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annotate abcrange.py @ 510:0a75c953c3c8 build-default-216

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Add the Pugwash theme, aka the Trumpet Hornpipe. I've checked this against YouTube and the first episode, and corrected an obvious wrong note in Paul Hardy's version. But I've kept his descending triplets in the last line of the B tune - the original has the same note, with descending chords, but changing the triplets to remain on G doesn't sound right.
author Jim Hague <jim.hague@acm.org>
date Fri, 01 Aug 2014 23:41:42 +0100
parents b4a0161e8870
children 1b79867b4f35
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b4a0161e8870 Add abcrange.py to return the range of a tune, and use it in instrument transposition.
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1 #!/usr/bin/env python
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2 #
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3 # Find the range of a tune. Do minimal parsing of an ABC input file
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4 # and print the lowest and highest notes therein. Accidentals are
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5 # ignored.
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6 #
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7 # The output is given in purely numeric form, to avoid needing to
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8 # re-parse it in an external script. A single line is printed with
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9 # the highest note followed by a space and the lowest note. Middle C ('C') is
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10 # 100. D an octave about ('d') is 108. D an octave above that ('d'') is
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11 # 205. D below middle C ('d,') is 94. And so on.
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12 #
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13 # For example:
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14 # $./abcrange.py choon.abc
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15 # choon.abc: 112 97
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16 #
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17
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18 import sys
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19
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20 def process(filename, inf):
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21 highest = 0
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22 lowest = 1000
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23 for line in inf:
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24 line = line.strip()
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25 # If it is empty or starts "%", ignore it.
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26 if len(line) == 0 or line[0] == "%":
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27 continue
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28
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29 # Is it a header line? I.e. does it start LETTER COLON?
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30 # If so, ignore.
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31 start = line[:2]
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32 if len(start) > 1 and start[1] == ":" and start[0].isalpha():
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33 continue
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34
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35 # Tune line.
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36 inchord = False
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37 note = 0
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38 notevals = {
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39 "C": 100,
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40 "D": 101,
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41 "E": 102,
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42 "F": 103,
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43 "G": 104,
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44 "A": 105,
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45 "B": 106,
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46 "c": 107,
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47 "d": 108,
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48 "e": 109,
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49 "f": 110,
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50 "g": 111,
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51 "a": 112,
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52 "b": 113,
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53 }
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54 for c in line:
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55 if c == "," and note > 0:
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56 note = note - 7
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57 continue
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58 elif c == "'" and note > 0:
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59 note = note + 7
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60 continue
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61
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62 if note > 0:
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63 if note > highest:
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64 highest = note
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65 if note < lowest:
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66 lowest = note
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67 note = 0
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68
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69 if c == '"':
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70 inchord = not inchord
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71 continue
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72 if inchord:
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73 continue
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74
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75 if c in notevals:
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76 note = notevals[c]
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77
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78 if note > 0:
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79 if note > highest:
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80 highest = note
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81 if note < lowest:
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82 lowest = note
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83 note = 0
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84
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85 print "{0}: {1} {2}".format(filename, highest, lowest)
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86
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87 if len(sys.argv) > 1:
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88 for arg in sys.argv[1:]:
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89 try:
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90 inf = open(arg, "r")
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91 process(arg, inf)
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92 finally:
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93 inf.close()
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94 else:
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95 process("stdin", sys.stdin)