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builder.rs
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builder.rs
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use proc_macro::TokenStream;
use proc_macro2::TokenStream as TokenStream2;
use quote::{format_ident, quote, ToTokens, TokenStreamExt};
use syn::{
self,
parse::Parse,
parse_quote, token,
visit::{visit_type, visit_type_path, Visit},
Attribute, Fields, Generics, Ident, Token, Type, Visibility,
};
use std::{collections::HashSet};
use tools::{doc_struct, doc_type, format_code, modify};
#[path ="tools.rs"]
mod tools;
struct TypeModule {
attrs: Vec<Attribute>,
vis: Visibility,
ident: Ident,
inner: TypeModuleInner,
}
struct TypeModuleInner {
type_decls: Vec<TypeDecl>,
struct_decl: TypeStructure,
}
struct TypeStructure {
attrs: Vec<Attribute>,
vis: Visibility,
struct_token: Token![struct],
ident: Ident,
generics: Generics,
fields: Fields,
semi_colon: Option<Token![;]>,
}
struct TypeDecl {
docs: Attribute,
ident: Ident,
ty: Type,
}
struct Source {
name: String,
code: String,
}
struct FieldTypeGenerics(HashSet<Ident>);
impl FieldTypeGenerics {
fn get_idents(ty: &Type) -> Self {
let mut field_type_generics = FieldTypeGenerics(<_>::default());
visit_type(&mut field_type_generics, ty);
field_type_generics
}
}
impl<'ast> Visit<'ast> for FieldTypeGenerics {
fn visit_type_path(&mut self, i: &'ast syn::TypePath) {
if let Some(p) = i.path.segments.first() {
self.0.insert(p.ident.clone());
}
visit_type_path(self, i);
}
}
impl Parse for TypeModule {
fn parse(input: syn::parse::ParseStream) -> syn::Result<Self> {
let code = format_code(input.to_string());
println!("{}", code);
let mut attrs: Vec<Attribute> = input.call(Attribute::parse_outer)?;
let vis: Visibility = input.parse()?;
let struct_token: Token![struct] = input.parse()?;
let ident: Ident = input.parse()?;
let generics: Generics = input.parse()?;
let mut semi_colon: Option<Token![;]> = None;
let source = Source {
name: ident.to_string(),
code,
};
let mut type_decls: Vec<TypeDecl> = Vec::new();
let mut fields: Fields;
if input.peek(token::Brace) {
fields = Fields::Named(input.parse()?);
type_decls = parse_type_decls(&mut fields, &generics, &source);
} else if input.peek(token::Paren) {
fields = Fields::Unnamed(input.parse()?);
} else {
fields = Fields::Unit;
}
let docs = doc_struct(
source.name.as_str(),
source.code.as_str()
);
attrs.push(parse_quote!(#[doc = #docs]));
if input.peek(Token![;]) {
semi_colon = input.parse().ok();
}
let struct_decl = TypeStructure {
attrs: attrs.clone(),
vis: parse_quote!(pub),
struct_token,
ident: format_ident!("ty", span = proc_macro2::Span::call_site()),
generics,
fields: fields.clone(),
semi_colon,
};
let inner = TypeModuleInner {
type_decls,
struct_decl,
};
Ok(Self {
attrs,
vis,
ident,
inner,
})
}
}
impl ToTokens for TypeModule {
fn to_tokens(&self, tokens: &mut TokenStream2) {
let attrs = &self.attrs;
let vis = &self.vis;
let ident = &self.ident;
let module_inner = &self.inner;
let type_module = quote!(
#[allow(non_snake_case)]
#(#attrs)*
#vis mod #ident {
#![allow(non_camel_case_types)]
#module_inner
}
);
tokens.append_all(type_module);
}
}
impl ToTokens for TypeModuleInner {
fn to_tokens(&self, tokens: &mut TokenStream2) {
let type_delcs = &self.type_decls;
let struct_decl = &self.struct_decl;
let inner_decls = quote!(
#(#type_delcs)*
#struct_decl
);
tokens.append_all(inner_decls)
}
}
impl ToTokens for TypeStructure {
fn to_tokens(&self, tokens: &mut TokenStream2) {
let attrs = &self.attrs;
let visibility = &self.vis;
let struct_token = &self.struct_token;
let ident = &self.ident;
let generics = &self.generics;
let fields = &self.fields;
let semi_colon = &self.semi_colon;
let struct_decl = quote!(
#(#attrs)*
#visibility #struct_token #ident #generics #fields #semi_colon
);
tokens.append_all(struct_decl);
}
}
impl ToTokens for TypeDecl {
fn to_tokens(&self, tokens: &mut TokenStream2) {
let docs = &self.docs;
let ident = &self.ident;
let ty = &self.ty;
tokens.append_all(quote!(#docs pub type #ident = #ty;));
}
}
impl TypeDecl {
pub fn new<'a>(source_code: &'a str, ident: &'a Ident, ty: &'a Type) -> Self {
let docs = doc_type(ident, ty, source_code);
let docs: Attribute = parse_quote!(#[doc = #docs]);
Self {
docs,
ident: ident.clone(),
ty: ty.clone(),
}
}
}
fn parse_type_decls(fields: &mut Fields, generics: &Generics, source: &Source) -> Vec<TypeDecl> {
let mut type_decls: Vec<TypeDecl> = Vec::new();
let param_generics = generics
.type_params()
.map(|tp| tp.ident.clone())
.collect::<HashSet<Ident>>();
for (index, field) in fields.iter_mut().enumerate() {
let field_type_generics = FieldTypeGenerics::get_idents(&field.ty);
if param_generics.intersection(&field_type_generics.0).count() == 0 {
let field_ident = modify(field, source.name.as_str(), index);
type_decls.push(TypeDecl::new(source.code.as_str(), &field_ident, &field.ty));
}
}
type_decls
}
pub fn codegen(_attr: TokenStream, item: TokenStream) -> TokenStream {
let type_module = syn::parse::<TypeModule>(item).unwrap();
let output = quote!(#type_module);
output.into()
}