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// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use Span;
use rustc_errors as errors;
use syntax_pos::MultiSpan;
/// An enum representing a diagnostic level.
#[unstable(feature = "proc_macro_diagnostic", issue = "38356")]
#[derive(Copy, Clone, Debug)]
pub enum Level {
/// An error.
Error,
/// A warning.
Warning,
/// A note.
Note,
/// A help message.
Help,
#[doc(hidden)]
__Nonexhaustive,
}
/// A structure representing a diagnostic message and associated children
/// messages.
#[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) => (
/// Add a new child diagnostic message to `self` with the level
/// identified by this methods name with the given `span` and `message`.
#[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
}
/// Add 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 = "38356")]
pub fn $regular<T: Into<String>>(mut self, message: T) -> Diagnostic {
self.children.push(Diagnostic::new($level, message));
self
}
)
}
impl Diagnostic {
/// Create a new diagnostic with the given `level` and `message`.
#[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![]
}
}
/// Create a new diagnostic with the given `level` and `message` pointing to
/// the given `span`.
#[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);
/// Returns the diagnostic `level` for `self`.
#[unstable(feature = "proc_macro_diagnostic", issue = "38356")]
pub fn level(&self) -> Level {
self.level
}
/// Emit the diagnostic.
#[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();
});
}
}
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