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# DpkgControl.py
#
# This module implements control file parsing.
#
# DpkgParagraph is a low-level class, that reads/parses a single paragraph
# from a file object.
#
# DpkgControl uses DpkgParagraph in a loop, pulling out the value of a
# defined key(package), and using that as a key in it's internal
# dictionary.
#
# DpkgSourceControl grabs the first paragraph from the file object, stores
# it in object.source, then passes control to DpkgControl.load, to parse
# the rest of the file.
#
# To test this, pass it a filetype char, a filename, then, optionally,
# the key to a paragraph to display, and if a fourth arg is given, only
# show that field.
#
# Copyright 2001 Adam Heath <doogie@debian.org>
#
# This file 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
import re, string
from DpkgDatalist import *
from minidinstall.SignedFile import *
from types import ListType
class DpkgParagraph(DpkgOrderedDatalist):
caseSensitive = 0
trueFieldCasing = {}
def setCaseSensitive( self, value ): self.caseSensitive = value
def load( self, f ):
"Paragraph data from a file object."
key = None
value = None
while 1:
line = f.readline()
if not line:
return
# skip blank lines until we reach a paragraph
if line == '\n':
if not self:
continue
else:
return
line = line[ :-1 ]
if line[ 0 ] != ' ':
key, value = string.split( line, ":", 1 )
if value: value = value[ 1: ]
if not self.caseSensitive:
newkey = string.lower( key )
if not self.trueFieldCasing.has_key( key ):
self.trueFieldCasing[ newkey ] = key
key = newkey
else:
if isinstance( value, ListType ):
value.append( line[ 1: ] )
else:
value = [ value, line[ 1: ] ]
self[ key ] = value
def _storeField( self, f, value, lead = " " ):
if isinstance( value, ListType ):
value = string.join( map( lambda v, lead = lead: v and ( lead + v ) or v, value ), "\n" )
else:
if value: value = lead + value
f.write( "%s\n" % ( value ) )
def _store( self, f ):
"Write our paragraph data to a file object"
for key in self.keys():
value = self[ key ]
if self.trueFieldCasing.has_key( key ):
key = self.trueFieldCasing[ key ]
f.write( "%s:" % key )
self._storeField( f, value )
class DpkgControl(DpkgOrderedDatalist):
key = "package"
caseSensitive = 0
def setkey( self, key ): self.key = key
def setCaseSensitive( self, value ): self.caseSensitive = value
def _load_one( self, f ):
p = DpkgParagraph( None )
p.setCaseSensitive( self.caseSensitive )
p.load( f )
return p
def load( self, f ):
while 1:
p = self._load_one( f )
if not p: break
self[ p[ self.key ] ] = p
def _store( self, f ):
"Write our control data to a file object"
for key in self.keys():
self[ key ]._store( f )
f.write( "\n" )
class DpkgSourceControl( DpkgControl ):
source = None
def load( self, f ):
f = SignedFile(f)
self.source = self._load_one( f )
DpkgControl.load( self, f )
def __repr__( self ):
return self.source.__repr__() + "\n" + DpkgControl.__repr__( self )
def _store( self, f ):
"Write our control data to a file object"
self.source._store( f )
f.write( "\n" )
DpkgControl._store( self, f )
if __name__ == "__main__":
import sys
types = { 'p' : DpkgParagraph, 'c' : DpkgControl, 's' : DpkgSourceControl }
type = sys.argv[ 1 ]
if not types.has_key( type ):
print "Unknown type `%s'!" % type
sys.exit( 1 )
file = open( sys.argv[ 2 ], "r" )
data = types[ type ]()
data.load( file )
if len( sys.argv ) > 3:
para = data[ sys.argv[ 3 ] ]
if len( sys.argv ) > 4:
para._storeField( sys.stdout, para[ sys.argv[ 4 ] ], "" )
else:
para._store( sys.stdout )
else:
data._store( sys.stdout )
# vim:ts=4:sw=4:et:
|
