use darling::util::SpannedValue;
use darling::FromMeta;
use proc_macro2::TokenStream;
use quote::{quote, ToTokens};
use syn::{Error, Expr, Lit, Result};
#[derive(Clone)]
pub enum Number {
F64(f64),
I64(i64),
}
impl FromMeta for Number {
fn from_value(value: &Lit) -> darling::Result<Self> {
match value {
Lit::Int(n) => Ok(Number::I64(n.base10_parse::<i64>()?)),
Lit::Float(n) => Ok(Number::F64(n.base10_parse::<f64>()?)),
_ => Err(darling::Error::unexpected_type("number")),
}
}
}
impl ToTokens for Number {
fn to_tokens(&self, tokens: &mut TokenStream) {
match self {
Number::F64(n) => tokens.extend(quote!(#n as f64)),
Number::I64(n) => tokens.extend(quote!(#n as i64)),
}
}
}
#[derive(FromMeta, Default, Clone)]
pub struct Validators {
#[darling(default)]
multiple_of: Option<Number>,
#[darling(default)]
min_password_strength: Option<u8>,
#[darling(default)]
maximum: Option<Number>,
#[darling(default)]
minimum: Option<Number>,
#[darling(default)]
max_length: Option<usize>,
#[darling(default)]
min_length: Option<usize>,
#[darling(default)]
max_items: Option<usize>,
#[darling(default)]
min_items: Option<usize>,
#[darling(default)]
chars_max_length: Option<usize>,
#[darling(default)]
chars_min_length: Option<usize>,
#[darling(default)]
email: bool,
#[darling(default)]
url: bool,
#[darling(default)]
ip: bool,
#[darling(default)]
regex: Option<String>,
#[darling(default, multiple)]
custom: Vec<SpannedValue<String>>,
#[darling(default)]
list: bool,
}
impl Validators {
pub fn create_validators(
&self,
crate_name: &TokenStream,
value: TokenStream,
ty: TokenStream,
map_err: Option<TokenStream>,
) -> Result<TokenStream> {
let mut list_validators = Vec::new();
let mut elem_validators = Vec::new();
let mut codes = Vec::new();
if let Some(n) = &self.max_items {
list_validators.push(quote! {
#crate_name::validators::max_items(__raw_value, #n)
});
}
if let Some(n) = &self.min_items {
list_validators.push(quote! {
#crate_name::validators::min_items(__raw_value, #n)
});
}
if let Some(n) = &self.multiple_of {
elem_validators.push(quote! {
#crate_name::validators::multiple_of(__raw_value, #n)
});
}
if let Some(n) = &self.min_password_strength {
elem_validators.push(quote! {
#crate_name::validators::min_password_strength(__raw_value, #n)
});
}
if let Some(n) = &self.maximum {
elem_validators.push(quote! {
#crate_name::validators::maximum(__raw_value, #n)
});
}
if let Some(n) = &self.minimum {
elem_validators.push(quote! {
#crate_name::validators::minimum(__raw_value, #n)
});
}
if let Some(n) = &self.max_length {
elem_validators.push(quote! {
#crate_name::validators::max_length(__raw_value, #n)
});
}
if let Some(n) = &self.min_length {
elem_validators.push(quote! {
#crate_name::validators::min_length(__raw_value, #n)
});
}
if let Some(n) = &self.chars_max_length {
elem_validators.push(quote! {
#crate_name::validators::chars_max_length(__raw_value, #n)
});
}
if let Some(n) = &self.chars_min_length {
elem_validators.push(quote! {
#crate_name::validators::chars_min_length(__raw_value, #n)
});
}
if self.email {
elem_validators.push(quote! {
#crate_name::validators::email(__raw_value)
});
}
if self.url {
elem_validators.push(quote! {
#crate_name::validators::url(__raw_value)
});
}
if self.ip {
elem_validators.push(quote! {
#crate_name::validators::ip(__raw_value)
});
}
if let Some(re) = &self.regex {
elem_validators.push(quote! {
#crate_name::validators::regex(__raw_value, #re)
});
}
if !list_validators.is_empty() {
codes.push(quote! {
if let ::std::option::Option::Some(__raw_value) = #crate_name::InputType::as_raw_value(#value) {
#(#list_validators #map_err ?;)*
}
});
}
if !elem_validators.is_empty() {
if self.list {
codes.push(quote! {
if let ::std::option::Option::Some(value) = #crate_name::InputType::as_raw_value(#value) {
for __item in value {
if let ::std::option::Option::Some(__raw_value) = #crate_name::InputType::as_raw_value(__item) {
#(#elem_validators #map_err ?;)*
}
}
}
});
} else {
codes.push(quote! {
if let ::std::option::Option::Some(__raw_value) = #crate_name::InputType::as_raw_value(#value) {
#(#elem_validators #map_err ?;)*
}
});
}
}
for s in &self.custom {
let __create_custom_validator: Expr =
syn::parse_str(s).map_err(|err| Error::new(s.span(), err.to_string()))?;
if self.list {
codes.push(quote! {
let __custom_validator = #__create_custom_validator;
if let ::std::option::Option::Some(value) = #crate_name::InputType::as_raw_value(#value) {
for __item in value {
if let ::std::option::Option::Some(__raw_value) = #crate_name::InputType::as_raw_value(__item) {
#crate_name::CustomValidator::check(&__custom_validator, __raw_value)
.map_err(|err_msg| #crate_name::InputValueError::<#ty>::custom(err_msg)) #map_err ?;
}
}
}
});
} else {
codes.push(quote! {
let __custom_validator = #__create_custom_validator;
if let ::std::option::Option::Some(__raw_value) = #crate_name::InputType::as_raw_value(#value) {
#crate_name::CustomValidator::check(&__custom_validator, __raw_value)
.map_err(|err_msg| #crate_name::InputValueError::<#ty>::custom(err_msg)) #map_err ?;
}
});
}
}
if codes.is_empty() {
return Ok(quote!());
}
Ok(quote!(#(#codes)*))
}
}