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extern crate libsyntax2;
#[macro_use]
extern crate test_utils;
extern crate walkdir;
use std::{
fs,
path::{Path, PathBuf},
fmt::Write,
};
use test_utils::extract_range;
use libsyntax2::{
File, AtomEdit,
utils::{dump_tree, check_fuzz_invariants},
};
#[test]
fn lexer_tests() {
dir_tests(&["lexer"], |text| {
let tokens = libsyntax2::tokenize(text);
dump_tokens(&tokens, text)
})
}
#[test]
fn reparse_test() {
fn do_check(before: &str, replace_with: &str) {
let (range, before) = extract_range(before);
let after = libsyntax2::replace_range(before.clone(), range, replace_with);
let fully_reparsed = File::parse(&after);
let incrementally_reparsed = {
let f = File::parse(&before);
let edit = AtomEdit { delete: range, insert: replace_with.to_string() };
f.incremental_reparse(&edit).unwrap()
};
assert_eq_text!(
&dump_tree(fully_reparsed.syntax()),
&dump_tree(incrementally_reparsed.syntax()),
)
}
do_check(r"
fn foo() {
let x = foo + <|>bar<|>
}
", "baz");
do_check(r"
struct Foo {
f: foo<|><|>
}
", ",\n g: (),");
do_check(r"
fn foo {
let;
1 + 1;
<|>92<|>;
}
", "62");
do_check(r"
mod foo {
fn <|><|>
}
", "bar");
do_check(r"
trait Foo {
type <|>Foo<|>;
}
", "Output");
do_check(r"
impl IntoIterator<Item=i32> for Foo {
f<|><|>
}
", "n next(");
do_check(r"
use a::b::{foo,<|>,bar<|>};
", "baz");
do_check(r"
pub enum A {
Foo<|><|>
}
", "\nBar;\n");
do_check(r"
foo!{a, b<|><|> d}
", ", c[3]");
do_check(r"
fn foo() {
vec![<|><|>]
}
", "123");
do_check(r"
extern {
fn<|>;<|>
}
", " exit(code: c_int)");
}
#[test]
fn parser_tests() {
dir_tests(&["parser/inline", "parser/ok", "parser/err"], |text| {
let file = File::parse(text);
dump_tree(file.syntax())
})
}
#[test]
fn parser_fuzz_tests() {
for (_, text) in collect_tests(&["parser/fuzz-failures"]) {
check_fuzz_invariants(&text)
}
}
/// 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, input_code) in collect_tests(paths) {
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);
}
}
const REWRITE: bool = false;
fn assert_equal_text(expected: &str, actual: &str, path: &Path) {
if expected == actual {
return;
}
let dir = project_dir();
let pretty_path = path.strip_prefix(&dir).unwrap_or_else(|_| path);
if expected.trim() == actual.trim() {
println!("whitespace difference, rewriting");
println!("file: {}\n", pretty_path.display());
fs::write(path, actual).unwrap();
return;
}
if REWRITE {
println!("rewriting {}", pretty_path.display());
fs::write(path, actual).unwrap();
return;
}
assert_eq_text!(expected, actual, "file: {}", pretty_path.display());
}
fn collect_tests(paths: &[&str]) -> Vec<(PathBuf, String)> {
paths
.iter()
.flat_map(|path| {
let path = test_data_dir().join(path);
test_from_dir(&path).into_iter()
})
.map(|path| {
let text = read_text(&path);
(path, text)
})
.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
}
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("crates/libsyntax2/tests/data")
}
fn dump_tokens(tokens: &[libsyntax2::Token], text: &str) -> String {
let mut acc = String::new();
let mut offset = 0;
for token in tokens {
let len: u32 = token.len.into();
let len = len as usize;
let token_text = &text[offset..offset + len];
offset += len;
write!(acc, "{:?} {} {:?}\n", token.kind, token.len, token_text).unwrap()
}
acc
}
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