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.
12 extern crate rustfmt_nightly as rustfmt;
15 use std::collections::HashMap;
17 use std::io::{self, BufRead, BufReader, Read, Write};
18 use std::path::{Path, PathBuf};
19 use std::process::{Command, Stdio};
22 use rustfmt::filemap::{write_system_newlines, FileMap};
23 use rustfmt::config::{Config, ReportTactic};
24 use rustfmt::rustfmt_diff::*;
26 const DIFF_CONTEXT_SIZE: usize = 3;
28 fn get_path_string(dir_entry: io::Result<fs::DirEntry>) -> String {
29 let path = dir_entry.expect("Couldn't get DirEntry").path();
31 path.to_str().expect("Couldn't stringify path").to_owned()
34 // Integration tests. The files in the tests/source are formatted and compared
35 // to their equivalent in tests/target. The target file and config can be
36 // overridden by annotations in the source file. The input and output must match
40 // Get all files in the tests/source directory.
41 let files = fs::read_dir("tests/source").expect("Couldn't read source dir");
42 // Turn a DirEntry into a String that represents the relative path to the
44 let files = files.map(get_path_string);
45 let (_reports, count, fails) = check_files(files);
48 println!("Ran {} system tests.", count);
49 assert_eq!(fails, 0, "{} system tests failed", fails);
52 // Do the same for tests/coverage-source directory
53 // the only difference is the coverage mode
56 let files = fs::read_dir("tests/coverage/source").expect("Couldn't read source dir");
57 let files = files.map(get_path_string);
58 let (_reports, count, fails) = check_files(files);
60 println!("Ran {} tests in coverage mode.", count);
61 assert_eq!(fails, 0, "{} tests failed", fails);
65 fn checkstyle_test() {
66 let filename = "tests/writemode/source/fn-single-line.rs";
67 let expected_filename = "tests/writemode/target/checkstyle.xml";
68 assert_output(filename, expected_filename);
72 // Helper function for comparing the results of rustfmt
73 // to a known output file generated by one of the write modes.
74 fn assert_output(source: &str, expected_filename: &str) {
75 let config = read_config(source);
76 let (file_map, _report) = format_file(source, &config);
78 // Populate output by writing to a vec.
80 let _ = filemap::write_all_files(&file_map, &mut out, &config);
81 let output = String::from_utf8(out).unwrap();
83 let mut expected_file = fs::File::open(&expected_filename).expect("Couldn't open target");
84 let mut expected_text = String::new();
86 .read_to_string(&mut expected_text)
87 .expect("Failed reading target");
89 let compare = make_diff(&expected_text, &output, DIFF_CONTEXT_SIZE);
90 if !compare.is_empty() {
91 let mut failures = HashMap::new();
92 failures.insert(source.to_string(), compare);
93 print_mismatches(failures);
94 assert!(false, "Text does not match expected output");
98 // Idempotence tests. Files in tests/target are checked to be unaltered by
101 fn idempotence_tests() {
102 // Get all files in the tests/target directory.
103 let files = fs::read_dir("tests/target")
104 .expect("Couldn't read target dir")
105 .map(get_path_string);
106 let (_reports, count, fails) = check_files(files);
109 println!("Ran {} idempotent tests.", count);
110 assert_eq!(fails, 0, "{} idempotent tests failed", fails);
113 // Run rustfmt on itself. This operation must be idempotent. We also check that
114 // no warnings are emitted.
117 let files = fs::read_dir("src/bin")
118 .expect("Couldn't read src dir")
119 .chain(fs::read_dir("tests").expect("Couldn't read tests dir"))
120 .map(get_path_string);
121 // Hack because there's no `IntoIterator` impl for `[T; N]`.
122 let files = files.chain(Some("src/lib.rs".to_owned()).into_iter());
123 let files = files.chain(Some("build.rs".to_owned()).into_iter());
125 let (reports, count, fails) = check_files(files);
126 let mut warnings = 0;
129 println!("Ran {} self tests.", count);
130 assert_eq!(fails, 0, "{} self tests failed", fails);
132 for format_report in reports {
133 println!("{}", format_report);
134 warnings += format_report.warning_count();
140 "Rustfmt's code generated {} warnings",
146 fn stdin_formatting_smoke_test() {
147 let input = Input::Text("fn main () {}".to_owned());
148 let config = Config::default();
149 let (error_summary, file_map, _report) =
150 format_input::<io::Stdout>(input, &config, None).unwrap();
151 assert!(error_summary.has_no_errors());
152 for &(ref file_name, ref text) in &file_map {
153 if file_name == "stdin" {
154 assert_eq!(text.to_string(), "fn main() {}\n");
162 fn stdin_disable_all_formatting_test() {
163 let input = String::from("fn main() { println!(\"This should not be formatted.\"); }");
164 let mut child = Command::new("./target/debug/rustfmt")
165 .stdin(Stdio::piped())
166 .stdout(Stdio::piped())
167 .arg("--config-path=./tests/config/disable_all_formatting.toml")
169 .expect("failed to execute child");
172 let stdin = child.stdin.as_mut().expect("failed to get stdin");
174 .write_all(input.as_bytes())
175 .expect("failed to write stdin");
177 let output = child.wait_with_output().expect("failed to wait on child");
178 assert!(output.status.success());
179 assert!(output.stderr.is_empty());
180 assert_eq!(input, String::from_utf8(output.stdout).unwrap());
184 fn format_lines_errors_are_reported() {
185 let long_identifier = String::from_utf8(vec![b'a'; 239]).unwrap();
186 let input = Input::Text(format!("fn {}() {{}}", long_identifier));
187 let config = Config::default();
188 let (error_summary, _file_map, _report) =
189 format_input::<io::Stdout>(input, &config, None).unwrap();
190 assert!(error_summary.has_formatting_errors());
193 // For each file, run rustfmt and collect the output.
194 // Returns the number of files checked and the number of failures.
195 fn check_files<I>(files: I) -> (Vec<FormatReport>, u32, u32)
197 I: Iterator<Item = String>,
201 let mut reports = vec![];
203 for file_name in files.filter(|f| f.ends_with(".rs")) {
204 match idempotent_check(file_name) {
205 Ok(ref report) if report.has_warnings() => {
206 print!("{}", report);
209 Ok(report) => reports.push(report),
211 print_mismatches(msg);
219 (reports, count, fails)
222 fn print_mismatches(result: HashMap<String, Vec<Mismatch>>) {
223 let mut t = term::stdout().unwrap();
225 for (file_name, diff) in result {
226 print_diff(diff, |line_num| {
227 format!("\nMismatch at {}:{}:", file_name, line_num)
234 fn read_config(filename: &str) -> Config {
235 let sig_comments = read_significant_comments(filename);
236 // Look for a config file... If there is a 'config' property in the significant comments, use
237 // that. Otherwise, if there are no significant comments at all, look for a config file with
238 // the same name as the test file.
239 let mut config = if !sig_comments.is_empty() {
240 get_config(sig_comments.get("config").map(|x| &(*x)[..]))
244 .with_extension("toml")
246 .and_then(std::ffi::OsStr::to_str),
250 for (key, val) in &sig_comments {
251 if key != "target" && key != "config" {
252 config.override_value(key, val);
256 // Don't generate warnings for to-do items.
257 config.set().report_todo(ReportTactic::Never);
262 fn format_file<P: Into<PathBuf>>(filepath: P, config: &Config) -> (FileMap, FormatReport) {
263 let filepath = filepath.into();
264 let input = Input::File(filepath);
265 let (_error_summary, file_map, report) =
266 format_input::<io::Stdout>(input, config, None).unwrap();
270 pub fn idempotent_check(filename: String) -> Result<FormatReport, HashMap<String, Vec<Mismatch>>> {
271 let sig_comments = read_significant_comments(&filename);
272 let config = read_config(&filename);
273 let (file_map, format_report) = format_file(filename, &config);
275 let mut write_result = HashMap::new();
276 for &(ref filename, ref text) in &file_map {
277 let mut v = Vec::new();
278 // Won't panic, as we're not doing any IO.
279 write_system_newlines(&mut v, text, &config).unwrap();
280 // Won't panic, we are writing correct utf8.
281 let one_result = String::from_utf8(v).unwrap();
282 write_result.insert(filename.clone(), one_result);
285 let target = sig_comments.get("target").map(|x| &(*x)[..]);
287 handle_result(write_result, target).map(|_| format_report)
290 // Reads test config file using the supplied (optional) file name. If there's no file name or the
291 // file doesn't exist, just return the default config. Otherwise, the file must be read
293 fn get_config(config_file: Option<&str>) -> Config {
294 let config_file_name = match config_file {
295 None => return Default::default(),
297 let mut full_path = "tests/config/".to_owned();
298 full_path.push_str(file_name);
299 if !Path::new(&full_path).exists() {
300 return Default::default();
306 let mut def_config_file = fs::File::open(config_file_name).expect("Couldn't open config");
307 let mut def_config = String::new();
309 .read_to_string(&mut def_config)
310 .expect("Couldn't read config");
312 Config::from_toml(&def_config).expect("Invalid toml")
315 // Reads significant comments of the form: // rustfmt-key: value
317 fn read_significant_comments(file_name: &str) -> HashMap<String, String> {
318 let file = fs::File::open(file_name).expect(&format!("Couldn't read file {}", file_name));
319 let reader = BufReader::new(file);
320 let pattern = r"^\s*//\s*rustfmt-([^:]+):\s*(\S+)";
321 let regex = regex::Regex::new(pattern).expect("Failed creating pattern 1");
323 // Matches lines containing significant comments or whitespace.
324 let line_regex = regex::Regex::new(r"(^\s*$)|(^\s*//\s*rustfmt-[^:]+:\s*\S+)")
325 .expect("Failed creating pattern 2");
329 .map(|line| line.expect("Failed getting line"))
330 .take_while(|line| line_regex.is_match(line))
332 regex.captures_iter(&line).next().map(|capture| {
336 .expect("Couldn't unwrap capture")
341 .expect("Couldn't unwrap capture")
350 // Compare output to input.
351 // TODO: needs a better name, more explanation.
353 result: HashMap<String, String>,
354 target: Option<&str>,
355 ) -> Result<(), HashMap<String, Vec<Mismatch>>> {
356 let mut failures = HashMap::new();
358 for (file_name, fmt_text) in result {
359 // If file is in tests/source, compare to file with same name in tests/target.
360 let target = get_target(&file_name, target);
361 let open_error = format!("Couldn't open target {:?}", &target);
362 let mut f = fs::File::open(&target).expect(&open_error);
364 let mut text = String::new();
365 let read_error = format!("Failed reading target {:?}", &target);
366 f.read_to_string(&mut text).expect(&read_error);
368 if fmt_text != text {
369 let diff = make_diff(&text, &fmt_text, DIFF_CONTEXT_SIZE);
372 "Empty diff? Maybe due to a missing a newline at the end of a file?"
374 failures.insert(file_name, diff);
378 if failures.is_empty() {
385 // Map source file paths to their target paths.
386 fn get_target(file_name: &str, target: Option<&str>) -> String {
387 if file_name.contains("source") {
388 let target_file_name = file_name.replace("source", "target");
389 if let Some(replace_name) = target {
390 Path::new(&target_file_name)
391 .with_file_name(replace_name)
399 // This is either and idempotence check or a self check
405 fn rustfmt_diff_make_diff_tests() {
406 let diff = make_diff("a\nb\nc\nd", "a\ne\nc\nd", 3);
413 DiffLine::Context("a".into()),
414 DiffLine::Resulting("b".into()),
415 DiffLine::Expected("e".into()),
416 DiffLine::Context("c".into()),
417 DiffLine::Context("d".into()),
425 fn rustfmt_diff_no_diff_test() {
426 let diff = make_diff("a\nb\nc\nd", "a\nb\nc\nd", 3);
427 assert_eq!(diff, vec![]);