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|
use syn::punctuated::Punctuated;
use syn::spanned::Spanned;
use syn::Token;
pub mod attrs;
mod ctx;
pub mod inputs;
mod symbol;
pub use ctx::Context;
pub struct Field<'a> {
pub member: syn::Member,
pub ty: &'a syn::Type,
pub attrs: attrs::Field,
pub original: &'a syn::Field,
}
impl<'a> Field<'a> {
pub fn from_ast(ctx: &Context, idx: usize, field: &'a syn::Field) -> Field<'a> {
let attrs = attrs::Field::from_ast(ctx, &field.attrs);
let member = match &field.ident {
Some(id) => syn::Member::Named(id.clone()),
None => syn::Member::Unnamed(idx.into()),
};
Field {
member,
attrs,
ty: &field.ty,
original: field,
}
}
pub fn var_ident(&self) -> syn::Ident {
match &self.member {
syn::Member::Named(name) => name.clone(),
syn::Member::Unnamed(idx) => {
syn::Ident::new(&format!("field{}", idx.index), self.original.span())
}
}
}
}
pub struct Variant<'a> {
pub ident: &'a syn::Ident,
pub attrs: attrs::Variant,
pub style: Style,
pub fields: Vec<Field<'a>>,
//pub original: &'a syn::Variant,
}
impl<'a> Variant<'a> {
pub fn from_ast(ctx: &Context, variant: &'a syn::Variant) -> Self {
let attrs = attrs::Variant::from_ast(ctx, &variant.attrs);
let (style, fields) = match &variant.fields {
syn::Fields::Named(fields) => (Style::Struct, fields_ast(ctx, &fields.named)),
syn::Fields::Unnamed(fields) => (Style::Tuple, fields_ast(ctx, &fields.unnamed)),
syn::Fields::Unit => (Style::Unit, Vec::new()),
};
Variant {
ident: &variant.ident,
attrs,
style,
fields,
//original: variant,
}
}
}
#[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Clone, Copy)]
pub enum Style {
Struct,
Tuple,
Unit,
}
pub enum Data<'a> {
Enum(Vec<Variant<'a>>),
Struct(Style, Vec<Field<'a>>),
}
pub struct Container<'a> {
pub ident: &'a syn::Ident,
pub attrs: attrs::Container,
pub data: Data<'a>,
pub crate_path: syn::Path,
pub original: &'a syn::DeriveInput,
}
impl<'a> Container<'a> {
pub fn from_ast(
ctx: &Context,
crate_path: syn::Path,
input: &'a mut syn::DeriveInput,
) -> Option<Container<'a>> {
let attrs = attrs::Container::from_ast(ctx, &input.attrs);
let data = match &input.data {
syn::Data::Struct(s) => match &s.fields {
syn::Fields::Named(fields) => {
Data::Struct(Style::Struct, fields_ast(ctx, &fields.named))
}
syn::Fields::Unnamed(fields) => {
Data::Struct(Style::Tuple, fields_ast(ctx, &fields.unnamed))
}
syn::Fields::Unit => Data::Struct(Style::Unit, Vec::new()),
},
syn::Data::Enum(e) => {
let variants = e
.variants
.iter()
.map(|variant| Variant::from_ast(ctx, variant))
.collect();
Data::Enum(variants)
}
syn::Data::Union(u) => {
ctx.error_spanned(u.union_token, "Union not supported by nix-compat");
return None;
}
};
Some(Container {
ident: &input.ident,
attrs,
data,
crate_path,
original: input,
})
}
pub fn crate_path(&self) -> &syn::Path {
if let Some(crate_path) = self.attrs.crate_path.as_ref() {
crate_path
} else {
&self.crate_path
}
}
pub fn ident_type(&self) -> syn::Type {
let path: syn::Path = self.ident.clone().into();
let tp = syn::TypePath { qself: None, path };
tp.into()
}
}
pub struct Remote<'a> {
pub attrs: attrs::Container,
pub ty: &'a syn::Type,
pub crate_path: syn::Path,
}
impl<'a> Remote<'a> {
pub fn from_ast(
ctx: &Context,
crate_path: syn::Path,
input: &'a inputs::RemoteInput,
) -> Option<Remote<'a>> {
let attrs = attrs::Container::from_ast(ctx, &input.attrs);
if attrs.from_str.is_none() && attrs.type_from.is_none() && attrs.type_try_from.is_none() {
ctx.error_spanned(input, "Missing from_str, from or try_from attribute");
return None;
}
Some(Remote {
ty: &input.ident,
attrs,
crate_path,
})
}
pub fn crate_path(&self) -> &syn::Path {
if let Some(crate_path) = self.attrs.crate_path.as_ref() {
crate_path
} else {
&self.crate_path
}
}
}
fn fields_ast<'a>(ctx: &Context, fields: &'a Punctuated<syn::Field, Token![,]>) -> Vec<Field<'a>> {
fields
.iter()
.enumerate()
.map(|(idx, field)| Field::from_ast(ctx, idx, field))
.collect()
}
|
