118 lines
4.5 KiB
Python
118 lines
4.5 KiB
Python
#################################
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# Copyright (C) 2014 J.F.Dockes
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the
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# Free Software Foundation, Inc.,
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# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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########################################################
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# Common code for replacing the old shell scripts with Python execm
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# ones: this implements the basic functions for a filter which
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# executes a command to translate a simple file (like rclword with
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# antiword).
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#
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# This was motivated by the Windows port: to replace shell and Unix
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# utility (awk , etc usage). We can't just execute python scripts,
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# this would be to slow. So this helps implementing a permanent script
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# to repeatedly execute single commands.
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import subprocess
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import rclexecm
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from rclbasehandler import RclBaseHandler
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# This class has the code to execute the subprocess and call a
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# data-specific post-processor. Command and processor are supplied by
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# the object which we receive as a parameter, which in turn is defined
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# in the actual executable filter (e.g. rcldoc.py)
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class Executor(RclBaseHandler):
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opt_ignxval = 1
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def __init__(self, em, flt):
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super(Executor, self).__init__(em)
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self.flt = flt
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def runCmd(self, cmd, filename, postproc, opt):
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''' Substitute parameters and execute command, process output
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with the specific postprocessor and return the complete text.
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We expect cmd as a list of command name + arguments, except that, for
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the special value "cat", we just read the file'''
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if cmd == "cat":
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try:
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data = open(filename, 'rb').read()
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ok = True
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except Exception as err:
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self.em.rclog("runCmd: error reading %s: %s"%(filename, err))
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return(False, "")
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for line in data.split(b'\n'):
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postproc.takeLine(line)
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return True, postproc.wrapData()
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else:
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try:
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fullcmd = cmd + [rclexecm.subprocfile(filename)]
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proc = subprocess.Popen(fullcmd,
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stdout = subprocess.PIPE)
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stdout = proc.stdout
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except subprocess.CalledProcessError as err:
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self.em.rclog("extractone: Popen(%s) error: %s" % (fullcmd, err))
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return (False, "")
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except OSError as err:
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self.em.rclog("extractone: Popen(%s) OS error: %s" %
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(fullcmd, err))
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return (False, "")
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try:
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for line in stdout:
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postproc.takeLine(line.strip())
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except:
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return (False, "")
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proc.wait()
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try:
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data = postproc.wrapData()
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except:
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return (False, "")
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if (opt & self.opt_ignxval) == 0 and proc.returncode:
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self.em.rclog("extractone: [%s] returncode %d" % \
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(filename, proc.returncode))
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return False, data
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else:
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return True, data
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def extractone(self, params):
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#self.em.rclog("extractone %s %s" % (params["filename"], \
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# params["mimetype"]))
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self.flt.reset()
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ok = False
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if not "filename" in params:
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self.em.rclog("extractone: no file name")
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return (ok, "", "", rclexecm.RclExecM.eofnow)
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fn = params["filename"]
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while True:
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cmdseq = self.flt.getCmd(fn)
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cmd = cmdseq[0]
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postproc = cmdseq[1]
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opt = cmdseq[2] if len(cmdseq) == 3 else 0
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if cmd:
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ok, data = self.runCmd(cmd, fn, postproc, opt)
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if ok:
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break
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else:
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break
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if ok:
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return (ok, data, "", rclexecm.RclExecM.eofnext)
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else:
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return (ok, "", "", rclexecm.RclExecM.eofnow)
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