from synthesizer.utils.symbols import symbols from synthesizer.utils import cleaners import re # Mappings from symbol to numeric ID and vice versa: _symbol_to_id = {s: i for i, s in enumerate(symbols)} _id_to_symbol = {i: s for i, s in enumerate(symbols)} # Regular expression matching text enclosed in curly braces: _curly_re = re.compile(r"(.*?)\{(.+?)\}(.*)") def text_to_sequence(text, cleaner_names): """Converts a string of text to a sequence of IDs corresponding to the symbols in the text. The text can optionally have ARPAbet sequences enclosed in curly braces embedded in it. For example, "Turn left on {HH AW1 S S T AH0 N} Street." 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 """ sequence = [] # Check for curly braces and treat their contents as ARPAbet: while len(text): m = _curly_re.match(text) if not m: sequence += _symbols_to_sequence(_clean_text(text, cleaner_names)) break sequence += _symbols_to_sequence(_clean_text(m.group(1), cleaner_names)) sequence += _arpabet_to_sequence(m.group(2)) text = m.group(3) # Append EOS token sequence.append(_symbol_to_id["~"]) return sequence def sequence_to_text(sequence): """Converts a sequence of IDs back to a string""" result = "" for symbol_id in sequence: if symbol_id in _id_to_symbol: s = _id_to_symbol[symbol_id] # Enclose ARPAbet back in curly braces: if len(s) > 1 and s[0] == "@": s = "{%s}" % s[1:] result += s return result.replace("}{", " ") 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 def _symbols_to_sequence(symbols): return [_symbol_to_id[s] for s in symbols if _should_keep_symbol(s)] def _arpabet_to_sequence(text): return _symbols_to_sequence(["@" + s for s in text.split()]) def _should_keep_symbol(s): return s in _symbol_to_id and s not in ("_", "~")