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use std::{borrow::Cow, cmp::Ordering, fmt::Display};
pub enum SourceContextLine<'a> {
Context {
line: usize,
outside: Cow<'a, str>,
},
Start {
line: usize,
before: Cow<'a, str>,
inside: Cow<'a, str>,
},
End {
line: usize,
inside: Cow<'a, str>,
after: Cow<'a, str>,
},
StartAndEnd {
line: usize,
before: Cow<'a, str>,
inside: Cow<'a, str>,
after: Cow<'a, str>,
},
Inside {
line: usize,
inside: Cow<'a, str>,
},
}
impl Display for SourceContextLine<'_> {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self {
SourceContextLine::Context { line, outside } => {
writeln!(f, "{line:>6} | {outside}")
}
SourceContextLine::Start {
line,
before,
inside,
} => {
writeln!(
f,
" | {}v{}",
" ".repeat(before.len()),
"-".repeat(inside.len()),
)?;
writeln!(f, "{line:>6} + {before}{inside}")
}
SourceContextLine::End {
line,
inside,
after,
} => {
writeln!(f, "{line:>6} + {inside}{after}")?;
writeln!(f, " +{}^", "-".repeat(inside.len()))
}
SourceContextLine::StartAndEnd {
line,
before,
inside,
after,
} => {
if inside.len() >= 2 {
writeln!(
f,
" | {}v{}v",
" ".repeat(before.len()),
"-".repeat(inside.len() - 2)
)?;
} else {
writeln!(f, " | {}v", " ".repeat(before.len()))?;
}
writeln!(f, "{line:>6} + {before}{inside}{after}")?;
if inside.len() >= 2 {
writeln!(
f,
" | {}^{}^",
" ".repeat(before.len()),
"-".repeat(inside.len() - 2),
)
} else {
writeln!(f, " | {}^", " ".repeat(before.len()))
}
}
SourceContextLine::Inside { line, inside } => {
writeln!(f, "{line:>6} + {inside}")
}
}
}
}
pub struct SourceContextLines<'a>(pub Vec<SourceContextLine<'a>>);
impl Display for SourceContextLines<'_> {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
for line in &self.0 {
write!(f, "{line}")?;
}
Ok(())
}
}
/// Compute the source context for a given range of lines, including selected
/// ranges in these lines. (Lines are 0-indexed)
pub fn get_source_context<'a>(
lines: impl Iterator<Item = &'a str>,
start_line: u32,
start_column: u32,
end_line: u32,
end_column: u32,
) -> SourceContextLines<'a> {
let mut result = Vec::new();
let context_start = (start_line.saturating_sub(4)) as usize;
let context_end = (end_line + 4) as usize;
for (i, l) in lines.enumerate().take(context_end + 1).skip(context_start) {
let n = i + 1;
let i = i as u32;
fn safe_split_at(s: &str, i: u32) -> (&str, &str) {
let i = i as usize;
if i < s.len() {
s.split_at(s.floor_char_boundary(i))
} else {
(s, "")
}
}
fn limit_len(s: &str) -> Cow<'_, str> {
if s.len() < 200 {
return Cow::Borrowed(s);
}
let (a, b) = s.split_at(s.floor_char_boundary(98));
let (_, c) = b.split_at(b.ceil_char_boundary(b.len() - 99));
Cow::Owned(format!("{a}...{c}"))
}
match (i.cmp(&start_line), i.cmp(&end_line)) {
// outside
(Ordering::Less, _) | (_, Ordering::Greater) => {
result.push(SourceContextLine::Context {
line: n,
outside: limit_len(l),
});
}
// start line
(Ordering::Equal, Ordering::Less) => {
let (before, inside) = safe_split_at(l, start_column);
let before = limit_len(before);
let inside = limit_len(inside);
result.push(SourceContextLine::Start {
line: n,
before,
inside,
});
}
// start and end line
(Ordering::Equal, Ordering::Equal) => {
let real_start = l.floor_char_boundary(start_column as usize) as u32;
let (before, temp) = safe_split_at(l, real_start);
let (inside, after) = safe_split_at(temp, end_column - real_start);
let before = limit_len(before);
let inside = limit_len(inside);
let after = limit_len(after);
result.push(SourceContextLine::StartAndEnd {
line: n,
before,
inside,
after,
});
}
// end line
(Ordering::Greater, Ordering::Equal) => {
let (inside, after) = safe_split_at(l, end_column);
let inside = limit_len(inside);
let after = limit_len(after);
result.push(SourceContextLine::End {
line: n,
inside,
after,
});
}
// middle line
(Ordering::Greater, Ordering::Less) => {
result.push(SourceContextLine::Inside {
line: n,
inside: limit_len(l),
});
}
}
}
SourceContextLines(result)
}
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