public void AddRequiredAttributes(TagMatchingRuleDescriptorBuilder ruleBuilder)
{
if (string.IsNullOrEmpty(_requiredAttributes))
{
return;
}
var descriptors = new List <RequiredAttributeDescriptor>();
PassOptionalWhitespace();
do
{
var successfulParse = true;
ruleBuilder.Attribute(attributeBuilder =>
{
if (At('['))
{
if (!TryParseCssSelector(attributeBuilder))
{
successfulParse = false;
return;
}
}
else
{
ParsePlainSelector(attributeBuilder);
}
PassOptionalWhitespace();
if (At(','))
{
_index++;
if (!EnsureNotAtEnd(attributeBuilder))
{
successfulParse = false;
return;
}
}
else if (!AtEnd)
{
var diagnostic = RazorDiagnosticFactory.CreateTagHelper_InvalidRequiredAttributeCharacter(Current, _requiredAttributes);
attributeBuilder.Diagnostics.Add(diagnostic);
successfulParse = false;
return;
}
PassOptionalWhitespace();
});
if (!successfulParse)
{
break;
}
}while (!AtEnd);
}
private bool TryParseCssSelector(RequiredAttributeDescriptorBuilder attributeBuilder)
{
Debug.Assert(At('['));
// Move past '['.
_index++;
PassOptionalWhitespace();
ParseCssAttributeName(attributeBuilder);
PassOptionalWhitespace();
if (!EnsureNotAtEnd(attributeBuilder))
{
return(false);
}
if (!TryParseCssValueComparison(attributeBuilder, out RequiredAttributeDescriptor.ValueComparisonMode valueComparison))
{
return(false);
}
PassOptionalWhitespace();
if (!EnsureNotAtEnd(attributeBuilder))
{
return(false);
}
if (valueComparison != RequiredAttributeDescriptor.ValueComparisonMode.None && !TryParseCssValue(attributeBuilder))
{
return(false);
}
PassOptionalWhitespace();
if (At(']'))
{
// Move past the ending bracket.
_index++;
return(true);
}
else if (AtEnd)
{
var diagnostic = RazorDiagnosticFactory.CreateTagHelper_CouldNotFindMatchingEndBrace(_requiredAttributes);
attributeBuilder.Diagnostics.Add(diagnostic);
}
else
{
var diagnostic = RazorDiagnosticFactory.CreateTagHelper_InvalidRequiredAttributeCharacter(Current, _requiredAttributes);
attributeBuilder.Diagnostics.Add(diagnostic);
}
return(false);
}
