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annotate abcrange.py @ 383:8d574b900e36 build-default-171

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Automated merge with ssh://hg.cryhavoc.org.uk/dottes
author Jim Hague <jim.hague@acm.org>
date Fri, 30 Aug 2013 23:55:28 +0100
parents b4a0161e8870
children 1b79867b4f35
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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)