py_ext/py_ext.py
author Edouard Tisserant
Mon, 20 Nov 2023 11:51:34 +0100
changeset 3856 054c4f1b2ea7
parent 3707 3c60c78dfa5d
child 3750 f62625418bff
permissions -rw-r--r--
Runtime WebSetings for extensions are now served on individual URLs to prevent cluttering.
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#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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# This file is part of Beremiz, a Integrated Development Environment for
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# programming IEC 61131-3 automates supporting plcopen standard and CanFestival.
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#
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# Copyright (C) 2007: Edouard TISSERANT and Laurent BESSARD
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# Copyright (C) 2017: Andrey Skvortsov
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#
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# See COPYING file for copyrights details.
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation; either version 2
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# of the License, or (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 Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
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from __future__ import absolute_import
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import os
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from POULibrary import POULibrary
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from py_ext.PythonFileCTNMixin import PythonFileCTNMixin
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import util.paths as paths
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pyext_python_lib_code = """
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import csv
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from collections import OrderedDict
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csv_int_files = {}
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def CSVRdInt(fname, rowidx, colidx):
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    \"\"\"
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    Return value at row/column pointed by integer indexes
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    Assumes data starts at first row and first column, no headers.
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    \"\"\"
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    global csv_int_files
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    data = csv_int_files.get(fname, None)
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    if data is None:
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        data = list()
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        try:
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            csvfile = open(fname, 'rb')
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        except IOError:
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            return "#FILE_NOT_FOUND"
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        try:
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            dialect = csv.Sniffer().sniff(csvfile.read(1024))
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            csvfile.seek(0)
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            reader = csv.reader(csvfile, dialect)
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            for row in reader:
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                data.append(row)
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        except csv.Error:
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            return "#CSV_ERROR"
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        finally:
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            csvfile.close()
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        csv_int_files[fname] = data
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    try:
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        row = data[rowidx]
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    except IndexError:
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        return "#ROW_NOT_FOUND"
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    try:
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        return row[colidx]
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    except IndexError:
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        return "#COL_NOT_FOUND"
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csv_str_files = {}
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def CSVRdStr(fname, rowname, colname):
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    \"\"\"
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    Return value at row/column pointed by a pair of names as string
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    Assumes first row is column headers and first column is row name.
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    \"\"\"
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    global csv_str_files
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    entry = csv_str_files.get(fname, None)
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    if entry is None:
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        data = dict()
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        try:
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            csvfile = open(fname, 'rb')
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        except IOError:
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            return "#FILE_NOT_FOUND"
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        try:
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            dialect = csv.Sniffer().sniff(csvfile.read(1024))
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            csvfile.seek(0)
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            reader = csv.reader(csvfile, dialect)
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            headers = dict([(name, index) for index, name in enumerate(reader.next()[1:])])
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            for row in reader:
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                data[row[0]] = row[1:]
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        except csv.Error:
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            return "#CSV_ERROR"
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        finally:
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            csvfile.close()
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        csv_str_files[fname] = (headers, data)
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    else:
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        headers, data = entry
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    try:
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        row = data[rowname]
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    except KeyError:
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        return "#ROW_NOT_FOUND"
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    try:
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        colidx = headers[colname]
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    except KeyError:
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        return "#COL_NOT_FOUND"
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    try:
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        return row[colidx]
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    except IndexError:
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        return "#COL_NOT_FOUND"
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def pyext_csv_reload():
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    global csv_int_files, csv_str_files
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    csv_int_files.clear()
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    csv_str_files.clear()
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"""
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class PythonLibrary(POULibrary):
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    def GetLibraryPath(self):
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        return paths.AbsNeighbourFile(__file__, "pous.xml")
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    def Generate_C(self, buildpath, varlist, IECCFLAGS):
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        plc_python_filepath = paths.AbsNeighbourFile(__file__, "plc_python.c")
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        plc_python_file = open(plc_python_filepath, 'r')
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        plc_python_code = plc_python_file.read()
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        plc_python_file.close()
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        python_eval_fb_list = []
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        for v in varlist:
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            if v["vartype"] == "FB" and v["type"] in ["PYTHON_EVAL",
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                                                      "PYTHON_POLL"]:
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                python_eval_fb_list.append(v)
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        python_eval_fb_count = max(1, len(python_eval_fb_list))
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        # prepare python code
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        plc_python_code = plc_python_code % {
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            "python_eval_fb_count": python_eval_fb_count}
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        Gen_Pythonfile_path = os.path.join(buildpath, "py_ext.c")
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        pythonfile = open(Gen_Pythonfile_path, 'w')
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        pythonfile.write(plc_python_code)
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        pythonfile.close()
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        runtimefile_path = os.path.join(buildpath, "runtime_00_pyext.py")
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        runtimefile = open(runtimefile_path, 'w')
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        runtimefile.write(pyext_python_lib_code)
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        runtimefile.close()
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        return ((["py_ext"], [(Gen_Pythonfile_path, IECCFLAGS)], True), "",
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                ("runtime_00_pyext.py", open(runtimefile_path, "rb")))
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class PythonFile(PythonFileCTNMixin):
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    def GetIconName(self):
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        return "Pyfile"