139 lines
3.4 KiB
Rust
139 lines
3.4 KiB
Rust
extern crate libsyntax2;
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#[macro_use]
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extern crate assert_eq_text;
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extern crate walkdir;
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use std::{
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fs,
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path::{Path, PathBuf},
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fmt::Write,
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};
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use libsyntax2::File;
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#[test]
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fn lexer_tests() {
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dir_tests(&["lexer"], |text| {
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let tokens = libsyntax2::tokenize(text);
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dump_tokens(&tokens, text)
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})
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}
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#[test]
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fn parser_tests() {
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dir_tests(&["parser/inline", "parser/ok", "parser/err"], |text| {
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let file = File::parse(text);
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libsyntax2::utils::dump_tree(file.syntax())
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})
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}
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/// Read file and normalize newlines.
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///
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/// `rustc` seems to always normalize `\r\n` newlines to `\n`:
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///
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/// ```
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/// let s = "
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/// ";
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/// assert_eq!(s.as_bytes(), &[10]);
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/// ```
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///
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/// so this should always be correct.
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fn read_text(path: &Path) -> String {
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fs::read_to_string(path).unwrap().replace("\r\n", "\n")
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}
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pub fn dir_tests<F>(paths: &[&str], f: F)
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where
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F: Fn(&str) -> String,
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{
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for path in collect_tests(paths) {
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let input_code = read_text(&path);
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let parse_tree = f(&input_code);
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let path = path.with_extension("txt");
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if !path.exists() {
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println!("\nfile: {}", path.display());
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println!("No .txt file with expected result, creating...\n");
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println!("{}\n{}", input_code, parse_tree);
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fs::write(&path, parse_tree).unwrap();
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panic!("No expected result")
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}
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let expected = read_text(&path);
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let expected = expected.as_str();
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let parse_tree = parse_tree.as_str();
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assert_equal_text(expected, parse_tree, &path);
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}
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}
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const REWRITE: bool = false;
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fn assert_equal_text(expected: &str, actual: &str, path: &Path) {
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if expected == actual {
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return;
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}
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let dir = project_dir();
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let pretty_path = path.strip_prefix(&dir).unwrap_or_else(|_| path);
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if expected.trim() == actual.trim() {
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println!("whitespace difference, rewriting");
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println!("file: {}\n", pretty_path.display());
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fs::write(path, actual).unwrap();
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return;
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}
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if REWRITE {
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println!("rewriting {}", pretty_path.display());
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fs::write(path, actual).unwrap();
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return;
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}
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assert_eq_text!(expected, actual, "file: {}", pretty_path.display());
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}
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fn collect_tests(paths: &[&str]) -> Vec<PathBuf> {
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paths
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.iter()
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.flat_map(|path| {
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let path = test_data_dir().join(path);
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test_from_dir(&path).into_iter()
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})
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.collect()
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}
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fn test_from_dir(dir: &Path) -> Vec<PathBuf> {
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let mut acc = Vec::new();
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for file in fs::read_dir(&dir).unwrap() {
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let file = file.unwrap();
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let path = file.path();
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if path.extension().unwrap_or_default() == "rs" {
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acc.push(path);
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}
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}
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acc.sort();
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acc
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}
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fn project_dir() -> PathBuf {
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let dir = env!("CARGO_MANIFEST_DIR");
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PathBuf::from(dir)
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.parent()
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.unwrap()
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.parent()
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.unwrap()
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.to_owned()
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}
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fn test_data_dir() -> PathBuf {
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project_dir().join("crates/libsyntax2/tests/data")
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}
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fn dump_tokens(tokens: &[libsyntax2::Token], text: &str) -> String {
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let mut acc = String::new();
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let mut offset = 0;
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for token in tokens {
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let len: u32 = token.len.into();
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let len = len as usize;
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let token_text = &text[offset..offset + len];
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offset += len;
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write!(acc, "{:?} {} {:?}\n", token.kind, token.len, token_text).unwrap()
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}
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acc
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}
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