forked from openlp/openlp
220 lines
9.1 KiB
Python
220 lines
9.1 KiB
Python
# -*- coding: utf-8 -*-
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# vim: autoindent shiftwidth=4 expandtab textwidth=120 tabstop=4 softtabstop=4
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###############################################################################
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# OpenLP - Open Source Lyrics Projection #
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# --------------------------------------------------------------------------- #
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# Copyright (c) 2008-2014 Raoul Snyman #
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# Portions copyright (c) 2008-2014 Tim Bentley, Gerald Britton, Jonathan #
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# Corwin, Samuel Findlay, Michael Gorven, Scott Guerrieri, Matthias Hub, #
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# Meinert Jordan, Armin Köhler, Erik Lundin, Edwin Lunando, Brian T. Meyer. #
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# Joshua Miller, Stevan Pettit, Andreas Preikschat, Mattias Põldaru, #
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# Christian Richter, Philip Ridout, Simon Scudder, Jeffrey Smith, #
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# Maikel Stuivenberg, Martin Thompson, Jon Tibble, Dave Warnock, #
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# Frode Woldsund, Martin Zibricky, Patrick Zimmermann #
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# --------------------------------------------------------------------------- #
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# This program is free software; you can redistribute it and/or modify it #
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# under the terms of the GNU General Public License as published by the Free #
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# Software Foundation; version 2 of the License. #
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# #
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# This program is distributed in the hope that it will be useful, but WITHOUT #
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or #
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# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for #
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# more details. #
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# #
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# You should have received a copy of the GNU General Public License along #
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# with this program; if not, write to the Free Software Foundation, Inc., 59 #
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# Temple Place, Suite 330, Boston, MA 02111-1307 USA #
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###############################################################################
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"""
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The :mod:`powersongimport` module provides the functionality for importing
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PowerSong songs into the OpenLP database.
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"""
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import logging
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import fnmatch
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import os
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from openlp.core.common import translate
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from openlp.plugins.songs.lib.songimport import SongImport
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log = logging.getLogger(__name__)
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class PowerSongImport(SongImport):
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"""
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The :class:`PowerSongImport` class provides the ability to import song files
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from PowerSong.
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**PowerSong 1.0 Song File Format:**
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The file has a number of label-field (think key-value) pairs.
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Label and Field strings:
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* Every label and field is a variable length string preceded by an
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integer specifying it's byte length.
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* Integer is 32-bit but is encoded in 7-bit format to save space. Thus
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if length will fit in 7 bits (ie <= 127) it takes up only one byte.
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Metadata fields:
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* Every PowerSong file has a TITLE field.
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* There is zero or more AUTHOR fields.
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* There is always a COPYRIGHTLINE label, but its field may be empty.
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This field may also contain a CCLI number: e.g. "CCLI 176263".
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Lyrics fields:
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* Each verse is contained in a PART field.
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* Lines have Windows line endings ``CRLF`` (0x0d, 0x0a).
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* There is no concept of verse types.
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Valid extensions for a PowerSong song file are:
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* .song
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"""
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@staticmethod
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def is_valid_source(import_source):
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"""
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Checks if source is a PowerSong 1.0 folder:
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* is a directory
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* contains at least one *.song file
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"""
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if os.path.isdir(import_source):
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for file in os.listdir(import_source):
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if fnmatch.fnmatch(file, '*.song'):
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return True
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return False
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def do_import(self):
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"""
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Receive either a list of files or a folder (unicode) to import.
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"""
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from .importer import SongFormat
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ps_string = SongFormat.get(SongFormat.PowerSong, 'name')
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if isinstance(self.import_source, str):
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if os.path.isdir(self.import_source):
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dir = self.import_source
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self.import_source = []
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for file in os.listdir(dir):
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if fnmatch.fnmatch(file, '*.song'):
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self.import_source.append(os.path.join(dir, file))
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else:
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self.import_source = ''
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if not self.import_source or not isinstance(self.import_source, list):
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self.log_error(translate('SongsPlugin.PowerSongImport', 'No songs to import.'),
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translate('SongsPlugin.PowerSongImport', 'No %s files found.') % ps_string)
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return
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self.import_wizard.progress_bar.setMaximum(len(self.import_source))
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for file in self.import_source:
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if self.stop_import_flag:
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return
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self.set_defaults()
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parse_error = False
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with open(file, 'rb') as song_data:
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while True:
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try:
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label = self._read_string(song_data)
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if not label:
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break
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field = self._read_string(song_data)
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except ValueError:
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parse_error = True
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self.log_error(os.path.basename(file), str(
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translate('SongsPlugin.PowerSongImport', 'Invalid %s file. Unexpected byte value.')) %
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ps_string)
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break
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else:
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if label == 'TITLE':
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self.title = field.replace('\n', ' ')
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elif label == 'AUTHOR':
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self.parse_author(field)
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elif label == 'COPYRIGHTLINE':
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found_copyright = True
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self._parse_copyright_cCCLI(field)
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elif label == 'PART':
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self.add_verse(field)
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if parse_error:
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continue
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# Check that file had TITLE field
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if not self.title:
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self.log_error(os.path.basename(file), str(
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translate('SongsPlugin.PowerSongImport', 'Invalid %s file. Missing "TITLE" header.')) % ps_string)
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continue
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# Check that file had COPYRIGHTLINE label
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if not found_copyright:
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self.log_error(self.title, str(
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translate('SongsPlugin.PowerSongImport', 'Invalid %s file. Missing "COPYRIGHTLINE" header.')) %
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ps_string)
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continue
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# Check that file had at least one verse
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if not self.verses:
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self.log_error(self.title, str(
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translate('SongsPlugin.PowerSongImport', 'Verses not found. Missing "PART" header.')))
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continue
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if not self.finish():
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self.log_error(self.title)
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def _read_string(self, file_object):
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"""
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Reads in next variable-length string.
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"""
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string_len = self._read_7_bit_encoded_integer(file_object)
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return str(file_object.read(string_len), 'utf-8', 'ignore')
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def _read_7_bit_encoded_integer(self, file_object):
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"""
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Reads in a 32-bit integer in compressed 7-bit format.
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Accomplished by reading the integer 7 bits at a time. The high bit
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of the byte when set means to continue reading more bytes.
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If the integer will fit in 7 bits (ie <= 127), it only takes up one
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byte. Otherwise, it may take up to 5 bytes.
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Reference: .NET method System.IO.BinaryReader.Read7BitEncodedInt
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"""
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val = 0
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shift = 0
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i = 0
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while True:
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# Check for corrupted stream (since max 5 bytes per 32-bit integer)
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if i == 5:
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raise ValueError
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byte = self._read_byte(file_object)
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# Strip high bit and shift left
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val += (byte & 0x7f) << shift
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shift += 7
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high_bit_set = byte & 0x80
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if not high_bit_set:
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break
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i += 1
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return val
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def _read_byte(self, file_object):
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"""
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Reads in next byte as an unsigned integer
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Note: returns 0 at end of file.
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"""
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byte_str = file_object.read(1)
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# If read result is empty, then reached end of file
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if not byte_str:
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return 0
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else:
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return ord(byte_str)
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def _parse_copyright_cCCLI(self, field):
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"""
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Look for CCLI song number, and get copyright
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"""
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copyright, sep, ccli_no = field.rpartition('CCLI')
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if not sep:
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copyright = ccli_no
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ccli_no = ''
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if copyright:
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self.add_copyright(copyright.rstrip('\n').replace('\n', ' '))
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if ccli_no:
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ccli_no = ccli_no.strip(' :')
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if ccli_no.isdigit():
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self.ccli_number = ccli_no
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