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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 | ||
e9174d1e | 17 | #![doc(html_logo_url = "https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png", |
62682a34 | 18 | html_favicon_url = "https://doc.rust-lang.org/favicon.ico", |
e9174d1e | 19 | html_root_url = "https://doc.rust-lang.org/nightly/", |
92a42be0 SL |
20 | html_playground_url = "https://play.rust-lang.org/", |
21 | test(attr(deny(warnings))))] | |
32a655c1 | 22 | #![deny(warnings)] |
1a4d82fc | 23 | |
1a4d82fc JJ |
24 | pub use self::Piece::*; |
25 | pub use self::Position::*; | |
26 | pub use self::Alignment::*; | |
27 | pub use self::Flag::*; | |
28 | pub use self::Count::*; | |
29 | ||
30 | use std::str; | |
31 | use std::string; | |
e9174d1e | 32 | use std::iter; |
1a4d82fc JJ |
33 | |
34 | /// A piece is a portion of the format string which represents the next part | |
35 | /// to emit. These are emitted as a stream by the `Parser` class. | |
c34b1796 | 36 | #[derive(Copy, Clone, PartialEq)] |
1a4d82fc JJ |
37 | pub enum Piece<'a> { |
38 | /// A literal string which should directly be emitted | |
39 | String(&'a str), | |
40 | /// This describes that formatting should process the next argument (as | |
41 | /// specified inside) for emission. | |
42 | NextArgument(Argument<'a>), | |
43 | } | |
44 | ||
45 | /// Representation of an argument specification. | |
c34b1796 | 46 | #[derive(Copy, Clone, PartialEq)] |
1a4d82fc JJ |
47 | pub struct Argument<'a> { |
48 | /// Where to find this argument | |
49 | pub position: Position<'a>, | |
50 | /// How to format the argument | |
51 | pub format: FormatSpec<'a>, | |
52 | } | |
53 | ||
54 | /// Specification for the formatting of an argument in the format string. | |
c34b1796 | 55 | #[derive(Copy, Clone, PartialEq)] |
1a4d82fc JJ |
56 | pub struct FormatSpec<'a> { |
57 | /// Optionally specified character to fill alignment with | |
58 | pub fill: Option<char>, | |
59 | /// Optionally specified alignment | |
60 | pub align: Alignment, | |
61 | /// Packed version of various flags provided | |
c34b1796 | 62 | pub flags: u32, |
1a4d82fc JJ |
63 | /// The integer precision to use |
64 | pub precision: Count<'a>, | |
65 | /// The string width requested for the resulting format | |
66 | pub width: Count<'a>, | |
67 | /// The descriptor string representing the name of the format desired for | |
68 | /// this argument, this can be empty or any number of characters, although | |
69 | /// it is required to be one word. | |
b039eaaf | 70 | pub ty: &'a str, |
1a4d82fc JJ |
71 | } |
72 | ||
73 | /// Enum describing where an argument for a format can be located. | |
c34b1796 | 74 | #[derive(Copy, Clone, PartialEq)] |
1a4d82fc | 75 | pub enum Position<'a> { |
abe05a73 XL |
76 | /// The arugment is implied to be located at an index |
77 | ArgumentImplicitlyIs(usize), | |
78 | /// The argument is located at a specific index given in the format | |
c34b1796 | 79 | ArgumentIs(usize), |
1a4d82fc JJ |
80 | /// The argument has a name. |
81 | ArgumentNamed(&'a str), | |
82 | } | |
83 | ||
84 | /// Enum of alignments which are supported. | |
c34b1796 | 85 | #[derive(Copy, Clone, PartialEq)] |
1a4d82fc JJ |
86 | pub enum Alignment { |
87 | /// The value will be aligned to the left. | |
88 | AlignLeft, | |
89 | /// The value will be aligned to the right. | |
90 | AlignRight, | |
91 | /// The value will be aligned in the center. | |
92 | AlignCenter, | |
93 | /// The value will take on a default alignment. | |
94 | AlignUnknown, | |
95 | } | |
96 | ||
97 | /// Various flags which can be applied to format strings. The meaning of these | |
98 | /// flags is defined by the formatters themselves. | |
c34b1796 | 99 | #[derive(Copy, Clone, PartialEq)] |
1a4d82fc JJ |
100 | pub enum Flag { |
101 | /// A `+` will be used to denote positive numbers. | |
102 | FlagSignPlus, | |
103 | /// A `-` will be used to denote negative numbers. This is the default. | |
104 | FlagSignMinus, | |
105 | /// An alternate form will be used for the value. In the case of numbers, | |
106 | /// this means that the number will be prefixed with the supplied string. | |
107 | FlagAlternate, | |
108 | /// For numbers, this means that the number will be padded with zeroes, | |
109 | /// and the sign (`+` or `-`) will precede them. | |
110 | FlagSignAwareZeroPad, | |
111 | } | |
112 | ||
113 | /// A count is used for the precision and width parameters of an integer, and | |
114 | /// can reference either an argument or a literal integer. | |
c34b1796 | 115 | #[derive(Copy, Clone, PartialEq)] |
1a4d82fc JJ |
116 | pub enum Count<'a> { |
117 | /// The count is specified explicitly. | |
c34b1796 | 118 | CountIs(usize), |
1a4d82fc JJ |
119 | /// The count is specified by the argument with the given name. |
120 | CountIsName(&'a str), | |
121 | /// The count is specified by the argument at the given index. | |
c34b1796 | 122 | CountIsParam(usize), |
1a4d82fc JJ |
123 | /// The count is implied and cannot be explicitly specified. |
124 | CountImplied, | |
125 | } | |
126 | ||
127 | /// The parser structure for interpreting the input format string. This is | |
b039eaaf | 128 | /// modeled as an iterator over `Piece` structures to form a stream of tokens |
1a4d82fc JJ |
129 | /// being output. |
130 | /// | |
131 | /// This is a recursive-descent parser for the sake of simplicity, and if | |
132 | /// necessary there's probably lots of room for improvement performance-wise. | |
133 | pub struct Parser<'a> { | |
134 | input: &'a str, | |
e9174d1e | 135 | cur: iter::Peekable<str::CharIndices<'a>>, |
1a4d82fc | 136 | /// Error messages accumulated during parsing |
476ff2be | 137 | pub errors: Vec<(string::String, Option<string::String>)>, |
5bcae85e SL |
138 | /// Current position of implicit positional argument pointer |
139 | curarg: usize, | |
1a4d82fc JJ |
140 | } |
141 | ||
142 | impl<'a> Iterator for Parser<'a> { | |
143 | type Item = Piece<'a>; | |
144 | ||
145 | fn next(&mut self) -> Option<Piece<'a>> { | |
e9174d1e SL |
146 | if let Some(&(pos, c)) = self.cur.peek() { |
147 | match c { | |
148 | '{' => { | |
149 | self.cur.next(); | |
150 | if self.consume('{') { | |
151 | Some(String(self.string(pos + 1))) | |
152 | } else { | |
153 | let ret = Some(NextArgument(self.argument())); | |
154 | self.must_consume('}'); | |
155 | ret | |
156 | } | |
1a4d82fc | 157 | } |
e9174d1e SL |
158 | '}' => { |
159 | self.cur.next(); | |
160 | if self.consume('}') { | |
161 | Some(String(self.string(pos + 1))) | |
162 | } else { | |
476ff2be SL |
163 | self.err_with_note("unmatched `}` found", |
164 | "if you intended to print `}`, \ | |
165 | you can escape it using `}}`"); | |
e9174d1e SL |
166 | None |
167 | } | |
1a4d82fc | 168 | } |
e9174d1e | 169 | _ => Some(String(self.string(pos))), |
1a4d82fc | 170 | } |
e9174d1e SL |
171 | } else { |
172 | None | |
1a4d82fc JJ |
173 | } |
174 | } | |
175 | } | |
176 | ||
177 | impl<'a> Parser<'a> { | |
178 | /// Creates a new parser for the given format string | |
179 | pub fn new(s: &'a str) -> Parser<'a> { | |
180 | Parser { | |
181 | input: s, | |
e9174d1e | 182 | cur: s.char_indices().peekable(), |
92a42be0 | 183 | errors: vec![], |
5bcae85e | 184 | curarg: 0, |
1a4d82fc JJ |
185 | } |
186 | } | |
187 | ||
188 | /// Notifies of an error. The message doesn't actually need to be of type | |
189 | /// String, but I think it does when this eventually uses conditions so it | |
190 | /// might as well start using it now. | |
191 | fn err(&mut self, msg: &str) { | |
476ff2be SL |
192 | self.errors.push((msg.to_owned(), None)); |
193 | } | |
194 | ||
195 | /// Notifies of an error. The message doesn't actually need to be of type | |
196 | /// String, but I think it does when this eventually uses conditions so it | |
197 | /// might as well start using it now. | |
198 | fn err_with_note(&mut self, msg: &str, note: &str) { | |
199 | self.errors.push((msg.to_owned(), Some(note.to_owned()))); | |
1a4d82fc JJ |
200 | } |
201 | ||
202 | /// Optionally consumes the specified character. If the character is not at | |
203 | /// the current position, then the current iterator isn't moved and false is | |
204 | /// returned, otherwise the character is consumed and true is returned. | |
205 | fn consume(&mut self, c: char) -> bool { | |
e9174d1e | 206 | if let Some(&(_, maybe)) = self.cur.peek() { |
b039eaaf SL |
207 | if c == maybe { |
208 | self.cur.next(); | |
209 | true | |
210 | } else { | |
211 | false | |
212 | } | |
e9174d1e SL |
213 | } else { |
214 | false | |
1a4d82fc JJ |
215 | } |
216 | } | |
217 | ||
218 | /// Forces consumption of the specified character. If the character is not | |
219 | /// found, an error is emitted. | |
220 | fn must_consume(&mut self, c: char) { | |
221 | self.ws(); | |
e9174d1e SL |
222 | if let Some(&(_, maybe)) = self.cur.peek() { |
223 | if c == maybe { | |
1a4d82fc | 224 | self.cur.next(); |
e9174d1e SL |
225 | } else { |
226 | self.err(&format!("expected `{:?}`, found `{:?}`", c, maybe)); | |
1a4d82fc | 227 | } |
e9174d1e | 228 | } else { |
476ff2be SL |
229 | let msg = &format!("expected `{:?}` but string was terminated", c); |
230 | if c == '}' { | |
231 | self.err_with_note(msg, | |
232 | "if you intended to print `{`, you can escape it using `{{`"); | |
233 | } else { | |
234 | self.err(msg); | |
235 | } | |
1a4d82fc JJ |
236 | } |
237 | } | |
238 | ||
239 | /// Consumes all whitespace characters until the first non-whitespace | |
240 | /// character | |
241 | fn ws(&mut self) { | |
e9174d1e | 242 | while let Some(&(_, c)) = self.cur.peek() { |
b039eaaf SL |
243 | if c.is_whitespace() { |
244 | self.cur.next(); | |
245 | } else { | |
92a42be0 | 246 | break; |
b039eaaf | 247 | } |
1a4d82fc JJ |
248 | } |
249 | } | |
250 | ||
251 | /// Parses all of a string which is to be considered a "raw literal" in a | |
252 | /// format string. This is everything outside of the braces. | |
c34b1796 | 253 | fn string(&mut self, start: usize) -> &'a str { |
e9174d1e SL |
254 | // we may not consume the character, peek the iterator |
255 | while let Some(&(pos, c)) = self.cur.peek() { | |
256 | match c { | |
b039eaaf SL |
257 | '{' | '}' => { |
258 | return &self.input[start..pos]; | |
259 | } | |
260 | _ => { | |
261 | self.cur.next(); | |
262 | } | |
1a4d82fc JJ |
263 | } |
264 | } | |
e9174d1e | 265 | &self.input[start..self.input.len()] |
1a4d82fc JJ |
266 | } |
267 | ||
268 | /// Parses an Argument structure, or what's contained within braces inside | |
269 | /// the format string | |
270 | fn argument(&mut self) -> Argument<'a> { | |
5bcae85e SL |
271 | let pos = self.position(); |
272 | let format = self.format(); | |
273 | ||
274 | // Resolve position after parsing format spec. | |
275 | let pos = match pos { | |
276 | Some(position) => position, | |
277 | None => { | |
278 | let i = self.curarg; | |
279 | self.curarg += 1; | |
abe05a73 | 280 | ArgumentImplicitlyIs(i) |
5bcae85e SL |
281 | } |
282 | }; | |
283 | ||
1a4d82fc | 284 | Argument { |
5bcae85e | 285 | position: pos, |
3b2f2976 | 286 | format, |
1a4d82fc JJ |
287 | } |
288 | } | |
289 | ||
290 | /// Parses a positional argument for a format. This could either be an | |
291 | /// integer index of an argument, a named argument, or a blank string. | |
5bcae85e SL |
292 | /// Returns `Some(parsed_position)` if the position is not implicitly |
293 | /// consuming a macro argument, `None` if it's the case. | |
294 | fn position(&mut self) -> Option<Position<'a>> { | |
e9174d1e | 295 | if let Some(i) = self.integer() { |
5bcae85e | 296 | Some(ArgumentIs(i)) |
e9174d1e SL |
297 | } else { |
298 | match self.cur.peek() { | |
5bcae85e SL |
299 | Some(&(_, c)) if c.is_alphabetic() => Some(ArgumentNamed(self.word())), |
300 | ||
301 | // This is an `ArgumentNext`. | |
302 | // Record the fact and do the resolution after parsing the | |
303 | // format spec, to make things like `{:.*}` work. | |
304 | _ => None, | |
1a4d82fc JJ |
305 | } |
306 | } | |
307 | } | |
308 | ||
309 | /// Parses a format specifier at the current position, returning all of the | |
310 | /// relevant information in the FormatSpec struct. | |
311 | fn format(&mut self) -> FormatSpec<'a> { | |
312 | let mut spec = FormatSpec { | |
313 | fill: None, | |
314 | align: AlignUnknown, | |
315 | flags: 0, | |
316 | precision: CountImplied, | |
317 | width: CountImplied, | |
85aaf69f | 318 | ty: &self.input[..0], |
1a4d82fc | 319 | }; |
b039eaaf | 320 | if !self.consume(':') { |
92a42be0 | 321 | return spec; |
b039eaaf | 322 | } |
1a4d82fc JJ |
323 | |
324 | // fill character | |
e9174d1e SL |
325 | if let Some(&(_, c)) = self.cur.peek() { |
326 | match self.cur.clone().skip(1).next() { | |
327 | Some((_, '>')) | Some((_, '<')) | Some((_, '^')) => { | |
328 | spec.fill = Some(c); | |
329 | self.cur.next(); | |
1a4d82fc | 330 | } |
e9174d1e | 331 | _ => {} |
1a4d82fc | 332 | } |
1a4d82fc JJ |
333 | } |
334 | // Alignment | |
335 | if self.consume('<') { | |
336 | spec.align = AlignLeft; | |
337 | } else if self.consume('>') { | |
338 | spec.align = AlignRight; | |
339 | } else if self.consume('^') { | |
340 | spec.align = AlignCenter; | |
341 | } | |
342 | // Sign flags | |
343 | if self.consume('+') { | |
c34b1796 | 344 | spec.flags |= 1 << (FlagSignPlus as u32); |
1a4d82fc | 345 | } else if self.consume('-') { |
c34b1796 | 346 | spec.flags |= 1 << (FlagSignMinus as u32); |
1a4d82fc JJ |
347 | } |
348 | // Alternate marker | |
349 | if self.consume('#') { | |
c34b1796 | 350 | spec.flags |= 1 << (FlagAlternate as u32); |
1a4d82fc JJ |
351 | } |
352 | // Width and precision | |
353 | let mut havewidth = false; | |
354 | if self.consume('0') { | |
355 | // small ambiguity with '0$' as a format string. In theory this is a | |
356 | // '0' flag and then an ill-formatted format string with just a '$' | |
357 | // and no count, but this is better if we instead interpret this as | |
358 | // no '0' flag and '0$' as the width instead. | |
359 | if self.consume('$') { | |
360 | spec.width = CountIsParam(0); | |
361 | havewidth = true; | |
362 | } else { | |
c34b1796 | 363 | spec.flags |= 1 << (FlagSignAwareZeroPad as u32); |
1a4d82fc JJ |
364 | } |
365 | } | |
366 | if !havewidth { | |
367 | spec.width = self.count(); | |
368 | } | |
369 | if self.consume('.') { | |
370 | if self.consume('*') { | |
5bcae85e SL |
371 | // Resolve `CountIsNextParam`. |
372 | // We can do this immediately as `position` is resolved later. | |
373 | let i = self.curarg; | |
374 | self.curarg += 1; | |
375 | spec.precision = CountIsParam(i); | |
1a4d82fc JJ |
376 | } else { |
377 | spec.precision = self.count(); | |
378 | } | |
379 | } | |
380 | // Finally the actual format specifier | |
381 | if self.consume('?') { | |
382 | spec.ty = "?"; | |
383 | } else { | |
384 | spec.ty = self.word(); | |
385 | } | |
e9174d1e | 386 | spec |
1a4d82fc JJ |
387 | } |
388 | ||
389 | /// Parses a Count parameter at the current position. This does not check | |
390 | /// for 'CountIsNextParam' because that is only used in precision, not | |
391 | /// width. | |
392 | fn count(&mut self) -> Count<'a> { | |
e9174d1e | 393 | if let Some(i) = self.integer() { |
b039eaaf SL |
394 | if self.consume('$') { |
395 | CountIsParam(i) | |
396 | } else { | |
397 | CountIs(i) | |
398 | } | |
e9174d1e SL |
399 | } else { |
400 | let tmp = self.cur.clone(); | |
401 | let word = self.word(); | |
402 | if word.is_empty() { | |
403 | self.cur = tmp; | |
404 | CountImplied | |
405 | } else { | |
1a4d82fc | 406 | if self.consume('$') { |
e9174d1e | 407 | CountIsName(word) |
1a4d82fc | 408 | } else { |
e9174d1e SL |
409 | self.cur = tmp; |
410 | CountImplied | |
1a4d82fc JJ |
411 | } |
412 | } | |
413 | } | |
414 | } | |
415 | ||
416 | /// Parses a word starting at the current position. A word is considered to | |
417 | /// be an alphabetic character followed by any number of alphanumeric | |
418 | /// characters. | |
419 | fn word(&mut self) -> &'a str { | |
e9174d1e | 420 | let start = match self.cur.peek() { |
b039eaaf SL |
421 | Some(&(pos, c)) if c.is_xid_start() => { |
422 | self.cur.next(); | |
423 | pos | |
424 | } | |
425 | _ => { | |
426 | return &self.input[..0]; | |
427 | } | |
1a4d82fc | 428 | }; |
e9174d1e SL |
429 | while let Some(&(pos, c)) = self.cur.peek() { |
430 | if c.is_xid_continue() { | |
431 | self.cur.next(); | |
432 | } else { | |
433 | return &self.input[start..pos]; | |
1a4d82fc JJ |
434 | } |
435 | } | |
e9174d1e | 436 | &self.input[start..self.input.len()] |
1a4d82fc JJ |
437 | } |
438 | ||
439 | /// Optionally parses an integer at the current position. This doesn't deal | |
440 | /// with overflow at all, it's just accumulating digits. | |
c34b1796 | 441 | fn integer(&mut self) -> Option<usize> { |
1a4d82fc JJ |
442 | let mut cur = 0; |
443 | let mut found = false; | |
e9174d1e SL |
444 | while let Some(&(_, c)) = self.cur.peek() { |
445 | if let Some(i) = c.to_digit(10) { | |
446 | cur = cur * 10 + i as usize; | |
447 | found = true; | |
448 | self.cur.next(); | |
449 | } else { | |
92a42be0 | 450 | break; |
1a4d82fc JJ |
451 | } |
452 | } | |
b039eaaf SL |
453 | if found { |
454 | Some(cur) | |
455 | } else { | |
456 | None | |
457 | } | |
1a4d82fc JJ |
458 | } |
459 | } | |
460 | ||
461 | #[cfg(test)] | |
462 | mod tests { | |
463 | use super::*; | |
464 | ||
465 | fn same(fmt: &'static str, p: &[Piece<'static>]) { | |
85aaf69f | 466 | let parser = Parser::new(fmt); |
c34b1796 | 467 | assert!(parser.collect::<Vec<Piece<'static>>>() == p); |
1a4d82fc JJ |
468 | } |
469 | ||
470 | fn fmtdflt() -> FormatSpec<'static> { | |
471 | return FormatSpec { | |
472 | fill: None, | |
473 | align: AlignUnknown, | |
474 | flags: 0, | |
475 | precision: CountImplied, | |
476 | width: CountImplied, | |
477 | ty: "", | |
92a42be0 | 478 | }; |
1a4d82fc JJ |
479 | } |
480 | ||
481 | fn musterr(s: &str) { | |
482 | let mut p = Parser::new(s); | |
483 | p.next(); | |
9346a6ac | 484 | assert!(!p.errors.is_empty()); |
1a4d82fc JJ |
485 | } |
486 | ||
487 | #[test] | |
488 | fn simple() { | |
489 | same("asdf", &[String("asdf")]); | |
490 | same("a{{b", &[String("a"), String("{b")]); | |
491 | same("a}}b", &[String("a"), String("}b")]); | |
492 | same("a}}", &[String("a"), String("}")]); | |
493 | same("}}", &[String("}")]); | |
494 | same("\\}}", &[String("\\"), String("}")]); | |
495 | } | |
496 | ||
b039eaaf SL |
497 | #[test] |
498 | fn invalid01() { | |
499 | musterr("{") | |
500 | } | |
501 | #[test] | |
502 | fn invalid02() { | |
503 | musterr("}") | |
504 | } | |
505 | #[test] | |
506 | fn invalid04() { | |
507 | musterr("{3a}") | |
508 | } | |
509 | #[test] | |
510 | fn invalid05() { | |
511 | musterr("{:|}") | |
512 | } | |
513 | #[test] | |
514 | fn invalid06() { | |
515 | musterr("{:>>>}") | |
516 | } | |
1a4d82fc JJ |
517 | |
518 | #[test] | |
519 | fn format_nothing() { | |
b039eaaf SL |
520 | same("{}", |
521 | &[NextArgument(Argument { | |
abe05a73 | 522 | position: ArgumentImplicitlyIs(0), |
b039eaaf SL |
523 | format: fmtdflt(), |
524 | })]); | |
1a4d82fc JJ |
525 | } |
526 | #[test] | |
527 | fn format_position() { | |
b039eaaf SL |
528 | same("{3}", |
529 | &[NextArgument(Argument { | |
530 | position: ArgumentIs(3), | |
531 | format: fmtdflt(), | |
532 | })]); | |
1a4d82fc JJ |
533 | } |
534 | #[test] | |
535 | fn format_position_nothing_else() { | |
b039eaaf SL |
536 | same("{3:}", |
537 | &[NextArgument(Argument { | |
538 | position: ArgumentIs(3), | |
539 | format: fmtdflt(), | |
540 | })]); | |
1a4d82fc JJ |
541 | } |
542 | #[test] | |
543 | fn format_type() { | |
b039eaaf SL |
544 | same("{3:a}", |
545 | &[NextArgument(Argument { | |
546 | position: ArgumentIs(3), | |
547 | format: FormatSpec { | |
548 | fill: None, | |
549 | align: AlignUnknown, | |
550 | flags: 0, | |
551 | precision: CountImplied, | |
552 | width: CountImplied, | |
553 | ty: "a", | |
554 | }, | |
555 | })]); | |
1a4d82fc JJ |
556 | } |
557 | #[test] | |
558 | fn format_align_fill() { | |
b039eaaf SL |
559 | same("{3:>}", |
560 | &[NextArgument(Argument { | |
561 | position: ArgumentIs(3), | |
562 | format: FormatSpec { | |
563 | fill: None, | |
564 | align: AlignRight, | |
565 | flags: 0, | |
566 | precision: CountImplied, | |
567 | width: CountImplied, | |
568 | ty: "", | |
569 | }, | |
570 | })]); | |
571 | same("{3:0<}", | |
572 | &[NextArgument(Argument { | |
573 | position: ArgumentIs(3), | |
574 | format: FormatSpec { | |
575 | fill: Some('0'), | |
576 | align: AlignLeft, | |
577 | flags: 0, | |
578 | precision: CountImplied, | |
579 | width: CountImplied, | |
580 | ty: "", | |
581 | }, | |
582 | })]); | |
583 | same("{3:*<abcd}", | |
584 | &[NextArgument(Argument { | |
585 | position: ArgumentIs(3), | |
586 | format: FormatSpec { | |
587 | fill: Some('*'), | |
588 | align: AlignLeft, | |
589 | flags: 0, | |
590 | precision: CountImplied, | |
591 | width: CountImplied, | |
592 | ty: "abcd", | |
593 | }, | |
594 | })]); | |
1a4d82fc JJ |
595 | } |
596 | #[test] | |
597 | fn format_counts() { | |
b039eaaf SL |
598 | same("{:10s}", |
599 | &[NextArgument(Argument { | |
abe05a73 | 600 | position: ArgumentImplicitlyIs(0), |
b039eaaf SL |
601 | format: FormatSpec { |
602 | fill: None, | |
603 | align: AlignUnknown, | |
604 | flags: 0, | |
605 | precision: CountImplied, | |
606 | width: CountIs(10), | |
607 | ty: "s", | |
608 | }, | |
609 | })]); | |
610 | same("{:10$.10s}", | |
611 | &[NextArgument(Argument { | |
abe05a73 | 612 | position: ArgumentImplicitlyIs(0), |
b039eaaf SL |
613 | format: FormatSpec { |
614 | fill: None, | |
615 | align: AlignUnknown, | |
616 | flags: 0, | |
617 | precision: CountIs(10), | |
618 | width: CountIsParam(10), | |
619 | ty: "s", | |
620 | }, | |
621 | })]); | |
622 | same("{:.*s}", | |
623 | &[NextArgument(Argument { | |
abe05a73 | 624 | position: ArgumentImplicitlyIs(1), |
b039eaaf SL |
625 | format: FormatSpec { |
626 | fill: None, | |
627 | align: AlignUnknown, | |
628 | flags: 0, | |
5bcae85e | 629 | precision: CountIsParam(0), |
b039eaaf SL |
630 | width: CountImplied, |
631 | ty: "s", | |
632 | }, | |
633 | })]); | |
634 | same("{:.10$s}", | |
635 | &[NextArgument(Argument { | |
abe05a73 | 636 | position: ArgumentImplicitlyIs(0), |
b039eaaf SL |
637 | format: FormatSpec { |
638 | fill: None, | |
639 | align: AlignUnknown, | |
640 | flags: 0, | |
641 | precision: CountIsParam(10), | |
642 | width: CountImplied, | |
643 | ty: "s", | |
644 | }, | |
645 | })]); | |
646 | same("{:a$.b$s}", | |
647 | &[NextArgument(Argument { | |
abe05a73 | 648 | position: ArgumentImplicitlyIs(0), |
b039eaaf SL |
649 | format: FormatSpec { |
650 | fill: None, | |
651 | align: AlignUnknown, | |
652 | flags: 0, | |
653 | precision: CountIsName("b"), | |
654 | width: CountIsName("a"), | |
655 | ty: "s", | |
656 | }, | |
657 | })]); | |
1a4d82fc JJ |
658 | } |
659 | #[test] | |
660 | fn format_flags() { | |
b039eaaf SL |
661 | same("{:-}", |
662 | &[NextArgument(Argument { | |
abe05a73 | 663 | position: ArgumentImplicitlyIs(0), |
b039eaaf SL |
664 | format: FormatSpec { |
665 | fill: None, | |
666 | align: AlignUnknown, | |
667 | flags: (1 << FlagSignMinus as u32), | |
668 | precision: CountImplied, | |
669 | width: CountImplied, | |
670 | ty: "", | |
671 | }, | |
672 | })]); | |
673 | same("{:+#}", | |
674 | &[NextArgument(Argument { | |
abe05a73 | 675 | position: ArgumentImplicitlyIs(0), |
b039eaaf SL |
676 | format: FormatSpec { |
677 | fill: None, | |
678 | align: AlignUnknown, | |
679 | flags: (1 << FlagSignPlus as u32) | (1 << FlagAlternate as u32), | |
680 | precision: CountImplied, | |
681 | width: CountImplied, | |
682 | ty: "", | |
683 | }, | |
684 | })]); | |
1a4d82fc JJ |
685 | } |
686 | #[test] | |
687 | fn format_mixture() { | |
b039eaaf SL |
688 | same("abcd {3:a} efg", |
689 | &[String("abcd "), | |
690 | NextArgument(Argument { | |
691 | position: ArgumentIs(3), | |
692 | format: FormatSpec { | |
693 | fill: None, | |
694 | align: AlignUnknown, | |
695 | flags: 0, | |
696 | precision: CountImplied, | |
697 | width: CountImplied, | |
698 | ty: "a", | |
699 | }, | |
700 | }), | |
701 | String(" efg")]); | |
1a4d82fc JJ |
702 | } |
703 | } |