504 lines
16 KiB
Rust
504 lines
16 KiB
Rust
use crate::CodeSuggestion;
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use crate::SuggestionStyle;
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use crate::SubstitutionPart;
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use crate::Substitution;
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use crate::Applicability;
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use crate::Level;
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use crate::snippet::Style;
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use std::fmt;
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use syntax_pos::{MultiSpan, Span};
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#[must_use]
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#[derive(Clone, Debug, PartialEq, Hash, RustcEncodable, RustcDecodable)]
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pub struct Diagnostic {
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pub level: Level,
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pub message: Vec<(String, Style)>,
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pub code: Option<DiagnosticId>,
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pub span: MultiSpan,
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pub children: Vec<SubDiagnostic>,
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pub suggestions: Vec<CodeSuggestion>,
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}
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#[derive(Clone, Debug, PartialEq, Eq, Hash, RustcEncodable, RustcDecodable)]
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pub enum DiagnosticId {
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Error(String),
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Lint(String),
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}
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/// For example a note attached to an error.
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#[derive(Clone, Debug, PartialEq, Hash, RustcEncodable, RustcDecodable)]
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pub struct SubDiagnostic {
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pub level: Level,
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pub message: Vec<(String, Style)>,
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pub span: MultiSpan,
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pub render_span: Option<MultiSpan>,
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}
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#[derive(PartialEq, Eq)]
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pub struct DiagnosticStyledString(pub Vec<StringPart>);
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impl DiagnosticStyledString {
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pub fn new() -> DiagnosticStyledString {
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DiagnosticStyledString(vec![])
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}
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pub fn push_normal<S: Into<String>>(&mut self, t: S) {
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self.0.push(StringPart::Normal(t.into()));
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}
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pub fn push_highlighted<S: Into<String>>(&mut self, t: S) {
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self.0.push(StringPart::Highlighted(t.into()));
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}
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pub fn normal<S: Into<String>>(t: S) -> DiagnosticStyledString {
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DiagnosticStyledString(vec![StringPart::Normal(t.into())])
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}
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pub fn highlighted<S: Into<String>>(t: S) -> DiagnosticStyledString {
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DiagnosticStyledString(vec![StringPart::Highlighted(t.into())])
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}
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pub fn content(&self) -> String {
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self.0.iter().map(|x| x.content()).collect::<String>()
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}
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}
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#[derive(PartialEq, Eq)]
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pub enum StringPart {
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Normal(String),
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Highlighted(String),
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}
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impl StringPart {
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pub fn content(&self) -> &str {
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match self {
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&StringPart::Normal(ref s) | & StringPart::Highlighted(ref s) => s
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}
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}
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}
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impl Diagnostic {
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pub fn new(level: Level, message: &str) -> Self {
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Diagnostic::new_with_code(level, None, message)
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}
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pub fn new_with_code(level: Level, code: Option<DiagnosticId>, message: &str) -> Self {
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Diagnostic {
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level,
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message: vec![(message.to_owned(), Style::NoStyle)],
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code,
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span: MultiSpan::new(),
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children: vec![],
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suggestions: vec![],
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}
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}
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pub fn is_error(&self) -> bool {
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match self.level {
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Level::Bug |
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Level::Fatal |
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Level::Error |
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Level::FailureNote => {
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true
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}
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Level::Warning |
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Level::Note |
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Level::Help |
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Level::Cancelled => {
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false
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}
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}
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}
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/// Cancel the diagnostic (a structured diagnostic must either be emitted or
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/// canceled or it will panic when dropped).
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pub fn cancel(&mut self) {
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self.level = Level::Cancelled;
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}
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pub fn cancelled(&self) -> bool {
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self.level == Level::Cancelled
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}
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/// Adds a span/label to be included in the resulting snippet.
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/// This label will be shown together with the original span/label used when creating the
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/// diagnostic, *not* a span added by one of the `span_*` methods.
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///
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/// This is pushed onto the `MultiSpan` that was created when the
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/// diagnostic was first built. If you don't call this function at
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/// all, and you just supplied a `Span` to create the diagnostic,
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/// then the snippet will just include that `Span`, which is
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/// called the primary span.
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pub fn span_label<T: Into<String>>(&mut self, span: Span, label: T) -> &mut Self {
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self.span.push_span_label(span, label.into());
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self
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}
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pub fn replace_span_with(&mut self, after: Span) -> &mut Self {
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let before = self.span.clone();
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self.set_span(after);
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for span_label in before.span_labels() {
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if let Some(label) = span_label.label {
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self.span_label(after, label);
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}
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}
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self
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}
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pub fn note_expected_found(&mut self,
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label: &dyn fmt::Display,
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expected: DiagnosticStyledString,
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found: DiagnosticStyledString)
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-> &mut Self
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{
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self.note_expected_found_extra(label, expected, found, &"", &"")
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}
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pub fn note_expected_found_extra(&mut self,
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label: &dyn fmt::Display,
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expected: DiagnosticStyledString,
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found: DiagnosticStyledString,
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expected_extra: &dyn fmt::Display,
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found_extra: &dyn fmt::Display)
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-> &mut Self
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{
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let mut msg: Vec<_> = vec![(format!("expected {} `", label), Style::NoStyle)];
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msg.extend(expected.0.iter()
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.map(|x| match *x {
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StringPart::Normal(ref s) => (s.to_owned(), Style::NoStyle),
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StringPart::Highlighted(ref s) => (s.to_owned(), Style::Highlight),
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}));
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msg.push((format!("`{}\n", expected_extra), Style::NoStyle));
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msg.push((format!(" found {} `", label), Style::NoStyle));
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msg.extend(found.0.iter()
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.map(|x| match *x {
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StringPart::Normal(ref s) => (s.to_owned(), Style::NoStyle),
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StringPart::Highlighted(ref s) => (s.to_owned(), Style::Highlight),
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}));
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msg.push((format!("`{}", found_extra), Style::NoStyle));
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// For now, just attach these as notes
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self.highlighted_note(msg);
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self
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}
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pub fn note_trait_signature(&mut self, name: String, signature: String) -> &mut Self {
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self.highlighted_note(vec![
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(format!("`{}` from trait: `", name), Style::NoStyle),
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(signature, Style::Highlight),
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("`".to_string(), Style::NoStyle)]);
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self
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}
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pub fn note(&mut self, msg: &str) -> &mut Self {
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self.sub(Level::Note, msg, MultiSpan::new(), None);
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self
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}
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pub fn highlighted_note(&mut self, msg: Vec<(String, Style)>) -> &mut Self {
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self.sub_with_highlights(Level::Note, msg, MultiSpan::new(), None);
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self
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}
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/// Prints the span with a note above it.
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pub fn span_note<S: Into<MultiSpan>>(&mut self,
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sp: S,
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msg: &str)
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-> &mut Self {
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self.sub(Level::Note, msg, sp.into(), None);
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self
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}
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pub fn warn(&mut self, msg: &str) -> &mut Self {
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self.sub(Level::Warning, msg, MultiSpan::new(), None);
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self
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}
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/// Prints the span with a warn above it.
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pub fn span_warn<S: Into<MultiSpan>>(&mut self,
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sp: S,
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msg: &str)
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-> &mut Self {
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self.sub(Level::Warning, msg, sp.into(), None);
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self
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}
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pub fn help(&mut self , msg: &str) -> &mut Self {
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self.sub(Level::Help, msg, MultiSpan::new(), None);
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self
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}
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/// Prints the span with some help above it.
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pub fn span_help<S: Into<MultiSpan>>(&mut self,
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sp: S,
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msg: &str)
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-> &mut Self {
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self.sub(Level::Help, msg, sp.into(), None);
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self
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}
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pub fn multipart_suggestion(
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&mut self,
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msg: &str,
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suggestion: Vec<(Span, String)>,
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applicability: Applicability,
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) -> &mut Self {
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self.suggestions.push(CodeSuggestion {
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substitutions: vec![Substitution {
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parts: suggestion
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.into_iter()
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.map(|(span, snippet)| SubstitutionPart { snippet, span })
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.collect(),
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}],
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msg: msg.to_owned(),
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style: SuggestionStyle::ShowCode,
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applicability,
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});
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self
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}
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/// Prints out a message with for a multipart suggestion without showing the suggested code.
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///
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/// This is intended to be used for suggestions that are obvious in what the changes need to
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/// be from the message, showing the span label inline would be visually unpleasant
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/// (marginally overlapping spans or multiline spans) and showing the snippet window wouldn't
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/// improve understandability.
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pub fn tool_only_multipart_suggestion(
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&mut self,
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msg: &str,
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suggestion: Vec<(Span, String)>,
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applicability: Applicability,
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) -> &mut Self {
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self.suggestions.push(CodeSuggestion {
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substitutions: vec![Substitution {
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parts: suggestion
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.into_iter()
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.map(|(span, snippet)| SubstitutionPart { snippet, span })
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.collect(),
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}],
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msg: msg.to_owned(),
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style: SuggestionStyle::CompletelyHidden,
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applicability,
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});
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self
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}
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/// Prints out a message with a suggested edit of the code.
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///
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/// In case of short messages and a simple suggestion, rustc displays it as a label:
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///
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/// ```text
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/// try adding parentheses: `(tup.0).1`
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/// ```
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///
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/// The message
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///
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/// * should not end in any punctuation (a `:` is added automatically)
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/// * should not be a question (avoid language like "did you mean")
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/// * should not contain any phrases like "the following", "as shown", etc.
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/// * may look like "to do xyz, use" or "to do xyz, use abc"
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/// * may contain a name of a function, variable, or type, but not whole expressions
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///
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/// See `CodeSuggestion` for more information.
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pub fn span_suggestion(
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&mut self,
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sp: Span,
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msg: &str,
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suggestion: String,
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applicability: Applicability,
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) -> &mut Self {
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self.span_suggestion_with_style(
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sp,
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msg,
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suggestion,
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applicability,
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SuggestionStyle::ShowCode,
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);
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self
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}
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pub fn span_suggestion_with_style(
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&mut self,
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sp: Span,
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msg: &str,
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suggestion: String,
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applicability: Applicability,
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style: SuggestionStyle,
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) -> &mut Self {
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self.suggestions.push(CodeSuggestion {
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substitutions: vec![Substitution {
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parts: vec![SubstitutionPart {
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snippet: suggestion,
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span: sp,
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}],
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}],
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msg: msg.to_owned(),
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style,
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applicability,
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});
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self
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}
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pub fn span_suggestion_verbose(
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&mut self,
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sp: Span,
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msg: &str,
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suggestion: String,
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applicability: Applicability,
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) -> &mut Self {
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self.span_suggestion_with_style(
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sp,
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msg,
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suggestion,
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applicability,
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SuggestionStyle::ShowAlways,
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);
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self
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}
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/// Prints out a message with multiple suggested edits of the code.
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pub fn span_suggestions(
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&mut self,
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sp: Span,
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msg: &str,
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suggestions: impl Iterator<Item = String>,
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applicability: Applicability,
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) -> &mut Self {
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self.suggestions.push(CodeSuggestion {
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substitutions: suggestions.map(|snippet| Substitution {
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parts: vec![SubstitutionPart {
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snippet,
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span: sp,
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}],
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}).collect(),
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msg: msg.to_owned(),
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style: SuggestionStyle::ShowCode,
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applicability,
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});
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self
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}
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/// Prints out a message with a suggested edit of the code. If the suggestion is presented
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/// inline, it will only show the message and not the suggestion.
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///
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/// See `CodeSuggestion` for more information.
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pub fn span_suggestion_short(
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&mut self, sp: Span, msg: &str, suggestion: String, applicability: Applicability
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) -> &mut Self {
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self.span_suggestion_with_style(
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sp,
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msg,
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suggestion,
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applicability,
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SuggestionStyle::HideCodeInline,
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);
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self
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}
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/// Prints out a message with for a suggestion without showing the suggested code.
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///
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/// This is intended to be used for suggestions that are obvious in what the changes need to
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/// be from the message, showing the span label inline would be visually unpleasant
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/// (marginally overlapping spans or multiline spans) and showing the snippet window wouldn't
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/// improve understandability.
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pub fn span_suggestion_hidden(
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&mut self, sp: Span, msg: &str, suggestion: String, applicability: Applicability
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) -> &mut Self {
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self.span_suggestion_with_style(
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sp,
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msg,
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suggestion,
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applicability,
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SuggestionStyle::HideCodeAlways,
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);
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self
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}
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/// Adds a suggestion to the json output, but otherwise remains silent/undisplayed in the cli.
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///
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/// This is intended to be used for suggestions that are *very* obvious in what the changes
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/// need to be from the message, but we still want other tools to be able to apply them.
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pub fn tool_only_span_suggestion(
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&mut self, sp: Span, msg: &str, suggestion: String, applicability: Applicability
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) -> &mut Self {
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self.span_suggestion_with_style(
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sp,
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msg,
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suggestion,
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applicability,
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SuggestionStyle::CompletelyHidden,
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);
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self
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}
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pub fn set_span<S: Into<MultiSpan>>(&mut self, sp: S) -> &mut Self {
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self.span = sp.into();
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self
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}
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pub fn code(&mut self, s: DiagnosticId) -> &mut Self {
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self.code = Some(s);
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self
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}
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pub fn get_code(&self) -> Option<DiagnosticId> {
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self.code.clone()
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}
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pub fn message(&self) -> String {
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self.message.iter().map(|i| i.0.as_str()).collect::<String>()
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}
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pub fn styled_message(&self) -> &Vec<(String, Style)> {
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&self.message
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}
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/// Used by a lint. Copies over all details *but* the "main
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/// message".
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pub fn copy_details_not_message(&mut self, from: &Diagnostic) {
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self.span = from.span.clone();
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self.code = from.code.clone();
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self.children.extend(from.children.iter().cloned())
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}
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/// Convenience function for internal use, clients should use one of the
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/// public methods above.
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pub fn sub(&mut self,
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level: Level,
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message: &str,
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span: MultiSpan,
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render_span: Option<MultiSpan>) {
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let sub = SubDiagnostic {
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level,
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message: vec![(message.to_owned(), Style::NoStyle)],
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span,
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render_span,
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};
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self.children.push(sub);
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}
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/// Convenience function for internal use, clients should use one of the
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/// public methods above.
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fn sub_with_highlights(&mut self,
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level: Level,
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message: Vec<(String, Style)>,
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span: MultiSpan,
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render_span: Option<MultiSpan>) {
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let sub = SubDiagnostic {
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level,
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message,
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span,
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render_span,
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};
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self.children.push(sub);
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}
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}
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impl SubDiagnostic {
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pub fn message(&self) -> String {
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self.message.iter().map(|i| i.0.as_str()).collect::<String>()
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}
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pub fn styled_message(&self) -> &Vec<(String, Style)> {
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&self.message
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}
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}
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