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#!/usr/bin/python
#
# Copyright (C) 2010, Nokia <ivan.frade@nokia.com>
#
# 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 2
# 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, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301, USA.
#
from common.utils import configuration as cfg
from common.utils.helpers import log
import os
import re
import subprocess
class ExtractorParser(object):
def parse_tracker_extract_output(self, text):
"""
Parse stdout of `tracker-extract --file` to get SPARQL statements.
Calls the extractor a returns a dictionary of property, value.
Example:
{ 'nie:filename': 'a.jpeg' ,
'tracker:added': '2008-12-12T12:23:34Z'
}
"""
metadata = {}
parts = self.get_statements_from_stdout_output(text)
extras = self.__process_where_part(parts['where'])
for attribute_value in self.__process_lines(parts['item']):
att, value = attribute_value.split(" ", 1)
if value.startswith("?") and extras.has_key(value):
value = extras[value]
if metadata.has_key(att):
metadata [att].append(value)
else:
metadata [att] = [value]
return metadata
def get_statements_from_stdout_output(self, text):
lines = text.split('\n')
parts = {}
current_part = None
part_start = None
i = 0
for i in range(0, len(lines)):
if lines[i] == 'SPARQL pre-update:':
current_part = 'preupdate'
elif lines[i] == 'SPARQL item:':
current_part = 'item'
elif lines[i] == 'SPARQL where clause:':
current_part = 'where'
elif lines[i] == 'SPARQL post-update:':
current_part = 'postupdate'
if lines[i] == '--':
if part_start is None:
part_start = i + 1
else:
part_lines = lines[part_start:i]
parts[current_part] = '\n'.join(part_lines)
current_part = None
part_start = None
if current_part is not None:
raise Exception("End of text while parsing %s in tracker-extract "
"output" % current_part)
if len(parts) == 0:
raise Exception("No metadata was found by tracker-extract")
return parts
def __process_lines(self, embedded):
"""
Translate each line in a "prop value" string, handling anonymous nodes.
Example:
nfo:width 699 ; -> 'nfo:width 699'
or
nao:hasTag [ a nao:Tag ;
nao:prefLabel "tracker"] ; -> nao:hasTag:prefLabel 'tracker'
Would be so cool to implement this with yield and generators... :)
"""
grouped_lines = []
current_line = ""
anon_node_open = False
for l in embedded.split ("\n\t"):
if "[" in l:
current_line = current_line + l
anon_node_open = True
continue
if "]" in l:
anon_node_open = False
current_line += l
final_lines = self.__handle_anon_nodes (current_line.strip ())
grouped_lines = grouped_lines + final_lines
current_line = ""
continue
if anon_node_open:
current_line += l
else:
if (len (l.strip ()) == 0):
continue
final_lines = self.__handle_multivalues (l.strip ())
grouped_lines = grouped_lines + final_lines
return map (self.__clean_value, grouped_lines)
def __process_where_part(self, where):
gettags = re.compile ("(\?\w+)\ a\ nao:Tag\ ;\ nao:prefLabel\ \"([\w\ -]+)\"")
tags = {}
for l in where.split ("\n"):
if len (l) == 0:
continue
match = gettags.search (l)
if (match):
tags [match.group(1)] = match.group (2)
else:
print "This line is not a tag:", l
return tags
def __handle_multivalues(self, line):
"""
Split multivalues like:
a nfo:Image, nmm:Photo ;
-> a nfo:Image ;
-> a nmm:Photo ;
"""
hasEscapedComma = re.compile ("\".+,.+\"")
if "," in line and not hasEscapedComma.search (line):
prop, multival = line.split (" ", 1)
results = []
for value in multival.split (","):
results.append ("%s %s" % (prop, value.strip ()))
return results
else:
return [line]
def __handle_anon_nodes(self, line):
"""
Traslates anonymous nodes in 'flat' properties:
nao:hasTag [a nao:Tag; nao:prefLabel "xxx"]
-> nao:hasTag:prefLabel "xxx"
slo:location [a slo:GeoLocation; slo:postalAddress <urn:uuid:1231-123> .]
-> slo:location <urn:uuid:1231-123>
nfo:hasMediaFileListEntry [ a nfo:MediaFileListEntry ; nfo:entryUrl "file://x.mp3"; nfo:listPosition 1]
-> nfo:hasMediaFileListEntry:entryUrl "file://x.mp3"
"""
# hasTag case
if line.startswith ("nao:hasTag"):
getlabel = re.compile ("nao:prefLabel\ \"([\w\ -]+)\"")
match = getlabel.search (line)
if (match):
line = 'nao:hasTag:prefLabel "%s" ;' % (match.group(1))
return [line]
else:
print "Whats wrong on line", line, "?"
return [line]
# location case
elif line.startswith ("slo:location"):
results = []
# Can have country AND/OR city
getpa = re.compile ("slo:postalAddress\ \<([\w:-]+)\>")
pa_match = getpa.search (line)
if (pa_match):
results.append ('slo:location:postalAddress "%s" ;' % (pa_match.group(1)))
else:
print "FIXME another location subproperty in ", line
return results
elif line.startswith ("nco:creator"):
getcreator = re.compile ("nco:fullname\ \"([\w\ ]+)\"")
creator_match = getcreator.search (line)
if (creator_match):
new_line = 'nco:creator:fullname "%s" ;' % (creator_match.group (1))
return [new_line]
else:
print "Something special in this line '%s'" % (line)
elif line.startswith ("nfo:hasMediaFileListEntry"):
return self.__handle_playlist_entries (line)
else:
return [line]
def __handle_playlist_entries(self, line):
"""
Playlist entries come in one big line:
nfo:hMFLE [ a nfo:MFLE; nfo:entryUrl '...'; nfo:listPosition X] , [ ... ], [ ... ]
-> nfo:hMFLE:entryUrl '...'
-> nfo:hMFLE:entryUrl '...'
...
"""
geturl = re.compile ("nfo:entryUrl \"([\w\.\:\/]+)\"")
entries = line.strip () [len ("nfo:hasMediaFileListEntry"):]
results = []
for entry in entries.split (","):
url_match = geturl.search (entry)
if (url_match):
new_line = 'nfo:hasMediaFileListEntry:entryUrl "%s" ;' % (url_match.group (1))
results.append (new_line)
else:
print " *** Something special in this line '%s'" % (entry)
return results
def __clean_value(self, value):
"""
the value comes with a ';' or a '.' at the end
"""
if (len (value) < 2):
return value.strip ()
clean = value.strip ()
if value[-1] in [';', '.']:
clean = value [:-1]
clean = clean.replace ("\"", "")
return clean.strip ()
def get_tracker_extract_output(filename, mime_type=None):
"""
Runs `tracker-extract --file` to extract metadata from a file.
"""
tracker_extract = os.path.join (cfg.EXEC_PREFIX, 'tracker-extract')
command = [tracker_extract, '--file', filename]
if mime_type is not None:
command.extend(['--mime', mime_type])
try:
log ('Running: %s' % ' '.join(command))
output = subprocess.check_output (command)
except subprocess.CalledProcessError as e:
raise Exception("Error %i from tracker-extract, output: %s" %
(e.returncode, e.output))
parser = ExtractorParser()
return parser.parse_tracker_extract_output(output)
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