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//! lib-proc-macro diagnostic
//!
//! Copy from https://github.com/rust-lang/rust/blob/6050e523bae6de61de4e060facc43dc512adaccd/src/libproc_macro/diagnostic.rs
//! augmented with removing unstable features
use crate::proc_macro::Span;
/// An enum representing a diagnostic level.
#[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.
pub trait MultiSpan {
/// Converts `self` into a `Vec<Span>`.
fn into_spans(self) -> Vec<Span>;
}
impl MultiSpan for Span {
fn into_spans(self) -> Vec<Span> {
vec![self]
}
}
impl MultiSpan for Vec<Span> {
fn into_spans(self) -> Vec<Span> {
self
}
}
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.
#[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`.
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`.
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)]
pub struct Children<'a>(std::slice::Iter<'a, Diagnostic>);
impl<'a> Iterator for Children<'a> {
type Item = &'a Diagnostic;
fn next(&mut self) -> Option<Self::Item> {
self.0.next()
}
}
impl Diagnostic {
/// Creates a new diagnostic with the given `level` and `message`.
pub fn new<T: Into<String>>(level: Level, message: T) -> Diagnostic {
Diagnostic { 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`.
pub fn spanned<S, T>(spans: S, level: Level, message: T) -> Diagnostic
where
S: MultiSpan,
T: Into<String>,
{
Diagnostic { 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`.
pub fn level(&self) -> Level {
self.level
}
/// Sets the level in `self` to `level`.
pub fn set_level(&mut self, level: Level) {
self.level = level;
}
/// Returns the message in `self`.
pub fn message(&self) -> &str {
&self.message
}
/// Sets the message in `self` to `message`.
pub fn set_message<T: Into<String>>(&mut self, message: T) {
self.message = message.into();
}
/// Returns the `Span`s in `self`.
pub fn spans(&self) -> &[Span] {
&self.spans
}
/// Sets the `Span`s in `self` to `spans`.
pub fn set_spans<S: MultiSpan>(&mut self, spans: S) {
self.spans = spans.into_spans();
}
/// Returns an iterator over the children diagnostics of `self`.
pub fn children(&self) -> Children<'_> {
Children(self.children.iter())
}
/// Emit the diagnostic.
pub fn emit(self) {
fn to_internal(spans: Vec<Span>) -> crate::proc_macro::bridge::client::MultiSpan {
let mut multi_span = crate::proc_macro::bridge::client::MultiSpan::new();
for span in spans {
multi_span.push(span.0);
}
multi_span
}
let mut diag = crate::proc_macro::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();
}
}
|
