1 #![deny(rust_2018_idioms)]
2 #![warn(unreachable_pub)]
5 extern crate derive_new;
8 extern crate lazy_static;
12 use std::cell::RefCell;
13 use std::collections::HashMap;
15 use std::io::{self, Write};
18 use std::path::PathBuf;
23 use syntax::{ast, parse::DirectoryOwnership};
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::utils::indent_next_line;
32 pub use crate::config::{
33 load_config, CliOptions, Color, Config, Edition, EmitMode, FileLines, FileName, NewlineStyle,
37 pub use crate::format_report_formatter::{FormatReportFormatter, FormatReportFormatterBuilder};
39 pub use crate::rustfmt_diff::{ModifiedChunk, ModifiedLines};
51 pub(crate) mod config;
54 mod format_report_formatter;
55 pub(crate) mod formatting;
64 pub(crate) mod modules;
70 pub(crate) mod rustfmt_diff;
72 pub(crate) mod source_file;
73 pub(crate) mod source_map;
80 pub(crate) mod visitor;
82 /// The various errors that can occur during formatting. Note that not all of
83 /// these can currently be propagated to clients.
84 #[derive(Fail, Debug)]
86 /// Line has exceeded character limit (found, maximum).
88 display = "line formatted, but exceeded maximum width \
89 (maximum: {} (see `max_width` option), found: {})",
92 LineOverflow(usize, usize),
93 /// Line ends in whitespace.
94 #[fail(display = "left behind trailing whitespace")]
96 /// TODO or FIXME item without an issue number.
97 #[fail(display = "found {}", _0)]
99 /// License check has failed.
100 #[fail(display = "license check failed")]
102 /// Used deprecated skip attribute.
103 #[fail(display = "`rustfmt_skip` is deprecated; use `rustfmt::skip`")]
105 /// Used a rustfmt:: attribute other than skip or skip::macros.
106 #[fail(display = "invalid attribute")]
108 /// An io error during reading or writing.
109 #[fail(display = "io error: {}", _0)]
111 /// Parse error occurred when parsing the input.
112 #[fail(display = "parse error")]
114 /// The user mandated a version and the current version of Rustfmt does not
115 /// satisfy that requirement.
116 #[fail(display = "version mismatch")]
118 /// If we had formatted the given node, then we would have lost a comment.
119 #[fail(display = "not formatted because a comment would be lost")]
121 /// Invalid glob pattern in `ignore` configuration option.
122 #[fail(display = "Invalid glob pattern found in ignore list: {}", _0)]
123 InvalidGlobPattern(ignore::Error),
127 fn is_comment(&self) -> bool {
129 ErrorKind::LostComment => true,
135 impl From<io::Error> for ErrorKind {
136 fn from(e: io::Error) -> ErrorKind {
137 ErrorKind::IoError(e)
141 /// Result of formatting a snippet of code along with ranges of lines that didn't get formatted,
142 /// i.e., that got returned as they were originally.
144 struct FormattedSnippet {
146 non_formatted_ranges: Vec<(usize, usize)>,
149 impl FormattedSnippet {
150 /// In case the snippet needed to be wrapped in a function, this shifts down the ranges of
151 /// non-formatted code.
152 fn unwrap_code_block(&mut self) {
153 self.non_formatted_ranges
155 .for_each(|(low, high)| {
161 /// Returns `true` if the line n did not get formatted.
162 fn is_line_non_formatted(&self, n: usize) -> bool {
163 self.non_formatted_ranges
165 .any(|(low, high)| *low <= n && n <= *high)
169 /// Reports on any issues that occurred during a run of Rustfmt.
171 /// Can be reported to the user using the `Display` impl on [`FormatReportFormatter`].
173 pub struct FormatReport {
174 // Maps stringified file paths to their associated formatting errors.
175 internal: Rc<RefCell<(FormatErrorMap, ReportedErrors)>>,
176 non_formatted_ranges: Vec<(usize, usize)>,
180 fn new() -> FormatReport {
182 internal: Rc::new(RefCell::new((HashMap::new(), ReportedErrors::default()))),
183 non_formatted_ranges: Vec::new(),
187 fn add_non_formatted_ranges(&mut self, mut ranges: Vec<(usize, usize)>) {
188 self.non_formatted_ranges.append(&mut ranges);
191 fn append(&self, f: FileName, mut v: Vec<FormattingError>) {
192 self.track_errors(&v);
197 .and_modify(|fe| fe.append(&mut v))
201 fn track_errors(&self, new_errors: &[FormattingError]) {
202 let errs = &mut self.internal.borrow_mut().1;
203 if !new_errors.is_empty() {
204 errs.has_formatting_errors = true;
206 if errs.has_operational_errors && errs.has_check_errors {
209 for err in new_errors {
211 ErrorKind::LineOverflow(..) | ErrorKind::TrailingWhitespace => {
212 errs.has_operational_errors = true;
214 ErrorKind::BadIssue(_)
215 | ErrorKind::LicenseCheck
216 | ErrorKind::DeprecatedAttr
218 | ErrorKind::VersionMismatch => {
219 errs.has_check_errors = true;
226 fn add_diff(&mut self) {
227 self.internal.borrow_mut().1.has_diff = true;
230 fn add_macro_format_failure(&mut self) {
231 self.internal.borrow_mut().1.has_macro_format_failure = true;
234 fn add_parsing_error(&mut self) {
235 self.internal.borrow_mut().1.has_parsing_errors = true;
238 fn warning_count(&self) -> usize {
243 .map(|(_, errors)| errors.len())
247 /// Whether any warnings or errors are present in the report.
248 pub fn has_warnings(&self) -> bool {
249 self.internal.borrow().1.has_formatting_errors
252 /// Print the report to a terminal using colours and potentially other
254 #[deprecated(note = "Use FormatReportFormatter with colors enabled instead")]
257 mut t: Box<dyn term::Terminal<Output = io::Stderr>>,
258 ) -> Result<(), term::Error> {
262 FormatReportFormatterBuilder::new(&self)
270 #[deprecated(note = "Use FormatReportFormatter instead")]
271 impl fmt::Display for FormatReport {
272 // Prints all the formatting errors.
273 fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> Result<(), fmt::Error> {
274 write!(fmt, "{}", FormatReportFormatterBuilder::new(&self).build())?;
279 /// Format the given snippet. The snippet is expected to be *complete* code.
280 /// When we cannot parse the given snippet, this function returns `None`.
281 fn format_snippet(snippet: &str, config: &Config) -> Option<FormattedSnippet> {
282 let mut config = config.clone();
283 panic::catch_unwind(|| {
284 let mut out: Vec<u8> = Vec::with_capacity(snippet.len() * 2);
285 config.set().emit_mode(config::EmitMode::Stdout);
286 config.set().verbose(Verbosity::Quiet);
287 config.set().hide_parse_errors(true);
289 let (formatting_error, result) = {
290 let input = Input::Text(snippet.into());
291 let mut session = Session::new(config, Some(&mut out));
292 let result = session.format(input);
294 session.errors.has_macro_format_failure
295 || session.out.as_ref().unwrap().is_empty() && !snippet.is_empty()
300 if formatting_error {
303 String::from_utf8(out).ok().map(|snippet| FormattedSnippet {
305 non_formatted_ranges: result.unwrap().non_formatted_ranges,
309 // Discard panics encountered while formatting the snippet
310 // The ? operator is needed to remove the extra Option
314 /// Format the given code block. Mainly targeted for code block in comment.
315 /// The code block may be incomplete (i.e., parser may be unable to parse it).
316 /// To avoid panic in parser, we wrap the code block with a dummy function.
317 /// The returned code block does **not** end with newline.
318 fn format_code_block(code_snippet: &str, config: &Config) -> Option<FormattedSnippet> {
319 const FN_MAIN_PREFIX: &str = "fn main() {\n";
321 fn enclose_in_main_block(s: &str, config: &Config) -> String {
322 let indent = Indent::from_width(config, config.tab_spaces());
323 let mut result = String::with_capacity(s.len() * 2);
324 result.push_str(FN_MAIN_PREFIX);
325 let mut need_indent = true;
326 for (kind, line) in LineClasses::new(s) {
328 result.push_str(&indent.to_string(config));
330 result.push_str(&line);
332 need_indent = indent_next_line(kind, &line, config);
338 // Wrap the given code block with `fn main()` if it does not have one.
339 let snippet = enclose_in_main_block(code_snippet, config);
340 let mut result = String::with_capacity(snippet.len());
341 let mut is_first = true;
343 // While formatting the code, ignore the config's newline style setting and always use "\n"
344 // instead of "\r\n" for the newline characters. This is ok because the output here is
345 // not directly outputted by rustfmt command, but used by the comment formatter's input.
346 // We have output-file-wide "\n" ==> "\r\n" conversion process after here if it's necessary.
347 let mut config_with_unix_newline = config.clone();
348 config_with_unix_newline
350 .newline_style(NewlineStyle::Unix);
351 let mut formatted = format_snippet(&snippet, &config_with_unix_newline)?;
352 // Remove wrapping main block
353 formatted.unwrap_code_block();
355 // Trim "fn main() {" on the first line and "}" on the last line,
356 // then unindent the whole code block.
357 let block_len = formatted
360 .unwrap_or_else(|| formatted.snippet.len());
361 let mut is_indented = true;
362 for (kind, ref line) in LineClasses::new(&formatted.snippet[FN_MAIN_PREFIX.len()..block_len]) {
368 let trimmed_line = if !is_indented {
370 } else if line.len() > config.max_width() {
371 // If there are lines that are larger than max width, we cannot tell
372 // whether we have succeeded but have some comments or strings that
373 // are too long, or we have failed to format code block. We will be
374 // conservative and just return `None` in this case.
376 } else if line.len() > config.tab_spaces() {
377 // Make sure that the line has leading whitespaces.
378 let indent_str = Indent::from_width(config, config.tab_spaces()).to_string(config);
379 if line.starts_with(indent_str.as_ref()) {
380 let offset = if config.hard_tabs() {
392 result.push_str(trimmed_line);
393 is_indented = indent_next_line(kind, line, config);
395 Some(FormattedSnippet {
397 non_formatted_ranges: formatted.non_formatted_ranges,
401 /// A session is a run of rustfmt across a single or multiple inputs.
402 pub struct Session<'b, T: Write> {
404 pub out: Option<&'b mut T>,
405 pub(crate) errors: ReportedErrors,
406 source_file: SourceFile,
407 emitter: Box<dyn Emitter + 'b>,
410 impl<'b, T: Write + 'b> Session<'b, T> {
411 pub fn new(config: Config, mut out: Option<&'b mut T>) -> Session<'b, T> {
412 let emitter = create_emitter(&config);
414 if let Some(ref mut out) = out {
415 let _ = emitter.emit_header(out);
422 errors: ReportedErrors::default(),
423 source_file: SourceFile::new(),
427 /// The main entry point for Rustfmt. Formats the given input according to the
428 /// given config. `out` is only necessary if required by the configuration.
429 pub fn format(&mut self, input: Input) -> Result<FormatReport, ErrorKind> {
430 self.format_input_inner(input)
433 pub fn override_config<F, U>(&mut self, mut config: Config, f: F) -> U
435 F: FnOnce(&mut Session<'b, T>) -> U,
437 mem::swap(&mut config, &mut self.config);
438 let result = f(self);
439 mem::swap(&mut config, &mut self.config);
443 pub fn add_operational_error(&mut self) {
444 self.errors.has_operational_errors = true;
447 pub fn has_operational_errors(&self) -> bool {
448 self.errors.has_operational_errors
451 pub fn has_parsing_errors(&self) -> bool {
452 self.errors.has_parsing_errors
455 pub fn has_formatting_errors(&self) -> bool {
456 self.errors.has_formatting_errors
459 pub fn has_check_errors(&self) -> bool {
460 self.errors.has_check_errors
463 pub fn has_diff(&self) -> bool {
467 pub fn has_no_errors(&self) -> bool {
468 !(self.has_operational_errors()
469 || self.has_parsing_errors()
470 || self.has_formatting_errors()
471 || self.has_check_errors()
473 || self.errors.has_macro_format_failure
477 pub(crate) fn create_emitter<'a>(config: &Config) -> Box<dyn Emitter + 'a> {
478 match config.emit_mode() {
479 EmitMode::Files if config.make_backup() => {
480 Box::new(emitter::FilesWithBackupEmitter::default())
482 EmitMode::Files => Box::new(emitter::FilesEmitter::default()),
483 EmitMode::Stdout | EmitMode::Coverage => {
484 Box::new(emitter::StdoutEmitter::new(config.verbose()))
486 EmitMode::ModifiedLines => Box::new(emitter::ModifiedLinesEmitter::default()),
487 EmitMode::Checkstyle => Box::new(emitter::CheckstyleEmitter::default()),
488 EmitMode::Diff => Box::new(emitter::DiffEmitter::new(config.clone())),
492 impl<'b, T: Write + 'b> Drop for Session<'b, T> {
494 if let Some(ref mut out) = self.out {
495 let _ = self.emitter.emit_footer(out);
507 fn is_text(&self) -> bool {
509 Input::File(_) => false,
510 Input::Text(_) => true,
514 fn file_name(&self) -> FileName {
516 Input::File(ref file) => FileName::Real(file.clone()),
517 Input::Text(..) => FileName::Stdin,
521 fn to_directory_ownership(&self) -> Option<DirectoryOwnership> {
523 Input::File(ref file) => {
524 // If there exists a directory with the same name as an input,
525 // then the input should be parsed as a sub module.
526 let file_stem = file.file_stem()?;
527 if file.parent()?.to_path_buf().join(file_stem).is_dir() {
528 Some(DirectoryOwnership::Owned {
529 relative: file_stem.to_str().map(ast::Ident::from_str),
545 fn test_no_panic_on_format_snippet_and_format_code_block() {
546 // `format_snippet()` and `format_code_block()` should not panic
547 // even when we cannot parse the given snippet.
549 assert!(format_snippet(snippet, &Config::default()).is_none());
550 assert!(format_code_block(snippet, &Config::default()).is_none());
553 fn test_format_inner<F>(formatter: F, input: &str, expected: &str) -> bool
555 F: Fn(&str, &Config) -> Option<FormattedSnippet>,
557 let output = formatter(input, &Config::default());
558 output.is_some() && output.unwrap().snippet == expected
562 fn test_format_snippet() {
563 let snippet = "fn main() { println!(\"hello, world\"); }";
565 let expected = "fn main() {\n \
566 println!(\"hello, world\");\n\
569 let expected = "fn main() {\r\n \
570 println!(\"hello, world\");\r\n\
572 assert!(test_format_inner(format_snippet, snippet, expected));
576 fn test_format_code_block_fail() {
578 let code_block = "this_line_is_100_characters_long_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx(x, y, z);";
579 assert!(format_code_block(code_block, &Config::default()).is_none());
583 fn test_format_code_block() {
585 let code_block = "let x=3;";
586 let expected = "let x = 3;";
587 assert!(test_format_inner(format_code_block, code_block, expected));
589 // more complex code block, taken from chains.rs.
591 "let (nested_shape, extend) = if !parent_rewrite_contains_newline && is_continuable(&parent) {
593 chain_indent(context, shape.add_offset(parent_rewrite.len())),
594 context.config.indent_style() == IndentStyle::Visual || is_small_parent,
596 } else if is_block_expr(context, &parent, &parent_rewrite) {
597 match context.config.indent_style() {
598 // Try to put the first child on the same line with parent's last line
599 IndentStyle::Block => (parent_shape.block_indent(context.config.tab_spaces()), true),
600 // The parent is a block, so align the rest of the chain with the closing
602 IndentStyle::Visual => (parent_shape, false),
606 chain_indent(context, shape.add_offset(parent_rewrite.len())),
612 "let (nested_shape, extend) = if !parent_rewrite_contains_newline && is_continuable(&parent) {
614 chain_indent(context, shape.add_offset(parent_rewrite.len())),
615 context.config.indent_style() == IndentStyle::Visual || is_small_parent,
617 } else if is_block_expr(context, &parent, &parent_rewrite) {
618 match context.config.indent_style() {
619 // Try to put the first child on the same line with parent's last line
620 IndentStyle::Block => (parent_shape.block_indent(context.config.tab_spaces()), true),
621 // The parent is a block, so align the rest of the chain with the closing
623 IndentStyle::Visual => (parent_shape, false),
627 chain_indent(context, shape.add_offset(parent_rewrite.len())),
631 assert!(test_format_inner(format_code_block, code_block, expected));