serde_valid_derive 2.0.2

JSON Schema based validation tool using serde.
Documentation 
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use crate::attribute::common::lit::get_numeric;
use crate::attribute::common::message_format::MessageFormat;
use crate::attribute::Validator;
use crate::serde::rename::RenameMap;
use crate::types::Field;
use proc_macro2::TokenStream;
use quote::quote;

/// Length validation.
///
/// See <https://json-schema.org/understanding-json-schema/reference/array.html#length>
macro_rules! extract_array_length_validator{
    (
        $ErrorType:ident,
        $extract_validator:ident,
        $inner_extract_validator:ident,
        $ValidateTrait:ident,
        $validate_method:ident
    ) => {
        pub fn $extract_validator(
            field: &impl Field,
            validation_value: &syn::Lit,
            message_format: MessageFormat,
            rename_map: &RenameMap,
        ) -> Result<Validator, crate::Errors> {
            $inner_extract_validator(field, validation_value, message_format, rename_map)
        }

        fn $inner_extract_validator(
            field: &impl Field,
            validation_value: &syn::Lit,
            message_format: MessageFormat,
            rename_map: &RenameMap,
        ) -> Result<TokenStream, crate::Errors> {
            let field_name = field.name();
            let field_ident = field.ident();
            let field_key = field.key();
            let rename = rename_map.get(field_name).unwrap_or(&field_key);
            let limit = get_numeric(validation_value)?;
            let errors = field.errors_variable();

            Ok(quote!(
                if let Err(error_params) = ::serde_valid::$ValidateTrait::$validate_method(
                    #field_ident,
                    #limit,
                ) {
                    #errors
                        .entry(#rename)
                        .or_default()
                        .push(::serde_valid::validation::Error::$ErrorType(
                            ::serde_valid::validation::error::Message::new(
                                error_params,
                                #message_format,
                            )
                        ));
                }
            ))
        }
    }
}

extract_array_length_validator!(
    MaxItems,
    extract_array_max_items_validator,
    inner_extract_array_max_items_validator,
    ValidateMaxItems,
    validate_max_items
);
extract_array_length_validator!(
    MinItems,
    extract_array_min_items_validator,
    inner_extract_array_min_items_validator,
    ValidateMinItems,
    validate_min_items
);