vld 0.3.0

Type-safe runtime validation library for Rust, inspired by Zod
Documentation 
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use serde_json::Value;

use crate::error::VldError;
use crate::schema::VldSchema;

/// Wraps a schema with a fallback value returned on ANY validation error.
///
/// Unlike [`ZDefault`](crate::modifiers::ZDefault) which only catches null/missing,
/// `ZCatch` catches all errors including invalid data.
///
/// Created via [`VldSchema::catch()`].
pub struct ZCatch<T: VldSchema>
where
    T::Output: Clone,
{
    inner: T,
    fallback: T::Output,
}

impl<T: VldSchema> ZCatch<T>
where
    T::Output: Clone,
{
    pub fn new(inner: T, fallback: T::Output) -> Self {
        Self { inner, fallback }
    }

    /// Access the inner schema.
    pub fn inner_schema(&self) -> &T {
        &self.inner
    }
}

impl<T: VldSchema> VldSchema for ZCatch<T>
where
    T::Output: Clone,
{
    type Output = T::Output;

    fn parse_value(&self, value: &Value) -> Result<T::Output, VldError> {
        match self.inner.parse_value(value) {
            Ok(v) => Ok(v),
            Err(_) => Ok(self.fallback.clone()),
        }
    }
}