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# GNU Solfege - free ear training software
# Copyright (C) 2000, 2001, 2002, 2003, 2004, 2006, 2007, 2008, 2011, 2016 Tom Cato Amundsen
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import re
from solfege.mpd import _exceptions
from solfege.mpd import const
from solfege.mpd.duration import Duration
from solfege.mpd.requests import RestRequest, SkipRequest, MusicRequest
from solfege.mpd import elems
from solfege.mpd import MusicalPitch
from solfege.mpd.rat import Rat
class LexerError(_exceptions.MpdException):
def __init__(self, msg, lexer):
_exceptions.MpdException.__init__(self, msg)
self.m_lineno, self.m_linepos1, self.m_linepos2 = lexer.get_error_location()
class Lexer:
STAFF = 1
RHYTHMSTAFF = 2
VOICE = 3
CLEF = 4
STEMDIR = 5
TRANSPOSE = 6
TIME = 7
PARTIAL = 8
KEY = 9
NOTE = 10
SKIP = 11
REST = 12
RELATIVE = 13
TIMES = 14
TUPLETDIR = 15
re_staff = re.compile(r"\\staff", re.UNICODE)
re_rhythmstaff = re.compile(r"\\rhythmstaff", re.UNICODE)
re_voice = re.compile(r"\\addvoice", re.UNICODE)
re_clef = re.compile(r"\\clef\s+(\w*)", re.UNICODE)
re_clef_quoted = re.compile(r"\\clef\s+\"([A-Za-z1-9]+[_^1-9]*)\"", re.UNICODE)
re_stem_updown = re.compile(r"(\\stem)(Up|Down|Both)\s+", re.UNICODE)
re_tuplet_updown = re.compile(r"(\\tuplet)(Up|Down|Both)\s+", re.UNICODE)
re_relative = re.compile(r"\\relative\s+(([a-zA-Z]+)([',]*))", re.UNICODE)
re_transpose = re.compile(r"\\transpose\s+(([a-zA-Z]+)([',]*))", re.UNICODE)
re_rest = re.compile(r"(r)([\d]*)(\.*)", re.UNICODE)
# FIXME we are a little more strict than Lilypond, since ~ has to
# be before ]
# FIXME don't use named regex if we don't need it.
re_melodic = re.compile(r"""(?x)
((?P<notename>[a-zA-Z]+)
(?P<octave>[',]*))
(?P<len>[\d]*)
(?P<dots>\.*)""", re.UNICODE)
re_skip = re.compile(r"""(?x)
(s)
(?P<len>[\d]*)
(?P<dots>\.*)""", re.UNICODE)
re_time = re.compile(r"\\time\s+(\d+)\s*/\s*(\d+)", re.UNICODE)
re_partial = re.compile(r"\\partial\s+(?P<len>[\d]+)(?P<dots>\.*)", re.UNICODE)
re_key = re.compile(r"\\key\s+([a-z]+)\s*\\(major|minor)", re.UNICODE)
re_times = re.compile(r"\\times\s+(\d+)\s*/\s*(\d+)\s*{", re.UNICODE)
def __init__(self, s):
if not isinstance(s, str):
s = s.decode("utf-8")
assert isinstance(s, str)
self.m_string = s
self.m_notelen = Duration(4, 0)
self.m_idx = 0
self.m_last_idx = None
def __iter__(self):
return self
@staticmethod
def to_string(v):
ret = []
for toc, toc_data in v:
if toc == Lexer.STAFF:
ret.append(r"\staff")
elif toc == Lexer.RHYTHMSTAFF:
ret.append(r"\rhythmstaff")
elif toc == Lexer.VOICE:
ret.append(r"\addvoice")
elif toc == Lexer.CLEF:
ret.append(r"\clef %s " % toc_data)
elif toc == Lexer.STEMDIR:
ret.append(r"\stem%s " % {const.UP: 'Up',
const.DOWN: 'Down',
const.BOTH: 'Both'}[toc_data])
elif toc == Lexer.TRANSPOSE:
ret.append(r"\transpose %s" % toc_data.get_octave_notename())
elif toc == Lexer.TIME:
ret.append(r"\time %i/%i " % (toc_data.m_num, toc_data.m_den))
elif toc == Lexer.PARTIAL:
ret.append(r"\partial %s " % toc_data.as_mpd_string())
elif toc == Lexer.KEY:
ret.append(r"\key %s \%s " % toc_data)
elif toc == Lexer.NOTE:
ret.append("%s%s " % (toc_data.m_pitch.get_octave_notename(),
toc_data.m_duration.as_mpd_string() if toc_data.m_duration else ""))
elif toc == Lexer.SKIP:
ret.append("s%s " % (toc_data.m_duration.as_mpd_string() if toc_data.m_duration else "",))
elif toc == Lexer.REST:
ret.append("r%s " % (toc_data.m_duration.as_mpd_string() if toc_data.m_duration else "",))
elif toc == Lexer.RELATIVE:
ret.append(r"\relative %s" % toc_data.get_octave_notename())
elif toc == Lexer.TIMES:
ret.append(r"\times %i/%i{ " % (toc_data.m_num, toc_data.m_den))
elif toc == Lexer.TUPLETDIR:
ret.append(r"\tuplet%s " % {const.UP: 'Up',
const.DOWN: 'Down',
const.BOTH: 'Both'}[toc_data])
else:
ret.append("%s " % toc)
return "".join(ret).strip()
def __next__(self):
try:
return self._next()
except _exceptions.MpdException as e:
if 'm_mpd_badcode' not in dir(e):
e.m_lineno, e.m_linepos1, e.m_linepos2 = self.get_error_location()
raise
def _next(self):
# Doing this while loop inside the exception clause is a little
# faster than using a regular expression.
try:
while self.m_string[self.m_idx] in (' ', '\n', '\t'):
self.m_idx += 1
except IndexError:
raise StopIteration
self.m_last_idx = self.m_idx
m = self.re_rest.match(self.m_string, self.m_idx)
if m:
self.m_idx = m.end()
resttype, notelen, dots = m.groups()
numdots = len(dots)
if notelen:
notelen = int(notelen)
else:
notelen = 0
if numdots:
raise LexerError('Need a digit before dots. Write "%(goodcode)s", not "%(badcode)s".' % {
'badcode': m.group().strip(),
'goodcode': '%s%i%s' % (resttype, self.m_notelen.m_nh, dots)
},
self)
if notelen == 0:
return self.REST, RestRequest(None, None)
else:
self.m_notelen = Duration(notelen, numdots)
return self.REST, RestRequest(notelen, numdots)
m = self.re_skip.match(self.m_string, self.m_idx)
if m:
self.m_idx = m.end()
IGN1, skiplen, dots = m.groups()
numdots = len(dots)
if skiplen:
skiplen = int(skiplen)
self.m_notelen = Duration(skiplen, numdots)
else:
skiplen = 0
if numdots:
raise LexerError('Need a digit before dots. Write "%(goodcode)s", not "%(badcode)s".' % {
'badcode': m.group().strip(),
'goodcode': 's%i%s' % (self.m_notelen.m_nh, dots)
}, self)
if skiplen == 0:
return self.SKIP, SkipRequest(skiplen, numdots)
else:
self.m_notelen = Duration(skiplen, numdots)
return self.SKIP, SkipRequest(skiplen, numdots)
m = self.re_partial.match(self.m_string, self.m_idx)
if m:
self.m_idx = m.end()
num, dot = m.groups()
num = int(num)
dot = len(dot)
return self.PARTIAL, Duration(num, dot)
m = self.re_melodic.match(self.m_string, self.m_idx)
if m:
self.m_idx = m.end()
notename, IGN1, IGN2, notelen, dots = m.groups()
numdots = len(dots)
if notelen:
notelen = int(notelen)
self.m_notelen = Duration(notelen, numdots)
else:
notelen = 0
if dots:
raise LexerError('Need a digit before dots. Write "%(goodcode)s", not "%(badcode)s".' % {
'badcode': m.group().strip(),
'goodcode': '%s%i%s' % (notename, self.m_notelen.m_nh, dots)
}, self)
n = MusicRequest(notename, notelen, numdots)
return self.NOTE, n
m = self.re_staff.match(self.m_string, self.m_idx)
if m:
self.m_idx = m.end()
return self.STAFF, None
m = self.re_rhythmstaff.match(self.m_string, self.m_idx)
if m:
self.m_idx = m.end()
return self.RHYTHMSTAFF, None
m = self.re_voice.match(self.m_string, self.m_idx)
if m:
self.m_idx = m.end()
return self.VOICE, None
m = self.re_relative.match(self.m_string, self.m_idx)
if m:
self.m_idx = m.end()
return self.RELATIVE, MusicalPitch.new_from_notename(m.group(1))
m = self.re_clef_quoted.match(self.m_string, self.m_idx)
if m:
self.m_idx = m.end()
return self.CLEF, m.group(1)
m = self.re_clef.match(self.m_string, self.m_idx)
if m:
self.m_idx = m.end()
return self.CLEF, m.group(1)
m = self.re_stem_updown.match(self.m_string, self.m_idx)
if m:
self.m_idx = m.end()
d = [const.UP, const.DOWN, const.BOTH][['Up', 'Down', 'Both'].index(m.group(2))]
return self.STEMDIR, d
m = self.re_tuplet_updown.match(self.m_string, self.m_idx)
if m:
self.m_idx = m.end()
d = [const.UP, const.DOWN, const.BOTH][['Up', 'Down', 'Both'].index(m.group(2))]
return self.TUPLETDIR, d
m = self.re_transpose.match(self.m_string, self.m_idx)
if m:
self.m_idx = m.end()
return self.TRANSPOSE, MusicalPitch.new_from_notename(m.group(1))
m = self.re_time.match(self.m_string, self.m_idx)
if m:
self.m_idx = m.end()
return self.TIME, elems.TimeSignature(int(m.group(1)), int(m.group(2)))
m = self.re_key.match(self.m_string, self.m_idx)
if m:
self.m_idx = m.end()
return self.KEY, (m.group(1), m.group(2))
m = self.re_times.match(self.m_string, self.m_idx)
if m:
self.m_idx = m.end()
return self.TIMES, Rat(int(m.groups()[0]), int(m.groups()[1]))
if self.m_idx == len(self.m_string):
raise StopIteration
self.m_idx += 1
return self.m_string[self.m_idx - 1], None
def get_error_location(self):
"""
Return a tuple
(lineno, pos1, pos2)
lineno is the 0-index line where the error occoured.
string[pos1:pos2] will return the exact text that caused the error.
"""
# Let us first count lines to find which line we are on.
# line numbers are 0-indexed
lineno = self.m_string[:self.m_last_idx].count("\n")
line_start = self.m_last_idx
while line_start > 0 and self.m_string[line_start] != "\n":
line_start -= 1
if self.m_string[line_start] == "\n":
line_start += 1
line_end = line_start
while line_end < len(self.m_string) and self.m_string[line_end] != '\n':
line_end += 1
return (lineno, self.m_last_idx - line_start, self.m_idx - line_start)
def set_first_pitch(self, pitch):
"""
Modify the first pitch of the music.
"""
assert isinstance(pitch, MusicalPitch)
for toc, toc_data in self:
if toc == Lexer.NOTE:
self.m_string = self.m_string[:self.m_last_idx] + "%s%s" % (pitch.get_octave_notename(), toc_data.m_duration.as_mpd_string() if toc_data.m_duration else "") + self.m_string[self.m_idx:]
break
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