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.
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.
11 //! Parameterized string expansion
13 use std::{char, slice};
14 use std::mem::replace;
26 FormatPattern(Flags, FormatState),
28 SeekIfElsePercent(int),
40 /// Types of parameters a capability can use
48 /// Container for static and dynamic variable arrays
49 pub struct Variables {
50 /// Static variables A-Z
51 priv sta: [Param, ..26],
52 /// Dynamic variables a-z
53 priv dyn: [Param, ..26]
57 /// Return a new zero-initialized Variables
58 pub fn new() -> Variables {
61 Number(0), Number(0), Number(0), Number(0), Number(0),
62 Number(0), Number(0), Number(0), Number(0), Number(0),
63 Number(0), Number(0), Number(0), Number(0), Number(0),
64 Number(0), Number(0), Number(0), Number(0), Number(0),
65 Number(0), Number(0), Number(0), Number(0), Number(0),
69 Number(0), Number(0), Number(0), Number(0), Number(0),
70 Number(0), Number(0), Number(0), Number(0), Number(0),
71 Number(0), Number(0), Number(0), Number(0), Number(0),
72 Number(0), Number(0), Number(0), Number(0), Number(0),
73 Number(0), Number(0), Number(0), Number(0), Number(0),
81 Expand a parameterized capability
84 * `cap` - string to expand
85 * `params` - vector of params for %p1 etc
86 * `vars` - Variables struct for %Pa etc
88 To be compatible with ncurses, `vars` should be the same between calls to `expand` for
89 multiple capabilities for the same terminal.
91 pub fn expand(cap: &[u8], params: &[Param], vars: &mut Variables)
92 -> Result<~[u8], ~str> {
93 let mut state = Nothing;
95 // expanded cap will only rarely be larger than the cap itself
96 let mut output = slice::with_capacity(cap.len());
98 let mut stack: ~[Param] = ~[];
100 // Copy parameters into a local vector for mutability
102 Number(0), Number(0), Number(0), Number(0), Number(0),
103 Number(0), Number(0), Number(0), Number(0),
105 for (dst, src) in mparams.mut_iter().zip(params.iter()) {
106 *dst = (*src).clone();
109 for c in cap.iter().map(|&x| x) {
111 let mut old_state = state;
122 '%' => { output.push(c); state = Nothing },
123 'c' => if stack.len() > 0 {
124 match stack.pop().unwrap() {
125 // if c is 0, use 0200 (128) for ncurses compatibility
126 Number(c) => output.push(if c == 0 { 128 } else { c } as u8),
127 _ => return Err(~"a non-char was used with %c")
129 } else { return Err(~"stack is empty") },
130 'p' => state = PushParam,
131 'P' => state = SetVar,
132 'g' => state = GetVar,
133 '\'' => state = CharConstant,
134 '{' => state = IntConstant(0),
135 'l' => if stack.len() > 0 {
136 match stack.pop().unwrap() {
137 String(s) => stack.push(Number(s.len() as int)),
138 _ => return Err(~"a non-str was used with %l")
140 } else { return Err(~"stack is empty") },
141 '+' => if stack.len() > 1 {
142 match (stack.pop().unwrap(), stack.pop().unwrap()) {
143 (Number(y), Number(x)) => stack.push(Number(x + y)),
144 _ => return Err(~"non-numbers on stack with +")
146 } else { return Err(~"stack is empty") },
147 '-' => if stack.len() > 1 {
148 match (stack.pop().unwrap(), stack.pop().unwrap()) {
149 (Number(y), Number(x)) => stack.push(Number(x - y)),
150 _ => return Err(~"non-numbers on stack with -")
152 } else { return Err(~"stack is empty") },
153 '*' => if stack.len() > 1 {
154 match (stack.pop().unwrap(), stack.pop().unwrap()) {
155 (Number(y), Number(x)) => stack.push(Number(x * y)),
156 _ => return Err(~"non-numbers on stack with *")
158 } else { return Err(~"stack is empty") },
159 '/' => if stack.len() > 1 {
160 match (stack.pop().unwrap(), stack.pop().unwrap()) {
161 (Number(y), Number(x)) => stack.push(Number(x / y)),
162 _ => return Err(~"non-numbers on stack with /")
164 } else { return Err(~"stack is empty") },
165 'm' => if stack.len() > 1 {
166 match (stack.pop().unwrap(), stack.pop().unwrap()) {
167 (Number(y), Number(x)) => stack.push(Number(x % y)),
168 _ => return Err(~"non-numbers on stack with %")
170 } else { return Err(~"stack is empty") },
171 '&' => if stack.len() > 1 {
172 match (stack.pop().unwrap(), stack.pop().unwrap()) {
173 (Number(y), Number(x)) => stack.push(Number(x & y)),
174 _ => return Err(~"non-numbers on stack with &")
176 } else { return Err(~"stack is empty") },
177 '|' => if stack.len() > 1 {
178 match (stack.pop().unwrap(), stack.pop().unwrap()) {
179 (Number(y), Number(x)) => stack.push(Number(x | y)),
180 _ => return Err(~"non-numbers on stack with |")
182 } else { return Err(~"stack is empty") },
183 '^' => if stack.len() > 1 {
184 match (stack.pop().unwrap(), stack.pop().unwrap()) {
185 (Number(y), Number(x)) => stack.push(Number(x ^ y)),
186 _ => return Err(~"non-numbers on stack with ^")
188 } else { return Err(~"stack is empty") },
189 '=' => if stack.len() > 1 {
190 match (stack.pop().unwrap(), stack.pop().unwrap()) {
191 (Number(y), Number(x)) => stack.push(Number(if x == y { 1 }
193 _ => return Err(~"non-numbers on stack with =")
195 } else { return Err(~"stack is empty") },
196 '>' => if stack.len() > 1 {
197 match (stack.pop().unwrap(), stack.pop().unwrap()) {
198 (Number(y), Number(x)) => stack.push(Number(if x > y { 1 }
200 _ => return Err(~"non-numbers on stack with >")
202 } else { return Err(~"stack is empty") },
203 '<' => if stack.len() > 1 {
204 match (stack.pop().unwrap(), stack.pop().unwrap()) {
205 (Number(y), Number(x)) => stack.push(Number(if x < y { 1 }
207 _ => return Err(~"non-numbers on stack with <")
209 } else { return Err(~"stack is empty") },
210 'A' => if stack.len() > 1 {
211 match (stack.pop().unwrap(), stack.pop().unwrap()) {
212 (Number(0), Number(_)) => stack.push(Number(0)),
213 (Number(_), Number(0)) => stack.push(Number(0)),
214 (Number(_), Number(_)) => stack.push(Number(1)),
215 _ => return Err(~"non-numbers on stack with logical and")
217 } else { return Err(~"stack is empty") },
218 'O' => if stack.len() > 1 {
219 match (stack.pop().unwrap(), stack.pop().unwrap()) {
220 (Number(0), Number(0)) => stack.push(Number(0)),
221 (Number(_), Number(_)) => stack.push(Number(1)),
222 _ => return Err(~"non-numbers on stack with logical or")
224 } else { return Err(~"stack is empty") },
225 '!' => if stack.len() > 0 {
226 match stack.pop().unwrap() {
227 Number(0) => stack.push(Number(1)),
228 Number(_) => stack.push(Number(0)),
229 _ => return Err(~"non-number on stack with logical not")
231 } else { return Err(~"stack is empty") },
232 '~' => if stack.len() > 0 {
233 match stack.pop().unwrap() {
234 Number(x) => stack.push(Number(!x)),
235 _ => return Err(~"non-number on stack with %~")
237 } else { return Err(~"stack is empty") },
238 'i' => match (mparams[0].clone(), mparams[1].clone()) {
239 (Number(x), Number(y)) => {
240 mparams[0] = Number(x+1);
241 mparams[1] = Number(y+1);
243 (_, _) => return Err(~"first two params not numbers with %i")
246 // printf-style support for %doxXs
247 'd'|'o'|'x'|'X'|'s' => if stack.len() > 0 {
248 let flags = Flags::new();
249 let res = format(stack.pop().unwrap(), FormatOp::from_char(cur), flags);
250 if res.is_err() { return res }
251 output.push_all(res.unwrap())
252 } else { return Err(~"stack is empty") },
253 ':'|'#'|' '|'.'|'0'..'9' => {
254 let mut flags = Flags::new();
255 let mut fstate = FormatStateFlags;
258 '#' => flags.alternate = true,
259 ' ' => flags.space = true,
260 '.' => fstate = FormatStatePrecision,
262 flags.width = cur as uint - '0' as uint;
263 fstate = FormatStateWidth;
267 state = FormatPattern(flags, fstate);
272 't' => if stack.len() > 0 {
273 match stack.pop().unwrap() {
274 Number(0) => state = SeekIfElse(0),
276 _ => return Err(~"non-number on stack with conditional")
278 } else { return Err(~"stack is empty") },
279 'e' => state = SeekIfEnd(0),
282 _ => return Err(format!("unrecognized format option {}", cur))
286 // params are 1-indexed
287 stack.push(mparams[match char::to_digit(cur, 10) {
289 None => return Err(~"bad param number")
293 if cur >= 'A' && cur <= 'Z' {
295 let idx = (cur as u8) - ('A' as u8);
296 vars.sta[idx] = stack.pop().unwrap();
297 } else { return Err(~"stack is empty") }
298 } else if cur >= 'a' && cur <= 'z' {
300 let idx = (cur as u8) - ('a' as u8);
301 vars.dyn[idx] = stack.pop().unwrap();
302 } else { return Err(~"stack is empty") }
304 return Err(~"bad variable name in %P");
308 if cur >= 'A' && cur <= 'Z' {
309 let idx = (cur as u8) - ('A' as u8);
310 stack.push(vars.sta[idx].clone());
311 } else if cur >= 'a' && cur <= 'z' {
312 let idx = (cur as u8) - ('a' as u8);
313 stack.push(vars.dyn[idx].clone());
315 return Err(~"bad variable name in %g");
319 stack.push(Number(c as int));
324 return Err(~"malformed character constant");
330 stack.push(Number(i));
334 state = IntConstant(i*10 + (cur as int - '0' as int));
337 _ => return Err(~"bad int constant")
340 FormatPattern(ref mut flags, ref mut fstate) => {
342 match (*fstate, cur) {
343 (_,'d')|(_,'o')|(_,'x')|(_,'X')|(_,'s') => if stack.len() > 0 {
344 let res = format(stack.pop().unwrap(), FormatOp::from_char(cur), *flags);
345 if res.is_err() { return res }
346 output.push_all(res.unwrap());
347 old_state = state; // will cause state to go to Nothing
348 } else { return Err(~"stack is empty") },
349 (FormatStateFlags,'#') => {
350 flags.alternate = true;
352 (FormatStateFlags,'-') => {
355 (FormatStateFlags,'+') => {
358 (FormatStateFlags,' ') => {
361 (FormatStateFlags,'0'..'9') => {
362 flags.width = cur as uint - '0' as uint;
363 *fstate = FormatStateWidth;
365 (FormatStateFlags,'.') => {
366 *fstate = FormatStatePrecision;
368 (FormatStateWidth,'0'..'9') => {
369 let old = flags.width;
370 flags.width = flags.width * 10 + (cur as uint - '0' as uint);
371 if flags.width < old { return Err(~"format width overflow") }
373 (FormatStateWidth,'.') => {
374 *fstate = FormatStatePrecision;
376 (FormatStatePrecision,'0'..'9') => {
377 let old = flags.precision;
378 flags.precision = flags.precision * 10 + (cur as uint - '0' as uint);
379 if flags.precision < old { return Err(~"format precision overflow") }
381 _ => return Err(~"invalid format specifier")
384 SeekIfElse(level) => {
386 state = SeekIfElsePercent(level);
390 SeekIfElsePercent(level) => {
395 state = SeekIfElse(level-1);
397 } else if cur == 'e' && level == 0 {
399 } else if cur == '?' {
400 state = SeekIfElse(level+1);
402 state = SeekIfElse(level);
405 SeekIfEnd(level) => {
407 state = SeekIfEndPercent(level);
411 SeekIfEndPercent(level) => {
416 state = SeekIfEnd(level-1);
418 } else if cur == '?' {
419 state = SeekIfEnd(level+1);
421 state = SeekIfEnd(level);
425 if state == old_state {
444 Flags{ width: 0, precision: 0, alternate: false,
445 left: false, sign: false, space: false }
458 fn from_char(c: char) -> FormatOp {
465 _ => fail!("bad FormatOp char")
468 fn to_char(self) -> char {
479 fn format(val: Param, op: FormatOp, flags: Flags) -> Result<~[u8],~str> {
480 let mut s = match val {
482 let mut s = match (op, flags.sign) {
483 (FormatDigit, true) => format!("{:+d}", d).into_bytes(),
484 (FormatDigit, false) => format!("{:d}", d).into_bytes(),
485 (FormatOctal, _) => format!("{:o}", d).into_bytes(),
486 (FormatHex, _) => format!("{:x}", d).into_bytes(),
487 (FormatHEX, _) => format!("{:X}", d).into_bytes(),
488 (FormatString, _) => return Err(~"non-number on stack with %s"),
490 if flags.precision > s.len() {
491 let mut s_ = slice::with_capacity(flags.precision);
492 let n = flags.precision - s.len();
493 s_.grow(n, &('0' as u8));
497 assert!(!s.is_empty(), "string conversion produced empty result");
500 if flags.space && !(s[0] == '-' as u8 || s[0] == '+' as u8) {
501 s.unshift(' ' as u8);
505 if flags.alternate && s[0] != '0' as u8 {
506 s.unshift('0' as u8);
511 let s_ = replace(&mut s, ~['0' as u8, 'x' as u8]);
516 s = s.into_ascii().to_upper().into_bytes();
518 let s_ = replace(&mut s, ~['0' as u8, 'X' as u8]);
522 FormatString => unreachable!()
529 let mut s = s.as_bytes().to_owned();
530 if flags.precision > 0 && flags.precision < s.len() {
531 s.truncate(flags.precision);
536 return Err(format!("non-string on stack with %{}", op.to_char()))
541 if flags.width > s.len() {
542 let n = flags.width - s.len();
544 s.grow(n, &(' ' as u8));
546 let mut s_ = slice::with_capacity(flags.width);
547 s_.grow(n, &(' ' as u8));
557 use super::{expand,String,Variables,Number};
561 fn test_basic_setabf() {
562 let s = bytes!("\\E[48;5;%p1%dm");
563 assert_eq!(expand(s, [Number(1)], &mut Variables::new()).unwrap(),
564 bytes!("\\E[48;5;1m").to_owned());
568 fn test_multiple_int_constants() {
569 assert_eq!(expand(bytes!("%{1}%{2}%d%d"), [], &mut Variables::new()).unwrap(),
570 bytes!("21").to_owned());
575 let mut vars = Variables::new();
576 assert_eq!(expand(bytes!("%p1%d%p2%d%p3%d%i%p1%d%p2%d%p3%d"),
577 [Number(1),Number(2),Number(3)], &mut vars),
578 Ok(bytes!("123233").to_owned()));
579 assert_eq!(expand(bytes!("%p1%d%p2%d%i%p1%d%p2%d"), [], &mut vars),
580 Ok(bytes!("0011").to_owned()));
584 fn test_param_stack_failure_conditions() {
585 let mut varstruct = Variables::new();
586 let vars = &mut varstruct;
587 let caps = ["%d", "%c", "%s", "%Pa", "%l", "%!", "%~"];
588 for cap in caps.iter() {
589 let res = expand(cap.as_bytes(), [], vars);
590 assert!(res.is_err(),
591 "Op {} succeeded incorrectly with 0 stack entries", *cap);
592 let p = if *cap == "%s" || *cap == "%l" { String(~"foo") } else { Number(97) };
593 let res = expand((bytes!("%p1")).to_owned() + cap.as_bytes(), [p], vars);
595 "Op {} failed with 1 stack entry: {}", *cap, res.unwrap_err());
597 let caps = ["%+", "%-", "%*", "%/", "%m", "%&", "%|", "%A", "%O"];
598 for cap in caps.iter() {
599 let res = expand(cap.as_bytes(), [], vars);
600 assert!(res.is_err(),
601 "Binop {} succeeded incorrectly with 0 stack entries", *cap);
602 let res = expand((bytes!("%{1}")).to_owned() + cap.as_bytes(), [], vars);
603 assert!(res.is_err(),
604 "Binop {} succeeded incorrectly with 1 stack entry", *cap);
605 let res = expand((bytes!("%{1}%{2}")).to_owned() + cap.as_bytes(), [], vars);
607 "Binop {} failed with 2 stack entries: {}", *cap, res.unwrap_err());
612 fn test_push_bad_param() {
613 assert!(expand(bytes!("%pa"), [], &mut Variables::new()).is_err());
617 fn test_comparison_ops() {
618 let v = [('<', [1u8, 0u8, 0u8]), ('=', [0u8, 1u8, 0u8]), ('>', [0u8, 0u8, 1u8])];
619 for &(op, bs) in v.iter() {
620 let s = format!("%\\{1\\}%\\{2\\}%{}%d", op);
621 let res = expand(s.as_bytes(), [], &mut Variables::new());
622 assert!(res.is_ok(), res.unwrap_err());
623 assert_eq!(res.unwrap(), ~['0' as u8 + bs[0]]);
624 let s = format!("%\\{1\\}%\\{1\\}%{}%d", op);
625 let res = expand(s.as_bytes(), [], &mut Variables::new());
626 assert!(res.is_ok(), res.unwrap_err());
627 assert_eq!(res.unwrap(), ~['0' as u8 + bs[1]]);
628 let s = format!("%\\{2\\}%\\{1\\}%{}%d", op);
629 let res = expand(s.as_bytes(), [], &mut Variables::new());
630 assert!(res.is_ok(), res.unwrap_err());
631 assert_eq!(res.unwrap(), ~['0' as u8 + bs[2]]);
636 fn test_conditionals() {
637 let mut vars = Variables::new();
638 let s = bytes!("\\E[%?%p1%{8}%<%t3%p1%d%e%p1%{16}%<%t9%p1%{8}%-%d%e38;5;%p1%d%;m");
639 let res = expand(s, [Number(1)], &mut vars);
640 assert!(res.is_ok(), res.unwrap_err());
641 assert_eq!(res.unwrap(), bytes!("\\E[31m").to_owned());
642 let res = expand(s, [Number(8)], &mut vars);
643 assert!(res.is_ok(), res.unwrap_err());
644 assert_eq!(res.unwrap(), bytes!("\\E[90m").to_owned());
645 let res = expand(s, [Number(42)], &mut vars);
646 assert!(res.is_ok(), res.unwrap_err());
647 assert_eq!(res.unwrap(), bytes!("\\E[38;5;42m").to_owned());
652 let mut varstruct = Variables::new();
653 let vars = &mut varstruct;
654 assert_eq!(expand(bytes!("%p1%s%p2%2s%p3%2s%p4%.2s"),
655 [String(~"foo"), String(~"foo"), String(~"f"), String(~"foo")], vars),
656 Ok(bytes!("foofoo ffo").to_owned()));
657 assert_eq!(expand(bytes!("%p1%:-4.2s"), [String(~"foo")], vars),
658 Ok(bytes!("fo ").to_owned()));
660 assert_eq!(expand(bytes!("%p1%d%p1%.3d%p1%5d%p1%:+d"), [Number(1)], vars),
661 Ok(bytes!("1001 1+1").to_owned()));
662 assert_eq!(expand(bytes!("%p1%o%p1%#o%p2%6.4x%p2%#6.4X"), [Number(15), Number(27)], vars),
663 Ok(bytes!("17017 001b0X001B").to_owned()));