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|
use std::borrow::Cow;
use lib::{Report, LINTS};
use rnix::{parser::ParseError as RnixParseErr, TextRange, WalkEvent};
type Source<'a> = Cow<'a, str>;
fn collect_fixes(source: &str) -> Result<Vec<Report>, RnixParseErr> {
let parsed = rnix::parse(source).as_result()?;
Ok(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))
.filter(|report| report.total_suggestion_range().is_some())
.collect::<Vec<_>>()
}),
_ => None,
})
.flatten()
.collect())
}
fn reorder(mut reports: Vec<Report>) -> Vec<Report> {
use std::collections::VecDeque;
reports.sort_by(|a, b| {
let a_range = a.range();
let b_range = b.range();
a_range.end().partial_cmp(&b_range.end()).unwrap()
});
reports
.into_iter()
.fold(VecDeque::new(), |mut deque: VecDeque<Report>, new_elem| {
let front = deque.front();
let new_range = new_elem.range();
if let Some(front_range) = front.map(|f| f.range()) {
if new_range.start() > front_range.end() {
deque.push_front(new_elem);
}
} else {
deque.push_front(new_elem);
}
deque
})
.into()
}
#[derive(Debug)]
pub struct FixResult<'a> {
pub src: Source<'a>,
pub fixed: Vec<Fixed>,
}
#[derive(Debug, Clone)]
pub struct Fixed {
pub at: TextRange,
pub code: u32,
}
impl<'a> FixResult<'a> {
fn empty(src: Source<'a>) -> Self {
Self { src, fixed: vec![] }
}
}
fn next(mut src: Source) -> Result<FixResult, RnixParseErr> {
let all_reports = collect_fixes(&src)?;
if all_reports.is_empty() {
return Ok(FixResult::empty(src));
}
let reordered = reorder(all_reports);
let fixed = reordered
.iter()
.map(|r| Fixed {
at: r.range(),
code: r.code,
})
.collect::<Vec<_>>();
for report in reordered {
report.apply(src.to_mut());
}
Ok(FixResult {
src,
fixed
})
}
pub fn fix(src: &str) -> Result<FixResult, RnixParseErr> {
let src = Cow::from(src);
let _ = rnix::parse(&src).as_result()?;
let mut initial = FixResult::empty(src);
while let Ok(next_result) = next(initial.src) {
if next_result.fixed.is_empty() {
return Ok(next_result);
} else {
initial = FixResult::empty(next_result.src);
}
}
unreachable!("a fix caused a syntax error, please report a bug");
}
|
