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use Span;
use rustc_errors as errors;
use syntax_pos::MultiSpan;
#[unstable(feature = "proc_macro_diagnostic", issue = "38356")]
#[derive(Copy, Clone, Debug)]
pub enum Level {
Error,
Warning,
Note,
Help,
#[doc(hidden)]
__Nonexhaustive,
}
#[unstable(feature = "proc_macro_diagnostic", issue = "38356")]
#[derive(Clone, Debug)]
pub struct Diagnostic {
level: Level,
message: String,
span: Option<Span>,
children: Vec<Diagnostic>
}
macro_rules! diagnostic_child_methods {
($spanned:ident, $regular:ident, $level:expr) => (
#[unstable(feature = "proc_macro_diagnostic", issue = "38356")]
pub fn $spanned<T: Into<String>>(mut self, span: Span, message: T) -> Diagnostic {
self.children.push(Diagnostic::spanned(span, $level, message));
self
}
#[unstable(feature = "proc_macro_diagnostic", issue = "38356")]
pub fn $regular<T: Into<String>>(mut self, message: T) -> Diagnostic {
self.children.push(Diagnostic::new($level, message));
self
}
)
}
impl Diagnostic {
#[unstable(feature = "proc_macro_diagnostic", issue = "38356")]
pub fn new<T: Into<String>>(level: Level, message: T) -> Diagnostic {
Diagnostic {
level: level,
message: message.into(),
span: None,
children: vec![]
}
}
#[unstable(feature = "proc_macro_diagnostic", issue = "38356")]
pub fn spanned<T: Into<String>>(span: Span, level: Level, message: T) -> Diagnostic {
Diagnostic {
level: level,
message: message.into(),
span: Some(span),
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);
#[unstable(feature = "proc_macro_diagnostic", issue = "38356")]
pub fn level(&self) -> Level {
self.level
}
#[unstable(feature = "proc_macro_diagnostic", issue = "38356")]
pub fn emit(self) {
let level = self.level.to_internal();
let mut diag = errors::Diagnostic::new(level, &*self.message);
if let Some(span) = self.span {
diag.set_span(span.0);
}
for child in self.children {
let span = child.span.map_or(MultiSpan::new(), |s| s.0.into());
let level = child.level.to_internal();
diag.sub(level, &*child.message, span, None);
}
::__internal::with_sess(move |sess, _| {
errors::DiagnosticBuilder::new_diagnostic(&sess.span_diagnostic, diag).emit();
});
}
}