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mod byte_attribute;
use byte_attribute::ByteAttribute;
use quote::quote;
use syn::{Data, DeriveInput, Fields, Meta, Path};
use super::ValidatorHandler;
use crate::{
common::{range::range_equal, type_enum::TypeEnum},
panic,
};
pub(crate) struct ByteHandler;
#[allow(dead_code)]
#[derive(Debug)]
pub struct Struct(TypeEnum);
const ITEM: Struct = Struct(TypeEnum::Bit);
impl ValidatorHandler for ByteHandler {
fn meta_handler(ast: DeriveInput, meta: Meta) -> syn::Result<proc_macro2::TokenStream> {
let type_attribute = ByteAttribute::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 name = ast.ident;
let error_path: Path = syn::parse2(quote! { validators_prelude::ByteError }).unwrap();
#[cfg(feature = "test")]
{
let v_range = &type_attribute.range;
let v_ignore_case = &type_attribute.ignore_case;
token_stream.extend(quote! {
impl #name {
pub(crate) const V_RANGE: validators_prelude::RangeOption<u128> = #v_range;
pub(crate) const V_IGNORE_CASE: bool = #v_ignore_case;
}
});
}
let equal = range_equal(
type_attribute.range.min,
type_attribute.range.max,
type_attribute.range.inclusive,
);
let handle_range = if equal {
let min = type_attribute.range.min.unwrap();
quote! {
match ::core::cmp::PartialOrd::partial_cmp(&v, &#min) {
Some(::core::cmp::Ordering::Equal) => (),
Some(::core::cmp::Ordering::Less) => return Err(#error_path::TooSmall),
Some(::core::cmp::Ordering::Greater) => return Err(#error_path::TooLarge),
None => unreachable!(),
}
}
} else {
let mut token_stream = proc_macro2::TokenStream::new();
if let Some(min) = type_attribute.range.min {
token_stream.extend(quote! {
if v < #min {
return Err(#error_path::TooSmall);
}
});
}
if let Some(max) = type_attribute.range.max {
token_stream.extend(if type_attribute.range.inclusive {
quote! {
if v > #max {
return Err(#error_path::TooLarge);
}
}
} else {
quote! {
if v >= #max {
return Err(#error_path::TooLarge);
}
}
});
}
token_stream
};
let ignore_case = type_attribute.ignore_case;
token_stream.extend(quote! {
impl #name {
fn v_parse_str(s: &str) -> Result<validators_prelude::byte_unit::Byte, #error_path> {
let v = validators_prelude::byte_unit::Byte::parse_str(s, #ignore_case)?;
Self::v_parse_v(v)?;
Ok(v)
}
fn v_parse_v(v: validators_prelude::byte_unit::Byte) -> Result<(), #error_path> {
#handle_range
Ok(())
}
}
});
token_stream.extend(quote! {
impl ValidateString for #name {
type Error = #error_path;
#[inline]
fn parse_string<S: Into<validators_prelude::String>>(s: S) -> Result<Self, Self::Error> {
Ok(Self(Self::v_parse_str(s.into().as_str())?))
}
#[inline]
fn parse_str<S: AsRef<str>>(s: S) -> Result<Self, Self::Error> {
Ok(Self(Self::v_parse_str(s.as_ref())?))
}
#[inline]
fn validate_str<S: AsRef<str>>(s: S) -> Result<(), Self::Error> {
Self::v_parse_str(s.as_ref())?;
Ok(())
}
}
});
token_stream.extend(quote! {
impl ValidateUnsignedInteger for #name {
type Error = #error_path;
#[inline]
fn parse_u128(u: u128) -> Result<Self, Self::Error> {
let v = validators_prelude::byte_unit::Byte::from_u128(u).ok_or(#error_path::TooLarge)?;
Self::v_parse_v(v)?;
Ok(Self(v))
}
#[inline]
fn validate_u128(u: u128) -> Result<(), Self::Error> {
let v = validators_prelude::byte_unit::Byte::from_u128(u).ok_or(#error_path::TooLarge)?;
Self::v_parse_v(v)?;
Ok(())
}
#[inline]
fn parse_u64(u: u64) -> Result<Self, Self::Error> {
let v = validators_prelude::byte_unit::Byte::from_u64(u);
Self::v_parse_v(v)?;
Ok(Self(v))
}
#[inline]
fn validate_u64(u: u64) -> Result<(), Self::Error> {
let v = validators_prelude::byte_unit::Byte::from_u64(u);
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 {
let expect =
"a string such as \"123\", \"123Kib\", \"50.84 Mb\", or a positive integer";
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>, {
struct MyVisitor;
impl<'de> validators_prelude::serde::de::Visitor<'de> for MyVisitor {
type Value = #name;
#[inline]
fn expecting(&self, f: &mut ::core::fmt::Formatter<'_>) -> ::core::fmt::Result {
f.write_str(#expect)
}
#[inline]
fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
where
E: validators_prelude::serde::de::Error, {
<#name as ValidateString>::parse_str(v).map_err(validators_prelude::serde::de::Error::custom)
}
fn visit_u128<E>(self, v: u128) -> Result<Self::Value, E>
where
E: validators_prelude::serde::de::Error, {
<#name as ValidateUnsignedInteger>::parse_u128(v).map_err(validators_prelude::serde::de::Error::custom)
}
}
if deserializer.is_human_readable() {
deserializer.deserialize_str(MyVisitor)
} else {
deserializer.deserialize_u128(MyVisitor)
}
}
}
});
}
}
#[cfg(feature = "rocket")]
{
if type_attribute.rocket_options.from_form_field {
crate::common::rocket::impl_from_form_field(&mut token_stream, &name);
}
if type_attribute.rocket_options.from_param {
crate::common::rocket::impl_from_param(&mut token_stream, &name, &error_path);
}
}
return Ok(token_stream);
}
Err(panic::validator_for_specific_item(meta.path(), ITEM))
}
}