1 /* Copyright (C) 1995-1999,2000,2001 Free Software Foundation, Inc.
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)
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.
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, Inc., 59 Temple Place, Suite 330,
16 * Boston, MA 02111-1307 USA
18 * As a special exception, the Free Software Foundation gives permission
19 * for additional uses of the text contained in its release of GUILE.
21 * The exception is that, if you link the GUILE library with other files
22 * to produce an executable, this does not by itself cause the
23 * resulting executable to be covered by the GNU General Public License.
24 * Your use of that executable is in no way restricted on account of
25 * linking the GUILE library code into it.
27 * This exception does not however invalidate any other reasons why
28 * the executable file might be covered by the GNU General Public License.
30 * This exception applies only to the code released by the
31 * Free Software Foundation under the name GUILE. If you copy
32 * code from other Free Software Foundation releases into a copy of
33 * GUILE, as the General Public License permits, the exception does
34 * not apply to the code that you add in this way. To avoid misleading
35 * anyone as to the status of such modified files, you must delete
36 * this exception notice from them.
38 * If you write modifications of your own for GUILE, it is your choice
39 * whether to permit this exception to apply to your modifications.
40 * If you do not wish that, delete this exception notice. */
47 #include "libguile/_scm.h"
48 #include "libguile/chars.h"
49 #include "libguile/continuations.h"
50 #include "libguile/smob.h"
51 #include "libguile/eval.h"
52 #include "libguile/macros.h"
53 #include "libguile/procprop.h"
54 #include "libguile/read.h"
55 #include "libguile/weaks.h"
56 #include "libguile/unif.h"
57 #include "libguile/alist.h"
58 #include "libguile/struct.h"
59 #include "libguile/objects.h"
60 #include "libguile/ports.h"
61 #include "libguile/root.h"
62 #include "libguile/strings.h"
63 #include "libguile/strports.h"
64 #include "libguile/vectors.h"
65 #include "libguile/lang.h"
67 #include "libguile/validate.h"
68 #include "libguile/print.h"
71 /* {Names of immediate symbols}
73 * This table must agree with the declarations in scm.h: {Immediate Symbols}.
76 char *scm_isymnames
[] =
78 /* This table must agree with the list of SCM_IM_ constants in tags.h */
94 "#@literal-variable-ref",
95 "#@literal-variable-set!",
98 "#@call-with-current-continuation",
100 /* user visible ISYMS */
114 /* Multi-language support */
120 "#@call-with-values",
124 /* Elisp nil value. This is its Scheme name; whenever it's printed
125 in Elisp, it should appear as the symbol `nil'. */
130 scm_t_option scm_print_opts
[] = {
131 { SCM_OPTION_SCM
, "closure-hook", SCM_UNPACK (SCM_BOOL_F
),
132 "Hook for printing closures (should handle macros as well)." },
133 { SCM_OPTION_BOOLEAN
, "source", 0,
134 "Print closures with source." }
137 SCM_DEFINE (scm_print_options
, "print-options-interface", 0, 1, 0,
139 "Option interface for the print options. Instead of using\n"
140 "this procedure directly, use the procedures\n"
141 "@code{print-enable}, @code{print-disable}, @code{print-set!}\n"
142 "and @code{print-options}.")
143 #define FUNC_NAME s_scm_print_options
145 SCM ans
= scm_options (setting
,
154 /* {Printing of Scheme Objects}
157 /* Detection of circular references.
159 * Due to other constraints in the implementation, this code has bad
160 * time complexity (O (depth * N)), The printer code can be
161 * rewritten to be O(N).
163 #define PUSH_REF(pstate, obj) \
165 pstate->ref_stack[pstate->top++] = (obj); \
166 if (pstate->top == pstate->ceiling) \
167 grow_ref_stack (pstate); \
170 #define ENTER_NESTED_DATA(pstate, obj, label) \
172 register unsigned long i; \
173 for (i = 0; i < pstate->top; ++i) \
174 if (SCM_EQ_P (pstate->ref_stack[i], (obj))) \
176 if (pstate->fancyp) \
178 if (pstate->top - pstate->list_offset >= pstate->level) \
180 scm_putc ('#', port); \
184 PUSH_REF(pstate, obj); \
187 #define EXIT_NESTED_DATA(pstate) { --pstate->top; }
189 SCM scm_print_state_vtable
= SCM_BOOL_F
;
190 static SCM print_state_pool
= SCM_EOL
;
192 #ifdef GUILE_DEBUG /* Used for debugging purposes */
194 SCM_DEFINE (scm_current_pstate
, "current-pstate", 0, 0, 0,
196 "Return the current-pstate -- the car of the\n"
197 "@code{print_state_pool}. @code{current-pstate} is only\n"
198 "included in @code{--enable-guile-debug} builds.")
199 #define FUNC_NAME s_scm_current_pstate
201 if (!SCM_NULLP (print_state_pool
))
202 return SCM_CAR (print_state_pool
);
210 #define PSTATE_SIZE 50L
213 make_print_state (void)
216 = scm_make_struct (scm_print_state_vtable
, SCM_INUM0
, SCM_EOL
);
217 scm_print_state
*pstate
= SCM_PRINT_STATE (print_state
);
218 pstate
->ref_vect
= scm_c_make_vector (PSTATE_SIZE
, SCM_UNDEFINED
);
219 pstate
->ref_stack
= SCM_VELTS (pstate
->ref_vect
);
220 pstate
->ceiling
= SCM_VECTOR_LENGTH (pstate
->ref_vect
);
225 scm_make_print_state ()
227 SCM answer
= SCM_BOOL_F
;
229 /* First try to allocate a print state from the pool */
231 if (!SCM_NULLP (print_state_pool
))
233 answer
= SCM_CAR (print_state_pool
);
234 print_state_pool
= SCM_CDR (print_state_pool
);
238 return SCM_FALSEP (answer
) ? make_print_state () : answer
;
242 scm_free_print_state (SCM print_state
)
245 scm_print_state
*pstate
= SCM_PRINT_STATE (print_state
);
246 /* Cleanup before returning print state to pool.
247 * It is better to do it here. Doing it in scm_prin1
248 * would cost more since that function is called much more
252 pstate
->revealed
= 0;
254 handle
= scm_cons (print_state
, print_state_pool
);
255 print_state_pool
= handle
;
260 grow_ref_stack (scm_print_state
*pstate
)
262 unsigned long int old_size
= SCM_VECTOR_LENGTH (pstate
->ref_vect
);
263 SCM
*old_elts
= SCM_VELTS (pstate
->ref_vect
);
264 unsigned long int new_size
= 2 * pstate
->ceiling
;
265 SCM new_vect
= scm_c_make_vector (new_size
, SCM_UNDEFINED
);
266 SCM
*new_elts
= SCM_VELTS (new_vect
);
269 for (i
= 0; i
!= old_size
; ++i
)
270 new_elts
[i
] = old_elts
[i
];
272 pstate
->ref_vect
= new_vect
;
273 pstate
->ref_stack
= new_elts
;
274 pstate
->ceiling
= new_size
;
279 print_circref (SCM port
,scm_print_state
*pstate
,SCM ref
)
282 long self
= pstate
->top
- 1;
284 if (SCM_CONSP (pstate
->ref_stack
[i
]))
288 if (!SCM_CONSP (pstate
->ref_stack
[i
- 1])
289 || !SCM_EQ_P (SCM_CDR (pstate
->ref_stack
[i
- 1]),
290 pstate
->ref_stack
[i
]))
296 for (i
= pstate
->top
- 1; 1; --i
)
297 if (SCM_EQ_P (pstate
->ref_stack
[i
], ref
))
299 scm_putc ('#', port
);
300 scm_intprint (i
- self
, 10, port
);
301 scm_putc ('#', port
);
304 /* Print the name of a symbol. */
307 scm_print_symbol_name (const char *str
, size_t len
, SCM port
)
319 /* XXX - Lots of weird symbol names are missed, such as "12" or
323 scm_lfwrite ("#{}#", 4, port
);
324 else if (str
[0] == '#' || str
[0] == ':' || str
[len
-1] == ':')
326 scm_lfwrite ("#{", 2, port
);
330 for (end
= pos
; end
< len
; ++end
)
333 #ifdef BRACKETS_AS_PARENS
341 case SCM_WHITE_SPACES
:
342 case SCM_LINE_INCREMENTORS
:
351 scm_lfwrite ("#{", 2, port
);
356 scm_lfwrite (str
+ pos
, end
- pos
, port
);
362 scm_lfwrite (buf
, 2, port
);
384 scm_lfwrite (str
+ pos
, end
- pos
, port
);
386 scm_lfwrite ("}#", 2, port
);
389 /* Print generally. Handles both write and display according to PSTATE.
391 SCM_GPROC(s_write
, "write", 1, 1, 0, scm_write
, g_write
);
392 SCM_GPROC(s_display
, "display", 1, 1, 0, scm_display
, g_display
);
395 scm_iprin1 (SCM exp
, SCM port
, scm_print_state
*pstate
)
397 switch (SCM_ITAG3 (exp
))
399 case scm_tc3_closure
:
402 /* These tc3 tags should never occur in an immediate value. They are
403 * only used in cell types of non-immediates, i. e. the value returned
404 * by SCM_CELL_TYPE (exp) can use these tags.
406 scm_ipruk ("immediate", exp
, port
);
410 scm_intprint (SCM_INUM (exp
), 10, port
);
415 long i
= SCM_CHAR (exp
);
417 if (SCM_WRITINGP (pstate
))
419 scm_puts ("#\\", port
);
420 if ((i
>= 0) && (i
<= ' ') && scm_charnames
[i
])
421 scm_puts (scm_charnames
[i
], port
);
423 else if (i
== '\177')
424 scm_puts (scm_charnames
[scm_n_charnames
- 1], port
);
426 else if (i
< 0 || i
> '\177')
427 scm_intprint (i
, 8, port
);
434 else if (SCM_IFLAGP (exp
)
435 && ((size_t) SCM_ISYMNUM (exp
) < (sizeof scm_isymnames
/ sizeof (char *))))
436 scm_puts (SCM_ISYMCHARS (exp
), port
);
437 else if (SCM_ILOCP (exp
))
439 scm_puts ("#@", port
);
440 scm_intprint ((long) SCM_IFRAME (exp
), 10, port
);
441 scm_putc (SCM_ICDRP (exp
) ? '-' : '+', port
);
442 scm_intprint ((long) SCM_IDIST (exp
), 10, port
);
446 /* unknown immediate value */
447 scm_ipruk ("immediate", exp
, port
);
451 switch (SCM_TYP7 (exp
))
455 ENTER_NESTED_DATA (pstate
, exp
, circref
);
456 if (SCM_OBJ_CLASS_FLAGS (exp
) & SCM_CLASSF_GOOPS
)
458 SCM pwps
, print
= pstate
->writingp
? g_write
: g_display
;
462 scm_tc16_port_with_ps
,
463 SCM_UNPACK (scm_cons (port
, pstate
->handle
)));
464 pstate
->revealed
= 1;
465 scm_call_generic_2 (print
, exp
, pwps
);
470 scm_print_struct (exp
, port
, pstate
);
472 EXIT_NESTED_DATA (pstate
);
475 case scm_tcs_cons_imcar
:
476 case scm_tcs_cons_nimcar
:
477 ENTER_NESTED_DATA (pstate
, exp
, circref
);
478 scm_iprlist ("(", exp
, ')', port
, pstate
);
479 EXIT_NESTED_DATA (pstate
);
482 print_circref (port
, pstate
, exp
);
484 case scm_tcs_closures
:
485 if (SCM_FALSEP (scm_procedure_p (SCM_PRINT_CLOSURE
))
486 || SCM_FALSEP (scm_printer_apply (SCM_PRINT_CLOSURE
,
489 SCM formals
= SCM_CLOSURE_FORMALS (exp
);
490 scm_puts ("#<procedure", port
);
491 scm_putc (' ', port
);
492 scm_iprin1 (scm_procedure_name (exp
), port
, pstate
);
493 scm_putc (' ', port
);
494 if (SCM_PRINT_SOURCE_P
)
496 SCM env
= SCM_ENV (exp
);
497 SCM xenv
= SCM_EXTEND_ENV (formals
, SCM_EOL
, env
);
498 SCM src
= scm_unmemocopy (SCM_CODE (exp
), xenv
);
499 ENTER_NESTED_DATA (pstate
, exp
, circref
);
500 scm_iprin1 (src
, port
, pstate
);
501 EXIT_NESTED_DATA (pstate
);
504 scm_iprin1 (formals
, port
, pstate
);
505 scm_putc ('>', port
);
509 if (SCM_WRITINGP (pstate
))
513 scm_putc ('"', port
);
514 for (i
= 0; i
< SCM_STRING_LENGTH (exp
); ++i
)
515 switch (SCM_STRING_CHARS (exp
)[i
])
519 scm_putc ('\\', port
);
521 scm_putc (SCM_STRING_CHARS (exp
)[i
], port
);
523 scm_putc ('"', port
);
527 scm_lfwrite (SCM_STRING_CHARS (exp
), SCM_STRING_LENGTH (exp
), port
);
530 if (SCM_SYMBOL_INTERNED_P (exp
))
532 scm_print_symbol_name (SCM_SYMBOL_CHARS (exp
),
533 SCM_SYMBOL_LENGTH (exp
),
535 scm_remember_upto_here_1 (exp
);
539 scm_puts ("#<uninterned-symbol ", port
);
540 scm_print_symbol_name (SCM_SYMBOL_CHARS (exp
),
541 SCM_SYMBOL_LENGTH (exp
),
543 scm_putc (' ', port
);
544 scm_intprint ((long)exp
, 16, port
);
545 scm_putc ('>', port
);
548 case scm_tc7_variable
:
549 scm_i_variable_print (exp
, port
, pstate
);
552 ENTER_NESTED_DATA (pstate
, exp
, circref
);
553 if (SCM_IS_WHVEC (exp
))
554 scm_puts ("#wh(", port
);
556 scm_puts ("#w(", port
);
557 goto common_vector_printer
;
560 ENTER_NESTED_DATA (pstate
, exp
, circref
);
561 scm_puts ("#(", port
);
562 common_vector_printer
:
565 long last
= SCM_VECTOR_LENGTH (exp
) - 1;
567 if (pstate
->fancyp
&& SCM_VECTOR_LENGTH (exp
) > pstate
->length
)
569 last
= pstate
->length
- 1;
572 for (i
= 0; i
< last
; ++i
)
575 scm_iprin1 (SCM_VELTS (exp
)[i
], port
, pstate
);
576 scm_putc (' ', port
);
581 scm_iprin1 (SCM_VELTS (exp
)[i
], port
, pstate
);
584 scm_puts (" ...", port
);
585 scm_putc (')', port
);
587 EXIT_NESTED_DATA (pstate
);
598 #ifdef HAVE_LONG_LONGS
601 scm_raprin1 (exp
, port
, pstate
);
605 scm_puts (SCM_SUBR_GENERIC (exp
) && *SCM_SUBR_GENERIC (exp
)
606 ? "#<primitive-generic "
607 : "#<primitive-procedure ",
609 scm_puts (SCM_SYMBOL_CHARS (SCM_SNAME (exp
)), port
);
610 scm_putc ('>', port
);
615 SCM proc
= SCM_CCLO_SUBR (exp
);
616 if (SCM_EQ_P (proc
, scm_f_gsubr_apply
))
618 /* Print gsubrs as primitives */
619 SCM name
= scm_procedure_name (exp
);
620 scm_puts ("#<primitive-procedure", port
);
621 if (!SCM_FALSEP (name
))
623 scm_putc (' ', port
);
624 scm_puts (SCM_SYMBOL_CHARS (name
), port
);
629 scm_puts ("#<compiled-closure ", port
);
630 scm_iprin1 (proc
, port
, pstate
);
632 scm_putc ('>', port
);
637 scm_puts ("#<procedure-with-setter", port
);
639 SCM name
= scm_procedure_name (exp
);
640 if (!SCM_FALSEP (name
))
642 scm_putc (' ', port
);
643 scm_display (name
, port
);
646 scm_putc ('>', port
);
650 register long i
= SCM_PTOBNUM (exp
);
652 && scm_ptobs
[i
].print
653 && (scm_ptobs
[i
].print
) (exp
, port
, pstate
))
658 ENTER_NESTED_DATA (pstate
, exp
, circref
);
659 SCM_SMOB_DESCRIPTOR (exp
).print (exp
, port
, pstate
);
660 EXIT_NESTED_DATA (pstate
);
664 scm_ipruk ("type", exp
, port
);
669 /* Print states are necessary for circular reference safe printing.
670 * They are also expensive to allocate. Therefore print states are
671 * kept in a pool so that they can be reused.
674 /* The PORT argument can also be a print-state/port pair, which will
675 * then be used instead of allocating a new print state. This is
676 * useful for continuing a chain of print calls from Scheme. */
679 scm_prin1 (SCM exp
, SCM port
, int writingp
)
681 SCM handle
= SCM_BOOL_F
; /* Will GC protect the handle whilst unlinked */
683 scm_print_state
*pstate
;
685 /* If PORT is a print-state/port pair, use that. Else create a new
688 if (SCM_PORT_WITH_PS_P (port
))
690 pstate_scm
= SCM_PORT_WITH_PS_PS (port
);
691 port
= SCM_PORT_WITH_PS_PORT (port
);
695 /* First try to allocate a print state from the pool */
697 if (!SCM_NULLP (print_state_pool
))
699 handle
= print_state_pool
;
700 print_state_pool
= SCM_CDR (print_state_pool
);
703 if (SCM_FALSEP (handle
))
704 handle
= scm_list_1 (make_print_state ());
705 pstate_scm
= SCM_CAR (handle
);
708 pstate
= SCM_PRINT_STATE (pstate_scm
);
709 pstate
->writingp
= writingp
;
710 scm_iprin1 (exp
, port
, pstate
);
712 /* Return print state to pool if it has been created above and
713 hasn't escaped to Scheme. */
715 if (!SCM_FALSEP (handle
) && !pstate
->revealed
)
718 SCM_SETCDR (handle
, print_state_pool
);
719 print_state_pool
= handle
;
729 scm_intprint (long n
, int radix
, SCM port
)
731 char num_buf
[SCM_INTBUFLEN
];
732 scm_lfwrite (num_buf
, scm_iint2str (n
, radix
, num_buf
), port
);
735 /* Print an object of unrecognized type.
739 scm_ipruk (char *hdr
, SCM ptr
, SCM port
)
741 scm_puts ("#<unknown-", port
);
742 scm_puts (hdr
, port
);
745 scm_puts (" (0x", port
);
746 scm_intprint (SCM_CELL_WORD_0 (ptr
), 16, port
);
747 scm_puts (" . 0x", port
);
748 scm_intprint (SCM_CELL_WORD_1 (ptr
), 16, port
);
749 scm_puts (") @", port
);
751 scm_puts (" 0x", port
);
752 scm_intprint (SCM_UNPACK (ptr
), 16, port
);
753 scm_putc ('>', port
);
760 scm_iprlist (char *hdr
,SCM exp
,int tlr
,SCM port
,scm_print_state
*pstate
)
762 register SCM hare
, tortoise
;
763 long floor
= pstate
->top
- 2;
764 scm_puts (hdr
, port
);
769 /* Run a hare and tortoise so that total time complexity will be
770 O(depth * N) instead of O(N^2). */
771 hare
= SCM_CDR (exp
);
773 while (SCM_CONSP (hare
))
775 if (SCM_EQ_P (hare
, tortoise
))
777 hare
= SCM_CDR (hare
);
778 if (!SCM_CONSP (hare
))
780 hare
= SCM_CDR (hare
);
781 tortoise
= SCM_CDR (tortoise
);
784 /* No cdr cycles intrinsic to this list */
785 scm_iprin1 (SCM_CAR (exp
), port
, pstate
);
786 for (exp
= SCM_CDR (exp
); SCM_CONSP (exp
); exp
= SCM_CDR (exp
))
790 for (i
= floor
; i
>= 0; --i
)
791 if (SCM_EQ_P (pstate
->ref_stack
[i
], exp
))
793 PUSH_REF (pstate
, exp
);
794 scm_putc (' ', port
);
796 scm_iprin1 (SCM_CAR (exp
), port
, pstate
);
798 if (!SCM_NULL_OR_NIL_P (exp
))
800 scm_puts (" . ", port
);
801 scm_iprin1 (exp
, port
, pstate
);
805 scm_putc (tlr
, port
);
806 pstate
->top
= floor
+ 2;
811 long n
= pstate
->length
;
813 scm_iprin1 (SCM_CAR (exp
), port
, pstate
);
814 exp
= SCM_CDR (exp
); --n
;
815 for (; SCM_CONSP (exp
); exp
= SCM_CDR (exp
))
817 register unsigned long i
;
819 for (i
= 0; i
< pstate
->top
; ++i
)
820 if (SCM_EQ_P (pstate
->ref_stack
[i
], exp
))
826 scm_puts (" ...", port
);
832 PUSH_REF(pstate
, exp
);
833 ++pstate
->list_offset
;
834 scm_putc (' ', port
);
836 scm_iprin1 (SCM_CAR (exp
), port
, pstate
);
839 if (!SCM_NULL_OR_NIL_P (exp
))
841 scm_puts (" . ", port
);
842 scm_iprin1 (exp
, port
, pstate
);
845 pstate
->list_offset
-= pstate
->top
- floor
- 2;
849 pstate
->list_offset
-= pstate
->top
- floor
- 2;
852 scm_puts (" . ", port
);
853 print_circref (port
, pstate
, exp
);
860 scm_valid_oport_value_p (SCM val
)
862 return (SCM_OPOUTPORTP (val
)
863 || (SCM_PORT_WITH_PS_P (val
)
864 && SCM_OPOUTPORTP (SCM_PORT_WITH_PS_PORT (val
))));
867 /* SCM_GPROC(s_write, "write", 1, 1, 0, scm_write, g_write); */
870 scm_write (SCM obj
, SCM port
)
872 if (SCM_UNBNDP (port
))
875 SCM_ASSERT (scm_valid_oport_value_p (port
), port
, SCM_ARG2
, s_write
);
877 scm_prin1 (obj
, port
, 1);
881 scm_close_port (port
);
884 return SCM_UNSPECIFIED
;
888 /* SCM_GPROC(s_display, "display", 1, 1, 0, scm_display, g_display); */
891 scm_display (SCM obj
, SCM port
)
893 if (SCM_UNBNDP (port
))
896 SCM_ASSERT (scm_valid_oport_value_p (port
), port
, SCM_ARG2
, s_display
);
898 scm_prin1 (obj
, port
, 0);
902 scm_close_port (port
);
905 return SCM_UNSPECIFIED
;
909 SCM_DEFINE (scm_simple_format
, "simple-format", 2, 0, 1,
910 (SCM destination
, SCM message
, SCM args
),
911 "Write @var{message} to @var{destination}, defaulting to\n"
912 "the current output port.\n"
913 "@var{message} can contain @code{~A} (was @code{%s}) and\n"
914 "@code{~S} (was @code{%S}) escapes. When printed,\n"
915 "the escapes are replaced with corresponding members of\n"
917 "@code{~A} formats using @code{display} and @code{~S} formats\n"
918 "using @code{write}.\n"
919 "If @var{destination} is @code{#t}, then use the current output\n"
920 "port, if @var{destination} is @code{#f}, then return a string\n"
921 "containing the formatted text. Does not add a trailing newline.")
922 #define FUNC_NAME s_scm_simple_format
924 SCM answer
= SCM_UNSPECIFIED
;
925 int fReturnString
= 0;
931 if (SCM_EQ_P (destination
, SCM_BOOL_T
))
933 destination
= scm_cur_outp
;
935 else if (SCM_FALSEP (destination
))
938 destination
= scm_mkstrport (SCM_INUM0
,
939 scm_make_string (SCM_INUM0
, SCM_UNDEFINED
),
945 SCM_VALIDATE_OPORT_VALUE (1, destination
);
946 destination
= SCM_COERCE_OUTPORT (destination
);
948 SCM_VALIDATE_STRING (2, message
);
949 SCM_VALIDATE_REST_ARGUMENT (args
);
951 start
= SCM_STRING_CHARS (message
);
952 end
= start
+ SCM_STRING_LENGTH (message
);
953 for (p
= start
; p
!= end
; ++p
)
968 scm_lfwrite (start
, p
- start
, destination
);
972 scm_newline (destination
);
976 SCM_MISC_ERROR ("FORMAT: Unsupported format option ~~~A - use (ice-9 format) instead",
977 scm_list_1 (SCM_MAKE_CHAR (*p
)));
982 if (!SCM_CONSP (args
))
983 SCM_MISC_ERROR ("FORMAT: Missing argument for ~~~A",
984 scm_list_1 (SCM_MAKE_CHAR (*p
)));
986 scm_lfwrite (start
, p
- start
- 1, destination
);
987 scm_prin1 (SCM_CAR (args
), destination
, writingp
);
988 args
= SCM_CDR (args
);
992 scm_lfwrite (start
, p
- start
, destination
);
993 if (!SCM_EQ_P (args
, SCM_EOL
))
994 SCM_MISC_ERROR ("FORMAT: ~A superfluous arguments",
995 scm_list_1 (scm_length (args
)));
998 answer
= scm_strport_to_string (destination
);
1000 return scm_return_first (answer
, message
);
1005 SCM_DEFINE (scm_newline
, "newline", 0, 1, 0,
1007 "Send a newline to @var{port}.\n"
1008 "If @var{port} is omitted, send to the current output port.")
1009 #define FUNC_NAME s_scm_newline
1011 if (SCM_UNBNDP (port
))
1012 port
= scm_cur_outp
;
1014 SCM_VALIDATE_OPORT_VALUE (1,port
);
1016 scm_putc ('\n', SCM_COERCE_OUTPORT (port
));
1017 return SCM_UNSPECIFIED
;
1021 SCM_DEFINE (scm_write_char
, "write-char", 1, 1, 0,
1022 (SCM chr
, SCM port
),
1023 "Send character @var{chr} to @var{port}.")
1024 #define FUNC_NAME s_scm_write_char
1026 if (SCM_UNBNDP (port
))
1027 port
= scm_cur_outp
;
1029 SCM_VALIDATE_CHAR (1,chr
);
1030 SCM_VALIDATE_OPORT_VALUE (2,port
);
1032 scm_putc ((int) SCM_CHAR (chr
), SCM_COERCE_OUTPORT (port
));
1036 scm_close_port (port
);
1039 return SCM_UNSPECIFIED
;
1045 /* Call back to Scheme code to do the printing of special objects
1046 * (like structs). SCM_PRINTER_APPLY applies PROC to EXP and a smob
1047 * containing PORT and PSTATE. This object can be used as the port for
1048 * display/write etc to continue the current print chain. The REVEALED
1049 * field of PSTATE is set to true to indicate that the print state has
1050 * escaped to Scheme and thus has to be freed by the GC.
1053 scm_t_bits scm_tc16_port_with_ps
;
1055 /* Print exactly as the port itself would */
1058 port_with_ps_print (SCM obj
, SCM port
, scm_print_state
*pstate
)
1060 obj
= SCM_PORT_WITH_PS_PORT (obj
);
1061 return scm_ptobs
[SCM_PTOBNUM (obj
)].print (obj
, port
, pstate
);
1065 scm_printer_apply (SCM proc
, SCM exp
, SCM port
, scm_print_state
*pstate
)
1068 SCM pair
= scm_cons (port
, pstate
->handle
);
1069 SCM_NEWSMOB (pwps
, scm_tc16_port_with_ps
, SCM_UNPACK (pair
));
1070 pstate
->revealed
= 1;
1071 return scm_call_2 (proc
, exp
, pwps
);
1074 SCM_DEFINE (scm_port_with_print_state
, "port-with-print-state", 2, 0, 0,
1075 (SCM port
, SCM pstate
),
1076 "Create a new port which behaves like @var{port}, but with an\n"
1077 "included print state @var{pstate}.")
1078 #define FUNC_NAME s_scm_port_with_print_state
1081 SCM_VALIDATE_OPORT_VALUE (1,port
);
1082 SCM_VALIDATE_PRINTSTATE (2,pstate
);
1083 port
= SCM_COERCE_OUTPORT (port
);
1084 SCM_NEWSMOB (pwps
, scm_tc16_port_with_ps
, SCM_UNPACK (scm_cons (port
, pstate
)));
1089 SCM_DEFINE (scm_get_print_state
, "get-print-state", 1, 0, 0,
1091 "Return the print state of the port @var{port}. If @var{port}\n"
1092 "has no associated print state, @code{#f} is returned.")
1093 #define FUNC_NAME s_scm_get_print_state
1095 if (SCM_PORT_WITH_PS_P (port
))
1096 return SCM_PORT_WITH_PS_PS (port
);
1097 if (SCM_OUTPUT_PORT_P (port
))
1099 SCM_WRONG_TYPE_ARG (1, port
);
1108 SCM vtable
, layout
, type
;
1110 scm_init_opts (scm_print_options
, scm_print_opts
, SCM_N_PRINT_OPTIONS
);
1112 scm_gc_register_root (&print_state_pool
);
1113 scm_gc_register_root (&scm_print_state_vtable
);
1114 vtable
= scm_make_vtable_vtable (scm_nullstr
, SCM_INUM0
, SCM_EOL
);
1115 layout
= scm_make_struct_layout (scm_makfrom0str (SCM_PRINT_STATE_LAYOUT
));
1116 type
= scm_make_struct (vtable
, SCM_INUM0
, scm_list_1 (layout
));
1117 scm_set_struct_vtable_name_x (type
, scm_str2symbol ("print-state"));
1118 scm_print_state_vtable
= type
;
1120 /* Don't want to bind a wrapper class in GOOPS, so pass 0 as arg1. */
1121 scm_tc16_port_with_ps
= scm_make_smob_type (0, 0);
1122 scm_set_smob_mark (scm_tc16_port_with_ps
, scm_markcdr
);
1123 scm_set_smob_print (scm_tc16_port_with_ps
, port_with_ps_print
);
1125 #include "libguile/print.x"