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feat(macros): 🎸 the
part_writer! macro
Creating a writer from a mutable reference of a writer will automatically switch to the built-in widget if its reference is a built-in field or method.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,117 @@ | ||
| use proc_macro2::{Ident, TokenStream}; | ||
| use quote::{ToTokens, quote, quote_spanned}; | ||
| use syn::{ | ||
| AngleBracketedGenericArguments, Expr, Member, Result, Token, parenthesized, | ||
| parse::{Parse, ParseStream}, | ||
| punctuated::Punctuated, | ||
| token::Paren, | ||
| }; | ||
|
|
||
| use crate::{ | ||
| symbol_process::{DollarRef, DollarRefsCtx, DollarUsedInfo}, | ||
| variable_names::{BUILTIN_INFOS, BuiltinMemberType}, | ||
| }; | ||
|
|
||
| pub fn gen_code(input: TokenStream, refs_ctx: &mut DollarRefsCtx) -> TokenStream { | ||
| match syn::parse2::<PartWriter>(input) { | ||
| Ok(part) => { | ||
| let info = part.writer_info(refs_ctx); | ||
| let tokens = part.gen_tokens(&info, refs_ctx); | ||
| refs_ctx.add_dollar_ref(info); | ||
| tokens | ||
| } | ||
| Err(err) => err.to_compile_error(), | ||
| } | ||
| } | ||
|
|
||
| struct PartWriter { | ||
| and_token: Option<Token![&]>, | ||
| mutability: Option<Token![mut]>, | ||
| writer: Ident, | ||
| dot: Token![.], | ||
| part_expr: PartExpr, | ||
| } | ||
|
|
||
| enum PartExpr { | ||
| Member(Member), | ||
| Method { | ||
| method: Ident, | ||
| turbofish: Option<AngleBracketedGenericArguments>, | ||
| paren_token: Paren, | ||
| args: Punctuated<Expr, Token![,]>, | ||
| }, | ||
| } | ||
|
|
||
| impl Parse for PartWriter { | ||
| fn parse(input: ParseStream) -> Result<Self> { | ||
| let and_token = input.parse()?; | ||
| let mutability = input.parse()?; | ||
| let writer = input.parse()?; | ||
| let dot = input.parse()?; | ||
|
|
||
| let part_expr = if input.peek(syn::LitInt) { | ||
| PartExpr::Member(input.parse()?) | ||
| } else { | ||
| let name = input.parse::<Ident>()?; | ||
| if input.is_empty() { | ||
| PartExpr::Member(Member::Named(name)) | ||
| } else { | ||
| let turbofish = if input.peek(Token![::]) { | ||
| Some(AngleBracketedGenericArguments::parse_turbofish(input)?) | ||
| } else { | ||
| None | ||
| }; | ||
| let content; | ||
| PartExpr::Method { | ||
| method: name, | ||
| turbofish, | ||
| paren_token: parenthesized!(content in input), | ||
| args: content.parse_terminated(Expr::parse, Token![,])?, | ||
| } | ||
| } | ||
| }; | ||
| Ok(Self { and_token, mutability, writer, dot, part_expr }) | ||
| } | ||
| } | ||
|
|
||
| impl PartWriter { | ||
| fn writer_info(&self, refs_ctx: &DollarRefsCtx) -> DollarRef { | ||
| let builtin_info = match &self.part_expr { | ||
| PartExpr::Member(Member::Named(member)) => BUILTIN_INFOS | ||
| .get(&member.to_string()) | ||
| .filter(|info| info.mem_ty == BuiltinMemberType::Field), | ||
| PartExpr::Method { method, .. } => BUILTIN_INFOS | ||
| .get(&method.to_string()) | ||
| .filter(|info| info.mem_ty == BuiltinMemberType::Method), | ||
| _ => None, | ||
| }; | ||
| if let Some(info) = builtin_info { | ||
| refs_ctx.builtin_dollar_ref(self.writer.clone(), info, DollarUsedInfo::Writer) | ||
| } else { | ||
| DollarRef { name: self.writer.clone(), builtin: None, used: DollarUsedInfo::Writer } | ||
| } | ||
| } | ||
|
|
||
| fn gen_tokens(&self, writer_info: &DollarRef, refs_ctx: &DollarRefsCtx) -> TokenStream { | ||
| let Self { and_token, mutability, writer, dot, part_expr } = self; | ||
| let part_expr = match part_expr { | ||
| PartExpr::Member(member) => member.to_token_stream(), | ||
| PartExpr::Method { method, turbofish, paren_token, args } => { | ||
| let mut tokens = quote! {}; | ||
| method.to_tokens(&mut tokens); | ||
| turbofish.to_tokens(&mut tokens); | ||
| paren_token.surround(&mut tokens, |tokens| args.to_tokens(tokens)); | ||
| tokens | ||
| } | ||
| }; | ||
| let host = if writer_info.builtin.is_some() { | ||
| refs_ctx.builtin_host_tokens(writer_info) | ||
| } else { | ||
| writer.to_token_stream() | ||
| }; | ||
|
|
||
| quote_spanned! { writer.span() => | ||
| #host #dot map_writer(|w| PartData::from_ref_mut(#and_token #mutability w #dot #part_expr)) | ||
| } | ||
| } | ||
| } |
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