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#![feature(custom_attribute)]
#![feature(decl_macro)]
#![feature(match_default_bindings)]
#![feature(type_ascription)]
#[macro_use]
extern crate derive_new;
extern crate diff;
extern crate itertools;
#[macro_use]
extern crate log;
extern crate regex;
extern crate serde;
#[macro_use]
extern crate serde_derive;
extern crate serde_json;
extern crate syntax;
extern crate term;
extern crate toml;
extern crate unicode_segmentation;
use std::collections::HashMap;
use std::fmt;
use std::io::{self, stdout, BufRead, Write};
use std::iter::repeat;
use std::panic::{catch_unwind, AssertUnwindSafe};
use std::path::PathBuf;
use std::rc::Rc;
use std::time::Duration;
use syntax::errors::{DiagnosticBuilder, Handler};
use syntax::errors::emitter::{ColorConfig, EmitterWriter};
use syntax::ast;
use syntax::codemap::{CodeMap, FilePathMapping};
pub use syntax::codemap::FileName;
use syntax::parse::{self, ParseSess};
use checkstyle::{output_footer, output_header};
use comment::{CharClasses, FullCodeCharKind};
use issues::{BadIssueSeeker, Issue};
use shape::Indent;
use utils::use_colored_tty;
use visitor::{FmtVisitor, SnippetProvider};
pub use config::Config;
pub use config::summary::Summary;
#[macro_use]
mod utils;
mod attr;
mod chains;
mod checkstyle;
mod closures;
pub mod codemap;
mod comment;
pub mod config;
mod expr;
pub mod filemap;
mod imports;
mod issues;
mod items;
mod lists;
mod macros;
mod missed_spans;
pub mod modules;
mod overflow;
mod patterns;
mod reorder;
mod rewrite;
pub mod rustfmt_diff;
mod shape;
mod spanned;
mod string;
mod types;
mod vertical;
pub mod visitor;
const STDIN: &str = "<stdin>";
pub type FileMap = Vec<FileRecord>;
pub type FileRecord = (FileName, String);
#[derive(Clone, Copy)]
pub enum ErrorKind {
LineOverflow(usize, usize),
TrailingWhitespace,
BadIssue(Issue),
LicenseCheck,
}
impl fmt::Display for ErrorKind {
fn fmt(&self, fmt: &mut fmt::Formatter) -> Result<(), fmt::Error> {
match *self {
ErrorKind::LineOverflow(found, maximum) => write!(
fmt,
"line exceeded maximum width (maximum: {}, found: {})",
maximum, found
),
ErrorKind::TrailingWhitespace => write!(fmt, "left behind trailing whitespace"),
ErrorKind::BadIssue(issue) => write!(fmt, "found {}", issue),
ErrorKind::LicenseCheck => write!(fmt, "license check failed"),
}
}
}
pub struct FormattingError {
line: usize,
kind: ErrorKind,
is_comment: bool,
is_string: bool,
line_buffer: String,
}
impl FormattingError {
fn msg_prefix(&self) -> &str {
match self.kind {
ErrorKind::LineOverflow(..)
| ErrorKind::TrailingWhitespace
| ErrorKind::LicenseCheck => "error:",
ErrorKind::BadIssue(_) => "WARNING:",
}
}
fn msg_suffix(&self) -> &str {
if self.is_comment || self.is_string {
"set `error_on_unformatted = false` to suppress \
the warning against comments or string literals\n"
} else {
""
}
}
pub fn format_len(&self) -> (usize, usize) {
match self.kind {
ErrorKind::LineOverflow(found, max) => (max, found - max),
ErrorKind::TrailingWhitespace => {
let trailing_ws_len = self.line_buffer
.chars()
.rev()
.take_while(|c| c.is_whitespace())
.count();
(self.line_buffer.len() - trailing_ws_len, trailing_ws_len)
}
_ => unreachable!(),
}
}
}
pub struct FormatReport {
file_error_map: HashMap<FileName, Vec<FormattingError>>,
}
impl FormatReport {
fn new() -> FormatReport {
FormatReport {
file_error_map: HashMap::new(),
}
}
pub fn warning_count(&self) -> usize {
self.file_error_map
.iter()
.map(|(_, errors)| errors.len())
.sum()
}
pub fn has_warnings(&self) -> bool {
self.warning_count() > 0
}
pub fn print_warnings_fancy(
&self,
mut t: Box<term::Terminal<Output = io::Stderr>>,
) -> Result<(), term::Error> {
for (file, errors) in &self.file_error_map {
for error in errors {
let prefix_space_len = error.line.to_string().len();
let prefix_spaces: String = repeat(" ").take(1 + prefix_space_len).collect();
t.fg(term::color::RED)?;
t.attr(term::Attr::Bold)?;
write!(t, "{} ", error.msg_prefix())?;
t.reset()?;
t.attr(term::Attr::Bold)?;
write!(t, "{}\n", error.kind)?;
write!(t, "{}--> ", &prefix_spaces[1..])?;
t.reset()?;
write!(t, "{}:{}\n", file, error.line)?;
if !error.line_buffer.is_empty() {
let (space_len, target_len) = error.format_len();
t.attr(term::Attr::Bold)?;
write!(t, "{}|\n{} | ", prefix_spaces, error.line)?;
t.reset()?;
write!(t, "{}\n", error.line_buffer)?;
t.attr(term::Attr::Bold)?;
write!(t, "{}| ", prefix_spaces)?;
t.fg(term::color::RED)?;
write!(t, "{}\n", target_str(space_len, target_len))?;
t.reset()?;
}
let msg_suffix = error.msg_suffix();
if !msg_suffix.is_empty() {
t.attr(term::Attr::Bold)?;
write!(t, "{}= note: ", prefix_spaces)?;
t.reset()?;
write!(t, "{}\n", error.msg_suffix())?;
} else {
write!(t, "\n")?;
}
t.reset()?;
}
}
if !self.file_error_map.is_empty() {
t.attr(term::Attr::Bold)?;
write!(t, "warning: ")?;
t.reset()?;
write!(
t,
"rustfmt may have failed to format. See previous {} errors.\n\n",
self.warning_count(),
)?;
}
Ok(())
}
}
fn target_str(space_len: usize, target_len: usize) -> String {
let empty_line: String = repeat(" ").take(space_len).collect();
let overflowed: String = repeat("^").take(target_len).collect();
empty_line + &overflowed
}
impl fmt::Display for FormatReport {
fn fmt(&self, fmt: &mut fmt::Formatter) -> Result<(), fmt::Error> {
for (file, errors) in &self.file_error_map {
for error in errors {
let prefix_space_len = error.line.to_string().len();
let prefix_spaces: String = repeat(" ").take(1 + prefix_space_len).collect();
let error_line_buffer = if error.line_buffer.is_empty() {
String::from(" ")
} else {
let (space_len, target_len) = error.format_len();
format!(
"{}|\n{} | {}\n{}| {}",
prefix_spaces,
error.line,
error.line_buffer,
prefix_spaces,
target_str(space_len, target_len)
)
};
let error_info = format!("{} {}", error.msg_prefix(), error.kind);
let file_info = format!("{}--> {}:{}", &prefix_spaces[1..], file, error.line);
let msg_suffix = error.msg_suffix();
let note = if msg_suffix.is_empty() {
String::new()
} else {
format!("{}note= ", prefix_spaces)
};
write!(
fmt,
"{}\n{}\n{}\n{}{}\n",
error_info,
file_info,
error_line_buffer,
note,
error.msg_suffix()
)?;
}
}
if !self.file_error_map.is_empty() {
write!(
fmt,
"warning: rustfmt may have failed to format. See previous {} errors.\n",
self.warning_count(),
)?;
}
Ok(())
}
}
fn should_emit_verbose<F>(path: &FileName, config: &Config, f: F)
where
F: Fn(),
{
if config.verbose() && path.to_string() != STDIN {
f();
}
}
fn format_ast<F>(
krate: &ast::Crate,
parse_session: &mut ParseSess,
main_file: &FileName,
config: &Config,
mut after_file: F,
) -> Result<(FileMap, bool), io::Error>
where
F: FnMut(&FileName, &mut String, &[(usize, usize)]) -> Result<bool, io::Error>,
{
let mut result = FileMap::new();
let mut has_diff = false;
let skip_children = config.skip_children() || config.write_mode() == config::WriteMode::Plain;
for (path, module) in modules::list_files(krate, parse_session.codemap())? {
if (skip_children && path != *main_file) || config.ignore().skip_file(&path) {
continue;
}
should_emit_verbose(&path, config, || println!("Formatting {}", path));
let filemap = parse_session
.codemap()
.lookup_char_pos(module.inner.lo())
.file;
let big_snippet = filemap.src.as_ref().unwrap();
let snippet_provider = SnippetProvider::new(filemap.start_pos, big_snippet);
let mut visitor = FmtVisitor::from_codemap(parse_session, config, &snippet_provider);
if !krate.attrs.is_empty() && path == *main_file {
visitor.skip_empty_lines(filemap.end_pos);
if visitor.visit_attrs(&krate.attrs, ast::AttrStyle::Inner) {
visitor.push_rewrite(module.inner, None);
} else {
visitor.format_separate_mod(module, &*filemap);
}
} else {
visitor.last_pos = filemap.start_pos;
visitor.skip_empty_lines(filemap.end_pos);
visitor.format_separate_mod(module, &*filemap);
};
debug_assert_eq!(
visitor.line_number,
::utils::count_newlines(&format!("{}", visitor.buffer))
);
let filename = path.clone();
has_diff |= match after_file(&filename, &mut visitor.buffer, &visitor.skipped_range) {
Ok(result) => result,
Err(e) => {
let err_msg = format!("{}: {}", path, e);
return Err(io::Error::new(e.kind(), err_msg));
}
};
result.push((filename, visitor.buffer));
}
Ok((result, has_diff))
}
fn is_skipped_line(line_number: usize, skipped_range: &[(usize, usize)]) -> bool {
skipped_range
.iter()
.any(|&(lo, hi)| lo <= line_number && line_number <= hi)
}
fn should_report_error(
config: &Config,
char_kind: FullCodeCharKind,
is_string: bool,
error_kind: ErrorKind,
) -> bool {
let allow_error_report = if char_kind.is_comment() || is_string {
config.error_on_unformatted()
} else {
true
};
match error_kind {
ErrorKind::LineOverflow(..) => config.error_on_line_overflow() && allow_error_report,
ErrorKind::TrailingWhitespace => allow_error_report,
_ => true,
}
}
fn format_lines(
text: &mut String,
name: &FileName,
skipped_range: &[(usize, usize)],
config: &Config,
report: &mut FormatReport,
) {
let mut trims = vec![];
let mut last_wspace: Option<usize> = None;
let mut line_len = 0;
let mut cur_line = 1;
let mut newline_count = 0;
let mut errors = vec![];
let mut issue_seeker = BadIssueSeeker::new(config.report_todo(), config.report_fixme());
let mut line_buffer = String::with_capacity(config.max_width() * 2);
let mut is_string = false;
let mut format_line = config.file_lines().contains_line(name, cur_line);
let allow_issue_seek = !issue_seeker.is_disabled();
if let Some(ref license_template) = config.license_template {
if !license_template.is_match(text) {
errors.push(FormattingError {
line: cur_line,
kind: ErrorKind::LicenseCheck,
is_comment: false,
is_string: false,
line_buffer: String::new(),
});
}
}
for (kind, (b, c)) in CharClasses::new(text.chars().enumerate()) {
if c == '\r' {
continue;
}
if allow_issue_seek && format_line {
if let Some(issue) = issue_seeker.inspect(c) {
errors.push(FormattingError {
line: cur_line,
kind: ErrorKind::BadIssue(issue),
is_comment: false,
is_string: false,
line_buffer: String::new(),
});
}
}
if c == '\n' {
if format_line {
if let Some(..) = last_wspace {
if should_report_error(config, kind, is_string, ErrorKind::TrailingWhitespace) {
trims.push((cur_line, kind, line_buffer.clone()));
}
line_len -= 1;
}
let error_kind = ErrorKind::LineOverflow(line_len, config.max_width());
if line_len > config.max_width() && !is_skipped_line(cur_line, skipped_range)
&& should_report_error(config, kind, is_string, error_kind)
{
errors.push(FormattingError {
line: cur_line,
kind: error_kind,
is_comment: kind.is_comment(),
is_string,
line_buffer: line_buffer.clone(),
});
}
}
line_len = 0;
cur_line += 1;
format_line = config.file_lines().contains_line(name, cur_line);
newline_count += 1;
last_wspace = None;
line_buffer.clear();
is_string = false;
} else {
newline_count = 0;
line_len += if c == '\t' { config.tab_spaces() } else { 1 };
if c.is_whitespace() {
if last_wspace.is_none() {
last_wspace = Some(b);
}
} else {
last_wspace = None;
}
line_buffer.push(c);
if kind.is_string() {
is_string = true;
}
}
}
if newline_count > 1 {
debug!("track truncate: {} {}", text.len(), newline_count);
let line = text.len() - newline_count + 1;
text.truncate(line);
}
for &(l, kind, ref b) in &trims {
if !is_skipped_line(l, skipped_range) {
errors.push(FormattingError {
line: l,
kind: ErrorKind::TrailingWhitespace,
is_comment: kind.is_comment(),
is_string: kind.is_string(),
line_buffer: b.clone(),
});
}
}
report.file_error_map.insert(name.clone(), errors);
}
fn parse_input<'sess>(
input: Input,
parse_session: &'sess ParseSess,
config: &Config,
) -> Result<ast::Crate, ParseError<'sess>> {
let mut parser = match input {
Input::File(file) => parse::new_parser_from_file(parse_session, &file),
Input::Text(text) => parse::new_parser_from_source_str(
parse_session,
FileName::Custom("stdin".to_owned()),
text,
),
};
parser.cfg_mods = false;
if config.skip_children() {
parser.recurse_into_file_modules = false;
}
let mut parser = AssertUnwindSafe(parser);
let result = catch_unwind(move || parser.0.parse_crate_mod());
match result {
Ok(Ok(c)) => {
if parse_session.span_diagnostic.has_errors() {
Err(ParseError::Recovered)
} else {
Ok(c)
}
}
Ok(Err(e)) => Err(ParseError::Error(e)),
Err(_) => Err(ParseError::Panic),
}
}
enum ParseError<'sess> {
Recovered,
Error(DiagnosticBuilder<'sess>),
Panic,
}
pub fn format_snippet(snippet: &str, config: &Config) -> Option<String> {
let mut out: Vec<u8> = Vec::with_capacity(snippet.len() * 2);
let input = Input::Text(snippet.into());
let mut config = config.clone();
config.set().write_mode(config::WriteMode::Plain);
config.set().hide_parse_errors(true);
match format_input(input, &config, Some(&mut out)) {
Ok(..) if out.is_empty() && !snippet.is_empty() => None,
Ok(..) => String::from_utf8(out).ok(),
Err(..) => None,
}
}
const FN_MAIN_PREFIX: &str = "fn main() {\n";
fn enclose_in_main_block(s: &str, config: &Config) -> String {
let indent = Indent::from_width(config, config.tab_spaces());
FN_MAIN_PREFIX.to_owned() + &indent.to_string(config)
+ &s.lines()
.collect::<Vec<_>>()
.join(&indent.to_string_with_newline(config)) + "\n}"
}
pub fn format_code_block(code_snippet: &str, config: &Config) -> Option<String> {
let snippet = enclose_in_main_block(code_snippet, config);
let mut result = String::with_capacity(snippet.len());
let mut is_first = true;
let formatted = format_snippet(&snippet, config)?;
let block_len = formatted.len().checked_sub(2).unwrap_or(0);
for line in formatted[FN_MAIN_PREFIX.len()..block_len].lines() {
if !is_first {
result.push('\n');
} else {
is_first = false;
}
let trimmed_line = if line.len() > config.max_width() {
return None;
} else if line.len() > config.tab_spaces() {
let indent_str = Indent::from_width(config, config.tab_spaces()).to_string(config);
if line.starts_with(indent_str.as_ref()) {
let offset = if config.hard_tabs() {
1
} else {
config.tab_spaces()
};
&line[offset..]
} else {
line
}
} else {
line
};
result.push_str(trimmed_line);
}
Some(result)
}
pub fn format_input<T: Write>(
input: Input,
config: &Config,
out: Option<&mut T>,
) -> Result<(Summary, FileMap, FormatReport), (io::Error, Summary)> {
syntax::with_globals(|| format_input_inner(input, config, out))
}
fn format_input_inner<T: Write>(
input: Input,
config: &Config,
mut out: Option<&mut T>,
) -> Result<(Summary, FileMap, FormatReport), (io::Error, Summary)> {
let mut summary = Summary::default();
if config.disable_all_formatting() {
if let Input::Text(ref buf) = input {
if let Err(e) = io::stdout().write_all(buf.as_bytes()) {
return Err((e, summary));
}
}
return Ok((summary, FileMap::new(), FormatReport::new()));
}
let codemap = Rc::new(CodeMap::new(FilePathMapping::empty()));
let tty_handler = if config.hide_parse_errors() {
let silent_emitter = Box::new(EmitterWriter::new(
Box::new(Vec::new()),
Some(codemap.clone()),
false,
false,
));
Handler::with_emitter(true, false, silent_emitter)
} else {
let supports_color = term::stderr().map_or(false, |term| term.supports_color());
let color_cfg = if supports_color {
ColorConfig::Auto
} else {
ColorConfig::Never
};
Handler::with_tty_emitter(color_cfg, true, false, Some(codemap.clone()))
};
let mut parse_session = ParseSess::with_span_handler(tty_handler, codemap.clone());
let main_file = match input {
Input::File(ref file) => FileName::Real(file.clone()),
Input::Text(..) => FileName::Custom("stdin".to_owned()),
};
let krate = match parse_input(input, &parse_session, config) {
Ok(krate) => krate,
Err(err) => {
match err {
ParseError::Error(mut diagnostic) => diagnostic.emit(),
ParseError::Panic => {
should_emit_verbose(&main_file, config, || {
println!("The Rust parser panicked")
});
}
ParseError::Recovered => {}
}
summary.add_parsing_error();
return Ok((summary, FileMap::new(), FormatReport::new()));
}
};
summary.mark_parse_time();
let silent_emitter = Box::new(EmitterWriter::new(
Box::new(Vec::new()),
Some(codemap.clone()),
false,
false,
));
parse_session.span_diagnostic = Handler::with_emitter(true, false, silent_emitter);
let mut report = FormatReport::new();
let format_result = format_ast(
&krate,
&mut parse_session,
&main_file,
config,
|file_name, file, skipped_range| {
filemap::append_newline(file);
format_lines(file, file_name, skipped_range, config, &mut report);
if let Some(ref mut out) = out {
return filemap::write_file(file, file_name, out, config);
}
Ok(false)
},
);
summary.mark_format_time();
should_emit_verbose(&main_file, config, || {
fn duration_to_f32(d: Duration) -> f32 {
d.as_secs() as f32 + d.subsec_nanos() as f32 / 1_000_000_000f32
}
println!(
"Spent {0:.3} secs in the parsing phase, and {1:.3} secs in the formatting phase",
duration_to_f32(summary.get_parse_time().unwrap()),
duration_to_f32(summary.get_format_time().unwrap()),
)
});
match format_result {
Ok((file_map, has_diff)) => {
if report.has_warnings() {
summary.add_formatting_error();
}
if has_diff {
summary.add_diff();
}
Ok((summary, file_map, report))
}
Err(e) => Err((e, summary)),
}
}
#[derive(Debug, PartialEq, Eq)]
pub struct ModifiedChunk {
pub line_number_orig: u32,
pub lines_removed: u32,
pub lines: Vec<String>,
}
#[derive(Debug, PartialEq, Eq)]
pub struct ModifiedLines {
pub chunks: Vec<ModifiedChunk>,
}
pub struct ModifiedLinesResult {
pub summary: Summary,
pub filemap: FileMap,
pub report: FormatReport,
pub modified_lines: ModifiedLines,
}
pub fn get_modified_lines(
input: Input,
config: &Config,
) -> Result<ModifiedLinesResult, (io::Error, Summary)> {
let mut data = Vec::new();
let mut config = config.clone();
config.set().write_mode(config::WriteMode::Modified);
let (summary, filemap, report) = format_input(input, &config, Some(&mut data))?;
let mut lines = data.lines();
let mut chunks = Vec::new();
while let Some(Ok(header)) = lines.next() {
let values: Vec<_> = header
.split(' ')
.map(|s| s.parse::<u32>().unwrap())
.collect();
assert_eq!(values.len(), 3);
let line_number_orig = values[0];
let lines_removed = values[1];
let num_added = values[2];
let mut added_lines = Vec::new();
for _ in 0..num_added {
added_lines.push(lines.next().unwrap().unwrap());
}
chunks.push(ModifiedChunk {
line_number_orig,
lines_removed,
lines: added_lines,
});
}
Ok(ModifiedLinesResult {
summary,
filemap,
report,
modified_lines: ModifiedLines { chunks },
})
}
#[derive(Debug)]
pub enum Input {
File(PathBuf),
Text(String),
}
pub fn run(input: Input, config: &Config) -> Summary {
let out = &mut stdout();
output_header(out, config.write_mode()).ok();
match format_input(input, config, Some(out)) {
Ok((summary, _, report)) => {
output_footer(out, config.write_mode()).ok();
if report.has_warnings() {
match term::stderr() {
Some(ref t)
if use_colored_tty(config.color()) && t.supports_color()
&& t.supports_attr(term::Attr::Bold) =>
{
match report.print_warnings_fancy(term::stderr().unwrap()) {
Ok(..) => (),
Err(..) => panic!("Unable to write to stderr: {}", report),
}
}
_ => msg!("{}", report),
}
}
summary
}
Err((msg, mut summary)) => {
msg!("Error writing files: {}", msg);
summary.add_operational_error();
summary
}
}
}
#[cfg(test)]
mod test {
use super::{format_code_block, format_snippet, Config};
#[test]
fn test_no_panic_on_format_snippet_and_format_code_block() {
let snippet = "let";
assert!(format_snippet(snippet, &Config::default()).is_none());
assert!(format_code_block(snippet, &Config::default()).is_none());
}
fn test_format_inner<F>(formatter: F, input: &str, expected: &str) -> bool
where
F: Fn(&str, &Config) -> Option<String>,
{
let output = formatter(input, &Config::default());
output.is_some() && output.unwrap() == expected
}
#[test]
fn test_format_snippet() {
let snippet = "fn main() { println!(\"hello, world\"); }";
let expected = "fn main() {\n \
println!(\"hello, world\");\n\
}\n";
assert!(test_format_inner(format_snippet, snippet, expected));
}
#[test]
fn test_format_code_block_fail() {
#[rustfmt_skip]
let code_block = "this_line_is_100_characters_long_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx(x, y, z);";
assert!(format_code_block(code_block, &Config::default()).is_none());
}
#[test]
fn test_format_code_block() {
let code_block = "let x=3;";
let expected = "let x = 3;";
assert!(test_format_inner(format_code_block, code_block, expected));
let code_block =
"let (nested_shape, extend) = if !parent_rewrite_contains_newline && is_continuable(&parent) {
(
chain_indent(context, shape.add_offset(parent_rewrite.len())),
context.config.indent_style() == IndentStyle::Visual || is_small_parent,
)
} else if is_block_expr(context, &parent, &parent_rewrite) {
match context.config.indent_style() {
// Try to put the first child on the same line with parent's last line
IndentStyle::Block => (parent_shape.block_indent(context.config.tab_spaces()), true),
// The parent is a block, so align the rest of the chain with the closing
// brace.
IndentStyle::Visual => (parent_shape, false),
}
} else {
(
chain_indent(context, shape.add_offset(parent_rewrite.len())),
false,
)
};
";
let expected =
"let (nested_shape, extend) = if !parent_rewrite_contains_newline && is_continuable(&parent) {
(
chain_indent(context, shape.add_offset(parent_rewrite.len())),
context.config.indent_style() == IndentStyle::Visual || is_small_parent,
)
} else if is_block_expr(context, &parent, &parent_rewrite) {
match context.config.indent_style() {
// Try to put the first child on the same line with parent's last line
IndentStyle::Block => (parent_shape.block_indent(context.config.tab_spaces()), true),
// The parent is a block, so align the rest of the chain with the closing
// brace.
IndentStyle::Visual => (parent_shape, false),
}
} else {
(
chain_indent(context, shape.add_offset(parent_rewrite.len())),
false,
)
};";
assert!(test_format_inner(format_code_block, code_block, expected));
}
}