return answer ? answer : make_print_state ();
}
-static char s_print_state_printer[] = "print-state-printer";
-static SCM
-print_state_printer (obj, port)
- SCM obj;
- SCM port;
-{
- /* This function can be made visible by means of struct-ref, so
- we need to make sure that it gets what it wants. */
- SCM_ASSERT (SCM_NIMP (obj) && SCM_PRINT_STATE_P (obj),
- obj,
- SCM_ARG1,
- s_print_state_printer);
- SCM_ASSERT (scm_valid_oport_value_p (port),
- port,
- SCM_ARG2,
- s_print_state_printer);
- port = SCM_COERCE_OUTPORT (port);
- scm_puts ("#<print-state ", port);
- scm_intprint (obj, 16, port);
- scm_putc ('>', port);
- return SCM_UNSPECIFIED;
-}
-
void
scm_free_print_state (print_state)
SCM print_state;
{
return (SCM_NIMP (val)
&& (SCM_OPOUTPORTP (val)
- || (SCM_CONSP (val)
- && SCM_NIMP (SCM_CAR (val))
- && SCM_OPOUTPORTP (SCM_CAR (val))
- && SCM_NIMP (SCM_CDR (val))
- && SCM_PRINT_STATE_P (SCM_CDR (val)))));
+ || (SCM_PORT_WITH_PS_P (val)
+ && SCM_OPOUTPORTP (SCM_PORT_WITH_PS_PORT (val)))));
}
SCM_PROC(s_write, "write", 1, 1, 0, scm_write);
\f
/* Call back to Scheme code to do the printing of special objects
-(like structs). SCM_PRINTER_APPLY applies PROC to EXP and a pair
-containing PORT and PSTATE. This pair can be used as the port for
-display/write etc to continue the current print chain. The REVEALED
-field of PSTATE is set to true to indicate that the print state has
-escaped to Scheme and thus has to be freed by the GC. */
+ * (like structs). SCM_PRINTER_APPLY applies PROC to EXP and a smob
+ * containing PORT and PSTATE. This object can be used as the port for
+ * display/write etc to continue the current print chain. The REVEALED
+ * field of PSTATE is set to true to indicate that the print state has
+ * escaped to Scheme and thus has to be freed by the GC.
+ */
+
+long scm_tc16_port_with_ps;
+
+/* Print exactly as the port itself would */
+
+static int
+print_port_with_ps (SCM obj, SCM port, scm_print_state *pstate)
+{
+ obj = SCM_PORT_WITH_PS_PORT (obj);
+ return scm_ptobs[SCM_PTOBNUM (obj)].print (obj, port, pstate);
+}
SCM
scm_printer_apply (proc, exp, port, pstate)
SCM proc, exp, port;
scm_print_state *pstate;
{
+ SCM pwps;
SCM pair = scm_cons (port, pstate->handle);
+ SCM_NEWSMOB (pwps, scm_tc16_port_with_ps, pair);
pstate->revealed = 1;
- return scm_apply (proc, exp, scm_cons (pair, scm_listofnull));
+ return scm_apply (proc, exp, scm_cons (pwps, scm_listofnull));
+}
+
+SCM_PROC (s_port_with_print_state, "port-with-print-state", 2, 0, 0, scm_port_with_print_state);
+
+SCM
+scm_port_with_print_state (SCM port, SCM pstate)
+{
+ SCM pwps;
+ SCM_ASSERT (scm_valid_oport_value_p (port),
+ port, SCM_ARG1, s_port_with_print_state);
+ SCM_ASSERT (SCM_NIMP (pstate) && SCM_PRINT_STATE_P (pstate),
+ pstate, SCM_ARG2, s_port_with_print_state);
+ port = SCM_COERCE_OUTPORT (port);
+ SCM_NEWSMOB (pwps, scm_tc16_port_with_ps, scm_cons (port, pstate));
+ return pwps;
+}
+
+SCM_PROC (s_get_print_state, "get-print-state", 1, 0, 0, scm_get_print_state);
+
+SCM
+scm_get_print_state (SCM port)
+{
+ if (SCM_NIMP (port))
+ {
+ if (SCM_PORT_WITH_PS_P (port))
+ return SCM_PORT_WITH_PS_PS (port);
+ if (SCM_OUTPORTP (port))
+ return SCM_BOOL_F;
+ }
+ return scm_wta (port, (char *) SCM_ARG1, s_get_print_state);
}
\f
void
scm_init_print ()
{
- SCM vtable, layout, printer, type;
+ SCM vtable, layout, type;
scm_init_opts (scm_print_options, scm_print_opts, SCM_N_PRINT_OPTIONS);
vtable = scm_make_vtable_vtable (scm_make_struct_layout (scm_nullstr),
SCM_INUM0,
SCM_EOL);
layout = scm_make_struct_layout (scm_makfrom0str (SCM_PRINT_STATE_LAYOUT));
- printer = scm_make_subr_opt (s_print_state_printer,
- scm_tc7_subr_2,
- (SCM (*) ()) print_state_printer,
- 0 /* Don't bind the name. */);
- type = scm_make_struct (vtable, SCM_INUM0, SCM_LIST2 (layout, printer));
+ type = scm_make_struct (vtable, SCM_INUM0, SCM_LIST1 (layout));
scm_set_struct_vtable_name_x (type, SCM_CAR (scm_intern0 ("print-state")));
print_state_pool = scm_permanent_object (scm_cons (type, SCM_EOL));
scm_print_state_vtable = type;
+ /* Don't want to bind a wrapper class in GOOPS, so pass 0 as arg1. */
+ scm_tc16_port_with_ps = scm_make_smob_type (0, 0);
+ scm_set_smob_mark (scm_tc16_port_with_ps, scm_markcdr);
+ scm_set_smob_print (scm_tc16_port_with_ps, print_port_with_ps);
+
#include "print.x"
}