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Use template text to improve reparse fuzzing

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This commit is contained in:
pcpthm
2019-03-22 04:11:21 +09:00
parent ec59d9bda5
commit c60ec02d75
1 changed files with 5 additions and 1 deletions
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6
crates/ra_syntax/src/fuzz.rs
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@@ -22,12 +22,16 @@ pub struct CheckReparse {
impl CheckReparse {
pub fn from_data(data: &[u8]) -> Option<Self> {
const PREFIX: &'static str = "fn main(){\n\t";
const SUFFIX: &'static str = "\n}";
let data = str::from_utf8(data).ok()?;
let mut lines = data.lines();
let delete_start = usize::from_str(lines.next()?).ok()?;
let delete_start = usize::from_str(lines.next()?).ok()? + PREFIX.len();
let delete_len = usize::from_str(lines.next()?).ok()?;
let insert = lines.next()?.to_string();
let text = lines.collect::<Vec<_>>().join("\n");
let text = format!("{}{}{}", PREFIX, text, SUFFIX);
text.get(delete_start..delete_start.checked_add(delete_len)?)?; // make sure delete is a valid range
let delete = TextRange::offset_len(
TextUnit::from_usize(delete_start),