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::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(Error, Debug)]
89 /// Line has exceeded character limit (found, maximum).
91 "line formatted, but exceeded maximum width \
92 (maximum: {1} (see `max_width` option), found: {0})"
94 LineOverflow(usize, usize),
95 /// Line ends in whitespace.
96 #[error("left behind trailing whitespace")]
98 /// TODO or FIXME item without an issue number.
101 /// License check has failed.
102 #[error("license check failed")]
104 /// Used deprecated skip attribute.
105 #[error("`rustfmt_skip` is deprecated; use `rustfmt::skip`")]
107 /// Used a rustfmt:: attribute other than skip or skip::macros.
108 #[error("invalid attribute")]
110 /// An io error during reading or writing.
111 #[error("io error: {0}")]
113 /// Parse error occurred when parsing the input.
114 #[error("parse error")]
116 /// The user mandated a version and the current version of Rustfmt does not
117 /// satisfy that requirement.
118 #[error("version mismatch")]
120 /// If we had formatted the given node, then we would have lost a comment.
121 #[error("not formatted because a comment would be lost")]
123 /// Invalid glob pattern in `ignore` configuration option.
124 #[error("Invalid glob pattern found in ignore list: {0}")]
125 InvalidGlobPattern(ignore::Error),
129 fn is_comment(&self) -> bool {
131 ErrorKind::LostComment => true,
137 impl From<io::Error> for ErrorKind {
138 fn from(e: io::Error) -> ErrorKind {
139 ErrorKind::IoError(e)
143 /// Result of formatting a snippet of code along with ranges of lines that didn't get formatted,
144 /// i.e., that got returned as they were originally.
146 struct FormattedSnippet {
148 non_formatted_ranges: Vec<(usize, usize)>,
151 impl FormattedSnippet {
152 /// In case the snippet needed to be wrapped in a function, this shifts down the ranges of
153 /// non-formatted code.
154 fn unwrap_code_block(&mut self) {
155 self.non_formatted_ranges
157 .for_each(|(low, high)| {
163 /// Returns `true` if the line n did not get formatted.
164 fn is_line_non_formatted(&self, n: usize) -> bool {
165 self.non_formatted_ranges
167 .any(|(low, high)| *low <= n && n <= *high)
171 /// Reports on any issues that occurred during a run of Rustfmt.
173 /// Can be reported to the user using the `Display` impl on [`FormatReportFormatter`].
175 pub struct FormatReport {
176 // Maps stringified file paths to their associated formatting errors.
177 internal: Rc<RefCell<(FormatErrorMap, ReportedErrors)>>,
178 non_formatted_ranges: Vec<(usize, usize)>,
182 fn new() -> FormatReport {
184 internal: Rc::new(RefCell::new((HashMap::new(), ReportedErrors::default()))),
185 non_formatted_ranges: Vec::new(),
189 fn add_non_formatted_ranges(&mut self, mut ranges: Vec<(usize, usize)>) {
190 self.non_formatted_ranges.append(&mut ranges);
193 fn append(&self, f: FileName, mut v: Vec<FormattingError>) {
194 self.track_errors(&v);
199 .and_modify(|fe| fe.append(&mut v))
203 fn track_errors(&self, new_errors: &[FormattingError]) {
204 let errs = &mut self.internal.borrow_mut().1;
205 if !new_errors.is_empty() {
206 errs.has_formatting_errors = true;
208 if errs.has_operational_errors && errs.has_check_errors {
211 for err in new_errors {
213 ErrorKind::LineOverflow(..) | ErrorKind::TrailingWhitespace => {
214 errs.has_operational_errors = true;
216 ErrorKind::BadIssue(_)
217 | ErrorKind::LicenseCheck
218 | ErrorKind::DeprecatedAttr
220 | ErrorKind::VersionMismatch => {
221 errs.has_check_errors = true;
228 fn add_diff(&mut self) {
229 self.internal.borrow_mut().1.has_diff = true;
232 fn add_macro_format_failure(&mut self) {
233 self.internal.borrow_mut().1.has_macro_format_failure = true;
236 fn add_parsing_error(&mut self) {
237 self.internal.borrow_mut().1.has_parsing_errors = true;
240 fn warning_count(&self) -> usize {
245 .map(|(_, errors)| errors.len())
249 /// Whether any warnings or errors are present in the report.
250 pub fn has_warnings(&self) -> bool {
251 self.internal.borrow().1.has_formatting_errors
254 /// Print the report to a terminal using colours and potentially other
256 #[deprecated(note = "Use FormatReportFormatter with colors enabled instead")]
259 mut t: Box<dyn term::Terminal<Output = io::Stderr>>,
260 ) -> Result<(), term::Error> {
264 FormatReportFormatterBuilder::new(&self)
272 #[deprecated(note = "Use FormatReportFormatter instead")]
273 impl fmt::Display for FormatReport {
274 // Prints all the formatting errors.
275 fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> Result<(), fmt::Error> {
276 write!(fmt, "{}", FormatReportFormatterBuilder::new(&self).build())?;
281 /// Format the given snippet. The snippet is expected to be *complete* code.
282 /// When we cannot parse the given snippet, this function returns `None`.
283 fn format_snippet(snippet: &str, config: &Config) -> Option<FormattedSnippet> {
284 let mut config = config.clone();
285 panic::catch_unwind(|| {
286 let mut out: Vec<u8> = Vec::with_capacity(snippet.len() * 2);
287 config.set().emit_mode(config::EmitMode::Stdout);
288 config.set().verbose(Verbosity::Quiet);
289 config.set().hide_parse_errors(true);
291 let (formatting_error, result) = {
292 let input = Input::Text(snippet.into());
293 let mut session = Session::new(config, Some(&mut out));
294 let result = session.format(input);
296 session.errors.has_macro_format_failure
297 || session.out.as_ref().unwrap().is_empty() && !snippet.is_empty()
302 if formatting_error {
305 String::from_utf8(out).ok().map(|snippet| FormattedSnippet {
307 non_formatted_ranges: result.unwrap().non_formatted_ranges,
311 // Discard panics encountered while formatting the snippet
312 // The ? operator is needed to remove the extra Option
316 /// Format the given code block. Mainly targeted for code block in comment.
317 /// The code block may be incomplete (i.e., parser may be unable to parse it).
318 /// To avoid panic in parser, we wrap the code block with a dummy function.
319 /// The returned code block does **not** end with newline.
320 fn format_code_block(code_snippet: &str, config: &Config) -> Option<FormattedSnippet> {
321 const FN_MAIN_PREFIX: &str = "fn main() {\n";
323 fn enclose_in_main_block(s: &str, config: &Config) -> String {
324 let indent = Indent::from_width(config, config.tab_spaces());
325 let mut result = String::with_capacity(s.len() * 2);
326 result.push_str(FN_MAIN_PREFIX);
327 let mut need_indent = true;
328 for (kind, line) in LineClasses::new(s) {
330 result.push_str(&indent.to_string(config));
332 result.push_str(&line);
334 need_indent = indent_next_line(kind, &line, config);
340 // Wrap the given code block with `fn main()` if it does not have one.
341 let snippet = enclose_in_main_block(code_snippet, config);
342 let mut result = String::with_capacity(snippet.len());
343 let mut is_first = true;
345 // While formatting the code, ignore the config's newline style setting and always use "\n"
346 // instead of "\r\n" for the newline characters. This is ok because the output here is
347 // not directly outputted by rustfmt command, but used by the comment formatter's input.
348 // We have output-file-wide "\n" ==> "\r\n" conversion process after here if it's necessary.
349 let mut config_with_unix_newline = config.clone();
350 config_with_unix_newline
352 .newline_style(NewlineStyle::Unix);
353 let mut formatted = format_snippet(&snippet, &config_with_unix_newline)?;
354 // Remove wrapping main block
355 formatted.unwrap_code_block();
357 // Trim "fn main() {" on the first line and "}" on the last line,
358 // then unindent the whole code block.
359 let block_len = formatted
362 .unwrap_or_else(|| formatted.snippet.len());
363 let mut is_indented = true;
364 for (kind, ref line) in LineClasses::new(&formatted.snippet[FN_MAIN_PREFIX.len()..block_len]) {
370 let trimmed_line = if !is_indented {
372 } else if line.len() > config.max_width() {
373 // If there are lines that are larger than max width, we cannot tell
374 // whether we have succeeded but have some comments or strings that
375 // are too long, or we have failed to format code block. We will be
376 // conservative and just return `None` in this case.
378 } else if line.len() > config.tab_spaces() {
379 // Make sure that the line has leading whitespaces.
380 let indent_str = Indent::from_width(config, config.tab_spaces()).to_string(config);
381 if line.starts_with(indent_str.as_ref()) {
382 let offset = if config.hard_tabs() {
394 result.push_str(trimmed_line);
395 is_indented = indent_next_line(kind, line, config);
397 Some(FormattedSnippet {
399 non_formatted_ranges: formatted.non_formatted_ranges,
403 /// A session is a run of rustfmt across a single or multiple inputs.
404 pub struct Session<'b, T: Write> {
406 pub out: Option<&'b mut T>,
407 pub(crate) errors: ReportedErrors,
408 source_file: SourceFile,
409 emitter: Box<dyn Emitter + 'b>,
412 impl<'b, T: Write + 'b> Session<'b, T> {
413 pub fn new(config: Config, mut out: Option<&'b mut T>) -> Session<'b, T> {
414 let emitter = create_emitter(&config);
416 if let Some(ref mut out) = out {
417 let _ = emitter.emit_header(out);
424 errors: ReportedErrors::default(),
425 source_file: SourceFile::new(),
429 /// The main entry point for Rustfmt. Formats the given input according to the
430 /// given config. `out` is only necessary if required by the configuration.
431 pub fn format(&mut self, input: Input) -> Result<FormatReport, ErrorKind> {
432 self.format_input_inner(input)
435 pub fn override_config<F, U>(&mut self, mut config: Config, f: F) -> U
437 F: FnOnce(&mut Session<'b, T>) -> U,
439 mem::swap(&mut config, &mut self.config);
440 let result = f(self);
441 mem::swap(&mut config, &mut self.config);
445 pub fn add_operational_error(&mut self) {
446 self.errors.has_operational_errors = true;
449 pub fn has_operational_errors(&self) -> bool {
450 self.errors.has_operational_errors
453 pub fn has_parsing_errors(&self) -> bool {
454 self.errors.has_parsing_errors
457 pub fn has_formatting_errors(&self) -> bool {
458 self.errors.has_formatting_errors
461 pub fn has_check_errors(&self) -> bool {
462 self.errors.has_check_errors
465 pub fn has_diff(&self) -> bool {
469 pub fn has_no_errors(&self) -> bool {
470 !(self.has_operational_errors()
471 || self.has_parsing_errors()
472 || self.has_formatting_errors()
473 || self.has_check_errors()
475 || self.errors.has_macro_format_failure
479 pub(crate) fn create_emitter<'a>(config: &Config) -> Box<dyn Emitter + 'a> {
480 match config.emit_mode() {
481 EmitMode::Files if config.make_backup() => {
482 Box::new(emitter::FilesWithBackupEmitter::default())
484 EmitMode::Files => Box::new(emitter::FilesEmitter::new(
485 config.print_misformatted_file_names(),
487 EmitMode::Stdout | EmitMode::Coverage => {
488 Box::new(emitter::StdoutEmitter::new(config.verbose()))
490 EmitMode::Json => Box::new(emitter::JsonEmitter::default()),
491 EmitMode::ModifiedLines => Box::new(emitter::ModifiedLinesEmitter::default()),
492 EmitMode::Checkstyle => Box::new(emitter::CheckstyleEmitter::default()),
493 EmitMode::Diff => Box::new(emitter::DiffEmitter::new(config.clone())),
497 impl<'b, T: Write + 'b> Drop for Session<'b, T> {
499 if let Some(ref mut out) = self.out {
500 let _ = self.emitter.emit_footer(out);
512 fn file_name(&self) -> FileName {
514 Input::File(ref file) => FileName::Real(file.clone()),
515 Input::Text(..) => FileName::Stdin,
519 fn to_directory_ownership(&self) -> Option<DirectoryOwnership> {
521 Input::File(ref file) => {
522 // If there exists a directory with the same name as an input,
523 // then the input should be parsed as a sub module.
524 let file_stem = file.file_stem()?;
525 if file.parent()?.to_path_buf().join(file_stem).is_dir() {
526 Some(DirectoryOwnership::Owned {
527 relative: file_stem.to_str().map(symbol::Ident::from_str),
543 fn test_no_panic_on_format_snippet_and_format_code_block() {
544 // `format_snippet()` and `format_code_block()` should not panic
545 // even when we cannot parse the given snippet.
547 assert!(format_snippet(snippet, &Config::default()).is_none());
548 assert!(format_code_block(snippet, &Config::default()).is_none());
551 fn test_format_inner<F>(formatter: F, input: &str, expected: &str) -> bool
553 F: Fn(&str, &Config) -> Option<FormattedSnippet>,
555 let output = formatter(input, &Config::default());
556 output.is_some() && output.unwrap().snippet == expected
560 fn test_format_snippet() {
561 let snippet = "fn main() { println!(\"hello, world\"); }";
563 let expected = "fn main() {\n \
564 println!(\"hello, world\");\n\
567 let expected = "fn main() {\r\n \
568 println!(\"hello, world\");\r\n\
570 assert!(test_format_inner(format_snippet, snippet, expected));
574 fn test_format_code_block_fail() {
576 let code_block = "this_line_is_100_characters_long_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx(x, y, z);";
577 assert!(format_code_block(code_block, &Config::default()).is_none());
581 fn test_format_code_block() {
583 let code_block = "let x=3;";
584 let expected = "let x = 3;";
585 assert!(test_format_inner(format_code_block, code_block, expected));
587 // more complex code block, taken from chains.rs.
589 "let (nested_shape, extend) = if !parent_rewrite_contains_newline && is_continuable(&parent) {
591 chain_indent(context, shape.add_offset(parent_rewrite.len())),
592 context.config.indent_style() == IndentStyle::Visual || is_small_parent,
594 } else if is_block_expr(context, &parent, &parent_rewrite) {
595 match context.config.indent_style() {
596 // Try to put the first child on the same line with parent's last line
597 IndentStyle::Block => (parent_shape.block_indent(context.config.tab_spaces()), true),
598 // The parent is a block, so align the rest of the chain with the closing
600 IndentStyle::Visual => (parent_shape, false),
604 chain_indent(context, shape.add_offset(parent_rewrite.len())),
610 "let (nested_shape, extend) = if !parent_rewrite_contains_newline && is_continuable(&parent) {
612 chain_indent(context, shape.add_offset(parent_rewrite.len())),
613 context.config.indent_style() == IndentStyle::Visual || is_small_parent,
615 } else if is_block_expr(context, &parent, &parent_rewrite) {
616 match context.config.indent_style() {
617 // Try to put the first child on the same line with parent's last line
618 IndentStyle::Block => (parent_shape.block_indent(context.config.tab_spaces()), true),
619 // The parent is a block, so align the rest of the chain with the closing
621 IndentStyle::Visual => (parent_shape, false),
625 chain_indent(context, shape.add_offset(parent_rewrite.len())),
629 assert!(test_format_inner(format_code_block, code_block, expected));