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1// Copyright 2012 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//! Parameterized string expansion
12
92a42be0 13use self::Param::*;
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14use self::States::*;
15use self::FormatState::*;
16use self::FormatOp::*;
92a42be0 17
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18use std::iter::repeat;
19
92a42be0 20#[derive(Clone, Copy, PartialEq)]
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21enum States {
22 Nothing,
23 Percent,
24 SetVar,
25 GetVar,
26 PushParam,
27 CharConstant,
28 CharClose,
92a42be0 29 IntConstant(i32),
1a4d82fc 30 FormatPattern(Flags, FormatState),
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31 SeekIfElse(usize),
32 SeekIfElsePercent(usize),
33 SeekIfEnd(usize),
34 SeekIfEndPercent(usize),
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35}
36
92a42be0 37#[derive(Copy, PartialEq, Clone)]
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38enum FormatState {
39 FormatStateFlags,
40 FormatStateWidth,
92a42be0 41 FormatStatePrecision,
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42}
43
44/// Types of parameters a capability can use
45#[allow(missing_docs)]
46#[derive(Clone)]
47pub enum Param {
48 Words(String),
92a42be0 49 Number(i32),
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50}
51
52/// Container for static and dynamic variable arrays
53pub struct Variables {
54 /// Static variables A-Z
55 sta: [Param; 26],
56 /// Dynamic variables a-z
92a42be0 57 dyn: [Param; 26],
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58}
59
60impl Variables {
61 /// Return a new zero-initialized Variables
62 pub fn new() -> Variables {
63 Variables {
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64 sta: [Number(0), Number(0), Number(0), Number(0), Number(0), Number(0), Number(0),
65 Number(0), Number(0), Number(0), Number(0), Number(0), Number(0), Number(0),
66 Number(0), Number(0), Number(0), Number(0), Number(0), Number(0), Number(0),
67 Number(0), Number(0), Number(0), Number(0), Number(0)],
68 dyn: [Number(0), Number(0), Number(0), Number(0), Number(0), Number(0), Number(0),
69 Number(0), Number(0), Number(0), Number(0), Number(0), Number(0), Number(0),
70 Number(0), Number(0), Number(0), Number(0), Number(0), Number(0), Number(0),
71 Number(0), Number(0), Number(0), Number(0), Number(0)],
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72 }
73 }
74}
75
76/// Expand a parameterized capability
77///
78/// # Arguments
79/// * `cap` - string to expand
80/// * `params` - vector of params for %p1 etc
81/// * `vars` - Variables struct for %Pa etc
82///
83/// To be compatible with ncurses, `vars` should be the same between calls to `expand` for
84/// multiple capabilities for the same terminal.
92a42be0 85pub fn expand(cap: &[u8], params: &[Param], vars: &mut Variables) -> Result<Vec<u8>, String> {
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86 let mut state = Nothing;
87
88 // expanded cap will only rarely be larger than the cap itself
89 let mut output = Vec::with_capacity(cap.len());
90
91 let mut stack: Vec<Param> = Vec::new();
92
93 // Copy parameters into a local vector for mutability
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94 let mut mparams = [Number(0), Number(0), Number(0), Number(0), Number(0), Number(0),
95 Number(0), Number(0), Number(0)];
96 for (dst, src) in mparams.iter_mut().zip(params.iter()) {
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97 *dst = (*src).clone();
98 }
99
92a42be0 100 for &c in cap.iter() {
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101 let cur = c as char;
102 let mut old_state = state;
103 match state {
104 Nothing => {
105 if cur == '%' {
106 state = Percent;
107 } else {
108 output.push(c);
109 }
92a42be0 110 }
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111 Percent => {
112 match cur {
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113 '%' => {
114 output.push(c);
115 state = Nothing
116 }
117 'c' => {
118 match stack.pop() {
1a4d82fc 119 // if c is 0, use 0200 (128) for ncurses compatibility
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120 Some(Number(0)) => output.push(128u8),
121 // Don't check bounds. ncurses just casts and truncates.
122 Some(Number(c)) => output.push(c as u8),
123 Some(_) => return Err("a non-char was used with %c".to_string()),
124 None => return Err("stack is empty".to_string()),
1a4d82fc 125 }
92a42be0 126 }
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127 'p' => state = PushParam,
128 'P' => state = SetVar,
129 'g' => state = GetVar,
130 '\'' => state = CharConstant,
131 '{' => state = IntConstant(0),
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132 'l' => {
133 match stack.pop() {
134 Some(Words(s)) => stack.push(Number(s.len() as i32)),
135 Some(_) => return Err("a non-str was used with %l".to_string()),
136 None => return Err("stack is empty".to_string()),
1a4d82fc 137 }
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138 }
139 '+' | '-' | '/' | '*' | '^' | '&' | '|' | 'm' => {
140 match (stack.pop(), stack.pop()) {
141 (Some(Number(y)), Some(Number(x))) => {
142 stack.push(Number(match cur {
143 '+' => x + y,
144 '-' => x - y,
145 '*' => x * y,
146 '/' => x / y,
147 '|' => x | y,
148 '&' => x & y,
149 '^' => x ^ y,
150 'm' => x % y,
151 _ => unreachable!("All cases handled"),
152 }))
153 }
154 (Some(_), Some(_)) => {
155 return Err(format!("non-numbers on stack with {}", cur))
156 }
157 _ => return Err("stack is empty".to_string()),
1a4d82fc 158 }
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159 }
160 '=' | '>' | '<' | 'A' | 'O' => {
161 match (stack.pop(), stack.pop()) {
162 (Some(Number(y)), Some(Number(x))) => {
163 stack.push(Number(if match cur {
164 '=' => x == y,
165 '<' => x < y,
166 '>' => x > y,
167 'A' => x > 0 && y > 0,
168 'O' => x > 0 || y > 0,
169 _ => unreachable!(),
170 } {
171 1
172 } else {
173 0
174 }))
175 }
176 (Some(_), Some(_)) => {
177 return Err(format!("non-numbers on stack with {}", cur))
178 }
179 _ => return Err("stack is empty".to_string()),
1a4d82fc 180 }
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181 }
182 '!' | '~' => {
183 match stack.pop() {
184 Some(Number(x)) => {
185 stack.push(Number(match cur {
186 '!' if x > 0 => 0,
187 '!' => 1,
188 '~' => !x,
189 _ => unreachable!(),
190 }))
191 }
192 Some(_) => return Err(format!("non-numbers on stack with {}", cur)),
193 None => return Err("stack is empty".to_string()),
1a4d82fc 194 }
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195 }
196 'i' => {
197 match (&mparams[0], &mparams[1]) {
198 (&Number(x), &Number(y)) => {
199 mparams[0] = Number(x + 1);
200 mparams[1] = Number(y + 1);
201 }
202 (_, _) => {
203 return Err("first two params not numbers with %i".to_string())
204 }
1a4d82fc 205 }
92a42be0 206 }
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207
208 // printf-style support for %doxXs
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209 'd' | 'o' | 'x' | 'X' | 's' => {
210 if let Some(arg) = stack.pop() {
211 let flags = Flags::new();
54a0048b 212 let res = format(arg, FormatOp::from_char(cur), flags)?;
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213 output.extend(res.iter().map(|x| *x));
214 } else {
215 return Err("stack is empty".to_string());
216 }
217 }
218 ':' | '#' | ' ' | '.' | '0'...'9' => {
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219 let mut flags = Flags::new();
220 let mut fstate = FormatStateFlags;
221 match cur {
222 ':' => (),
223 '#' => flags.alternate = true,
224 ' ' => flags.space = true,
225 '.' => fstate = FormatStatePrecision,
226 '0'...'9' => {
c34b1796 227 flags.width = cur as usize - '0' as usize;
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228 fstate = FormatStateWidth;
229 }
92a42be0 230 _ => unreachable!(),
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231 }
232 state = FormatPattern(flags, fstate);
233 }
234
235 // conditionals
236 '?' => (),
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237 't' => {
238 match stack.pop() {
239 Some(Number(0)) => state = SeekIfElse(0),
240 Some(Number(_)) => (),
241 Some(_) => {
242 return Err("non-number on stack with conditional".to_string())
243 }
244 None => return Err("stack is empty".to_string()),
1a4d82fc 245 }
92a42be0 246 }
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247 'e' => state = SeekIfEnd(0),
248 ';' => (),
92a42be0 249 _ => return Err(format!("unrecognized format option {}", cur)),
1a4d82fc 250 }
92a42be0 251 }
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252 PushParam => {
253 // params are 1-indexed
254 stack.push(mparams[match cur.to_digit(10) {
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255 Some(d) => d as usize - 1,
256 None => return Err("bad param number".to_string()),
257 }]
258 .clone());
259 }
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260 SetVar => {
261 if cur >= 'A' && cur <= 'Z' {
92a42be0 262 if let Some(arg) = stack.pop() {
1a4d82fc 263 let idx = (cur as u8) - b'A';
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264 vars.sta[idx as usize] = arg;
265 } else {
266 return Err("stack is empty".to_string());
267 }
1a4d82fc 268 } else if cur >= 'a' && cur <= 'z' {
92a42be0 269 if let Some(arg) = stack.pop() {
1a4d82fc 270 let idx = (cur as u8) - b'a';
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271 vars.dyn[idx as usize] = arg;
272 } else {
273 return Err("stack is empty".to_string());
274 }
1a4d82fc 275 } else {
92a42be0 276 return Err("bad variable name in %P".to_string());
1a4d82fc 277 }
92a42be0 278 }
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279 GetVar => {
280 if cur >= 'A' && cur <= 'Z' {
281 let idx = (cur as u8) - b'A';
c34b1796 282 stack.push(vars.sta[idx as usize].clone());
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283 } else if cur >= 'a' && cur <= 'z' {
284 let idx = (cur as u8) - b'a';
c34b1796 285 stack.push(vars.dyn[idx as usize].clone());
1a4d82fc 286 } else {
92a42be0 287 return Err("bad variable name in %g".to_string());
1a4d82fc 288 }
92a42be0 289 }
1a4d82fc 290 CharConstant => {
92a42be0 291 stack.push(Number(c as i32));
1a4d82fc 292 state = CharClose;
92a42be0 293 }
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294 CharClose => {
295 if cur != '\'' {
92a42be0 296 return Err("malformed character constant".to_string());
1a4d82fc 297 }
92a42be0 298 }
1a4d82fc 299 IntConstant(i) => {
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300 if cur == '}' {
301 stack.push(Number(i));
302 state = Nothing;
303 } else if let Some(digit) = cur.to_digit(10) {
304 match i.checked_mul(10).and_then(|i_ten| i_ten.checked_add(digit as i32)) {
305 Some(i) => {
306 state = IntConstant(i);
307 old_state = Nothing;
308 }
309 None => return Err("int constant too large".to_string()),
1a4d82fc 310 }
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311 } else {
312 return Err("bad int constant".to_string());
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313 }
314 }
315 FormatPattern(ref mut flags, ref mut fstate) => {
316 old_state = Nothing;
317 match (*fstate, cur) {
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318 (_, 'd') | (_, 'o') | (_, 'x') | (_, 'X') | (_, 's') => {
319 if let Some(arg) = stack.pop() {
54a0048b 320 let res = format(arg, FormatOp::from_char(cur), *flags)?;
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321 output.extend(res.iter().map(|x| *x));
322 // will cause state to go to Nothing
323 old_state = FormatPattern(*flags, *fstate);
324 } else {
325 return Err("stack is empty".to_string());
326 }
327 }
328 (FormatStateFlags, '#') => {
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329 flags.alternate = true;
330 }
92a42be0 331 (FormatStateFlags, '-') => {
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332 flags.left = true;
333 }
92a42be0 334 (FormatStateFlags, '+') => {
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335 flags.sign = true;
336 }
92a42be0 337 (FormatStateFlags, ' ') => {
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338 flags.space = true;
339 }
92a42be0 340 (FormatStateFlags, '0'...'9') => {
c34b1796 341 flags.width = cur as usize - '0' as usize;
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342 *fstate = FormatStateWidth;
343 }
92a42be0 344 (FormatStateFlags, '.') => {
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345 *fstate = FormatStatePrecision;
346 }
92a42be0 347 (FormatStateWidth, '0'...'9') => {
1a4d82fc 348 let old = flags.width;
c34b1796 349 flags.width = flags.width * 10 + (cur as usize - '0' as usize);
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350 if flags.width < old {
351 return Err("format width overflow".to_string());
352 }
1a4d82fc 353 }
92a42be0 354 (FormatStateWidth, '.') => {
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355 *fstate = FormatStatePrecision;
356 }
92a42be0 357 (FormatStatePrecision, '0'...'9') => {
1a4d82fc 358 let old = flags.precision;
c34b1796 359 flags.precision = flags.precision * 10 + (cur as usize - '0' as usize);
1a4d82fc 360 if flags.precision < old {
92a42be0 361 return Err("format precision overflow".to_string());
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362 }
363 }
92a42be0 364 _ => return Err("invalid format specifier".to_string()),
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365 }
366 }
367 SeekIfElse(level) => {
368 if cur == '%' {
369 state = SeekIfElsePercent(level);
370 }
371 old_state = Nothing;
372 }
373 SeekIfElsePercent(level) => {
374 if cur == ';' {
375 if level == 0 {
376 state = Nothing;
377 } else {
92a42be0 378 state = SeekIfElse(level - 1);
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379 }
380 } else if cur == 'e' && level == 0 {
381 state = Nothing;
382 } else if cur == '?' {
92a42be0 383 state = SeekIfElse(level + 1);
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384 } else {
385 state = SeekIfElse(level);
386 }
387 }
388 SeekIfEnd(level) => {
389 if cur == '%' {
390 state = SeekIfEndPercent(level);
391 }
392 old_state = Nothing;
393 }
394 SeekIfEndPercent(level) => {
395 if cur == ';' {
396 if level == 0 {
397 state = Nothing;
398 } else {
92a42be0 399 state = SeekIfEnd(level - 1);
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400 }
401 } else if cur == '?' {
92a42be0 402 state = SeekIfEnd(level + 1);
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403 } else {
404 state = SeekIfEnd(level);
405 }
406 }
407 }
408 if state == old_state {
409 state = Nothing;
410 }
411 }
412 Ok(output)
413}
414
92a42be0 415#[derive(Copy, PartialEq, Clone)]
1a4d82fc 416struct Flags {
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417 width: usize,
418 precision: usize,
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419 alternate: bool,
420 left: bool,
421 sign: bool,
92a42be0 422 space: bool,
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423}
424
425impl Flags {
426 fn new() -> Flags {
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427 Flags {
428 width: 0,
429 precision: 0,
430 alternate: false,
431 left: false,
432 sign: false,
433 space: false,
434 }
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435 }
436}
437
c34b1796 438#[derive(Copy, Clone)]
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439enum FormatOp {
440 FormatDigit,
441 FormatOctal,
442 FormatHex,
443 FormatHEX,
92a42be0 444 FormatString,
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445}
446
447impl FormatOp {
448 fn from_char(c: char) -> FormatOp {
449 match c {
450 'd' => FormatDigit,
451 'o' => FormatOctal,
452 'x' => FormatHex,
453 'X' => FormatHEX,
454 's' => FormatString,
92a42be0 455 _ => panic!("bad FormatOp char"),
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456 }
457 }
458 fn to_char(self) -> char {
459 match self {
460 FormatDigit => 'd',
461 FormatOctal => 'o',
462 FormatHex => 'x',
463 FormatHEX => 'X',
92a42be0 464 FormatString => 's',
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465 }
466 }
467}
468
92a42be0 469fn format(val: Param, op: FormatOp, flags: Flags) -> Result<Vec<u8>, String> {
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470 let mut s = match val {
471 Number(d) => {
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472 match op {
473 FormatDigit => {
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474 if flags.sign {
475 format!("{:+01$}", d, flags.precision)
476 } else if d < 0 {
477 // C doesn't take sign into account in precision calculation.
478 format!("{:01$}", d, flags.precision + 1)
479 } else if flags.space {
480 format!(" {:01$}", d, flags.precision)
481 } else {
482 format!("{:01$}", d, flags.precision)
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483 }
484 }
485 FormatOctal => {
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486 if flags.alternate {
487 // Leading octal zero counts against precision.
488 format!("0{:01$o}", d, flags.precision.saturating_sub(1))
489 } else {
490 format!("{:01$o}", d, flags.precision)
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491 }
492 }
493 FormatHex => {
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494 if flags.alternate && d != 0 {
495 format!("0x{:01$x}", d, flags.precision)
496 } else {
497 format!("{:01$x}", d, flags.precision)
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498 }
499 }
500 FormatHEX => {
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501 if flags.alternate && d != 0 {
502 format!("0X{:01$X}", d, flags.precision)
503 } else {
504 format!("{:01$X}", d, flags.precision)
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505 }
506 }
92a42be0 507 FormatString => return Err("non-number on stack with %s".to_string()),
1a4d82fc 508 }
92a42be0 509 .into_bytes()
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510 }
511 Words(s) => {
512 match op {
513 FormatString => {
92a42be0 514 let mut s = s.into_bytes();
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515 if flags.precision > 0 && flags.precision < s.len() {
516 s.truncate(flags.precision);
517 }
518 s
519 }
92a42be0 520 _ => return Err(format!("non-string on stack with %{}", op.to_char())),
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521 }
522 }
523 };
524 if flags.width > s.len() {
525 let n = flags.width - s.len();
526 if flags.left {
527 s.extend(repeat(b' ').take(n));
528 } else {
529 let mut s_ = Vec::with_capacity(flags.width);
530 s_.extend(repeat(b' ').take(n));
92a42be0 531 s_.extend(s.into_iter());
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532 s = s_;
533 }
534 }
535 Ok(s)
536}
537
538#[cfg(test)]
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539mod test {
540 use super::{expand, Variables};
541 use super::Param::{self, Words, Number};
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542 use std::result::Result::Ok;
543
544 #[test]
545 fn test_basic_setabf() {
546 let s = b"\\E[48;5;%p1%dm";
547 assert_eq!(expand(s, &[Number(1)], &mut Variables::new()).unwrap(),
548 "\\E[48;5;1m".bytes().collect::<Vec<_>>());
549 }
550
551 #[test]
552 fn test_multiple_int_constants() {
553 assert_eq!(expand(b"%{1}%{2}%d%d", &[], &mut Variables::new()).unwrap(),
554 "21".bytes().collect::<Vec<_>>());
555 }
556
557 #[test]
558 fn test_op_i() {
559 let mut vars = Variables::new();
560 assert_eq!(expand(b"%p1%d%p2%d%p3%d%i%p1%d%p2%d%p3%d",
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561 &[Number(1), Number(2), Number(3)],
562 &mut vars),
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563 Ok("123233".bytes().collect::<Vec<_>>()));
564 assert_eq!(expand(b"%p1%d%p2%d%i%p1%d%p2%d", &[], &mut vars),
565 Ok("0011".bytes().collect::<Vec<_>>()));
566 }
567
568 #[test]
569 fn test_param_stack_failure_conditions() {
570 let mut varstruct = Variables::new();
571 let vars = &mut varstruct;
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572 fn get_res(fmt: &str,
573 cap: &str,
574 params: &[Param],
575 vars: &mut Variables)
576 -> Result<Vec<u8>, String> {
1a4d82fc 577 let mut u8v: Vec<_> = fmt.bytes().collect();
92a42be0 578 u8v.extend(cap.as_bytes().iter().map(|&b| b));
85aaf69f 579 expand(&u8v, params, vars)
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580 }
581
582 let caps = ["%d", "%c", "%s", "%Pa", "%l", "%!", "%~"];
92a42be0 583 for &cap in caps.iter() {
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584 let res = get_res("", cap, &[], vars);
585 assert!(res.is_err(),
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586 "Op {} succeeded incorrectly with 0 stack entries",
587 cap);
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588 let p = if cap == "%s" || cap == "%l" {
589 Words("foo".to_string())
590 } else {
591 Number(97)
592 };
593 let res = get_res("%p1", cap, &[p], vars);
594 assert!(res.is_ok(),
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595 "Op {} failed with 1 stack entry: {}",
596 cap,
597 res.err().unwrap());
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598 }
599 let caps = ["%+", "%-", "%*", "%/", "%m", "%&", "%|", "%A", "%O"];
92a42be0 600 for &cap in caps.iter() {
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601 let res = expand(cap.as_bytes(), &[], vars);
602 assert!(res.is_err(),
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603 "Binop {} succeeded incorrectly with 0 stack entries",
604 cap);
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605 let res = get_res("%{1}", cap, &[], vars);
606 assert!(res.is_err(),
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607 "Binop {} succeeded incorrectly with 1 stack entry",
608 cap);
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609 let res = get_res("%{1}%{2}", cap, &[], vars);
610 assert!(res.is_ok(),
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611 "Binop {} failed with 2 stack entries: {}",
612 cap,
613 res.err().unwrap());
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614 }
615 }
616
617 #[test]
618 fn test_push_bad_param() {
619 assert!(expand(b"%pa", &[], &mut Variables::new()).is_err());
620 }
621
622 #[test]
623 fn test_comparison_ops() {
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624 let v = [('<', [1u8, 0u8, 0u8]), ('=', [0u8, 1u8, 0u8]), ('>', [0u8, 0u8, 1u8])];
625 for &(op, bs) in v.iter() {
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626 let s = format!("%{{1}}%{{2}}%{}%d", op);
627 let res = expand(s.as_bytes(), &[], &mut Variables::new());
85aaf69f 628 assert!(res.is_ok(), res.err().unwrap());
92a42be0 629 assert_eq!(res.unwrap(), vec![b'0' + bs[0]]);
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630 let s = format!("%{{1}}%{{1}}%{}%d", op);
631 let res = expand(s.as_bytes(), &[], &mut Variables::new());
85aaf69f 632 assert!(res.is_ok(), res.err().unwrap());
92a42be0 633 assert_eq!(res.unwrap(), vec![b'0' + bs[1]]);
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634 let s = format!("%{{2}}%{{1}}%{}%d", op);
635 let res = expand(s.as_bytes(), &[], &mut Variables::new());
85aaf69f 636 assert!(res.is_ok(), res.err().unwrap());
92a42be0 637 assert_eq!(res.unwrap(), vec![b'0' + bs[2]]);
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638 }
639 }
640
641 #[test]
642 fn test_conditionals() {
643 let mut vars = Variables::new();
644 let s = b"\\E[%?%p1%{8}%<%t3%p1%d%e%p1%{16}%<%t9%p1%{8}%-%d%e38;5;%p1%d%;m";
645 let res = expand(s, &[Number(1)], &mut vars);
85aaf69f 646 assert!(res.is_ok(), res.err().unwrap());
92a42be0 647 assert_eq!(res.unwrap(), "\\E[31m".bytes().collect::<Vec<_>>());
1a4d82fc 648 let res = expand(s, &[Number(8)], &mut vars);
85aaf69f 649 assert!(res.is_ok(), res.err().unwrap());
92a42be0 650 assert_eq!(res.unwrap(), "\\E[90m".bytes().collect::<Vec<_>>());
1a4d82fc 651 let res = expand(s, &[Number(42)], &mut vars);
85aaf69f 652 assert!(res.is_ok(), res.err().unwrap());
92a42be0 653 assert_eq!(res.unwrap(), "\\E[38;5;42m".bytes().collect::<Vec<_>>());
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654 }
655
656 #[test]
657 fn test_format() {
658 let mut varstruct = Variables::new();
659 let vars = &mut varstruct;
660 assert_eq!(expand(b"%p1%s%p2%2s%p3%2s%p4%.2s",
661 &[Words("foo".to_string()),
662 Words("foo".to_string()),
663 Words("f".to_string()),
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664 Words("foo".to_string())],
665 vars),
1a4d82fc 666 Ok("foofoo ffo".bytes().collect::<Vec<_>>()));
92a42be0 667 assert_eq!(expand(b"%p1%:-4.2s", &[Words("foo".to_string())], vars),
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668 Ok("fo ".bytes().collect::<Vec<_>>()));
669
670 assert_eq!(expand(b"%p1%d%p1%.3d%p1%5d%p1%:+d", &[Number(1)], vars),
671 Ok("1001 1+1".bytes().collect::<Vec<_>>()));
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672 assert_eq!(expand(b"%p1%o%p1%#o%p2%6.4x%p2%#6.4X",
673 &[Number(15), Number(27)],
674 vars),
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675 Ok("17017 001b0X001B".bytes().collect::<Vec<_>>()));
676 }
677}