1 #![deny(rust_2018_idioms)]
2 #![warn(unreachable_pub)]
5 extern crate derive_new;
7 extern crate lazy_static;
11 use std::cell::RefCell;
12 use std::collections::HashMap;
14 use std::io::{self, Write};
17 use std::path::PathBuf;
23 use rustc_span::symbol;
25 use crate::comment::LineClasses;
26 use crate::emitter::Emitter;
27 use crate::formatting::{FormatErrorMap, FormattingError, ReportedErrors, SourceFile};
28 use crate::issues::Issue;
29 use crate::shape::Indent;
30 use crate::syntux::parser::DirectoryOwnership;
31 use crate::utils::indent_next_line;
33 pub use crate::config::{
34 load_config, CliOptions, Color, Config, Edition, EmitMode, FileLines, FileName, NewlineStyle,
38 pub use crate::format_report_formatter::{FormatReportFormatter, FormatReportFormatterBuilder};
40 pub use crate::rustfmt_diff::{ModifiedChunk, ModifiedLines};
49 pub(crate) mod config;
53 mod format_report_formatter;
54 pub(crate) mod formatting;
63 pub(crate) mod modules;
70 pub(crate) mod rustfmt_diff;
73 pub(crate) mod source_file;
74 pub(crate) mod source_map;
83 pub(crate) mod visitor;
85 /// The various errors that can occur during formatting. Note that not all of
86 /// these can currently be propagated to clients.
87 #[derive(Fail, Debug)]
89 /// Line has exceeded character limit (found, maximum).
91 display = "line formatted, but exceeded maximum width \
92 (maximum: {} (see `max_width` option), found: {})",
95 LineOverflow(usize, usize),
96 /// Line ends in whitespace.
97 #[fail(display = "left behind trailing whitespace")]
99 /// TODO or FIXME item without an issue number.
100 #[fail(display = "found {}", _0)]
102 /// License check has failed.
103 #[fail(display = "license check failed")]
105 /// Used deprecated skip attribute.
106 #[fail(display = "`rustfmt_skip` is deprecated; use `rustfmt::skip`")]
108 /// Used a rustfmt:: attribute other than skip or skip::macros.
109 #[fail(display = "invalid attribute")]
111 /// An io error during reading or writing.
112 #[fail(display = "io error: {}", _0)]
114 /// Parse error occurred when parsing the input.
115 #[fail(display = "parse error")]
117 /// The user mandated a version and the current version of Rustfmt does not
118 /// satisfy that requirement.
119 #[fail(display = "version mismatch")]
121 /// If we had formatted the given node, then we would have lost a comment.
122 #[fail(display = "not formatted because a comment would be lost")]
124 /// Invalid glob pattern in `ignore` configuration option.
125 #[fail(display = "Invalid glob pattern found in ignore list: {}", _0)]
126 InvalidGlobPattern(ignore::Error),
130 fn is_comment(&self) -> bool {
132 ErrorKind::LostComment => true,
138 impl From<io::Error> for ErrorKind {
139 fn from(e: io::Error) -> ErrorKind {
140 ErrorKind::IoError(e)
144 /// Result of formatting a snippet of code along with ranges of lines that didn't get formatted,
145 /// i.e., that got returned as they were originally.
147 struct FormattedSnippet {
149 non_formatted_ranges: Vec<(usize, usize)>,
152 impl FormattedSnippet {
153 /// In case the snippet needed to be wrapped in a function, this shifts down the ranges of
154 /// non-formatted code.
155 fn unwrap_code_block(&mut self) {
156 self.non_formatted_ranges
158 .for_each(|(low, high)| {
164 /// Returns `true` if the line n did not get formatted.
165 fn is_line_non_formatted(&self, n: usize) -> bool {
166 self.non_formatted_ranges
168 .any(|(low, high)| *low <= n && n <= *high)
172 /// Reports on any issues that occurred during a run of Rustfmt.
174 /// Can be reported to the user using the `Display` impl on [`FormatReportFormatter`].
176 pub struct FormatReport {
177 // Maps stringified file paths to their associated formatting errors.
178 internal: Rc<RefCell<(FormatErrorMap, ReportedErrors)>>,
179 non_formatted_ranges: Vec<(usize, usize)>,
183 fn new() -> FormatReport {
185 internal: Rc::new(RefCell::new((HashMap::new(), ReportedErrors::default()))),
186 non_formatted_ranges: Vec::new(),
190 fn add_non_formatted_ranges(&mut self, mut ranges: Vec<(usize, usize)>) {
191 self.non_formatted_ranges.append(&mut ranges);
194 fn append(&self, f: FileName, mut v: Vec<FormattingError>) {
195 self.track_errors(&v);
200 .and_modify(|fe| fe.append(&mut v))
204 fn track_errors(&self, new_errors: &[FormattingError]) {
205 let errs = &mut self.internal.borrow_mut().1;
206 if !new_errors.is_empty() {
207 errs.has_formatting_errors = true;
209 if errs.has_operational_errors && errs.has_check_errors {
212 for err in new_errors {
214 ErrorKind::LineOverflow(..) | ErrorKind::TrailingWhitespace => {
215 errs.has_operational_errors = true;
217 ErrorKind::BadIssue(_)
218 | ErrorKind::LicenseCheck
219 | ErrorKind::DeprecatedAttr
221 | ErrorKind::VersionMismatch => {
222 errs.has_check_errors = true;
229 fn add_diff(&mut self) {
230 self.internal.borrow_mut().1.has_diff = true;
233 fn add_macro_format_failure(&mut self) {
234 self.internal.borrow_mut().1.has_macro_format_failure = true;
237 fn add_parsing_error(&mut self) {
238 self.internal.borrow_mut().1.has_parsing_errors = true;
241 fn warning_count(&self) -> usize {
246 .map(|(_, errors)| errors.len())
250 /// Whether any warnings or errors are present in the report.
251 pub fn has_warnings(&self) -> bool {
252 self.internal.borrow().1.has_formatting_errors
255 /// Print the report to a terminal using colours and potentially other
257 #[deprecated(note = "Use FormatReportFormatter with colors enabled instead")]
260 mut t: Box<dyn term::Terminal<Output = io::Stderr>>,
261 ) -> Result<(), term::Error> {
265 FormatReportFormatterBuilder::new(&self)
273 #[deprecated(note = "Use FormatReportFormatter instead")]
274 impl fmt::Display for FormatReport {
275 // Prints all the formatting errors.
276 fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> Result<(), fmt::Error> {
277 write!(fmt, "{}", FormatReportFormatterBuilder::new(&self).build())?;
282 /// Format the given snippet. The snippet is expected to be *complete* code.
283 /// When we cannot parse the given snippet, this function returns `None`.
284 fn format_snippet(snippet: &str, config: &Config) -> Option<FormattedSnippet> {
285 let mut config = config.clone();
286 panic::catch_unwind(|| {
287 let mut out: Vec<u8> = Vec::with_capacity(snippet.len() * 2);
288 config.set().emit_mode(config::EmitMode::Stdout);
289 config.set().verbose(Verbosity::Quiet);
290 config.set().hide_parse_errors(true);
292 let (formatting_error, result) = {
293 let input = Input::Text(snippet.into());
294 let mut session = Session::new(config, Some(&mut out));
295 let result = session.format(input);
297 session.errors.has_macro_format_failure
298 || session.out.as_ref().unwrap().is_empty() && !snippet.is_empty()
303 if formatting_error {
306 String::from_utf8(out).ok().map(|snippet| FormattedSnippet {
308 non_formatted_ranges: result.unwrap().non_formatted_ranges,
312 // Discard panics encountered while formatting the snippet
313 // The ? operator is needed to remove the extra Option
317 /// Format the given code block. Mainly targeted for code block in comment.
318 /// The code block may be incomplete (i.e., parser may be unable to parse it).
319 /// To avoid panic in parser, we wrap the code block with a dummy function.
320 /// The returned code block does **not** end with newline.
321 fn format_code_block(code_snippet: &str, config: &Config) -> Option<FormattedSnippet> {
322 const FN_MAIN_PREFIX: &str = "fn main() {\n";
324 fn enclose_in_main_block(s: &str, config: &Config) -> String {
325 let indent = Indent::from_width(config, config.tab_spaces());
326 let mut result = String::with_capacity(s.len() * 2);
327 result.push_str(FN_MAIN_PREFIX);
328 let mut need_indent = true;
329 for (kind, line) in LineClasses::new(s) {
331 result.push_str(&indent.to_string(config));
333 result.push_str(&line);
335 need_indent = indent_next_line(kind, &line, config);
341 // Wrap the given code block with `fn main()` if it does not have one.
342 let snippet = enclose_in_main_block(code_snippet, config);
343 let mut result = String::with_capacity(snippet.len());
344 let mut is_first = true;
346 // While formatting the code, ignore the config's newline style setting and always use "\n"
347 // instead of "\r\n" for the newline characters. This is ok because the output here is
348 // not directly outputted by rustfmt command, but used by the comment formatter's input.
349 // We have output-file-wide "\n" ==> "\r\n" conversion process after here if it's necessary.
350 let mut config_with_unix_newline = config.clone();
351 config_with_unix_newline
353 .newline_style(NewlineStyle::Unix);
354 let mut formatted = format_snippet(&snippet, &config_with_unix_newline)?;
355 // Remove wrapping main block
356 formatted.unwrap_code_block();
358 // Trim "fn main() {" on the first line and "}" on the last line,
359 // then unindent the whole code block.
360 let block_len = formatted
363 .unwrap_or_else(|| formatted.snippet.len());
364 let mut is_indented = true;
365 for (kind, ref line) in LineClasses::new(&formatted.snippet[FN_MAIN_PREFIX.len()..block_len]) {
371 let trimmed_line = if !is_indented {
373 } else if line.len() > config.max_width() {
374 // If there are lines that are larger than max width, we cannot tell
375 // whether we have succeeded but have some comments or strings that
376 // are too long, or we have failed to format code block. We will be
377 // conservative and just return `None` in this case.
379 } else if line.len() > config.tab_spaces() {
380 // Make sure that the line has leading whitespaces.
381 let indent_str = Indent::from_width(config, config.tab_spaces()).to_string(config);
382 if line.starts_with(indent_str.as_ref()) {
383 let offset = if config.hard_tabs() {
395 result.push_str(trimmed_line);
396 is_indented = indent_next_line(kind, line, config);
398 Some(FormattedSnippet {
400 non_formatted_ranges: formatted.non_formatted_ranges,
404 /// A session is a run of rustfmt across a single or multiple inputs.
405 pub struct Session<'b, T: Write> {
407 pub out: Option<&'b mut T>,
408 pub(crate) errors: ReportedErrors,
409 source_file: SourceFile,
410 emitter: Box<dyn Emitter + 'b>,
413 impl<'b, T: Write + 'b> Session<'b, T> {
414 pub fn new(config: Config, mut out: Option<&'b mut T>) -> Session<'b, T> {
415 let emitter = create_emitter(&config);
417 if let Some(ref mut out) = out {
418 let _ = emitter.emit_header(out);
425 errors: ReportedErrors::default(),
426 source_file: SourceFile::new(),
430 /// The main entry point for Rustfmt. Formats the given input according to the
431 /// given config. `out` is only necessary if required by the configuration.
432 pub fn format(&mut self, input: Input) -> Result<FormatReport, ErrorKind> {
433 self.format_input_inner(input)
436 pub fn override_config<F, U>(&mut self, mut config: Config, f: F) -> U
438 F: FnOnce(&mut Session<'b, T>) -> U,
440 mem::swap(&mut config, &mut self.config);
441 let result = f(self);
442 mem::swap(&mut config, &mut self.config);
446 pub fn add_operational_error(&mut self) {
447 self.errors.has_operational_errors = true;
450 pub fn has_operational_errors(&self) -> bool {
451 self.errors.has_operational_errors
454 pub fn has_parsing_errors(&self) -> bool {
455 self.errors.has_parsing_errors
458 pub fn has_formatting_errors(&self) -> bool {
459 self.errors.has_formatting_errors
462 pub fn has_check_errors(&self) -> bool {
463 self.errors.has_check_errors
466 pub fn has_diff(&self) -> bool {
470 pub fn has_no_errors(&self) -> bool {
471 !(self.has_operational_errors()
472 || self.has_parsing_errors()
473 || self.has_formatting_errors()
474 || self.has_check_errors()
476 || self.errors.has_macro_format_failure
480 pub(crate) fn create_emitter<'a>(config: &Config) -> Box<dyn Emitter + 'a> {
481 match config.emit_mode() {
482 EmitMode::Files if config.make_backup() => {
483 Box::new(emitter::FilesWithBackupEmitter::default())
485 EmitMode::Files => Box::new(emitter::FilesEmitter::new(
486 config.print_misformatted_file_names(),
488 EmitMode::Stdout | EmitMode::Coverage => {
489 Box::new(emitter::StdoutEmitter::new(config.verbose()))
491 EmitMode::Json => Box::new(emitter::JsonEmitter::default()),
492 EmitMode::ModifiedLines => Box::new(emitter::ModifiedLinesEmitter::default()),
493 EmitMode::Checkstyle => Box::new(emitter::CheckstyleEmitter::default()),
494 EmitMode::Diff => Box::new(emitter::DiffEmitter::new(config.clone())),
498 impl<'b, T: Write + 'b> Drop for Session<'b, T> {
500 if let Some(ref mut out) = self.out {
501 let _ = self.emitter.emit_footer(out);
513 fn file_name(&self) -> FileName {
515 Input::File(ref file) => FileName::Real(file.clone()),
516 Input::Text(..) => FileName::Stdin,
520 fn to_directory_ownership(&self) -> Option<DirectoryOwnership> {
522 Input::File(ref file) => {
523 // If there exists a directory with the same name as an input,
524 // then the input should be parsed as a sub module.
525 let file_stem = file.file_stem()?;
526 if file.parent()?.to_path_buf().join(file_stem).is_dir() {
527 Some(DirectoryOwnership::Owned {
528 relative: file_stem.to_str().map(symbol::Ident::from_str),
544 fn test_no_panic_on_format_snippet_and_format_code_block() {
545 // `format_snippet()` and `format_code_block()` should not panic
546 // even when we cannot parse the given snippet.
548 assert!(format_snippet(snippet, &Config::default()).is_none());
549 assert!(format_code_block(snippet, &Config::default()).is_none());
552 fn test_format_inner<F>(formatter: F, input: &str, expected: &str) -> bool
554 F: Fn(&str, &Config) -> Option<FormattedSnippet>,
556 let output = formatter(input, &Config::default());
557 output.is_some() && output.unwrap().snippet == expected
561 fn test_format_snippet() {
562 let snippet = "fn main() { println!(\"hello, world\"); }";
564 let expected = "fn main() {\n \
565 println!(\"hello, world\");\n\
568 let expected = "fn main() {\r\n \
569 println!(\"hello, world\");\r\n\
571 assert!(test_format_inner(format_snippet, snippet, expected));
575 fn test_format_code_block_fail() {
577 let code_block = "this_line_is_100_characters_long_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx(x, y, z);";
578 assert!(format_code_block(code_block, &Config::default()).is_none());
582 fn test_format_code_block() {
584 let code_block = "let x=3;";
585 let expected = "let x = 3;";
586 assert!(test_format_inner(format_code_block, code_block, expected));
588 // more complex code block, taken from chains.rs.
590 "let (nested_shape, extend) = if !parent_rewrite_contains_newline && is_continuable(&parent) {
592 chain_indent(context, shape.add_offset(parent_rewrite.len())),
593 context.config.indent_style() == IndentStyle::Visual || is_small_parent,
595 } else if is_block_expr(context, &parent, &parent_rewrite) {
596 match context.config.indent_style() {
597 // Try to put the first child on the same line with parent's last line
598 IndentStyle::Block => (parent_shape.block_indent(context.config.tab_spaces()), true),
599 // The parent is a block, so align the rest of the chain with the closing
601 IndentStyle::Visual => (parent_shape, false),
605 chain_indent(context, shape.add_offset(parent_rewrite.len())),
611 "let (nested_shape, extend) = if !parent_rewrite_contains_newline && is_continuable(&parent) {
613 chain_indent(context, shape.add_offset(parent_rewrite.len())),
614 context.config.indent_style() == IndentStyle::Visual || is_small_parent,
616 } else if is_block_expr(context, &parent, &parent_rewrite) {
617 match context.config.indent_style() {
618 // Try to put the first child on the same line with parent's last line
619 IndentStyle::Block => (parent_shape.block_indent(context.config.tab_spaces()), true),
620 // The parent is a block, so align the rest of the chain with the closing
622 IndentStyle::Visual => (parent_shape, false),
626 chain_indent(context, shape.add_offset(parent_rewrite.len())),
630 assert!(test_format_inner(format_code_block, code_block, expected));