from . import biff12
from .reader import BIFF12Reader

class StringTable(object):
  def __init__(self, fp):
    super(StringTable, self).__init__()
    self._reader = BIFF12Reader(fp=fp)
    self._strings = []
    self._parse()

  def __enter__(self):
    return self

  def __exit__(self, type, value, traceback):
    self.close()

  def __getitem__(self, key):
    return self._strings[key]

  def _parse(self):
    for item in self._reader:
      if item[0] == biff12.SI:
        self._strings.append(item[1].t)
      elif item[0] == biff12.SST_END:
        break

  def get_string(self, idx):
    return self._strings[idx]

  def close(self):
    self._reader.close()