wain_syntax_binary/
source.rs

1use std::fmt;
2use wain_ast::source::Source;
3
4pub(crate) fn describe_position(f: &mut fmt::Formatter<'_>, source: &[u8], pos: usize) -> fmt::Result {
5    if pos == source.len() {
6        write!(f, " caused at byte offset {} (end of input)", pos)
7    } else {
8        let source = &source[pos..];
9        let source = if source.len() > 25 { &source[..25] } else { source };
10        write!(f, " caused at byte offset {}\n\n ...", pos)?;
11        for b in source {
12            write!(f, " {:02x}", b)?;
13        }
14        f.write_str("\n     ^\n     starts from here")
15    }
16}
17
18#[derive(Clone)]
19pub struct BinarySource<'source>(pub(crate) &'source [u8]);
20
21impl<'s> Source for BinarySource<'s> {
22    type Raw = &'s [u8];
23
24    fn describe(&self, f: &mut fmt::Formatter<'_>, offset: usize) -> fmt::Result {
25        describe_position(f, self.0, offset)
26    }
27
28    fn raw(&self) -> Self::Raw {
29        self.0
30    }
31}
wain_syntax_binary/source.rs

wain_syntax_binary/
source.rs
