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|
use annotate_snippets::{
display_list::DisplayList,
formatter::DisplayListFormatter,
snippet::{Annotation, AnnotationType, Slice, Snippet, SourceAnnotation},
};
use crate::syntax::{ParsedSpan, Span};
#[derive(Debug, Clone, Default)]
pub(crate) struct ErrorBuilder {
title: FreeAnnotation,
annotations: Vec<SpannedAnnotation>,
footer: Vec<FreeAnnotation>,
/// Inducate that the current builder has already been consumed and consuming it again should
/// panic.
consumed: bool,
}
#[derive(Debug, Clone)]
struct SpannedAnnotation {
span: ParsedSpan,
message: String,
annotation_type: AnnotationType,
}
#[derive(Debug, Clone)]
struct FreeAnnotation {
message: String,
annotation_type: AnnotationType,
}
impl SpannedAnnotation {
fn into_annotation(self) -> SourceAnnotation {
SourceAnnotation {
label: self.message,
annotation_type: self.annotation_type,
range: self.span.as_char_range(),
}
}
}
impl FreeAnnotation {
fn into_annotation(self) -> Annotation {
Annotation {
label: Some(self.message),
id: None,
annotation_type: self.annotation_type,
}
}
}
/// A builder that uses the annotate_snippets library to display nice error messages about source
/// code locations.
impl ErrorBuilder {
pub fn new(message: impl ToString) -> Self {
ErrorBuilder {
title: FreeAnnotation {
message: message.to_string(),
annotation_type: AnnotationType::Error,
},
annotations: Vec::new(),
footer: Vec::new(),
consumed: false,
}
}
pub fn span_annot(
&mut self,
span: Span,
message: impl ToString,
annotation_type: AnnotationType,
) -> &mut Self {
// Ignore spans not coming from a source file
let span = match span {
Span::Parsed(span) => span,
_ => return self,
};
self.annotations.push(SpannedAnnotation {
span,
message: message.to_string(),
annotation_type,
});
self
}
pub fn footer_annot(
&mut self,
message: impl ToString,
annotation_type: AnnotationType,
) -> &mut Self {
self.footer.push(FreeAnnotation {
message: message.to_string(),
annotation_type,
});
self
}
pub fn span_err(
&mut self,
span: Span,
message: impl ToString,
) -> &mut Self {
self.span_annot(span, message, AnnotationType::Error)
}
pub fn span_help(
&mut self,
span: Span,
message: impl ToString,
) -> &mut Self {
self.span_annot(span, message, AnnotationType::Help)
}
pub fn help(&mut self, message: impl ToString) -> &mut Self {
self.footer_annot(message, AnnotationType::Help)
}
pub fn note(&mut self, message: impl ToString) -> &mut Self {
self.footer_annot(message, AnnotationType::Note)
}
// TODO: handle multiple files
#[allow(clippy::drop_ref)]
pub fn format(&mut self) -> String {
if self.consumed {
panic!("tried to format the same ErrorBuilder twice")
}
let this = std::mem::take(self);
self.consumed = true;
drop(self); // Get rid of the self reference so we don't use it by mistake.
let slices = if this.annotations.is_empty() {
Vec::new()
} else {
let input = this.annotations[0].span.to_input();
let annotations = this
.annotations
.into_iter()
.map(|annot| annot.into_annotation())
.collect();
vec![Slice {
source: input,
line_start: 1, // TODO
origin: Some("<current file>".to_string()),
fold: true,
annotations,
}]
};
let footer = this
.footer
.into_iter()
.map(|annot| annot.into_annotation())
.collect();
let snippet = Snippet {
title: Some(this.title.into_annotation()),
slices,
footer,
};
let dl = DisplayList::from(snippet);
let dlf = DisplayListFormatter::new(true, false);
dlf.format(&dl)
}
}
impl Default for FreeAnnotation {
fn default() -> Self {
FreeAnnotation {
message: String::new(),
annotation_type: AnnotationType::Error,
}
}
}
|
