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|
# -*- coding: utf-8 -*-
# Songwrite 3
# Copyright (C) 2001-2007 Jean-Baptiste LAMY -- jibalamy@free.fr
#
# 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 sys, array, re
import string as string_module # not a guitar string !
from io import StringIO
import songwrite3.model as model
def parse(texttab):
ASCII_STRING = "-="
ASCII_BAR = "|"
ASCII_STRESSED = "'"
ASCII_HAMMER = "hpl"
ASCII_SLIDE = "/\\s"
ASCII_BEND = "b"
ASCII_DEAD_NOTE = "xd"
ASCII_TREMOLO = "~vt"
ASCII_TAB = ASCII_STRING + ASCII_BAR + string_module.digits + ASCII_STRESSED + ASCII_HAMMER + ASCII_SLIDE + ASCII_BEND + ASCII_DEAD_NOTE + ASCII_TREMOLO
TITRE_AUTHOR = re.compile(r".*\(.*\)")
COPYRIGHT = re.compile(r"(C|c)opy(right|left)\s*[0-9]{2,4}")
TEMPO = re.compile(r"((?<=(T|t)empo(:|=)\s)|(?<=(T|t)empo(:|=))|(?<=(T|t)empo\s(:|=)\s)|(?<=(T|t)empo\s))([0-9]+)")
song = model.Song()
lines = texttab.split("\n")
tempo = TEMPO.findall(texttab)
if tempo: tempo = tempo[0][-1]
else: tempo = 60
i = 0
header = ""
song_comments_ended = 0
if (not lines[i]) or (not lines[i][0] in ASCII_TAB): # First line is guessed to be the title.
if TITRE_AUTHOR.match(lines[i]):
start = lines[i].find("(")
song.title = lines[i][: start]
song.authors = lines[i][start + 1 : lines[i].find(")")]
else: song.title = lines[i]
i = i + 1
while 1:
if not lines[i]: song_comments_ended = 1
elif not lines[i][0] in ASCII_TAB:
if COPYRIGHT.search(lines[i]): song.copyright = lines[i]
else:
if song_comments_ended:
if header: header = header + "\n" + lines[i]
else: header = lines[i]
else:
if song.comments: song.comments = song.comments + "\n" + lines[i]
else: song.comments = lines[i]
else: break
i = i + 1
# Compute rythm
if lines[i][0] in ASCII_BAR: mesure_len = lines[i][1:].find("|")
else: mesure_len = lines[i].find("|")
if mesure_len % 4 == 0: unit = float(mesure_len / 4) # Guess it is 4/4
elif mesure_len % 3 == 0: unit = float(mesure_len / 3) # Guess it is 3/4
pos = []
last_bar_pos = 0
partition = model.Partition(song)
partition.header = header
# adrian@sixfingeredman.net: hack to guess tuning
if "DADGAD" in header: partition.view = model.GuitarDADGADView(partition)
else: partition.view = model.GuitarView (partition)
current_note = None
next_note = model.Note(partition, 0, 96, 0)
song.partitions.append(partition)
song.mesures *= 0
while (i < len(lines)):
string_id = 0
while (i < len(lines)) and lines[i] and (lines[i][0] in ASCII_TAB):
j = 0
if string_id >= len(pos) - 1: pos.append(0)
while j < len(lines[i]):
char = lines[i][j]
if char in ASCII_BAR:
if (string_id == 0) and (partition is song.partitions[0]):
if j > 1:
song.add_mesure(model.Mesure(song,
int(round(last_bar_pos / unit * 96.0)),
rythm1 = int(round((pos[string_id] - last_bar_pos) / unit)),
tempo = tempo))
last_bar_pos = pos[string_id]
j = j + 1
continue
elif char in string_module.digits:
if (j + 1 < len(lines[i])) and (lines[i][j + 1] in string_module.digits):
fret = int(char + lines[i][j + 1])
pos[string_id] = pos[string_id] + 1
j = j + 1
else: fret = int(char)
next_note.value = partition.view.strings[string_id].base_note + fret
next_note.time = int(round((pos[string_id] - 1)/ unit * 96.0))
next_note.string_id = string_id
partition.notes.append(next_note)
current_note = next_note
next_note = model.Note(partition, 0, 96, 0)
elif char in ASCII_STRESSED : next_note.volume = 255
elif char in ASCII_TREMOLO : next_note.fx = "tremolo"
elif char in ASCII_DEAD_NOTE: next_note.fx = "dead"
elif char in ASCII_BEND : next_note.fx = "bend"
elif char in ASCII_HAMMER:
current_note.link_fx = "link"
current_note.link_to(next_note)
elif char in ASCII_SLIDE:
current_note.link_fx = "slide"
current_note.link_to(next_note)
elif char in ASCII_STRING: pass
else: print("* parse_texttab * Unknown character %s at line %s, position %s ! Skipping." % (char, i, j), file = sys.stderr)
pos[string_id] = pos[string_id] + 1
j = j + 1
i = i + 1
string_id = string_id + 1
while (i < len(lines)) and (not lines[i]): i = i + 1
if (i < len(lines)) and ((len(lines[i]) < 3) or (not lines[i][0] in ASCII_TAB) or (not lines[i][1] in ASCII_TAB)): break
# Compute notes' durations
partition.notes.sort()
last_notes = []
for note in partition.notes:
if last_notes and (last_notes[0].time != note.time):
for last_note in last_notes:
last_note.duration = note.time - last_note.time
last_notes = []
last_notes.append(note)
last_duration = song.mesure_at(last_notes[0].time, 1).end_time() - last_notes[0].time
for last_note in last_notes:
last_note.duration = last_duration
return song
def texttab(song, cut_tab_at = 80):
"texttab(song) -> string -- Generates an ascii tablature from a song"
min_duration = sys.maxsize
ternary = 0
partitions = []
for partition in song.partitions:
if isinstance(partition, model.Partition) and isinstance(partition.view, model.TablatureView):
partitions.append(partition)
for note in partition.notes:
dur = note.duration
if note.is_triplet(): # Triplets are a hack...
ternary = 1
if note.duration == 32: dur = 48
if note.duration == 16: dur = 24
if note.duration == 8: dur = 12
else:
rest = note.time % min_duration
if rest > 0: min_duration = rest
if dur < min_duration: min_duration = dur
min_duration = float(min_duration)
slotsize = 2
for partition in song.partitions:
if isinstance(partition, model.Partition) and isinstance(partition.view, model.TablatureView):
for note in partition.notes:
if note.is_triplet():
slotsize = 3
break
duration = min_duration / slotsize
alltabs = StringIO()
alltabs.write("%s (%s)\n" % (song.title, song.authors))
if song.copyright: alltabs.write(song.copyright + "\n")
if song.comments : alltabs.write(song.comments + "\n")
alltabs.write("\n")
for partition in song.partitions:
if isinstance(partition, model.Lyrics):
alltabs.write(partition.header + "\n")
text = partition.text.replace("\t_", "").replace("_", "").replace("-\t", "").replace("\t", " ").replace("\n", "").replace("\\\\", "\n").replace(" ", " ")
alltabs.write("\n".join(i.strip() for i in text.split("\n")))
alltabs.write("\n")
elif isinstance(partition.view, model.TablatureView):
alltabs.write(partition.header + "\n")
strings = partition.view.strings
tabs = [array.array("u", "-" * int(round(partition.end_time() / min_duration * slotsize))) for string in strings]
def string_id(note):
return getattr(note, "string_id", len(strings) - 1)
for note in partition.notes:
sid = string_id(note)
time = int(round(note.time / min_duration * slotsize))
text = strings[sid].value_2_text(note)
if note.linked_from:
if note.linked_from.link_fx == "link":
link_type = note.linked_from.link_type()
if link_type == 0: continue # Don't show linked note, since ascii tab doesn't matter note duration !
elif link_type == -1: tabs[sid][time] = "p"
elif link_type == 1: tabs[sid][time] = "h"
elif note.linked_from.link_fx == "slide":
if note.linked_from.value > note.value: tabs[sid][time] = "\\"
else: tabs[sid][time] = "/"
if note.fx == "dead" : tabs[sid][time] = "x"
elif note.fx == "tremolo": tabs[sid][time] = "~"
elif note.fx == "bend" : tabs[sid][time] = "b"
if (note.volume > 220) and (tabs[sid][time] == "-"): tabs[sid][time] = "'" # Stressed note
if len(text) == 1: tabs[sid][time + 1] = text
else:
tabs[sid][time + 1] = text[0]
tabs[sid][time + 2] = text[1]
tabs = [tab.tounicode() for tab in tabs] # Turn arrays to strings.
mesure = song.mesures[0]
i = 0
while i < len(song.mesures):
mesures = []
length = 1
while i < len(song.mesures):
length = length + mesure.duration / min_duration * slotsize + 1
if length > cut_tab_at: break
mesures.append(mesure)
i = i + 1
if i >= len(song.mesures): break
mesure = song.mesures[i]
string_base_note_length = max([len(model.note_label(string.base_note, False)) for string in strings])
string_base_note_pattern = "%%-%ss" % string_base_note_length
for sid in range(len(tabs)):
tab = tabs[sid]
# adrian@sixfingeredman.net: this screws up the importer
# alltabs.write(string_base_note_pattern % model.note_label(strings[sid].base_note, False))
for mes in mesures:
content = tab[int(round(mes.time / min_duration * slotsize)) : int(round(mes.end_time() / min_duration * slotsize))]
if not content:
i = sys.maxsize
break
alltabs.write("|" + content)
alltabs.write("|\n")
alltabs.write("\n")
return alltabs.getvalue()
|
