root / pkpgcounter / trunk / pkpgpdls / plain.py @ 494

Revision 494, 3.0 kB (checked in by jerome, 16 years ago)

Improved plain text detection.

  • Property svn:eol-style set to native
  • Property svn:keywords set to Author Date Id Revision
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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 plain text documents."""
24
25import pdlparser
26import version
27
28class Parser(pdlparser.PDLParser) :
29    """A parser for plain text documents."""
30    totiffcommands = [ 'enscript --quiet --portrait --no-header --columns 1 --output - "%(infname)s" | gs -sDEVICE=tiff24nc -dPARANOIDSAFER -dNOPAUSE -dBATCH -dQUIET -r"%(dpi)i" -sOutputFile="%(outfname)s" -',
31                       'a2ps --borders 0 --quiet --portrait --no-header --columns 1 --output - "%(infname)s" | gs -sDEVICE=tiff24nc -dPARANOIDSAFER -dNOPAUSE -dBATCH -dQUIET -r"%(dpi)i" -sOutputFile="%(outfname)s" -',
32                     ] 
33    openmode = "rU"                 
34    def isValid(self) :   
35        """Returns True if data is plain text, else False.
36       
37           It's hard to detect a plain text file, so we just try to
38           extract lines from the first block (sufficiently large).
39           If it's impossible to find one we consider it's not plain text.
40        """   
41        lines = firstblock.split("\r\n")
42        if len(lines) == 1 :
43            lines = lines[0].split("\r")
44            if len(lines) == 1 :
45                lines = lines[0].split("\n")
46        if len(lines) > 1 :
47            self.logdebug("DEBUG: Input file seems to be in the plain text format.")
48            return True
49        else :   
50            return False
51           
52    def getJobSize(self) :
53        """Counts pages in a plain text document."""
54        pagesize = 66   # TODO : Does this vary wrt the default page size ?
55                        # TODO : /etc/papersize and /etc/paper.config
56        pagecount = 0
57        linecount = 0
58        for line in self.infile :
59            if line.endswith("\n") :
60                linecount += 1   
61                if (linecount > pagesize) :
62                    pagecount += 1
63                    linecount = 0
64                else :   
65                    cnt = line.count("\f")
66                    if cnt :
67                        pagecount += cnt
68                        linecount = 0
69            else :       
70                raise pdlparser.PDLParserError, "Unsupported file format. Please send the file to %s" % version.__authoremail__
71        return pagecount + 1    # NB : empty files are catched in isValid()
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