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;
22 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::modules::ModuleResolutionError;
30 use crate::shape::Indent;
31 use crate::syntux::parser::DirectoryOwnership;
32 use crate::utils::indent_next_line;
34 pub use crate::config::{
35 load_config, CliOptions, Color, Config, Edition, EmitMode, FileLines, FileName, NewlineStyle,
39 pub use crate::format_report_formatter::{FormatReportFormatter, FormatReportFormatterBuilder};
41 pub use crate::rustfmt_diff::{ModifiedChunk, ModifiedLines};
50 pub(crate) mod config;
54 mod format_report_formatter;
55 pub(crate) mod formatting;
64 pub(crate) mod modules;
71 pub(crate) mod rustfmt_diff;
74 pub(crate) mod source_file;
75 pub(crate) mod source_map;
84 pub(crate) mod visitor;
86 /// The various errors that can occur during formatting. Note that not all of
87 /// these can currently be propagated to clients.
88 #[derive(Error, Debug)]
90 /// Line has exceeded character limit (found, maximum).
92 "line formatted, but exceeded maximum width \
93 (maximum: {1} (see `max_width` option), found: {0})"
95 LineOverflow(usize, usize),
96 /// Line ends in whitespace.
97 #[error("left behind trailing whitespace")]
99 /// TODO or FIXME item without an issue number.
100 #[error("found {0}")]
102 /// License check has failed.
103 #[error("license check failed")]
105 /// Used deprecated skip attribute.
106 #[error("`rustfmt_skip` is deprecated; use `rustfmt::skip`")]
108 /// Used a rustfmt:: attribute other than skip or skip::macros.
109 #[error("invalid attribute")]
111 /// An io error during reading or writing.
112 #[error("io error: {0}")]
114 /// Error during module resolution.
116 ModuleResolutionError(#[from] ModuleResolutionError),
117 /// Parse error occurred when parsing the input.
118 #[error("parse error")]
120 /// The user mandated a version and the current version of Rustfmt does not
121 /// satisfy that requirement.
122 #[error("version mismatch")]
124 /// If we had formatted the given node, then we would have lost a comment.
125 #[error("not formatted because a comment would be lost")]
127 /// Invalid glob pattern in `ignore` configuration option.
128 #[error("Invalid glob pattern found in ignore list: {0}")]
129 InvalidGlobPattern(ignore::Error),
133 fn is_comment(&self) -> bool {
135 ErrorKind::LostComment => true,
141 impl From<io::Error> for ErrorKind {
142 fn from(e: io::Error) -> ErrorKind {
143 ErrorKind::IoError(e)
147 /// Result of formatting a snippet of code along with ranges of lines that didn't get formatted,
148 /// i.e., that got returned as they were originally.
150 struct FormattedSnippet {
152 non_formatted_ranges: Vec<(usize, usize)>,
155 impl FormattedSnippet {
156 /// In case the snippet needed to be wrapped in a function, this shifts down the ranges of
157 /// non-formatted code.
158 fn unwrap_code_block(&mut self) {
159 self.non_formatted_ranges
161 .for_each(|(low, high)| {
167 /// Returns `true` if the line n did not get formatted.
168 fn is_line_non_formatted(&self, n: usize) -> bool {
169 self.non_formatted_ranges
171 .any(|(low, high)| *low <= n && n <= *high)
175 /// Reports on any issues that occurred during a run of Rustfmt.
177 /// Can be reported to the user using the `Display` impl on [`FormatReportFormatter`].
179 pub struct FormatReport {
180 // Maps stringified file paths to their associated formatting errors.
181 internal: Rc<RefCell<(FormatErrorMap, ReportedErrors)>>,
182 non_formatted_ranges: Vec<(usize, usize)>,
186 fn new() -> FormatReport {
188 internal: Rc::new(RefCell::new((HashMap::new(), ReportedErrors::default()))),
189 non_formatted_ranges: Vec::new(),
193 fn add_non_formatted_ranges(&mut self, mut ranges: Vec<(usize, usize)>) {
194 self.non_formatted_ranges.append(&mut ranges);
197 fn append(&self, f: FileName, mut v: Vec<FormattingError>) {
198 self.track_errors(&v);
203 .and_modify(|fe| fe.append(&mut v))
207 fn track_errors(&self, new_errors: &[FormattingError]) {
208 let errs = &mut self.internal.borrow_mut().1;
209 if !new_errors.is_empty() {
210 errs.has_formatting_errors = true;
212 if errs.has_operational_errors && errs.has_check_errors {
215 for err in new_errors {
217 ErrorKind::LineOverflow(..) | ErrorKind::TrailingWhitespace => {
218 errs.has_operational_errors = true;
220 ErrorKind::BadIssue(_)
221 | ErrorKind::LicenseCheck
222 | ErrorKind::DeprecatedAttr
224 | ErrorKind::VersionMismatch => {
225 errs.has_check_errors = true;
232 fn add_diff(&mut self) {
233 self.internal.borrow_mut().1.has_diff = true;
236 fn add_macro_format_failure(&mut self) {
237 self.internal.borrow_mut().1.has_macro_format_failure = true;
240 fn add_parsing_error(&mut self) {
241 self.internal.borrow_mut().1.has_parsing_errors = true;
244 fn warning_count(&self) -> usize {
249 .map(|(_, errors)| errors.len())
253 /// Whether any warnings or errors are present in the report.
254 pub fn has_warnings(&self) -> bool {
255 self.internal.borrow().1.has_formatting_errors
258 /// Print the report to a terminal using colours and potentially other
260 #[deprecated(note = "Use FormatReportFormatter with colors enabled instead")]
263 mut t: Box<dyn term::Terminal<Output = io::Stderr>>,
264 ) -> Result<(), term::Error> {
268 FormatReportFormatterBuilder::new(&self)
276 /// Deprecated - Use FormatReportFormatter instead
277 // https://github.com/rust-lang/rust/issues/78625
278 // https://github.com/rust-lang/rust/issues/39935
279 impl fmt::Display for FormatReport {
280 // Prints all the formatting errors.
281 fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> Result<(), fmt::Error> {
282 write!(fmt, "{}", FormatReportFormatterBuilder::new(&self).build())?;
287 /// Format the given snippet. The snippet is expected to be *complete* code.
288 /// When we cannot parse the given snippet, this function returns `None`.
289 fn format_snippet(snippet: &str, config: &Config) -> Option<FormattedSnippet> {
290 let mut config = config.clone();
291 panic::catch_unwind(|| {
292 let mut out: Vec<u8> = Vec::with_capacity(snippet.len() * 2);
293 config.set().emit_mode(config::EmitMode::Stdout);
294 config.set().verbose(Verbosity::Quiet);
295 config.set().hide_parse_errors(true);
297 let (formatting_error, result) = {
298 let input = Input::Text(snippet.into());
299 let mut session = Session::new(config, Some(&mut out));
300 let result = session.format(input);
302 session.errors.has_macro_format_failure
303 || session.out.as_ref().unwrap().is_empty() && !snippet.is_empty()
308 if formatting_error {
311 String::from_utf8(out).ok().map(|snippet| FormattedSnippet {
313 non_formatted_ranges: result.unwrap().non_formatted_ranges,
317 // Discard panics encountered while formatting the snippet
318 // The ? operator is needed to remove the extra Option
322 /// Format the given code block. Mainly targeted for code block in comment.
323 /// The code block may be incomplete (i.e., parser may be unable to parse it).
324 /// To avoid panic in parser, we wrap the code block with a dummy function.
325 /// The returned code block does **not** end with newline.
326 fn format_code_block(code_snippet: &str, config: &Config) -> Option<FormattedSnippet> {
327 const FN_MAIN_PREFIX: &str = "fn main() {\n";
329 fn enclose_in_main_block(s: &str, config: &Config) -> String {
330 let indent = Indent::from_width(config, config.tab_spaces());
331 let mut result = String::with_capacity(s.len() * 2);
332 result.push_str(FN_MAIN_PREFIX);
333 let mut need_indent = true;
334 for (kind, line) in LineClasses::new(s) {
336 result.push_str(&indent.to_string(config));
338 result.push_str(&line);
340 need_indent = indent_next_line(kind, &line, config);
346 // Wrap the given code block with `fn main()` if it does not have one.
347 let snippet = enclose_in_main_block(code_snippet, config);
348 let mut result = String::with_capacity(snippet.len());
349 let mut is_first = true;
351 // While formatting the code, ignore the config's newline style setting and always use "\n"
352 // instead of "\r\n" for the newline characters. This is ok because the output here is
353 // not directly outputted by rustfmt command, but used by the comment formatter's input.
354 // We have output-file-wide "\n" ==> "\r\n" conversion process after here if it's necessary.
355 let mut config_with_unix_newline = config.clone();
356 config_with_unix_newline
358 .newline_style(NewlineStyle::Unix);
359 let mut formatted = format_snippet(&snippet, &config_with_unix_newline)?;
360 // Remove wrapping main block
361 formatted.unwrap_code_block();
363 // Trim "fn main() {" on the first line and "}" on the last line,
364 // then unindent the whole code block.
365 let block_len = formatted
368 .unwrap_or_else(|| formatted.snippet.len());
369 let mut is_indented = true;
370 for (kind, ref line) in LineClasses::new(&formatted.snippet[FN_MAIN_PREFIX.len()..block_len]) {
376 let trimmed_line = if !is_indented {
378 } else if line.len() > config.max_width() {
379 // If there are lines that are larger than max width, we cannot tell
380 // whether we have succeeded but have some comments or strings that
381 // are too long, or we have failed to format code block. We will be
382 // conservative and just return `None` in this case.
384 } else if line.len() > config.tab_spaces() {
385 // Make sure that the line has leading whitespaces.
386 let indent_str = Indent::from_width(config, config.tab_spaces()).to_string(config);
387 if line.starts_with(indent_str.as_ref()) {
388 let offset = if config.hard_tabs() {
400 result.push_str(trimmed_line);
401 is_indented = indent_next_line(kind, line, config);
403 Some(FormattedSnippet {
405 non_formatted_ranges: formatted.non_formatted_ranges,
409 /// A session is a run of rustfmt across a single or multiple inputs.
410 pub struct Session<'b, T: Write> {
412 pub out: Option<&'b mut T>,
413 pub(crate) errors: ReportedErrors,
414 source_file: SourceFile,
415 emitter: Box<dyn Emitter + 'b>,
418 impl<'b, T: Write + 'b> Session<'b, T> {
419 pub fn new(config: Config, mut out: Option<&'b mut T>) -> Session<'b, T> {
420 let emitter = create_emitter(&config);
422 if let Some(ref mut out) = out {
423 let _ = emitter.emit_header(out);
430 errors: ReportedErrors::default(),
431 source_file: SourceFile::new(),
435 /// The main entry point for Rustfmt. Formats the given input according to the
436 /// given config. `out` is only necessary if required by the configuration.
437 pub fn format(&mut self, input: Input) -> Result<FormatReport, ErrorKind> {
438 self.format_input_inner(input)
441 pub fn override_config<F, U>(&mut self, mut config: Config, f: F) -> U
443 F: FnOnce(&mut Session<'b, T>) -> U,
445 mem::swap(&mut config, &mut self.config);
446 let result = f(self);
447 mem::swap(&mut config, &mut self.config);
451 pub fn add_operational_error(&mut self) {
452 self.errors.has_operational_errors = true;
455 pub fn has_operational_errors(&self) -> bool {
456 self.errors.has_operational_errors
459 pub fn has_parsing_errors(&self) -> bool {
460 self.errors.has_parsing_errors
463 pub fn has_formatting_errors(&self) -> bool {
464 self.errors.has_formatting_errors
467 pub fn has_check_errors(&self) -> bool {
468 self.errors.has_check_errors
471 pub fn has_diff(&self) -> bool {
475 pub fn has_no_errors(&self) -> bool {
476 !(self.has_operational_errors()
477 || self.has_parsing_errors()
478 || self.has_formatting_errors()
479 || self.has_check_errors()
481 || self.errors.has_macro_format_failure
485 pub(crate) fn create_emitter<'a>(config: &Config) -> Box<dyn Emitter + 'a> {
486 match config.emit_mode() {
487 EmitMode::Files if config.make_backup() => {
488 Box::new(emitter::FilesWithBackupEmitter::default())
490 EmitMode::Files => Box::new(emitter::FilesEmitter::new(
491 config.print_misformatted_file_names(),
493 EmitMode::Stdout | EmitMode::Coverage => {
494 Box::new(emitter::StdoutEmitter::new(config.verbose()))
496 EmitMode::Json => Box::new(emitter::JsonEmitter::default()),
497 EmitMode::ModifiedLines => Box::new(emitter::ModifiedLinesEmitter::default()),
498 EmitMode::Checkstyle => Box::new(emitter::CheckstyleEmitter::default()),
499 EmitMode::Diff => Box::new(emitter::DiffEmitter::new(config.clone())),
503 impl<'b, T: Write + 'b> Drop for Session<'b, T> {
505 if let Some(ref mut out) = self.out {
506 let _ = self.emitter.emit_footer(out);
518 fn file_name(&self) -> FileName {
520 Input::File(ref file) => FileName::Real(file.clone()),
521 Input::Text(..) => FileName::Stdin,
525 fn to_directory_ownership(&self) -> Option<DirectoryOwnership> {
527 Input::File(ref file) => {
528 // If there exists a directory with the same name as an input,
529 // then the input should be parsed as a sub module.
530 let file_stem = file.file_stem()?;
531 if file.parent()?.to_path_buf().join(file_stem).is_dir() {
532 Some(DirectoryOwnership::Owned {
533 relative: file_stem.to_str().map(symbol::Ident::from_str),
549 fn test_no_panic_on_format_snippet_and_format_code_block() {
550 // `format_snippet()` and `format_code_block()` should not panic
551 // even when we cannot parse the given snippet.
553 assert!(format_snippet(snippet, &Config::default()).is_none());
554 assert!(format_code_block(snippet, &Config::default()).is_none());
557 fn test_format_inner<F>(formatter: F, input: &str, expected: &str) -> bool
559 F: Fn(&str, &Config) -> Option<FormattedSnippet>,
561 let output = formatter(input, &Config::default());
562 output.is_some() && output.unwrap().snippet == expected
566 fn test_format_snippet() {
567 let snippet = "fn main() { println!(\"hello, world\"); }";
569 let expected = "fn main() {\n \
570 println!(\"hello, world\");\n\
573 let expected = "fn main() {\r\n \
574 println!(\"hello, world\");\r\n\
576 assert!(test_format_inner(format_snippet, snippet, expected));
580 fn test_format_code_block_fail() {
582 let code_block = "this_line_is_100_characters_long_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx(x, y, z);";
583 assert!(format_code_block(code_block, &Config::default()).is_none());
587 fn test_format_code_block() {
589 let code_block = "let x=3;";
590 let expected = "let x = 3;";
591 assert!(test_format_inner(format_code_block, code_block, expected));
593 // more complex code block, taken from chains.rs.
595 "let (nested_shape, extend) = if !parent_rewrite_contains_newline && is_continuable(&parent) {
597 chain_indent(context, shape.add_offset(parent_rewrite.len())),
598 context.config.indent_style() == IndentStyle::Visual || is_small_parent,
600 } else if is_block_expr(context, &parent, &parent_rewrite) {
601 match context.config.indent_style() {
602 // Try to put the first child on the same line with parent's last line
603 IndentStyle::Block => (parent_shape.block_indent(context.config.tab_spaces()), true),
604 // The parent is a block, so align the rest of the chain with the closing
606 IndentStyle::Visual => (parent_shape, false),
610 chain_indent(context, shape.add_offset(parent_rewrite.len())),
616 "let (nested_shape, extend) = if !parent_rewrite_contains_newline && is_continuable(&parent) {
618 chain_indent(context, shape.add_offset(parent_rewrite.len())),
619 context.config.indent_style() == IndentStyle::Visual || is_small_parent,
621 } else if is_block_expr(context, &parent, &parent_rewrite) {
622 match context.config.indent_style() {
623 // Try to put the first child on the same line with parent's last line
624 IndentStyle::Block => (parent_shape.block_indent(context.config.tab_spaces()), true),
625 // The parent is a block, so align the rest of the chain with the closing
627 IndentStyle::Visual => (parent_shape, false),
631 chain_indent(context, shape.add_offset(parent_rewrite.len())),
635 assert!(test_format_inner(format_code_block, code_block, expected));