1 // Copyright 2015 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 #![feature(catch_panic)]
17 use std::collections::HashMap;
19 use std::io::{self, Read, BufRead, BufReader};
23 fn get_path_string(dir_entry: io::Result<fs::DirEntry>) -> String {
24 let path = dir_entry.ok().expect("Couldn't get DirEntry.").path();
26 path.to_str().expect("Couldn't stringify path.").to_owned()
29 // Integration tests and idempotence tests. The files in the tests/source are
30 // formatted and compared to their equivalent in tests/target. The target file
31 // and config can be overriden by annotations in the source file. The input and
32 // output must match exactly.
33 // Files in tests/target are checked to be unaltered by rustfmt.
34 // FIXME(#28) would be good to check for error messages and fail on them, or at least report.
37 // Get all files in the tests/target directory
38 let files = fs::read_dir("tests/target").ok().expect("Couldn't read dir 1.");
39 let files = files.chain(fs::read_dir("tests").ok().expect("Couldn't read dir 2."));
40 let files = files.chain(fs::read_dir("src/bin").ok().expect("Couldn't read dir 3."));
41 // turn a DirEntry into a String that represents the relative path to the file
42 let files = files.map(get_path_string);
43 // hack because there's no `IntoIterator` impl for `[T; N]`
44 let files = files.chain(Some("src/lib.rs".to_owned()).into_iter());
46 let (count, fails) = check_files(files);
49 println!("Ran {} idempotent tests.", count);
50 assert!(fails == 0, "{} idempotent tests failed", fails);
52 // Get all files in the tests/source directory
53 let files = fs::read_dir("tests/source").ok().expect("Couldn't read dir 4.");
54 // turn a DirEntry into a String that represents the relative path to the file
55 let files = files.map(get_path_string);
57 let (count, fails) = check_files(files);
60 println!("Ran {} system tests.", count);
61 assert!(fails == 0, "{} system tests failed", fails);
64 // For each file, run rustfmt and collect the output.
65 // Returns the number of files checked and the number of failures.
66 fn check_files<I>(files: I) -> (u32, u32)
67 where I: Iterator<Item = String>
72 for file_name in files.filter(|f| f.ends_with(".rs")) {
73 println!("Testing '{}'...", file_name);
74 match idempotent_check(file_name) {
87 fn print_mismatches(result: HashMap<String, String>) {
88 for (_, fmt_text) in result {
89 println!("{}", fmt_text);
93 // Ick, just needed to get a &'static to handle_result.
94 static HANDLE_RESULT: &'static Fn(HashMap<String, String>) = &handle_result;
96 pub fn idempotent_check(filename: String) -> Result<(), HashMap<String, String>> {
97 let config = get_config(&filename);
98 let args = vec!["rustfmt".to_owned(), filename];
99 // this thread is not used for concurrency, but rather to workaround the issue that the passed
100 // function handle needs to have static lifetime. Instead of using a global RefCell, we use
101 // panic to return a result in case of failure. This has the advantage of smoothing the road to
102 // multithreaded rustfmt
103 thread::catch_panic(move || {
104 run(args, WriteMode::Return(HANDLE_RESULT), &config);
106 *any.downcast().ok().expect("Downcast failed.")
110 // Reads test config file from comments and loads it
111 fn get_config(file_name: &str) -> String {
112 let config_file_name = read_significant_comment(file_name, "config")
114 let mut full_path = "tests/config/".to_owned();
115 full_path.push_str(&file_name);
118 .unwrap_or("default.toml".to_owned());
120 let mut def_config_file = fs::File::open(config_file_name).ok().expect("Couldn't open config.");
121 let mut def_config = String::new();
122 def_config_file.read_to_string(&mut def_config).ok().expect("Couldn't read config.");
127 fn read_significant_comment(file_name: &str, option: &str) -> Option<String> {
128 let file = fs::File::open(file_name).ok().expect("Couldn't read file for comment.");
129 let reader = BufReader::new(file);
130 let pattern = format!("^\\s*//\\s*rustfmt-{}:\\s*(\\S+)", option);
131 let regex = regex::Regex::new(&pattern).ok().expect("Failed creating pattern 1.");
133 // matches exactly the lines containing significant comments or whitespace
134 let line_regex = regex::Regex::new(r"(^\s*$)|(^\s*//\s*rustfmt-[:alpha:]+:\s*\S+)")
135 .ok().expect("Failed creating pattern 2.");
138 .map(|line| line.ok().expect("Failed getting line."))
139 .take_while(|line| line_regex.is_match(&line))
141 regex.captures_iter(&line).next().map(|capture| {
142 capture.at(1).expect("Couldn't unwrap capture.").to_owned()
148 // Compare output to input.
149 fn handle_result(result: HashMap<String, String>) {
150 let mut failures = HashMap::new();
152 for (file_name, fmt_text) in result {
153 // If file is in tests/source, compare to file with same name in tests/target
154 let target_file_name = get_target(&file_name);
155 let mut f = fs::File::open(&target_file_name).ok().expect("Couldn't open target.");
157 let mut text = String::new();
158 // TODO: speedup by running through bytes iterator
159 f.read_to_string(&mut text).ok().expect("Failed reading target.");
160 if fmt_text != text {
161 let diff_str = make_diff(&file_name, &fmt_text, &text);
162 failures.insert(file_name, diff_str);
165 if !failures.is_empty() {
170 // Map source file paths to their target paths.
171 fn get_target(file_name: &str) -> String {
172 if file_name.starts_with("tests/source/") {
173 let target = read_significant_comment(file_name, "target");
174 let base = target.unwrap_or(file_name.trim_left_matches("tests/source/").to_owned());
176 let mut target_file = "tests/target/".to_owned();
177 target_file.push_str(&base);
185 // Produces a diff string between the expected output and actual output of
186 // rustfmt on a given file
187 fn make_diff(file_name: &str, expected: &str, actual: &str) -> String {
188 let mut line_number = 1;
189 let mut prev_both = true;
190 let mut text = String::new();
192 for result in diff::lines(expected, actual) {
194 diff::Result::Left(str) => {
196 text.push_str(&format!("Mismatch @ {}:{}\n", file_name, line_number));
198 text.push_str(&format!("-{}⏎\n", str));
201 diff::Result::Right(str) => {
203 text.push_str(&format!("Mismatch @ {}:{}\n", file_name, line_number));
205 text.push_str(&format!("+{}⏎\n", str));
209 diff::Result::Both(..) => {