1 #!/usr/bin/env python 1 #!/usr/bin/env python 2 2 3 from ply import lex, yacc 3 from ply import lex, yacc 4 4 > 5 # Tokenize (lex) 5 tokens = ( 6 tokens = ( > 7 "NOTE_LENGTH", 6 "NOTE", | 8 "BASENOTE", > 9 "ACCIDENTAL", 7 "REST", 10 "REST", 8 "SHARP", < 9 "FLAT", < 10 "OCTAVE", 11 "OCTAVE", 11 "NATURAL", < 12 "LENGTH", | 12 "CHORD_TYPE", 13 ) 13 ) 14 14 15 t_NOTE = r"[A-Ga-g]" | 15 t_BASENOTE = r"[A-Ga-g]" > 16 t_ACCIDENTAL = r"\^{1,2}|_{1,2}|=" 16 t_REST = r"z" 17 t_REST = r"z" 17 t_SHARP = r"\^" < 18 t_FLAT = r"_" < 19 t_NATURAL = r"=" < 20 t_OCTAVE = r"'+|,+" 18 t_OCTAVE = r"'+|,+" > 19 t_CHORD_TYPE = r"m|7|m7|0|o|\+|mb5|sus|sus4|maj7|mmaj7|7sus4|dim|dim7|7b5|m7b5|6 21 20 22 def t_LENGTH(t): | 21 def t_NOTE_LENGTH(t): 23 r"/?\d+" 22 r"/?\d+" 24 multiplier = float(t.value.strip("/")) 23 multiplier = float(t.value.strip("/")) 25 if t.value.startswith("/"): 24 if t.value.startswith("/"): 26 multiplier = 1/multiplier 25 multiplier = 1/multiplier 27 t.value = multiplier 26 t.value = multiplier 28 return t 27 return t 29 28 ................................................................................................................................................................................ 30 def t_error(t): 29 def t_error(t): 31 raise TypeError("Unknown text '%s'" % (t.value,)) 30 raise TypeError("Unknown text '%s'" % (t.value,)) 32 31 33 t_ignore = " |" 32 t_ignore = " |" 34 33 35 lex.lex() 34 lex.lex() 36 35 37 lex.input("GFG B'AB,, | g/2fg gab | GFG BAB | d2A AFD") | 36 #lex.input("GFG B'AB,, | g/2fg gab | GFG BAB | d2A AFD") > 37 #s = "GFG B'AB,, | g/2fg gab | GFG BAB | d2A AFD" > 38 s = "GF_G," > 39 lex.input(s) 38 for tok in iter(lex.token, None): 40 for tok in iter(lex.token, None): 39 print repr(tok.type), repr(tok.value) 41 print repr(tok.type), repr(tok.value) > 42 > 43 > 44 # Parse (yacc) > 45 > 46 class Note(object): > 47 def __init__(self, value, duration=.25, octave=8): > 48 self.value = value > 49 self.duration = duration > 50 self.octave = octave > 51 def __repr__(self): > 52 return "Note %s %s %s" % (self.value, self.duration, self.octave) > 53 > 54 #def p_element(p): > 55 # "element : note_element" > 56 # p[0] = p[1] > 57 # > 58 #def p_note_element(p): > 59 # '''note_element : note_element note_stem > 60 # | note_stem > 61 # ''' > 62 # p[0] = p[1] > 63 # > 64 #def p_note_stem(p): > 65 # '''note_stem : note''' > 66 # p[0] = p[1] > 67 # > 68 #def p_note(p): > 69 # '''note : note_or_rest > 70 # | note_or_rest NOTE_LENGTH > 71 # ''' > 72 # p[0] = p[1] > 73 # > 74 #def p_note_or_rest(p): > 75 # '''note_or_rest : pitch > 76 # | REST > 77 # ''' > 78 # p[0] = p[1] > 79 # > 80 #def p_pitch(p): > 81 > 82 def p_pitch_list(p): > 83 '''score : score pitch > 84 ''' > 85 p[0] = p[1] + [p[2]] > 86 > 87 def p_sore(p): > 88 '''score : pitch > 89 ''' > 90 p[0] = [p[1]] > 91 > 92 > 93 def p_pitch_more(p): > 94 ''' score : pitch NOTE_LENGTH > 95 ''' > 96 print "stuff" > 97 new_note = p[1] > 98 new_note.duration = p[2] > 99 p[0] = new_note > 100 > 101 def p_pitch(p): > 102 '''pitch : BASENOTE > 103 ''' > 104 p[0] = Note(p[1]) > 105 > 106 def p_accidental(p): > 107 '''pitch : ACCIDENTAL pitch > 108 ''' > 109 p[2].accidental = p[1] > 110 p[0] = p[2] > 111 > 112 def p_octave(p): > 113 '''pitch : pitch OCTAVE > 114 ''' > 115 count = len(p[2]) > 116 increment_or_decrement = 1 if p[2][0] == "," else -1 > 117 octave = 8 + (count * increment_or_decrement) > 118 p[1].octave = octave > 119 p[0] = p[1] > 120 > 121 def p_error(p): > 122 print "Syntax error at '%s' of element type %s" % (p.value, p.type) > 123 > 124 yacc.yacc() > 125 > 126 #print yacc.parse("GFG B'AB,, | g/2fg gab | GFG BAB | d2A AFD") > 127 print yacc.parse(s)