mirror of https://github.com/zkat/miette.git
90 lines
3.0 KiB
Rust
90 lines
3.0 KiB
Rust
use proc_macro2::{Span, TokenStream};
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use quote::quote;
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use syn::{
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parenthesized,
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parse::{Parse, ParseStream},
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Token,
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};
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use crate::{
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diagnostic::{DiagnosticConcreteArgs, DiagnosticDef},
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forward::WhichFn,
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utils::gen_all_variants_with,
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};
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pub struct Severity(pub syn::Ident);
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impl Parse for Severity {
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fn parse(input: ParseStream) -> syn::Result<Self> {
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let ident = input.parse::<syn::Ident>()?;
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if ident == "severity" {
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let la = input.lookahead1();
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if la.peek(syn::token::Paren) {
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let content;
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parenthesized!(content in input);
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let la = content.lookahead1();
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if la.peek(syn::LitStr) {
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let str = content.parse::<syn::LitStr>()?;
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let sev = get_severity(&str.value(), str.span())?;
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Ok(Severity(syn::Ident::new(&sev, str.span())))
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} else {
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let ident = content.parse::<syn::Ident>()?;
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let sev = get_severity(&ident.to_string(), ident.span())?;
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Ok(Severity(syn::Ident::new(&sev, ident.span())))
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}
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} else {
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input.parse::<Token![=]>()?;
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let str = input.parse::<syn::LitStr>()?;
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let sev = get_severity(&str.value(), str.span())?;
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Ok(Severity(syn::Ident::new(&sev, str.span())))
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}
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} else {
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Err(syn::Error::new(
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ident.span(),
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"MIETTE BUG: not a severity option",
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))
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}
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}
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}
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fn get_severity(input: &str, span: Span) -> syn::Result<String> {
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match input.to_lowercase().as_ref() {
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"error" | "err" => Ok("Error".into()),
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"warning" | "warn" => Ok("Warning".into()),
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"advice" | "adv" | "info" => Ok("Advice".into()),
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_ => Err(syn::Error::new(
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span,
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"Invalid severity level. Only Error, Warning, and Advice are supported.",
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)),
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}
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}
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impl Severity {
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pub(crate) fn gen_enum(variants: &[DiagnosticDef]) -> Option<TokenStream> {
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gen_all_variants_with(
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variants,
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WhichFn::Severity,
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|ident, fields, DiagnosticConcreteArgs { severity, .. }| {
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let severity = &severity.as_ref()?.0;
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let fields = match fields {
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syn::Fields::Named(_) => quote! { { .. } },
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syn::Fields::Unnamed(_) => quote! { (..) },
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syn::Fields::Unit => quote! {},
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};
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Some(
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quote! { Self::#ident #fields => std::option::Option::Some(miette::Severity::#severity), },
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)
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},
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)
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}
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pub(crate) fn gen_struct(&self) -> Option<TokenStream> {
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let sev = &self.0;
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Some(quote! {
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fn severity(&self) -> std::option::Option<miette::Severity> {
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Some(miette::Severity::#sev)
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}
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})
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}
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}
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