private bool IsAttributeValueContext(SyntaxToken token, out string tagName, out string attributeName)
{
XmlAttributeSyntax attributeSyntax = null;
if (token.Parent.IsKind(SyntaxKind.IdentifierName) &&
token.Parent.IsParentKind(SyntaxKind.XmlNameAttribute, out XmlNameAttributeSyntax xmlName))
{
// Handle the special 'name' attributes: name="bar$$
attributeSyntax = xmlName;
}
else if (token.IsKind(SyntaxKind.XmlTextLiteralToken) &&
token.Parent.IsKind(SyntaxKind.XmlTextAttribute, out XmlTextAttributeSyntax xmlText))
{
// Handle the other general text attributes: foo="bar$$
attributeSyntax = xmlText;
}
else if (token.Parent.IsKind(SyntaxKind.XmlNameAttribute, out attributeSyntax) ||
token.Parent.IsKind(SyntaxKind.XmlTextAttribute, out attributeSyntax))
{
// When there's no attribute value yet, the parent attribute is returned:
// name="$$
// foo="$$
if (token != attributeSyntax.StartQuoteToken)
{
attributeSyntax = null;
}
}
if (attributeSyntax != null)
{
attributeName = attributeSyntax.Name.LocalName.ValueText;
var emptyElement = attributeSyntax.GetAncestor <XmlEmptyElementSyntax>();
if (emptyElement != null)
{
// Empty element tags: <tag attr=... />
tagName = emptyElement.Name.LocalName.Text;
return(true);
}
var startTagSyntax = token.GetAncestor <XmlElementStartTagSyntax>();
if (startTagSyntax != null)
{
// Non-empty element start tags: <tag attr=... >
tagName = startTagSyntax.Name.LocalName.Text;
return(true);
}
}
attributeName = null;
tagName = null;
return(false);
}
/// <summary>
/// This is used to determine whether or not the current caret location is in an attribute value context
/// </summary>
/// <param name="token">The token to check</param>
/// <param name="elementName">On return, this will contain the element name if it is an attribute value
/// context, null if not.</param>
/// <param name="attributeName">On return, this will contain the attribute name if it is an attribute
/// value context, null if not.</param>
/// <returns>True if it is within the attribute value context, false if not.</returns>
private static bool IsAttributeValueContext(SyntaxToken token, out string elementName, out string attributeName)
{
XmlAttributeSyntax attributeSyntax = null;
if (token.IsKind(SyntaxKind.XmlTextLiteralToken) && token.Parent.IsKind(SyntaxKind.XmlTextAttribute))
{
// General attribute: attr="value|
attributeSyntax = (XmlTextAttributeSyntax)token.Parent;
}
else
if (token.Parent.IsKind(SyntaxKind.XmlNameAttribute) || token.Parent.IsKind(SyntaxKind.XmlTextAttribute))
{
// Return the parent attribute if there is no value yet: attr="|
attributeSyntax = (XmlAttributeSyntax)token.Parent;
if (token != attributeSyntax.StartQuoteToken)
{
attributeSyntax = null;
}
}
if (attributeSyntax != null)
{
attributeName = attributeSyntax.Name.LocalName.ValueText;
var emptyElement = attributeSyntax.GetAncestor <XmlEmptyElementSyntax>();
if (emptyElement != null)
{
// Self-closing or incomplete element: <elem attr="|" /> or <elem attr="|"
elementName = emptyElement.Name.LocalName.Text;
return(true);
}
var startTag = token.Parent?.FirstAncestorOrSelf <XmlElementStartTagSyntax>();
if (startTag != null)
{
// Start tag: <elem attr="|">
elementName = startTag.Name.LocalName.Text;
return(true);
}
}
attributeName = elementName = null;
return(false);
}
