Method wrap_validator_if_collection

validify_derive/src/fields.rs:220–254

Wrap the quoted output of a validation with a for loop if the field type is a collection.

(
        &self,
        param: proc_macro2::TokenStream,
        tokens: proc_macro2::TokenStream,
    )

    /// Wrap the quoted output of a validation with a for loop if
    /// the field type is a collection.
    pub fn wrap_validator_if_collection(
        &self,
        param: proc_macro2::TokenStream,
        tokens: proc_macro2::TokenStream,
    ) -> proc_macro2::TokenStream {
        let field_name = &self.name;

        // When we're using an option, we'll have the field unwrapped, so we should not access it
        // through `self`.
        let prefix = (!self.is_option()).then(|| quote! { self. });

        // When iterating over a list, the iterator has Item=T, while a map yields Item=(K, V), and
        // we're only interested in V.
        if self.is_list() {
            quote!(
                for (i, item) in #prefix #param.iter().enumerate() {
                    if let Err(mut errs) = item.validate() {
                        errs.errors_mut().iter_mut().for_each(|err| err.set_location_idx(i, #field_name));
                        errors.merge(errs);
                    }
                }
            )
        } else if self.is_map() {
            quote!(
                for (key, item) in #prefix #param.iter() {
                    if let Err(mut errs) = item.validate() {
                        errs.errors_mut().iter_mut().for_each(|err| err.set_location_idx(key, #field_name));
                        errors.merge(errs);
                    }
                }
            )
        } else {
            tokens
        }
    }

    pub fn wrap_modifier_if_option(
        &self,