#include "all.h"
#include "ivec.h"
#include <stdlib.h>

lexer_t lex_init(str *src) {
  lexer_t lx = {0};

  lx.src = src;
  lx.pos = 0;
  lx.tokens = (ivec){0};

  return lx;
}

void lex_run(lexer_t *lx) {
  for (size_t i = 0; i < lx->src->length; i++) {
    char c = lx->src->data[i];
    lex_tok_e tok;
    switch (c) {
    case '+':
      tok = LEX_PINC;
      break;
    case '-':
      tok = LEX_PDEC;
      break;
    case '>':
      tok = LEX_VINC;
      break;
    case '<':
      tok = LEX_VDEC;
      break;
    case '.':
      tok = LEX_OUT;
      break;
    case ',':
      tok = LEX_IN;
      break;
    case '[':
      tok = LEX_LB;
      break;
    case ']':
      tok = LEX_RB;
      break;
    default:
      continue;
    }
    iv_push(&lx->tokens, tok);
  }
  iv_push(&lx->tokens, LEX_EOF);
}

void lex_free(lexer_t *lx) {
  if (!lx)
    return;
  iv_free(&lx->tokens);
  if (lx->src) {
    free(lx->src->data);
    free(lx->src);
  }
  lx->src = NULL;
  lx->pos = 0;
}