110 lines
4.0 KiB
Python
110 lines
4.0 KiB
Python
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#!/usr/bin/env python2
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import sys
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from psparser import LIT, KWD, STRICT
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from pdftypes import PDFObjectNotFound
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from pdftypes import resolve1
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from pdftypes import int_value, float_value, num_value
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from pdftypes import str_value, list_value, dict_value, stream_value
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# some predefined literals and keywords.
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LITERAL_PAGE = LIT('Page')
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LITERAL_PAGES = LIT('Pages')
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## PDFPage
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##
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class PDFPage(object):
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"""An object that holds the information about a page.
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A PDFPage object is merely a convenience class that has a set
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of keys and values, which describe the properties of a page
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and point to its contents.
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Attributes:
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doc: a PDFDocument object.
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pageid: any Python object that can uniquely identify the page.
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attrs: a dictionary of page attributes.
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contents: a list of PDFStream objects that represents the page content.
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lastmod: the last modified time of the page.
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resources: a list of resources used by the page.
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mediabox: the physical size of the page.
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cropbox: the crop rectangle of the page.
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rotate: the page rotation (in degree).
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annots: the page annotations.
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beads: a chain that represents natural reading order.
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"""
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def __init__(self, doc, pageid, attrs):
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"""Initialize a page object.
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doc: a PDFDocument object.
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pageid: any Python object that can uniquely identify the page.
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attrs: a dictionary of page attributes.
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"""
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self.doc = doc
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self.pageid = pageid
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self.attrs = dict_value(attrs)
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self.lastmod = resolve1(self.attrs.get('LastModified'))
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self.resources = resolve1(self.attrs['Resources'])
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self.mediabox = resolve1(self.attrs['MediaBox'])
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if 'CropBox' in self.attrs:
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self.cropbox = resolve1(self.attrs['CropBox'])
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else:
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self.cropbox = self.mediabox
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self.rotate = (self.attrs.get('Rotate', 0)+360) % 360
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self.annots = self.attrs.get('Annots')
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self.beads = self.attrs.get('B')
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if 'Contents' in self.attrs:
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contents = resolve1(self.attrs['Contents'])
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else:
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contents = []
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if not isinstance(contents, list):
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contents = [ contents ]
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self.contents = contents
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return
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def __repr__(self):
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return '<PDFPage: Resources=%r, MediaBox=%r>' % (self.resources, self.mediabox)
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INHERITABLE_ATTRS = set(['Resources', 'MediaBox', 'CropBox', 'Rotate'])
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@classmethod
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def create_pages(klass, document, debug=0):
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def search(obj, parent):
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if isinstance(obj, int):
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objid = obj
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tree = dict_value(document.getobj(objid)).copy()
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else:
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objid = obj.objid
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tree = dict_value(obj).copy()
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for (k,v) in parent.iteritems():
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if k in klass.INHERITABLE_ATTRS and k not in tree:
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tree[k] = v
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if tree.get('Type') is LITERAL_PAGES and 'Kids' in tree:
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if 1 <= debug:
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print >>sys.stderr, 'Pages: Kids=%r' % tree['Kids']
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for c in list_value(tree['Kids']):
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for x in search(c, tree):
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yield x
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elif tree.get('Type') is LITERAL_PAGE:
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if 1 <= debug:
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print >>sys.stderr, 'Page: %r' % tree
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yield (objid, tree)
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pages = False
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if 'Pages' in document.catalog:
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for (objid,tree) in search(document.catalog['Pages'], document.catalog):
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yield klass(document, objid, tree)
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pages = True
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if not pages:
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# fallback when /Pages is missing.
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for xref in document.xrefs:
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for objid in xref.get_objids():
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try:
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obj = document.getobj(objid)
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if isinstance(obj, dict) and obj.get('Type') is LITERAL_PAGE:
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yield klass(document, objid, obj)
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except PDFObjectNotFound:
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pass
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return
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