118 lines
3.9 KiB
Rust
118 lines
3.9 KiB
Rust
// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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use Span;
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use rustc_errors as errors;
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use syntax_pos::MultiSpan;
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/// An enum representing a diagnostic level.
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#[unstable(feature = "proc_macro_diagnostic", issue = "38356")]
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#[derive(Copy, Clone, Debug)]
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#[non_exhaustive]
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pub enum Level {
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/// An error.
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Error,
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/// A warning.
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Warning,
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/// A note.
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Note,
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/// A help message.
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Help,
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}
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/// A structure representing a diagnostic message and associated children
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/// messages.
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#[unstable(feature = "proc_macro_diagnostic", issue = "38356")]
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#[derive(Clone, Debug)]
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pub struct Diagnostic {
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level: Level,
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message: String,
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span: Option<Span>,
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children: Vec<Diagnostic>
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}
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macro_rules! diagnostic_child_methods {
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($spanned:ident, $regular:ident, $level:expr) => (
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/// Add a new child diagnostic message to `self` with the level
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/// identified by this methods name with the given `span` and `message`.
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#[unstable(feature = "proc_macro_diagnostic", issue = "38356")]
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pub fn $spanned<T: Into<String>>(mut self, span: Span, message: T) -> Diagnostic {
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self.children.push(Diagnostic::spanned(span, $level, message));
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self
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}
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/// Add a new child diagnostic message to `self` with the level
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/// identified by this method's name with the given `message`.
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#[unstable(feature = "proc_macro_diagnostic", issue = "38356")]
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pub fn $regular<T: Into<String>>(mut self, message: T) -> Diagnostic {
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self.children.push(Diagnostic::new($level, message));
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self
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}
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)
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}
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impl Diagnostic {
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/// Create a new diagnostic with the given `level` and `message`.
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#[unstable(feature = "proc_macro_diagnostic", issue = "38356")]
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pub fn new<T: Into<String>>(level: Level, message: T) -> Diagnostic {
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Diagnostic {
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level: level,
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message: message.into(),
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span: None,
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children: vec![]
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}
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}
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/// Create a new diagnostic with the given `level` and `message` pointing to
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/// the given `span`.
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#[unstable(feature = "proc_macro_diagnostic", issue = "38356")]
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pub fn spanned<T: Into<String>>(span: Span, level: Level, message: T) -> Diagnostic {
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Diagnostic {
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level: level,
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message: message.into(),
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span: Some(span),
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children: vec![]
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}
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}
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diagnostic_child_methods!(span_error, error, Level::Error);
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diagnostic_child_methods!(span_warning, warning, Level::Warning);
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diagnostic_child_methods!(span_note, note, Level::Note);
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diagnostic_child_methods!(span_help, help, Level::Help);
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/// Returns the diagnostic `level` for `self`.
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#[unstable(feature = "proc_macro_diagnostic", issue = "38356")]
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pub fn level(&self) -> Level {
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self.level
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}
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/// Emit the diagnostic.
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#[unstable(feature = "proc_macro_diagnostic", issue = "38356")]
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pub fn emit(self) {
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let level = self.level.to_internal();
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let mut diag = errors::Diagnostic::new(level, &*self.message);
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if let Some(span) = self.span {
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diag.set_span(span.0);
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}
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for child in self.children {
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let span = child.span.map_or(MultiSpan::new(), |s| s.0.into());
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let level = child.level.to_internal();
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diag.sub(level, &*child.message, span, None);
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}
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::__internal::with_sess(move |sess, _| {
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errors::DiagnosticBuilder::new_diagnostic(&sess.span_diagnostic, diag).emit();
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});
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}
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}
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