74 lines
2.6 KiB
Rust
74 lines
2.6 KiB
Rust
//! Some infrastructure for fuzzy testing.
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//!
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//! We don't normally run fuzzying, so this is hopelessly bitrotten :(
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use std::str::{self, FromStr};
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use text_edit::Indel;
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use crate::{validation, AstNode, SourceFile, TextRange};
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fn check_file_invariants(file: &SourceFile) {
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let root = file.syntax();
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validation::validate_block_structure(root);
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}
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pub fn check_parser(text: &str) {
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let file = SourceFile::parse(text);
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check_file_invariants(&file.tree());
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}
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#[derive(Debug, Clone)]
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pub struct CheckReparse {
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text: String,
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edit: Indel,
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edited_text: String,
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}
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impl CheckReparse {
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pub fn from_data(data: &[u8]) -> Option<Self> {
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const PREFIX: &str = "fn main(){\n\t";
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const SUFFIX: &str = "\n}";
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let data = str::from_utf8(data).ok()?;
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let mut lines = data.lines();
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let delete_start = usize::from_str(lines.next()?).ok()? + PREFIX.len();
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let delete_len = usize::from_str(lines.next()?).ok()?;
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let insert = lines.next()?.to_owned();
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let text = lines.collect::<Vec<_>>().join("\n");
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let text = format!("{PREFIX}{text}{SUFFIX}");
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text.get(delete_start..delete_start.checked_add(delete_len)?)?; // make sure delete is a valid range
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let delete =
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TextRange::at(delete_start.try_into().unwrap(), delete_len.try_into().unwrap());
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let edited_text =
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format!("{}{}{}", &text[..delete_start], &insert, &text[delete_start + delete_len..]);
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let edit = Indel { insert, delete };
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Some(CheckReparse { text, edit, edited_text })
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}
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#[allow(clippy::print_stderr)]
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pub fn run(&self) {
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let parse = SourceFile::parse(&self.text);
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let new_parse = parse.reparse(&self.edit);
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check_file_invariants(&new_parse.tree());
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assert_eq!(&new_parse.tree().syntax().text().to_string(), &self.edited_text);
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let full_reparse = SourceFile::parse(&self.edited_text);
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for (a, b) in
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new_parse.tree().syntax().descendants().zip(full_reparse.tree().syntax().descendants())
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{
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if (a.kind(), a.text_range()) != (b.kind(), b.text_range()) {
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eprint!("original:\n{:#?}", parse.tree().syntax());
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eprint!("reparsed:\n{:#?}", new_parse.tree().syntax());
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eprint!("full reparse:\n{:#?}", full_reparse.tree().syntax());
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assert_eq!(
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format!("{a:?}"),
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format!("{b:?}"),
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"different syntax tree produced by the full reparse"
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);
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}
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}
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// FIXME
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// assert_eq!(new_file.errors(), full_reparse.errors());
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}
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}
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