""" from https://github.com/keithito/tacotron """
from text import cleaners


def text_to_sequence(text, symbols, cleaner_names):
  '''Converts a string of text to a sequence of IDs corresponding to the symbols in the text.
    Args:
      text: string to convert to a sequence
      cleaner_names: names of the cleaner functions to run the text through
    Returns:
      List of integers corresponding to the symbols in the text
  '''
  _symbol_to_id = {s: i for i, s in enumerate(symbols)}

  sequence = []

  clean_text = _clean_text(text, cleaner_names)
  for symbol in clean_text:
    if symbol not in _symbol_to_id.keys():
      continue
    symbol_id = _symbol_to_id[symbol]
    sequence += [symbol_id]
  return sequence


def _clean_text(text, cleaner_names):
  for name in cleaner_names:
    cleaner = getattr(cleaners, name)
    if not cleaner:
      raise Exception('Unknown cleaner: %s' % name)
    text = cleaner(text)
  return text
