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use std::collections::HashMap;
use proc_macro2::TokenStream as TokenStream2;
use quote::{format_ident, quote};
use syn::{
parse::{Parse, ParseStream, Result},
punctuated::Punctuated,
Expr, ExprArray, Ident, Lit, Path, Token,
};
struct KeyValue {
key: Ident,
_eq: Token![=],
value: Expr,
}
impl Parse for KeyValue {
fn parse(input: ParseStream) -> Result<Self> {
Ok(Self {
key: input.parse()?,
_eq: input.parse()?,
value: input.parse()?,
})
}
}
pub struct RawLintMeta(HashMap<Ident, Expr>);
impl Parse for RawLintMeta {
fn parse(input: ParseStream) -> Result<Self> {
Ok(Self(
Punctuated::<KeyValue, Token![,]>::parse_terminated(input)?
.into_iter()
.map(|item| (item.key, item.value))
.collect(),
))
}
}
pub struct LintMeta<'μ> {
name: &'μ Lit,
note: &'μ Lit,
code: &'μ Lit,
match_with: MatchWith<'μ>,
}
enum MatchWith<'π> {
Path(&'π Path),
Array(&'π ExprArray),
}
fn extract<'λ>(id: &str, raw: &'λ RawLintMeta) -> &'λ Expr {
raw.0
.get(&format_ident!("{}", id))
.unwrap_or_else(|| panic!("`{}` not present", id))
}
fn as_lit(e: &Expr) -> &Lit {
match e {
Expr::Lit(l) => &l.lit,
_ => panic!("expected a literal"),
}
}
impl<'μ> LintMeta<'μ> {
fn from_raw(raw: &'μ RawLintMeta) -> Self {
let name = as_lit(extract("name", raw));
let note = as_lit(extract("note", raw));
let code = as_lit(extract("code", raw));
let match_with_expr = extract("match_with", raw);
let match_with = match match_with_expr {
Expr::Path(p) => MatchWith::Path(&p.path),
Expr::Array(a) => MatchWith::Array(a),
_ => panic!("`match_with` is neither a path nor an array"),
};
Self {
name,
note,
code,
match_with,
}
}
fn generate_name_fn(&self) -> TokenStream2 {
let name_str = self.name;
return quote! {
fn name(&self) -> &'static str {
#name_str
}
};
}
fn generate_note_fn(&self) -> TokenStream2 {
let note_str = self.note;
return quote! {
fn note(&self) -> &'static str {
#note_str
}
};
}
fn generate_code_fn(&self) -> TokenStream2 {
let code_int = self.code;
return quote! {
fn code(&self) -> u32 {
#code_int
}
};
}
fn generate_match_with_fn(&self) -> TokenStream2 {
match self.match_with {
MatchWith::Path(p) => {
quote! {
fn match_with(&self, with: &SyntaxKind) -> bool {
#p == *with
}
}
}
MatchWith::Array(a) => {
quote! {
fn match_with(&self, with: &SyntaxKind) -> bool {
#a.contains(with)
}
}
}
}
}
fn generate_match_kind_fn(&self) -> TokenStream2 {
match self.match_with {
MatchWith::Path(p) => {
quote! {
fn match_kind(&self) -> Vec<SyntaxKind> {
vec![#p]
}
}
}
MatchWith::Array(a) => {
quote! {
fn match_kind(&self) -> Vec<SyntaxKind> {
#a.to_vec()
}
}
}
}
}
fn generate_report_fn(&self) -> TokenStream2 {
quote! {
fn report(&self) -> crate::Report {
crate::Report::new(self.note(), self.code())
}
}
}
}
pub fn generate_meta_impl(struct_name: &Ident, meta: &RawLintMeta) -> TokenStream2 {
let not_raw = LintMeta::from_raw(meta);
let name_fn = not_raw.generate_name_fn();
let note_fn = not_raw.generate_note_fn();
let code_fn = not_raw.generate_code_fn();
let match_with_fn = not_raw.generate_match_with_fn();
let match_kind = not_raw.generate_match_kind_fn();
let report_fn = not_raw.generate_report_fn();
quote! {
impl crate::Metadata for #struct_name {
#name_fn
#note_fn
#code_fn
#match_with_fn
#match_kind
#report_fn
}
}
}
|
