dottes/abcrange.py

#!/usr/bin/env python3
#
# Find the range of a tune. Do minimal parsing of an ABC input file
# and print the lowest and highest notes therein. Accidentals are
# ignored.
#
# The output is given in purely numeric form, to avoid needing to
# re-parse it in an external script. A single line is printed with
# the highest note followed by a space and the lowest note. Middle C ('C') is
# 100. D an octave above ('d') is 108. D an octave above that ('d'') is
# 205. D below middle C ('d,') is 94. And so on.
#
# For example:
# $./abcrange.py choon.abc
# choon.abc: 112 97
#

import sys

def process(filename, inf):
    highest = 0
    lowest = 1000
    for line in inf:
        line = line.strip()
        # If it is empty or starts "%", ignore it.
        if len(line) == 0 or line[0] == "%":
            continue

        # Is it a header line? I.e. does it start LETTER COLON?
        # If so, ignore.
        start = line[:2]
        if len(start) > 1 and start[1] == ":" and (start[0].isalpha() or start[0] == '+'):
            continue

        # Tune line.
        inchord = False
        note = 0
        notevals = {
            "C": 100,
            "D": 101,
            "E": 102,
            "F": 103,
            "G": 104,
            "A": 105,
            "B": 106,
            "c": 107,
            "d": 108,
            "e": 109,
            "f": 110,
            "g": 111,
            "a": 112,
            "b": 113,
        }
        for c in line:
            if c == "," and note > 0:
                note = note - 7
                continue
            elif c == "'" and note > 0:
                note = note + 7
                continue

            if note > 0:
                if note > highest:
                    highest = note
                if note < lowest:
                    lowest = note
                note = 0

            if c == '"':
                inchord = not inchord
                continue
            if inchord:
                continue

            if c in notevals:
                note = notevals[c]

        if note > 0:
            if note > highest:
                highest = note
            if note < lowest:
                lowest = note
            note = 0

    print("{0}: {1} {2}".format(filename, highest, lowest))

if len(sys.argv) > 1:
    for arg in sys.argv[1:]:
        try:
            inf = open(arg, "r")
            process(arg, inf)
        finally:
            inf.close()
else:
    process("stdin", sys.stdin)