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#include "interpreter.h"
#include "program.h"
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
static void loop_end(Program* program) {
uint32_t count = 1;
Symbol s;
while (true) {
program_next(program, &s);
if (s == StartLoop) {
count++;
} else if (s == EndLoop) {
count--;
} else if (s == Eof) {
return;
}
if (count == 0) return;
}
}
static void loop_start(Program* program) {
uint32_t count = 1;
Symbol s;
program_last(program, &s);
while (true) {
program_last(program, &s);
if (s == StartLoop) {
count--;
} else if (s == EndLoop) {
count++;
} else if (s == Eof) {
return;
}
if (count == 0) {
return;
};
}
}
static void recurse_program(Program* program, Tape* tape) {
Symbol s;
next:
program_next(program, &s);
// printf("[");
// for(uint32_t i = 0; i < tape->len; i++) {
// printf("0x%02x ", tape->data[i]);
// }
// printf("\b]\n ");
// for(uint32_t i = 0; i < tape->len; i++) {
// if (i == tape->index) {
// printf(" ^ ");
// } else {
// printf(" ");
// }
// }
// printf(" \ + tape->indexn");
switch (s) {
case MoveLeft:
tape_left(tape);
break;
case MoveRight:
tape_right(tape);
break;
case Increment:
tape_set(tape, tape_get(tape) + 1);
break;
case Decrement:
tape_set(tape, tape_get(tape) - 1);
break;
case StartLoop:
if (tape_get(tape) == 0)
loop_end(program);
break;
case EndLoop:
if (tape_get(tape) != 0)
loop_start(program);
break;
case PutChar: {
printf("%c", tape_get(tape));
break;
}
case GetChar: {
uint8_t c = (uint8_t) getchar();
tape_set(tape, c);
break;
}
case Allocate: {
uint8_t len = tape_get(tape);
Tape* new = malloc(sizeof(Tape));
tape_init(len, new);
void* ptr = (void*) tape_ptr(tape);
memcpy(ptr, &new, sizeof(Tape*));
break;
}
case Free: {
Tape* old;
void* ptr = (void*) tape_ptr(tape);
memcpy(&old, ptr, sizeof(Tape*));
memset(ptr, 0, sizeof(Tape*));
tape_free(tape);
free(old);
break;
}
case EnterTape: {
Tape* cur;
void* ptr = (void*) tape_ptr(tape);
memcpy(&cur, ptr, sizeof(Tape*));
recurse_program(program, cur);
break;
}
case GetString: {
uint8_t len = tape_get(tape);
void* ptr = (void*) tape_ptr(tape);
fgets(ptr, len, stdin);
break;
}
case PutString: {
char* ptr = (char*) tape_ptr(tape);
printf("%s", ptr);
break;
}
case Clear:
printf("\033c");
break;
case LeaveTape:
case Eof:
case Invalid:
return;
}
goto next;
}
void run_program(Program* program) {
Tape tape;
tape_init(sizeof(void*), &tape);
recurse_program(program, &tape);
tape_free(&tape);
}
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