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from PythonEditor import PythonEditor

     8

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class PythonFileCTNMixin(CodeFile):

    10

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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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        if os.path.isfile(filepath):

    29

            xmlfile = open(filepath, 'r')

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            xmlfile.close()

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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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               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);

   137

}

   138

void __SafeSetPLCGlob_%(name)s(IEC_%(IECtype)s *value){

   139

    while(AtomicCompareExchange(&__%(name)s_wlock, 0, 1));

   140

    __%(name)s_wbuffer = *value;

   141

    __%(name)s_wbuffer_written = 1;

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    AtomicCompareExchange((long*)&__%(name)s_wlock, 1, 0);

   143

}

   144

   145

"""

   146

        varretfmt = """\

   147

    if(!AtomicCompareExchange(&__%(name)s_wlock, 0, 1)){

   148

        if(__%(name)s_wbuffer_written == 1){

   149

            %(configname)s__%(uppername)s.value = __%(name)s_wbuffer;

   150

            __%(name)s_wbuffer_written = 0;

   151

        }

   152

        AtomicCompareExchange((long*)&__%(name)s_wlock, 1, 0);

   153

    }

   154

""" 

   155

        varpubfmt = """\

   156

    if(!AtomicCompareExchange(&__%(name)s_rlock, 0, 1)){

   157

        __%(name)s_rbuffer = %(configname)s__%(uppername)s.value;

   158

        AtomicCompareExchange((long*)&__%(name)s_rlock, 1, 0);

   159

    }

   160

""" 

   161

   162

        var_str = map("\n".join, zip(*[

   163

            map(lambda f : f % varinfo,

   164

                (vardecfmt, varretfmt, varpubfmt))

   165

                for varinfo in map(lambda variable : {

   166

                    "name": variable.getname(),

   167

                    "configname": configname.upper(),

   168

                    "uppername": variable.getname().upper(),

   169

                    "IECtype": variable.gettype()},

   170

                    self.CodeFile.variables.variable)]))

   171

        if len(var_str) > 0:

   172

            vardec, varret, varpub = var_str

   173

        else:

   174

            vardec = varret = varpub = ""

   175

   176

        PyCFileContent = """\

   177

/* 

   178

 * Code generated by Beremiz py_ext confnode 

   179

 * for safe global variables access

   180

 */

   181

#include "iec_types_all.h"

   182

#include "beremiz.h"

   183

   184

/* User variables reference */

   185

%(vardec)s

   186

   187

/* Beremiz confnode functions */

   188

int __init_%(location_str)s(int argc,char **argv){

   189

    return 0;

   190

}

   191

   192

void __cleanup_%(location_str)s(void){

   193

}

   194

   195

void __retrieve_%(location_str)s(void){

   196

%(varret)s

   197

}

   198

   199

void __publish_%(location_str)s(void){

   200

%(varpub)s

   201

}

   202

""" % locals()

   203

   204

        Gen_PyCfile_path = os.path.join(buildpath, "PyCFile_%s.c"%location_str)

   205

        pycfile = open(Gen_PyCfile_path,'w')

   206

        pycfile.write(PyCFileContent)

   207

        pycfile.close()

   208

   209

        matiec_flags = '"-I%s"'%os.path.abspath(

   210

            self.GetCTRoot().GetIECLibPath())

   211

   212

        return ([(Gen_PyCfile_path, matiec_flags)],

   213

                "",

   214

                True,

   215

                ("runtime_%s.py"%location_str, file(runtimefile_path,"rb")))

   216