diagnostic.rs.html -- source
Description: Source to the Rust file `src/libproc_macro/diagnostic.rs`.
Keywords: rust, rustlang, rust-lang

      1
      2
      3
      4
      5
      6
      7
      8
      9
     10
     11
     12
     13
     14
     15
     16
     17
     18
     19
     20
     21
     22
     23
     24
     25
     26
     27
     28
     29
     30
     31
     32
     33
     34
     35
     36
     37
     38
     39
     40
     41
     42
     43
     44
     45
     46
     47
     48
     49
     50
     51
     52
     53
     54
     55
     56
     57
     58
     59
     60
     61
     62
     63
     64
     65
     66
     67
     68
     69
     70
     71
     72
     73
     74
     75
     76
     77
     78
     79
     80
     81
     82
     83
     84
     85
     86
     87
     88
     89
     90
     91
     92
     93
     94
     95
     96
     97
     98
     99
    100
    101
    102
    103
    104
    105
    106
    107
    108
    109
    110
    111
    112
    113
    114
    115
    116
    117
    118
    119
    120
    121
    122
    123
    124
    125
    126
    127
    128
    129
    130
    131
    132
    133
    134
    135
    136
    137
    138
    139
    140
    141
    142
    143
    144
    145
    146
    147
    148
    149
    150
    151
    152
    153
    154
    155
    156
    157
    158
    159
    160
    161
    162
    163
    164
    165
    166
    167
    168
    169
    170
    171
    172
    173
    174
    175
    176
    177
    178
    179
    180
    181
    182
    183
    184
    185
    186
    187
    188
    189

    use crate::Span;

    /// An enum representing a diagnostic level.
    #[unstable(feature = "proc_macro_diagnostic", issue = "54140")]
    #[derive(Copy, Clone, Debug)]
    #[non_exhaustive]
    pub enum Level {
        /// An error.
        Error,
        /// A warning.
        Warning,
        /// A note.
        Note,
        /// A help message.
        Help,
    }

    /// Trait implemented by types that can be converted into a set of `Span`s.
    #[unstable(feature = "proc_macro_diagnostic", issue = "54140")]
    pub trait MultiSpan {
        /// Converts `self` into a `Vec<Span>`.
        fn into_spans(self) -> Vec<Span>;
    }

    #[unstable(feature = "proc_macro_diagnostic", issue = "54140")]
    impl MultiSpan for Span {
        fn into_spans(self) -> Vec<Span> {
            vec![self]
        }
    }

    #[unstable(feature = "proc_macro_diagnostic", issue = "54140")]
    impl MultiSpan for Vec<Span> {
        fn into_spans(self) -> Vec<Span> {
            self
        }
    }

    #[unstable(feature = "proc_macro_diagnostic", issue = "54140")]
    impl<'a> MultiSpan for &'a [Span] {
        fn into_spans(self) -> Vec<Span> {
            self.to_vec()
        }
    }

    /// A structure representing a diagnostic message and associated children
    /// messages.
    #[unstable(feature = "proc_macro_diagnostic", issue = "54140")]
    #[derive(Clone, Debug)]
    pub struct Diagnostic {
        level: Level,
        message: String,
        spans: Vec<Span>,
        children: Vec<Diagnostic>
    }

    macro_rules! diagnostic_child_methods {
        ($spanned:ident, $regular:ident, $level:expr) => (
            /// Adds a new child diagnostic message to `self` with the level
            /// identified by this method's name with the given `spans` and
            /// `message`.
            #[unstable(feature = "proc_macro_diagnostic", issue = "54140")]
            pub fn $spanned<S, T>(mut self, spans: S, message: T) -> Diagnostic
                where S: MultiSpan, T: Into<String>
            {
                self.children.push(Diagnostic::spanned(spans, $level, message));
                self
            }

            /// Adds a new child diagnostic message to `self` with the level
            /// identified by this method's name with the given `message`.
            #[unstable(feature = "proc_macro_diagnostic", issue = "54140")]
            pub fn $regular<T: Into<String>>(mut self, message: T) -> Diagnostic {
                self.children.push(Diagnostic::new($level, message));
                self
            }
        )
    }

    /// Iterator over the children diagnostics of a `Diagnostic`.
    #[derive(Debug, Clone)]
    #[unstable(feature = "proc_macro_diagnostic", issue = "54140")]
    pub struct Children<'a>(std::slice::Iter<'a, Diagnostic>);

    #[unstable(feature = "proc_macro_diagnostic", issue = "54140")]
    impl<'a> Iterator for Children<'a> {
        type Item = &'a Diagnostic;

        fn next(&mut self) -> Option<Self::Item> {
            self.0.next()
        }
    }

    #[unstable(feature = "proc_macro_diagnostic", issue = "54140")]
    impl Diagnostic {
        /// Creates a new diagnostic with the given `level` and `message`.
        #[unstable(feature = "proc_macro_diagnostic", issue = "54140")]
        pub fn new<T: Into<String>>(level: Level, message: T) -> Diagnostic {
            Diagnostic {
                level: level,
                message: message.into(),
                spans: vec![],
                children: vec![]
            }
        }

        /// Creates a new diagnostic with the given `level` and `message` pointing to
        /// the given set of `spans`.
        #[unstable(feature = "proc_macro_diagnostic", issue = "54140")]
        pub fn spanned<S, T>(spans: S, level: Level, message: T) -> Diagnostic
            where S: MultiSpan, T: Into<String>
        {
            Diagnostic {
                level: level,
                message: message.into(),
                spans: spans.into_spans(),
                children: vec![]
            }
        }

        diagnostic_child_methods!(span_error, error, Level::Error);
        diagnostic_child_methods!(span_warning, warning, Level::Warning);
        diagnostic_child_methods!(span_note, note, Level::Note);
        diagnostic_child_methods!(span_help, help, Level::Help);

        /// Returns the diagnostic `level` for `self`.
        #[unstable(feature = "proc_macro_diagnostic", issue = "54140")]
        pub fn level(&self) -> Level {
            self.level
        }

        /// Sets the level in `self` to `level`.
        #[unstable(feature = "proc_macro_diagnostic", issue = "54140")]
        pub fn set_level(&mut self, level: Level) {
            self.level = level;
        }

        /// Returns the message in `self`.
        #[unstable(feature = "proc_macro_diagnostic", issue = "54140")]
        pub fn message(&self) -> &str {
            &self.message
        }

        /// Sets the message in `self` to `message`.
        #[unstable(feature = "proc_macro_diagnostic", issue = "54140")]
        pub fn set_message<T: Into<String>>(&mut self, message: T) {
            self.message = message.into();
        }

        /// Returns the `Span`s in `self`.
        #[unstable(feature = "proc_macro_diagnostic", issue = "54140")]
        pub fn spans(&self) -> &[Span] {
            &self.spans
        }

        /// Sets the `Span`s in `self` to `spans`.
        #[unstable(feature = "proc_macro_diagnostic", issue = "54140")]
        pub fn set_spans<S: MultiSpan>(&mut self, spans: S) {
            self.spans = spans.into_spans();
        }

        /// Returns an iterator over the children diagnostics of `self`.
        #[unstable(feature = "proc_macro_diagnostic", issue = "54140")]
        pub fn children(&self) -> Children<'_> {
            Children(self.children.iter())
        }

        /// Emit the diagnostic.
        #[unstable(feature = "proc_macro_diagnostic", issue = "54140")]
        pub fn emit(self) {
            fn to_internal(spans: Vec<Span>) -> crate::bridge::client::MultiSpan {
                let mut multi_span = crate::bridge::client::MultiSpan::new();
                for span in spans {
                    multi_span.push(span.0);
                }
                multi_span
            }

            let mut diag = crate::bridge::client::Diagnostic::new(
                self.level,
                &self.message[..],
                to_internal(self.spans),
            );
            for c in self.children {
                diag.sub(c.level, &c.message[..], to_internal(c.spans));
            }
            diag.emit();
        }
    }