1 #![feature(rustc_private)]
2 #![deny(rust_2018_idioms)]
3 #![warn(unreachable_pub)]
4 #![recursion_limit = "256"]
5 #![allow(clippy::match_like_matches_macro)]
8 extern crate derive_new;
11 extern crate lazy_static;
15 // N.B. these crates are loaded from the sysroot, so they need extern crate.
16 extern crate rustc_ast;
17 extern crate rustc_ast_pretty;
18 extern crate rustc_builtin_macros;
19 extern crate rustc_data_structures;
20 extern crate rustc_errors;
21 extern crate rustc_expand;
22 extern crate rustc_parse;
23 extern crate rustc_session;
24 extern crate rustc_span;
26 use std::cell::RefCell;
27 use std::collections::HashMap;
29 use std::io::{self, Write};
32 use std::path::PathBuf;
36 use rustc_span::symbol;
39 use crate::comment::LineClasses;
40 use crate::emitter::Emitter;
41 use crate::formatting::{FormatErrorMap, FormattingError, ReportedErrors, SourceFile};
42 use crate::issues::Issue;
43 use crate::modules::ModuleResolutionError;
44 use crate::parse::parser::DirectoryOwnership;
45 use crate::shape::Indent;
46 use crate::utils::indent_next_line;
48 pub use crate::config::{
49 load_config, CliOptions, Color, Config, Edition, EmitMode, FileLines, FileName, NewlineStyle,
53 pub use crate::format_report_formatter::{FormatReportFormatter, FormatReportFormatterBuilder};
55 pub use crate::rustfmt_diff::{ModifiedChunk, ModifiedLines};
64 pub(crate) mod config;
68 mod format_report_formatter;
69 pub(crate) mod formatting;
78 pub(crate) mod modules;
86 pub(crate) mod rustfmt_diff;
89 pub(crate) mod source_file;
90 pub(crate) mod source_map;
98 pub(crate) mod visitor;
100 /// The various errors that can occur during formatting. Note that not all of
101 /// these can currently be propagated to clients.
102 #[derive(Error, Debug)]
104 /// Line has exceeded character limit (found, maximum).
106 "line formatted, but exceeded maximum width \
107 (maximum: {1} (see `max_width` option), found: {0})"
109 LineOverflow(usize, usize),
110 /// Line ends in whitespace.
111 #[error("left behind trailing whitespace")]
113 /// TODO or FIXME item without an issue number.
114 #[error("found {0}")]
116 /// License check has failed.
117 #[error("license check failed")]
119 /// Used deprecated skip attribute.
120 #[error("`rustfmt_skip` is deprecated; use `rustfmt::skip`")]
122 /// Used a rustfmt:: attribute other than skip or skip::macros.
123 #[error("invalid attribute")]
125 /// An io error during reading or writing.
126 #[error("io error: {0}")]
128 /// Error during module resolution.
130 ModuleResolutionError(#[from] ModuleResolutionError),
131 /// Parse error occurred when parsing the input.
132 #[error("parse error")]
134 /// The user mandated a version and the current version of Rustfmt does not
135 /// satisfy that requirement.
136 #[error("version mismatch")]
138 /// If we had formatted the given node, then we would have lost a comment.
139 #[error("not formatted because a comment would be lost")]
141 /// Invalid glob pattern in `ignore` configuration option.
142 #[error("Invalid glob pattern found in ignore list: {0}")]
143 InvalidGlobPattern(ignore::Error),
147 fn is_comment(&self) -> bool {
148 matches!(self, ErrorKind::LostComment)
152 impl From<io::Error> for ErrorKind {
153 fn from(e: io::Error) -> ErrorKind {
154 ErrorKind::IoError(e)
158 /// Result of formatting a snippet of code along with ranges of lines that didn't get formatted,
159 /// i.e., that got returned as they were originally.
161 struct FormattedSnippet {
163 non_formatted_ranges: Vec<(usize, usize)>,
166 impl FormattedSnippet {
167 /// In case the snippet needed to be wrapped in a function, this shifts down the ranges of
168 /// non-formatted code.
169 fn unwrap_code_block(&mut self) {
170 self.non_formatted_ranges
172 .for_each(|(low, high)| {
178 /// Returns `true` if the line n did not get formatted.
179 fn is_line_non_formatted(&self, n: usize) -> bool {
180 self.non_formatted_ranges
182 .any(|(low, high)| *low <= n && n <= *high)
186 /// Reports on any issues that occurred during a run of Rustfmt.
188 /// Can be reported to the user using the `Display` impl on [`FormatReportFormatter`].
190 pub struct FormatReport {
191 // Maps stringified file paths to their associated formatting errors.
192 internal: Rc<RefCell<(FormatErrorMap, ReportedErrors)>>,
193 non_formatted_ranges: Vec<(usize, usize)>,
197 fn new() -> FormatReport {
199 internal: Rc::new(RefCell::new((HashMap::new(), ReportedErrors::default()))),
200 non_formatted_ranges: Vec::new(),
204 fn add_non_formatted_ranges(&mut self, mut ranges: Vec<(usize, usize)>) {
205 self.non_formatted_ranges.append(&mut ranges);
208 fn append(&self, f: FileName, mut v: Vec<FormattingError>) {
209 self.track_errors(&v);
214 .and_modify(|fe| fe.append(&mut v))
218 fn track_errors(&self, new_errors: &[FormattingError]) {
219 let errs = &mut self.internal.borrow_mut().1;
220 if !new_errors.is_empty() {
221 errs.has_formatting_errors = true;
223 if errs.has_operational_errors && errs.has_check_errors && errs.has_unformatted_code_errors
227 for err in new_errors {
229 ErrorKind::LineOverflow(..) => {
230 errs.has_operational_errors = true;
232 ErrorKind::TrailingWhitespace => {
233 errs.has_operational_errors = true;
234 errs.has_unformatted_code_errors = true;
236 ErrorKind::LostComment => {
237 errs.has_unformatted_code_errors = true;
239 ErrorKind::BadIssue(_)
240 | ErrorKind::LicenseCheck
241 | ErrorKind::DeprecatedAttr
243 | ErrorKind::VersionMismatch => {
244 errs.has_check_errors = true;
251 fn add_diff(&mut self) {
252 self.internal.borrow_mut().1.has_diff = true;
255 fn add_macro_format_failure(&mut self) {
256 self.internal.borrow_mut().1.has_macro_format_failure = true;
259 fn add_parsing_error(&mut self) {
260 self.internal.borrow_mut().1.has_parsing_errors = true;
263 fn warning_count(&self) -> usize {
268 .map(|(_, errors)| errors.len())
272 /// Whether any warnings or errors are present in the report.
273 pub fn has_warnings(&self) -> bool {
274 self.internal.borrow().1.has_formatting_errors
277 /// Print the report to a terminal using colours and potentially other
279 #[deprecated(note = "Use FormatReportFormatter with colors enabled instead")]
282 mut t: Box<dyn term::Terminal<Output = io::Stderr>>,
283 ) -> Result<(), term::Error> {
287 FormatReportFormatterBuilder::new(self)
295 /// Deprecated - Use FormatReportFormatter instead
296 // https://github.com/rust-lang/rust/issues/78625
297 // https://github.com/rust-lang/rust/issues/39935
298 impl fmt::Display for FormatReport {
299 // Prints all the formatting errors.
300 fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> Result<(), fmt::Error> {
301 write!(fmt, "{}", FormatReportFormatterBuilder::new(self).build())?;
306 /// Format the given snippet. The snippet is expected to be *complete* code.
307 /// When we cannot parse the given snippet, this function returns `None`.
308 fn format_snippet(snippet: &str, config: &Config, is_macro_def: bool) -> Option<FormattedSnippet> {
309 let mut config = config.clone();
310 panic::catch_unwind(|| {
311 let mut out: Vec<u8> = Vec::with_capacity(snippet.len() * 2);
312 config.set().emit_mode(config::EmitMode::Stdout);
313 config.set().verbose(Verbosity::Quiet);
314 config.set().hide_parse_errors(true);
316 config.set().error_on_unformatted(true);
319 let (formatting_error, result) = {
320 let input = Input::Text(snippet.into());
321 let mut session = Session::new(config, Some(&mut out));
322 let result = session.format_input_inner(input, is_macro_def);
324 session.errors.has_macro_format_failure
325 || session.out.as_ref().unwrap().is_empty() && !snippet.is_empty()
327 || (is_macro_def && session.has_unformatted_code_errors()),
331 if formatting_error {
334 String::from_utf8(out).ok().map(|snippet| FormattedSnippet {
336 non_formatted_ranges: result.unwrap().non_formatted_ranges,
340 // Discard panics encountered while formatting the snippet
341 // The ? operator is needed to remove the extra Option
345 /// Format the given code block. Mainly targeted for code block in comment.
346 /// The code block may be incomplete (i.e., parser may be unable to parse it).
347 /// To avoid panic in parser, we wrap the code block with a dummy function.
348 /// The returned code block does **not** end with newline.
349 fn format_code_block(
353 ) -> Option<FormattedSnippet> {
354 const FN_MAIN_PREFIX: &str = "fn main() {\n";
356 fn enclose_in_main_block(s: &str, config: &Config) -> String {
357 let indent = Indent::from_width(config, config.tab_spaces());
358 let mut result = String::with_capacity(s.len() * 2);
359 result.push_str(FN_MAIN_PREFIX);
360 let mut need_indent = true;
361 for (kind, line) in LineClasses::new(s) {
363 result.push_str(&indent.to_string(config));
365 result.push_str(&line);
367 need_indent = indent_next_line(kind, &line, config);
373 // Wrap the given code block with `fn main()` if it does not have one.
374 let snippet = enclose_in_main_block(code_snippet, config);
375 let mut result = String::with_capacity(snippet.len());
376 let mut is_first = true;
378 // While formatting the code, ignore the config's newline style setting and always use "\n"
379 // instead of "\r\n" for the newline characters. This is ok because the output here is
380 // not directly outputted by rustfmt command, but used by the comment formatter's input.
381 // We have output-file-wide "\n" ==> "\r\n" conversion process after here if it's necessary.
382 let mut config_with_unix_newline = config.clone();
383 config_with_unix_newline
385 .newline_style(NewlineStyle::Unix);
386 let mut formatted = format_snippet(&snippet, &config_with_unix_newline, is_macro_def)?;
387 // Remove wrapping main block
388 formatted.unwrap_code_block();
390 // Trim "fn main() {" on the first line and "}" on the last line,
391 // then unindent the whole code block.
392 let block_len = formatted
395 .unwrap_or_else(|| formatted.snippet.len());
396 let mut is_indented = true;
397 let indent_str = Indent::from_width(config, config.tab_spaces()).to_string(config);
398 for (kind, ref line) in LineClasses::new(&formatted.snippet[FN_MAIN_PREFIX.len()..block_len]) {
404 let trimmed_line = if !is_indented {
406 } else if line.len() > config.max_width() {
407 // If there are lines that are larger than max width, we cannot tell
408 // whether we have succeeded but have some comments or strings that
409 // are too long, or we have failed to format code block. We will be
410 // conservative and just return `None` in this case.
412 } else if line.len() > indent_str.len() {
413 // Make sure that the line has leading whitespaces.
414 if line.starts_with(indent_str.as_ref()) {
415 let offset = if config.hard_tabs() {
427 result.push_str(trimmed_line);
428 is_indented = indent_next_line(kind, line, config);
430 Some(FormattedSnippet {
432 non_formatted_ranges: formatted.non_formatted_ranges,
436 /// A session is a run of rustfmt across a single or multiple inputs.
437 pub struct Session<'b, T: Write> {
439 pub out: Option<&'b mut T>,
440 pub(crate) errors: ReportedErrors,
441 source_file: SourceFile,
442 emitter: Box<dyn Emitter + 'b>,
445 impl<'b, T: Write + 'b> Session<'b, T> {
446 pub fn new(config: Config, mut out: Option<&'b mut T>) -> Session<'b, T> {
447 let emitter = create_emitter(&config);
449 if let Some(ref mut out) = out {
450 let _ = emitter.emit_header(out);
457 errors: ReportedErrors::default(),
458 source_file: SourceFile::new(),
462 /// The main entry point for Rustfmt. Formats the given input according to the
463 /// given config. `out` is only necessary if required by the configuration.
464 pub fn format(&mut self, input: Input) -> Result<FormatReport, ErrorKind> {
465 self.format_input_inner(input, false)
468 pub fn override_config<F, U>(&mut self, mut config: Config, f: F) -> U
470 F: FnOnce(&mut Session<'b, T>) -> U,
472 mem::swap(&mut config, &mut self.config);
473 let result = f(self);
474 mem::swap(&mut config, &mut self.config);
478 pub fn add_operational_error(&mut self) {
479 self.errors.has_operational_errors = true;
482 pub fn has_operational_errors(&self) -> bool {
483 self.errors.has_operational_errors
486 pub fn has_parsing_errors(&self) -> bool {
487 self.errors.has_parsing_errors
490 pub fn has_formatting_errors(&self) -> bool {
491 self.errors.has_formatting_errors
494 pub fn has_check_errors(&self) -> bool {
495 self.errors.has_check_errors
498 pub fn has_diff(&self) -> bool {
502 pub fn has_unformatted_code_errors(&self) -> bool {
503 self.errors.has_unformatted_code_errors
506 pub fn has_no_errors(&self) -> bool {
507 !(self.has_operational_errors()
508 || self.has_parsing_errors()
509 || self.has_formatting_errors()
510 || self.has_check_errors()
512 || self.has_unformatted_code_errors()
513 || self.errors.has_macro_format_failure)
517 pub(crate) fn create_emitter<'a>(config: &Config) -> Box<dyn Emitter + 'a> {
518 match config.emit_mode() {
519 EmitMode::Files if config.make_backup() => {
520 Box::new(emitter::FilesWithBackupEmitter::default())
522 EmitMode::Files => Box::new(emitter::FilesEmitter::new(
523 config.print_misformatted_file_names(),
525 EmitMode::Stdout | EmitMode::Coverage => {
526 Box::new(emitter::StdoutEmitter::new(config.verbose()))
528 EmitMode::Json => Box::new(emitter::JsonEmitter::default()),
529 EmitMode::ModifiedLines => Box::new(emitter::ModifiedLinesEmitter::default()),
530 EmitMode::Checkstyle => Box::new(emitter::CheckstyleEmitter::default()),
531 EmitMode::Diff => Box::new(emitter::DiffEmitter::new(config.clone())),
535 impl<'b, T: Write + 'b> Drop for Session<'b, T> {
537 if let Some(ref mut out) = self.out {
538 let _ = self.emitter.emit_footer(out);
550 fn file_name(&self) -> FileName {
552 Input::File(ref file) => FileName::Real(file.clone()),
553 Input::Text(..) => FileName::Stdin,
557 fn to_directory_ownership(&self) -> Option<DirectoryOwnership> {
559 Input::File(ref file) => {
560 // If there exists a directory with the same name as an input,
561 // then the input should be parsed as a sub module.
562 let file_stem = file.file_stem()?;
563 if file.parent()?.to_path_buf().join(file_stem).is_dir() {
564 Some(DirectoryOwnership::Owned {
565 relative: file_stem.to_str().map(symbol::Ident::from_str),
581 fn test_no_panic_on_format_snippet_and_format_code_block() {
582 // `format_snippet()` and `format_code_block()` should not panic
583 // even when we cannot parse the given snippet.
585 assert!(format_snippet(snippet, &Config::default(), false).is_none());
586 assert!(format_code_block(snippet, &Config::default(), false).is_none());
589 fn test_format_inner<F>(formatter: F, input: &str, expected: &str) -> bool
591 F: Fn(&str, &Config, bool) -> Option<FormattedSnippet>,
593 let output = formatter(input, &Config::default(), false);
594 output.is_some() && output.unwrap().snippet == expected
598 fn test_format_snippet() {
599 let snippet = "fn main() { println!(\"hello, world\"); }";
601 let expected = "fn main() {\n \
602 println!(\"hello, world\");\n\
605 let expected = "fn main() {\r\n \
606 println!(\"hello, world\");\r\n\
608 assert!(test_format_inner(format_snippet, snippet, expected));
612 fn test_format_code_block_fail() {
614 let code_block = "this_line_is_100_characters_long_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx(x, y, z);";
615 assert!(format_code_block(code_block, &Config::default(), false).is_none());
619 fn test_format_code_block() {
621 let code_block = "let x=3;";
622 let expected = "let x = 3;";
623 assert!(test_format_inner(format_code_block, code_block, expected));
625 // more complex code block, taken from chains.rs.
627 "let (nested_shape, extend) = if !parent_rewrite_contains_newline && is_continuable(&parent) {
629 chain_indent(context, shape.add_offset(parent_rewrite.len())),
630 context.config.indent_style() == IndentStyle::Visual || is_small_parent,
632 } else if is_block_expr(context, &parent, &parent_rewrite) {
633 match context.config.indent_style() {
634 // Try to put the first child on the same line with parent's last line
635 IndentStyle::Block => (parent_shape.block_indent(context.config.tab_spaces()), true),
636 // The parent is a block, so align the rest of the chain with the closing
638 IndentStyle::Visual => (parent_shape, false),
642 chain_indent(context, shape.add_offset(parent_rewrite.len())),
648 "let (nested_shape, extend) = if !parent_rewrite_contains_newline && is_continuable(&parent) {
650 chain_indent(context, shape.add_offset(parent_rewrite.len())),
651 context.config.indent_style() == IndentStyle::Visual || is_small_parent,
653 } else if is_block_expr(context, &parent, &parent_rewrite) {
654 match context.config.indent_style() {
655 // Try to put the first child on the same line with parent's last line
656 IndentStyle::Block => (parent_shape.block_indent(context.config.tab_spaces()), true),
657 // The parent is a block, so align the rest of the chain with the closing
659 IndentStyle::Visual => (parent_shape, false),
663 chain_indent(context, shape.add_offset(parent_rewrite.len())),
667 assert!(test_format_inner(format_code_block, code_block, expected));