rust/tests/system.rs

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// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
#![feature(rustc_private)]
#[macro_use]
extern crate lazy_static;
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#[macro_use]
extern crate log;
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extern crate regex;
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extern crate rustfmt_nightly as rustfmt;
extern crate term;
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use std::collections::HashMap;
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use std::fs;
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use std::io::{self, BufRead, BufReader, Read};
use std::iter::{Enumerate, Peekable};
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use std::path::{Path, PathBuf};
use std::str::Chars;
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use rustfmt::*;
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use rustfmt::config::{Color, Config, ReportTactic};
use rustfmt::filemap::{write_system_newlines, FileMap};
use rustfmt::rustfmt_diff::*;
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const DIFF_CONTEXT_SIZE: usize = 3;
const CONFIGURATIONS_FILE_NAME: &str = "Configurations.md";
// Returns a `Vec` containing `PathBuf`s of files with a rs extension in the
// given path. The `recursive` argument controls if files from subdirectories
// are also returned.
fn get_test_files(path: &Path, recursive: bool) -> Vec<PathBuf> {
let mut files = vec![];
if path.is_dir() {
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for entry in fs::read_dir(path).expect(&format!(
"Couldn't read directory {}",
path.to_str().unwrap()
)) {
let entry = entry.expect("Couldn't get DirEntry");
let path = entry.path();
if path.is_dir() && recursive {
files.append(&mut get_test_files(&path, recursive));
} else if path.extension().map_or(false, |f| f == "rs") {
files.push(path);
}
}
}
files
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}
fn verify_config_used(path: &Path, config_name: &str) {
for entry in fs::read_dir(path).expect(&format!(
"Couldn't read {} directory",
path.to_str().unwrap()
)) {
let entry = entry.expect("Couldn't get directory entry");
let path = entry.path();
if path.extension().map_or(false, |f| f == "rs") {
// check if "// rustfmt-<config_name>:" appears in the file.
let filebuf = BufReader::new(
fs::File::open(&path).expect(&format!("Couldn't read file {}", path.display())),
);
assert!(
filebuf
.lines()
.map(|l| l.unwrap())
.take_while(|l| l.starts_with("//"))
.any(|l| l.starts_with(&format!("// rustfmt-{}", config_name))),
format!(
"config option file {} does not contain expected config name",
path.display()
)
);
}
}
}
#[test]
fn verify_config_test_names() {
for path in &[
Path::new("tests/source/configs"),
Path::new("tests/target/configs"),
] {
for entry in fs::read_dir(path).expect("Couldn't read configs directory") {
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let entry = entry.expect("Couldn't get directory entry");
let path = entry.path();
if path.is_dir() {
let config_name = path.file_name().unwrap().to_str().unwrap();
// Make sure that config name is used in the files in the directory.
verify_config_used(&path, &config_name);
}
}
}
}
// This writes to the terminal using the same approach (via term::stdout or
// println!) that is used by `rustfmt::rustfmt_diff::print_diff`. Writing
// using only one or the other will cause the output order to differ when
// `print_diff` selects the approach not used.
fn write_message(msg: String) {
match PrintType::get(Color::Auto) {
PrintType::Fancy => writeln!(term::stdout().unwrap(), "{}", msg).unwrap(),
PrintType::Basic => println!("{}", msg),
}
}
// Integration tests. The files in the tests/source are formatted and compared
// to their equivalent in tests/target. The target file and config can be
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// overridden by annotations in the source file. The input and output must match
// exactly.
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#[test]
fn system_tests() {
// Get all files in the tests/source directory.
let files = get_test_files(Path::new("tests/source"), true);
let (_reports, count, fails) = check_files(files);
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// Display results.
println!("Ran {} system tests.", count);
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assert_eq!(fails, 0, "{} system tests failed", fails);
}
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// Do the same for tests/coverage-source directory
// the only difference is the coverage mode
#[test]
fn coverage_tests() {
let files = get_test_files(Path::new("tests/coverage/source"), true);
let (_reports, count, fails) = check_files(files);
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println!("Ran {} tests in coverage mode.", count);
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assert_eq!(fails, 0, "{} tests failed", fails);
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}
#[test]
fn checkstyle_test() {
let filename = "tests/writemode/source/fn-single-line.rs";
let expected_filename = "tests/writemode/target/checkstyle.xml";
assert_output(Path::new(filename), Path::new(expected_filename));
}
// Helper function for comparing the results of rustfmt
// to a known output file generated by one of the write modes.
fn assert_output(source: &Path, expected_filename: &Path) {
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let config = read_config(source);
let (_error_summary, file_map, _report) = format_file(source, &config);
// Populate output by writing to a vec.
let mut out = vec![];
let _ = filemap::write_all_files(&file_map, &mut out, &config);
let output = String::from_utf8(out).unwrap();
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let mut expected_file = fs::File::open(&expected_filename).expect("Couldn't open target");
let mut expected_text = String::new();
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expected_file
.read_to_string(&mut expected_text)
.expect("Failed reading target");
let compare = make_diff(&expected_text, &output, DIFF_CONTEXT_SIZE);
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if !compare.is_empty() {
let mut failures = HashMap::new();
failures.insert(source.to_owned(), compare);
print_mismatches_default_message(failures, source.display());
assert!(false, "Text does not match expected output");
}
}
// Idempotence tests. Files in tests/target are checked to be unaltered by
// rustfmt.
#[test]
fn idempotence_tests() {
// Get all files in the tests/target directory.
let files = get_test_files(Path::new("tests/target"), true);
let (_reports, count, fails) = check_files(files);
// Display results.
println!("Ran {} idempotent tests.", count);
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assert_eq!(fails, 0, "{} idempotent tests failed", fails);
}
// Run rustfmt on itself. This operation must be idempotent. We also check that
// no warnings are emitted.
#[test]
fn self_tests() {
let mut files = get_test_files(Path::new("src/bin"), false);
files.append(&mut get_test_files(Path::new("tests"), false));
files.push(PathBuf::from("src/lib.rs"));
files.push(PathBuf::from("build.rs"));
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let (reports, count, fails) = check_files(files);
let mut warnings = 0;
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// Display results.
println!("Ran {} self tests.", count);
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assert_eq!(fails, 0, "{} self tests failed", fails);
for format_report in reports {
println!("{}", format_report);
warnings += format_report.warning_count();
}
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assert_eq!(
warnings, 0,
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"Rustfmt's code generated {} warnings",
warnings
);
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}
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#[test]
fn stdin_formatting_smoke_test() {
let input = Input::Text("fn main () {}".to_owned());
let config = Config::default();
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let (error_summary, file_map, _report) =
format_input::<io::Stdout>(input, &config, None).unwrap();
assert!(error_summary.has_no_errors());
for &(ref file_name, ref text) in &file_map {
if let FileName::Custom(ref file_name) = *file_name {
if file_name == "stdin" {
assert_eq!(text.to_string(), "fn main() {}\n");
return;
}
}
}
panic!("no stdin");
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}
// FIXME(#1990) restore this test
// #[test]
// fn stdin_disable_all_formatting_test() {
// let input = String::from("fn main() { println!(\"This should not be formatted.\"); }");
// let mut child = Command::new("./target/debug/rustfmt")
// .stdin(Stdio::piped())
// .stdout(Stdio::piped())
// .arg("--config-path=./tests/config/disable_all_formatting.toml")
// .spawn()
// .expect("failed to execute child");
// {
// let stdin = child.stdin.as_mut().expect("failed to get stdin");
// stdin
// .write_all(input.as_bytes())
// .expect("failed to write stdin");
// }
// let output = child.wait_with_output().expect("failed to wait on child");
// assert!(output.status.success());
// assert!(output.stderr.is_empty());
// assert_eq!(input, String::from_utf8(output.stdout).unwrap());
// }
#[test]
fn format_lines_errors_are_reported() {
let long_identifier = String::from_utf8(vec![b'a'; 239]).unwrap();
let input = Input::Text(format!("fn {}() {{}}", long_identifier));
let config = Config::default();
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let (error_summary, _file_map, _report) =
format_input::<io::Stdout>(input, &config, None).unwrap();
assert!(error_summary.has_formatting_errors());
}
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// For each file, run rustfmt and collect the output.
// Returns the number of files checked and the number of failures.
fn check_files(files: Vec<PathBuf>) -> (Vec<FormatReport>, u32, u32) {
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let mut count = 0;
let mut fails = 0;
let mut reports = vec![];
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for file_name in files {
debug!("Testing '{}'...", file_name.display());
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match idempotent_check(&file_name) {
Ok(ref report) if report.has_warnings() => {
print!("{}", report);
fails += 1;
}
Ok(report) => reports.push(report),
Err(err) => {
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if let IdempotentCheckError::Mismatch(msg) = err {
print_mismatches_default_message(msg, file_name.display());
}
fails += 1;
}
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}
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count += 1;
}
(reports, count, fails)
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}
fn print_mismatches_default_message(
result: HashMap<PathBuf, Vec<Mismatch>>,
file_name: std::path::Display,
) {
print_mismatches(result, |line_num| {
format!("\nMismatch at {}:{}:", file_name, line_num)
});
}
fn print_mismatches<T: Fn(u32) -> String>(
result: HashMap<PathBuf, Vec<Mismatch>>,
mismatch_msg_formatter: T,
) {
let mut t = term::stdout().unwrap();
for (_file_name, diff) in result {
print_diff(diff, &mismatch_msg_formatter, Color::Auto);
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}
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t.reset().unwrap();
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}
fn read_config(filename: &Path) -> Config {
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let sig_comments = read_significant_comments(filename);
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// Look for a config file... If there is a 'config' property in the significant comments, use
// that. Otherwise, if there are no significant comments at all, look for a config file with
// the same name as the test file.
let mut config = if !sig_comments.is_empty() {
get_config(sig_comments.get("config").map(Path::new))
} else {
get_config(filename.with_extension("toml").file_name().map(Path::new))
};
for (key, val) in &sig_comments {
if key != "target" && key != "config" {
config.override_value(key, val);
}
}
// Don't generate warnings for to-do items.
config.set().report_todo(ReportTactic::Never);
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config
}
fn format_file<P: Into<PathBuf>>(filepath: P, config: &Config) -> (Summary, FileMap, FormatReport) {
let filepath = filepath.into();
let input = Input::File(filepath);
format_input::<io::Stdout>(input, config, None).unwrap()
}
pub enum IdempotentCheckError {
Mismatch(HashMap<PathBuf, Vec<Mismatch>>),
Parse,
}
pub fn idempotent_check(filename: &PathBuf) -> Result<FormatReport, IdempotentCheckError> {
let sig_comments = read_significant_comments(&filename);
let config = read_config(&filename);
let (error_summary, file_map, format_report) = format_file(filename, &config);
if error_summary.has_parsing_errors() {
return Err(IdempotentCheckError::Parse);
}
let mut write_result = HashMap::new();
for &(ref filename, ref text) in &file_map {
let mut v = Vec::new();
// Won't panic, as we're not doing any IO.
write_system_newlines(&mut v, text, &config).unwrap();
// Won't panic, we are writing correct utf8.
let one_result = String::from_utf8(v).unwrap();
if let FileName::Real(ref filename) = *filename {
write_result.insert(filename.to_owned(), one_result);
}
}
let target = sig_comments.get("target").map(|x| &(*x)[..]);
handle_result(write_result, target).map(|_| format_report)
}
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// Reads test config file using the supplied (optional) file name. If there's no file name or the
// file doesn't exist, just return the default config. Otherwise, the file must be read
// successfully.
fn get_config(config_file: Option<&Path>) -> Config {
let config_file_name = match config_file {
None => return Default::default(),
Some(file_name) => {
let mut full_path = PathBuf::from("tests/config/");
full_path.push(file_name);
if !full_path.exists() {
return Default::default();
};
full_path
}
};
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let mut def_config_file = fs::File::open(config_file_name).expect("Couldn't open config");
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let mut def_config = String::new();
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def_config_file
.read_to_string(&mut def_config)
.expect("Couldn't read config");
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Config::from_toml(&def_config).expect("Invalid toml")
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}
// Reads significant comments of the form: // rustfmt-key: value
// into a hash map.
fn read_significant_comments(file_name: &Path) -> HashMap<String, String> {
let file =
fs::File::open(file_name).expect(&format!("Couldn't read file {}", file_name.display()));
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let reader = BufReader::new(file);
let pattern = r"^\s*//\s*rustfmt-([^:]+):\s*(\S+)";
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let regex = regex::Regex::new(pattern).expect("Failed creating pattern 1");
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// Matches lines containing significant comments or whitespace.
let line_regex = regex::Regex::new(r"(^\s*$)|(^\s*//\s*rustfmt-[^:]+:\s*\S+)")
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.expect("Failed creating pattern 2");
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reader
.lines()
.map(|line| line.expect("Failed getting line"))
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.take_while(|line| line_regex.is_match(line))
.filter_map(|line| {
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regex.captures_iter(&line).next().map(|capture| {
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(
capture
.get(1)
.expect("Couldn't unwrap capture")
.as_str()
.to_owned(),
capture
.get(2)
.expect("Couldn't unwrap capture")
.as_str()
.to_owned(),
)
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})
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})
.collect()
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}
// Compare output to input.
// TODO: needs a better name, more explanation.
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fn handle_result(
result: HashMap<PathBuf, String>,
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target: Option<&str>,
) -> Result<(), IdempotentCheckError> {
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let mut failures = HashMap::new();
for (file_name, fmt_text) in result {
// If file is in tests/source, compare to file with same name in tests/target.
let target = get_target(&file_name, target);
let open_error = format!("Couldn't open target {:?}", &target);
let mut f = fs::File::open(&target).expect(&open_error);
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let mut text = String::new();
let read_error = format!("Failed reading target {:?}", &target);
f.read_to_string(&mut text).expect(&read_error);
// Ignore LF and CRLF difference for Windows.
if !string_eq_ignore_newline_repr(&fmt_text, &text) {
let diff = make_diff(&text, &fmt_text, DIFF_CONTEXT_SIZE);
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assert!(
!diff.is_empty(),
"Empty diff? Maybe due to a missing a newline at the end of a file?"
);
failures.insert(file_name, diff);
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}
}
if failures.is_empty() {
Ok(())
} else {
Err(IdempotentCheckError::Mismatch(failures))
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}
}
// Map source file paths to their target paths.
fn get_target(file_name: &Path, target: Option<&str>) -> PathBuf {
if let Some(n) = file_name
.components()
.position(|c| c.as_os_str() == "source")
{
let mut target_file_name = PathBuf::new();
for (i, c) in file_name.components().enumerate() {
if i == n {
target_file_name.push("target");
} else {
target_file_name.push(c.as_os_str());
}
}
if let Some(replace_name) = target {
target_file_name.with_file_name(replace_name)
} else {
target_file_name
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}
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} else {
// This is either and idempotence check or a self check
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file_name.to_owned()
}
}
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#[test]
fn rustfmt_diff_make_diff_tests() {
let diff = make_diff("a\nb\nc\nd", "a\ne\nc\nd", 3);
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assert_eq!(
diff,
vec![
Mismatch {
line_number: 1,
lines: vec![
DiffLine::Context("a".into()),
DiffLine::Resulting("b".into()),
DiffLine::Expected("e".into()),
DiffLine::Context("c".into()),
DiffLine::Context("d".into()),
],
},
]
);
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}
#[test]
fn rustfmt_diff_no_diff_test() {
let diff = make_diff("a\nb\nc\nd", "a\nb\nc\nd", 3);
assert_eq!(diff, vec![]);
}
// Compare strings without distinguishing between CRLF and LF
fn string_eq_ignore_newline_repr(left: &str, right: &str) -> bool {
let left = CharsIgnoreNewlineRepr(left.chars().peekable());
let right = CharsIgnoreNewlineRepr(right.chars().peekable());
left.eq(right)
}
struct CharsIgnoreNewlineRepr<'a>(Peekable<Chars<'a>>);
impl<'a> Iterator for CharsIgnoreNewlineRepr<'a> {
type Item = char;
fn next(&mut self) -> Option<char> {
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self.0.next().map(|c| {
if c == '\r' {
if *self.0.peek().unwrap_or(&'\0') == '\n' {
self.0.next();
'\n'
} else {
'\r'
}
} else {
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c
}
})
}
}
#[test]
fn string_eq_ignore_newline_repr_test() {
assert!(string_eq_ignore_newline_repr("", ""));
assert!(!string_eq_ignore_newline_repr("", "abc"));
assert!(!string_eq_ignore_newline_repr("abc", ""));
assert!(string_eq_ignore_newline_repr("a\nb\nc\rd", "a\nb\r\nc\rd"));
assert!(string_eq_ignore_newline_repr("a\r\n\r\n\r\nb", "a\n\n\nb"));
assert!(!string_eq_ignore_newline_repr("a\r\nbcd", "a\nbcdefghijk"));
}
// This enum is used to represent one of three text features in Configurations.md: a block of code
// with its starting line number, the name of a rustfmt configuration option, or the value of a
// rustfmt configuration option.
enum ConfigurationSection {
CodeBlock((String, u32)), // (String: block of code, u32: line number of code block start)
ConfigName(String),
ConfigValue(String),
}
impl ConfigurationSection {
fn get_section<I: Iterator<Item = String>>(
file: &mut Enumerate<I>,
) -> Option<ConfigurationSection> {
lazy_static! {
static ref CONFIG_NAME_REGEX: regex::Regex = regex::Regex::new(r"^## `([^`]+)`").expect("Failed creating configuration pattern");
static ref CONFIG_VALUE_REGEX: regex::Regex = regex::Regex::new(r#"^#### `"?([^`"]+)"?`"#).expect("Failed creating configuration value pattern");
}
loop {
match file.next() {
Some((i, line)) => {
if line.starts_with("```rust") {
// Get the lines of the code block.
let lines: Vec<String> = file.map(|(_i, l)| l)
.take_while(|l| !l.starts_with("```"))
.collect();
let block = format!("{}\n", lines.join("\n"));
// +1 to translate to one-based indexing
// +1 to get to first line of code (line after "```")
let start_line = (i + 2) as u32;
return Some(ConfigurationSection::CodeBlock((block, start_line)));
} else if let Some(c) = CONFIG_NAME_REGEX.captures(&line) {
return Some(ConfigurationSection::ConfigName(String::from(&c[1])));
} else if let Some(c) = CONFIG_VALUE_REGEX.captures(&line) {
return Some(ConfigurationSection::ConfigValue(String::from(&c[1])));
}
}
None => return None, // reached the end of the file
}
}
}
}
// This struct stores the information about code blocks in the configurations
// file, formats the code blocks, and prints formatting errors.
struct ConfigCodeBlock {
config_name: Option<String>,
config_value: Option<String>,
code_block: Option<String>,
code_block_start: Option<u32>,
}
impl ConfigCodeBlock {
fn new() -> ConfigCodeBlock {
ConfigCodeBlock {
config_name: None,
config_value: None,
code_block: None,
code_block_start: None,
}
}
fn set_config_name(&mut self, name: Option<String>) {
self.config_name = name;
self.config_value = None;
}
fn set_config_value(&mut self, value: Option<String>) {
self.config_value = value;
}
fn set_code_block(&mut self, code_block: String, code_block_start: u32) {
self.code_block = Some(code_block);
self.code_block_start = Some(code_block_start);
}
fn get_block_config(&self) -> Config {
let mut config = Config::default();
config.override_value(
self.config_name.as_ref().unwrap(),
self.config_value.as_ref().unwrap(),
);
config
}
fn code_block_valid(&self) -> bool {
// We never expect to not have a code block.
assert!(self.code_block.is_some() && self.code_block_start.is_some());
if self.config_name.is_none() {
write_message(format!(
"configuration name not found for block beginning at line {}",
self.code_block_start.unwrap()
));
return false;
}
if self.config_value.is_none() {
write_message(format!(
"configuration value not found for block beginning at line {}",
self.code_block_start.unwrap()
));
return false;
}
true
}
fn has_parsing_errors(&self, error_summary: Summary) -> bool {
if error_summary.has_parsing_errors() {
write_message(format!(
"\u{261d}\u{1f3fd} Failed to format block starting at Line {} in {}",
self.code_block_start.unwrap(),
CONFIGURATIONS_FILE_NAME
));
return true;
}
false
}
fn print_diff(&self, compare: Vec<Mismatch>) {
let mut mismatches = HashMap::new();
mismatches.insert(PathBuf::from(CONFIGURATIONS_FILE_NAME), compare);
print_mismatches(mismatches, |line_num| {
format!(
"\nMismatch at {}:{}:",
CONFIGURATIONS_FILE_NAME,
line_num + self.code_block_start.unwrap() - 1
)
});
}
fn formatted_has_diff(&self, file_map: FileMap) -> bool {
let &(ref _file_name, ref text) = file_map.first().unwrap();
let compare = make_diff(self.code_block.as_ref().unwrap(), text, DIFF_CONTEXT_SIZE);
if !compare.is_empty() {
self.print_diff(compare);
return true;
}
false
}
// Return a bool indicating if formatting this code block is an idempotent
// operation. This function also triggers printing any formatting failure
// messages.
fn formatted_is_idempotent(&self) -> bool {
// Verify that we have all of the expected information.
if !self.code_block_valid() {
return false;
}
let input = Input::Text(self.code_block.as_ref().unwrap().to_owned());
let config = self.get_block_config();
let (error_summary, file_map, _report) =
format_input::<io::Stdout>(input, &config, None).unwrap();
!self.has_parsing_errors(error_summary) && !self.formatted_has_diff(file_map)
}
// Extract a code block from the iterator. Behavior:
// - Rust code blocks are identifed by lines beginning with "```rust".
// - One explicit configuration setting is supported per code block.
// - Rust code blocks with no configuration setting are illegal and cause an
// assertion failure.
// - Configuration names in Configurations.md must be in the form of
// "## `NAME`".
// - Configuration values in Configurations.md must be in the form of
// "#### `VALUE`".
fn extract<I: Iterator<Item = String>>(
file: &mut Enumerate<I>,
prev: Option<&ConfigCodeBlock>,
) -> Option<ConfigCodeBlock> {
let mut code_block = ConfigCodeBlock::new();
code_block.config_name = prev.map_or(None, |cb| cb.config_name.clone());
loop {
match ConfigurationSection::get_section(file) {
Some(ConfigurationSection::CodeBlock((block, start_line))) => {
code_block.set_code_block(block, start_line);
break;
}
Some(ConfigurationSection::ConfigName(name)) => {
code_block.set_config_name(Some(name));
}
Some(ConfigurationSection::ConfigValue(value)) => {
code_block.set_config_value(Some(value));
}
None => return None, // end of file was reached
}
}
Some(code_block)
}
}
#[test]
#[ignore]
fn configuration_snippet_tests() {
// Read Configurations.md and build a `Vec` of `ConfigCodeBlock` structs with one
// entry for each Rust code block found.
fn get_code_blocks() -> Vec<ConfigCodeBlock> {
let mut file_iter = BufReader::new(
fs::File::open(CONFIGURATIONS_FILE_NAME)
.expect(&format!("Couldn't read file {}", CONFIGURATIONS_FILE_NAME)),
).lines()
.map(|l| l.unwrap())
.enumerate();
let mut code_blocks: Vec<ConfigCodeBlock> = Vec::new();
while let Some(cb) = ConfigCodeBlock::extract(&mut file_iter, code_blocks.last()) {
code_blocks.push(cb);
}
code_blocks
}
let blocks = get_code_blocks();
let failures = blocks
.iter()
.map(|b| b.formatted_is_idempotent())
.fold(0, |acc, r| acc + (!r as u32));
// Display results.
println!("Ran {} configurations tests.", blocks.len());
assert_eq!(failures, 0, "{} configurations tests failed", failures);
}