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use syn::{Meta, Token, punctuated::Punctuated};
use crate::{common::number::meta_2_number, panic};
#[derive(Debug, Clone)]
pub(crate) struct Length {
pub(crate) min: Option<usize>,
pub(crate) trimmed_min: Option<usize>,
pub(crate) max: Option<usize>,
}
impl Length {
#[inline]
pub(crate) fn from_meta(meta: &Meta) -> syn::Result<Self> {
let correct_parameters = ["min", "trimmed_min", "max"];
let mut min = None;
let mut trimmed_min = None;
let mut max = None;
match meta {
Meta::Path(_) | Meta::NameValue(_) => {
return Err(panic::attribute_incorrect_format(meta.path()));
},
Meta::List(list) => {
let result =
list.parse_args_with(Punctuated::<Meta, Token![,]>::parse_terminated)?;
let mut min_is_set = false;
let mut trimmed_min_is_set = false;
let mut max_is_set = false;
let mut handler = |meta: &Meta| -> syn::Result<bool> {
if let Some(ident) = meta.path().get_ident() {
match ident.to_string().as_str() {
"min" => {
let v = meta_2_number(meta)?;
if min_is_set {
return Err(panic::parameter_reset(ident));
}
min_is_set = true;
min = Some(v);
return Ok(true);
},
"trimmed_min" => {
let v = meta_2_number(meta)?;
if trimmed_min_is_set {
return Err(panic::parameter_reset(ident));
}
trimmed_min_is_set = true;
trimmed_min = Some(v);
return Ok(true);
},
"max" => {
let v = meta_2_number(meta)?;
if max_is_set {
return Err(panic::parameter_reset(ident));
}
max_is_set = true;
max = Some(v);
return Ok(true);
},
_ => (),
}
}
Ok(false)
};
for p in result {
if !handler(&p)? {
return Err(panic::parameter_incorrect_format(
p.path(),
&correct_parameters,
));
}
}
},
}
if let Some(min) = min {
if let Some(trimmed_min) = trimmed_min
&& trimmed_min > min
{
return Err(syn::Error::new_spanned(
meta.path(),
format!("{trimmed_min} > {min} (trimmed_min > min)"),
));
}
if let Some(max) = max
&& min > max
{
return Err(syn::Error::new_spanned(
meta.path(),
format!("{min} > {max} (min > max)"),
));
}
}
if let Some(trimmed_min) = trimmed_min
&& let Some(max) = max
&& trimmed_min > max
{
return Err(syn::Error::new_spanned(
meta.path(),
format!("{trimmed_min} > {max} (trimmed_min > max)"),
));
}
Ok(Self {
min,
trimmed_min,
max,
})
}
}