.Prefix = node.AttributeName + "=\"";
attribute.Suffix = "\"";
for (var i = 0; i < node.Children.Count; i++)
{
attribute.Children.Add(RewriteAttributeContent(node.Children[i]));
}
break;
}
IntermediateNode RewriteAttributeContent(IntermediateNode content)
{
if (content is HtmlContentIntermediateNode html)
{
var value = new HtmlAttributeValueIntermediateNode()
{
Source = content.Source,
};
for (var i = 0; i < html.Children.Count; i++)
{
value.Children.Add(html.Children[i]);
}
for (var i = 0; i < html.Diagnostics.Count; i++)
{
value.Diagnostics.Add(html.Diagnostics[i]);
}
return(value);
}
return(content);
}
}
public override void VisitTagHelperHtmlAttribute(TagHelperHtmlAttributeIntermediateNode node)
{
// Don't rewrite inside of attributes
}
public virtual void VisitTagHelperHtmlAttribute(TagHelperHtmlAttributeIntermediateNode node)
{
VisitDefault(node);
}
public override void VisitTagHelperHtmlAttribute(TagHelperHtmlAttributeIntermediateNode node)
{
WriteContentNode(node, node.AttributeName, string.Format("HtmlAttributeValueStyle.{0}", node.AttributeStructure));
}
private static void RewriteCSharpAttributeContent(List <IntermediateNode> nodes, TagHelperHtmlAttributeIntermediateNode node)
{
var attributeNode = new HtmlAttributeIntermediateNode()
{
AttributeName = node.AttributeName,
Prefix = "=\"",
Suffix = "\"",
};
nodes.Add(attributeNode);
var valueNode = new CSharpExpressionAttributeValueIntermediateNode();
attributeNode.Children.Add(valueNode);
for (var i = 0; i < node.Children[0].Children.Count; i++)
{
valueNode.Children.Add(node.Children[0].Children[i]);
}
}
private static void RewriteHtmlAttributeContent(List <IntermediateNode> nodes, TagHelperHtmlAttributeIntermediateNode node)
{
switch (node.AttributeStructure)
{
case AttributeStructure.Minimized:
nodes.Add(new HtmlContentIntermediateNode()
{
Children =
{
new IntermediateToken()
{
Content = node.AttributeName + " ",
Kind = TokenKind.Html,
}
}
});
break;
// Blazor doesn't really care about preserving the fidelity of the attributes.
case AttributeStructure.NoQuotes:
case AttributeStructure.SingleQuotes:
case AttributeStructure.DoubleQuotes:
var htmlNode = new HtmlContentIntermediateNode();
nodes.Add(htmlNode);
htmlNode.Children.Add(new IntermediateToken()
{
Content = node.AttributeName + "=\"",
Kind = TokenKind.Html,
});
for (var i = 0; i < node.Children[0].Children.Count; i++)
{
htmlNode.Children.Add(node.Children[0].Children[i]);
}
htmlNode.Children.Add(new IntermediateToken()
{
Content = "\" ",
Kind = TokenKind.Html,
});
break;
}
}
private static void RewriteEmptyAttributeContent(List <IntermediateNode> nodes, TagHelperHtmlAttributeIntermediateNode node)
{
nodes.Add(new HtmlContentIntermediateNode()
{
Children =
{
new IntermediateToken()
{
Content = node.AttributeName + " ",
Kind = TokenKind.Html,
}
}
});
}
private void AddTagHelperAttributes(IList <TagHelperAttributeNode> attributes, TagHelperBinding tagHelperBinding)
{
var descriptors = tagHelperBinding.Descriptors;
var renderedBoundAttributeNames = new HashSet <string>(StringComparer.OrdinalIgnoreCase);
foreach (var attribute in attributes)
{
var attributeValueNode = attribute.Value;
var associatedDescriptors = descriptors.Where(descriptor =>
descriptor.BoundAttributes.Any(attributeDescriptor => TagHelperMatchingConventions.CanSatisfyBoundAttribute(attribute.Name, attributeDescriptor)));
if (associatedDescriptors.Any() && renderedBoundAttributeNames.Add(attribute.Name))
{
var isMinimizedAttribute = attributeValueNode == null;
if (isMinimizedAttribute && !_featureFlags.AllowMinimizedBooleanTagHelperAttributes)
{
// Minimized attributes are not valid for non-boolean bound attributes. TagHelperBlockRewriter
// has already logged an error if it was a non-boolean bound attribute; so we can skip.
continue;
}
foreach (var associatedDescriptor in associatedDescriptors)
{
var associatedAttributeDescriptor = associatedDescriptor.BoundAttributes.First(a =>
{
return(TagHelperMatchingConventions.CanSatisfyBoundAttribute(attribute.Name, a));
});
var expectsBooleanValue = associatedAttributeDescriptor.ExpectsBooleanValue(attribute.Name);
if (isMinimizedAttribute && !expectsBooleanValue)
{
// We do not allow minimized non-boolean bound attributes.
continue;
}
var setTagHelperProperty = new TagHelperPropertyIntermediateNode()
{
AttributeName = attribute.Name,
BoundAttribute = associatedAttributeDescriptor,
TagHelper = associatedDescriptor,
AttributeStructure = attribute.AttributeStructure,
Source = BuildSourceSpanFromNode(attributeValueNode),
IsIndexerNameMatch = TagHelperMatchingConventions.SatisfiesBoundAttributeIndexer(attribute.Name, associatedAttributeDescriptor),
};
_builder.Push(setTagHelperProperty);
attributeValueNode?.Accept(this);
_builder.Pop();
}
}
else
{
var addHtmlAttribute = new TagHelperHtmlAttributeIntermediateNode()
{
AttributeName = attribute.Name,
AttributeStructure = attribute.AttributeStructure
};
_builder.Push(addHtmlAttribute);
if (attributeValueNode != null)
{
attributeValueNode.Accept(this);
}
_builder.Pop();
}
}
}