Enum ParamConstraint 

pub enum ParamConstraint {
    Number,
    Alpha,
    AlphaNumeric,
    Slug,
    Uuid,
    In(Vec<String>),
    Custom(Arc<dyn Fn(&str) -> bool + Sync + Send>),
}

A restriction on what a route parameter may contain — a closed set of named kinds rather than a regular expression.

Named kinds instead of regexes keeps the crate free of a regex dependency and, more usefully, makes the common constraints declarative and impossible to get subtly wrong. ParamConstraint::Custom covers the rest.

Variants

Number

ASCII digits only.

Alpha

ASCII letters only.

AlphaNumeric

ASCII letters and digits.

Slug

Letters, digits, - and _ — a URL slug.

Uuid

A canonical 8-4-4-4-12 hexadecimal UUID.

In(Vec<String>)

One of a fixed set of values.

Custom(Arc<dyn Fn(&str) -> bool + Sync + Send>)

Any predicate.

Implementations

impl ParamConstraint

pub fn allows(&self, value: &str) -> bool

Whether value satisfies this constraint.

Trait Implementations

impl Clone for ParamConstraint

fn clone(&self) -> ParamConstraint

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ParamConstraint

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

Formats the value using the given formatter.