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|
use crate::gen::fs;
use crate::syntax;
use codespan_reporting::diagnostic::{Diagnostic, Label};
use codespan_reporting::files::SimpleFiles;
use codespan_reporting::term::termcolor::{ColorChoice, StandardStream, WriteColor};
use codespan_reporting::term::{self, Config};
use std::borrow::Cow;
use std::error::Error as StdError;
use std::fmt::{self, Display};
use std::io::{self, Write};
use std::ops::Range;
use std::path::{Path, PathBuf};
use std::process;
use std::str::Utf8Error;
pub(crate) type Result<T, E = Error> = std::result::Result<T, E>;
#[derive(Debug)]
pub(crate) enum Error {
NoBridgeMod,
Fs(fs::Error),
Utf8(PathBuf, Utf8Error),
Syn(syn::Error),
}
impl Display for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self {
Error::NoBridgeMod => write!(f, "no #[cxx::bridge] module found"),
Error::Fs(err) => err.fmt(f),
Error::Utf8(path, _) => write!(f, "Failed to read file `{}`", path.display()),
Error::Syn(err) => err.fmt(f),
}
}
}
impl StdError for Error {
fn source(&self) -> Option<&(dyn StdError + 'static)> {
match self {
Error::Fs(err) => err.source(),
Error::Utf8(_, err) => Some(err),
Error::Syn(err) => err.source(),
Error::NoBridgeMod => None,
}
}
}
impl From<fs::Error> for Error {
fn from(err: fs::Error) -> Self {
Error::Fs(err)
}
}
impl From<syn::Error> for Error {
fn from(err: syn::Error) -> Self {
Error::Syn(err)
}
}
pub(super) fn format_err(path: &Path, source: &str, error: Error) -> ! {
match error {
Error::Syn(syn_error) => {
let syn_error = sort_syn_errors(syn_error);
let writer = StandardStream::stderr(ColorChoice::Auto);
let ref mut stderr = writer.lock();
for error in syn_error {
let _ = writeln!(stderr);
display_syn_error(stderr, path, source, error);
}
}
Error::NoBridgeMod => {
let _ = writeln!(
io::stderr(),
"cxxbridge: no #[cxx::bridge] module found in {}",
path.display(),
);
}
_ => {
let _ = writeln!(io::stderr(), "cxxbridge: {}", report(error));
}
}
process::exit(1);
}
pub(crate) fn report(error: impl StdError) -> impl Display {
struct Report<E>(E);
impl<E: StdError> Display for Report<E> {
fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
write!(formatter, "{}", self.0)?;
let mut error: &dyn StdError = &self.0;
while let Some(cause) = error.source() {
write!(formatter, "\n\nCaused by:\n {}", cause)?;
error = cause;
}
Ok(())
}
}
Report(error)
}
fn sort_syn_errors(error: syn::Error) -> Vec<syn::Error> {
let mut errors: Vec<_> = error.into_iter().collect();
errors.sort_by_key(|e| {
let start = e.span().start();
(start.line, start.column)
});
errors
}
fn display_syn_error(stderr: &mut dyn WriteColor, path: &Path, source: &str, error: syn::Error) {
let span = error.span();
let start = span.start();
let end = span.end();
let mut start_offset = 0;
for _ in 1..start.line {
start_offset += source[start_offset..].find('\n').unwrap() + 1;
}
let start_column = source[start_offset..]
.chars()
.take(start.column)
.map(char::len_utf8)
.sum::<usize>();
start_offset += start_column;
let mut end_offset = start_offset;
if start.line == end.line {
end_offset -= start_column;
} else {
for _ in 0..end.line - start.line {
end_offset += source[end_offset..].find('\n').unwrap() + 1;
}
}
end_offset += source[end_offset..]
.chars()
.take(end.column)
.map(char::len_utf8)
.sum::<usize>();
let mut path = path.to_string_lossy();
if path == "-" {
path = Cow::Borrowed(if cfg!(unix) { "/dev/stdin" } else { "stdin" });
}
let mut files = SimpleFiles::new();
let file = files.add(path, source);
let diagnostic = diagnose(file, start_offset..end_offset, error);
let config = Config::default();
let _ = term::emit(stderr, &config, &files, &diagnostic);
}
fn diagnose(file: usize, range: Range<usize>, error: syn::Error) -> Diagnostic<usize> {
let message = error.to_string();
let info = syntax::error::ERRORS
.iter()
.find(|e| message.contains(e.msg));
let mut diagnostic = Diagnostic::error().with_message(&message);
let mut label = Label::primary(file, range);
if let Some(info) = info {
label.message = info.label.map_or(message, str::to_owned);
diagnostic.labels.push(label);
diagnostic.notes.extend(info.note.map(str::to_owned));
} else {
label.message = message;
diagnostic.labels.push(label);
}
diagnostic.code = Some("cxxbridge".to_owned());
diagnostic
}
|
