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| 1 | +#![allow(warnings)] |
| 2 | +use rustc_hir::attrs::diagnostic::OnUnimplementedDirective; |
| 3 | +use rustc_hir::lints::AttributeLintKind; |
| 4 | +use rustc_session::lint::builtin::{ |
| 5 | + MALFORMED_DIAGNOSTIC_ATTRIBUTES, MALFORMED_DIAGNOSTIC_FORMAT_LITERALS, |
| 6 | +}; |
| 7 | +use thin_vec::thin_vec; |
| 8 | + |
| 9 | +use crate::attributes::diagnostic::*; |
| 10 | +use crate::attributes::prelude::*; |
| 11 | +use crate::attributes::template; |
| 12 | +/// Folds all uses of `#[rustc_on_unimplemented]` and `#[diagnostic::on_unimplemented]`. |
| 13 | +/// TODO: example |
| 14 | +#[derive(Default)] |
| 15 | +pub struct OnUnimplementedParser { |
| 16 | + directive: Option<(Span, OnUnimplementedDirective)>, |
| 17 | +} |
| 18 | + |
| 19 | +impl<S: Stage> AttributeParser<S> for OnUnimplementedParser { |
| 20 | + const ATTRIBUTES: AcceptMapping<Self, S> = &[ |
| 21 | + (&[sym::diagnostic, sym::on_unimplemented], template!(Word), |this, cx, args| { |
| 22 | + let span = cx.attr_span; |
| 23 | + |
| 24 | + let items = match args { |
| 25 | + ArgParser::List(items) => items, |
| 26 | + ArgParser::NoArgs => { |
| 27 | + cx.emit_lint( |
| 28 | + MALFORMED_DIAGNOSTIC_ATTRIBUTES, |
| 29 | + AttributeLintKind::MissingOptionsForOnUnimplemented, |
| 30 | + span, |
| 31 | + ); |
| 32 | + return; |
| 33 | + } |
| 34 | + ArgParser::NameValue(_) => { |
| 35 | + cx.emit_lint( |
| 36 | + MALFORMED_DIAGNOSTIC_ATTRIBUTES, |
| 37 | + AttributeLintKind::MalformedOnUnimplementedAttr { span }, |
| 38 | + span, |
| 39 | + ); |
| 40 | + return; |
| 41 | + } |
| 42 | + }; |
| 43 | + |
| 44 | + let Some(directive) = parse_directive_items(cx, Ctx::DiagnosticOnUnimplemented, items) |
| 45 | + else { |
| 46 | + return; |
| 47 | + }; |
| 48 | + merge_directives(cx, &mut this.directive, (span, directive)); |
| 49 | + }), |
| 50 | + // todo (&[sym::rustc_on_unimplemented], template!(Word), |this, cx, args| {}), |
| 51 | + ]; |
| 52 | + const ALLOWED_TARGETS: AllowedTargets = AllowedTargets::AllowList(ALL_TARGETS); |
| 53 | + |
| 54 | + fn finalize(mut self, cx: &FinalizeContext<'_, '_, S>) -> Option<AttributeKind> { |
| 55 | + self.directive.map(|(span, directive)| AttributeKind::OnUnimplemented { |
| 56 | + span, |
| 57 | + directive: Some(Box::new(directive)), |
| 58 | + }) |
| 59 | + } |
| 60 | +} |
| 61 | + |
| 62 | +fn merge_directives<S: Stage>( |
| 63 | + cx: &mut AcceptContext<'_, '_, S>, |
| 64 | + first: &mut Option<(Span, OnUnimplementedDirective)>, |
| 65 | + later: (Span, OnUnimplementedDirective), |
| 66 | +) { |
| 67 | + if let Some((first_span, first)) = first { |
| 68 | + merge(cx, &mut first.message, later.1.message, "message"); |
| 69 | + merge(cx, &mut first.label, later.1.label, "label"); |
| 70 | + first.notes.extend(later.1.notes); |
| 71 | + } else { |
| 72 | + *first = Some(later); |
| 73 | + } |
| 74 | +} |
| 75 | + |
| 76 | +fn merge<T, S: Stage>( |
| 77 | + cx: &mut AcceptContext<'_, '_, S>, |
| 78 | + first: &mut Option<(Span, T)>, |
| 79 | + later: Option<(Span, T)>, |
| 80 | + option_name: &'static str, |
| 81 | +) { |
| 82 | + match (first, later) { |
| 83 | + (Some(_) | None, None) => {} |
| 84 | + (Some((first_span, _)), Some((later_span, _))) => { |
| 85 | + cx.emit_lint( |
| 86 | + MALFORMED_DIAGNOSTIC_ATTRIBUTES, |
| 87 | + AttributeLintKind::IgnoredDiagnosticOption { |
| 88 | + first_span: *first_span, |
| 89 | + later_span, |
| 90 | + option_name, |
| 91 | + }, |
| 92 | + later_span, |
| 93 | + ); |
| 94 | + } |
| 95 | + (first @ None, Some(later)) => { |
| 96 | + first.get_or_insert(later); |
| 97 | + } |
| 98 | + } |
| 99 | +} |
| 100 | + |
| 101 | +fn parse_directive_items<S: Stage>( |
| 102 | + cx: &mut AcceptContext<S>, |
| 103 | + ctx: Ctx, |
| 104 | + items: &MetaItemListParser, |
| 105 | +) -> Option<OnUnimplementedDirective> { |
| 106 | + let condition = None; |
| 107 | + let mut message = None; |
| 108 | + let mut label = None; |
| 109 | + let mut notes = ThinVec::new(); |
| 110 | + let mut parent_label = None; |
| 111 | + let mut subcommands = ThinVec::new(); |
| 112 | + let mut append_const_msg = None; |
| 113 | + |
| 114 | + for item in items.mixed() { |
| 115 | + // At this point, we are expecting any of: |
| 116 | + // message = "..", label = "..", note = ".." |
| 117 | + let Some((name, value, value_span)) = (try { |
| 118 | + let item = item.meta_item()?; |
| 119 | + let name = item.ident()?.name; |
| 120 | + let nv = item.args().name_value()?; |
| 121 | + let value = nv.value_as_str()?; |
| 122 | + (name, value, nv.value_span) |
| 123 | + }) else { |
| 124 | + let span = item.span(); |
| 125 | + cx.emit_lint( |
| 126 | + MALFORMED_DIAGNOSTIC_ATTRIBUTES, |
| 127 | + AttributeLintKind::MalformedOnUnimplementedAttr { span }, |
| 128 | + span, |
| 129 | + ); |
| 130 | + continue; |
| 131 | + }; |
| 132 | + |
| 133 | + let mut parse = |input| { |
| 134 | + let snippet = cx.sess.source_map().span_to_snippet(value_span).ok(); |
| 135 | + match parse_format_string(input, snippet, value_span, ctx) { |
| 136 | + Ok((f, warnings)) => { |
| 137 | + for warning in warnings { |
| 138 | + let (FormatWarning::InvalidSpecifier { span, .. } |
| 139 | + | FormatWarning::PositionalArgument { span, .. }) = warning; |
| 140 | + cx.emit_lint( |
| 141 | + MALFORMED_DIAGNOSTIC_FORMAT_LITERALS, |
| 142 | + AttributeLintKind::MalformedDiagnosticFormat { warning }, |
| 143 | + span, |
| 144 | + ); |
| 145 | + } |
| 146 | + |
| 147 | + f |
| 148 | + } |
| 149 | + Err(e) => { |
| 150 | + cx.emit_lint( |
| 151 | + MALFORMED_DIAGNOSTIC_FORMAT_LITERALS, |
| 152 | + AttributeLintKind::DiagnosticWrappedParserError { |
| 153 | + description: e.description, |
| 154 | + label: e.label, |
| 155 | + }, |
| 156 | + value_span, |
| 157 | + ); |
| 158 | + // We could not parse the input, just use it as-is. |
| 159 | + FormatString { input, span: value_span, pieces: thin_vec![Piece::Lit(input)] } |
| 160 | + } |
| 161 | + } |
| 162 | + }; |
| 163 | + match name { |
| 164 | + sym::message => { |
| 165 | + if message.is_none() { |
| 166 | + message.insert((item.span(), parse(value))); |
| 167 | + } else { |
| 168 | + // warn |
| 169 | + } |
| 170 | + } |
| 171 | + sym::label => { |
| 172 | + if label.is_none() { |
| 173 | + label.insert((item.span(), parse(value))); |
| 174 | + } else { |
| 175 | + // warn |
| 176 | + } |
| 177 | + } |
| 178 | + sym::note => notes.push(parse(value)), |
| 179 | + _other => { |
| 180 | + let span = item.span(); |
| 181 | + cx.emit_lint( |
| 182 | + MALFORMED_DIAGNOSTIC_ATTRIBUTES, |
| 183 | + AttributeLintKind::MalformedOnUnimplementedAttr { span }, |
| 184 | + span, |
| 185 | + ); |
| 186 | + continue; |
| 187 | + } |
| 188 | + } |
| 189 | + } |
| 190 | + |
| 191 | + Some(OnUnimplementedDirective { |
| 192 | + condition, |
| 193 | + subcommands, |
| 194 | + message, |
| 195 | + label, |
| 196 | + notes, |
| 197 | + parent_label, |
| 198 | + append_const_msg, |
| 199 | + }) |
| 200 | +} |
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