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"""Manipulate pdf and fdf files (pdftk recommended).
Notes regarding pdftk, pdf forms and fdf files (form definition file)
fields names can be extracted with:
pdftk orig.pdf generate_fdf output truc.fdf
to merge fdf and pdf:
pdftk orig.pdf fill_form test.fdf output result.pdf [flatten]
without flatten, one could further edit the resulting form.
with flatten, everything is turned into text.
:copyright: 2000-2008 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
:license: General Public License version 2 - http://www.gnu.org/licenses
"""
__docformat__ = "restructuredtext en"
# XXX seems very unix specific
# TODO: check availability of pdftk at import
import os
HEAD="""%FDF-1.2
%\xE2\xE3\xCF\xD3
1 0 obj
<<
/FDF
<<
/Fields [
"""
TAIL="""]
>>
>>
endobj
trailer
<<
/Root 1 0 R
>>
%%EOF
"""
def output_field( f ):
return "\xfe\xff" + "".join( [ "\x00"+c for c in f ] )
def extract_keys(lines):
keys = []
for line in lines:
if line.startswith('/V'):
pass #print 'value',line
elif line.startswith('/T'):
key = line[7:-2]
key = ''.join(key.split('\x00'))
keys.append( key )
return keys
def write_field(out, key, value):
out.write("<<\n")
if value:
out.write("/V (%s)\n" %value)
else:
out.write("/V /\n")
out.write("/T (%s)\n" % output_field(key) )
out.write(">> \n")
def write_fields(out, fields):
out.write(HEAD)
for (key,value,comment) in fields:
write_field(out, key, value)
write_field(out, key+"a", value) # pour copie-carbone sur autres pages
out.write(TAIL)
def extract_keys_from_pdf(filename):
# what about using 'pdftk filename dump_data_fields' and parsing the output ?
os.system('pdftk %s generate_fdf output /tmp/toto.fdf' % filename)
lines = file('/tmp/toto.fdf').readlines()
return extract_keys(lines)
def fill_pdf(infile, outfile, fields):
write_fields(file('/tmp/toto.fdf', 'w'), fields)
os.system('pdftk %s fill_form /tmp/toto.fdf output %s flatten' % (infile, outfile))
def testfill_pdf(infile, outfile):
keys = extract_keys_from_pdf(infile)
fields = []
for key in keys:
fields.append( (key, key, '') )
fill_pdf(infile, outfile, fields)
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