[192] | 1 | # |
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| 2 | # pkpgcounter : a generic Page Description Language parser |
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| 3 | # |
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[443] | 4 | # (c) 2003, 2004, 2005, 2006, 2007 Jerome Alet <alet@librelogiciel.com> |
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[463] | 5 | # This program is free software: you can redistribute it and/or modify |
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[192] | 6 | # it under the terms of the GNU General Public License as published by |
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[463] | 7 | # the Free Software Foundation, either version 3 of the License, or |
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[192] | 8 | # (at your option) any later version. |
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[463] | 9 | # |
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[192] | 10 | # This program is distributed in the hope that it will be useful, |
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| 11 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 13 | # GNU General Public License for more details. |
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| 14 | # |
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| 15 | # You should have received a copy of the GNU General Public License |
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[463] | 16 | # along with this program. If not, see <http://www.gnu.org/licenses/>. |
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[192] | 17 | # |
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| 18 | # $Id$ |
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| 19 | # |
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| 20 | |
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[360] | 21 | """This module defines the base class for all Page Description Language parsers.""" |
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| 22 | |
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[199] | 23 | import sys |
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[428] | 24 | import os |
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[199] | 25 | |
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[220] | 26 | KILOBYTE = 1024 |
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| 27 | MEGABYTE = 1024 * KILOBYTE |
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| 28 | FIRSTBLOCKSIZE = 16 * KILOBYTE |
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| 29 | LASTBLOCKSIZE = int(KILOBYTE / 4) |
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| 30 | |
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[193] | 31 | class PDLParserError(Exception): |
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| 32 | """An exception for PDLParser related stuff.""" |
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| 33 | def __init__(self, message = ""): |
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| 34 | self.message = message |
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| 35 | Exception.__init__(self, message) |
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| 36 | def __repr__(self): |
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| 37 | return self.message |
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| 38 | __str__ = __repr__ |
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| 39 | |
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[192] | 40 | class PDLParser : |
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| 41 | """Generic PDL parser.""" |
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[527] | 42 | totiffcommands = None # Default command to convert to TIFF |
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| 43 | required = [] # Default list of required commands |
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| 44 | openmode = "rb" # Default file opening mode |
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[529] | 45 | def __init__(self, parent, filename, (firstblock, lastblock)) : |
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[192] | 46 | """Initialize the generic parser.""" |
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[520] | 47 | self.parent = parent |
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[522] | 48 | # We need some copies for later inclusion of parsers which |
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| 49 | # would modify the parent's values |
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[529] | 50 | self.filename = filename[:] |
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[522] | 51 | self.firstblock = firstblock[:] |
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| 52 | self.lastblock = lastblock[:] |
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[491] | 53 | self.infile = None |
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[220] | 54 | if not self.isValid() : |
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| 55 | raise PDLParserError, "Invalid file format !" |
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| 56 | try : |
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| 57 | import psyco |
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| 58 | except ImportError : |
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| 59 | pass # Psyco is not installed |
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| 60 | else : |
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| 61 | # Psyco is installed, tell it to compile |
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| 62 | # the CPU intensive methods : PCL and PCLXL |
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[432] | 63 | # parsing will greatly benefit from this. |
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[220] | 64 | psyco.bind(self.getJobSize) |
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[522] | 65 | self.infile = open(self.filename, self.openmode) |
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| 66 | # self.logdebug("Opened %s in '%s' mode." % (self.filename, self.openmode)) |
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[220] | 67 | |
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[491] | 68 | def __del__(self) : |
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| 69 | """Ensures the input file gets closed.""" |
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| 70 | if self.infile : |
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| 71 | self.infile.close() |
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| 72 | |
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[527] | 73 | def findExecutable(self, command) : |
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| 74 | """Finds an executable in the PATH and returns True if found else False.""" |
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| 75 | for cmd in [p.strip() for p in command.split("|")] : # | can separate alternatives for similar commands (e.g. a2ps|enscript) |
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| 76 | for path in os.environ.get("PATH", "").split(":") : |
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| 77 | fullname = os.path.abspath(os.path.join(os.path.expanduser(path), cmd)) |
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| 78 | if os.path.isfile(fullname) and os.access(fullname, os.X_OK) : |
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| 79 | return True |
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| 80 | return False |
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| 81 | |
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| 82 | def isMissing(self, commands) : |
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| 83 | """Returns True if some required commands are missing, else False.""" |
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| 84 | howmanythere = 0 |
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| 85 | for command in commands : |
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| 86 | if not self.findExecutable(command) : |
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| 87 | sys.stderr.write("ERROR: %(command)s is missing or not executable. You MUST install it for pkpgcounter to be able to do what you want.\n" % locals()) |
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| 88 | sys.stderr.flush() |
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| 89 | else : |
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| 90 | howmanythere += 1 |
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| 91 | if howmanythere == len(commands) : |
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| 92 | return False |
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| 93 | else : |
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| 94 | return True |
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| 95 | |
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[252] | 96 | def logdebug(self, message) : |
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| 97 | """Logs a debug message if needed.""" |
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[520] | 98 | if self.parent.options.debug : |
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[252] | 99 | sys.stderr.write("%s\n" % message) |
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| 100 | |
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[220] | 101 | def isValid(self) : |
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[387] | 102 | """Returns True if data is in the expected format, else False.""" |
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[192] | 103 | raise RuntimeError, "Not implemented !" |
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[220] | 104 | |
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| 105 | def getJobSize(self) : |
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| 106 | """Counts pages in a document.""" |
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| 107 | raise RuntimeError, "Not implemented !" |
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[362] | 108 | |
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[492] | 109 | def convertToTiffMultiPage24NC(self, outfname, dpi) : |
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[362] | 110 | """Converts the input file to TIFF format, X dpi, 24 bits per pixel, uncompressed. |
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[492] | 111 | Writes TIFF datas to the file named by outfname. |
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[362] | 112 | """ |
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[428] | 113 | if self.totiffcommands : |
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[527] | 114 | if self.isMissing(self.required) : |
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| 115 | raise PDLParserError, "At least one of the following commands is missing and should be installed for the computation of ink coverage : %s" % repr(self.required) |
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[522] | 116 | infname = self.filename |
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[492] | 117 | for totiffcommand in self.totiffcommands : |
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| 118 | error = False |
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| 119 | commandline = totiffcommand % locals() |
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| 120 | # self.logdebug("Executing '%s'" % commandline) |
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| 121 | status = os.system(commandline) |
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| 122 | if os.WIFEXITED(status) : |
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| 123 | if os.WEXITSTATUS(status) : |
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[428] | 124 | error = True |
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[492] | 125 | else : |
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| 126 | error = True |
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| 127 | if not os.path.exists(outfname) : |
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| 128 | error = True |
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| 129 | elif not os.stat(outfname).st_size : |
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| 130 | error = True |
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| 131 | else : |
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| 132 | break # Conversion worked fine it seems. |
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| 133 | sys.stderr.write("Command failed : %s\n" % repr(commandline)) |
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[428] | 134 | if error : |
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| 135 | raise PDLParserError, "Problem during conversion to TIFF." |
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[371] | 136 | else : |
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| 137 | raise PDLParserError, "Impossible to compute ink coverage for this file format." |
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