root / pkpgcounter / trunk / pkpgpdls / escp2.py @ 555

Revision 555, 2.6 kB (checked in by jerome, 16 years ago)

Each parser now has a 'format' attribute containing its short name.

  • Property svn:eol-style set to native
  • Property svn:keywords set to Auth Date Id Rev
Line 
1#! /usr/bin/env python
2# -*- coding: ISO-8859-15 -*-
3#
4# pkpgcounter : a generic Page Description Language parser
5#
6# (c) 2003, 2004, 2005, 2006, 2007 Jerome Alet <alet@librelogiciel.com>
7# This program is free software: you can redistribute it and/or modify
8# it under the terms of the GNU General Public License as published by
9# the Free Software Foundation, either version 3 of the License, or
10# (at your option) any later version.
11#
12# This program is distributed in the hope that it will be useful,
13# but WITHOUT ANY WARRANTY; without even the implied warranty of
14# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15# GNU General Public License for more details.
16#
17# You should have received a copy of the GNU General Public License
18# along with this program.  If not, see <http://www.gnu.org/licenses/>.
19#
20# $Id$
21#
22
23"""This modules implements a page counter for ESC/P2 documents."""
24
25import sys
26
27import pdlparser
28
29class Parser(pdlparser.PDLParser) :
30    """A parser for ESC/P2 documents."""
31    format = "ESC/P2"
32    def isValid(self) :       
33        """Returns True if data is ESC/P2, else False."""
34        if self.firstblock.startswith("\033@") or \
35           self.firstblock.startswith("\033*") or \
36           self.firstblock.startswith("\n\033@") or \
37           self.firstblock.startswith("\0\0\0\033\1@EJL") : # ESC/P Raster ??? Seen on Stylus Photo 1284
38            return True
39        else :   
40            return False
41           
42    def getJobSize(self) :   
43        """Counts pages in an ESC/P2 document."""
44        # with Gimpprint, at least, for each page there
45        # are two Reset Printer sequences (ESC + @)
46        marker1 = "\033@"
47       
48        # with other software or printer driver, we
49        # may prefer to search for "\r\n\fESCAPE"
50        # or "\r\fESCAPE"
51        marker2r = "\r\f\033"
52        marker2rn = "\r\n\f\033"
53       
54        # and ghostscript's stcolor for example seems to
55        # output ESC + @ + \f for each page plus one
56        marker3 = "\033@\f"
57       
58        # while ghostscript's escp driver outputs instead
59        # \f + ESC + @
60        marker4 = "\f\033@"
61       
62        data = self.infile.read()
63        pagecount1 = data.count(marker1)
64        pagecount2 = max(data.count(marker2r), data.count(marker2rn))
65        pagecount3 = data.count(marker3)
66        pagecount4 = data.count(marker4)
67           
68        if pagecount2 :   
69            return pagecount2
70        elif pagecount3 > 1 :     
71            return pagecount3 - 1
72        elif pagecount4 :   
73            return pagecount4
74        else :   
75            return int(pagecount1 / 2)       
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