Function parse_string

mingus/core/progressions.py:215–239

Return a tuple (roman numeral, accidentals, chord suffix). Examples: >>> parse_string('I') ('I', 0, '') >>> parse_string('bIM7') ('I', -1, 'M7')

(progression)

def parse_string(progression):
    """Return a tuple (roman numeral, accidentals, chord suffix).

    Examples:
    >>> parse_string('I')
    ('I', 0, '')
    >>> parse_string('bIM7')
    ('I', -1, 'M7')
    """
    acc = 0
    roman_numeral = ""
    suffix = ""
    i = 0
    for c in progression:
        if c == "#":
            acc += 1
        elif c == "b":
            acc -= 1
        elif c.upper() == "I" or c.upper() == "V":
            roman_numeral += c.upper()
        else:
            break
        i += 1
    suffix = progression[i:]
    return (roman_numeral, acc, suffix)


def tuple_to_string(prog_tuple):