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use std::{borrow::Cow, convert::TryFrom};
use lib::{session::SessionInfo, Report};
use rnix::{TextSize, WalkEvent};
use crate::{err::SingleFixErr, fix::Source, utils};
pub struct SingleFixResult<'δ> {
pub src: Source<'δ>,
}
fn pos_to_byte(line: usize, col: usize, src: &str) -> Result<TextSize, SingleFixErr> {
let mut byte: TextSize = TextSize::of("");
for (l, _) in src
.split_inclusive('\n')
.zip(1..)
.take_while(|(_, i)| *i < line)
{
byte += TextSize::of(l);
}
byte += TextSize::try_from(col).map_err(|_| SingleFixErr::Conversion(col))?;
if usize::from(byte) >= src.len() {
Err(SingleFixErr::OutOfBounds(line, col))
} else {
Ok(byte)
}
}
fn find(offset: TextSize, src: &str, sess: &SessionInfo) -> Result<Report, SingleFixErr> {
// we don't really need the source to form a completely parsed tree
let parsed = rnix::parse(src);
let lints = utils::lint_map();
parsed
.node()
.preorder_with_tokens()
.filter_map(|event| match event {
WalkEvent::Enter(child) => lints.get(&child.kind()).map(|rules| {
rules
.iter()
.filter_map(|rule| rule.validate(&child, sess))
.find(|report| report.total_suggestion_range().is_some())
}),
_ => None,
})
.flatten()
.find(|report| report.total_diagnostic_range().unwrap().contains(offset))
.ok_or(SingleFixErr::NoOp)
}
pub fn single<'a, 'b>(
line: usize,
col: usize,
src: &'a str,
sess: &'b SessionInfo,
) -> Result<SingleFixResult<'a>, SingleFixErr> {
let mut src = Cow::from(src);
let offset = pos_to_byte(line, col, &*src)?;
let report = find(offset, &*src, &sess)?;
report.apply(src.to_mut());
Ok(SingleFixResult { src })
}
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