@staticmethod
def ipus(trs):
    """Return the tier with Inter-Pausal Units.

        :param trs: (sppasTranscription)
        :returns: (sppasTier or None)

        """
    for tier in trs:
        tier_name = tier.get_name().lower()
        if 'ipu' in tier_name:
            return tier
    return None

@staticmethod
def transcription(trs):
    """Return the tier with orthographic transcription.

        :param trs: (sppasTranscription)
        :returns: (sppasTier or None)

        """
    tier = trs.find('transcription', case_sensitive=False)
    if tier is not None:
        return tier
    for tier in trs:
        tier_name = tier.get_name().lower()
        if 'transcription' in tier_name:
            return tier
    for tier in trs:
        tier_name = tier.get_name().lower()
        if 'trans' in tier_name:
            return tier
        elif 'trs' in tier_name:
            return tier
        elif 'toe' in tier_name:
            return tier
        elif 'ortho' in tier_name:
            return tier
    return None

@staticmethod
def tokenization(trs, pattern=''):
    """Return the tier with tokenization.

        In case of EOT, several tiers with tokens are available.
        Priority is given to faked (i.e. without pattern).

        :param trs: (sppasTranscription)
        :param pattern: (str) Priority pattern
        :returns: (sppasTier or None)

        """
    if len(pattern) > 0:
        pattern = pattern.lower()
        for tier in trs:
            tier_name = tier.get_name().lower()
            if pattern in tier_name and 'token' in tier_name:
                return tier
    if len(trs) == 1:
        if 'token' in trs[0].get_name().lower():
            return trs[0]
    else:
        tok_tier = None
        std_tier = None
        for tier in trs:
            tier_name = tier.get_name().lower()
            if 'align' in tier_name:
                continue
            if tier_name == 'tokens':
                return tier
            elif 'std' in tier_name and 'token' in tier_name:
                std_tier = tier
            elif 'token' in tier_name:
                tok_tier = tier
        if std_tier is not None:
            return std_tier
        if tok_tier is not None:
            return tok_tier
    return None

@staticmethod
def phonetization(trs):
    """Return the tier with phonetization.

        :param trs: (sppasTranscription)
        :returns: (sppasTier or None)

        """
    tier = trs.find('phones', case_sensitive=False)
    if tier is not None:
        return tier
    for tier in trs:
        tier_name = tier.get_name().lower()
        if 'align' in tier_name:
            continue
        if tier_name.startswith('phon') is True:
            return tier
    for tier in trs:
        tier_name = tier.get_name().lower()
        if 'align' in tier_name:
            continue
        if 'phon' in tier_name:
            return tier
    return None

@staticmethod
def aligned_phones(trs):
    """Return the tier with time-aligned phonemes.

        :param trs: (sppasTier or None)

        """
    for tier in trs:
        if 'align' in tier.get_name().lower() and 'phon' in tier.get_name().lower():
            return tier
    return None

@staticmethod
def aligned_tokens(trs):
    """Return the tier with time-aligned tokens.

        :param trs: (sppasTier or None)

        """
    for tier in trs:
        if 'align' in tier.get_name().lower() and 'token' in tier.get_name().lower():
            return tier
    return None

@staticmethod
def aligned_syllables(trs):
    """Return the tier with time-aligned syllables.

        :param trs: (sppasTier or None)

        """
    for tier in trs:
        if 'align' in tier.get_name().lower() and 'syll' in tier.get_name().lower():
            return tier
    for tier in trs:
        if tier.get_name() == 'Syllables':
            return tier
    for tier in trs:
        if 'Syll' in tier.get_name():
            return tier
    return None

@staticmethod
def aligned_lemmas(trs):
    """Return the tier with time-aligned lemmas.

        :param trs: (sppasTier or None)

        """
    for tier in trs:
        if 'lemma' in tier.get_name().lower():
            return tier
    return None

@staticmethod
def pitch(trs):
    """Return the tier with pitch values.

        :param trs: (sppasTranscription)
        :returns: (sppasTier or None)

        """
    for tier in trs:
        if tier.get_name() == 'PitchHz':
            return tier
    for tier in trs:
        if tier.get_name() == 'PitchTier':
            return tier
    for tier in trs:
        if 'pitch' in tier.get_name().lower():
            return tier
    return None

@staticmethod
def pitch_anchors(trs):
    """Return the tier with pitch anchors, like momel result.

        :param trs: (sppasTranscription)
        :returns: (sppasTier or None)

        """
    for tier in trs:
        if 'momel' in tier.get_name().lower():
            return tier
    for tier in trs:
        if 'anchors' in tier.get_name().lower():
            return tier
    return None