Struct FieldRule 

pub struct FieldRule<C> {
    pub at: PathPat,
    pub ty: Option<FieldType>,
    pub constraint: Option<C>,
    pub present: Presentation,
}

One field rule: which node(s) it governs, the type it expects, an optional constraint of the embedder’s own type C, and how to present it.

Fields

at: PathPat

Which node(s) this governs (reaches list elements, not only scalars).

ty: Option<FieldType>

The expected type — drives type-directed parsing and widget choice.

constraint: Option<C>

A value constraint, in whatever shape the embedder defines.

present: Presentation

Renderer-neutral presentation hints.

Implementations

impl<C: Validate> FieldRule<C>

pub fn validate(&self, value: &Value) -> Validation

Validate a candidate value against this rule’s constraint. A rule with no constraint (or a type-only rule) imposes nothing here.

Trait Implementations

impl<C: Clone> Clone for FieldRule<C>

fn clone(&self) -> FieldRule<C>

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<C: Debug> Debug for FieldRule<C>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.