Enum StandardAttribute

pub(crate) enum StandardAttribute<'a> {
    String(String),
    List(&'a MetaList),
    Empty,
}

Helper type for parsing standard attributes. A standard attribute typically will accept the forms:

• #[attr = "foo"] and #[attr("foo")] for a simple string
• #[attr(....)] for a more complicated context
• #[attr] for a “defaulting” context

This allows attributes to parse simple string values without caring too much about the NameValue vs List representation and then attributes can choose to handle more complicated lists if they so desire.

Variants

String(String)

List(&'a MetaList)

Empty

Implementations

impl<'a> StandardAttribute<'a>

pub(crate) fn from_meta(meta: &'a Meta) -> Result<Self, ()>

Parse from a Meta. Returns an error when no string value is specified in the path/namevalue forms.