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7da43e41 | 1 | ;;;; "format.scm" Common LISP text output formatter for SLIB |
6dce942c | 2 | ;;; Copyright (C) 2010, 2011, 2012, 2013 Free Software Foundation, Inc. |
e3e33943 AW |
3 | ;;; |
4 | ;;; This library is free software; you can redistribute it and/or | |
5 | ;;; modify it under the terms of the GNU Lesser General Public | |
6 | ;;; License as published by the Free Software Foundation; either | |
7 | ;;; version 3 of the License, or (at your option) any later version. | |
8 | ;;; | |
9 | ;;; This library is distributed in the hope that it will be useful, | |
10 | ;;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | ;;; Lesser General Public License for more details. | |
13 | ;;; | |
14 | ;;; You should have received a copy of the GNU Lesser General Public | |
15 | ;;; License along with this library; if not, write to the Free Software | |
16 | ;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
17 | ;;; | |
18 | ||
19 | ;;; This code was orignally in the public domain. | |
20 | ;;; | |
21 | ;;; Written 1992-1994 by Dirk Lutzebaeck (lutzeb@cs.tu-berlin.de). | |
22 | ;;; | |
23 | ;;; Authors of the version from SLIB (< 1.4) were Ken Dickey and Aubrey | |
24 | ;;; Jaffer. | |
25 | ;;; | |
26 | ;;; Assimilated into Guile May 1999. | |
27 | ;;; | |
28 | ;;; Please don't bother the original authors with bug reports, though; | |
29 | ;;; send them to bug-guile@gnu.org. | |
30 | ;;; | |
7da43e41 | 31 | |
b337528f | 32 | (define-module (ice-9 format) |
e3e33943 | 33 | #:autoload (ice-9 pretty-print) (pretty-print truncated-print) |
afd08fdf | 34 | #:autoload (ice-9 i18n) (%global-locale number->locale-string) |
9ebf1af3 | 35 | #:replace (format)) |
7da43e41 | 36 | |
b90b4b2b | 37 | (define format:version "3.0") |
7da43e41 | 38 | |
098e6fc6 | 39 | (define (format destination format-string . format-args) |
8390dac0 AW |
40 | (if (not (string? format-string)) |
41 | (error "format: expected a string for format string" format-string)) | |
42 | ||
79f124ac | 43 | (let* ((port |
8390dac0 | 44 | (cond |
6dce942c | 45 | ((not destination) (open-output-string)) |
8390dac0 AW |
46 | ((boolean? destination) (current-output-port)) ; boolean but not false |
47 | ((output-port? destination) destination) | |
48 | ((number? destination) | |
49 | (issue-deprecation-warning | |
50 | "Passing a number to format as the port is deprecated." | |
51 | "Pass (current-error-port) instead.") | |
52 | (current-error-port)) | |
53 | (else | |
54 | (error "format: bad destination `~a'" destination)))) | |
8390dac0 | 55 | |
b90b4b2b AW |
56 | (output-col (or (port-column port) 0)) |
57 | ||
58 | (flush-output? #f)) | |
59 | ||
8390dac0 AW |
60 | (define format:case-conversion #f) |
61 | (define format:pos 0) ; curr. format string parsing position | |
62 | (define format:arg-pos 0) ; curr. format argument position | |
7da43e41 | 63 | ; this is global for error presentation |
093d2ca9 | 64 | |
79f124ac | 65 | ;; format string and char output routines on port |
8390dac0 AW |
66 | |
67 | (define (format:out-str str) | |
68 | (if format:case-conversion | |
79f124ac AW |
69 | (display (format:case-conversion str) port) |
70 | (display str port)) | |
71 | (set! output-col | |
72 | (+ output-col (string-length str)))) | |
8390dac0 AW |
73 | |
74 | (define (format:out-char ch) | |
75 | (if format:case-conversion | |
76 | (display (format:case-conversion (string ch)) | |
79f124ac AW |
77 | port) |
78 | (write-char ch port)) | |
79 | (set! output-col | |
8390dac0 AW |
80 | (if (char=? ch #\newline) |
81 | 0 | |
79f124ac | 82 | (+ output-col 1)))) |
093d2ca9 | 83 | |
8390dac0 | 84 | ;;(define (format:out-substr str i n) ; this allocates a new string |
79f124ac AW |
85 | ;; (display (substring str i n) port) |
86 | ;; (set! output-col (+ output-col n))) | |
8390dac0 AW |
87 | |
88 | (define (format:out-substr str i n) | |
89 | (do ((k i (+ k 1))) | |
90 | ((= k n)) | |
79f124ac AW |
91 | (write-char (string-ref str k) port)) |
92 | (set! output-col (+ output-col (- n i)))) | |
8390dac0 AW |
93 | |
94 | ;;(define (format:out-fill n ch) ; this allocates a new string | |
95 | ;; (format:out-str (make-string n ch))) | |
96 | ||
97 | (define (format:out-fill n ch) | |
98 | (do ((i 0 (+ i 1))) | |
99 | ((= i n)) | |
79f124ac AW |
100 | (write-char ch port)) |
101 | (set! output-col (+ output-col n))) | |
8390dac0 AW |
102 | |
103 | ;; format's user error handler | |
104 | ||
105 | (define (format:error . args) ; never returns! | |
106 | (let ((port (current-error-port))) | |
107 | (set! format:error format:intern-error) | |
108 | (if (not (zero? format:arg-pos)) | |
109 | (set! format:arg-pos (- format:arg-pos 1))) | |
110 | (format port | |
111 | "~%FORMAT: error with call: (format ~a \"~a<===~a\" ~ | |
7da43e41 | 112 | ~{~a ~}===>~{~a ~})~% " |
8390dac0 AW |
113 | destination |
114 | (substring format-string 0 format:pos) | |
115 | (substring format-string format:pos | |
116 | (string-length format-string)) | |
117 | (list-head format-args format:arg-pos) | |
118 | (list-tail format-args format:arg-pos)) | |
119 | (apply format port args) | |
120 | (newline port) | |
121 | (set! format:error format:error-save) | |
122 | (format:abort))) | |
123 | ||
124 | (define (format:intern-error . args) | |
125 | ;;if something goes wrong in format:error | |
126 | (display "FORMAT: INTERNAL ERROR IN FORMAT:ERROR!") (newline) | |
127 | (display " destination: ") (write destination) (newline) | |
128 | (display " format string: ") (write format-string) (newline) | |
129 | (display " format args: ") (write format-args) (newline) | |
130 | (display " error args: ") (write args) (newline) | |
29d096c8 | 131 | (set! format:error format:error-save) |
8390dac0 | 132 | (format:abort)) |
093d2ca9 | 133 | |
8390dac0 | 134 | (define format:error-save format:error) |
0e930680 | 135 | |
8390dac0 AW |
136 | (define format:parameter-characters |
137 | '(#\0 #\1 #\2 #\3 #\4 #\5 #\6 #\7 #\8 #\9 #\- #\+ #\v #\# #\')) | |
138 | ||
139 | (define (format:format-work format-string arglist) ; does the formatting work | |
140 | (letrec | |
141 | ((format-string-len (string-length format-string)) | |
142 | (arg-pos 0) ; argument position in arglist | |
143 | (arg-len (length arglist)) ; number of arguments | |
144 | (modifier #f) ; 'colon | 'at | 'colon-at | #f | |
145 | (params '()) ; directive parameter list | |
146 | (param-value-found #f) ; a directive | |
093d2ca9 MV |
147 | ; parameter value |
148 | ; found | |
8390dac0 AW |
149 | (conditional-nest 0) ; conditional nesting level |
150 | (clause-pos 0) ; last cond. clause | |
093d2ca9 | 151 | ; beginning char pos |
8390dac0 | 152 | (clause-default #f) ; conditional default |
093d2ca9 | 153 | ; clause string |
8390dac0 | 154 | (clauses '()) ; conditional clause |
093d2ca9 | 155 | ; string list |
8390dac0 | 156 | (conditional-type #f) ; reflects the |
093d2ca9 | 157 | ; contional modifiers |
8390dac0 AW |
158 | (conditional-arg #f) ; argument to apply the conditional |
159 | (iteration-nest 0) ; iteration nesting level | |
160 | (iteration-pos 0) ; iteration string | |
093d2ca9 | 161 | ; beginning char pos |
8390dac0 | 162 | (iteration-type #f) ; reflects the |
093d2ca9 | 163 | ; iteration modifiers |
8390dac0 | 164 | (max-iterations #f) ; maximum number of |
093d2ca9 | 165 | ; iterations |
8390dac0 | 166 | (recursive-pos-save format:pos) |
093d2ca9 | 167 | |
8390dac0 | 168 | (next-char ; gets the next char |
093d2ca9 | 169 | ; from format-string |
8390dac0 AW |
170 | (lambda () |
171 | (let ((ch (peek-next-char))) | |
172 | (set! format:pos (+ 1 format:pos)) | |
173 | ch))) | |
093d2ca9 | 174 | |
8390dac0 AW |
175 | (peek-next-char |
176 | (lambda () | |
177 | (if (>= format:pos format-string-len) | |
178 | (format:error "illegal format string") | |
179 | (string-ref format-string format:pos)))) | |
093d2ca9 | 180 | |
8390dac0 AW |
181 | (one-positive-integer? |
182 | (lambda (params) | |
183 | (cond | |
184 | ((null? params) #f) | |
185 | ((and (integer? (car params)) | |
186 | (>= (car params) 0) | |
187 | (= (length params) 1)) #t) | |
188 | (else | |
189 | (format:error | |
190 | "one positive integer parameter expected"))))) | |
093d2ca9 | 191 | |
8390dac0 AW |
192 | (next-arg |
193 | (lambda () | |
194 | (if (>= arg-pos arg-len) | |
195 | (begin | |
196 | (set! format:arg-pos (+ arg-len 1)) | |
197 | (format:error "missing argument(s)"))) | |
198 | (add-arg-pos 1) | |
199 | (list-ref arglist (- arg-pos 1)))) | |
093d2ca9 | 200 | |
8390dac0 AW |
201 | (prev-arg |
202 | (lambda () | |
203 | (add-arg-pos -1) | |
204 | (if (negative? arg-pos) | |
205 | (format:error "missing backward argument(s)")) | |
206 | (list-ref arglist arg-pos))) | |
093d2ca9 | 207 | |
8390dac0 AW |
208 | (rest-args |
209 | (lambda () | |
210 | (let loop ((l arglist) (k arg-pos)) ; list-tail definition | |
211 | (if (= k 0) l (loop (cdr l) (- k 1)))))) | |
093d2ca9 | 212 | |
8390dac0 AW |
213 | (add-arg-pos |
214 | (lambda (n) | |
215 | (set! arg-pos (+ n arg-pos)) | |
216 | (set! format:arg-pos arg-pos))) | |
093d2ca9 | 217 | |
8390dac0 AW |
218 | (anychar-dispatch ; dispatches the format-string |
219 | (lambda () | |
220 | (if (>= format:pos format-string-len) | |
221 | arg-pos ; used for ~? continuance | |
222 | (let ((char (next-char))) | |
223 | (cond | |
224 | ((char=? char #\~) | |
225 | (set! modifier #f) | |
226 | (set! params '()) | |
227 | (set! param-value-found #f) | |
228 | (tilde-dispatch)) | |
229 | (else | |
230 | (if (and (zero? conditional-nest) | |
231 | (zero? iteration-nest)) | |
232 | (format:out-char char)) | |
233 | (anychar-dispatch))))))) | |
093d2ca9 | 234 | |
8390dac0 AW |
235 | (tilde-dispatch |
236 | (lambda () | |
237 | (cond | |
238 | ((>= format:pos format-string-len) | |
239 | (format:out-str "~") ; tilde at end of | |
093d2ca9 MV |
240 | ; string is just |
241 | ; output | |
8390dac0 | 242 | arg-pos) ; used for ~? |
093d2ca9 | 243 | ; continuance |
8390dac0 AW |
244 | ((and (or (zero? conditional-nest) |
245 | (memv (peek-next-char) ; find conditional | |
093d2ca9 | 246 | ; directives |
8390dac0 AW |
247 | (append '(#\[ #\] #\; #\: #\@ #\^) |
248 | format:parameter-characters))) | |
249 | (or (zero? iteration-nest) | |
250 | (memv (peek-next-char) ; find iteration | |
093d2ca9 | 251 | ; directives |
8390dac0 AW |
252 | (append '(#\{ #\} #\: #\@ #\^) |
253 | format:parameter-characters)))) | |
254 | (case (char-upcase (next-char)) | |
093d2ca9 | 255 | |
8390dac0 | 256 | ;; format directives |
093d2ca9 | 257 | |
8390dac0 AW |
258 | ((#\A) ; Any -- for humans |
259 | (set! format:read-proof | |
260 | (memq modifier '(colon colon-at))) | |
261 | (format:out-obj-padded (memq modifier '(at colon-at)) | |
262 | (next-arg) #f params) | |
263 | (anychar-dispatch)) | |
264 | ((#\S) ; Slashified -- for parsers | |
265 | (set! format:read-proof | |
266 | (memq modifier '(colon colon-at))) | |
267 | (format:out-obj-padded (memq modifier '(at colon-at)) | |
268 | (next-arg) #t params) | |
269 | (anychar-dispatch)) | |
270 | ((#\D) ; Decimal | |
271 | (format:out-num-padded modifier (next-arg) params 10) | |
272 | (anychar-dispatch)) | |
afd08fdf LC |
273 | ((#\H) ; Localized number |
274 | (let* ((num (next-arg)) | |
275 | (locale (case modifier | |
276 | ((colon) (next-arg)) | |
277 | (else %global-locale))) | |
278 | (argc (length params)) | |
279 | (width (format:par params argc 0 #f "width")) | |
280 | (decimals (format:par params argc 1 #t "decimals")) | |
281 | (padchar (integer->char | |
282 | (format:par params argc 2 format:space-ch | |
283 | "padchar"))) | |
284 | (str (number->locale-string num decimals | |
285 | locale))) | |
286 | (format:out-str (if (and width | |
287 | (< (string-length str) width)) | |
288 | (string-pad str width padchar) | |
289 | str))) | |
290 | (anychar-dispatch)) | |
8390dac0 AW |
291 | ((#\X) ; Hexadecimal |
292 | (format:out-num-padded modifier (next-arg) params 16) | |
293 | (anychar-dispatch)) | |
294 | ((#\O) ; Octal | |
295 | (format:out-num-padded modifier (next-arg) params 8) | |
296 | (anychar-dispatch)) | |
297 | ((#\B) ; Binary | |
298 | (format:out-num-padded modifier (next-arg) params 2) | |
299 | (anychar-dispatch)) | |
300 | ((#\R) | |
301 | (if (null? params) | |
302 | (format:out-obj-padded ; Roman, cardinal, | |
093d2ca9 | 303 | ; ordinal numerals |
8390dac0 AW |
304 | #f |
305 | ((case modifier | |
306 | ((at) format:num->roman) | |
307 | ((colon-at) format:num->old-roman) | |
308 | ((colon) format:num->ordinal) | |
309 | (else format:num->cardinal)) | |
310 | (next-arg)) | |
311 | #f params) | |
312 | (format:out-num-padded ; any Radix | |
313 | modifier (next-arg) (cdr params) (car params))) | |
314 | (anychar-dispatch)) | |
315 | ((#\F) ; Fixed-format floating-point | |
316 | (format:out-fixed modifier (next-arg) params) | |
317 | (anychar-dispatch)) | |
318 | ((#\E) ; Exponential floating-point | |
319 | (format:out-expon modifier (next-arg) params) | |
320 | (anychar-dispatch)) | |
321 | ((#\G) ; General floating-point | |
322 | (format:out-general modifier (next-arg) params) | |
323 | (anychar-dispatch)) | |
324 | ((#\$) ; Dollars floating-point | |
325 | (format:out-dollar modifier (next-arg) params) | |
326 | (anychar-dispatch)) | |
327 | ((#\I) ; Complex numbers | |
328 | (let ((z (next-arg))) | |
329 | (if (not (complex? z)) | |
330 | (format:error "argument not a complex number")) | |
331 | (format:out-fixed modifier (real-part z) params) | |
332 | (format:out-fixed 'at (imag-part z) params) | |
333 | (format:out-char #\i)) | |
334 | (anychar-dispatch)) | |
335 | ((#\C) ; Character | |
336 | (let ((ch (if (one-positive-integer? params) | |
337 | (integer->char (car params)) | |
338 | (next-arg)))) | |
339 | (if (not (char? ch)) | |
340 | (format:error "~~c expects a character")) | |
341 | (case modifier | |
342 | ((at) | |
b90b4b2b | 343 | (format:out-str (object->string ch))) |
8390dac0 AW |
344 | ((colon) |
345 | (let ((c (char->integer ch))) | |
346 | (if (< c 0) | |
347 | (set! c (+ c 256))) ; compensate | |
093d2ca9 MV |
348 | ; complement |
349 | ; impl. | |
8390dac0 AW |
350 | (cond |
351 | ((< c #x20) ; assumes that control | |
093d2ca9 | 352 | ; chars are < #x20 |
8390dac0 AW |
353 | (format:out-char #\^) |
354 | (format:out-char | |
355 | (integer->char (+ c #x40)))) | |
356 | ((>= c #x7f) | |
357 | (format:out-str "#\\") | |
358 | (format:out-str | |
359 | (number->string c 8))) | |
360 | (else | |
361 | (format:out-char ch))))) | |
362 | (else (format:out-char ch)))) | |
363 | (anychar-dispatch)) | |
364 | ((#\P) ; Plural | |
365 | (if (memq modifier '(colon colon-at)) | |
366 | (prev-arg)) | |
367 | (let ((arg (next-arg))) | |
368 | (if (not (number? arg)) | |
369 | (format:error "~~p expects a number argument")) | |
370 | (if (= arg 1) | |
371 | (if (memq modifier '(at colon-at)) | |
372 | (format:out-char #\y)) | |
373 | (if (memq modifier '(at colon-at)) | |
374 | (format:out-str "ies") | |
375 | (format:out-char #\s)))) | |
376 | (anychar-dispatch)) | |
377 | ((#\~) ; Tilde | |
378 | (if (one-positive-integer? params) | |
379 | (format:out-fill (car params) #\~) | |
380 | (format:out-char #\~)) | |
381 | (anychar-dispatch)) | |
382 | ((#\%) ; Newline | |
383 | (if (one-positive-integer? params) | |
384 | (format:out-fill (car params) #\newline) | |
385 | (format:out-char #\newline)) | |
79f124ac | 386 | (set! output-col 0) |
8390dac0 AW |
387 | (anychar-dispatch)) |
388 | ((#\&) ; Fresh line | |
389 | (if (one-positive-integer? params) | |
390 | (begin | |
391 | (if (> (car params) 0) | |
392 | (format:out-fill (- (car params) | |
393 | (if (> | |
79f124ac | 394 | output-col |
8390dac0 AW |
395 | 0) 0 1)) |
396 | #\newline)) | |
79f124ac AW |
397 | (set! output-col 0)) |
398 | (if (> output-col 0) | |
8390dac0 AW |
399 | (format:out-char #\newline))) |
400 | (anychar-dispatch)) | |
401 | ((#\_) ; Space character | |
402 | (if (one-positive-integer? params) | |
403 | (format:out-fill (car params) #\space) | |
404 | (format:out-char #\space)) | |
405 | (anychar-dispatch)) | |
406 | ((#\/) ; Tabulator character | |
407 | (if (one-positive-integer? params) | |
408 | (format:out-fill (car params) #\tab) | |
409 | (format:out-char #\tab)) | |
410 | (anychar-dispatch)) | |
411 | ((#\|) ; Page seperator | |
412 | (if (one-positive-integer? params) | |
413 | (format:out-fill (car params) #\page) | |
414 | (format:out-char #\page)) | |
79f124ac | 415 | (set! output-col 0) |
8390dac0 AW |
416 | (anychar-dispatch)) |
417 | ((#\T) ; Tabulate | |
418 | (format:tabulate modifier params) | |
419 | (anychar-dispatch)) | |
420 | ((#\Y) ; Structured print | |
421 | (let ((width (if (one-positive-integer? params) | |
422 | (car params) | |
423 | 79))) | |
424 | (case modifier | |
425 | ((at) | |
426 | (format:out-str | |
6c922006 LC |
427 | (call-with-output-string |
428 | (lambda (p) | |
429 | (truncated-print (next-arg) p | |
8390dac0 AW |
430 | #:width width))))) |
431 | ((colon-at) | |
432 | (format:out-str | |
6c922006 LC |
433 | (call-with-output-string |
434 | (lambda (p) | |
435 | (truncated-print (next-arg) p | |
8390dac0 AW |
436 | #:width |
437 | (max (- width | |
79f124ac | 438 | output-col) |
8390dac0 AW |
439 | 1)))))) |
440 | ((colon) | |
441 | (format:error "illegal modifier in ~~?")) | |
442 | (else | |
79f124ac | 443 | (pretty-print (next-arg) port |
8390dac0 | 444 | #:width width) |
79f124ac | 445 | (set! output-col 0)))) |
8390dac0 AW |
446 | (anychar-dispatch)) |
447 | ((#\? #\K) ; Indirection (is "~K" in T-Scheme) | |
448 | (cond | |
449 | ((memq modifier '(colon colon-at)) | |
450 | (format:error "illegal modifier in ~~?")) | |
451 | ((eq? modifier 'at) | |
452 | (let* ((frmt (next-arg)) | |
453 | (args (rest-args))) | |
454 | (add-arg-pos (format:format-work frmt args)))) | |
455 | (else | |
456 | (let* ((frmt (next-arg)) | |
457 | (args (next-arg))) | |
458 | (format:format-work frmt args)))) | |
459 | (anychar-dispatch)) | |
460 | ((#\!) ; Flush output | |
b90b4b2b | 461 | (set! flush-output? #t) |
8390dac0 AW |
462 | (anychar-dispatch)) |
463 | ((#\newline) ; Continuation lines | |
464 | (if (eq? modifier 'at) | |
465 | (format:out-char #\newline)) | |
466 | (if (< format:pos format-string-len) | |
467 | (do ((ch (peek-next-char) (peek-next-char))) | |
468 | ((or (not (char-whitespace? ch)) | |
469 | (= format:pos (- format-string-len 1)))) | |
470 | (if (eq? modifier 'colon) | |
471 | (format:out-char (next-char)) | |
472 | (next-char)))) | |
473 | (anychar-dispatch)) | |
474 | ((#\*) ; Argument jumping | |
29d096c8 | 475 | (case modifier |
8390dac0 AW |
476 | ((colon) ; jump backwards |
477 | (if (one-positive-integer? params) | |
478 | (do ((i 0 (+ i 1))) | |
479 | ((= i (car params))) | |
480 | (prev-arg)) | |
481 | (prev-arg))) | |
482 | ((at) ; jump absolute | |
483 | (set! arg-pos (if (one-positive-integer? params) | |
484 | (car params) 0))) | |
29d096c8 | 485 | ((colon-at) |
8390dac0 AW |
486 | (format:error "illegal modifier `:@' in ~~* directive")) |
487 | (else ; jump forward | |
488 | (if (one-positive-integer? params) | |
489 | (do ((i 0 (+ i 1))) | |
490 | ((= i (car params))) | |
491 | (next-arg)) | |
492 | (next-arg)))) | |
493 | (anychar-dispatch)) | |
494 | ((#\() ; Case conversion begin | |
495 | (set! format:case-conversion | |
496 | (case modifier | |
497 | ((at) string-capitalize-first) | |
498 | ((colon) string-capitalize) | |
499 | ((colon-at) string-upcase) | |
500 | (else string-downcase))) | |
501 | (anychar-dispatch)) | |
502 | ((#\)) ; Case conversion end | |
503 | (if (not format:case-conversion) | |
504 | (format:error "missing ~~(")) | |
505 | (set! format:case-conversion #f) | |
506 | (anychar-dispatch)) | |
507 | ((#\[) ; Conditional begin | |
508 | (set! conditional-nest (+ conditional-nest 1)) | |
509 | (cond | |
510 | ((= conditional-nest 1) | |
511 | (set! clause-pos format:pos) | |
512 | (set! clause-default #f) | |
513 | (set! clauses '()) | |
514 | (set! conditional-type | |
515 | (case modifier | |
516 | ((at) 'if-then) | |
517 | ((colon) 'if-else-then) | |
518 | ((colon-at) (format:error "illegal modifier in ~~[")) | |
519 | (else 'num-case))) | |
520 | (set! conditional-arg | |
521 | (if (one-positive-integer? params) | |
522 | (car params) | |
523 | (next-arg))))) | |
524 | (anychar-dispatch)) | |
525 | ((#\;) ; Conditional separator | |
526 | (if (zero? conditional-nest) | |
527 | (format:error "~~; not in ~~[~~] conditional")) | |
528 | (if (not (null? params)) | |
529 | (format:error "no parameter allowed in ~~;")) | |
530 | (if (= conditional-nest 1) | |
531 | (let ((clause-str | |
532 | (cond | |
533 | ((eq? modifier 'colon) | |
534 | (set! clause-default #t) | |
535 | (substring format-string clause-pos | |
536 | (- format:pos 3))) | |
537 | ((memq modifier '(at colon-at)) | |
538 | (format:error "illegal modifier in ~~;")) | |
539 | (else | |
540 | (substring format-string clause-pos | |
541 | (- format:pos 2)))))) | |
542 | (set! clauses (append clauses (list clause-str))) | |
543 | (set! clause-pos format:pos))) | |
544 | (anychar-dispatch)) | |
545 | ((#\]) ; Conditional end | |
546 | (if (zero? conditional-nest) (format:error "missing ~~[")) | |
547 | (set! conditional-nest (- conditional-nest 1)) | |
548 | (if modifier | |
549 | (format:error "no modifier allowed in ~~]")) | |
550 | (if (not (null? params)) | |
551 | (format:error "no parameter allowed in ~~]")) | |
552 | (cond | |
553 | ((zero? conditional-nest) | |
554 | (let ((clause-str (substring format-string clause-pos | |
555 | (- format:pos 2)))) | |
556 | (if clause-default | |
557 | (set! clause-default clause-str) | |
558 | (set! clauses (append clauses (list clause-str))))) | |
559 | (case conditional-type | |
560 | ((if-then) | |
561 | (if conditional-arg | |
562 | (format:format-work (car clauses) | |
563 | (list conditional-arg)))) | |
564 | ((if-else-then) | |
565 | (add-arg-pos | |
566 | (format:format-work (if conditional-arg | |
567 | (cadr clauses) | |
568 | (car clauses)) | |
569 | (rest-args)))) | |
570 | ((num-case) | |
571 | (if (or (not (integer? conditional-arg)) | |
572 | (< conditional-arg 0)) | |
573 | (format:error "argument not a positive integer")) | |
574 | (if (not (and (>= conditional-arg (length clauses)) | |
575 | (not clause-default))) | |
576 | (add-arg-pos | |
577 | (format:format-work | |
578 | (if (>= conditional-arg (length clauses)) | |
579 | clause-default | |
580 | (list-ref clauses conditional-arg)) | |
581 | (rest-args)))))))) | |
582 | (anychar-dispatch)) | |
583 | ((#\{) ; Iteration begin | |
584 | (set! iteration-nest (+ iteration-nest 1)) | |
585 | (cond | |
586 | ((= iteration-nest 1) | |
587 | (set! iteration-pos format:pos) | |
588 | (set! iteration-type | |
589 | (case modifier | |
590 | ((at) 'rest-args) | |
591 | ((colon) 'sublists) | |
592 | ((colon-at) 'rest-sublists) | |
593 | (else 'list))) | |
594 | (set! max-iterations (if (one-positive-integer? params) | |
595 | (car params) #f)))) | |
596 | (anychar-dispatch)) | |
597 | ((#\}) ; Iteration end | |
598 | (if (zero? iteration-nest) (format:error "missing ~~{")) | |
599 | (set! iteration-nest (- iteration-nest 1)) | |
600 | (case modifier | |
29d096c8 | 601 | ((colon) |
8390dac0 AW |
602 | (if (not max-iterations) (set! max-iterations 1))) |
603 | ((colon-at at) (format:error "illegal modifier"))) | |
604 | (if (not (null? params)) | |
605 | (format:error "no parameters allowed in ~~}")) | |
606 | (if (zero? iteration-nest) | |
607 | (let ((iteration-str | |
608 | (substring format-string iteration-pos | |
609 | (- format:pos (if modifier 3 2))))) | |
610 | (if (string=? iteration-str "") | |
611 | (set! iteration-str (next-arg))) | |
612 | (case iteration-type | |
613 | ((list) | |
614 | (let ((args (next-arg)) | |
615 | (args-len 0)) | |
616 | (if (not (list? args)) | |
617 | (format:error "expected a list argument")) | |
618 | (set! args-len (length args)) | |
619 | (do ((arg-pos 0 (+ arg-pos | |
620 | (format:format-work | |
621 | iteration-str | |
622 | (list-tail args arg-pos)))) | |
623 | (i 0 (+ i 1))) | |
624 | ((or (>= arg-pos args-len) | |
625 | (and max-iterations | |
626 | (>= i max-iterations))))))) | |
627 | ((sublists) | |
628 | (let ((args (next-arg)) | |
629 | (args-len 0)) | |
630 | (if (not (list? args)) | |
631 | (format:error "expected a list argument")) | |
632 | (set! args-len (length args)) | |
633 | (do ((arg-pos 0 (+ arg-pos 1))) | |
634 | ((or (>= arg-pos args-len) | |
635 | (and max-iterations | |
636 | (>= arg-pos max-iterations)))) | |
637 | (let ((sublist (list-ref args arg-pos))) | |
638 | (if (not (list? sublist)) | |
639 | (format:error | |
640 | "expected a list of lists argument")) | |
641 | (format:format-work iteration-str sublist))))) | |
642 | ((rest-args) | |
643 | (let* ((args (rest-args)) | |
644 | (args-len (length args)) | |
645 | (usedup-args | |
646 | (do ((arg-pos 0 (+ arg-pos | |
647 | (format:format-work | |
648 | iteration-str | |
649 | (list-tail | |
650 | args arg-pos)))) | |
651 | (i 0 (+ i 1))) | |
652 | ((or (>= arg-pos args-len) | |
653 | (and max-iterations | |
654 | (>= i max-iterations))) | |
655 | arg-pos)))) | |
656 | (add-arg-pos usedup-args))) | |
657 | ((rest-sublists) | |
658 | (let* ((args (rest-args)) | |
659 | (args-len (length args)) | |
660 | (usedup-args | |
661 | (do ((arg-pos 0 (+ arg-pos 1))) | |
662 | ((or (>= arg-pos args-len) | |
663 | (and max-iterations | |
664 | (>= arg-pos max-iterations))) | |
665 | arg-pos) | |
666 | (let ((sublist (list-ref args arg-pos))) | |
667 | (if (not (list? sublist)) | |
668 | (format:error "expected list arguments")) | |
669 | (format:format-work iteration-str sublist))))) | |
670 | (add-arg-pos usedup-args))) | |
671 | (else (format:error "internal error in ~~}"))))) | |
672 | (anychar-dispatch)) | |
673 | ((#\^) ; Up and out | |
674 | (let* ((continue | |
675 | (cond | |
676 | ((not (null? params)) | |
677 | (not | |
678 | (case (length params) | |
679 | ((1) (zero? (car params))) | |
680 | ((2) (= (list-ref params 0) (list-ref params 1))) | |
681 | ((3) (<= (list-ref params 0) | |
682 | (list-ref params 1) | |
683 | (list-ref params 2))) | |
684 | (else (format:error "too much parameters"))))) | |
685 | (format:case-conversion ; if conversion stop conversion | |
686 | (set! format:case-conversion string-copy) #t) | |
687 | ((= iteration-nest 1) #t) | |
688 | ((= conditional-nest 1) #t) | |
689 | ((>= arg-pos arg-len) | |
690 | (set! format:pos format-string-len) #f) | |
691 | (else #t)))) | |
692 | (if continue | |
693 | (anychar-dispatch)))) | |
694 | ||
695 | ;; format directive modifiers and parameters | |
696 | ||
697 | ((#\@) ; `@' modifier | |
698 | (if (memq modifier '(at colon-at)) | |
699 | (format:error "double `@' modifier")) | |
700 | (set! modifier (if (eq? modifier 'colon) 'colon-at 'at)) | |
701 | (tilde-dispatch)) | |
702 | ((#\:) ; `:' modifier | |
703 | (if (memq modifier '(colon colon-at)) | |
704 | (format:error "double `:' modifier")) | |
705 | (set! modifier (if (eq? modifier 'at) 'colon-at 'colon)) | |
706 | (tilde-dispatch)) | |
707 | ((#\') ; Character parameter | |
708 | (if modifier (format:error "misplaced modifier")) | |
709 | (set! params (append params (list (char->integer (next-char))))) | |
710 | (set! param-value-found #t) | |
711 | (tilde-dispatch)) | |
712 | ((#\0 #\1 #\2 #\3 #\4 #\5 #\6 #\7 #\8 #\9 #\- #\+) ; num. paramtr | |
713 | (if modifier (format:error "misplaced modifier")) | |
714 | (let ((num-str-beg (- format:pos 1)) | |
715 | (num-str-end format:pos)) | |
29d096c8 | 716 | (do ((ch (peek-next-char) (peek-next-char))) |
8390dac0 AW |
717 | ((not (char-numeric? ch))) |
718 | (next-char) | |
719 | (set! num-str-end (+ 1 num-str-end))) | |
720 | (set! params | |
721 | (append params | |
722 | (list (string->number | |
723 | (substring format-string | |
724 | num-str-beg | |
725 | num-str-end)))))) | |
726 | (set! param-value-found #t) | |
727 | (tilde-dispatch)) | |
728 | ((#\V) ; Variable parameter from next argum. | |
729 | (if modifier (format:error "misplaced modifier")) | |
730 | (set! params (append params (list (next-arg)))) | |
731 | (set! param-value-found #t) | |
732 | (tilde-dispatch)) | |
733 | ((#\#) ; Parameter is number of remaining args | |
734 | (if param-value-found (format:error "misplaced '#'")) | |
735 | (if modifier (format:error "misplaced modifier")) | |
736 | (set! params (append params (list (length (rest-args))))) | |
737 | (set! param-value-found #t) | |
738 | (tilde-dispatch)) | |
739 | ((#\,) ; Parameter separators | |
740 | (if modifier (format:error "misplaced modifier")) | |
741 | (if (not param-value-found) | |
742 | (set! params (append params '(#f)))) ; append empty paramtr | |
743 | (set! param-value-found #f) | |
744 | (tilde-dispatch)) | |
745 | ((#\Q) ; Inquiry messages | |
746 | (if (eq? modifier 'colon) | |
747 | (format:out-str format:version) | |
748 | (let ((nl (string #\newline))) | |
749 | (format:out-str | |
750 | (string-append | |
751 | "SLIB Common LISP format version " format:version nl | |
752 | " (C) copyright 1992-1994 by Dirk Lutzebaeck" nl | |
753 | " please send bug reports to `lutzeb@cs.tu-berlin.de'" | |
754 | nl)))) | |
755 | (anychar-dispatch)) | |
756 | (else ; Unknown tilde directive | |
757 | (format:error "unknown control character `~c'" | |
758 | (string-ref format-string (- format:pos 1)))))) | |
759 | (else (anychar-dispatch)))))) ; in case of conditional | |
760 | ||
761 | (set! format:pos 0) | |
762 | (set! format:arg-pos 0) | |
763 | (anychar-dispatch) ; start the formatting | |
764 | (set! format:pos recursive-pos-save) | |
765 | arg-pos)) ; return the position in the arg. list | |
766 | ||
767 | ;; when format:read-proof is true, format:obj->str will wrap | |
768 | ;; result strings starting with "#<" in an extra pair of double | |
769 | ;; quotes. | |
a6b3219e | 770 | |
8390dac0 AW |
771 | (define format:read-proof #f) |
772 | ||
773 | ;; format:obj->str returns a R4RS representation as a string of | |
774 | ;; an arbitrary scheme object. | |
775 | ||
776 | (define (format:obj->str obj slashify) | |
777 | (let ((res (if slashify | |
778 | (object->string obj) | |
6c922006 | 779 | (call-with-output-string (lambda (p) (display obj p)))))) |
8390dac0 AW |
780 | (if (and format:read-proof (string-prefix? "#<" res)) |
781 | (object->string res) | |
782 | res))) | |
783 | ||
8390dac0 AW |
784 | (define format:space-ch (char->integer #\space)) |
785 | (define format:zero-ch (char->integer #\0)) | |
786 | ||
787 | (define (format:par pars length index default name) | |
788 | (if (> length index) | |
789 | (let ((par (list-ref pars index))) | |
790 | (if par | |
791 | (if name | |
792 | (if (< par 0) | |
793 | (format:error | |
794 | "~s parameter must be a positive integer" name) | |
795 | par) | |
796 | par) | |
797 | default)) | |
798 | default)) | |
799 | ||
800 | (define (format:out-obj-padded pad-left obj slashify pars) | |
801 | (if (null? pars) | |
802 | (format:out-str (format:obj->str obj slashify)) | |
803 | (let ((l (length pars))) | |
804 | (let ((mincol (format:par pars l 0 0 "mincol")) | |
805 | (colinc (format:par pars l 1 1 "colinc")) | |
806 | (minpad (format:par pars l 2 0 "minpad")) | |
29d096c8 | 807 | (padchar (integer->char |
8390dac0 AW |
808 | (format:par pars l 3 format:space-ch #f))) |
809 | (objstr (format:obj->str obj slashify))) | |
810 | (if (not pad-left) | |
811 | (format:out-str objstr)) | |
812 | (do ((objstr-len (string-length objstr)) | |
813 | (i minpad (+ i colinc))) | |
814 | ((>= (+ objstr-len i) mincol) | |
815 | (format:out-fill i padchar))) | |
816 | (if pad-left | |
817 | (format:out-str objstr)))))) | |
818 | ||
819 | (define (format:out-num-padded modifier number pars radix) | |
820 | (if (not (integer? number)) (format:error "argument not an integer")) | |
821 | (let ((numstr (number->string number radix))) | |
822 | (if (and (null? pars) (not modifier)) | |
823 | (format:out-str numstr) | |
824 | (let ((l (length pars)) | |
825 | (numstr-len (string-length numstr))) | |
826 | (let ((mincol (format:par pars l 0 #f "mincol")) | |
827 | (padchar (integer->char | |
828 | (format:par pars l 1 format:space-ch #f))) | |
829 | (commachar (integer->char | |
830 | (format:par pars l 2 (char->integer #\,) #f))) | |
831 | (commawidth (format:par pars l 3 3 "commawidth"))) | |
832 | (if mincol | |
833 | (let ((numlen numstr-len)) ; calc. the output len of number | |
834 | (if (and (memq modifier '(at colon-at)) (>= number 0)) | |
835 | (set! numlen (+ numlen 1))) | |
836 | (if (memq modifier '(colon colon-at)) | |
837 | (set! numlen (+ (quotient (- numstr-len | |
838 | (if (< number 0) 2 1)) | |
839 | commawidth) | |
840 | numlen))) | |
841 | (if (> mincol numlen) | |
842 | (format:out-fill (- mincol numlen) padchar)))) | |
843 | (if (and (memq modifier '(at colon-at)) | |
844 | (>= number 0)) | |
845 | (format:out-char #\+)) | |
846 | (if (memq modifier '(colon colon-at)) ; insert comma character | |
847 | (let ((start (remainder numstr-len commawidth)) | |
848 | (ns (if (< number 0) 1 0))) | |
849 | (format:out-substr numstr 0 start) | |
850 | (do ((i start (+ i commawidth))) | |
851 | ((>= i numstr-len)) | |
852 | (if (> i ns) | |
853 | (format:out-char commachar)) | |
854 | (format:out-substr numstr i (+ i commawidth)))) | |
855 | (format:out-str numstr))))))) | |
856 | ||
857 | (define (format:tabulate modifier pars) | |
858 | (let ((l (length pars))) | |
859 | (let ((colnum (format:par pars l 0 1 "colnum")) | |
860 | (colinc (format:par pars l 1 1 "colinc")) | |
861 | (padch (integer->char (format:par pars l 2 format:space-ch #f)))) | |
862 | (case modifier | |
863 | ((colon colon-at) | |
864 | (format:error "unsupported modifier for ~~t")) | |
865 | ((at) ; relative tabulation | |
866 | (format:out-fill | |
867 | (if (= colinc 0) | |
868 | colnum ; colnum = colrel | |
869 | (do ((c 0 (+ c colinc)) | |
79f124ac | 870 | (col (+ output-col colnum))) |
8390dac0 | 871 | ((>= c col) |
79f124ac | 872 | (- c output-col)))) |
8390dac0 AW |
873 | padch)) |
874 | (else ; absolute tabulation | |
875 | (format:out-fill | |
876 | (cond | |
79f124ac AW |
877 | ((< output-col colnum) |
878 | (- colnum output-col)) | |
8390dac0 AW |
879 | ((= colinc 0) |
880 | 0) | |
881 | (else | |
882 | (do ((c colnum (+ c colinc))) | |
79f124ac AW |
883 | ((>= c output-col) |
884 | (- c output-col))))) | |
8390dac0 AW |
885 | padch)))))) |
886 | ||
887 | ||
888 | ;; roman numerals (from dorai@cs.rice.edu). | |
889 | ||
890 | (define format:roman-alist | |
891 | '((1000 #\M) (500 #\D) (100 #\C) (50 #\L) | |
892 | (10 #\X) (5 #\V) (1 #\I))) | |
893 | ||
894 | (define format:roman-boundary-values | |
895 | '(100 100 10 10 1 1 #f)) | |
896 | ||
897 | (define (format:num->old-roman n) | |
898 | (if (and (integer? n) (>= n 1)) | |
899 | (let loop ((n n) | |
900 | (romans format:roman-alist) | |
901 | (s '())) | |
902 | (if (null? romans) (list->string (reverse s)) | |
903 | (let ((roman-val (caar romans)) | |
904 | (roman-dgt (cadar romans))) | |
905 | (do ((q (quotient n roman-val) (- q 1)) | |
906 | (s s (cons roman-dgt s))) | |
907 | ((= q 0) | |
908 | (loop (remainder n roman-val) | |
909 | (cdr romans) s)))))) | |
910 | (format:error "only positive integers can be romanized"))) | |
911 | ||
912 | (define (format:num->roman n) | |
913 | (if (and (integer? n) (> n 0)) | |
914 | (let loop ((n n) | |
915 | (romans format:roman-alist) | |
916 | (boundaries format:roman-boundary-values) | |
917 | (s '())) | |
918 | (if (null? romans) | |
919 | (list->string (reverse s)) | |
920 | (let ((roman-val (caar romans)) | |
921 | (roman-dgt (cadar romans)) | |
922 | (bdry (car boundaries))) | |
923 | (let loop2 ((q (quotient n roman-val)) | |
924 | (r (remainder n roman-val)) | |
925 | (s s)) | |
926 | (if (= q 0) | |
927 | (if (and bdry (>= r (- roman-val bdry))) | |
928 | (loop (remainder r bdry) (cdr romans) | |
929 | (cdr boundaries) | |
930 | (cons roman-dgt | |
931 | (append | |
932 | (cdr (assv bdry romans)) | |
933 | s))) | |
934 | (loop r (cdr romans) (cdr boundaries) s)) | |
935 | (loop2 (- q 1) r (cons roman-dgt s))))))) | |
936 | (format:error "only positive integers can be romanized"))) | |
937 | ||
938 | ;; cardinals & ordinals (from dorai@cs.rice.edu) | |
939 | ||
940 | (define format:cardinal-ones-list | |
941 | '(#f "one" "two" "three" "four" "five" | |
942 | "six" "seven" "eight" "nine" "ten" "eleven" "twelve" "thirteen" | |
943 | "fourteen" "fifteen" "sixteen" "seventeen" "eighteen" | |
944 | "nineteen")) | |
945 | ||
946 | (define format:cardinal-tens-list | |
947 | '(#f #f "twenty" "thirty" "forty" "fifty" "sixty" "seventy" "eighty" | |
948 | "ninety")) | |
949 | ||
950 | (define (format:num->cardinal999 n) | |
951 | ;; this procedure is inspired by the Bruno Haible's CLisp | |
952 | ;; function format-small-cardinal, which converts numbers | |
953 | ;; in the range 1 to 999, and is used for converting each | |
954 | ;; thousand-block in a larger number | |
955 | (let* ((hundreds (quotient n 100)) | |
956 | (tens+ones (remainder n 100)) | |
957 | (tens (quotient tens+ones 10)) | |
958 | (ones (remainder tens+ones 10))) | |
959 | (append | |
960 | (if (> hundreds 0) | |
961 | (append | |
962 | (string->list | |
963 | (list-ref format:cardinal-ones-list hundreds)) | |
964 | (string->list" hundred") | |
965 | (if (> tens+ones 0) '(#\space) '())) | |
966 | '()) | |
967 | (if (< tens+ones 20) | |
968 | (if (> tens+ones 0) | |
969 | (string->list | |
970 | (list-ref format:cardinal-ones-list tens+ones)) | |
971 | '()) | |
972 | (append | |
973 | (string->list | |
974 | (list-ref format:cardinal-tens-list tens)) | |
975 | (if (> ones 0) | |
976 | (cons #\- | |
977 | (string->list | |
978 | (list-ref format:cardinal-ones-list ones))) | |
979 | '())))))) | |
980 | ||
981 | (define format:cardinal-thousand-block-list | |
982 | '("" " thousand" " million" " billion" " trillion" " quadrillion" | |
983 | " quintillion" " sextillion" " septillion" " octillion" " nonillion" | |
984 | " decillion" " undecillion" " duodecillion" " tredecillion" | |
985 | " quattuordecillion" " quindecillion" " sexdecillion" " septendecillion" | |
986 | " octodecillion" " novemdecillion" " vigintillion")) | |
987 | ||
988 | (define (format:num->cardinal n) | |
989 | (cond ((not (integer? n)) | |
990 | (format:error | |
991 | "only integers can be converted to English cardinals")) | |
992 | ((= n 0) "zero") | |
993 | ((< n 0) (string-append "minus " (format:num->cardinal (- n)))) | |
994 | (else | |
995 | (let ((power3-word-limit | |
996 | (length format:cardinal-thousand-block-list))) | |
997 | (let loop ((n n) | |
998 | (power3 0) | |
999 | (s '())) | |
1000 | (if (= n 0) | |
1001 | (list->string s) | |
1002 | (let ((n-before-block (quotient n 1000)) | |
1003 | (n-after-block (remainder n 1000))) | |
1004 | (loop n-before-block | |
1005 | (+ power3 1) | |
1006 | (if (> n-after-block 0) | |
1007 | (append | |
1008 | (if (> n-before-block 0) | |
1009 | (string->list ", ") '()) | |
1010 | (format:num->cardinal999 n-after-block) | |
1011 | (if (< power3 power3-word-limit) | |
1012 | (string->list | |
1013 | (list-ref | |
1014 | format:cardinal-thousand-block-list | |
1015 | power3)) | |
29d096c8 | 1016 | (append |
8390dac0 AW |
1017 | (string->list " times ten to the ") |
1018 | (string->list | |
1019 | (format:num->ordinal | |
1020 | (* power3 3))) | |
1021 | (string->list " power"))) | |
1022 | s) | |
1023 | s))))))))) | |
1024 | ||
1025 | (define format:ordinal-ones-list | |
1026 | '(#f "first" "second" "third" "fourth" "fifth" | |
1027 | "sixth" "seventh" "eighth" "ninth" "tenth" "eleventh" "twelfth" | |
1028 | "thirteenth" "fourteenth" "fifteenth" "sixteenth" "seventeenth" | |
1029 | "eighteenth" "nineteenth")) | |
1030 | ||
1031 | (define format:ordinal-tens-list | |
1032 | '(#f #f "twentieth" "thirtieth" "fortieth" "fiftieth" "sixtieth" | |
1033 | "seventieth" "eightieth" "ninetieth")) | |
1034 | ||
1035 | (define (format:num->ordinal n) | |
1036 | (cond ((not (integer? n)) | |
1037 | (format:error | |
1038 | "only integers can be converted to English ordinals")) | |
1039 | ((= n 0) "zeroth") | |
1040 | ((< n 0) (string-append "minus " (format:num->ordinal (- n)))) | |
1041 | (else | |
1042 | (let ((hundreds (quotient n 100)) | |
1043 | (tens+ones (remainder n 100))) | |
1044 | (string-append | |
1045 | (if (> hundreds 0) | |
1046 | (string-append | |
1047 | (format:num->cardinal (* hundreds 100)) | |
1048 | (if (= tens+ones 0) "th" " ")) | |
1049 | "") | |
1050 | (if (= tens+ones 0) "" | |
1051 | (if (< tens+ones 20) | |
1052 | (list-ref format:ordinal-ones-list tens+ones) | |
1053 | (let ((tens (quotient tens+ones 10)) | |
1054 | (ones (remainder tens+ones 10))) | |
1055 | (if (= ones 0) | |
1056 | (list-ref format:ordinal-tens-list tens) | |
1057 | (string-append | |
1058 | (list-ref format:cardinal-tens-list tens) | |
1059 | "-" | |
1060 | (list-ref format:ordinal-ones-list ones)))) | |
1061 | ))))))) | |
1062 | ||
1063 | ;; format inf and nan. | |
1064 | ||
1065 | (define (format:out-inf-nan number width digits edigits overch padch) | |
1066 | ;; inf and nan are always printed exactly as "+inf.0", "-inf.0" or | |
1067 | ;; "+nan.0", suitably justified in their field. We insist on | |
1068 | ;; printing this exact form so that the numbers can be read back in. | |
1069 | (let* ((str (number->string number)) | |
1070 | (len (string-length str)) | |
1071 | (dot (string-index str #\.)) | |
1072 | (digits (+ (or digits 0) | |
1073 | (if edigits (+ edigits 2) 0)))) | |
1074 | (if (and width overch (< width len)) | |
1075 | (format:out-fill width (integer->char overch)) | |
1076 | (let* ((leftpad (if width | |
1077 | (max (- width (max len (+ dot 1 digits))) 0) | |
1078 | 0)) | |
1079 | (rightpad (if width | |
1080 | (max (- width leftpad len) 0) | |
1081 | 0)) | |
1082 | (padch (integer->char (or padch format:space-ch)))) | |
1083 | (format:out-fill leftpad padch) | |
1084 | (format:out-str str) | |
1085 | (format:out-fill rightpad padch))))) | |
1086 | ||
1087 | ;; format fixed flonums (~F) | |
1088 | ||
1089 | (define (format:out-fixed modifier number pars) | |
1090 | (if (not (or (number? number) (string? number))) | |
1091 | (format:error "argument is not a number or a number string")) | |
1092 | ||
1093 | (let ((l (length pars))) | |
1094 | (let ((width (format:par pars l 0 #f "width")) | |
1095 | (digits (format:par pars l 1 #f "digits")) | |
1096 | (scale (format:par pars l 2 0 #f)) | |
1097 | (overch (format:par pars l 3 #f #f)) | |
1098 | (padch (format:par pars l 4 format:space-ch #f))) | |
1099 | ||
1100 | (cond | |
6a07a061 MW |
1101 | ((and (number? number) |
1102 | (or (inf? number) (nan? number))) | |
8390dac0 AW |
1103 | (format:out-inf-nan number width digits #f overch padch)) |
1104 | ||
1105 | (digits | |
1106 | (format:parse-float number #t scale) | |
29d096c8 AW |
1107 | (if (<= (- format:fn-len format:fn-dot) digits) |
1108 | (format:fn-zfill #f (- digits (- format:fn-len format:fn-dot))) | |
1109 | (format:fn-round digits)) | |
8390dac0 AW |
1110 | (if width |
1111 | (let ((numlen (+ format:fn-len 1))) | |
1112 | (if (or (not format:fn-pos?) (eq? modifier 'at)) | |
1113 | (set! numlen (+ numlen 1))) | |
1114 | (if (and (= format:fn-dot 0) (> width (+ digits 1))) | |
1115 | (set! numlen (+ numlen 1))) | |
1116 | (if (< numlen width) | |
1117 | (format:out-fill (- width numlen) (integer->char padch))) | |
1118 | (if (and overch (> numlen width)) | |
1119 | (format:out-fill width (integer->char overch)) | |
1120 | (format:fn-out modifier (> width (+ digits 1))))) | |
1121 | (format:fn-out modifier #t))) | |
1122 | ||
1123 | (else | |
1124 | (format:parse-float number #t scale) | |
1125 | (format:fn-strip) | |
1126 | (if width | |
1127 | (let ((numlen (+ format:fn-len 1))) | |
1128 | (if (or (not format:fn-pos?) (eq? modifier 'at)) | |
1129 | (set! numlen (+ numlen 1))) | |
1130 | (if (= format:fn-dot 0) | |
1131 | (set! numlen (+ numlen 1))) | |
1132 | (if (< numlen width) | |
1133 | (format:out-fill (- width numlen) (integer->char padch))) | |
1134 | (if (> numlen width) ; adjust precision if possible | |
1135 | (let ((dot-index (- numlen | |
1136 | (- format:fn-len format:fn-dot)))) | |
1137 | (if (> dot-index width) | |
1138 | (if overch ; numstr too big for required width | |
1139 | (format:out-fill width (integer->char overch)) | |
1140 | (format:fn-out modifier #t)) | |
1141 | (begin | |
1142 | (format:fn-round (- width dot-index)) | |
1143 | (format:fn-out modifier #t)))) | |
1144 | (format:fn-out modifier #t))) | |
1145 | (format:fn-out modifier #t))))))) | |
1146 | ||
1147 | ;; format exponential flonums (~E) | |
1148 | ||
1149 | (define (format:out-expon modifier number pars) | |
1150 | (if (not (or (number? number) (string? number))) | |
1151 | (format:error "argument is not a number")) | |
1152 | ||
1153 | (let ((l (length pars))) | |
1154 | (let ((width (format:par pars l 0 #f "width")) | |
1155 | (digits (format:par pars l 1 #f "digits")) | |
1156 | (edigits (format:par pars l 2 #f "exponent digits")) | |
1157 | (scale (format:par pars l 3 1 #f)) | |
1158 | (overch (format:par pars l 4 #f #f)) | |
1159 | (padch (format:par pars l 5 format:space-ch #f)) | |
1160 | (expch (format:par pars l 6 #f #f))) | |
1161 | ||
1162 | (cond | |
6a07a061 MW |
1163 | ((and (number? number) |
1164 | (or (inf? number) (nan? number))) | |
8390dac0 AW |
1165 | (format:out-inf-nan number width digits edigits overch padch)) |
1166 | ||
1167 | (digits ; fixed precision | |
1168 | ||
1169 | (let ((digits (if (> scale 0) | |
1170 | (if (< scale (+ digits 2)) | |
1171 | (+ (- digits scale) 1) | |
1172 | 0) | |
1173 | digits))) | |
1174 | (format:parse-float number #f scale) | |
1175 | (if (<= (- format:fn-len format:fn-dot) digits) | |
1176 | (format:fn-zfill #f (- digits (- format:fn-len format:fn-dot))) | |
1177 | (format:fn-round digits)) | |
1178 | (if width | |
1179 | (if (and edigits overch (> format:en-len edigits)) | |
1180 | (format:out-fill width (integer->char overch)) | |
1181 | (let ((numlen (+ format:fn-len 3))) ; .E+ | |
1182 | (if (or (not format:fn-pos?) (eq? modifier 'at)) | |
1183 | (set! numlen (+ numlen 1))) | |
1184 | (if (and (= format:fn-dot 0) (> width (+ digits 1))) | |
1185 | (set! numlen (+ numlen 1))) | |
1186 | (set! numlen | |
1187 | (+ numlen | |
1188 | (if (and edigits (>= edigits format:en-len)) | |
1189 | edigits | |
1190 | format:en-len))) | |
1191 | (if (< numlen width) | |
1192 | (format:out-fill (- width numlen) | |
1193 | (integer->char padch))) | |
1194 | (if (and overch (> numlen width)) | |
1195 | (format:out-fill width (integer->char overch)) | |
1196 | (begin | |
1197 | (format:fn-out modifier (> width (- numlen 1))) | |
1198 | (format:en-out edigits expch))))) | |
1199 | (begin | |
1200 | (format:fn-out modifier #t) | |
1201 | (format:en-out edigits expch))))) | |
1202 | ||
1203 | (else | |
1204 | (format:parse-float number #f scale) | |
1205 | (format:fn-strip) | |
29d096c8 AW |
1206 | (if width |
1207 | (if (and edigits overch (> format:en-len edigits)) | |
1208 | (format:out-fill width (integer->char overch)) | |
1209 | (let ((numlen (+ format:fn-len 3))) ; .E+ | |
1210 | (if (or (not format:fn-pos?) (eq? modifier 'at)) | |
1211 | (set! numlen (+ numlen 1))) | |
8390dac0 AW |
1212 | (if (= format:fn-dot 0) |
1213 | (set! numlen (+ numlen 1))) | |
29d096c8 | 1214 | (set! numlen |
8390dac0 | 1215 | (+ numlen |
29d096c8 AW |
1216 | (if (and edigits (>= edigits format:en-len)) |
1217 | edigits | |
1218 | format:en-len))) | |
1219 | (if (< numlen width) | |
1220 | (format:out-fill (- width numlen) | |
1221 | (integer->char padch))) | |
8390dac0 AW |
1222 | (if (> numlen width) ; adjust precision if possible |
1223 | (let ((f (- format:fn-len format:fn-dot))) ; fract len | |
1224 | (if (> (- numlen f) width) | |
1225 | (if overch ; numstr too big for required width | |
1226 | (format:out-fill width | |
1227 | (integer->char overch)) | |
1228 | (begin | |
1229 | (format:fn-out modifier #t) | |
1230 | (format:en-out edigits expch))) | |
1231 | (begin | |
1232 | (format:fn-round (+ (- f numlen) width)) | |
1233 | (format:fn-out modifier #t) | |
1234 | (format:en-out edigits expch)))) | |
29d096c8 | 1235 | (begin |
8390dac0 | 1236 | (format:fn-out modifier #t) |
29d096c8 AW |
1237 | (format:en-out edigits expch))))) |
1238 | (begin | |
1239 | (format:fn-out modifier #t) | |
8390dac0 | 1240 | (format:en-out edigits expch)))))))) |
093d2ca9 | 1241 | |
8390dac0 AW |
1242 | ;; format general flonums (~G) |
1243 | ||
1244 | (define (format:out-general modifier number pars) | |
1245 | (if (not (or (number? number) (string? number))) | |
1246 | (format:error "argument is not a number or a number string")) | |
1247 | ||
1248 | (let ((l (length pars))) | |
1249 | (let ((width (if (> l 0) (list-ref pars 0) #f)) | |
1250 | (digits (if (> l 1) (list-ref pars 1) #f)) | |
1251 | (edigits (if (> l 2) (list-ref pars 2) #f)) | |
1252 | (overch (if (> l 4) (list-ref pars 4) #f)) | |
1253 | (padch (if (> l 5) (list-ref pars 5) #f))) | |
1254 | (cond | |
6a07a061 MW |
1255 | ((and (number? number) |
1256 | (or (inf? number) (nan? number))) | |
8390dac0 AW |
1257 | ;; FIXME: this isn't right. |
1258 | (format:out-inf-nan number width digits edigits overch padch)) | |
1259 | (else | |
1260 | (format:parse-float number #t 0) | |
1261 | (format:fn-strip) | |
1262 | (let* ((ee (if edigits (+ edigits 2) 4)) ; for the following algorithm | |
1263 | (ww (if width (- width ee) #f)) ; see Steele's CL book p.395 | |
1264 | (n (if (= format:fn-dot 0) ; number less than (abs 1.0) ? | |
1265 | (- (format:fn-zlead)) | |
1266 | format:fn-dot)) | |
1267 | (d (if digits | |
1268 | digits | |
1269 | (max format:fn-len (min n 7)))) ; q = format:fn-len | |
1270 | (dd (- d n))) | |
1271 | (if (<= 0 dd d) | |
1272 | (begin | |
1273 | (format:out-fixed modifier number (list ww dd #f overch padch)) | |
1274 | (format:out-fill ee #\space)) ;~@T not implemented yet | |
1275 | (format:out-expon modifier number pars)))))))) | |
1276 | ||
1277 | ;; format dollar flonums (~$) | |
1278 | ||
1279 | (define (format:out-dollar modifier number pars) | |
1280 | (if (not (or (number? number) (string? number))) | |
1281 | (format:error "argument is not a number or a number string")) | |
1282 | ||
1283 | (let ((l (length pars))) | |
1284 | (let ((digits (format:par pars l 0 2 "digits")) | |
1285 | (mindig (format:par pars l 1 1 "mindig")) | |
1286 | (width (format:par pars l 2 0 "width")) | |
1287 | (padch (format:par pars l 3 format:space-ch #f))) | |
1288 | ||
1289 | (cond | |
6a07a061 MW |
1290 | ((and (number? number) |
1291 | (or (inf? number) (nan? number))) | |
8390dac0 AW |
1292 | (format:out-inf-nan number width digits #f #f padch)) |
1293 | ||
1294 | (else | |
1295 | (format:parse-float number #t 0) | |
1296 | (if (<= (- format:fn-len format:fn-dot) digits) | |
1297 | (format:fn-zfill #f (- digits (- format:fn-len format:fn-dot))) | |
1298 | (format:fn-round digits)) | |
1299 | (let ((numlen (+ format:fn-len 1))) | |
1300 | (if (or (not format:fn-pos?) (memq modifier '(at colon-at))) | |
1301 | (set! numlen (+ numlen 1))) | |
1302 | (if (and mindig (> mindig format:fn-dot)) | |
1303 | (set! numlen (+ numlen (- mindig format:fn-dot)))) | |
1304 | (if (and (= format:fn-dot 0) (not mindig)) | |
1305 | (set! numlen (+ numlen 1))) | |
1306 | (if (< numlen width) | |
1307 | (case modifier | |
1308 | ((colon) | |
1309 | (if (not format:fn-pos?) | |
1310 | (format:out-char #\-)) | |
1311 | (format:out-fill (- width numlen) (integer->char padch))) | |
1312 | ((at) | |
1313 | (format:out-fill (- width numlen) (integer->char padch)) | |
1314 | (format:out-char (if format:fn-pos? #\+ #\-))) | |
1315 | ((colon-at) | |
1316 | (format:out-char (if format:fn-pos? #\+ #\-)) | |
1317 | (format:out-fill (- width numlen) (integer->char padch))) | |
1318 | (else | |
1319 | (format:out-fill (- width numlen) (integer->char padch)) | |
1320 | (if (not format:fn-pos?) | |
1321 | (format:out-char #\-)))) | |
1322 | (if format:fn-pos? | |
1323 | (if (memq modifier '(at colon-at)) (format:out-char #\+)) | |
1324 | (format:out-char #\-)))) | |
29d096c8 | 1325 | (if (and mindig (> mindig format:fn-dot)) |
8390dac0 | 1326 | (format:out-fill (- mindig format:fn-dot) #\0)) |
29d096c8 | 1327 | (if (and (= format:fn-dot 0) (not mindig)) |
8390dac0 AW |
1328 | (format:out-char #\0)) |
1329 | (format:out-substr format:fn-str 0 format:fn-dot) | |
1330 | (format:out-char #\.) | |
1331 | (format:out-substr format:fn-str format:fn-dot format:fn-len)))))) | |
093d2ca9 MV |
1332 | |
1333 | ; the flonum buffers | |
1334 | ||
8390dac0 AW |
1335 | (define format:fn-max 400) ; max. number of number digits |
1336 | (define format:fn-str (make-string format:fn-max)) ; number buffer | |
1337 | (define format:fn-len 0) ; digit length of number | |
1338 | (define format:fn-dot #f) ; dot position of number | |
1339 | (define format:fn-pos? #t) ; number positive? | |
1340 | (define format:en-max 10) ; max. number of exponent digits | |
1341 | (define format:en-str (make-string format:en-max)) ; exponent buffer | |
1342 | (define format:en-len 0) ; digit length of exponent | |
1343 | (define format:en-pos? #t) ; exponent positive? | |
1344 | ||
1345 | (define (format:parse-float num fixed? scale) | |
1346 | (let ((num-str (if (string? num) | |
1347 | num | |
1348 | (number->string (exact->inexact num))))) | |
1349 | (set! format:fn-pos? #t) | |
1350 | (set! format:fn-len 0) | |
1351 | (set! format:fn-dot #f) | |
1352 | (set! format:en-pos? #t) | |
1353 | (set! format:en-len 0) | |
1354 | (do ((i 0 (+ i 1)) | |
1355 | (left-zeros 0) | |
1356 | (mantissa? #t) | |
1357 | (all-zeros? #t) | |
1358 | (num-len (string-length num-str)) | |
1359 | (c #f)) ; current exam. character in num-str | |
1360 | ((= i num-len) | |
1361 | (if (not format:fn-dot) | |
1362 | (set! format:fn-dot format:fn-len)) | |
1363 | ||
1364 | (if all-zeros? | |
1365 | (begin | |
1366 | (set! left-zeros 0) | |
1367 | (set! format:fn-dot 0) | |
1368 | (set! format:fn-len 1))) | |
1369 | ||
1370 | ;; now format the parsed values according to format's need | |
1371 | ||
1372 | (if fixed? | |
1373 | ||
1374 | (begin ; fixed format m.nnn or .nnn | |
1375 | (if (and (> left-zeros 0) (> format:fn-dot 0)) | |
1376 | (if (> format:fn-dot left-zeros) | |
1377 | (begin ; norm 0{0}nn.mm to nn.mm | |
1378 | (format:fn-shiftleft left-zeros) | |
1379 | (set! format:fn-dot (- format:fn-dot left-zeros)) | |
1380 | (set! left-zeros 0)) | |
1381 | (begin ; normalize 0{0}.nnn to .nnn | |
1382 | (format:fn-shiftleft format:fn-dot) | |
1383 | (set! left-zeros (- left-zeros format:fn-dot)) | |
1384 | (set! format:fn-dot 0)))) | |
1385 | (if (or (not (= scale 0)) (> format:en-len 0)) | |
1386 | (let ((shift (+ scale (format:en-int)))) | |
1387 | (cond | |
1388 | (all-zeros? #t) | |
1389 | ((> (+ format:fn-dot shift) format:fn-len) | |
1390 | (format:fn-zfill | |
1391 | #f (- shift (- format:fn-len format:fn-dot))) | |
1392 | (set! format:fn-dot format:fn-len)) | |
1393 | ((< (+ format:fn-dot shift) 0) | |
1394 | (format:fn-zfill #t (- (- shift) format:fn-dot)) | |
1395 | (set! format:fn-dot 0)) | |
1396 | (else | |
1397 | (if (> left-zeros 0) | |
1398 | (if (<= left-zeros shift) ; shift always > 0 here | |
1399 | (format:fn-shiftleft shift) ; shift out 0s | |
1400 | (begin | |
1401 | (format:fn-shiftleft left-zeros) | |
1402 | (set! format:fn-dot (- shift left-zeros)))) | |
1403 | (set! format:fn-dot (+ format:fn-dot shift)))))))) | |
1404 | ||
1405 | (let ((negexp ; expon format m.nnnEee | |
1406 | (if (> left-zeros 0) | |
1407 | (- left-zeros format:fn-dot -1) | |
1408 | (if (= format:fn-dot 0) 1 0)))) | |
1409 | (if (> left-zeros 0) | |
1410 | (begin ; normalize 0{0}.nnn to n.nn | |
1411 | (format:fn-shiftleft left-zeros) | |
1412 | (set! format:fn-dot 1)) | |
1413 | (if (= format:fn-dot 0) | |
1414 | (set! format:fn-dot 1))) | |
1415 | (format:en-set (- (+ (- format:fn-dot scale) (format:en-int)) | |
1416 | negexp)) | |
1417 | (cond | |
1418 | (all-zeros? | |
1419 | (format:en-set 0) | |
1420 | (set! format:fn-dot 1)) | |
1421 | ((< scale 0) ; leading zero | |
1422 | (format:fn-zfill #t (- scale)) | |
1423 | (set! format:fn-dot 0)) | |
1424 | ((> scale format:fn-dot) | |
1425 | (format:fn-zfill #f (- scale format:fn-dot)) | |
1426 | (set! format:fn-dot scale)) | |
1427 | (else | |
1428 | (set! format:fn-dot scale))))) | |
1429 | #t) | |
1430 | ||
1431 | ;; do body | |
1432 | (set! c (string-ref num-str i)) ; parse the output of number->string | |
1433 | (cond ; which can be any valid number | |
1434 | ((char-numeric? c) ; representation of R4RS except | |
1435 | (if mantissa? ; complex numbers | |
1436 | (begin | |
1437 | (if (char=? c #\0) | |
1438 | (if all-zeros? | |
1439 | (set! left-zeros (+ left-zeros 1))) | |
1440 | (begin | |
1441 | (set! all-zeros? #f))) | |
1442 | (string-set! format:fn-str format:fn-len c) | |
1443 | (set! format:fn-len (+ format:fn-len 1))) | |
1444 | (begin | |
1445 | (string-set! format:en-str format:en-len c) | |
1446 | (set! format:en-len (+ format:en-len 1))))) | |
1447 | ((or (char=? c #\-) (char=? c #\+)) | |
1448 | (if mantissa? | |
1449 | (set! format:fn-pos? (char=? c #\+)) | |
1450 | (set! format:en-pos? (char=? c #\+)))) | |
1451 | ((char=? c #\.) | |
1452 | (set! format:fn-dot format:fn-len)) | |
1453 | ((char=? c #\e) | |
1454 | (set! mantissa? #f)) | |
1455 | ((char=? c #\E) | |
1456 | (set! mantissa? #f)) | |
1457 | ((char-whitespace? c) #t) | |
1458 | ((char=? c #\d) #t) ; decimal radix prefix | |
1459 | ((char=? c #\#) #t) | |
1460 | (else | |
1461 | (format:error "illegal character `~c' in number->string" c)))))) | |
1462 | ||
1463 | (define (format:en-int) ; convert exponent string to integer | |
1464 | (if (= format:en-len 0) | |
1465 | 0 | |
1466 | (do ((i 0 (+ i 1)) | |
1467 | (n 0)) | |
1468 | ((= i format:en-len) | |
1469 | (if format:en-pos? | |
1470 | n | |
1471 | (- n))) | |
1472 | (set! n (+ (* n 10) (- (char->integer (string-ref format:en-str i)) | |
1473 | format:zero-ch)))))) | |
1474 | ||
1475 | (define (format:en-set en) ; set exponent string number | |
29d096c8 | 1476 | (set! format:en-len 0) |
8390dac0 AW |
1477 | (set! format:en-pos? (>= en 0)) |
1478 | (let ((en-str (number->string en))) | |
1479 | (do ((i 0 (+ i 1)) | |
1480 | (en-len (string-length en-str)) | |
1481 | (c #f)) | |
1482 | ((= i en-len)) | |
1483 | (set! c (string-ref en-str i)) | |
1484 | (if (char-numeric? c) | |
29d096c8 AW |
1485 | (begin |
1486 | (string-set! format:en-str format:en-len c) | |
8390dac0 AW |
1487 | (set! format:en-len (+ format:en-len 1))))))) |
1488 | ||
1489 | (define (format:fn-zfill left? n) ; fill current number string with 0s | |
1490 | (if (> (+ n format:fn-len) format:fn-max) ; from the left or right | |
1491 | (format:error "number is too long to format (enlarge format:fn-max)")) | |
1492 | (set! format:fn-len (+ format:fn-len n)) | |
1493 | (if left? | |
1494 | (do ((i format:fn-len (- i 1))) ; fill n 0s to left | |
1495 | ((< i 0)) | |
1496 | (string-set! format:fn-str i | |
1497 | (if (< i n) | |
1498 | #\0 | |
1499 | (string-ref format:fn-str (- i n))))) | |
1500 | (do ((i (- format:fn-len n) (+ i 1))) ; fill n 0s to the right | |
1501 | ((= i format:fn-len)) | |
1502 | (string-set! format:fn-str i #\0)))) | |
1503 | ||
1504 | (define (format:fn-shiftleft n) ; shift left current number n positions | |
1505 | (if (> n format:fn-len) | |
1506 | (format:error "internal error in format:fn-shiftleft (~d,~d)" | |
1507 | n format:fn-len)) | |
1508 | (do ((i n (+ i 1))) | |
1509 | ((= i format:fn-len) | |
1510 | (set! format:fn-len (- format:fn-len n))) | |
1511 | (string-set! format:fn-str (- i n) (string-ref format:fn-str i)))) | |
1512 | ||
1513 | (define (format:fn-round digits) ; round format:fn-str | |
1514 | (set! digits (+ digits format:fn-dot)) | |
1515 | (do ((i digits (- i 1)) ; "099",2 -> "10" | |
1516 | (c 5)) ; "023",2 -> "02" | |
1517 | ((or (= c 0) (< i 0)) ; "999",2 -> "100" | |
1518 | (if (= c 1) ; "005",2 -> "01" | |
1519 | (begin ; carry overflow | |
1520 | (set! format:fn-len digits) | |
1521 | (format:fn-zfill #t 1) ; add a 1 before fn-str | |
1522 | (string-set! format:fn-str 0 #\1) | |
1523 | (set! format:fn-dot (+ format:fn-dot 1))) | |
1524 | (set! format:fn-len digits))) | |
1525 | (set! c (+ (- (char->integer (string-ref format:fn-str i)) | |
1526 | format:zero-ch) c)) | |
1527 | (string-set! format:fn-str i (integer->char | |
1528 | (if (< c 10) | |
1529 | (+ c format:zero-ch) | |
1530 | (+ (- c 10) format:zero-ch)))) | |
1531 | (set! c (if (< c 10) 0 1)))) | |
1532 | ||
1533 | (define (format:fn-out modifier add-leading-zero?) | |
1534 | (if format:fn-pos? | |
1535 | (if (eq? modifier 'at) | |
1536 | (format:out-char #\+)) | |
1537 | (format:out-char #\-)) | |
1538 | (if (= format:fn-dot 0) | |
1539 | (if add-leading-zero? | |
1540 | (format:out-char #\0)) | |
1541 | (format:out-substr format:fn-str 0 format:fn-dot)) | |
1542 | (format:out-char #\.) | |
1543 | (format:out-substr format:fn-str format:fn-dot format:fn-len)) | |
1544 | ||
1545 | (define (format:en-out edigits expch) | |
1546 | (format:out-char (if expch (integer->char expch) #\E)) | |
1547 | (format:out-char (if format:en-pos? #\+ #\-)) | |
1548 | (if edigits | |
1549 | (if (< format:en-len edigits) | |
1550 | (format:out-fill (- edigits format:en-len) #\0))) | |
1551 | (format:out-substr format:en-str 0 format:en-len)) | |
1552 | ||
1553 | (define (format:fn-strip) ; strip trailing zeros but one | |
1554 | (string-set! format:fn-str format:fn-len #\0) | |
1555 | (do ((i format:fn-len (- i 1))) | |
1556 | ((or (not (char=? (string-ref format:fn-str i) #\0)) | |
1557 | (<= i format:fn-dot)) | |
1558 | (set! format:fn-len (+ i 1))))) | |
1559 | ||
1560 | (define (format:fn-zlead) ; count leading zeros | |
1561 | (do ((i 0 (+ i 1))) | |
1562 | ((or (= i format:fn-len) | |
1563 | (not (char=? (string-ref format:fn-str i) #\0))) | |
1564 | (if (= i format:fn-len) ; found a real zero | |
1565 | 0 | |
1566 | i)))) | |
7da43e41 | 1567 | |
7da43e41 | 1568 | |
093d2ca9 | 1569 | ;;; some global functions not found in SLIB |
7da43e41 | 1570 | |
8390dac0 AW |
1571 | (define (string-capitalize-first str) ; "hello" -> "Hello" |
1572 | (let ((cap-str (string-copy str)) ; "hELLO" -> "Hello" | |
1573 | (non-first-alpha #f) ; "*hello" -> "*Hello" | |
1574 | (str-len (string-length str))) ; "hello you" -> "Hello you" | |
1575 | (do ((i 0 (+ i 1))) | |
1576 | ((= i str-len) cap-str) | |
1577 | (let ((c (string-ref str i))) | |
1578 | (if (char-alphabetic? c) | |
1579 | (if non-first-alpha | |
1580 | (string-set! cap-str i (char-downcase c)) | |
1581 | (begin | |
1582 | (set! non-first-alpha #t) | |
1583 | (string-set! cap-str i (char-upcase c))))))))) | |
29d096c8 | 1584 | |
8390dac0 AW |
1585 | ;; Aborts the program when a formatting error occures. This is a null |
1586 | ;; argument closure to jump to the interpreters toplevel continuation. | |
29d096c8 | 1587 | |
8390dac0 | 1588 | (define (format:abort) (error "error in format")) |
093d2ca9 | 1589 | |
8390dac0 AW |
1590 | (let ((arg-pos (format:format-work format-string format-args)) |
1591 | (arg-len (length format-args))) | |
1592 | (cond | |
1593 | ((> arg-pos arg-len) | |
1594 | (set! format:arg-pos (+ arg-len 1)) | |
1595 | (display format:arg-pos) | |
1596 | (format:error "~a missing argument~:p" (- arg-pos arg-len))) | |
1597 | (else | |
b90b4b2b | 1598 | (if flush-output? |
79f124ac | 1599 | (force-output port)) |
8390dac0 AW |
1600 | (if destination |
1601 | #t | |
79f124ac AW |
1602 | (let ((str (get-output-string port))) |
1603 | (close-port port) | |
8390dac0 | 1604 | str))))))) |
2ce77e6c AW |
1605 | |
1606 | (begin-deprecated | |
1607 | (set! format | |
1608 | (let ((format format)) | |
1609 | (case-lambda | |
f02f8a61 AW |
1610 | ((destination format-string . args) |
1611 | (if (string? destination) | |
2ce77e6c AW |
1612 | (begin |
1613 | (issue-deprecation-warning | |
f02f8a61 AW |
1614 | "Omitting the destination on a call to format is deprecated." |
1615 | "Pass #f as the destination, before the format string.") | |
1616 | (apply format #f destination format-string args)) | |
1617 | (apply format destination format-string args))) | |
2ce77e6c AW |
1618 | ((deprecated-format-string-only) |
1619 | (issue-deprecation-warning | |
1620 | "Omitting the destination port on a call to format is deprecated." | |
1621 | "Pass #f as the destination port, before the format string.") | |
1622 | (format #f deprecated-format-string-only)))))) | |
29d096c8 | 1623 | |
d02655f7 | 1624 | |
14469b7c | 1625 | ;; Thanks to Shuji Narazaki |
296ff5e7 | 1626 | (module-set! the-root-module 'format format) |