| 1 | /* Copyright (C) 1995,1996 Free Software Foundation, Inc. |
| 2 | * |
| 3 | * This program is free software; you can redistribute it and/or modify |
| 4 | * it under the terms of the GNU General Public License as published by |
| 5 | * the Free Software Foundation; either version 2, or (at your option) |
| 6 | * any later version. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | * GNU General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License |
| 14 | * along with this software; see the file COPYING. If not, write to |
| 15 | * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
| 16 | * |
| 17 | * As a special exception, the Free Software Foundation gives permission |
| 18 | * for additional uses of the text contained in its release of GUILE. |
| 19 | * |
| 20 | * The exception is that, if you link the GUILE library with other files |
| 21 | * to produce an executable, this does not by itself cause the |
| 22 | * resulting executable to be covered by the GNU General Public License. |
| 23 | * Your use of that executable is in no way restricted on account of |
| 24 | * linking the GUILE library code into it. |
| 25 | * |
| 26 | * This exception does not however invalidate any other reasons why |
| 27 | * the executable file might be covered by the GNU General Public License. |
| 28 | * |
| 29 | * This exception applies only to the code released by the |
| 30 | * Free Software Foundation under the name GUILE. If you copy |
| 31 | * code from other Free Software Foundation releases into a copy of |
| 32 | * GUILE, as the General Public License permits, the exception does |
| 33 | * not apply to the code that you add in this way. To avoid misleading |
| 34 | * anyone as to the status of such modified files, you must delete |
| 35 | * this exception notice from them. |
| 36 | * |
| 37 | * If you write modifications of your own for GUILE, it is your choice |
| 38 | * whether to permit this exception to apply to your modifications. |
| 39 | * If you do not wish that, delete this exception notice. |
| 40 | */ |
| 41 | \f |
| 42 | |
| 43 | #include <stdio.h> |
| 44 | #include "_scm.h" |
| 45 | #include "chars.h" |
| 46 | #include "genio.h" |
| 47 | #include "mbstrings.h" |
| 48 | #include "smob.h" |
| 49 | #include "eval.h" |
| 50 | #include "procprop.h" |
| 51 | #include "read.h" |
| 52 | #include "weaks.h" |
| 53 | #include "unif.h" |
| 54 | #include "alist.h" |
| 55 | #include "struct.h" |
| 56 | |
| 57 | #include "print.h" |
| 58 | \f |
| 59 | |
| 60 | /* {Names of immediate symbols} |
| 61 | * |
| 62 | * This table must agree with the declarations in scm.h: {Immediate Symbols}. |
| 63 | */ |
| 64 | |
| 65 | char *scm_isymnames[] = |
| 66 | { |
| 67 | /* This table must agree with the declarations */ |
| 68 | "#@and", |
| 69 | "#@begin", |
| 70 | "#@case", |
| 71 | "#@cond", |
| 72 | "#@do", |
| 73 | "#@if", |
| 74 | "#@lambda", |
| 75 | "#@let", |
| 76 | "#@let*", |
| 77 | "#@letrec", |
| 78 | "#@or", |
| 79 | "#@quote", |
| 80 | "#@set!", |
| 81 | "#@define", |
| 82 | #if 0 |
| 83 | "#@literal-variable-ref", |
| 84 | "#@literal-variable-set!", |
| 85 | #endif |
| 86 | "#@apply", |
| 87 | "#@call-with-current-continuation", |
| 88 | |
| 89 | /* user visible ISYMS */ |
| 90 | /* other keywords */ |
| 91 | /* Flags */ |
| 92 | |
| 93 | "#f", |
| 94 | "#t", |
| 95 | "#<undefined>", |
| 96 | "#<eof>", |
| 97 | "()", |
| 98 | "#<unspecified>" |
| 99 | }; |
| 100 | |
| 101 | scm_option scm_print_opts[] = { |
| 102 | { SCM_OPTION_SCM, "closure-hook", SCM_BOOL_F, |
| 103 | "Hook for printing closures." }, |
| 104 | { SCM_OPTION_BOOLEAN, "source", 0, |
| 105 | "Print closures with source." } |
| 106 | }; |
| 107 | |
| 108 | SCM_PROC (s_print_options, "print-options-interface", 0, 1, 0, scm_print_options); |
| 109 | |
| 110 | SCM |
| 111 | scm_print_options (setting) |
| 112 | SCM setting; |
| 113 | { |
| 114 | SCM ans = scm_options (setting, |
| 115 | scm_print_opts, |
| 116 | SCM_N_PRINT_OPTIONS, |
| 117 | s_print_options); |
| 118 | return ans; |
| 119 | } |
| 120 | |
| 121 | \f |
| 122 | /* {Printing of Scheme Objects} |
| 123 | */ |
| 124 | |
| 125 | /* Detection of circular references. |
| 126 | * |
| 127 | * Due to other constraints in the implementation, this code has bad |
| 128 | * time complexity (O (depth * N)), The printer code will be |
| 129 | * completely rewritten before next release of Guile. The new code |
| 130 | * will be O(N). |
| 131 | */ |
| 132 | #define PUSH_REF(pstate, obj) \ |
| 133 | { \ |
| 134 | pstate->ref_stack[pstate->top++] = (obj); \ |
| 135 | if (pstate->top == pstate->ceiling) \ |
| 136 | grow_ref_stack (pstate); \ |
| 137 | } |
| 138 | |
| 139 | #define ENTER_NESTED_DATA(pstate, obj, label) \ |
| 140 | { \ |
| 141 | register int i; \ |
| 142 | for (i = 0; i < pstate->top; ++i) \ |
| 143 | if (pstate->ref_stack[i] == (obj)) \ |
| 144 | goto label; \ |
| 145 | if (pstate->fancyp) \ |
| 146 | { \ |
| 147 | if (pstate->top - pstate->list_offset >= pstate->level) \ |
| 148 | { \ |
| 149 | scm_gen_putc ('#', port); \ |
| 150 | return; \ |
| 151 | } \ |
| 152 | } \ |
| 153 | PUSH_REF(pstate, obj); \ |
| 154 | } \ |
| 155 | |
| 156 | #define EXIT_NESTED_DATA(pstate) { --pstate->top; } |
| 157 | |
| 158 | static SCM print_state_pool; |
| 159 | |
| 160 | #if 1 /* Used for debugging purposes */ |
| 161 | SCM_PROC(s_current_pstate, "current-pstate", 0, 0, 0, scm_current_pstate); |
| 162 | |
| 163 | SCM |
| 164 | scm_current_pstate () |
| 165 | { |
| 166 | return SCM_CADR (print_state_pool); |
| 167 | } |
| 168 | #endif |
| 169 | |
| 170 | #define PSTATE_SIZE 50L |
| 171 | |
| 172 | static SCM make_print_state SCM_P ((void)); |
| 173 | |
| 174 | static SCM |
| 175 | make_print_state () |
| 176 | { |
| 177 | SCM print_state = scm_make_struct (SCM_CAR (print_state_pool), /* pstate type */ |
| 178 | SCM_INUM0, |
| 179 | SCM_EOL); |
| 180 | scm_print_state *pstate = SCM_PRINT_STATE (print_state); |
| 181 | pstate->ref_vect = scm_make_vector (SCM_MAKINUM (PSTATE_SIZE), |
| 182 | SCM_UNDEFINED, |
| 183 | SCM_UNDEFINED); |
| 184 | pstate->ref_stack = SCM_VELTS (pstate->ref_vect); |
| 185 | pstate->ceiling = SCM_LENGTH (pstate->ref_vect); |
| 186 | return print_state; |
| 187 | } |
| 188 | |
| 189 | SCM |
| 190 | scm_make_print_state () |
| 191 | { |
| 192 | SCM answer = 0; |
| 193 | |
| 194 | /* First try to allocate a print state from the pool */ |
| 195 | SCM_DEFER_INTS; |
| 196 | if (SCM_NNULLP (SCM_CDR (print_state_pool))) |
| 197 | { |
| 198 | answer = SCM_CADR (print_state_pool); |
| 199 | SCM_SETCDR (print_state_pool, SCM_CDDR (print_state_pool)); |
| 200 | } |
| 201 | SCM_ALLOW_INTS; |
| 202 | |
| 203 | return answer ? answer : make_print_state (); |
| 204 | } |
| 205 | |
| 206 | void |
| 207 | scm_free_print_state (print_state) |
| 208 | SCM print_state; |
| 209 | { |
| 210 | SCM handle; |
| 211 | scm_print_state *pstate = SCM_PRINT_STATE (print_state); |
| 212 | /* Cleanup before returning print state to pool. |
| 213 | * It is better to do it here. Doing it in scm_prin1 |
| 214 | * would cost more since that function is called much more |
| 215 | * often. |
| 216 | */ |
| 217 | pstate->fancyp = 0; |
| 218 | SCM_NEWCELL (handle); |
| 219 | SCM_DEFER_INTS; |
| 220 | SCM_SETCAR (handle, print_state); |
| 221 | SCM_SETCDR (handle, SCM_CDR (print_state_pool)); |
| 222 | SCM_SETCDR (print_state_pool, handle); |
| 223 | SCM_ALLOW_INTS; |
| 224 | } |
| 225 | |
| 226 | static void grow_ref_stack SCM_P ((scm_print_state *pstate)); |
| 227 | |
| 228 | static void |
| 229 | grow_ref_stack (pstate) |
| 230 | scm_print_state *pstate; |
| 231 | { |
| 232 | int new_size = 2 * pstate->ceiling; |
| 233 | scm_vector_set_length_x (pstate->ref_vect, SCM_MAKINUM (new_size)); |
| 234 | pstate->ref_stack = SCM_VELTS (pstate->ref_vect); |
| 235 | pstate->ceiling = new_size; |
| 236 | } |
| 237 | |
| 238 | |
| 239 | static void print_circref SCM_P ((SCM port, scm_print_state *pstate, SCM ref)); |
| 240 | |
| 241 | static void |
| 242 | print_circref (port, pstate, ref) |
| 243 | SCM port; |
| 244 | scm_print_state *pstate; |
| 245 | SCM ref; |
| 246 | { |
| 247 | register int i; |
| 248 | int self = pstate->top - 1; |
| 249 | i = pstate->top - 1; |
| 250 | if (SCM_CONSP (pstate->ref_stack[i])) |
| 251 | { |
| 252 | while (i > 0) |
| 253 | { |
| 254 | if (SCM_NCONSP (pstate->ref_stack[i - 1]) |
| 255 | || SCM_CDR (pstate->ref_stack[i - 1]) != pstate->ref_stack[i]) |
| 256 | break; |
| 257 | --i; |
| 258 | } |
| 259 | self = i; |
| 260 | } |
| 261 | for (i = pstate->top - 1; 1; --i) |
| 262 | if (pstate->ref_stack[i] == ref) |
| 263 | break; |
| 264 | scm_gen_putc ('#', port); |
| 265 | scm_intprint (i - self, 10, port); |
| 266 | scm_gen_putc ('#', port); |
| 267 | } |
| 268 | |
| 269 | /* Print generally. Handles both write and display according to PSTATE. |
| 270 | */ |
| 271 | |
| 272 | |
| 273 | void |
| 274 | scm_iprin1 (exp, port, pstate) |
| 275 | SCM exp; |
| 276 | SCM port; |
| 277 | scm_print_state *pstate; |
| 278 | { |
| 279 | register long i; |
| 280 | taloop: |
| 281 | switch (7 & (int) exp) |
| 282 | { |
| 283 | case 2: |
| 284 | case 6: |
| 285 | scm_intprint (SCM_INUM (exp), 10, port); |
| 286 | break; |
| 287 | case 4: |
| 288 | if (SCM_ICHRP (exp)) |
| 289 | { |
| 290 | i = SCM_ICHR (exp); |
| 291 | scm_put_wchar (i, port, SCM_WRITINGP (pstate)); |
| 292 | |
| 293 | } |
| 294 | else if (SCM_IFLAGP (exp) |
| 295 | && (SCM_ISYMNUM (exp) < (sizeof scm_isymnames / sizeof (char *)))) |
| 296 | scm_gen_puts (scm_regular_string, SCM_ISYMCHARS (exp), port); |
| 297 | else if (SCM_ILOCP (exp)) |
| 298 | { |
| 299 | scm_gen_puts (scm_regular_string, "#@", port); |
| 300 | scm_intprint ((long) SCM_IFRAME (exp), 10, port); |
| 301 | scm_gen_putc (SCM_ICDRP (exp) ? '-' : '+', port); |
| 302 | scm_intprint ((long) SCM_IDIST (exp), 10, port); |
| 303 | } |
| 304 | else |
| 305 | goto idef; |
| 306 | break; |
| 307 | case 1: |
| 308 | /* gloc */ |
| 309 | scm_gen_puts (scm_regular_string, "#@", port); |
| 310 | exp = SCM_CAR (exp - 1); |
| 311 | goto taloop; |
| 312 | default: |
| 313 | idef: |
| 314 | scm_ipruk ("immediate", exp, port); |
| 315 | break; |
| 316 | case 0: |
| 317 | switch (SCM_TYP7 (exp)) |
| 318 | { |
| 319 | case scm_tcs_cons_gloc: |
| 320 | |
| 321 | if (SCM_CDR (SCM_CAR (exp) - 1L) == 0) |
| 322 | { |
| 323 | scm_gen_write (scm_regular_string, "#<struct ", sizeof ("#<struct ") - 1, port); |
| 324 | scm_intprint(exp, 16, port); |
| 325 | scm_gen_putc ('>', port); |
| 326 | break; |
| 327 | } |
| 328 | |
| 329 | case scm_tcs_cons_imcar: |
| 330 | case scm_tcs_cons_nimcar: |
| 331 | ENTER_NESTED_DATA (pstate, exp, circref); |
| 332 | scm_iprlist ("(", exp, ')', port, pstate); |
| 333 | EXIT_NESTED_DATA (pstate); |
| 334 | break; |
| 335 | circref: |
| 336 | print_circref (port, pstate, exp); |
| 337 | break; |
| 338 | case scm_tcs_closures: |
| 339 | if (SCM_NFALSEP (scm_procedure_p (SCM_PRINT_CLOSURE))) |
| 340 | { |
| 341 | SCM ans = scm_cons2 (exp, port, |
| 342 | scm_cons (SCM_WRITINGP (pstate) |
| 343 | ? SCM_BOOL_T |
| 344 | : SCM_BOOL_F, |
| 345 | SCM_EOL)); |
| 346 | ans = scm_apply (SCM_PRINT_CLOSURE, ans, SCM_EOL); |
| 347 | } |
| 348 | else |
| 349 | { |
| 350 | SCM name, code; |
| 351 | name = scm_procedure_property (exp, scm_i_name); |
| 352 | code = SCM_CODE (exp); |
| 353 | scm_gen_puts (scm_regular_string, "#<procedure ", port); |
| 354 | if (SCM_NIMP (name) && SCM_ROSTRINGP (name)) |
| 355 | { |
| 356 | scm_gen_puts (scm_regular_string, SCM_ROCHARS (name), port); |
| 357 | scm_gen_putc (' ', port); |
| 358 | } |
| 359 | scm_iprin1 (SCM_CAR (code), port, pstate); |
| 360 | if (SCM_PRINT_SOURCE_P) |
| 361 | { |
| 362 | code = scm_unmemocopy (SCM_CDR (code), |
| 363 | SCM_EXTEND_ENV (SCM_CAR (code), |
| 364 | SCM_EOL, |
| 365 | SCM_ENV (exp))); |
| 366 | ENTER_NESTED_DATA (pstate, exp, circref); |
| 367 | scm_iprlist (" ", code, '>', port, pstate); |
| 368 | EXIT_NESTED_DATA (pstate); |
| 369 | } |
| 370 | else |
| 371 | scm_gen_putc ('>', port); |
| 372 | } |
| 373 | break; |
| 374 | case scm_tc7_mb_string: |
| 375 | case scm_tc7_mb_substring: |
| 376 | scm_print_mb_string (exp, port, SCM_WRITINGP (pstate)); |
| 377 | break; |
| 378 | case scm_tc7_substring: |
| 379 | case scm_tc7_string: |
| 380 | if (SCM_WRITINGP (pstate)) |
| 381 | { |
| 382 | scm_gen_putc ('"', port); |
| 383 | for (i = 0; i < SCM_ROLENGTH (exp); ++i) |
| 384 | switch (SCM_ROCHARS (exp)[i]) |
| 385 | { |
| 386 | case '"': |
| 387 | case '\\': |
| 388 | scm_gen_putc ('\\', port); |
| 389 | default: |
| 390 | scm_gen_putc (SCM_ROCHARS (exp)[i], port); |
| 391 | } |
| 392 | scm_gen_putc ('"', port); |
| 393 | break; |
| 394 | } |
| 395 | else |
| 396 | scm_gen_write (scm_regular_string, SCM_ROCHARS (exp), |
| 397 | (scm_sizet) SCM_ROLENGTH (exp), |
| 398 | port); |
| 399 | break; |
| 400 | case scm_tcs_symbols: |
| 401 | if (SCM_MB_STRINGP (exp)) |
| 402 | { |
| 403 | scm_print_mb_symbol (exp, port); |
| 404 | break; |
| 405 | } |
| 406 | else |
| 407 | { |
| 408 | int pos; |
| 409 | int end; |
| 410 | int len; |
| 411 | char * str; |
| 412 | int weird; |
| 413 | int maybe_weird; |
| 414 | int mw_pos = 0; |
| 415 | |
| 416 | len = SCM_LENGTH (exp); |
| 417 | str = SCM_CHARS (exp); |
| 418 | scm_remember (&exp); |
| 419 | pos = 0; |
| 420 | weird = 0; |
| 421 | maybe_weird = 0; |
| 422 | |
| 423 | if (len == 0) |
| 424 | scm_gen_write (scm_regular_string, "#{}#", 4, port); |
| 425 | |
| 426 | for (end = pos; end < len; ++end) |
| 427 | switch (str[end]) |
| 428 | { |
| 429 | #ifdef BRACKETS_AS_PARENS |
| 430 | case '[': |
| 431 | case ']': |
| 432 | #endif |
| 433 | case '(': |
| 434 | case ')': |
| 435 | case '"': |
| 436 | case ';': |
| 437 | case SCM_WHITE_SPACES: |
| 438 | case SCM_LINE_INCREMENTORS: |
| 439 | weird_handler: |
| 440 | if (maybe_weird) |
| 441 | { |
| 442 | end = mw_pos; |
| 443 | maybe_weird = 0; |
| 444 | } |
| 445 | if (!weird) |
| 446 | { |
| 447 | scm_gen_write (scm_regular_string, "#{", 2, port); |
| 448 | weird = 1; |
| 449 | } |
| 450 | if (pos < end) |
| 451 | { |
| 452 | scm_gen_write (scm_regular_string, str + pos, end - pos, port); |
| 453 | } |
| 454 | { |
| 455 | char buf[2]; |
| 456 | buf[0] = '\\'; |
| 457 | buf[1] = str[end]; |
| 458 | scm_gen_write (scm_regular_string, buf, 2, port); |
| 459 | } |
| 460 | pos = end + 1; |
| 461 | break; |
| 462 | case '\\': |
| 463 | if (weird) |
| 464 | goto weird_handler; |
| 465 | if (!maybe_weird) |
| 466 | { |
| 467 | maybe_weird = 1; |
| 468 | mw_pos = pos; |
| 469 | } |
| 470 | break; |
| 471 | case '}': |
| 472 | case '#': |
| 473 | if (weird) |
| 474 | goto weird_handler; |
| 475 | break; |
| 476 | default: |
| 477 | break; |
| 478 | } |
| 479 | if (pos < end) |
| 480 | scm_gen_write (scm_regular_string, str + pos, end - pos, port); |
| 481 | if (weird) |
| 482 | scm_gen_write (scm_regular_string, "}#", 2, port); |
| 483 | break; |
| 484 | } |
| 485 | case scm_tc7_wvect: |
| 486 | ENTER_NESTED_DATA (pstate, exp, circref); |
| 487 | if (SCM_IS_WHVEC (exp)) |
| 488 | scm_gen_puts (scm_regular_string, "#wh(", port); |
| 489 | else |
| 490 | scm_gen_puts (scm_regular_string, "#w(", port); |
| 491 | goto common_vector_printer; |
| 492 | |
| 493 | case scm_tc7_vector: |
| 494 | ENTER_NESTED_DATA (pstate, exp, circref); |
| 495 | scm_gen_puts (scm_regular_string, "#(", port); |
| 496 | common_vector_printer: |
| 497 | for (i = 0; i + 1 < SCM_LENGTH (exp); ++i) |
| 498 | { |
| 499 | /* CHECK_INTS; */ |
| 500 | scm_iprin1 (SCM_VELTS (exp)[i], port, pstate); |
| 501 | scm_gen_putc (' ', port); |
| 502 | } |
| 503 | if (i < SCM_LENGTH (exp)) |
| 504 | { |
| 505 | /* CHECK_INTS; */ |
| 506 | scm_iprin1 (SCM_VELTS (exp)[i], port, pstate); |
| 507 | } |
| 508 | scm_gen_putc (')', port); |
| 509 | EXIT_NESTED_DATA (pstate); |
| 510 | break; |
| 511 | case scm_tc7_bvect: |
| 512 | case scm_tc7_byvect: |
| 513 | case scm_tc7_svect: |
| 514 | case scm_tc7_ivect: |
| 515 | case scm_tc7_uvect: |
| 516 | case scm_tc7_fvect: |
| 517 | case scm_tc7_dvect: |
| 518 | case scm_tc7_cvect: |
| 519 | #ifdef LONGLONGS |
| 520 | case scm_tc7_llvect: |
| 521 | #endif |
| 522 | scm_raprin1 (exp, port, pstate); |
| 523 | break; |
| 524 | case scm_tcs_subrs: |
| 525 | scm_gen_puts (scm_regular_string, "#<primitive-procedure ", port); |
| 526 | scm_gen_puts ((SCM_MB_STRINGP (SCM_SNAME(exp)) |
| 527 | ? scm_mb_string |
| 528 | : scm_regular_string), |
| 529 | SCM_CHARS (SCM_SNAME (exp)), port); |
| 530 | scm_gen_putc ('>', port); |
| 531 | break; |
| 532 | #ifdef CCLO |
| 533 | case scm_tc7_cclo: |
| 534 | scm_gen_puts (scm_regular_string, "#<compiled-closure ", port); |
| 535 | scm_iprin1 (SCM_CCLO_SUBR (exp), port, pstate); |
| 536 | scm_gen_putc ('>', port); |
| 537 | break; |
| 538 | #endif |
| 539 | case scm_tc7_contin: |
| 540 | scm_gen_puts (scm_regular_string, "#<continuation ", port); |
| 541 | scm_intprint (SCM_LENGTH (exp), 10, port); |
| 542 | scm_gen_puts (scm_regular_string, " @ ", port); |
| 543 | scm_intprint ((long) SCM_CHARS (exp), 16, port); |
| 544 | scm_gen_putc ('>', port); |
| 545 | break; |
| 546 | case scm_tc7_port: |
| 547 | i = SCM_PTOBNUM (exp); |
| 548 | if (i < scm_numptob |
| 549 | && scm_ptobs[i].print |
| 550 | && (scm_ptobs[i].print) (exp, port, pstate)) |
| 551 | break; |
| 552 | goto punk; |
| 553 | case scm_tc7_smob: |
| 554 | ENTER_NESTED_DATA (pstate, exp, circref); |
| 555 | i = SCM_SMOBNUM (exp); |
| 556 | if (i < scm_numsmob && scm_smobs[i].print |
| 557 | && (scm_smobs[i].print) (exp, port, pstate)) |
| 558 | { |
| 559 | EXIT_NESTED_DATA (pstate); |
| 560 | break; |
| 561 | } |
| 562 | EXIT_NESTED_DATA (pstate); |
| 563 | default: |
| 564 | punk: |
| 565 | scm_ipruk ("type", exp, port); |
| 566 | } |
| 567 | } |
| 568 | } |
| 569 | |
| 570 | /* Print states are necessary for circular reference safe printing. |
| 571 | * They are also expensive to allocate. Therefore print states are |
| 572 | * kept in a pool so that they can be reused. |
| 573 | */ |
| 574 | |
| 575 | void |
| 576 | scm_prin1 (exp, port, writingp) |
| 577 | SCM exp; |
| 578 | SCM port; |
| 579 | int writingp; |
| 580 | { |
| 581 | SCM handle = 0; /* Will GC protect the handle whilst unlinked */ |
| 582 | scm_print_state *pstate; |
| 583 | |
| 584 | /* First try to allocate a print state from the pool */ |
| 585 | SCM_DEFER_INTS; |
| 586 | if (SCM_NNULLP (SCM_CDR (print_state_pool))) |
| 587 | { |
| 588 | handle = SCM_CDR (print_state_pool); |
| 589 | SCM_SETCDR (print_state_pool, SCM_CDDR (print_state_pool)); |
| 590 | } |
| 591 | SCM_ALLOW_INTS; |
| 592 | |
| 593 | if (!handle) |
| 594 | handle = scm_cons (make_print_state (), SCM_EOL); |
| 595 | |
| 596 | pstate = SCM_PRINT_STATE (SCM_CAR (handle)); |
| 597 | pstate->writingp = writingp; |
| 598 | scm_iprin1 (exp, port, pstate); |
| 599 | |
| 600 | /* Return print state to pool */ |
| 601 | SCM_DEFER_INTS; |
| 602 | SCM_SETCDR (handle, SCM_CDR (print_state_pool)); |
| 603 | SCM_SETCDR (print_state_pool, handle); |
| 604 | SCM_ALLOW_INTS; |
| 605 | } |
| 606 | |
| 607 | |
| 608 | /* Print an integer. |
| 609 | */ |
| 610 | |
| 611 | void |
| 612 | scm_intprint (n, radix, port) |
| 613 | long n; |
| 614 | int radix; |
| 615 | SCM port; |
| 616 | { |
| 617 | char num_buf[SCM_INTBUFLEN]; |
| 618 | scm_gen_write (scm_regular_string, num_buf, scm_iint2str (n, radix, num_buf), port); |
| 619 | } |
| 620 | |
| 621 | /* Print an object of unrecognized type. |
| 622 | */ |
| 623 | |
| 624 | void |
| 625 | scm_ipruk (hdr, ptr, port) |
| 626 | char *hdr; |
| 627 | SCM ptr; |
| 628 | SCM port; |
| 629 | { |
| 630 | scm_gen_puts (scm_regular_string, "#<unknown-", port); |
| 631 | scm_gen_puts (scm_regular_string, hdr, port); |
| 632 | if (SCM_CELLP (ptr)) |
| 633 | { |
| 634 | scm_gen_puts (scm_regular_string, " (0x", port); |
| 635 | scm_intprint (SCM_CAR (ptr), 16, port); |
| 636 | scm_gen_puts (scm_regular_string, " . 0x", port); |
| 637 | scm_intprint (SCM_CDR (ptr), 16, port); |
| 638 | scm_gen_puts (scm_regular_string, ") @", port); |
| 639 | } |
| 640 | scm_gen_puts (scm_regular_string, " 0x", port); |
| 641 | scm_intprint (ptr, 16, port); |
| 642 | scm_gen_putc ('>', port); |
| 643 | } |
| 644 | |
| 645 | /* Print a list. |
| 646 | */ |
| 647 | |
| 648 | |
| 649 | void |
| 650 | scm_iprlist (hdr, exp, tlr, port, pstate) |
| 651 | char *hdr; |
| 652 | SCM exp; |
| 653 | char tlr; |
| 654 | SCM port; |
| 655 | scm_print_state *pstate; |
| 656 | { |
| 657 | register int i; |
| 658 | register SCM hare, tortoise; |
| 659 | int floor = pstate->top - 2; |
| 660 | scm_gen_puts (scm_regular_string, hdr, port); |
| 661 | /* CHECK_INTS; */ |
| 662 | if (pstate->fancyp) |
| 663 | goto fancy_printing; |
| 664 | |
| 665 | /* Run a hare and tortoise so that total time complexity will be |
| 666 | O(depth * N) instead of O(N^2). */ |
| 667 | hare = SCM_CDR (exp); |
| 668 | tortoise = exp; |
| 669 | while (SCM_NIMP (hare) && SCM_ECONSP (hare)) |
| 670 | { |
| 671 | if (hare == tortoise) |
| 672 | goto fancy_printing; |
| 673 | hare = SCM_CDR (hare); |
| 674 | if (SCM_IMP (hare) || SCM_NECONSP (hare)) |
| 675 | break; |
| 676 | hare = SCM_CDR (hare); |
| 677 | tortoise = SCM_CDR (tortoise); |
| 678 | } |
| 679 | |
| 680 | /* No cdr cycles intrinsic to this list */ |
| 681 | scm_iprin1 (SCM_CAR (exp), port, pstate); |
| 682 | exp = SCM_CDR (exp); |
| 683 | for (; SCM_NIMP (exp); exp = SCM_CDR (exp)) |
| 684 | { |
| 685 | if (SCM_NECONSP (exp)) |
| 686 | break; |
| 687 | for (i = floor; i >= 0; --i) |
| 688 | if (pstate->ref_stack[i] == exp) |
| 689 | goto circref; |
| 690 | PUSH_REF (pstate, exp); |
| 691 | scm_gen_putc (' ', port); |
| 692 | /* CHECK_INTS; */ |
| 693 | scm_iprin1 (SCM_CAR (exp), port, pstate); |
| 694 | } |
| 695 | if (SCM_NNULLP (exp)) |
| 696 | { |
| 697 | scm_gen_puts (scm_regular_string, " . ", port); |
| 698 | scm_iprin1 (exp, port, pstate); |
| 699 | } |
| 700 | |
| 701 | end: |
| 702 | scm_gen_putc (tlr, port); |
| 703 | pstate->top = floor + 2; |
| 704 | return; |
| 705 | |
| 706 | fancy_printing: |
| 707 | { |
| 708 | int n = pstate->length; |
| 709 | |
| 710 | scm_iprin1 (SCM_CAR (exp), port, pstate); |
| 711 | exp = SCM_CDR (exp); --n; |
| 712 | for (; SCM_NIMP (exp); exp = SCM_CDR (exp)) |
| 713 | { |
| 714 | if (SCM_NECONSP (exp)) |
| 715 | break; |
| 716 | for (i = 0; i < pstate->top; ++i) |
| 717 | if (pstate->ref_stack[i] == exp) |
| 718 | goto fancy_circref; |
| 719 | if (pstate->fancyp) |
| 720 | { |
| 721 | if (n == 0) |
| 722 | { |
| 723 | scm_gen_puts (scm_regular_string, " ...", port); |
| 724 | goto skip_tail; |
| 725 | } |
| 726 | else |
| 727 | --n; |
| 728 | } |
| 729 | PUSH_REF(pstate, exp); |
| 730 | ++pstate->list_offset; |
| 731 | scm_gen_putc (' ', port); |
| 732 | /* CHECK_INTS; */ |
| 733 | scm_iprin1 (SCM_CAR (exp), port, pstate); |
| 734 | } |
| 735 | } |
| 736 | if (SCM_NNULLP (exp)) |
| 737 | { |
| 738 | scm_gen_puts (scm_regular_string, " . ", port); |
| 739 | scm_iprin1 (exp, port, pstate); |
| 740 | } |
| 741 | skip_tail: |
| 742 | pstate->list_offset -= pstate->top - floor - 2; |
| 743 | goto end; |
| 744 | |
| 745 | fancy_circref: |
| 746 | pstate->list_offset -= pstate->top - floor - 2; |
| 747 | |
| 748 | circref: |
| 749 | scm_gen_puts (scm_regular_string, " . ", port); |
| 750 | print_circref (port, pstate, exp); |
| 751 | goto end; |
| 752 | } |
| 753 | |
| 754 | \f |
| 755 | |
| 756 | SCM_PROC(s_write, "write", 1, 1, 0, scm_write); |
| 757 | |
| 758 | SCM |
| 759 | scm_write (obj, port) |
| 760 | SCM obj; |
| 761 | SCM port; |
| 762 | { |
| 763 | if (SCM_UNBNDP (port)) |
| 764 | port = scm_cur_outp; |
| 765 | else |
| 766 | SCM_ASSERT (SCM_NIMP (port) && SCM_OPOUTPORTP (port), port, SCM_ARG2, s_write); |
| 767 | scm_prin1 (obj, port, 1); |
| 768 | #ifdef HAVE_PIPE |
| 769 | # ifdef EPIPE |
| 770 | if (EPIPE == errno) |
| 771 | scm_close_port (port); |
| 772 | # endif |
| 773 | #endif |
| 774 | return SCM_UNSPECIFIED; |
| 775 | } |
| 776 | |
| 777 | |
| 778 | SCM_PROC(s_display, "display", 1, 1, 0, scm_display); |
| 779 | |
| 780 | SCM |
| 781 | scm_display (obj, port) |
| 782 | SCM obj; |
| 783 | SCM port; |
| 784 | { |
| 785 | if (SCM_UNBNDP (port)) |
| 786 | port = scm_cur_outp; |
| 787 | else |
| 788 | SCM_ASSERT (SCM_NIMP (port) && SCM_OPOUTPORTP (port), port, SCM_ARG2, s_display); |
| 789 | scm_prin1 (obj, port, 0); |
| 790 | #ifdef HAVE_PIPE |
| 791 | # ifdef EPIPE |
| 792 | if (EPIPE == errno) |
| 793 | scm_close_port (port); |
| 794 | # endif |
| 795 | #endif |
| 796 | return SCM_UNSPECIFIED; |
| 797 | } |
| 798 | |
| 799 | SCM_PROC(s_newline, "newline", 0, 1, 0, scm_newline); |
| 800 | |
| 801 | SCM |
| 802 | scm_newline (port) |
| 803 | SCM port; |
| 804 | { |
| 805 | if (SCM_UNBNDP (port)) |
| 806 | port = scm_cur_outp; |
| 807 | else |
| 808 | SCM_ASSERT (SCM_NIMP (port) && SCM_OPOUTPORTP (port), port, SCM_ARG1, s_newline); |
| 809 | scm_gen_putc ('\n', port); |
| 810 | #ifdef HAVE_PIPE |
| 811 | # ifdef EPIPE |
| 812 | if (EPIPE == errno) |
| 813 | scm_close_port (port); |
| 814 | else |
| 815 | # endif |
| 816 | #endif |
| 817 | if (port == scm_cur_outp) |
| 818 | scm_fflush (port); |
| 819 | return SCM_UNSPECIFIED; |
| 820 | } |
| 821 | |
| 822 | SCM_PROC(s_write_char, "write-char", 1, 1, 0, scm_write_char); |
| 823 | |
| 824 | SCM |
| 825 | scm_write_char (chr, port) |
| 826 | SCM chr; |
| 827 | SCM port; |
| 828 | { |
| 829 | if (SCM_UNBNDP (port)) |
| 830 | port = scm_cur_outp; |
| 831 | else |
| 832 | SCM_ASSERT (SCM_NIMP (port) && SCM_OPOUTPORTP (port), port, SCM_ARG2, s_write_char); |
| 833 | SCM_ASSERT (SCM_ICHRP (chr), chr, SCM_ARG1, s_write_char); |
| 834 | scm_gen_putc ((int) SCM_ICHR (chr), port); |
| 835 | #ifdef HAVE_PIPE |
| 836 | # ifdef EPIPE |
| 837 | if (EPIPE == errno) |
| 838 | scm_close_port (port); |
| 839 | # endif |
| 840 | #endif |
| 841 | return SCM_UNSPECIFIED; |
| 842 | } |
| 843 | |
| 844 | |
| 845 | \f |
| 846 | |
| 847 | |
| 848 | void |
| 849 | scm_init_print () |
| 850 | { |
| 851 | SCM vtable, type; |
| 852 | scm_init_opts (scm_print_options, scm_print_opts, SCM_N_PRINT_OPTIONS); |
| 853 | vtable = scm_make_vtable_vtable (scm_make_struct_layout (scm_nullstr), SCM_INUM0, SCM_EOL); |
| 854 | type = scm_make_struct (vtable, |
| 855 | SCM_INUM0, |
| 856 | scm_cons (scm_make_struct_layout (scm_makfrom0str (SCM_PRINT_STATE_LAYOUT)), |
| 857 | SCM_EOL)); |
| 858 | print_state_pool = scm_permanent_object (scm_cons (type, SCM_EOL)); |
| 859 | #include "print.x" |
| 860 | } |