684 lines
24 KiB
Rust
684 lines
24 KiB
Rust
use crate::diagnostics::error::{
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span_err, throw_invalid_attr, throw_invalid_nested_attr, throw_span_err, DiagnosticDeriveError,
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};
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use proc_macro::Span;
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use proc_macro2::TokenStream;
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use quote::{format_ident, quote, ToTokens};
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use std::cmp::Ordering;
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use std::collections::{BTreeSet, HashMap};
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use std::fmt;
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use std::str::FromStr;
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use syn::{spanned::Spanned, Attribute, Field, Meta, Type, TypeTuple};
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use syn::{MetaList, MetaNameValue, NestedMeta, Path};
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use synstructure::{BindStyle, BindingInfo, VariantInfo};
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use super::error::invalid_nested_attr;
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/// Checks whether the type name of `ty` matches `name`.
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///
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/// Given some struct at `a::b::c::Foo`, this will return true for `c::Foo`, `b::c::Foo`, or
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/// `a::b::c::Foo`. This reasonably allows qualified names to be used in the macro.
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pub(crate) fn type_matches_path(ty: &Type, name: &[&str]) -> bool {
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if let Type::Path(ty) = ty {
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ty.path
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.segments
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.iter()
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.map(|s| s.ident.to_string())
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.rev()
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.zip(name.iter().rev())
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.all(|(x, y)| &x.as_str() == y)
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} else {
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false
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}
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}
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/// Checks whether the type `ty` is `()`.
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pub(crate) fn type_is_unit(ty: &Type) -> bool {
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if let Type::Tuple(TypeTuple { elems, .. }) = ty { elems.is_empty() } else { false }
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}
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/// Reports a type error for field with `attr`.
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pub(crate) fn report_type_error(
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attr: &Attribute,
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ty_name: &str,
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) -> Result<!, DiagnosticDeriveError> {
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let name = attr.path.segments.last().unwrap().ident.to_string();
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let meta = attr.parse_meta()?;
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throw_span_err!(
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attr.span().unwrap(),
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&format!(
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"the `#[{}{}]` attribute can only be applied to fields of type {}",
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name,
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match meta {
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Meta::Path(_) => "",
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Meta::NameValue(_) => " = ...",
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Meta::List(_) => "(...)",
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},
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ty_name
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)
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);
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}
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/// Reports an error if the field's type does not match `path`.
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fn report_error_if_not_applied_to_ty(
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attr: &Attribute,
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info: &FieldInfo<'_>,
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path: &[&str],
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ty_name: &str,
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) -> Result<(), DiagnosticDeriveError> {
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if !type_matches_path(&info.ty, path) {
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report_type_error(attr, ty_name)?;
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}
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Ok(())
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}
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/// Reports an error if the field's type is not `Applicability`.
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pub(crate) fn report_error_if_not_applied_to_applicability(
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attr: &Attribute,
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info: &FieldInfo<'_>,
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) -> Result<(), DiagnosticDeriveError> {
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report_error_if_not_applied_to_ty(
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attr,
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info,
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&["rustc_errors", "Applicability"],
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"`Applicability`",
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)
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}
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/// Reports an error if the field's type is not `Span`.
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pub(crate) fn report_error_if_not_applied_to_span(
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attr: &Attribute,
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info: &FieldInfo<'_>,
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) -> Result<(), DiagnosticDeriveError> {
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if !type_matches_path(&info.ty, &["rustc_span", "Span"])
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&& !type_matches_path(&info.ty, &["rustc_errors", "MultiSpan"])
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{
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report_type_error(attr, "`Span` or `MultiSpan`")?;
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}
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Ok(())
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}
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/// Inner type of a field and type of wrapper.
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pub(crate) enum FieldInnerTy<'ty> {
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/// Field is wrapped in a `Option<$inner>`.
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Option(&'ty Type),
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/// Field is wrapped in a `Vec<$inner>`.
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Vec(&'ty Type),
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/// Field isn't wrapped in an outer type.
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None,
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}
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impl<'ty> FieldInnerTy<'ty> {
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/// Returns inner type for a field, if there is one.
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///
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/// - If `ty` is an `Option`, returns `FieldInnerTy::Option { inner: (inner type) }`.
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/// - If `ty` is a `Vec`, returns `FieldInnerTy::Vec { inner: (inner type) }`.
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/// - Otherwise returns `None`.
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pub(crate) fn from_type(ty: &'ty Type) -> Self {
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let variant: &dyn Fn(&'ty Type) -> FieldInnerTy<'ty> =
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if type_matches_path(ty, &["std", "option", "Option"]) {
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&FieldInnerTy::Option
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} else if type_matches_path(ty, &["std", "vec", "Vec"]) {
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&FieldInnerTy::Vec
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} else {
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return FieldInnerTy::None;
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};
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if let Type::Path(ty_path) = ty {
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let path = &ty_path.path;
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let ty = path.segments.iter().last().unwrap();
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if let syn::PathArguments::AngleBracketed(bracketed) = &ty.arguments {
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if bracketed.args.len() == 1 {
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if let syn::GenericArgument::Type(ty) = &bracketed.args[0] {
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return variant(ty);
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}
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}
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}
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}
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unreachable!();
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}
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/// Returns `Option` containing inner type if there is one.
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pub(crate) fn inner_type(&self) -> Option<&'ty Type> {
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match self {
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FieldInnerTy::Option(inner) | FieldInnerTy::Vec(inner) => Some(inner),
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FieldInnerTy::None => None,
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}
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}
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/// Surrounds `inner` with destructured wrapper type, exposing inner type as `binding`.
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pub(crate) fn with(&self, binding: impl ToTokens, inner: impl ToTokens) -> TokenStream {
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match self {
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FieldInnerTy::Option(..) => quote! {
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if let Some(#binding) = #binding {
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#inner
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}
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},
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FieldInnerTy::Vec(..) => quote! {
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for #binding in #binding {
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#inner
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}
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},
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FieldInnerTy::None => quote! { #inner },
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}
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}
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}
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/// Field information passed to the builder. Deliberately omits attrs to discourage the
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/// `generate_*` methods from walking the attributes themselves.
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pub(crate) struct FieldInfo<'a> {
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pub(crate) binding: &'a BindingInfo<'a>,
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pub(crate) ty: &'a Type,
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pub(crate) span: &'a proc_macro2::Span,
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}
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/// Small helper trait for abstracting over `Option` fields that contain a value and a `Span`
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/// for error reporting if they are set more than once.
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pub(crate) trait SetOnce<T> {
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fn set_once(&mut self, value: T, span: Span);
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fn value(self) -> Option<T>;
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fn value_ref(&self) -> Option<&T>;
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}
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/// An [`Option<T>`] that keeps track of the span that caused it to be set; used with [`SetOnce`].
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pub(super) type SpannedOption<T> = Option<(T, Span)>;
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impl<T> SetOnce<T> for SpannedOption<T> {
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fn set_once(&mut self, value: T, span: Span) {
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match self {
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None => {
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*self = Some((value, span));
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}
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Some((_, prev_span)) => {
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span_err(span, "specified multiple times")
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.span_note(*prev_span, "previously specified here")
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.emit();
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}
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}
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}
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fn value(self) -> Option<T> {
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self.map(|(v, _)| v)
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}
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fn value_ref(&self) -> Option<&T> {
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self.as_ref().map(|(v, _)| v)
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}
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}
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pub(super) type FieldMap = HashMap<String, TokenStream>;
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pub(crate) trait HasFieldMap {
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/// Returns the binding for the field with the given name, if it exists on the type.
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fn get_field_binding(&self, field: &String) -> Option<&TokenStream>;
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/// In the strings in the attributes supplied to this macro, we want callers to be able to
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/// reference fields in the format string. For example:
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///
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/// ```ignore (not-usage-example)
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/// /// Suggest `==` when users wrote `===`.
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/// #[suggestion(slug = "parser-not-javascript-eq", code = "{lhs} == {rhs}")]
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/// struct NotJavaScriptEq {
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/// #[primary_span]
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/// span: Span,
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/// lhs: Ident,
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/// rhs: Ident,
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/// }
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/// ```
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///
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/// We want to automatically pick up that `{lhs}` refers `self.lhs` and `{rhs}` refers to
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/// `self.rhs`, then generate this call to `format!`:
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///
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/// ```ignore (not-usage-example)
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/// format!("{lhs} == {rhs}", lhs = self.lhs, rhs = self.rhs)
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/// ```
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///
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/// This function builds the entire call to `format!`.
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fn build_format(&self, input: &str, span: proc_macro2::Span) -> TokenStream {
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// This set is used later to generate the final format string. To keep builds reproducible,
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// the iteration order needs to be deterministic, hence why we use a `BTreeSet` here
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// instead of a `HashSet`.
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let mut referenced_fields: BTreeSet<String> = BTreeSet::new();
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// At this point, we can start parsing the format string.
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let mut it = input.chars().peekable();
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// Once the start of a format string has been found, process the format string and spit out
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// the referenced fields. Leaves `it` sitting on the closing brace of the format string, so
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// the next call to `it.next()` retrieves the next character.
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while let Some(c) = it.next() {
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if c != '{' {
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continue;
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}
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if *it.peek().unwrap_or(&'\0') == '{' {
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assert_eq!(it.next().unwrap(), '{');
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continue;
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}
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let mut eat_argument = || -> Option<String> {
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let mut result = String::new();
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// Format specifiers look like:
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//
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// format := '{' [ argument ] [ ':' format_spec ] '}' .
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//
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// Therefore, we only need to eat until ':' or '}' to find the argument.
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while let Some(c) = it.next() {
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result.push(c);
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let next = *it.peek().unwrap_or(&'\0');
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if next == '}' {
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break;
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} else if next == ':' {
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// Eat the ':' character.
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assert_eq!(it.next().unwrap(), ':');
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break;
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}
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}
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// Eat until (and including) the matching '}'
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while it.next()? != '}' {
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continue;
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}
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Some(result)
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};
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if let Some(referenced_field) = eat_argument() {
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referenced_fields.insert(referenced_field);
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}
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}
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// At this point, `referenced_fields` contains a set of the unique fields that were
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// referenced in the format string. Generate the corresponding "x = self.x" format
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// string parameters:
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let args = referenced_fields.into_iter().map(|field: String| {
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let field_ident = format_ident!("{}", field);
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let value = match self.get_field_binding(&field) {
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Some(value) => value.clone(),
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// This field doesn't exist. Emit a diagnostic.
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None => {
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span_err(
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span.unwrap(),
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&format!("`{}` doesn't refer to a field on this type", field),
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)
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.emit();
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quote! {
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"{#field}"
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}
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}
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};
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quote! {
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#field_ident = #value
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}
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});
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quote! {
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format!(#input #(,#args)*)
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}
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}
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}
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/// `Applicability` of a suggestion - mirrors `rustc_errors::Applicability` - and used to represent
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/// the user's selection of applicability if specified in an attribute.
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#[derive(Clone, Copy)]
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pub(crate) enum Applicability {
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MachineApplicable,
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MaybeIncorrect,
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HasPlaceholders,
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Unspecified,
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}
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impl FromStr for Applicability {
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type Err = ();
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fn from_str(s: &str) -> Result<Self, Self::Err> {
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match s {
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"machine-applicable" => Ok(Applicability::MachineApplicable),
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"maybe-incorrect" => Ok(Applicability::MaybeIncorrect),
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"has-placeholders" => Ok(Applicability::HasPlaceholders),
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"unspecified" => Ok(Applicability::Unspecified),
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_ => Err(()),
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}
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}
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}
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impl quote::ToTokens for Applicability {
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fn to_tokens(&self, tokens: &mut TokenStream) {
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tokens.extend(match self {
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Applicability::MachineApplicable => {
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quote! { rustc_errors::Applicability::MachineApplicable }
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}
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Applicability::MaybeIncorrect => {
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quote! { rustc_errors::Applicability::MaybeIncorrect }
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}
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Applicability::HasPlaceholders => {
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quote! { rustc_errors::Applicability::HasPlaceholders }
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}
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Applicability::Unspecified => {
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quote! { rustc_errors::Applicability::Unspecified }
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}
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});
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}
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}
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/// Build the mapping of field names to fields. This allows attributes to peek values from
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/// other fields.
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pub(super) fn build_field_mapping<'v>(variant: &VariantInfo<'v>) -> HashMap<String, TokenStream> {
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let mut fields_map = FieldMap::new();
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for binding in variant.bindings() {
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if let Some(ident) = &binding.ast().ident {
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fields_map.insert(ident.to_string(), quote! { #binding });
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}
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}
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fields_map
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}
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/// Possible styles for suggestion subdiagnostics.
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#[derive(Clone, Copy)]
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pub(super) enum SuggestionKind {
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/// `#[suggestion]`
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Normal,
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/// `#[suggestion_short]`
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Short,
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/// `#[suggestion_hidden]`
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Hidden,
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/// `#[suggestion_verbose]`
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Verbose,
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}
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impl FromStr for SuggestionKind {
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type Err = ();
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fn from_str(s: &str) -> Result<Self, Self::Err> {
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match s {
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"" => Ok(SuggestionKind::Normal),
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"_short" => Ok(SuggestionKind::Short),
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"_hidden" => Ok(SuggestionKind::Hidden),
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"_verbose" => Ok(SuggestionKind::Verbose),
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_ => Err(()),
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}
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}
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}
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impl SuggestionKind {
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pub fn to_suggestion_style(&self) -> TokenStream {
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match self {
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SuggestionKind::Normal => {
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quote! { rustc_errors::SuggestionStyle::ShowCode }
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}
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SuggestionKind::Short => {
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quote! { rustc_errors::SuggestionStyle::HideCodeInline }
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}
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SuggestionKind::Hidden => {
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quote! { rustc_errors::SuggestionStyle::HideCodeAlways }
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}
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SuggestionKind::Verbose => {
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quote! { rustc_errors::SuggestionStyle::ShowAlways }
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}
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}
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}
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}
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/// Types of subdiagnostics that can be created using attributes
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#[derive(Clone)]
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pub(super) enum SubdiagnosticKind {
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/// `#[label(...)]`
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Label,
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/// `#[note(...)]`
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Note,
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/// `#[help(...)]`
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Help,
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/// `#[warning(...)]`
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Warn,
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/// `#[suggestion{,_short,_hidden,_verbose}]`
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Suggestion {
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suggestion_kind: SuggestionKind,
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applicability: SpannedOption<Applicability>,
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code: TokenStream,
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},
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/// `#[multipart_suggestion{,_short,_hidden,_verbose}]`
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MultipartSuggestion {
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suggestion_kind: SuggestionKind,
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applicability: SpannedOption<Applicability>,
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},
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}
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impl SubdiagnosticKind {
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/// Constructs a `SubdiagnosticKind` from a field or type attribute such as `#[note]`,
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/// `#[error(parser::add_paren)]` or `#[suggestion(code = "...")]`. Returns the
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/// `SubdiagnosticKind` and the diagnostic slug, if specified.
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pub(super) fn from_attr(
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attr: &Attribute,
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fields: &impl HasFieldMap,
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) -> Result<(SubdiagnosticKind, Option<Path>), DiagnosticDeriveError> {
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let span = attr.span().unwrap();
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let name = attr.path.segments.last().unwrap().ident.to_string();
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let name = name.as_str();
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let meta = attr.parse_meta()?;
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let mut kind = match name {
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"label" => SubdiagnosticKind::Label,
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"note" => SubdiagnosticKind::Note,
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"help" => SubdiagnosticKind::Help,
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"warning" => SubdiagnosticKind::Warn,
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_ => {
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if let Some(suggestion_kind) =
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name.strip_prefix("suggestion").and_then(|s| s.parse().ok())
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{
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SubdiagnosticKind::Suggestion {
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suggestion_kind,
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applicability: None,
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code: TokenStream::new(),
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}
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} else if let Some(suggestion_kind) =
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name.strip_prefix("multipart_suggestion").and_then(|s| s.parse().ok())
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{
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SubdiagnosticKind::MultipartSuggestion { suggestion_kind, applicability: None }
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} else {
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throw_invalid_attr!(attr, &meta);
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}
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}
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};
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|
let nested = match meta {
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|
Meta::List(MetaList { ref nested, .. }) => {
|
|
// An attribute with properties, such as `#[suggestion(code = "...")]` or
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// `#[error(some::slug)]`
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nested
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}
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Meta::Path(_) => {
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|
// An attribute without a slug or other properties, such as `#[note]` - return
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// without further processing.
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//
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// Only allow this if there are no mandatory properties, such as `code = "..."` in
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// `#[suggestion(...)]`
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match kind {
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SubdiagnosticKind::Label
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| SubdiagnosticKind::Note
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| SubdiagnosticKind::Help
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| SubdiagnosticKind::Warn
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| SubdiagnosticKind::MultipartSuggestion { .. } => return Ok((kind, None)),
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SubdiagnosticKind::Suggestion { .. } => {
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throw_span_err!(span, "suggestion without `code = \"...\"`")
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}
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}
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}
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|
_ => {
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throw_invalid_attr!(attr, &meta)
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}
|
|
};
|
|
|
|
let mut code = None;
|
|
|
|
let mut nested_iter = nested.into_iter().peekable();
|
|
|
|
// Peek at the first nested attribute: if it's a slug path, consume it.
|
|
let slug = if let Some(NestedMeta::Meta(Meta::Path(path))) = nested_iter.peek() {
|
|
let path = path.clone();
|
|
// Advance the iterator.
|
|
nested_iter.next();
|
|
Some(path)
|
|
} else {
|
|
None
|
|
};
|
|
|
|
for nested_attr in nested_iter {
|
|
let meta = match nested_attr {
|
|
NestedMeta::Meta(ref meta) => meta,
|
|
NestedMeta::Lit(_) => {
|
|
invalid_nested_attr(attr, &nested_attr).emit();
|
|
continue;
|
|
}
|
|
};
|
|
|
|
let span = meta.span().unwrap();
|
|
let nested_name = meta.path().segments.last().unwrap().ident.to_string();
|
|
let nested_name = nested_name.as_str();
|
|
|
|
let value = match meta {
|
|
Meta::NameValue(MetaNameValue { lit: syn::Lit::Str(value), .. }) => value,
|
|
Meta::Path(_) => throw_invalid_nested_attr!(attr, &nested_attr, |diag| {
|
|
diag.help("a diagnostic slug must be the first argument to the attribute")
|
|
}),
|
|
_ => {
|
|
invalid_nested_attr(attr, &nested_attr).emit();
|
|
continue;
|
|
}
|
|
};
|
|
|
|
match (nested_name, &mut kind) {
|
|
("code", SubdiagnosticKind::Suggestion { .. }) => {
|
|
let formatted_str = fields.build_format(&value.value(), value.span());
|
|
code.set_once(formatted_str, span);
|
|
}
|
|
(
|
|
"applicability",
|
|
SubdiagnosticKind::Suggestion { ref mut applicability, .. }
|
|
| SubdiagnosticKind::MultipartSuggestion { ref mut applicability, .. },
|
|
) => {
|
|
let value = Applicability::from_str(&value.value()).unwrap_or_else(|()| {
|
|
span_err(span, "invalid applicability").emit();
|
|
Applicability::Unspecified
|
|
});
|
|
applicability.set_once(value, span);
|
|
}
|
|
|
|
// Invalid nested attribute
|
|
(_, SubdiagnosticKind::Suggestion { .. }) => {
|
|
invalid_nested_attr(attr, &nested_attr)
|
|
.help("only `code` and `applicability` are valid nested attributes")
|
|
.emit();
|
|
}
|
|
(_, SubdiagnosticKind::MultipartSuggestion { .. }) => {
|
|
invalid_nested_attr(attr, &nested_attr)
|
|
.help("only `applicability` is a valid nested attributes")
|
|
.emit()
|
|
}
|
|
_ => {
|
|
invalid_nested_attr(attr, &nested_attr).emit();
|
|
}
|
|
}
|
|
}
|
|
|
|
match kind {
|
|
SubdiagnosticKind::Suggestion { code: ref mut code_field, .. } => {
|
|
*code_field = if let Some((code, _)) = code {
|
|
code
|
|
} else {
|
|
span_err(span, "suggestion without `code = \"...\"`").emit();
|
|
quote! { "" }
|
|
}
|
|
}
|
|
SubdiagnosticKind::Label
|
|
| SubdiagnosticKind::Note
|
|
| SubdiagnosticKind::Help
|
|
| SubdiagnosticKind::Warn
|
|
| SubdiagnosticKind::MultipartSuggestion { .. } => {}
|
|
}
|
|
|
|
Ok((kind, slug))
|
|
}
|
|
}
|
|
|
|
impl quote::IdentFragment for SubdiagnosticKind {
|
|
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
|
|
match self {
|
|
SubdiagnosticKind::Label => write!(f, "label"),
|
|
SubdiagnosticKind::Note => write!(f, "note"),
|
|
SubdiagnosticKind::Help => write!(f, "help"),
|
|
SubdiagnosticKind::Warn => write!(f, "warn"),
|
|
SubdiagnosticKind::Suggestion { .. } => write!(f, "suggestion_with_style"),
|
|
SubdiagnosticKind::MultipartSuggestion { .. } => {
|
|
write!(f, "multipart_suggestion_with_style")
|
|
}
|
|
}
|
|
}
|
|
|
|
fn span(&self) -> Option<proc_macro2::Span> {
|
|
None
|
|
}
|
|
}
|
|
|
|
/// Wrapper around `synstructure::BindStyle` which implements `Ord`.
|
|
#[derive(PartialEq, Eq)]
|
|
pub(super) struct OrderedBindStyle(pub(super) BindStyle);
|
|
|
|
impl OrderedBindStyle {
|
|
/// Is `BindStyle::Move` or `BindStyle::MoveMut`?
|
|
pub(super) fn is_move(&self) -> bool {
|
|
matches!(self.0, BindStyle::Move | BindStyle::MoveMut)
|
|
}
|
|
}
|
|
|
|
impl Ord for OrderedBindStyle {
|
|
fn cmp(&self, other: &Self) -> Ordering {
|
|
match (self.is_move(), other.is_move()) {
|
|
// If both `self` and `other` are the same, then ordering is equal.
|
|
(true, true) | (false, false) => Ordering::Equal,
|
|
// If `self` is not a move then it should be considered less than `other` (so that
|
|
// references are sorted first).
|
|
(false, _) => Ordering::Less,
|
|
// If `self` is a move then it must be greater than `other` (again, so that references
|
|
// are sorted first).
|
|
(true, _) => Ordering::Greater,
|
|
}
|
|
}
|
|
}
|
|
|
|
impl PartialOrd for OrderedBindStyle {
|
|
fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
|
|
Some(self.cmp(other))
|
|
}
|
|
}
|
|
|
|
/// Returns `true` if `field` should generate a `set_arg` call rather than any other diagnostic
|
|
/// call (like `span_label`).
|
|
pub(super) fn should_generate_set_arg(field: &Field) -> bool {
|
|
field.attrs.is_empty()
|
|
}
|
|
|
|
/// Returns `true` if `field` needs to have code generated in the by-move branch of the
|
|
/// generated derive rather than the by-ref branch.
|
|
pub(super) fn bind_style_of_field(field: &Field) -> OrderedBindStyle {
|
|
let generates_set_arg = should_generate_set_arg(field);
|
|
let is_multispan = type_matches_path(&field.ty, &["rustc_errors", "MultiSpan"]);
|
|
// FIXME(davidtwco): better support for one field needing to be in the by-move and
|
|
// by-ref branches.
|
|
let is_subdiagnostic = field
|
|
.attrs
|
|
.iter()
|
|
.map(|attr| attr.path.segments.last().unwrap().ident.to_string())
|
|
.any(|attr| attr == "subdiagnostic");
|
|
|
|
// `set_arg` calls take their argument by-move..
|
|
let needs_move = generates_set_arg
|
|
// If this is a `MultiSpan` field then it needs to be moved to be used by any
|
|
// attribute..
|
|
|| is_multispan
|
|
// If this a `#[subdiagnostic]` then it needs to be moved as the other diagnostic is
|
|
// unlikely to be `Copy`..
|
|
|| is_subdiagnostic;
|
|
|
|
OrderedBindStyle(if needs_move { BindStyle::Move } else { BindStyle::Ref })
|
|
}
|