validator_derive 0.20.0

Macros 1.1 implementation of #[derive(Validate)]
Documentation 
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use quote::quote;

use crate::types::Schema;
use crate::utils::quote_message;

pub fn schema_tokens(schema: Schema) -> proc_macro2::TokenStream {
    let fn_call = schema.function;
    let args = if let Some(args) = schema.use_context {
        if args {
            quote!(&self, args)
        } else {
            quote!(&self)
        }
    } else {
        quote!(&self)
    };

    let skip_on_errors = schema.skip_on_field_errors.unwrap_or(true);

    let message = quote_message(schema.message);

    let code = if let Some(c) = schema.code {
        quote!(
            err.code = ::std::borrow::Cow::from(#c);
        )
    } else {
        quote!()
    };

    let fn_call = quote! {
        match #fn_call(#args) {
            ::std::result::Result::Ok(()) => {}
            ::std::result::Result::Err(mut err) => {
                #code
                #message
                errors.add("__all__", err);
            }
        }
    };

    if skip_on_errors {
        quote! {
            if errors.is_empty() || ((errors.field_errors().len() == 1) && errors.field_errors().contains_key("__all__")) {
                #fn_call
            }
        }
    } else {
        quote! {
            #fn_call
        }
    }
}