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printer.c
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#include <stdio.h>
#include <stdlib.h>
#include "memory.h"
#include "output.h"
#define internal static
internal void print_cons(output_t *output, object_p cons_obj);
void
scm_print_object(output_t *output, object_p obj)
{
switch (TAG(obj)) {
case T_SCANNER:
if (obj->scanner.pending)
scm_out_printf(output, "...");
else
scm_out_printf(output, "> ");
for (int i=0;i<=obj->scanner.nparens_expected;i++)
scm_out_printf(output, " ");
break;
case T_NUMBER:
scm_out_printf(output, "%lld", NUMBER_VAL(obj));
break;
case T_CONS:
if (CAR(obj) == define_symbol && IS_CONS(CDR(obj))) {
scm_out_printf(output, "'");
scm_print_object(output, CDR(obj));
} else {
print_cons(output, obj);
}
break;
case T_STRING:
scm_out_printf(output, "\"");
for(int i=0;i<obj->string.value->slen;i++) {
char c = obj->string.value->data[i];
switch (c) {
case '\r':
scm_out_printf(output, "\\r");
break;
case '\t':
scm_out_printf(output, "\\t");
break;
case '\n':
scm_out_printf(output, "\\n");
break;
default:
scm_out_printf(output, "%c", c);
break;
}
}
scm_out_printf(output, "\"");
break;
case T_USERDEFINED_FUNC:
scm_out_printf(output, "<procedure: %s>", USERDEFINED_NAME(obj));
break;
case T_SYMBOL:
scm_out_printf(output, "%s", SYMBOL_VAL(obj));
break;
case T_NIL:
scm_out_printf(output, "nil");
break;
case T_TRUE:
scm_out_printf(output, "#t");
break;
case T_FALSE:
scm_out_printf(output, "#f");
break;
default:
scm_out_printf(output, "unknown object");
break;
}
}
internal void
print_cons(output_t *output, object_p cons_obj)
{
scm_out_printf(output, "(");
while (IS_CONS(cons_obj)) {
scm_print_object(output, CAR(cons_obj));
cons_obj = CDR(cons_obj);
if (IS_CONS(cons_obj))
scm_out_printf(output, " ");
}
if (!IS_NIL(cons_obj)) {
scm_out_printf(output, " . ");
scm_print_object(output, cons_obj);
}
scm_out_printf(output, ")");
}