Trait synthez_core::parse::attrs::Attrs [−][src]
pub trait Attrs: Default + Parse {
fn try_merge(self, another: Self) -> Result<Self>;
fn validate(&self, _: &str, _: Span) -> Result<()> { ... }
fn fallback(&mut self, _: &[Attribute]) -> Result<()> { ... }
fn parse_attrs<T>(name: &str, item: &T) -> Result<Self>
where
T: Attrs + Spanned,
{ ... }
}
Expand description
Parse
ing of syn::Attribute
s into a custom defined struct.
Required methods
Provided methods
Validates these parsed attributes to meet additional invariants, if required.
The provided string contains name of the parsed syn::Attribute
, and
the provided Span
refers to the item this syn::Attribute
is
applied to. Use them to make reported errors well descriptive.
Errors
If validation fails.
Falls back to another values from syn::Attribute
s, if required.
Errors
If retrieving fallback values fails.
Parses this structure from the syn::Attribute
s with the given name
and contained in the given item
.
If multiple syn::Attribute
s occur with the same name
then they all
are parsed separately and then Attrs::try_merge
d.
If none syn::Attribute
s occur with the given name
then Default
value is returned, modulo Attrs::validate
.
Errors
- If
Parse
ing of thisAttrs
fails. - If either
Attrs::try_merge()
,Attrs::validate()
orAttrs::fallback()
fails.