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Auto merge of #59655 - Zoxc:symbols, r=petrochenkov
Use a proc macro to declare preallocated symbols r? @petrochenkov
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Original file line number | Diff line number | Diff line change |
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use proc_macro::TokenStream; | ||
use syn::{ | ||
Token, Ident, LitStr, | ||
braced, parse_macro_input, | ||
}; | ||
use syn::parse::{Result, Parse, ParseStream}; | ||
use syn; | ||
use std::collections::HashSet; | ||
use quote::quote; | ||
|
||
#[allow(non_camel_case_types)] | ||
mod kw { | ||
syn::custom_keyword!(Keywords); | ||
syn::custom_keyword!(Other); | ||
} | ||
|
||
struct Keyword { | ||
name: Ident, | ||
value: LitStr, | ||
} | ||
|
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impl Parse for Keyword { | ||
fn parse(input: ParseStream<'_>) -> Result<Self> { | ||
let name = input.parse()?; | ||
input.parse::<Token![:]>()?; | ||
let value = input.parse()?; | ||
input.parse::<Token![,]>()?; | ||
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Ok(Keyword { | ||
name, | ||
value, | ||
}) | ||
} | ||
} | ||
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struct Symbol(Ident); | ||
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impl Parse for Symbol { | ||
fn parse(input: ParseStream<'_>) -> Result<Self> { | ||
let ident: Ident = input.parse()?; | ||
input.parse::<Token![,]>()?; | ||
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Ok(Symbol(ident)) | ||
} | ||
} | ||
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/// A type used to greedily parse another type until the input is empty. | ||
struct List<T>(Vec<T>); | ||
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impl<T: Parse> Parse for List<T> { | ||
fn parse(input: ParseStream<'_>) -> Result<Self> { | ||
let mut list = Vec::new(); | ||
while !input.is_empty() { | ||
list.push(input.parse()?); | ||
} | ||
Ok(List(list)) | ||
} | ||
} | ||
|
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struct Input { | ||
keywords: List<Keyword>, | ||
symbols: List<Symbol>, | ||
} | ||
|
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impl Parse for Input { | ||
fn parse(input: ParseStream<'_>) -> Result<Self> { | ||
input.parse::<kw::Keywords>()?; | ||
let content; | ||
braced!(content in input); | ||
let keywords = content.parse()?; | ||
|
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input.parse::<kw::Other>()?; | ||
let content; | ||
braced!(content in input); | ||
let symbols = content.parse()?; | ||
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Ok(Input { | ||
keywords, | ||
symbols, | ||
}) | ||
} | ||
} | ||
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pub fn symbols(input: TokenStream) -> TokenStream { | ||
let input = parse_macro_input!(input as Input); | ||
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let mut keyword_stream = quote! {}; | ||
let mut symbols_stream = quote! {}; | ||
let mut prefill_stream = quote! {}; | ||
let mut from_str_stream = quote! {}; | ||
let mut counter = 0u32; | ||
let mut keys = HashSet::<String>::new(); | ||
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let mut check_dup = |str: &str| { | ||
if !keys.insert(str.to_string()) { | ||
panic!("Symbol `{}` is duplicated", str); | ||
} | ||
}; | ||
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for keyword in &input.keywords.0 { | ||
let name = &keyword.name; | ||
let value = &keyword.value; | ||
check_dup(&value.value()); | ||
prefill_stream.extend(quote! { | ||
#value, | ||
}); | ||
keyword_stream.extend(quote! { | ||
pub const #name: Keyword = Keyword { | ||
ident: Ident::with_empty_ctxt(super::Symbol::new(#counter)) | ||
}; | ||
}); | ||
from_str_stream.extend(quote! { | ||
#value => Ok(#name), | ||
}); | ||
counter += 1; | ||
} | ||
|
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for symbol in &input.symbols.0 { | ||
let value = &symbol.0; | ||
let value_str = value.to_string(); | ||
check_dup(&value_str); | ||
prefill_stream.extend(quote! { | ||
#value_str, | ||
}); | ||
symbols_stream.extend(quote! { | ||
pub const #value: Symbol = Symbol::new(#counter); | ||
}); | ||
counter += 1; | ||
} | ||
|
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TokenStream::from(quote! { | ||
macro_rules! keywords { | ||
() => { | ||
#keyword_stream | ||
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impl std::str::FromStr for Keyword { | ||
type Err = (); | ||
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fn from_str(s: &str) -> Result<Self, ()> { | ||
match s { | ||
#from_str_stream | ||
_ => Err(()), | ||
} | ||
} | ||
} | ||
} | ||
} | ||
|
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macro_rules! symbols { | ||
() => { | ||
#symbols_stream | ||
} | ||
} | ||
|
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impl Interner { | ||
pub fn fresh() -> Self { | ||
Interner::prefill(&[ | ||
#prefill_stream | ||
]) | ||
} | ||
} | ||
}) | ||
} |
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