py_ext/PythonFileCTNMixin.py
author Edouard Tisserant
Wed, 31 Jul 2013 10:45:07 +0900
branch1.1 Korean release
changeset 1280 72a826dfcfbb
parent 1160 e9e9d3193894
child 1315 ff14a66bbd12
permissions -rw-r--r--
RC4
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import os
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from PLCControler import UndoBuffer
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from PythonEditor import PythonEditor
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from xml.dom import minidom
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from xmlclass import GenerateClassesFromXSD
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import cPickle
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from CodeFileTreeNode import CodeFile
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PythonClasses = GenerateClassesFromXSD(os.path.join(os.path.dirname(__file__), "py_ext_xsd.xsd")) 
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class PythonFileCTNMixin(CodeFile):
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    CODEFILE_NAME = "PyFile"
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    SECTIONS_NAMES = [
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        "globals",
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        "init",
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        "cleanup",
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        "start",
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        "stop"]
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    EditorType = PythonEditor
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    def __init__(self):
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        CodeFile.__init__(self)
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        filepath = self.PythonFileName()
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        python_code = PythonClasses["Python"]()
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        if os.path.isfile(filepath):
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            xmlfile = open(filepath, 'r')
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            tree = minidom.parse(xmlfile)
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            xmlfile.close()
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            for child in tree.childNodes:
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                if child.nodeType == tree.ELEMENT_NODE and child.nodeName == "Python":
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                    python_code.loadXMLTree(child, ["xmlns", "xmlns:xsi", "xsi:schemaLocation"])
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                    self.CodeFile.globals.settext(python_code.gettext())
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                    os.remove(filepath)
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                    self.CreateCodeFileBuffer(False)
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                    self.OnCTNSave()
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    def CodeFileName(self):
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        return os.path.join(self.CTNPath(), "pyfile.xml")
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    def PythonFileName(self):
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        return os.path.join(self.CTNPath(), "py_ext.xml")
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    PreSectionsTexts = {}
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    PostSectionsTexts = {}
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    def GetSection(self,section):
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        return self.PreSectionsTexts.get(section,"") + "\n" + \
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               getattr(self.CodeFile, section).gettext() + "\n" + \
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               self.PostSectionsTexts.get(section,"")
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    def CTNGenerate_C(self, buildpath, locations):
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        # location string for that CTN 
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        location_str = "_".join(map(lambda x:str(x), 
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                                self.GetCurrentLocation()))
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        configname = self.GetCTRoot().GetProjectConfigNames()[0]
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        # python side PLC global variables access stub
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        globalstubs = "\n".join(["""\
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_%(name)s_ctype, _%(name)s_unpack, _%(name)s_pack = \\
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    TypeTranslator["%(IECtype)s"]
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_PySafeGetPLCGlob_%(name)s = PLCBinary.__SafeGetPLCGlob_%(name)s
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_PySafeGetPLCGlob_%(name)s.restype = None
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_PySafeGetPLCGlob_%(name)s.argtypes = [ctypes.POINTER(_%(name)s_ctype)] 
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_PySafeSetPLCGlob_%(name)s = PLCBinary.__SafeSetPLCGlob_%(name)s
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_PySafeSetPLCGlob_%(name)s.restype = None
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_PySafeSetPLCGlob_%(name)s.argtypes = [ctypes.POINTER(_%(name)s_ctype)]
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""" % { "name": variable.getname(),
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        "configname": configname.upper(),
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        "uppername": variable.getname().upper(),
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        "IECtype": variable.gettype()}
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            for variable in self.CodeFile.variables.variable])
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        # Runtime calls (start, stop, init, and cleanup)
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        rtcalls = ""
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        for section in self.SECTIONS_NAMES:
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            if section != "globals":
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                rtcalls += "def _runtime_%s_%s():\n" % (location_str, section)
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                sectiontext = self.GetSection(section).strip()
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                if sectiontext:
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                    rtcalls += '    ' + \
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                        sectiontext.replace('\n', '\n    ')+"\n\n"
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                else:
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                    rtcalls += "    pass\n\n"
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        globalsection = self.GetSection("globals")      
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        PyFileContent = """\
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#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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## Code generated by Beremiz python mixin confnode
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##        
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## Code for PLC global variable access
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from targets.typemapping import TypeTranslator
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import ctypes 
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%(globalstubs)s
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## User code in "global" scope
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%(globalsection)s
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## Beremiz python runtime calls
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%(rtcalls)s
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""" % locals()
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        # write generated content to python file
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        runtimefile_path = os.path.join(buildpath, 
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            "runtime_%s.py"%location_str)
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        runtimefile = open(runtimefile_path, 'w')
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        runtimefile.write(PyFileContent.encode('utf-8'))
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        runtimefile.close()
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        # C code for safe global variables access
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        vardecfmt = """\
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extern  __IEC_%(IECtype)s_t %(configname)s__%(uppername)s;
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IEC_%(IECtype)s __%(name)s_rbuffer = __INIT_%(IECtype)s;
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IEC_%(IECtype)s __%(name)s_wbuffer;
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long __%(name)s_rlock = 0;
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long __%(name)s_wlock = 0;
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int __%(name)s_wbuffer_written = 0;
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void __SafeGetPLCGlob_%(name)s(IEC_%(IECtype)s *pvalue){
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    while(AtomicCompareExchange(&__%(name)s_rlock, 0, 1));
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    *pvalue = __%(name)s_rbuffer;
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    AtomicCompareExchange((long*)&__%(name)s_rlock, 1, 0);
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}
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void __SafeSetPLCGlob_%(name)s(IEC_%(IECtype)s *value){
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    while(AtomicCompareExchange(&__%(name)s_wlock, 0, 1));
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    __%(name)s_wbuffer = *value;
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    __%(name)s_wbuffer_written = 1;
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    AtomicCompareExchange((long*)&__%(name)s_wlock, 1, 0);
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}
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"""
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        varretfmt = """\
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    if(!AtomicCompareExchange(&__%(name)s_wlock, 0, 1)){
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        if(__%(name)s_wbuffer_written == 1){
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            %(configname)s__%(uppername)s.value = __%(name)s_wbuffer;
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            __%(name)s_wbuffer_written = 0;
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        }
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        AtomicCompareExchange((long*)&__%(name)s_wlock, 1, 0);
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    }
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""" 
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        varpubfmt = """\
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    if(!AtomicCompareExchange(&__%(name)s_rlock, 0, 1)){
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        __%(name)s_rbuffer = %(configname)s__%(uppername)s.value;
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        AtomicCompareExchange((long*)&__%(name)s_rlock, 1, 0);
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    }
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""" 
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        var_str = map("\n".join, zip(*[
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            map(lambda f : f % varinfo,
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                (vardecfmt, varretfmt, varpubfmt))
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                for varinfo in map(lambda variable : {
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                    "name": variable.getname(),
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                    "configname": configname.upper(),
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                    "uppername": variable.getname().upper(),
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                    "IECtype": variable.gettype()},
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                    self.CodeFile.variables.variable)]))
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        if len(var_str) > 0:
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            vardec, varret, varpub = var_str
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        else:
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            vardec = varret = varpub = ""
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        PyCFileContent = """\
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/* 
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 * Code generated by Beremiz py_ext confnode 
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 * for safe global variables access
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 */
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#include "iec_types_all.h"
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#include "beremiz.h"
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/* User variables reference */
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%(vardec)s
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/* Beremiz confnode functions */
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int __init_%(location_str)s(int argc,char **argv){
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    return 0;
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}
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void __cleanup_%(location_str)s(void){
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}
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void __retrieve_%(location_str)s(void){
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%(varret)s
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}
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void __publish_%(location_str)s(void){
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%(varpub)s
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}
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""" % locals()
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        Gen_PyCfile_path = os.path.join(buildpath, "PyCFile_%s.c"%location_str)
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        pycfile = open(Gen_PyCfile_path,'w')
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        pycfile.write(PyCFileContent)
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        pycfile.close()
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        matiec_flags = '"-I%s"'%os.path.abspath(
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            self.GetCTRoot().GetIECLibPath())
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        return ([(Gen_PyCfile_path, matiec_flags)],
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                "",
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                True,
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                ("runtime_%s.py"%location_str, file(runtimefile_path,"rb")))
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