1 //! FIXME: write short doc here
10 use crate::{validation, AstNode, SourceFile, TextRange};
12 fn check_file_invariants(file: &SourceFile) {
13 let root = file.syntax();
14 validation::validate_block_structure(root);
17 pub fn check_parser(text: &str) {
18 let file = SourceFile::parse(text);
19 check_file_invariants(&file.tree());
22 #[derive(Debug, Clone)]
23 pub struct CheckReparse {
30 pub fn from_data(data: &[u8]) -> Option<Self> {
31 const PREFIX: &str = "fn main(){\n\t";
32 const SUFFIX: &str = "\n}";
34 let data = str::from_utf8(data).ok()?;
35 let mut lines = data.lines();
36 let delete_start = usize::from_str(lines.next()?).ok()? + PREFIX.len();
37 let delete_len = usize::from_str(lines.next()?).ok()?;
38 let insert = lines.next()?.to_string();
39 let text = lines.collect::<Vec<_>>().join("\n");
40 let text = format!("{}{}{}", PREFIX, text, SUFFIX);
41 text.get(delete_start..delete_start.checked_add(delete_len)?)?; // make sure delete is a valid range
43 TextRange::at(delete_start.try_into().unwrap(), delete_len.try_into().unwrap());
45 format!("{}{}{}", &text[..delete_start], &insert, &text[delete_start + delete_len..]);
46 let edit = Indel { delete, insert };
47 Some(CheckReparse { text, edit, edited_text })
51 let parse = SourceFile::parse(&self.text);
52 let new_parse = parse.reparse(&self.edit);
53 check_file_invariants(&new_parse.tree());
54 assert_eq!(&new_parse.tree().syntax().text().to_string(), &self.edited_text);
55 let full_reparse = SourceFile::parse(&self.edited_text);
57 new_parse.tree().syntax().descendants().zip(full_reparse.tree().syntax().descendants())
59 if (a.kind(), a.text_range()) != (b.kind(), b.text_range()) {
60 eprint!("original:\n{:#?}", parse.tree().syntax());
61 eprint!("reparsed:\n{:#?}", new_parse.tree().syntax());
62 eprint!("full reparse:\n{:#?}", full_reparse.tree().syntax());
66 "different syntax tree produced by the full reparse"
71 // assert_eq!(new_file.errors(), full_reparse.errors());