# spiffyscore

parse.py at [4aeb057ae0]

# parse.py at [4aeb057ae0]

## File parse.py artifact 8130e10658 part of check-in 4aeb057ae0

``````#!/usr/bin/env python

from ply import lex, yacc

# Tokenize (lex)
tokens = (
"NOTE_LENGTH",
"BASENOTE",
"ACCIDENTAL",
"REST",
"OCTAVE",
"CHORD_TYPE",
"QUOTE",
)

t_ignore = " |"

#t_BASENOTE = r"[A-Ga-g]"
t_BASENOTE = r"I+V?|VI*|i+v?|vi*"
t_ACCIDENTAL = r"\^{1,2}|_{1,2}|="
t_REST = r"z"
t_OCTAVE = r"'+|,+"
t_QUOTE = '"'

def t_NOTE_LENGTH(t):
r"/?\d+"
multiplier = float(t.value.strip("/"))
if t.value.startswith("/"):
multiplier = 1/multiplier
t.value = multiplier
return t

def t_error(t):
raise TypeError("Unknown text '%s'" % (t.value,))

lex.lex()

#lex.input("GFG B'AB,, | g/2fg gab | GFG BAB | d2A AFD")
#s = "GFG B'AB,, | g/2fg gab | GFG BAB | d2A AFD"
s = '''I IV V VI I "I" "ii"/2'''
#s = "GF_G,/2"
lex.input(s)
for tok in iter(lex.token, None):
print repr(tok.type), repr(tok.value)

# Parse (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"):
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)

def p_pitch_list(p):
'''score : score note
score : score chord
'''
p[0] = p[1] + [p[2]]

def p_score(p):
'''score : note
score : chord
'''
p[0] = [p[1]]

def p_note(p):
'''note : pitch
'''
p[0] = p[1]

def p_note_length(p):
''' note : note NOTE_LENGTH
'''
new_note = p[1]
new_note.duration = p[2]
p[0] = new_note

def p_chord_length(p):
''' chord : chord NOTE_LENGTH
'''
new_note = p[1]
new_note.duration = p[2]
p[0] = new_note

def p_chord(p):
'''chord : QUOTE pitch QUOTE
| QUOTE pitch CHORD_TYPE QUOTE
'''
p[0] = Chord(value=p[2].value)
if len(p) > 3:
p[0].chord_type = p[3]

def p_accidental(p):
'''pitch : ACCIDENTAL pitch
'''
p[2].accidental = p[1]
p[0] = p[2]

def p_octave(p):
'''pitch : pitch OCTAVE
'''
count = len(p[2])
increment_or_decrement = 1 if p[2][0] == "," else -1
octave = 8 + (count * increment_or_decrement)
p[1].octave = octave
p[0] = p[1]

def p_pitch(p):
'''pitch : BASENOTE
'''
p[0] = Note(p[1])

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")
print yacc.parse(s)
```
```