/usr/lib/python2.7/dist-packages/reportlab/pdfbase/pdfpattern.py is in python-reportlab 3.0-1build1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 | __doc__="""helper for importing pdf structures into a ReportLab generated document
"""
from reportlab.pdfbase.pdfdoc import format, PDFObject, pdfdocEnc
from reportlab.lib.utils import strTypes
class PDFPattern(PDFObject):
__RefOnly__ = 1
def __init__(self, pattern_sequence, **keywordargs):
"""
Description of a kind of PDF object using a pattern.
Pattern sequence should contain strings or singletons of form [string].
Strings are literal strings to be used in the object.
Singletons are names of keyword arguments to include.
Keyword arguments can be non-instances which are substituted directly in string conversion,
or they can be object instances in which case they should be pdfdoc.* style
objects with a x.format(doc) method.
Keyword arguments may be set on initialization or subsequently using __setitem__, before format.
"constant object" instances can also be inserted in the patterns.
"""
self.pattern = pattern_sequence
self.arguments = keywordargs
for x in pattern_sequence:
if not isinstance(x,strTypes) and not isinstance(x,PDFObject):
if len(x)!=1:
raise ValueError("sequence elts must be strings/bytes or singletons containing strings: "+ascii(x))
if not isinstance(x[0],strTypes):
raise ValueError("Singletons must contain strings/bytes or PDFObject instances only: "+ascii(x[0]))
def __setitem__(self, item, value):
self.arguments[item] = value
def __getitem__(self, item):
return self.arguments[item]
def format(self, document):
L = []
arguments = self.arguments
for x in self.pattern:
if isinstance(x,strTypes):
L.append(pdfdocEnc(x))
elif isinstance(x,PDFObject):
L.append(x.format(document))
else:
name = x[0]
value = arguments.get(name, None)
if value is None:
raise ValueError("%s value not defined" % ascii(name))
if isinstance(value,PDFObject):
L.append(format(value,document))
elif isinstance(value,strTypes):
L.append(pdfdocEnc(value))
else:
L.append(pdfdocEnc(str(value)))
return b"".join(L)
|