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// Taken from https://github.com/rustwasm/wasm-bindgen/blob/master/crates/backend/src/error.rs
//
// Copyright (c) 2014 Alex Crichton
//
// Permission is hereby granted, free of charge, to any
// person obtaining a copy of this software and associated
// documentation files (the "Software"), to deal in the
// Software without restriction, including without
// limitation the rights to use, copy, modify, merge,
// publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software
// is furnished to do so, subject to the following
// conditions:
//
// The above copyright notice and this permission notice
// shall be included in all copies or substantial portions
// of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
// ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
// TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
// PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
// SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
// IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
#![allow(dead_code)]
use proc_macro2::*;
use quote::{ToTokens, TokenStreamExt};
use syn::parse::Error;
macro_rules! err_span {
($span:expr, $($msg:tt)*) => (
syn::Error::new_spanned(&$span, format_args!($($msg)*))
)
}
macro_rules! bail_span {
($($t:tt)*) => (
return Err(err_span!($($t)*).into())
)
}
// macro_rules! push_err_span {
// ($diagnostics:expr, $($t:tt)*) => {
// $diagnostics.push(err_span!($($t)*))
// };
// }
// macro_rules! push_diag_result {
// ($diags:expr, $x:expr $(,)?) => {
// if let Err(e) = $x {
// $diags.push(e);
// }
// };
// }
#[derive(Debug)]
pub struct Diagnostic {
inner: Repr,
}
#[derive(Debug)]
enum Repr {
Single {
text: String,
span: Option<(Span, Span)>,
},
SynError(Error),
Multi {
diagnostics: Vec<Diagnostic>,
},
}
impl Diagnostic {
pub fn error<T: Into<String>>(text: T) -> Diagnostic {
Diagnostic {
inner: Repr::Single {
text: text.into(),
span: None,
},
}
}
pub(crate) fn spans_error<T: Into<String>>(spans: (Span, Span), text: T) -> Diagnostic {
Diagnostic {
inner: Repr::Single {
text: text.into(),
span: Some(spans),
},
}
}
pub fn from_vec(diagnostics: Vec<Diagnostic>) -> Result<(), Diagnostic> {
if diagnostics.is_empty() {
Ok(())
} else {
Err(Diagnostic {
inner: Repr::Multi { diagnostics },
})
}
}
pub fn panic(&self) -> ! {
match &self.inner {
Repr::Single { text, .. } => panic!("{}", text),
Repr::SynError(error) => panic!("{}", error),
Repr::Multi { diagnostics } => diagnostics[0].panic(),
}
}
}
impl From<Error> for Diagnostic {
fn from(err: Error) -> Diagnostic {
Diagnostic {
inner: Repr::SynError(err),
}
}
}
pub fn extract_spans(node: &dyn ToTokens) -> Option<(Span, Span)> {
let mut t = TokenStream::new();
node.to_tokens(&mut t);
let mut tokens = t.into_iter();
let start = tokens.next().map(|t| t.span());
let end = tokens.last().map(|t| t.span());
start.map(|start| (start, end.unwrap_or(start)))
}
impl ToTokens for Diagnostic {
fn to_tokens(&self, dst: &mut TokenStream) {
match &self.inner {
Repr::Single { text, span } => {
let cs2 = (Span::call_site(), Span::call_site());
let (start, end) = span.unwrap_or(cs2);
dst.append(Ident::new("compile_error", start));
dst.append(Punct::new('!', Spacing::Alone));
let mut message = TokenStream::new();
message.append(Literal::string(text));
let mut group = Group::new(Delimiter::Brace, message);
group.set_span(end);
dst.append(group);
}
Repr::Multi { diagnostics } => {
for diagnostic in diagnostics {
diagnostic.to_tokens(dst);
}
}
Repr::SynError(err) => {
err.to_compile_error().to_tokens(dst);
}
}
}
}