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#!/usr/bin/env python
from ply import lex, yacc
class Note():
def __init__(self, value, duration=.25, octave=8):
self.value = value
self.duration = duration
self.octave = octave
self.accidental = None
def __repr__(self):
return "Note %s %s %s" % (self.value, self.duration, self.octave)
class Chord():
def __init__(self, value, duration=.25, chord_type="major"):
def __init__(self, value, duration=.5, chord_type="major"):
self.value = value
self.duration = duration
self.chord_type = chord_type
def __repr__(self):
return "Chord %s %s %s" % (self.value, self.duration, self.chord_type)
class Rest():
def __init__(self, duration=.25):
self.duration = duration
def __repr__(self):
return "Rest node %s" % self.duration
def parse(score):
# Tokenize (lex)
tokens = (
"NOTE_LENGTH",
"BASENOTE",
"ACCIDENTAL",
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# Parse (yacc)
def p_pitch_list(p):
'''score : score note
score : score chord
| score chord
| score rest
'''
p[0] = p[1] + [p[2]]
def p_score(p):
'''score : note
score : chord
| chord
| rest
'''
p[0] = [p[1]]
def p_note(p):
'''note : pitch
'''
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p[0] = new_note
def p_chord(p):
'''chord : QUOTE pitch QUOTE
| QUOTE pitch CHORD_TYPE QUOTE
'''
pitch = p[2].value
pitch = pitch.upper()
p[0] = Chord(value=p[2].value)
p[0] = Chord(value=pitch)
if len(p) > 3:
p[0].chord_type = p[3]
def p_accidental(p):
'''pitch : ACCIDENTAL pitch
'''
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p[0] = p[1]
def p_pitch(p):
'''pitch : BASENOTE
'''
p[0] = Note(p[1])
def p_rest(p):
''' rest : REST
| REST NOTE_LENGTH
'''
p[0] = Rest()
if len(p) > 2:
p[0].duration = p[2]
def p_error(p):
print "Syntax error at '%s' of element type %s" % (p.value, p.type)
yacc.yacc()
#print yacc.parse("GFG B'AB,, | g/2fg gab | GFG BAB | d2A AFD")
return yacc.parse(score)
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