python/musicxml.py

   1 # -*- coding: utf-8 -*-
   2 import new
   3 import string
   4 from rational import *
   5 import re
   6 import sys
   7 import copy
   8 import lilylib as ly
   9
  10 _ = ly._
  11
  12 def error (str):
  13     ly.stderr_write ((_ ("error: %s") % str) + "\n")
  14
  15
  16 def escape_ly_output_string (input_string):
  17     return_string = input_string
  18     needs_quotes = not re.match (u"^[a-zA-ZäöüÜÄÖßñ]*$", return_string);
  19     if needs_quotes:
  20         return_string = "\"" + string.replace (return_string, "\"", "\\\"") + "\""
  21     return return_string
  22
  23
  24 def musicxml_duration_to_log (dur):
  25     return  {'256th': 8,
  26              '128th': 7,
  27              '64th': 6,
  28              '32nd': 5,
  29              '16th': 4,
  30              'eighth': 3,
  31              'quarter': 2,
  32              'half': 1,
  33              'whole': 0,
  34              'breve': -1,
  35              'longa': -2,
  36              'long': -2}.get (dur, 0)
  37
  38
  39
  40 class Xml_node:
  41     def __init__ (self):
  42         self._children = []
  43         self._data = None
  44         self._original = None
  45         self._name = 'xml_node'
  46         self._parent = None
  47         self._attribute_dict = {}
  48
  49     def get_parent (self):
  50         return self._parent
  51
  52     def is_first (self):
  53         return self._parent.get_typed_children (self.__class__)[0] == self
  54
  55     def original (self):
  56         return self._original
  57     def get_name (self):
  58         return self._name
  59
  60     def get_text (self):
  61         if self._data:
  62             return self._data
  63
  64         if not self._children:
  65             return ''
  66
  67         return ''.join ([c.get_text () for c in self._children])
  68
  69     def message (self, msg):
  70         ly.stderr_write (msg+'\n')
  71
  72         p = self
  73         while p:
  74             sys.stderr.write ('  In: <%s %s>\n' % (p._name, ' '.join (['%s=%s' % item for item in p._attribute_dict.items ()])))
  75             p = p.get_parent ()
  76
  77     def get_typed_children (self, klass):
  78         if not klass:
  79             return []
  80         else:
  81             return [c for c in self._children if isinstance(c, klass)]
  82
  83     def get_named_children (self, nm):
  84         return self.get_typed_children (get_class (nm))
  85
  86     def get_named_child (self, nm):
  87         return self.get_maybe_exist_named_child (nm)
  88
  89     def get_children (self, predicate):
  90         return [c for c in self._children if predicate(c)]
  91
  92     def get_all_children (self):
  93         return self._children
  94
  95     def get_maybe_exist_named_child (self, name):
  96         return self.get_maybe_exist_typed_child (get_class (name))
  97
  98     def get_maybe_exist_typed_child (self, klass):
  99         cn = self.get_typed_children (klass)
 100         if len (cn)==0:
 101             return None
 102         elif len (cn) == 1:
 103             return cn[0]
 104         else:
 105             raise "More than 1 child", klass
 106
 107     def get_unique_typed_child (self, klass):
 108         cn = self.get_typed_children(klass)
 109         if len (cn) <> 1:
 110             sys.stderr.write (self.__dict__ + '\n')
 111             raise 'Child is not unique for', (klass, 'found', cn)
 112
 113         return cn[0]
 114
 115     def get_named_child_value_number (self, name, default):
 116         n = self.get_maybe_exist_named_child (name)
 117         if n:
 118             return string.atoi (n.get_text())
 119         else:
 120             return default
 121
 122
 123 class Music_xml_node (Xml_node):
 124     def __init__ (self):
 125         Xml_node.__init__ (self)
 126         self.duration = Rational (0)
 127         self.start = Rational (0)
 128
 129 class Work (Xml_node):
 130     def get_work_information (self, tag):
 131         wt = self.get_maybe_exist_named_child (tag)
 132         if wt:
 133             return wt.get_text ()
 134         else:
 135             return ''
 136
 137     def get_work_title (self):
 138         return self.get_work_information ('work-title')
 139     def get_work_number (self):
 140         return self.get_work_information ('work-number')
 141     def get_opus (self):
 142         return self.get_work_information ('opus')
 143
 144 class Identification (Xml_node):
 145     def get_rights (self):
 146         rights = self.get_maybe_exist_named_child ('rights')
 147         if rights:
 148             return rights.get_text ()
 149         else:
 150             return ''
 151
 152     def get_creator (self, type):
 153         creators = self.get_named_children ('creator')
 154         # return the first creator tag that has the particular type
 155         for i in creators:
 156             if hasattr (i, 'type') and i.type == type:
 157                 return i.get_text ()
 158         return None
 159
 160     def get_composer (self):
 161         c = self.get_creator ('composer')
 162         if c:
 163             return c
 164         creators = self.get_named_children ('creator')
 165         # return the first creator tag that has no type at all
 166         for i in creators:
 167             if not hasattr (i, 'type'):
 168                 return i.get_text ()
 169         return None
 170     def get_arranger (self):
 171         return self.get_creator ('arranger')
 172     def get_editor (self):
 173         return self.get_creator ('editor')
 174     def get_poet (self):
 175         v = self.get_creator ('lyricist')
 176         if v:
 177             return v
 178         v = self.get_creator ('poet')
 179         return v
 180
 181     def get_encoding_information (self, type):
 182         enc = self.get_named_children ('encoding')
 183         if enc:
 184             children = enc[0].get_named_children (type)
 185             if children:
 186                 return children[0].get_text ()
 187         else:
 188             return None
 189
 190     def get_encoding_software (self):
 191         return self.get_encoding_information ('software')
 192     def get_encoding_date (self):
 193         return self.get_encoding_information ('encoding-date')
 194     def get_encoding_person (self):
 195         return self.get_encoding_information ('encoder')
 196     def get_encoding_description (self):
 197         return self.get_encoding_information ('encoding-description')
 198
 199     def get_encoding_software_list (self):
 200         enc = self.get_named_children ('encoding')
 201         software = []
 202         for e in enc:
 203             softwares = e.get_named_children ('software')
 204             for s in softwares:
 205                 software.append (s.get_text ())
 206         return software
 207
 208     def get_file_description (self):
 209         misc = self.get_named_children ('miscellaneous')
 210         for m in misc:
 211             misc_fields = m.get_named_children ('miscellaneous-field')
 212             for mf in misc_fields:
 213                 if hasattr (mf, 'name') and mf.name == 'description':
 214                     return mf.get_text ()
 215         return None
 216
 217
 218
 219 class Duration (Music_xml_node):
 220     def get_length (self):
 221         dur = int (self.get_text ()) * Rational (1,4)
 222         return dur
 223
 224 class Hash_comment (Music_xml_node):
 225     pass
 226 class Hash_text (Music_xml_node):
 227     pass
 228
 229 class Pitch (Music_xml_node):
 230     def get_step (self):
 231         ch = self.get_unique_typed_child (get_class (u'step'))
 232         step = ch.get_text ().strip ()
 233         return step
 234     def get_octave (self):
 235         ch = self.get_unique_typed_child (get_class (u'octave'))
 236
 237         step = ch.get_text ().strip ()
 238         return int (step)
 239
 240     def get_alteration (self):
 241         ch = self.get_maybe_exist_typed_child (get_class (u'alter'))
 242         alter = 0
 243         if ch:
 244             alter = int (ch.get_text ().strip ())
 245         return alter
 246
 247 class Unpitched (Music_xml_node):
 248     def get_step (self):
 249         ch = self.get_unique_typed_child (get_class (u'display-step'))
 250         step = ch.get_text ().strip ()
 251         return step
 252
 253     def get_octave (self):
 254         ch = self.get_unique_typed_child (get_class (u'display-octave'))
 255
 256         if ch:
 257             octave = ch.get_text ().strip ()
 258             return int (octave)
 259         else:
 260             return None
 261
 262 class Measure_element (Music_xml_node):
 263     def get_voice_id (self):
 264         voice_id = self.get_maybe_exist_named_child ('voice')
 265         if voice_id:
 266             return voice_id.get_text ()
 267         else:
 268             return None
 269
 270     def is_first (self):
 271         # Look at all measure elements (previously we had self.__class__, which
 272         # only looked at objects of the same type!
 273         cn = self._parent.get_typed_children (Measure_element)
 274         # But only look at the correct voice; But include Attributes, too, which
 275         # are not tied to any particular voice
 276         cn = [c for c in cn if (c.get_voice_id () == self.get_voice_id ()) or isinstance (c, Attributes)]
 277         return cn[0] == self
 278
 279 class Attributes (Measure_element):
 280     def __init__ (self):
 281         Measure_element.__init__ (self)
 282         self._dict = {}
 283         self._original_tag = None
 284
 285     def is_first (self):
 286         cn = self._parent.get_typed_children (self.__class__)
 287         if self._original_tag:
 288             return cn[0] == self._original_tag
 289         else:
 290             return cn[0] == self
 291
 292     def set_attributes_from_previous (self, dict):
 293         self._dict.update (dict)
 294
 295     def read_self (self):
 296         for c in self.get_all_children ():
 297             self._dict[c.get_name()] = c
 298
 299     def get_named_attribute (self, name):
 300         return self._dict.get (name)
 301
 302     def get_measure_length (self):
 303         (n,d) = self.get_time_signature ()
 304         return Rational (n,d)
 305
 306     def get_time_signature (self):
 307         "return time sig as a (beat, beat-type) tuple"
 308
 309         try:
 310             mxl = self.get_named_attribute ('time')
 311             if mxl:
 312                 beats = mxl.get_maybe_exist_named_child ('beats')
 313                 type = mxl.get_maybe_exist_named_child ('beat-type')
 314                 return (int (beats.get_text ()),
 315                         int (type.get_text ()))
 316             else:
 317                 return (4, 4)
 318         except KeyError:
 319             error (_ ("requested time signature, but time sig is unknown"))
 320             return (4, 4)
 321
 322     # returns clef information in the form ("cleftype", position, octave-shift)
 323     def get_clef_information (self):
 324         clefinfo = ['G', 2, 0]
 325         mxl = self.get_named_attribute ('clef')
 326         if not mxl:
 327             return clefinfo
 328         sign = mxl.get_maybe_exist_named_child ('sign')
 329         if sign:
 330             clefinfo[0] = sign.get_text()
 331         line = mxl.get_maybe_exist_named_child ('line')
 332         if line:
 333             clefinfo[1] = string.atoi (line.get_text ())
 334         octave = mxl.get_maybe_exist_named_child ('clef-octave-change')
 335         if octave:
 336             clefinfo[2] = string.atoi (octave.get_text ())
 337         return clefinfo
 338
 339     def get_key_signature (self):
 340         "return (fifths, mode) tuple"
 341
 342         key = self.get_named_attribute ('key')
 343         mode_node = key.get_maybe_exist_named_child ('mode')
 344         mode = 'major'
 345         if mode_node:
 346             mode = mode_node.get_text ()
 347
 348         fifths = int (key.get_maybe_exist_named_child ('fifths').get_text ())
 349         return (fifths, mode)
 350
 351 class Barline (Measure_element):
 352     pass
 353 class BarStyle (Music_xml_node):
 354     pass
 355 class Partial (Measure_element):
 356     def __init__ (self, partial):
 357         Measure_element.__init__ (self)
 358         self.partial = partial
 359
 360 class Note (Measure_element):
 361     def __init__ (self):
 362         Measure_element.__init__ (self)
 363         self.instrument_name = ''
 364         self._after_grace = False
 365     def is_grace (self):
 366         return self.get_maybe_exist_named_child (u'grace')
 367     def is_after_grace (self):
 368         if not self.is_grace():
 369             return False;
 370         gr = self.get_maybe_exist_typed_child (Grace)
 371         return self._after_grace or hasattr (gr, 'steal-time-previous');
 372
 373     def get_duration_log (self):
 374         ch = self.get_maybe_exist_named_child (u'type')
 375
 376         if ch:
 377             log = ch.get_text ().strip()
 378             return musicxml_duration_to_log (log)
 379         elif self.get_maybe_exist_named_child (u'grace'):
 380             # FIXME: is it ok to default to eight note for grace notes?
 381             return 3
 382         else:
 383             self.message (_ ("Encountered note at %s with %s duration (no <type> element):") % (self.start, self.duration) )
 384             return 0
 385
 386     def get_factor (self):
 387         return 1
 388
 389     def get_pitches (self):
 390         return self.get_typed_children (get_class (u'pitch'))
 391
 392 class Part_list (Music_xml_node):
 393     def __init__ (self):
 394         Music_xml_node.__init__ (self)
 395         self._id_instrument_name_dict = {}
 396
 397     def generate_id_instrument_dict (self):
 398
 399         ## not empty to make sure this happens only once.
 400         mapping = {1: 1}
 401         for score_part in self.get_named_children ('score-part'):
 402             for instr in score_part.get_named_children ('score-instrument'):
 403                 id = instr.id
 404                 name = instr.get_named_child ("instrument-name")
 405                 mapping[id] = name.get_text ()
 406
 407         self._id_instrument_name_dict = mapping
 408
 409     def get_instrument (self, id):
 410         if not self._id_instrument_name_dict:
 411             self.generate_id_instrument_dict()
 412
 413         instrument_name = self._id_instrument_name_dict.get (id)
 414         if instrument_name:
 415             return instrument_name
 416         else:
 417             ly.stderr_write (_ ("Unable to find instrument for ID=%s\n") % id)
 418             return "Grand Piano"
 419
 420 class Part_group (Music_xml_node):
 421     pass
 422 class Score_part (Music_xml_node):
 423     pass
 424
 425 class Measure (Music_xml_node):
 426     def __init__ (self):
 427         Music_xml_node.__init__ (self)
 428         self.partial = 0
 429     def is_implicit (self):
 430         return hasattr (self, 'implicit') and self.implicit == 'yes'
 431     def get_notes (self):
 432         return self.get_typed_children (get_class (u'note'))
 433
 434 class Syllabic (Music_xml_node):
 435     def continued (self):
 436         text = self.get_text()
 437         return (text == "begin") or (text == "middle")
 438 class Text (Music_xml_node):
 439     pass
 440
 441 class Lyric (Music_xml_node):
 442     def get_number (self):
 443         if hasattr (self, 'number'):
 444             return self.number
 445         else:
 446             return -1
 447
 448     def lyric_to_text (self):
 449         continued = False
 450         syllabic = self.get_maybe_exist_typed_child (Syllabic)
 451         if syllabic:
 452             continued = syllabic.continued ()
 453         text = self.get_maybe_exist_typed_child (Text)
 454
 455         if text:
 456             text = text.get_text()
 457             # We need to convert soft hyphens to -, otherwise the ascii codec as well
 458             # as lilypond will barf on that character
 459             text = string.replace( text, u'\xad', '-' )
 460
 461         if text == "-" and continued:
 462             return "--"
 463         elif text == "_" and continued:
 464             return "__"
 465         elif continued and text:
 466             return escape_ly_output_string (text) + " --"
 467         elif continued:
 468             return "--"
 469         elif text:
 470             return escape_ly_output_string (text)
 471         else:
 472             return ""
 473
 474 class Musicxml_voice:
 475     def __init__ (self):
 476         self._elements = []
 477         self._staves = {}
 478         self._start_staff = None
 479         self._lyrics = []
 480         self._has_lyrics = False
 481
 482     def add_element (self, e):
 483         self._elements.append (e)
 484         if (isinstance (e, Note)
 485             and e.get_maybe_exist_typed_child (Staff)):
 486             name = e.get_maybe_exist_typed_child (Staff).get_text ()
 487
 488             if not self._start_staff and not e.get_maybe_exist_typed_child (Grace):
 489                 self._start_staff = name
 490             self._staves[name] = True
 491
 492         lyrics = e.get_typed_children (Lyric)
 493         if not self._has_lyrics:
 494           self.has_lyrics = len (lyrics) > 0
 495
 496         for l in lyrics:
 497             nr = l.get_number()
 498             if (nr > 0) and not (nr in self._lyrics):
 499                 self._lyrics.append (nr)
 500
 501     def insert (self, idx, e):
 502         self._elements.insert (idx, e)
 503
 504     def get_lyrics_numbers (self):
 505         if (len (self._lyrics) == 0) and self._has_lyrics:
 506             #only happens if none of the <lyric> tags has a number attribute
 507             return [1]
 508         else:
 509             return self._lyrics
 510
 511
 512 class Part (Music_xml_node):
 513     def __init__ (self):
 514         Music_xml_node.__init__ (self)
 515         self._voices = {}
 516         self._staff_attributes_dict = {}
 517
 518     def get_part_list (self):
 519         n = self
 520         while n and n.get_name() != 'score-partwise':
 521             n = n._parent
 522
 523         return n.get_named_child ('part-list')
 524
 525     def interpret (self):
 526         """Set durations and starting points."""
 527         """The starting point of the very first note is 0!"""
 528
 529         part_list = self.get_part_list ()
 530
 531         now = Rational (0)
 532         factor = Rational (1)
 533         attributes_dict = {}
 534         attributes_object = None
 535         measures = self.get_typed_children (Measure)
 536         last_moment = Rational (-1)
 537         last_measure_position = Rational (-1)
 538         measure_position = Rational (0)
 539         measure_start_moment = now
 540         is_first_measure = True
 541         previous_measure = None
 542         # Graces at the end of a measure need to have their position set to the
 543         # previous number!
 544         pending_graces = []
 545         for m in measures:
 546             # implicit measures are used for artificial measures, e.g. when
 547             # a repeat bar line splits a bar into two halves. In this case,
 548             # don't reset the measure position to 0. They are also used for
 549             # upbeats (initial value of 0 fits these, too).
 550             # Also, don't reset the measure position at the end of the loop,
 551             # but rather when starting the next measure (since only then do we
 552             # know if the next measure is implicit and continues that measure)
 553             if not m.is_implicit ():
 554                 # Warn about possibly overfull measures and reset the position
 555                 if attributes_object and previous_measure and previous_measure.partial == 0:
 556                     length = attributes_object.get_measure_length ()
 557                     new_now = measure_start_moment + length
 558                     if now <> new_now:
 559                         problem = 'incomplete'
 560                         if now > new_now:
 561                             problem = 'overfull'
 562                         ## only for verbose operation.
 563                         if problem <> 'incomplete' and previous_measure:
 564                             previous_measure.message ('%s measure? Expected: %s, Difference: %s' % (problem, now, new_now - now))
 565                     now = new_now
 566                 measure_start_moment = now
 567                 measure_position = Rational (0)
 568
 569             for n in m.get_all_children ():
 570                 # figured bass has a duration, but applies to the next note
 571                 # and should not change the current measure position!
 572                 if isinstance (n, FiguredBass):
 573                     n._divisions = factor.denominator ()
 574                     n._when = now
 575                     n._measure_position = measure_position
 576                     continue
 577
 578                 if isinstance (n, Hash_text):
 579                     continue
 580                 dur = Rational (0)
 581
 582                 if n.__class__ == Attributes:
 583                     n.set_attributes_from_previous (attributes_dict)
 584                     n.read_self ()
 585                     attributes_dict = n._dict.copy ()
 586                     attributes_object = n
 587
 588                     factor = Rational (1,
 589                                        int (attributes_dict.get ('divisions').get_text ()))
 590
 591
 592                 if (n.get_maybe_exist_typed_child (Duration)):
 593                     mxl_dur = n.get_maybe_exist_typed_child (Duration)
 594                     dur = mxl_dur.get_length () * factor
 595
 596                     if n.get_name() == 'backup':
 597                         dur = - dur
 598                         # reset all graces before the backup to after-graces:
 599                         for n in pending_graces:
 600                             n._when = n._prev_when
 601                             n._measure_position = n._prev_measure_position
 602                             n._after_grace = True
 603                         pending_graces = []
 604                     if n.get_maybe_exist_typed_child (Grace):
 605                         dur = Rational (0)
 606
 607                     rest = n.get_maybe_exist_typed_child (Rest)
 608                     if (rest
 609                         and attributes_object
 610                         and attributes_object.get_measure_length () == dur):
 611
 612                         rest._is_whole_measure = True
 613
 614                 if (dur > Rational (0)
 615                     and n.get_maybe_exist_typed_child (Chord)):
 616                     now = last_moment
 617                     measure_position = last_measure_position
 618
 619                 n._when = now
 620                 n._measure_position = measure_position
 621
 622                 # For all grace notes, store the previous note,  in case need
 623                 # to turn the grace note into an after-grace later on!
 624                 if isinstance(n, Note) and n.is_grace ():
 625                     n._prev_when = last_moment
 626                     n._prev_measure_position = last_measure_position
 627                 # After-graces are placed at the same position as the previous note
 628                 if isinstance(n, Note) and  n.is_after_grace ():
 629                     # TODO: We should do the same for grace notes at the end of
 630                     # a measure with no following note!!!
 631                     n._when = last_moment
 632                     n._measure_position = last_measure_position
 633                 elif isinstance(n, Note) and n.is_grace ():
 634                     pending_graces.append (n)
 635                 elif (dur > Rational (0)):
 636                     pending_graces = [];
 637
 638                 n._duration = dur
 639                 if dur > Rational (0):
 640                     last_moment = now
 641                     last_measure_position = measure_position
 642                     now += dur
 643                     measure_position += dur
 644                 elif dur < Rational (0):
 645                     # backup element, reset measure position
 646                     now += dur
 647                     measure_position += dur
 648                     if measure_position < 0:
 649                         # backup went beyond the measure start => reset to 0
 650                         now -= measure_position
 651                         measure_position = 0
 652                     last_moment = now
 653                     last_measure_position = measure_position
 654                 if n._name == 'note':
 655                     instrument = n.get_maybe_exist_named_child ('instrument')
 656                     if instrument:
 657                         n.instrument_name = part_list.get_instrument (instrument.id)
 658
 659             # reset all graces at the end of the measure to after-graces:
 660             for n in pending_graces:
 661                 n._when = n._prev_when
 662                 n._measure_position = n._prev_measure_position
 663                 n._after_grace = True
 664             pending_graces = []
 665             # Incomplete first measures are not padded, but registered as partial
 666             if is_first_measure:
 667                 is_first_measure = False
 668                 # upbeats are marked as implicit measures
 669                 if attributes_object and m.is_implicit ():
 670                     length = attributes_object.get_measure_length ()
 671                     measure_end = measure_start_moment + length
 672                     if measure_end <> now:
 673                         m.partial = now
 674             previous_measure = m
 675
 676     # modify attributes so that only those applying to the given staff remain
 677     def extract_attributes_for_staff (part, attr, staff):
 678         attributes = copy.copy (attr)
 679         attributes._children = [];
 680         attributes._dict = attr._dict.copy ()
 681         attributes._original_tag = attr
 682         # copy only the relevant children over for the given staff
 683         for c in attr._children:
 684             if (not (hasattr (c, 'number') and (c.number != staff)) and
 685                 not (isinstance (c, Hash_text))):
 686                 attributes._children.append (c)
 687         if not attributes._children:
 688             return None
 689         else:
 690             return attributes
 691
 692     def extract_voices (part):
 693         voices = {}
 694         measures = part.get_typed_children (Measure)
 695         elements = []
 696         for m in measures:
 697             if m.partial > 0:
 698                 elements.append (Partial (m.partial))
 699             elements.extend (m.get_all_children ())
 700         # make sure we know all voices already so that dynamics, clefs, etc.
 701         # can be assigned to the correct voices
 702         voice_to_staff_dict = {}
 703         for n in elements:
 704             voice_id = n.get_maybe_exist_named_child (u'voice')
 705             vid = None
 706             if voice_id:
 707                 vid = voice_id.get_text ()
 708
 709             staff_id = n.get_maybe_exist_named_child (u'staff')
 710             sid = None
 711             if staff_id:
 712                 sid = staff_id.get_text ()
 713             else:
 714                 sid = "None"
 715             if vid and not voices.has_key (vid):
 716                 voices[vid] = Musicxml_voice()
 717             if vid and sid and not n.get_maybe_exist_typed_child (Grace):
 718                 if not voice_to_staff_dict.has_key (vid):
 719                     voice_to_staff_dict[vid] = sid
 720         # invert the voice_to_staff_dict into a staff_to_voice_dict (since we
 721         # need to assign staff-assigned objects like clefs, times, etc. to
 722         # all the correct voices. This will never work entirely correct due
 723         # to staff-switches, but that's the best we can do!
 724         staff_to_voice_dict = {}
 725         for (v,s) in voice_to_staff_dict.items ():
 726             if not staff_to_voice_dict.has_key (s):
 727                 staff_to_voice_dict[s] = [v]
 728             else:
 729                 staff_to_voice_dict[s].append (v)
 730
 731
 732         start_attr = None
 733         assign_to_next_note = []
 734         id = None
 735         for n in elements:
 736             voice_id = n.get_maybe_exist_typed_child (get_class ('voice'))
 737
 738             if not (voice_id or isinstance (n, Attributes) or
 739                     isinstance (n, Direction) or isinstance (n, Partial) or
 740                     isinstance (n, Barline) or isinstance (n, Harmony) or
 741                     isinstance (n, FiguredBass) ):
 742                 continue
 743
 744             if isinstance (n, Attributes) and not start_attr:
 745                 start_attr = n
 746                 continue
 747
 748             if isinstance (n, Attributes):
 749                 # assign these only to the voices they really belongs to!
 750                 for (s, vids) in staff_to_voice_dict.items ():
 751                     staff_attributes = part.extract_attributes_for_staff (n, s)
 752                     if staff_attributes:
 753                         for v in vids:
 754                             voices[v].add_element (staff_attributes)
 755                 continue
 756
 757             if isinstance (n, Partial) or isinstance (n, Barline):
 758                 for v in voices.keys ():
 759                     voices[v].add_element (n)
 760                 continue
 761
 762             if isinstance (n, Direction):
 763                 staff_id = n.get_maybe_exist_named_child (u'staff')
 764                 if staff_id:
 765                     staff_id = staff_id.get_text ()
 766                 if staff_id:
 767                     dir_voices = staff_to_voice_dict.get (staff_id, voices.keys ())
 768                 else:
 769                     dir_voices = voices.keys ()
 770                 for v in dir_voices:
 771                     voices[v].add_element (n)
 772                 continue
 773
 774             if isinstance (n, Harmony) or isinstance (n, FiguredBass):
 775                 # store the harmony or figured bass element until we encounter
 776                 # the next note and assign it only to that one voice.
 777                 assign_to_next_note.append (n)
 778                 continue
 779
 780             id = voice_id.get_text ()
 781             if hasattr (n, 'print-object') and getattr (n, 'print-object') == "no":
 782                 #Skip this note.
 783                 pass
 784             else:
 785                 for i in assign_to_next_note:
 786                     voices[id].add_element (i)
 787                 assign_to_next_note = []
 788                 voices[id].add_element (n)
 789
 790         # Assign all remaining elements from assign_to_next_note to the voice
 791         # of the previous note:
 792         for i in assign_to_next_note:
 793             voices[id].add_element (i)
 794         assign_to_next_note = []
 795
 796         if start_attr:
 797             for (s, vids) in staff_to_voice_dict.items ():
 798                 staff_attributes = part.extract_attributes_for_staff (start_attr, s)
 799                 staff_attributes.read_self ()
 800                 part._staff_attributes_dict[s] = staff_attributes
 801                 for v in vids:
 802                     voices[v].insert (0, staff_attributes)
 803                     voices[v]._elements[0].read_self()
 804
 805         part._voices = voices
 806
 807     def get_voices (self):
 808         return self._voices
 809     def get_staff_attributes (self):
 810         return self._staff_attributes_dict
 811
 812 class Notations (Music_xml_node):
 813     def get_tie (self):
 814         ts = self.get_named_children ('tied')
 815         starts = [t for t in ts if t.type == 'start']
 816         if starts:
 817             return starts[0]
 818         else:
 819             return None
 820
 821     def get_tuplets (self):
 822         return self.get_typed_children (Tuplet)
 823
 824 class Time_modification(Music_xml_node):
 825     def get_fraction (self):
 826         b = self.get_maybe_exist_named_child ('actual-notes')
 827         a = self.get_maybe_exist_named_child ('normal-notes')
 828         return (int(a.get_text ()), int (b.get_text ()))
 829
 830 class Accidental (Music_xml_node):
 831     def __init__ (self):
 832         Music_xml_node.__init__ (self)
 833         self.editorial = False
 834         self.cautionary = False
 835
 836 class Music_xml_spanner (Music_xml_node):
 837     def get_type (self):
 838         if hasattr (self, 'type'):
 839             return self.type
 840         else:
 841             return 0
 842     def get_size (self):
 843         if hasattr (self, 'size'):
 844             return string.atoi (self.size)
 845         else:
 846             return 0
 847
 848 class Wedge (Music_xml_spanner):
 849     pass
 850
 851 class Tuplet (Music_xml_spanner):
 852     pass
 853
 854 class Bracket (Music_xml_spanner):
 855     pass
 856
 857 class Dashes (Music_xml_spanner):
 858     pass
 859
 860 class Slur (Music_xml_spanner):
 861     def get_type (self):
 862         return self.type
 863
 864 class Beam (Music_xml_spanner):
 865     def get_type (self):
 866         return self.get_text ()
 867     def is_primary (self):
 868         return self.number == "1"
 869
 870 class Wavy_line (Music_xml_spanner):
 871     pass
 872
 873 class Pedal (Music_xml_spanner):
 874     pass
 875
 876 class Glissando (Music_xml_spanner):
 877     pass
 878
 879 class Slide (Music_xml_spanner):
 880     pass
 881
 882 class Octave_shift (Music_xml_spanner):
 883     # default is 8 for the octave-shift!
 884     def get_size (self):
 885         if hasattr (self, 'size'):
 886             return string.atoi (self.size)
 887         else:
 888             return 8
 889
 890 class Chord (Music_xml_node):
 891     pass
 892
 893 class Dot (Music_xml_node):
 894     pass
 895
 896 # Rests in MusicXML are <note> blocks with a <rest> inside. This class is only
 897 # for the inner <rest> element, not the whole rest block.
 898 class Rest (Music_xml_node):
 899     def __init__ (self):
 900         Music_xml_node.__init__ (self)
 901         self._is_whole_measure = False
 902     def is_whole_measure (self):
 903         return self._is_whole_measure
 904     def get_step (self):
 905         ch = self.get_maybe_exist_typed_child (get_class (u'display-step'))
 906         if ch:
 907             step = ch.get_text ().strip ()
 908             return step
 909         else:
 910             return None
 911     def get_octave (self):
 912         ch = self.get_maybe_exist_typed_child (get_class (u'display-octave'))
 913         if ch:
 914             step = ch.get_text ().strip ()
 915             return int (step)
 916         else:
 917             return None
 918
 919 class Type (Music_xml_node):
 920     pass
 921 class Grace (Music_xml_node):
 922     pass
 923 class Staff (Music_xml_node):
 924     pass
 925
 926 class Direction (Music_xml_node):
 927     pass
 928 class DirType (Music_xml_node):
 929     pass
 930
 931 class Bend (Music_xml_node):
 932     def bend_alter (self):
 933         alter = self.get_maybe_exist_named_child ('bend-alter')
 934         if alter:
 935             return alter.get_text()
 936         else:
 937             return 0
 938
 939 class Words (Music_xml_node):
 940     pass
 941
 942 class Harmony (Music_xml_node):
 943     pass
 944
 945 class ChordPitch (Music_xml_node):
 946     def step_class_name (self):
 947         return u'root-step'
 948     def alter_class_name (self):
 949         return u'root-alter'
 950     def get_step (self):
 951         ch = self.get_unique_typed_child (get_class (self.step_class_name ()))
 952         return ch.get_text ().strip ()
 953     def get_alteration (self):
 954         ch = self.get_maybe_exist_typed_child (get_class (self.alter_class_name ()))
 955         alter = 0
 956         if ch:
 957             alter = int (ch.get_text ().strip ())
 958         return alter
 959
 960 class Root (ChordPitch):
 961     pass
 962
 963 class Bass (ChordPitch):
 964     def step_class_name (self):
 965         return u'bass-step'
 966     def alter_class_name (self):
 967         return u'bass-alter'
 968
 969 class ChordModification (Music_xml_node):
 970     def get_type (self):
 971         ch = self.get_maybe_exist_typed_child (get_class (u'degree-type'))
 972         return {'add': 1, 'alter': 1, 'subtract': -1}.get (ch.get_text ().strip (), 0)
 973     def get_value (self):
 974         ch = self.get_maybe_exist_typed_child (get_class (u'degree-value'))
 975         value = 0
 976         if ch:
 977             value = int (ch.get_text ().strip ())
 978         return value
 979     def get_alter (self):
 980         ch = self.get_maybe_exist_typed_child (get_class (u'degree-alter'))
 981         value = 0
 982         if ch:
 983             value = int (ch.get_text ().strip ())
 984         return value
 985
 986
 987 class Frame (Music_xml_node):
 988     def get_frets (self):
 989         return self.get_named_child_value_number ('frame-frets', 4)
 990     def get_strings (self):
 991         return self.get_named_child_value_number ('frame-strings', 6)
 992     def get_first_fret (self):
 993         return self.get_named_child_value_number ('first-fret', 1)
 994
 995 class Frame_Note (Music_xml_node):
 996     def get_string (self):
 997         return self.get_named_child_value_number ('string', 1)
 998     def get_fret (self):
 999         return self.get_named_child_value_number ('fret', 0)
1000     def get_fingering (self):
1001         return self.get_named_child_value_number ('fingering', -1)
1002     def get_barre (self):
1003         n = self.get_maybe_exist_named_child ('barre')
1004         if n:
1005             return getattr (n, 'type', '')
1006         else:
1007             return ''
1008
1009 class FiguredBass (Music_xml_node):
1010     pass
1011
1012 class BeatUnit (Music_xml_node):
1013     pass
1014
1015 class BeatUnitDot (Music_xml_node):
1016     pass
1017
1018 class PerMinute (Music_xml_node):
1019     pass
1020
1021
1022
1023 ## need this, not all classes are instantiated
1024 ## for every input file. Only add those classes, that are either directly
1025 ## used by class name or extend Music_xml_node in some way!
1026 class_dict = {
1027         '#comment': Hash_comment,
1028         '#text': Hash_text,
1029         'accidental': Accidental,
1030         'attributes': Attributes,
1031         'barline': Barline,
1032         'bar-style': BarStyle,
1033         'bass': Bass,
1034         'beam' : Beam,
1035         'beat-unit': BeatUnit,
1036         'beat-unit-dot': BeatUnitDot,
1037         'bend' : Bend,
1038         'bracket' : Bracket,
1039         'chord': Chord,
1040         'dashes' : Dashes,
1041         'degree' : ChordModification,
1042         'dot': Dot,
1043         'direction': Direction,
1044         'direction-type': DirType,
1045         'duration': Duration,
1046         'frame': Frame,
1047         'frame-note': Frame_Note,
1048         'figured-bass': FiguredBass,
1049         'glissando': Glissando,
1050         'grace': Grace,
1051         'harmony': Harmony,
1052         'identification': Identification,
1053         'lyric': Lyric,
1054         'measure': Measure,
1055         'notations': Notations,
1056         'note': Note,
1057         'octave-shift': Octave_shift,
1058         'part': Part,
1059     'part-group': Part_group,
1060         'part-list': Part_list,
1061         'pedal': Pedal,
1062         'per-minute': PerMinute,
1063         'pitch': Pitch,
1064         'rest': Rest,
1065         'root': Root,
1066         'score-part': Score_part,
1067         'slide': Slide,
1068         'slur': Slur,
1069         'staff': Staff,
1070         'syllabic': Syllabic,
1071         'text': Text,
1072         'time-modification': Time_modification,
1073         'tuplet': Tuplet,
1074         'type': Type,
1075         'unpitched': Unpitched,
1076         'wavy-line': Wavy_line,
1077         'wedge': Wedge,
1078         'words': Words,
1079         'work': Work,
1080 }
1081
1082 def name2class_name (name):
1083     name = name.replace ('-', '_')
1084     name = name.replace ('#', 'hash_')
1085     name = name[0].upper() + name[1:].lower()
1086
1087     return str (name)
1088
1089 def get_class (name):
1090     classname = class_dict.get (name)
1091     if classname:
1092         return classname
1093     else:
1094         class_name = name2class_name (name)
1095         klass = new.classobj (class_name, (Music_xml_node,) , {})
1096         class_dict[name] = klass
1097         return klass
1098
1099 def lxml_demarshal_node (node):
1100     name = node.tag
1101
1102     # Ignore comment nodes, which are also returned by the etree parser!
1103     if name is None or node.__class__.__name__ == "_Comment":
1104         return None
1105     klass = get_class (name)
1106     py_node = klass()
1107
1108     py_node._original = node
1109     py_node._name = name
1110     py_node._data = node.text
1111     py_node._children = [lxml_demarshal_node (cn) for cn in node.getchildren()]
1112     py_node._children = filter (lambda x: x, py_node._children)
1113
1114     for c in py_node._children:
1115         c._parent = py_node
1116
1117     for (k, v) in node.items ():
1118         py_node.__dict__[k] = v
1119         py_node._attribute_dict[k] = v
1120
1121     return py_node
1122
1123 def minidom_demarshal_node (node):
1124     name = node.nodeName
1125
1126     klass = get_class (name)
1127     py_node = klass ()
1128     py_node._name = name
1129     py_node._children = [minidom_demarshal_node (cn) for cn in node.childNodes]
1130     for c in py_node._children:
1131         c._parent = py_node
1132
1133     if node.attributes:
1134         for (nm, value) in node.attributes.items ():
1135             py_node.__dict__[nm] = value
1136             py_node._attribute_dict[nm] = value
1137
1138     py_node._data = None
1139     if node.nodeType == node.TEXT_NODE and node.data:
1140         py_node._data = node.data
1141
1142     py_node._original = node
1143     return py_node
1144
1145
1146 if __name__  == '__main__':
1147     import lxml.etree
1148
1149     tree = lxml.etree.parse ('beethoven.xml')
1150     mxl_tree = lxml_demarshal_node (tree.getroot ())
1151     ks = class_dict.keys ()
1152     ks.sort ()
1153     print '\n'.join (ks)