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1a4d82fc JJ |
1 | // Copyright 2013 The Rust Project Developers. See the COPYRIGHT |
2 | // file at the top-level directory of this distribution and at | |
3 | // http://rust-lang.org/COPYRIGHT. | |
4 | // | |
5 | // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or | |
6 | // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license | |
7 | // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your | |
8 | // option. This file may not be copied, modified, or distributed | |
9 | // except according to those terms. | |
10 | ||
11 | //! Macro support for format strings | |
12 | //! | |
13 | //! These structures are used when parsing format strings for the compiler. | |
14 | //! Parsing does not happen at runtime: structures of `std::fmt::rt` are | |
15 | //! generated instead. | |
16 | ||
17 | #![crate_name = "fmt_macros"] | |
e9174d1e | 18 | #![unstable(feature = "rustc_private", issue = "27812")] |
1a4d82fc JJ |
19 | #![crate_type = "rlib"] |
20 | #![crate_type = "dylib"] | |
e9174d1e | 21 | #![doc(html_logo_url = "https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png", |
62682a34 | 22 | html_favicon_url = "https://doc.rust-lang.org/favicon.ico", |
e9174d1e | 23 | html_root_url = "https://doc.rust-lang.org/nightly/", |
92a42be0 SL |
24 | html_playground_url = "https://play.rust-lang.org/", |
25 | test(attr(deny(warnings))))] | |
7453a54e | 26 | #![cfg_attr(not(stage0), deny(warnings))] |
1a4d82fc | 27 | |
85aaf69f SL |
28 | #![feature(staged_api)] |
29 | #![feature(unicode)] | |
1a4d82fc JJ |
30 | |
31 | pub use self::Piece::*; | |
32 | pub use self::Position::*; | |
33 | pub use self::Alignment::*; | |
34 | pub use self::Flag::*; | |
35 | pub use self::Count::*; | |
36 | ||
37 | use std::str; | |
38 | use std::string; | |
e9174d1e | 39 | use std::iter; |
1a4d82fc JJ |
40 | |
41 | /// A piece is a portion of the format string which represents the next part | |
42 | /// to emit. These are emitted as a stream by the `Parser` class. | |
c34b1796 | 43 | #[derive(Copy, Clone, PartialEq)] |
1a4d82fc JJ |
44 | pub enum Piece<'a> { |
45 | /// A literal string which should directly be emitted | |
46 | String(&'a str), | |
47 | /// This describes that formatting should process the next argument (as | |
48 | /// specified inside) for emission. | |
49 | NextArgument(Argument<'a>), | |
50 | } | |
51 | ||
52 | /// Representation of an argument specification. | |
c34b1796 | 53 | #[derive(Copy, Clone, PartialEq)] |
1a4d82fc JJ |
54 | pub struct Argument<'a> { |
55 | /// Where to find this argument | |
56 | pub position: Position<'a>, | |
57 | /// How to format the argument | |
58 | pub format: FormatSpec<'a>, | |
59 | } | |
60 | ||
61 | /// Specification for the formatting of an argument in the format string. | |
c34b1796 | 62 | #[derive(Copy, Clone, PartialEq)] |
1a4d82fc JJ |
63 | pub struct FormatSpec<'a> { |
64 | /// Optionally specified character to fill alignment with | |
65 | pub fill: Option<char>, | |
66 | /// Optionally specified alignment | |
67 | pub align: Alignment, | |
68 | /// Packed version of various flags provided | |
c34b1796 | 69 | pub flags: u32, |
1a4d82fc JJ |
70 | /// The integer precision to use |
71 | pub precision: Count<'a>, | |
72 | /// The string width requested for the resulting format | |
73 | pub width: Count<'a>, | |
74 | /// The descriptor string representing the name of the format desired for | |
75 | /// this argument, this can be empty or any number of characters, although | |
76 | /// it is required to be one word. | |
b039eaaf | 77 | pub ty: &'a str, |
1a4d82fc JJ |
78 | } |
79 | ||
80 | /// Enum describing where an argument for a format can be located. | |
c34b1796 | 81 | #[derive(Copy, Clone, PartialEq)] |
1a4d82fc | 82 | pub enum Position<'a> { |
1a4d82fc | 83 | /// The argument is located at a specific index. |
c34b1796 | 84 | ArgumentIs(usize), |
1a4d82fc JJ |
85 | /// The argument has a name. |
86 | ArgumentNamed(&'a str), | |
87 | } | |
88 | ||
89 | /// Enum of alignments which are supported. | |
c34b1796 | 90 | #[derive(Copy, Clone, PartialEq)] |
1a4d82fc JJ |
91 | pub enum Alignment { |
92 | /// The value will be aligned to the left. | |
93 | AlignLeft, | |
94 | /// The value will be aligned to the right. | |
95 | AlignRight, | |
96 | /// The value will be aligned in the center. | |
97 | AlignCenter, | |
98 | /// The value will take on a default alignment. | |
99 | AlignUnknown, | |
100 | } | |
101 | ||
102 | /// Various flags which can be applied to format strings. The meaning of these | |
103 | /// flags is defined by the formatters themselves. | |
c34b1796 | 104 | #[derive(Copy, Clone, PartialEq)] |
1a4d82fc JJ |
105 | pub enum Flag { |
106 | /// A `+` will be used to denote positive numbers. | |
107 | FlagSignPlus, | |
108 | /// A `-` will be used to denote negative numbers. This is the default. | |
109 | FlagSignMinus, | |
110 | /// An alternate form will be used for the value. In the case of numbers, | |
111 | /// this means that the number will be prefixed with the supplied string. | |
112 | FlagAlternate, | |
113 | /// For numbers, this means that the number will be padded with zeroes, | |
114 | /// and the sign (`+` or `-`) will precede them. | |
115 | FlagSignAwareZeroPad, | |
116 | } | |
117 | ||
118 | /// A count is used for the precision and width parameters of an integer, and | |
119 | /// can reference either an argument or a literal integer. | |
c34b1796 | 120 | #[derive(Copy, Clone, PartialEq)] |
1a4d82fc JJ |
121 | pub enum Count<'a> { |
122 | /// The count is specified explicitly. | |
c34b1796 | 123 | CountIs(usize), |
1a4d82fc JJ |
124 | /// The count is specified by the argument with the given name. |
125 | CountIsName(&'a str), | |
126 | /// The count is specified by the argument at the given index. | |
c34b1796 | 127 | CountIsParam(usize), |
1a4d82fc JJ |
128 | /// The count is implied and cannot be explicitly specified. |
129 | CountImplied, | |
130 | } | |
131 | ||
132 | /// The parser structure for interpreting the input format string. This is | |
b039eaaf | 133 | /// modeled as an iterator over `Piece` structures to form a stream of tokens |
1a4d82fc JJ |
134 | /// being output. |
135 | /// | |
136 | /// This is a recursive-descent parser for the sake of simplicity, and if | |
137 | /// necessary there's probably lots of room for improvement performance-wise. | |
138 | pub struct Parser<'a> { | |
139 | input: &'a str, | |
e9174d1e | 140 | cur: iter::Peekable<str::CharIndices<'a>>, |
1a4d82fc JJ |
141 | /// Error messages accumulated during parsing |
142 | pub errors: Vec<string::String>, | |
5bcae85e SL |
143 | /// Current position of implicit positional argument pointer |
144 | curarg: usize, | |
1a4d82fc JJ |
145 | } |
146 | ||
147 | impl<'a> Iterator for Parser<'a> { | |
148 | type Item = Piece<'a>; | |
149 | ||
150 | fn next(&mut self) -> Option<Piece<'a>> { | |
e9174d1e SL |
151 | if let Some(&(pos, c)) = self.cur.peek() { |
152 | match c { | |
153 | '{' => { | |
154 | self.cur.next(); | |
155 | if self.consume('{') { | |
156 | Some(String(self.string(pos + 1))) | |
157 | } else { | |
158 | let ret = Some(NextArgument(self.argument())); | |
159 | self.must_consume('}'); | |
160 | ret | |
161 | } | |
1a4d82fc | 162 | } |
e9174d1e SL |
163 | '}' => { |
164 | self.cur.next(); | |
165 | if self.consume('}') { | |
166 | Some(String(self.string(pos + 1))) | |
167 | } else { | |
168 | self.err("unmatched `}` found"); | |
169 | None | |
170 | } | |
1a4d82fc | 171 | } |
e9174d1e | 172 | _ => Some(String(self.string(pos))), |
1a4d82fc | 173 | } |
e9174d1e SL |
174 | } else { |
175 | None | |
1a4d82fc JJ |
176 | } |
177 | } | |
178 | } | |
179 | ||
180 | impl<'a> Parser<'a> { | |
181 | /// Creates a new parser for the given format string | |
182 | pub fn new(s: &'a str) -> Parser<'a> { | |
183 | Parser { | |
184 | input: s, | |
e9174d1e | 185 | cur: s.char_indices().peekable(), |
92a42be0 | 186 | errors: vec![], |
5bcae85e | 187 | curarg: 0, |
1a4d82fc JJ |
188 | } |
189 | } | |
190 | ||
191 | /// Notifies of an error. The message doesn't actually need to be of type | |
192 | /// String, but I think it does when this eventually uses conditions so it | |
193 | /// might as well start using it now. | |
194 | fn err(&mut self, msg: &str) { | |
e9174d1e | 195 | self.errors.push(msg.to_owned()); |
1a4d82fc JJ |
196 | } |
197 | ||
198 | /// Optionally consumes the specified character. If the character is not at | |
199 | /// the current position, then the current iterator isn't moved and false is | |
200 | /// returned, otherwise the character is consumed and true is returned. | |
201 | fn consume(&mut self, c: char) -> bool { | |
e9174d1e | 202 | if let Some(&(_, maybe)) = self.cur.peek() { |
b039eaaf SL |
203 | if c == maybe { |
204 | self.cur.next(); | |
205 | true | |
206 | } else { | |
207 | false | |
208 | } | |
e9174d1e SL |
209 | } else { |
210 | false | |
1a4d82fc JJ |
211 | } |
212 | } | |
213 | ||
214 | /// Forces consumption of the specified character. If the character is not | |
215 | /// found, an error is emitted. | |
216 | fn must_consume(&mut self, c: char) { | |
217 | self.ws(); | |
e9174d1e SL |
218 | if let Some(&(_, maybe)) = self.cur.peek() { |
219 | if c == maybe { | |
1a4d82fc | 220 | self.cur.next(); |
e9174d1e SL |
221 | } else { |
222 | self.err(&format!("expected `{:?}`, found `{:?}`", c, maybe)); | |
1a4d82fc | 223 | } |
e9174d1e SL |
224 | } else { |
225 | self.err(&format!("expected `{:?}` but string was terminated", c)); | |
1a4d82fc JJ |
226 | } |
227 | } | |
228 | ||
229 | /// Consumes all whitespace characters until the first non-whitespace | |
230 | /// character | |
231 | fn ws(&mut self) { | |
e9174d1e | 232 | while let Some(&(_, c)) = self.cur.peek() { |
b039eaaf SL |
233 | if c.is_whitespace() { |
234 | self.cur.next(); | |
235 | } else { | |
92a42be0 | 236 | break; |
b039eaaf | 237 | } |
1a4d82fc JJ |
238 | } |
239 | } | |
240 | ||
241 | /// Parses all of a string which is to be considered a "raw literal" in a | |
242 | /// format string. This is everything outside of the braces. | |
c34b1796 | 243 | fn string(&mut self, start: usize) -> &'a str { |
e9174d1e SL |
244 | // we may not consume the character, peek the iterator |
245 | while let Some(&(pos, c)) = self.cur.peek() { | |
246 | match c { | |
b039eaaf SL |
247 | '{' | '}' => { |
248 | return &self.input[start..pos]; | |
249 | } | |
250 | _ => { | |
251 | self.cur.next(); | |
252 | } | |
1a4d82fc JJ |
253 | } |
254 | } | |
e9174d1e | 255 | &self.input[start..self.input.len()] |
1a4d82fc JJ |
256 | } |
257 | ||
258 | /// Parses an Argument structure, or what's contained within braces inside | |
259 | /// the format string | |
260 | fn argument(&mut self) -> Argument<'a> { | |
5bcae85e SL |
261 | let pos = self.position(); |
262 | let format = self.format(); | |
263 | ||
264 | // Resolve position after parsing format spec. | |
265 | let pos = match pos { | |
266 | Some(position) => position, | |
267 | None => { | |
268 | let i = self.curarg; | |
269 | self.curarg += 1; | |
270 | ArgumentIs(i) | |
271 | } | |
272 | }; | |
273 | ||
1a4d82fc | 274 | Argument { |
5bcae85e SL |
275 | position: pos, |
276 | format: format, | |
1a4d82fc JJ |
277 | } |
278 | } | |
279 | ||
280 | /// Parses a positional argument for a format. This could either be an | |
281 | /// integer index of an argument, a named argument, or a blank string. | |
5bcae85e SL |
282 | /// Returns `Some(parsed_position)` if the position is not implicitly |
283 | /// consuming a macro argument, `None` if it's the case. | |
284 | fn position(&mut self) -> Option<Position<'a>> { | |
e9174d1e | 285 | if let Some(i) = self.integer() { |
5bcae85e | 286 | Some(ArgumentIs(i)) |
e9174d1e SL |
287 | } else { |
288 | match self.cur.peek() { | |
5bcae85e SL |
289 | Some(&(_, c)) if c.is_alphabetic() => Some(ArgumentNamed(self.word())), |
290 | ||
291 | // This is an `ArgumentNext`. | |
292 | // Record the fact and do the resolution after parsing the | |
293 | // format spec, to make things like `{:.*}` work. | |
294 | _ => None, | |
1a4d82fc JJ |
295 | } |
296 | } | |
297 | } | |
298 | ||
299 | /// Parses a format specifier at the current position, returning all of the | |
300 | /// relevant information in the FormatSpec struct. | |
301 | fn format(&mut self) -> FormatSpec<'a> { | |
302 | let mut spec = FormatSpec { | |
303 | fill: None, | |
304 | align: AlignUnknown, | |
305 | flags: 0, | |
306 | precision: CountImplied, | |
307 | width: CountImplied, | |
85aaf69f | 308 | ty: &self.input[..0], |
1a4d82fc | 309 | }; |
b039eaaf | 310 | if !self.consume(':') { |
92a42be0 | 311 | return spec; |
b039eaaf | 312 | } |
1a4d82fc JJ |
313 | |
314 | // fill character | |
e9174d1e SL |
315 | if let Some(&(_, c)) = self.cur.peek() { |
316 | match self.cur.clone().skip(1).next() { | |
317 | Some((_, '>')) | Some((_, '<')) | Some((_, '^')) => { | |
318 | spec.fill = Some(c); | |
319 | self.cur.next(); | |
1a4d82fc | 320 | } |
e9174d1e | 321 | _ => {} |
1a4d82fc | 322 | } |
1a4d82fc JJ |
323 | } |
324 | // Alignment | |
325 | if self.consume('<') { | |
326 | spec.align = AlignLeft; | |
327 | } else if self.consume('>') { | |
328 | spec.align = AlignRight; | |
329 | } else if self.consume('^') { | |
330 | spec.align = AlignCenter; | |
331 | } | |
332 | // Sign flags | |
333 | if self.consume('+') { | |
c34b1796 | 334 | spec.flags |= 1 << (FlagSignPlus as u32); |
1a4d82fc | 335 | } else if self.consume('-') { |
c34b1796 | 336 | spec.flags |= 1 << (FlagSignMinus as u32); |
1a4d82fc JJ |
337 | } |
338 | // Alternate marker | |
339 | if self.consume('#') { | |
c34b1796 | 340 | spec.flags |= 1 << (FlagAlternate as u32); |
1a4d82fc JJ |
341 | } |
342 | // Width and precision | |
343 | let mut havewidth = false; | |
344 | if self.consume('0') { | |
345 | // small ambiguity with '0$' as a format string. In theory this is a | |
346 | // '0' flag and then an ill-formatted format string with just a '$' | |
347 | // and no count, but this is better if we instead interpret this as | |
348 | // no '0' flag and '0$' as the width instead. | |
349 | if self.consume('$') { | |
350 | spec.width = CountIsParam(0); | |
351 | havewidth = true; | |
352 | } else { | |
c34b1796 | 353 | spec.flags |= 1 << (FlagSignAwareZeroPad as u32); |
1a4d82fc JJ |
354 | } |
355 | } | |
356 | if !havewidth { | |
357 | spec.width = self.count(); | |
358 | } | |
359 | if self.consume('.') { | |
360 | if self.consume('*') { | |
5bcae85e SL |
361 | // Resolve `CountIsNextParam`. |
362 | // We can do this immediately as `position` is resolved later. | |
363 | let i = self.curarg; | |
364 | self.curarg += 1; | |
365 | spec.precision = CountIsParam(i); | |
1a4d82fc JJ |
366 | } else { |
367 | spec.precision = self.count(); | |
368 | } | |
369 | } | |
370 | // Finally the actual format specifier | |
371 | if self.consume('?') { | |
372 | spec.ty = "?"; | |
373 | } else { | |
374 | spec.ty = self.word(); | |
375 | } | |
e9174d1e | 376 | spec |
1a4d82fc JJ |
377 | } |
378 | ||
379 | /// Parses a Count parameter at the current position. This does not check | |
380 | /// for 'CountIsNextParam' because that is only used in precision, not | |
381 | /// width. | |
382 | fn count(&mut self) -> Count<'a> { | |
e9174d1e | 383 | if let Some(i) = self.integer() { |
b039eaaf SL |
384 | if self.consume('$') { |
385 | CountIsParam(i) | |
386 | } else { | |
387 | CountIs(i) | |
388 | } | |
e9174d1e SL |
389 | } else { |
390 | let tmp = self.cur.clone(); | |
391 | let word = self.word(); | |
392 | if word.is_empty() { | |
393 | self.cur = tmp; | |
394 | CountImplied | |
395 | } else { | |
1a4d82fc | 396 | if self.consume('$') { |
e9174d1e | 397 | CountIsName(word) |
1a4d82fc | 398 | } else { |
e9174d1e SL |
399 | self.cur = tmp; |
400 | CountImplied | |
1a4d82fc JJ |
401 | } |
402 | } | |
403 | } | |
404 | } | |
405 | ||
406 | /// Parses a word starting at the current position. A word is considered to | |
407 | /// be an alphabetic character followed by any number of alphanumeric | |
408 | /// characters. | |
409 | fn word(&mut self) -> &'a str { | |
e9174d1e | 410 | let start = match self.cur.peek() { |
b039eaaf SL |
411 | Some(&(pos, c)) if c.is_xid_start() => { |
412 | self.cur.next(); | |
413 | pos | |
414 | } | |
415 | _ => { | |
416 | return &self.input[..0]; | |
417 | } | |
1a4d82fc | 418 | }; |
e9174d1e SL |
419 | while let Some(&(pos, c)) = self.cur.peek() { |
420 | if c.is_xid_continue() { | |
421 | self.cur.next(); | |
422 | } else { | |
423 | return &self.input[start..pos]; | |
1a4d82fc JJ |
424 | } |
425 | } | |
e9174d1e | 426 | &self.input[start..self.input.len()] |
1a4d82fc JJ |
427 | } |
428 | ||
429 | /// Optionally parses an integer at the current position. This doesn't deal | |
430 | /// with overflow at all, it's just accumulating digits. | |
c34b1796 | 431 | fn integer(&mut self) -> Option<usize> { |
1a4d82fc JJ |
432 | let mut cur = 0; |
433 | let mut found = false; | |
e9174d1e SL |
434 | while let Some(&(_, c)) = self.cur.peek() { |
435 | if let Some(i) = c.to_digit(10) { | |
436 | cur = cur * 10 + i as usize; | |
437 | found = true; | |
438 | self.cur.next(); | |
439 | } else { | |
92a42be0 | 440 | break; |
1a4d82fc JJ |
441 | } |
442 | } | |
b039eaaf SL |
443 | if found { |
444 | Some(cur) | |
445 | } else { | |
446 | None | |
447 | } | |
1a4d82fc JJ |
448 | } |
449 | } | |
450 | ||
451 | #[cfg(test)] | |
452 | mod tests { | |
453 | use super::*; | |
454 | ||
455 | fn same(fmt: &'static str, p: &[Piece<'static>]) { | |
85aaf69f | 456 | let parser = Parser::new(fmt); |
c34b1796 | 457 | assert!(parser.collect::<Vec<Piece<'static>>>() == p); |
1a4d82fc JJ |
458 | } |
459 | ||
460 | fn fmtdflt() -> FormatSpec<'static> { | |
461 | return FormatSpec { | |
462 | fill: None, | |
463 | align: AlignUnknown, | |
464 | flags: 0, | |
465 | precision: CountImplied, | |
466 | width: CountImplied, | |
467 | ty: "", | |
92a42be0 | 468 | }; |
1a4d82fc JJ |
469 | } |
470 | ||
471 | fn musterr(s: &str) { | |
472 | let mut p = Parser::new(s); | |
473 | p.next(); | |
9346a6ac | 474 | assert!(!p.errors.is_empty()); |
1a4d82fc JJ |
475 | } |
476 | ||
477 | #[test] | |
478 | fn simple() { | |
479 | same("asdf", &[String("asdf")]); | |
480 | same("a{{b", &[String("a"), String("{b")]); | |
481 | same("a}}b", &[String("a"), String("}b")]); | |
482 | same("a}}", &[String("a"), String("}")]); | |
483 | same("}}", &[String("}")]); | |
484 | same("\\}}", &[String("\\"), String("}")]); | |
485 | } | |
486 | ||
b039eaaf SL |
487 | #[test] |
488 | fn invalid01() { | |
489 | musterr("{") | |
490 | } | |
491 | #[test] | |
492 | fn invalid02() { | |
493 | musterr("}") | |
494 | } | |
495 | #[test] | |
496 | fn invalid04() { | |
497 | musterr("{3a}") | |
498 | } | |
499 | #[test] | |
500 | fn invalid05() { | |
501 | musterr("{:|}") | |
502 | } | |
503 | #[test] | |
504 | fn invalid06() { | |
505 | musterr("{:>>>}") | |
506 | } | |
1a4d82fc JJ |
507 | |
508 | #[test] | |
509 | fn format_nothing() { | |
b039eaaf SL |
510 | same("{}", |
511 | &[NextArgument(Argument { | |
5bcae85e | 512 | position: ArgumentIs(0), |
b039eaaf SL |
513 | format: fmtdflt(), |
514 | })]); | |
1a4d82fc JJ |
515 | } |
516 | #[test] | |
517 | fn format_position() { | |
b039eaaf SL |
518 | same("{3}", |
519 | &[NextArgument(Argument { | |
520 | position: ArgumentIs(3), | |
521 | format: fmtdflt(), | |
522 | })]); | |
1a4d82fc JJ |
523 | } |
524 | #[test] | |
525 | fn format_position_nothing_else() { | |
b039eaaf SL |
526 | same("{3:}", |
527 | &[NextArgument(Argument { | |
528 | position: ArgumentIs(3), | |
529 | format: fmtdflt(), | |
530 | })]); | |
1a4d82fc JJ |
531 | } |
532 | #[test] | |
533 | fn format_type() { | |
b039eaaf SL |
534 | same("{3:a}", |
535 | &[NextArgument(Argument { | |
536 | position: ArgumentIs(3), | |
537 | format: FormatSpec { | |
538 | fill: None, | |
539 | align: AlignUnknown, | |
540 | flags: 0, | |
541 | precision: CountImplied, | |
542 | width: CountImplied, | |
543 | ty: "a", | |
544 | }, | |
545 | })]); | |
1a4d82fc JJ |
546 | } |
547 | #[test] | |
548 | fn format_align_fill() { | |
b039eaaf SL |
549 | same("{3:>}", |
550 | &[NextArgument(Argument { | |
551 | position: ArgumentIs(3), | |
552 | format: FormatSpec { | |
553 | fill: None, | |
554 | align: AlignRight, | |
555 | flags: 0, | |
556 | precision: CountImplied, | |
557 | width: CountImplied, | |
558 | ty: "", | |
559 | }, | |
560 | })]); | |
561 | same("{3:0<}", | |
562 | &[NextArgument(Argument { | |
563 | position: ArgumentIs(3), | |
564 | format: FormatSpec { | |
565 | fill: Some('0'), | |
566 | align: AlignLeft, | |
567 | flags: 0, | |
568 | precision: CountImplied, | |
569 | width: CountImplied, | |
570 | ty: "", | |
571 | }, | |
572 | })]); | |
573 | same("{3:*<abcd}", | |
574 | &[NextArgument(Argument { | |
575 | position: ArgumentIs(3), | |
576 | format: FormatSpec { | |
577 | fill: Some('*'), | |
578 | align: AlignLeft, | |
579 | flags: 0, | |
580 | precision: CountImplied, | |
581 | width: CountImplied, | |
582 | ty: "abcd", | |
583 | }, | |
584 | })]); | |
1a4d82fc JJ |
585 | } |
586 | #[test] | |
587 | fn format_counts() { | |
b039eaaf SL |
588 | same("{:10s}", |
589 | &[NextArgument(Argument { | |
5bcae85e | 590 | position: ArgumentIs(0), |
b039eaaf SL |
591 | format: FormatSpec { |
592 | fill: None, | |
593 | align: AlignUnknown, | |
594 | flags: 0, | |
595 | precision: CountImplied, | |
596 | width: CountIs(10), | |
597 | ty: "s", | |
598 | }, | |
599 | })]); | |
600 | same("{:10$.10s}", | |
601 | &[NextArgument(Argument { | |
5bcae85e | 602 | position: ArgumentIs(0), |
b039eaaf SL |
603 | format: FormatSpec { |
604 | fill: None, | |
605 | align: AlignUnknown, | |
606 | flags: 0, | |
607 | precision: CountIs(10), | |
608 | width: CountIsParam(10), | |
609 | ty: "s", | |
610 | }, | |
611 | })]); | |
612 | same("{:.*s}", | |
613 | &[NextArgument(Argument { | |
5bcae85e | 614 | position: ArgumentIs(1), |
b039eaaf SL |
615 | format: FormatSpec { |
616 | fill: None, | |
617 | align: AlignUnknown, | |
618 | flags: 0, | |
5bcae85e | 619 | precision: CountIsParam(0), |
b039eaaf SL |
620 | width: CountImplied, |
621 | ty: "s", | |
622 | }, | |
623 | })]); | |
624 | same("{:.10$s}", | |
625 | &[NextArgument(Argument { | |
5bcae85e | 626 | position: ArgumentIs(0), |
b039eaaf SL |
627 | format: FormatSpec { |
628 | fill: None, | |
629 | align: AlignUnknown, | |
630 | flags: 0, | |
631 | precision: CountIsParam(10), | |
632 | width: CountImplied, | |
633 | ty: "s", | |
634 | }, | |
635 | })]); | |
636 | same("{:a$.b$s}", | |
637 | &[NextArgument(Argument { | |
5bcae85e | 638 | position: ArgumentIs(0), |
b039eaaf SL |
639 | format: FormatSpec { |
640 | fill: None, | |
641 | align: AlignUnknown, | |
642 | flags: 0, | |
643 | precision: CountIsName("b"), | |
644 | width: CountIsName("a"), | |
645 | ty: "s", | |
646 | }, | |
647 | })]); | |
1a4d82fc JJ |
648 | } |
649 | #[test] | |
650 | fn format_flags() { | |
b039eaaf SL |
651 | same("{:-}", |
652 | &[NextArgument(Argument { | |
5bcae85e | 653 | position: ArgumentIs(0), |
b039eaaf SL |
654 | format: FormatSpec { |
655 | fill: None, | |
656 | align: AlignUnknown, | |
657 | flags: (1 << FlagSignMinus as u32), | |
658 | precision: CountImplied, | |
659 | width: CountImplied, | |
660 | ty: "", | |
661 | }, | |
662 | })]); | |
663 | same("{:+#}", | |
664 | &[NextArgument(Argument { | |
5bcae85e | 665 | position: ArgumentIs(0), |
b039eaaf SL |
666 | format: FormatSpec { |
667 | fill: None, | |
668 | align: AlignUnknown, | |
669 | flags: (1 << FlagSignPlus as u32) | (1 << FlagAlternate as u32), | |
670 | precision: CountImplied, | |
671 | width: CountImplied, | |
672 | ty: "", | |
673 | }, | |
674 | })]); | |
1a4d82fc JJ |
675 | } |
676 | #[test] | |
677 | fn format_mixture() { | |
b039eaaf SL |
678 | same("abcd {3:a} efg", |
679 | &[String("abcd "), | |
680 | NextArgument(Argument { | |
681 | position: ArgumentIs(3), | |
682 | format: FormatSpec { | |
683 | fill: None, | |
684 | align: AlignUnknown, | |
685 | flags: 0, | |
686 | precision: CountImplied, | |
687 | width: CountImplied, | |
688 | ty: "a", | |
689 | }, | |
690 | }), | |
691 | String(" efg")]); | |
1a4d82fc JJ |
692 | } |
693 | } |