Enum Rule 

pub enum Rule {
    Range {
        field: &'static str,
        min: Option<f64>,
        max: Option<f64>,
    },
    OneOf {
        field: &'static str,
        values: &'static [&'static str],
    },
    Regex {
        field: &'static str,
        pattern: &'static str,
        summary: &'static str,
    },
    Length {
        field: &'static str,
        min: Option<usize>,
        max: Option<usize>,
    },
    ExactlyOne {
        fields: &'static [&'static str],
    },
    AtLeastOne {
        fields: &'static [&'static str],
    },
    All(&'static [Rule]),
    Any(&'static [Rule]),
    Not(&'static Rule),
    Custom {
        name: &'static str,
        summary: &'static str,
        eval: fn(&JsonObject) -> Result<(), FieldViolation>,
    },
}

Declarative validation rule. Built once per skill (typically as a &'static [Rule]) so there’s no per-call allocation cost.

Variants

Range

Numeric field must satisfy min <= value <= max. Either bound is optional. Works for any field that parses as f64.

Fields

field: &'static str

min: Option<f64>

max: Option<f64>

OneOf

String field must equal one of the listed values (case-sensitive).

Fields

field: &'static str

values: &'static [&'static str]

Regex

String field must match the given Rust regex. summary is a short human description (“ISO-3166 alpha-2”) shown in the error.

Fields

field: &'static str

pattern: &'static str

summary: &'static str

Length

String / array field length bounds (Unicode chars for strings, len for arrays).

Fields

field: &'static str

min: Option<usize>

max: Option<usize>

ExactlyOne

Exactly one of the named fields must be present + non-null.

Fields

fields: &'static [&'static str]

AtLeastOne

At least one of the named fields must be present + non-null.

Fields

fields: &'static [&'static str]

All(&'static [Rule])

Conjunction — every sub-rule must pass.

Any(&'static [Rule])

Disjunction — at least one sub-rule must pass. Failures are reported only when EVERY branch fails (aggregated).

Not(&'static Rule)

Negation — the inner rule must NOT match. Useful as the dual of OneOf.

Custom

Custom validator. Receives the full args object, returns Ok or one FieldViolation. Use sparingly — declarative variants are preferred because crate::describe can render them.

Fields

name: &'static str

Stable identifier shown in error output and introspection.

summary: &'static str

One-line summary shown in introspection.

eval: fn(&JsonObject) -> Result<(), FieldViolation>

Trait Implementations

impl Clone for Rule

fn clone(&self) -> Rule

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Rule

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

Formats the value using the given formatter.