Evan Almloff
386153672e
* add a warning for keys after the first node which do nothing * warnings on stable * better warnings on nightly
82 lines
2.3 KiB
Rust
82 lines
2.3 KiB
Rust
use proc_macro2_diagnostics::Diagnostic;
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use quote::ToTokens;
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/// A collection of diagnostics
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///
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/// This is a wrapper type since we want it to be transparent in terms of PartialEq and Eq.
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/// This also lets us choose the expansion strategy for the diagnostics.
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#[derive(Debug, Clone, Default)]
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pub struct Diagnostics {
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pub diagnostics: Vec<Diagnostic>,
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}
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impl Diagnostics {
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pub fn new() -> Self {
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Self {
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diagnostics: vec![],
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}
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}
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pub fn push(&mut self, diagnostic: Diagnostic) {
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self.diagnostics.push(diagnostic);
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}
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pub fn extend(&mut self, diagnostics: Vec<Diagnostic>) {
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self.diagnostics.extend(diagnostics);
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}
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pub fn is_empty(&self) -> bool {
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self.diagnostics.is_empty()
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}
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pub fn into_diagnostics(self) -> Vec<Diagnostic> {
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self.diagnostics
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}
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pub fn len(&self) -> usize {
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self.diagnostics.len()
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}
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}
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impl PartialEq for Diagnostics {
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fn eq(&self, _other: &Self) -> bool {
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true
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}
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}
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impl Eq for Diagnostics {}
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impl ToTokens for Diagnostics {
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fn to_tokens(&self, tokens: &mut proc_macro2::TokenStream) {
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for diagnostic in &self.diagnostics {
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tokens.extend(diagnostic.clone().emit_as_expr_tokens());
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}
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}
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}
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// TODO: Ideally this would be integrated into the existing diagnostics struct, but currently all fields are public so adding
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// new fields would be a breaking change. Diagnostics also doesn't expose the message directly so we can't just modify
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// the expansion
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pub(crate) mod new_diagnostics {
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use proc_macro2_diagnostics::SpanDiagnosticExt;
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use std::fmt::Display;
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use proc_macro2::{Span, TokenStream as TokenStream2};
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use quote::quote_spanned;
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pub(crate) fn warning_diagnostic(span: Span, message: impl Display) -> TokenStream2 {
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let note = message.to_string();
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// If we are compiling on nightly, use diagnostics directly which supports proper warnings through new span apis
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if rustversion::cfg!(nightly) {
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return span.warning(note).emit_as_item_tokens();
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}
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quote_spanned! { span =>
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const _: () = {
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#[deprecated(note = #note)]
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struct Warning;
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_ = Warning;
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};
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}
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}
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}
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