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use crate::{SourceFile, validation, TextUnit, TextRange, AstNode};
use ra_text_edit::AtomTextEdit;
use std::str::{self, FromStr};
fn check_file_invariants(file: &SourceFile) {
let root = file.syntax();
validation::validate_block_structure(root);
}
pub fn check_parser(text: &str) {
let file = SourceFile::parse(text);
check_file_invariants(&file.tree);
}
#[derive(Debug, Clone)]
pub struct CheckReparse {
text: String,
edit: AtomTextEdit,
edited_text: String,
}
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()? + 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),
TextUnit::from_usize(delete_len),
);
let edited_text =
format!("{}{}{}", &text[..delete_start], &insert, &text[delete_start + delete_len..]);
let edit = AtomTextEdit { delete, insert };
Some(CheckReparse { text, edit, edited_text })
}
pub fn run(&self) {
let parse = SourceFile::parse(&self.text);
let new_parse = parse.reparse(&self.edit);
check_file_invariants(&new_parse.tree);
assert_eq!(&new_parse.tree.syntax().text().to_string(), &self.edited_text);
let full_reparse = SourceFile::parse(&self.edited_text);
for (a, b) in
new_parse.tree.syntax().descendants().zip(full_reparse.tree.syntax().descendants())
{
if (a.kind(), a.range()) != (b.kind(), b.range()) {
eprint!("original:\n{}", parse.tree.syntax().debug_dump());
eprint!("reparsed:\n{}", new_parse.tree.syntax().debug_dump());
eprint!("full reparse:\n{}", full_reparse.tree.syntax().debug_dump());
assert_eq!(
format!("{:?}", a),
format!("{:?}", b),
"different syntax tree produced by the full reparse"
);
}
}
// FIXME
// assert_eq!(new_file.errors(), full_reparse.errors());
}
}
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