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feat(labels): replace snippet stuff with simpler labels (#62)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,179 @@ | ||
| use proc_macro2::TokenStream; | ||
| use quote::{format_ident, quote}; | ||
| use syn::{ | ||
| parenthesized, | ||
| parse::{Parse, ParseStream}, | ||
| spanned::Spanned, | ||
| Token, | ||
| }; | ||
|
|
||
| use crate::{ | ||
| diagnostic::{DiagnosticConcreteArgs, DiagnosticDef}, | ||
| fmt::{self, Display}, | ||
| forward::WhichFn, | ||
| utils::{display_pat_members, gen_all_variants_with}, | ||
| }; | ||
|
|
||
| pub struct Labels(Vec<Label>); | ||
|
|
||
| struct Label { | ||
| label: Option<Display>, | ||
| span: syn::Member, | ||
| } | ||
|
|
||
| struct LabelAttr { | ||
| label: Option<Display>, | ||
| } | ||
|
|
||
| impl Parse for LabelAttr { | ||
| fn parse(input: ParseStream) -> syn::Result<Self> { | ||
| let la = input.lookahead1(); | ||
| let label = if la.peek(syn::token::Paren) { | ||
| // #[label("{}", x)] | ||
| let content; | ||
| parenthesized!(content in input); | ||
| if content.peek(syn::LitStr) { | ||
| let fmt = content.parse()?; | ||
| let args = if content.is_empty() { | ||
| TokenStream::new() | ||
| } else { | ||
| fmt::parse_token_expr(&content, false)? | ||
| }; | ||
| let display = Display { | ||
| fmt, | ||
| args, | ||
| has_bonus_display: false, | ||
| }; | ||
| Some(display) | ||
| } else { | ||
| return Err(syn::Error::new(input.span(), "Invalid argument to label() attribute. The first argument must be a literal string.")); | ||
| } | ||
| } else if la.peek(Token![=]) { | ||
| // #[label = "blabla"] | ||
| input.parse::<Token![=]>()?; | ||
| Some(Display { | ||
| fmt: input.parse()?, | ||
| args: TokenStream::new(), | ||
| has_bonus_display: false, | ||
| }) | ||
| } else { | ||
| None | ||
| }; | ||
| Ok(LabelAttr { label }) | ||
| } | ||
| } | ||
|
|
||
| impl Labels { | ||
| pub fn from_fields(fields: &syn::Fields) -> syn::Result<Option<Self>> { | ||
| match fields { | ||
| syn::Fields::Named(named) => Self::from_fields_vec(named.named.iter().collect()), | ||
| syn::Fields::Unnamed(unnamed) => { | ||
| Self::from_fields_vec(unnamed.unnamed.iter().collect()) | ||
| } | ||
| syn::Fields::Unit => Ok(None), | ||
| } | ||
| } | ||
|
|
||
| fn from_fields_vec(fields: Vec<&syn::Field>) -> syn::Result<Option<Self>> { | ||
| let mut labels = Vec::new(); | ||
| for (i, field) in fields.iter().enumerate() { | ||
| for attr in &field.attrs { | ||
| if attr.path.is_ident("label") { | ||
| let span = if let Some(ident) = field.ident.clone() { | ||
| syn::Member::Named(ident) | ||
| } else { | ||
| syn::Member::Unnamed(syn::Index { | ||
| index: i as u32, | ||
| span: field.span(), | ||
| }) | ||
| }; | ||
| let LabelAttr { label } = syn::parse2::<LabelAttr>(attr.tokens.clone())?; | ||
| labels.push(Label { label, span }); | ||
| } | ||
| } | ||
| } | ||
| if labels.is_empty() { | ||
| Ok(None) | ||
| } else { | ||
| Ok(Some(Labels(labels))) | ||
| } | ||
| } | ||
|
|
||
| pub(crate) fn gen_struct(&self, fields: &syn::Fields) -> Option<TokenStream> { | ||
| let (display_pat, display_members) = display_pat_members(fields); | ||
| let labels = self.0.iter().map(|highlight| { | ||
| let Label { span, label } = highlight; | ||
| if let Some(display) = label { | ||
| let (fmt, args) = display.expand_shorthand_cloned(&display_members); | ||
| quote! { | ||
| miette::LabeledSpan::new_with_span( | ||
| std::option::Option::Some(format!(#fmt #args)), | ||
| self.#span.clone(), | ||
| ) | ||
| } | ||
| } else { | ||
| quote! { | ||
| miette::LabeledSpan::new_with_span( | ||
| std::option::Option::None, | ||
| self.#span.clone(), | ||
| ) | ||
| } | ||
| } | ||
| }); | ||
| Some(quote! { | ||
| #[allow(unused_variables)] | ||
| fn labels(&self) -> std::option::Option<std::boxed::Box<dyn std::iter::Iterator<Item = miette::LabeledSpan> + '_>> { | ||
| let Self #display_pat = self; | ||
| Some(Box::new(vec![ | ||
| #(#labels),* | ||
| ].into_iter())) | ||
| } | ||
| }) | ||
| } | ||
|
|
||
| pub(crate) fn gen_enum(variants: &[DiagnosticDef]) -> Option<TokenStream> { | ||
| gen_all_variants_with( | ||
| variants, | ||
| WhichFn::Labels, | ||
| |ident, fields, DiagnosticConcreteArgs { labels, .. }| { | ||
| let (display_pat, display_members) = display_pat_members(fields); | ||
| labels.as_ref().and_then(|labels| { | ||
| let variant_labels = labels.0.iter().map(|label| { | ||
| let Label { span, label } = label; | ||
| let field = match &span { | ||
| syn::Member::Named(ident) => ident.clone(), | ||
| syn::Member::Unnamed(syn::Index { index, .. }) => { | ||
| format_ident!("_{}", index) | ||
| } | ||
| }; | ||
| if let Some(display) = label { | ||
| let (fmt, args) = display.expand_shorthand_cloned(&display_members); | ||
| quote! { | ||
| miette::LabeledSpan::new_with_span( | ||
| std::option::Option::Some(format!(#fmt #args)), | ||
| #field.clone(), | ||
| ) | ||
| } | ||
| } else { | ||
| quote! { | ||
| miette::LabeledSpan::new_with_span( | ||
| std::option::Option::None, | ||
| #field.clone(), | ||
| ) | ||
| } | ||
| } | ||
| }); | ||
| let variant_name = ident.clone(); | ||
| match &fields { | ||
| syn::Fields::Unit => None, | ||
| _ => Some(quote! { | ||
| Self::#variant_name #display_pat => std::option::Option::Some(std::boxed::Box::new(vec![ | ||
| #(#variant_labels),* | ||
| ].into_iter())), | ||
| }), | ||
| } | ||
| }) | ||
| }, | ||
| ) | ||
| } | ||
| } |
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