1 use std::collections::{hash_set, HashSet};
3 use std::path::{Path, PathBuf};
6 use itertools::Itertools;
7 use rustfmt_config_proc_macro::config_type;
8 use serde::de::{SeqAccess, Visitor};
9 use serde::ser::SerializeSeq;
10 use serde::{Deserialize, Deserializer, Serialize, Serializer};
12 use crate::config::lists::*;
13 use crate::config::Config;
16 pub enum NewlineStyle {
17 /// Auto-detect based on the raw source input.
19 /// Force CRLF (`\r\n`).
23 /// `\r\n` in Windows, `\n`` on other platforms.
28 /// Where to put the opening brace of items (`fn`, `impl`, etc.).
30 /// Put the opening brace on the next line.
32 /// Put the opening brace on the same line, if possible.
34 /// Prefer the same line except where there is a where-clause, in which
35 /// case force the brace to be put on the next line.
40 /// Where to put the opening brace of conditional expressions (`if`, `match`, etc.).
41 pub enum ControlBraceStyle {
42 /// K&R style, Rust community default
52 pub enum IndentStyle {
53 /// First line on the same line as the opening brace, all lines aligned with
56 /// First line is on a new line and all lines align with **block** indent.
61 /// How to place a list-like items.
62 /// FIXME: Issue-3581: this should be renamed to ItemsLayout when publishing 2.0
64 /// Fit as much on one line as possible.
66 /// Items are placed horizontally if sufficient space, vertically otherwise.
68 /// Place every item on a separate line.
73 /// Spacing around type combinators.
74 pub enum TypeDensity {
75 /// No spaces around "=" and "+"
77 /// Spaces around " = " and " + "
82 /// To what extent does rustfmt pursue its heuristics?
84 /// Turn off any heuristics
86 /// Turn on max heuristics
88 /// Use Rustfmt's defaults
93 pub fn to_list_tactic(self, len: usize) -> ListTactic {
95 Density::Compressed => ListTactic::Mixed,
96 Density::Tall => ListTactic::HorizontalVertical,
97 Density::Vertical if len == 1 => ListTactic::Horizontal,
98 Density::Vertical => ListTactic::Vertical,
104 /// Configuration for import groups, i.e. sets of imports separated by newlines.
105 pub enum GroupImportsTactic {
106 /// Keep groups as they are.
108 /// Discard existing groups, and create new groups for
109 /// 1. `std` / `core` / `alloc` imports
111 /// 3. `self` / `crate` / `super` imports
116 /// How to merge imports.
117 pub enum ImportGranularity {
118 /// Do not merge imports.
120 /// Use one `use` statement per crate.
122 /// Use one `use` statement per module.
127 pub enum ReportTactic {
133 /// What Rustfmt should emit. Mostly corresponds to the `--emit` command line
139 /// Writes the output to stdout.
141 /// Displays how much of the input file was processed
145 /// Writes the resulting diffs in a JSON format. Returns an empty array
146 /// `[]` if there were no diffs.
148 /// Output the changed lines (for internal value only)
150 /// Checks if a diff can be generated. If so, rustfmt outputs a diff and
151 /// quits with exit code 1.
152 /// This option is designed to be run in CI where a non-zero exit signifies
153 /// non-standard code formatting. Used for `--check`.
157 /// Client-preference for coloured output.
160 /// Always use color, whether it is a piped or terminal output
164 /// Automatically use color, if supported by terminal
169 /// rustfmt format style version.
171 /// 1.x.y. When specified, rustfmt will format in the same style as 1.0.0.
173 /// 2.x.y. When specified, rustfmt will format in the the latest style.
178 /// Whether we should use a coloured terminal.
179 pub fn use_colored_tty(self) -> bool {
181 Color::Always | Color::Auto => true,
182 Color::Never => false,
187 /// How chatty should Rustfmt be?
194 /// Emit as little as possible.
198 #[derive(Deserialize, Serialize, Clone, Debug, PartialEq)]
199 pub struct WidthHeuristics {
200 // Maximum width of the args of a function call before falling back
201 // to vertical formatting.
202 pub fn_call_width: usize,
203 // Maximum width of the args of a function-like attributes before falling
204 // back to vertical formatting.
205 pub attr_fn_like_width: usize,
206 // Maximum width in the body of a struct lit before falling back to
207 // vertical formatting.
208 pub struct_lit_width: usize,
209 // Maximum width in the body of a struct variant before falling back
210 // to vertical formatting.
211 pub struct_variant_width: usize,
212 // Maximum width of an array literal before falling back to vertical
214 pub array_width: usize,
215 // Maximum length of a chain to fit on a single line.
216 pub chain_width: usize,
217 // Maximum line length for single line if-else expressions. A value
218 // of zero means always break if-else expressions.
219 pub single_line_if_else_max_width: usize,
222 impl fmt::Display for WidthHeuristics {
223 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
224 write!(f, "{:?}", self)
228 impl WidthHeuristics {
229 // Using this WidthHeuristics means we ignore heuristics.
230 pub fn null() -> WidthHeuristics {
232 fn_call_width: usize::max_value(),
233 attr_fn_like_width: usize::max_value(),
235 struct_variant_width: 0,
236 array_width: usize::max_value(),
237 chain_width: usize::max_value(),
238 single_line_if_else_max_width: 0,
242 pub fn set(max_width: usize) -> WidthHeuristics {
244 fn_call_width: max_width,
245 attr_fn_like_width: max_width,
246 struct_lit_width: max_width,
247 struct_variant_width: max_width,
248 array_width: max_width,
249 chain_width: max_width,
250 single_line_if_else_max_width: max_width,
254 // scale the default WidthHeuristics according to max_width
255 pub fn scaled(max_width: usize) -> WidthHeuristics {
256 const DEFAULT_MAX_WIDTH: usize = 100;
257 let max_width_ratio = if max_width > DEFAULT_MAX_WIDTH {
258 let ratio = max_width as f32 / DEFAULT_MAX_WIDTH as f32;
259 // round to the closest 0.1
260 (ratio * 10.0).round() / 10.0
265 fn_call_width: (60.0 * max_width_ratio).round() as usize,
266 attr_fn_like_width: (70.0 * max_width_ratio).round() as usize,
267 struct_lit_width: (18.0 * max_width_ratio).round() as usize,
268 struct_variant_width: (35.0 * max_width_ratio).round() as usize,
269 array_width: (60.0 * max_width_ratio).round() as usize,
270 chain_width: (60.0 * max_width_ratio).round() as usize,
271 single_line_if_else_max_width: (50.0 * max_width_ratio).round() as usize,
276 impl ::std::str::FromStr for WidthHeuristics {
277 type Err = &'static str;
279 fn from_str(_: &str) -> Result<Self, Self::Err> {
280 Err("WidthHeuristics is not parsable")
284 impl Default for EmitMode {
285 fn default() -> EmitMode {
290 /// A set of directories, files and modules that rustfmt should ignore.
291 #[derive(Default, Clone, Debug, PartialEq)]
292 pub struct IgnoreList {
293 /// A set of path specified in rustfmt.toml.
294 path_set: HashSet<PathBuf>,
295 /// A path to rustfmt.toml.
296 rustfmt_toml_path: PathBuf,
299 impl fmt::Display for IgnoreList {
300 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
306 .format_with(", ", |path, f| f(&format_args!(
308 path.to_string_lossy()
314 impl Serialize for IgnoreList {
315 fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
319 let mut seq = serializer.serialize_seq(Some(self.path_set.len()))?;
320 for e in &self.path_set {
321 seq.serialize_element(e)?;
327 impl<'de> Deserialize<'de> for IgnoreList {
328 fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
330 D: Deserializer<'de>,
332 struct HashSetVisitor;
333 impl<'v> Visitor<'v> for HashSetVisitor {
334 type Value = HashSet<PathBuf>;
336 fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
337 formatter.write_str("a sequence of path")
340 fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error>
344 let mut path_set = HashSet::new();
345 while let Some(elem) = seq.next_element()? {
346 path_set.insert(elem);
352 path_set: deserializer.deserialize_seq(HashSetVisitor)?,
353 rustfmt_toml_path: PathBuf::new(),
358 impl<'a> IntoIterator for &'a IgnoreList {
359 type Item = &'a PathBuf;
360 type IntoIter = hash_set::Iter<'a, PathBuf>;
362 fn into_iter(self) -> Self::IntoIter {
368 pub fn add_prefix(&mut self, dir: &Path) {
369 self.rustfmt_toml_path = dir.to_path_buf();
372 pub fn rustfmt_toml_path(&self) -> &Path {
373 &self.rustfmt_toml_path
377 impl FromStr for IgnoreList {
378 type Err = &'static str;
380 fn from_str(_: &str) -> Result<Self, Self::Err> {
381 Err("IgnoreList is not parsable")
385 /// Maps client-supplied options to Rustfmt's internals, mostly overriding
386 /// values in a config with values from the command line.
387 pub trait CliOptions {
388 fn apply_to(self, config: &mut Config);
389 fn config_path(&self) -> Option<&Path>;
392 /// The edition of the syntax and semntics of code (RFC 2052).
409 impl Default for Edition {
410 fn default() -> Edition {
415 impl From<Edition> for rustc_span::edition::Edition {
416 fn from(edition: Edition) -> Self {
418 Edition::Edition2015 => Self::Edition2015,
419 Edition::Edition2018 => Self::Edition2018,
420 Edition::Edition2021 => Self::Edition2021,
425 impl PartialOrd for Edition {
426 fn partial_cmp(&self, other: &Edition) -> Option<std::cmp::Ordering> {
427 rustc_span::edition::Edition::partial_cmp(&(*self).into(), &(*other).into())
431 /// Controls how rustfmt should handle leading pipes on match arms.
433 pub enum MatchArmLeadingPipe {
434 /// Place leading pipes on all match arms
436 /// Never emit leading pipes on match arms
438 /// Preserve any existing leading pipes