diff options
Diffstat (limited to 'compiler/rustc_parse/src/parser/attr.rs')
| -rw-r--r-- | compiler/rustc_parse/src/parser/attr.rs | 159 |
1 files changed, 68 insertions, 91 deletions
diff --git a/compiler/rustc_parse/src/parser/attr.rs b/compiler/rustc_parse/src/parser/attr.rs index 5fd69b15ecc..58be348883c 100644 --- a/compiler/rustc_parse/src/parser/attr.rs +++ b/compiler/rustc_parse/src/parser/attr.rs @@ -1,27 +1,26 @@ +use crate::errors::{InvalidMetaItem, SuffixedLiteralInAttribute}; + use super::{AttrWrapper, Capturing, FnParseMode, ForceCollect, Parser, PathStyle}; use rustc_ast as ast; use rustc_ast::attr; use rustc_ast::token::{self, Delimiter, Nonterminal}; -use rustc_ast_pretty::pprust; -use rustc_errors::{error_code, Diagnostic, PResult}; +use rustc_errors::{error_code, fluent, Diagnostic, IntoDiagnostic, PResult}; use rustc_span::{sym, BytePos, Span}; use std::convert::TryInto; // Public for rustfmt usage #[derive(Debug)] -pub enum InnerAttrPolicy<'a> { +pub enum InnerAttrPolicy { Permitted, - Forbidden { reason: &'a str, saw_doc_comment: bool, prev_outer_attr_sp: Option<Span> }, + Forbidden(Option<InnerAttrForbiddenReason>), } -const DEFAULT_UNEXPECTED_INNER_ATTR_ERR_MSG: &str = "an inner attribute is not \ - permitted in this context"; - -pub(super) const DEFAULT_INNER_ATTR_FORBIDDEN: InnerAttrPolicy<'_> = InnerAttrPolicy::Forbidden { - reason: DEFAULT_UNEXPECTED_INNER_ATTR_ERR_MSG, - saw_doc_comment: false, - prev_outer_attr_sp: None, -}; +#[derive(Clone, Copy, Debug)] +pub enum InnerAttrForbiddenReason { + InCodeBlock, + AfterOuterDocComment { prev_doc_comment_span: Span }, + AfterOuterAttribute { prev_outer_attr_sp: Span }, +} enum OuterAttributeType { DocComment, @@ -40,17 +39,15 @@ impl<'a> Parser<'a> { let prev_outer_attr_sp = outer_attrs.last().map(|attr| attr.span); let inner_error_reason = if just_parsed_doc_comment { - "an inner attribute is not permitted following an outer doc comment" - } else if prev_outer_attr_sp.is_some() { - "an inner attribute is not permitted following an outer attribute" + Some(InnerAttrForbiddenReason::AfterOuterDocComment { + prev_doc_comment_span: prev_outer_attr_sp.unwrap(), + }) + } else if let Some(prev_outer_attr_sp) = prev_outer_attr_sp { + Some(InnerAttrForbiddenReason::AfterOuterAttribute { prev_outer_attr_sp }) } else { - DEFAULT_UNEXPECTED_INNER_ATTR_ERR_MSG - }; - let inner_parse_policy = InnerAttrPolicy::Forbidden { - reason: inner_error_reason, - saw_doc_comment: just_parsed_doc_comment, - prev_outer_attr_sp, + None }; + let inner_parse_policy = InnerAttrPolicy::Forbidden(inner_error_reason); just_parsed_doc_comment = false; Some(self.parse_attribute(inner_parse_policy)?) } else if let token::DocComment(comment_kind, attr_style, data) = self.token.kind { @@ -58,7 +55,7 @@ impl<'a> Parser<'a> { let span = self.token.span; let mut err = self.sess.span_diagnostic.struct_span_err_with_code( span, - "expected outer doc comment", + fluent::parser::inner_doc_comment_not_permitted, error_code!(E0753), ); if let Some(replacement_span) = self.annotate_following_item_if_applicable( @@ -69,13 +66,10 @@ impl<'a> Parser<'a> { token::CommentKind::Block => OuterAttributeType::DocBlockComment, }, ) { - err.note( - "inner doc comments like this (starting with `//!` or `/*!`) can \ - only appear before items", - ); + err.note(fluent::parser::note); err.span_suggestion_verbose( replacement_span, - "you might have meant to write a regular comment", + fluent::parser::suggestion, "", rustc_errors::Applicability::MachineApplicable, ); @@ -113,7 +107,7 @@ impl<'a> Parser<'a> { // Public for rustfmt usage. pub fn parse_attribute( &mut self, - inner_parse_policy: InnerAttrPolicy<'_>, + inner_parse_policy: InnerAttrPolicy, ) -> PResult<'a, ast::Attribute> { debug!( "parse_attribute: inner_parse_policy={:?} self.token={:?}", @@ -122,35 +116,22 @@ impl<'a> Parser<'a> { let lo = self.token.span; // Attributes can't have attributes of their own [Editor's note: not with that attitude] self.collect_tokens_no_attrs(|this| { - if this.eat(&token::Pound) { - let style = if this.eat(&token::Not) { - ast::AttrStyle::Inner - } else { - ast::AttrStyle::Outer - }; + assert!(this.eat(&token::Pound), "parse_attribute called in non-attribute position"); - this.expect(&token::OpenDelim(Delimiter::Bracket))?; - let item = this.parse_attr_item(false)?; - this.expect(&token::CloseDelim(Delimiter::Bracket))?; - let attr_sp = lo.to(this.prev_token.span); + let style = + if this.eat(&token::Not) { ast::AttrStyle::Inner } else { ast::AttrStyle::Outer }; - // Emit error if inner attribute is encountered and forbidden. - if style == ast::AttrStyle::Inner { - this.error_on_forbidden_inner_attr(attr_sp, inner_parse_policy); - } + this.expect(&token::OpenDelim(Delimiter::Bracket))?; + let item = this.parse_attr_item(false)?; + this.expect(&token::CloseDelim(Delimiter::Bracket))?; + let attr_sp = lo.to(this.prev_token.span); - Ok(attr::mk_attr_from_item( - &self.sess.attr_id_generator, - item, - None, - style, - attr_sp, - )) - } else { - let token_str = pprust::token_to_string(&this.token); - let msg = &format!("expected `#`, found `{token_str}`"); - Err(this.struct_span_err(this.token.span, msg)) + // Emit error if inner attribute is encountered and forbidden. + if style == ast::AttrStyle::Inner { + this.error_on_forbidden_inner_attr(attr_sp, inner_parse_policy); } + + Ok(attr::mk_attr_from_item(&self.sess.attr_id_generator, item, None, style, attr_sp)) }) } @@ -190,21 +171,12 @@ impl<'a> Parser<'a> { ForceCollect::No, ) { Ok(Some(item)) => { - let attr_name = match attr_type { - OuterAttributeType::Attribute => "attribute", - _ => "doc comment", - }; - err.span_label( - item.span, - &format!("the inner {} doesn't annotate this {}", attr_name, item.kind.descr()), - ); + // FIXME(#100717) + err.set_arg("item", item.kind.descr()); + err.span_label(item.span, fluent::parser::label_does_not_annotate_this); err.span_suggestion_verbose( replacement_span, - &format!( - "to annotate the {}, change the {} from inner to outer style", - item.kind.descr(), - attr_name - ), + fluent::parser::sugg_change_inner_to_outer, match attr_type { OuterAttributeType::Attribute => "", OuterAttributeType::DocBlockComment => "*", @@ -222,22 +194,33 @@ impl<'a> Parser<'a> { Some(replacement_span) } - pub(super) fn error_on_forbidden_inner_attr(&self, attr_sp: Span, policy: InnerAttrPolicy<'_>) { - if let InnerAttrPolicy::Forbidden { reason, saw_doc_comment, prev_outer_attr_sp } = policy { - let prev_outer_attr_note = - if saw_doc_comment { "previous doc comment" } else { "previous outer attribute" }; - - let mut diag = self.struct_span_err(attr_sp, reason); - - if let Some(prev_outer_attr_sp) = prev_outer_attr_sp { - diag.span_label(attr_sp, "not permitted following an outer attribute") - .span_label(prev_outer_attr_sp, prev_outer_attr_note); - } + pub(super) fn error_on_forbidden_inner_attr(&self, attr_sp: Span, policy: InnerAttrPolicy) { + if let InnerAttrPolicy::Forbidden(reason) = policy { + let mut diag = match reason.as_ref().copied() { + Some(InnerAttrForbiddenReason::AfterOuterDocComment { prev_doc_comment_span }) => { + let mut diag = self.struct_span_err( + attr_sp, + fluent::parser::inner_attr_not_permitted_after_outer_doc_comment, + ); + diag.span_label(attr_sp, fluent::parser::label_attr) + .span_label(prev_doc_comment_span, fluent::parser::label_prev_doc_comment); + diag + } + Some(InnerAttrForbiddenReason::AfterOuterAttribute { prev_outer_attr_sp }) => { + let mut diag = self.struct_span_err( + attr_sp, + fluent::parser::inner_attr_not_permitted_after_outer_attr, + ); + diag.span_label(attr_sp, fluent::parser::label_attr) + .span_label(prev_outer_attr_sp, fluent::parser::label_prev_attr); + diag + } + Some(InnerAttrForbiddenReason::InCodeBlock) | None => { + self.struct_span_err(attr_sp, fluent::parser::inner_attr_not_permitted) + } + }; - diag.note( - "inner attributes, like `#![no_std]`, annotate the item enclosing them, and \ - are usually found at the beginning of source files", - ); + diag.note(fluent::parser::inner_attr_explanation); if self .annotate_following_item_if_applicable( &mut diag, @@ -246,7 +229,7 @@ impl<'a> Parser<'a> { ) .is_some() { - diag.note("outer attributes, like `#[test]`, annotate the item following them"); + diag.note(fluent::parser::outer_attr_explanation); }; diag.emit(); } @@ -337,12 +320,7 @@ impl<'a> Parser<'a> { debug!("checking if {:?} is unusuffixed", lit); if !lit.kind.is_unsuffixed() { - self.struct_span_err(lit.span, "suffixed literals are not allowed in attributes") - .help( - "instead of using a suffixed literal (`1u8`, `1.0f32`, etc.), \ - use an unsuffixed version (`1`, `1.0`, etc.)", - ) - .emit(); + self.sess.emit_err(SuffixedLiteralInAttribute { span: lit.span }); } Ok(lit) @@ -435,9 +413,8 @@ impl<'a> Parser<'a> { Err(err) => err.cancel(), } - let found = pprust::token_to_string(&self.token); - let msg = format!("expected unsuffixed literal or identifier, found `{found}`"); - Err(self.struct_span_err(self.token.span, &msg)) + Err(InvalidMetaItem { span: self.token.span, token: self.token.clone() } + .into_diagnostic(&self.sess.span_diagnostic)) } } |