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#include "program.h"
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <errno.h>
static FILE* f;
static uint32_t count;
static char next_char() {
char c;
if (fread(&c, 1, 1, f) != 1) {
return EOF;
} else {
count++;
return c;
}
}
static Symbol next_symbol() {
char c = next_char();
retest:
switch (c) {
case '<':
return MoveLeft;
case '>':
return MoveRight;
case '+':
return Increment;
case '-':
return Decrement;
case '[':
return StartLoop;
case ']':
return EndLoop;
case '.':
return PutChar;
case ',':
return GetChar;
case '*':
return Allocate;
case '!':
return Free;
case '(':
return EnterTape;
case ')':
return LeaveTape;
case '`':
return PutString;
case '~':
return GetString;
case '%':
return Clear;
case '\n':
case '\t':
case ' ':
while(c = next_char(), c == '\n' || c == '\t' || c == ' ');
goto retest;
case '/':
while(c = next_char(), c != '\n' && c != EOF);
goto retest;
case EOF:
return Eof;
default:
return Invalid;
}
}
void program_init(char* file_path, Program* program) {
f = fopen (file_path, "r");
if (f == NULL) {
printf("error: failed to open %s (%s)\n", file_path, strerror(errno));
exit(EXIT_FAILURE);
}
uint32_t capacity = 8;
count = 0;
program->data = malloc(capacity * sizeof(Symbol));
program->len = 0;
Symbol s;
while(true) {
s = next_symbol();
if (s == Invalid) {
printf("error: invalid symbol at character %d\n", count);
exit(EXIT_FAILURE);
}
if (program->len == capacity) {
capacity *= 2;
program->data = realloc(program->data, capacity * sizeof(Symbol));
}
program->data[program->len] = s;
program->len++;
if (s == Eof) break;
}
fclose(f);
}
void program_peek(Program* program, Symbol* symbol) {
*symbol = program->data[program->index];
}
void program_next(Program* program, Symbol* symbol) {
if (program->index >= program->len) {
*symbol = Eof;
return;
}
program_peek(program, symbol);
program->index++;
}
void program_last(Program* program, Symbol* symbol) {
if (program->index == 0) {
*symbol = Eof;
return;
}
program->index--;
program_peek(program, symbol);
}
void program_free(Program* program) {
free(program->data);
}
void tape_init(uint32_t len, Tape* tape) {
tape->len = len;
tape->data = malloc(len);
tape->index = 0;
memset(tape->data, 0, len);
}
void tape_left(Tape* tape) {
if (tape->index == 0) {
tape->index = tape->len - 1;
} else {
tape->index--;
}
}
void tape_right(Tape* tape) {
tape->index++;
tape->index %= tape->len;
}
uint8_t tape_get(Tape* tape) {
return tape->data[tape->index];
}
void tape_set(Tape* tape, uint8_t value) {
tape->data[tape->index] = value;
}
uint8_t* tape_ptr(Tape* tape) {
return tape->data;
}
void tape_free(Tape* tape) {
free(tape->data);
}
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