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mod length_attribute;
use length_attribute::LengthAttribute;
use quote::quote;
use syn::{Data, DeriveInput, Fields, Meta, Path};
use super::ValidatorHandler;
use crate::{common::type_enum::TypeEnum, panic};
pub(crate) struct LengthHandler;
#[allow(dead_code)]
#[derive(Debug)]
pub struct Struct(TypeEnum);
const ITEM: Struct = Struct(TypeEnum::CollectionLength);
impl ValidatorHandler for LengthHandler {
fn meta_handler(ast: DeriveInput, meta: Meta) -> syn::Result<proc_macro2::TokenStream> {
let type_attribute = LengthAttribute::build_from_meta(&meta)?;
if let Data::Struct(data) = ast.data
&& let Fields::Unnamed(_) = &data.fields
&& data.fields.len() == 1
{
let mut token_stream = proc_macro2::TokenStream::new();
let data_type = data.fields.into_iter().next().unwrap().ty;
let name = ast.ident;
let error_path: Path = syn::parse2(quote! { validators_prelude::LengthError }).unwrap();
#[cfg(feature = "test")]
{
let min_expr = {
match type_attribute.min {
Some(min) => {
quote! {
Some(#min)
}
},
None => {
quote! {
None
}
},
}
};
let max_expr = {
match type_attribute.max {
Some(max) => {
quote! {
Some(#max)
}
},
None => {
quote! {
None
}
},
}
};
token_stream.extend(quote! {
impl #name {
pub(crate) const V_LENGTH_MIN: Option<usize> = #min_expr;
pub(crate) const V_LENGTH_MAX: Option<usize> = #max_expr;
}
});
}
let handle_range = {
match type_attribute.min {
Some(min) => {
if let Some(max) = type_attribute.max {
if min == max {
quote! {
match ::core::cmp::Ord::cmp(&length, &#min) {
::core::cmp::Ordering::Equal => (),
::core::cmp::Ordering::Less => return Err(#error_path::TooSmall),
::core::cmp::Ordering::Greater => return Err(#error_path::TooLarge),
}
}
} else {
quote! {
let length = CollectionLength::len(v);
if length < #min {
return Err(#error_path::TooSmall);
}
if length > #max {
return Err(#error_path::TooLarge);
}
}
}
} else {
quote! {
let length = CollectionLength::len(v);
if length < #min {
return Err(#error_path::TooSmall);
}
}
}
},
None => match type_attribute.max {
Some(max) => {
quote! {
let length = CollectionLength::len(v);
if length > #max {
return Err(#error_path::TooLarge);
}
}
},
None => {
quote! {}
},
},
}
};
token_stream.extend(quote! {
impl #name {
#[allow(clippy::ptr_arg)]
#[inline]
fn v_parse_v(v: &#data_type) -> Result<(), #error_path> {
#handle_range
Ok(())
}
}
});
token_stream.extend(quote! {
impl ValidateLength<#data_type> for #name {
type Error = #error_path;
#[inline]
fn parse_collection(v: #data_type) -> Result<Self, Self::Error> {
Self::v_parse_v(&v)?;
Ok(Self(v))
}
#[allow(clippy::ptr_arg)]
#[inline]
fn validate_collection(v: &#data_type) -> Result<(), Self::Error> {
Self::v_parse_v(v)?;
Ok(())
}
}
});
#[cfg(feature = "serde")]
{
if type_attribute.serde_options.serialize {
token_stream.extend(quote! {
impl validators_prelude::serde::Serialize for #name {
#[inline]
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: validators_prelude::serde::Serializer, {
validators_prelude::serde::Serialize::serialize(&self.0, serializer)
}
}
});
}
if type_attribute.serde_options.deserialize {
token_stream.extend(quote! {
impl<'de> validators_prelude::serde::Deserialize<'de> for #name {
#[inline]
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: validators_prelude::serde::Deserializer<'de>, {
let v: #data_type = validators_prelude::serde::Deserialize::deserialize(deserializer)?;
Self::v_parse_v(&v).map_err(validators_prelude::serde::de::Error::custom)?;
Ok(Self(v))
}
}
});
}
}
return Ok(token_stream);
}
Err(panic::validator_for_specific_item(meta.path(), ITEM))
}
}