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extern crate difference;
use std::{
fs,
path::{Path, PathBuf},
};
use difference::Changeset;
/// Read file and normalize newlines.
///
/// `rustc` seems to always normalize `\r\n` newlines to `\n`:
///
/// ```
/// let s = "
/// ";
/// assert_eq!(s.as_bytes(), &[10]);
/// ```
///
/// so this should always be correct.
fn read_text(path: &Path) -> String {
fs::read_to_string(path).unwrap().replace("\r\n", "\n")
}
pub fn dir_tests<F>(paths: &[&str], f: F)
where
F: Fn(&str) -> String,
{
for path in collect_tests(paths) {
let input_code = read_text(&path);
let parse_tree = f(&input_code);
let path = path.with_extension("txt");
if !path.exists() {
println!("\nfile: {}", path.display());
println!("No .txt file with expected result, creating...\n");
println!("{}\n{}", input_code, parse_tree);
fs::write(&path, parse_tree).unwrap();
panic!("No expected result")
}
let expected = read_text(&path);
let expected = expected.as_str();
let parse_tree = parse_tree.as_str();
assert_equal_text(expected, parse_tree, &path);
}
}
fn assert_equal_text(expected: &str, actual: &str, path: &Path) {
if expected != actual {
print_difference(expected, actual, path)
}
}
fn collect_tests(paths: &[&str]) -> Vec<PathBuf> {
paths
.iter()
.flat_map(|path| {
let path = test_data_dir().join(path);
test_from_dir(&path).into_iter()
})
.collect()
}
fn test_from_dir(dir: &Path) -> Vec<PathBuf> {
let mut acc = Vec::new();
for file in fs::read_dir(&dir).unwrap() {
let file = file.unwrap();
let path = file.path();
if path.extension().unwrap_or_default() == "rs" {
acc.push(path);
}
}
acc.sort();
acc
}
const REWRITE: bool = false;
fn print_difference(expected: &str, actual: &str, path: &Path) {
let dir = project_dir();
let path = path.strip_prefix(&dir).unwrap_or_else(|_| path);
if expected.trim() == actual.trim() {
println!("whitespace difference, rewriting");
println!("file: {}\n", path.display());
fs::write(path, actual).unwrap();
return;
}
if REWRITE {
println!("rewriting {}", path.display());
fs::write(path, actual).unwrap();
return;
}
let changeset = Changeset::new(actual, expected, "\n");
print!("{}", changeset);
println!("file: {}\n", path.display());
panic!("Comparison failed")
}
fn project_dir() -> PathBuf {
let dir = env!("CARGO_MANIFEST_DIR");
PathBuf::from(dir)
.parent()
.unwrap()
.parent()
.unwrap()
.to_owned()
}
fn test_data_dir() -> PathBuf {
project_dir().join("tests/data")
}
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