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use super::super::{super::utils::*, attributes::*};
use {deluxe::*, proc_macro2::*, quote::*, syn::spanned::*};
//
// StructGenerator
//
/// Generator for `#[derive(Resolve)]` on structs.
#[derive(Default)]
pub struct StructGenerator {
/// Name of the struct for which we are generating.
pub struct_name: TokenStream,
/// The generics of the struct for which we are generating.
pub struct_generics: syn::Generics,
/// Struct-level attribute.
pub struct_attribute: StructAttribute,
/// The fields that should be resolved.
pub resolve_fields: Vec<(Field, TokenStream)>,
/// Will try to resolve to just this optional field first as a "single" notation.
pub single_field: Option<Field>,
/// The optional field used to store keys that are unused by the fields.
pub other_keys_field: Option<Field>,
/// The optional field used to store annotations for all other fields.
pub annotations_field: Option<TokenStream>,
/// All keys used by all resolved fields.
pub declared_keys: Vec<TokenStream>,
}
impl StructGenerator {
/// Generate.
pub fn generate(input: &mut syn::DeriveInput) -> syn::Result<TokenStream> {
let generator = Self::new(input)?;
let mut stream = generator.generate_impl_resolve();
if generator.annotations_field.is_some() {
stream.extend(generator.generate_impl_annotated());
// stream.extend(generator.generate_impl_citable_fields());
}
Ok(stream)
}
/// Constructor.
pub fn new(input: &mut syn::DeriveInput) -> syn::Result<Self> {
let mut generator = Self::default();
generator.struct_name = input.ident.to_token_stream();
generator.struct_generics = input.generics.clone();
generator.struct_attribute = extract_attributes(input)?;
match &mut input.data {
syn::Data::Struct(data) => {
for field in data.fields.iter_mut() {
if attributes_have_ident(&field.attrs, "resolve") {
let field_attribute: FieldAttribute = extract_attributes(field)?;
let field_name = field
.ident
.as_ref()
.ok_or_else(|| syn::Error::new(field.span(), "`resolve` attribute: unnamed field"))?;
if field_attribute.ignore_null && field_attribute.null.is_some() {
return Err(syn::Error::new(
field.span(),
"`resolve` attribute: can't specify both `ignore_null` and `null`",
));
}
if field_attribute.single {
if generator.single_field.is_some() {
return Err(syn::Error::new(
field.span(),
"`resolve` attribute: only one field may specify `single`",
));
} else {
generator.single_field = Some(Field {
name: field_name.to_token_stream(),
attribute: field_attribute.clone(),
});
}
}
if field_attribute.other_keys {
if generator.other_keys_field.is_some() {
return Err(syn::Error::new(
field.span(),
"`resolve` attribute: only one field may specify `other_keys`",
));
} else {
generator.other_keys_field = Some(Field {
name: field_name.to_token_stream(),
attribute: field_attribute.clone(),
});
continue;
}
}
if field_attribute.is_annotations(field)? {
if generator.annotations_field.is_some() {
return Err(syn::Error::new(
field.span(),
"`resolve` attribute: only one field may specify `citations`",
));
} else {
generator.annotations_field = Some(field_name.to_token_stream());
continue;
}
}
let key = match &field_attribute.key {
Some(key) => key.to_token_stream(),
None => (&field_name.to_string()).to_token_stream(), // will add quotation marks
};
generator.resolve_fields.push((
Field { name: field_name.to_token_stream(), attribute: field_attribute },
key.clone(),
));
generator.declared_keys.push(key);
}
}
}
_ => return Err(syn::Error::new(input.ident.span(), "`Resolve`: not a struct")),
}
if generator.struct_attribute.ignore_other_keys && generator.other_keys_field.is_some() {
return Err(syn::Error::new(
input.span(),
"`resolve` attribute: can't specify both `ignore_other_keys` and `other_keys`",
));
}
Ok(generator)
}
}
//
// Field
//
/// Generator field.
pub struct Field {
/// Field name.
pub name: TokenStream,
/// Field attribute.
pub attribute: FieldAttribute,
}