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#!/usr/bin/env python

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# -*- coding: utf-8 -*-

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#This file is part of PLCOpenEditor, a library implementing an IEC 61131-3 editor

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#based on the plcopen standard. 

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#

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#Copyright (C) 2007: Edouard TISSERANT and Laurent BESSARD

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#

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#See COPYING file for copyrights details.

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#

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#This library is free software; you can redistribute it and/or

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#modify it under the terms of the GNU General Public

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#License as published by the Free Software Foundation; either

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#version 2.1 of the License, or (at your option) any later version.

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#

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#This library 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 GNU

    19

#General Public License for more details.

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#

    21

#You should have received a copy of the GNU General Public

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#License along with this library; if not, write to the Free Software

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#Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    24

    25

import string, os, sys, re

    26

from plcopen import LoadProject

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    28

LANGUAGES = ["IL","ST","FBD","LD","SFC"]

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LOCATIONDATATYPES = {"X" : ["BOOL"],

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                     "B" : ["SINT", "USINT", "BYTE", "STRING"],

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                     "W" : ["INT", "UINT", "WORD", "WSTRING"],

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                     "D" : ["DINT", "UDINT", "REAL", "DWORD"],

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                     "L" : ["LINT", "ULINT", "LREAL", "LWORD"]} 

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    36

_ = lambda x:x

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    38

#-------------------------------------------------------------------------------

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#                        Function Block Types definitions

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#-------------------------------------------------------------------------------

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ScriptDirectory = os.path.split(os.path.realpath(__file__))[0]

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StdBlockLibrary = LoadProject(os.path.join(ScriptDirectory, "Standard_Function_Blocks.xml"))

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AddnlBlockLibrary = LoadProject(os.path.join(ScriptDirectory, "Additional_Function_Blocks.xml"))

    46

    47

StdBlockComments = {

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    "SR": _("SR bistable\nThe SR bistable is a latch where the Set dominates."),

    49

    "RS": _("RS bistable\nThe RS bistable is a latch where the Reset dominates."),

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    "SEMA": _("Semaphore\nThe semaphore provides a mechanism to allow software elements mutually exclusive access to certain ressources."),

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    "R_TRIG": _("Rising edge detector\nThe output produces a single pulse when a rising edge is detected."),

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    "F_TRIG": _("Falling edge detector\nThe output produces a single pulse when a falling edge is detected."),

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    "CTU": _("Up-counter\nThe up-counter can be used to signal when a count has reached a maximum value."),

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    "CTD": _("Down-counter\nThe down-counter can be used to signal when a count has reached zero, on counting down from a preset value."),

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    "CTUD": _("Up-down counter\nThe up-down counter has two inputs CU and CD. It can be used to both count up on one input and down on the other."),

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    "TP": _("Pulse timer\nThe pulse timer can be used to generate output pulses of a given time duration."),

    57

    "TON": _("On-delay timer\nThe on-delay timer can be used to delay setting an output true, for fixed period after an input becomes true."),

    58

    "TOF": _("Off-delay timer\nThe off-delay timer can be used to delay setting an output false, for fixed period after input goes false."),

    59

    "RTC": _("Real time clock\nThe real time clock has many uses including time stamping, setting dates and times of day in batch reports, in alarm messages and so on."),

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    "INTEGRAL": _("Integral\nThe integral function block integrates the value of input XIN over time."),

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    "DERIVATIVE": _("Derivative\nThe derivative function block produces an output XOUT proportional to the rate of change of the input XIN."),

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    "PID": _("PID\nThe PID (proportional, Integral, Derivative) function block provides the classical three term controller for closed loop control."),

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    "RAMP": _("Ramp\nThe RAMP function block is modelled on example given in the standard."),

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    "HYSTERESIS": _("Hysteresis\nThe hysteresis function block provides a hysteresis boolean output driven by the difference of two floating point (REAL) inputs XIN1 and XIN2."),

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}

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    67

for block_type in ["CTU", "CTD", "CTUD"]:

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    for return_type in ["DINT", "LINT", "UDINT", "ULINT"]:

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        StdBlockComments["%s_%s" % (block_type, return_type)] = StdBlockComments[block_type]

    70

    71

def GetBlockInfos(pou):

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    infos = pou.getblockInfos()

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    infos["comment"] = StdBlockComments[infos["name"]]

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    infos["inputs"] = [

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        (var_name, var_type, "rising")

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        if var_name in ["CU", "CD"]

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        else (var_name, var_type, var_modifier)

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        for var_name, var_type, var_modifier in infos["inputs"]]

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    return infos

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"""

    82

Ordored list of common Function Blocks defined in the IEC 61131-3

    83

Each block have this attributes:

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    - "name" : The block name

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    - "type" : The block type. It can be "function", "functionBlock" or "program"

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    - "extensible" : Boolean that define if the block is extensible

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    - "inputs" : List of the block inputs

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    - "outputs" : List of the block outputs

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    - "comment" : Comment that will be displayed in the block popup

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    - "generate" : Method that generator will call for generating ST block code

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Inputs and outputs are a tuple of characteristics that are in order:

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    - The name

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    - The data type

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    - The default modifier which can be "none", "negated", "rising" or "falling"

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"""

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StdBlckLst = [{"name" : _("Standard function blocks"), "list":

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               [GetBlockInfos(pou) for pou in StdBlockLibrary.getpous()]},

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              {"name" : _("Additional function blocks"), "list":

   100

               [GetBlockInfos(pou) for pou in AddnlBlockLibrary.getpous()]},

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             ]

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   103

   104

#-------------------------------------------------------------------------------

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#                           Data Types definitions

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#-------------------------------------------------------------------------------

   107

   108

"""

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Ordored list of common data types defined in the IEC 61131-3

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Each type is associated to his direct parent type. It defines then a hierarchy

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between type that permits to make a comparison of two types

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"""

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TypeHierarchy_list = [

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    ("ANY", None),

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    ("ANY_DERIVED", "ANY"),

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    ("ANY_ELEMENTARY", "ANY"),

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    ("ANY_MAGNITUDE", "ANY_ELEMENTARY"),

   118

    ("ANY_BIT", "ANY_ELEMENTARY"),

   119

    ("ANY_NBIT", "ANY_BIT"),

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    ("ANY_STRING", "ANY_ELEMENTARY"),

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    ("ANY_DATE", "ANY_ELEMENTARY"),

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    ("ANY_NUM", "ANY_MAGNITUDE"),

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    ("ANY_REAL", "ANY_NUM"),

   124

    ("ANY_INT", "ANY_NUM"),

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    ("ANY_SINT", "ANY_INT"),

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    ("ANY_UINT", "ANY_INT"),

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    ("BOOL", "ANY_BIT"),

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    ("SINT", "ANY_SINT"),

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    ("INT", "ANY_SINT"),

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    ("DINT", "ANY_SINT"),

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    ("LINT", "ANY_SINT"),

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    ("USINT", "ANY_UINT"),

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    ("UINT", "ANY_UINT"),

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    ("UDINT", "ANY_UINT"),

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    ("ULINT", "ANY_UINT"),

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    ("REAL", "ANY_REAL"),

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    ("LREAL", "ANY_REAL"),

   138

    ("TIME", "ANY_MAGNITUDE"),

   139

    ("DATE", "ANY_DATE"),

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    ("TOD", "ANY_DATE"),

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    ("DT", "ANY_DATE"),

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    ("STRING", "ANY_STRING"),

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    ("BYTE", "ANY_NBIT"),

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    ("WORD", "ANY_NBIT"),

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    ("DWORD", "ANY_NBIT"),

   146

    ("LWORD", "ANY_NBIT")

   147

    #("WSTRING", "ANY_STRING") # TODO

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]

   149

   150

TypeHierarchy = dict(TypeHierarchy_list)

   151

   152

"""

   153

returns true if the given data type is the same that "reference" meta-type or one of its types.

   154

"""

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def IsOfType(type, reference):

   156

    if reference is None:

   157

        return True

   158

    elif type == reference:

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        return True

   160

    else:

   161

        parent_type = TypeHierarchy[type]

   162

        if parent_type is not None:

   163

            return IsOfType(parent_type, reference)

   164

    return False

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   166

"""

   167

returns list of all types that correspont to the ANY* meta type

   168

"""

   169

def GetSubTypes(type):

   170

    return [typename for typename, parenttype in TypeHierarchy.items() if not typename.startswith("ANY") and IsOfType(typename, type)]

   171

   172

   173

DataTypeRange_list = [

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    ("SINT", (-2**7, 2**7 - 1)),

   175

    ("INT", (-2**15, 2**15 - 1)),

   176

    ("DINT", (-2**31, 2**31 - 1)),

   177

    ("LINT", (-2**31, 2**31 - 1)),

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    ("USINT", (0, 2**8 - 1)),

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    ("UINT", (0, 2**16 - 1)),

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    ("UDINT", (0, 2**31 - 1)),

   181

    ("ULINT", (0, 2**31 - 1))

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]

   183

   184

DataTypeRange = dict(DataTypeRange_list)

   185

   186

   187

   188

#-------------------------------------------------------------------------------

   189

#                             Test identifier

   190

#-------------------------------------------------------------------------------

   191

   192

IDENTIFIER_MODEL = re.compile(

   193

    "(?:%(letter)s|_(?:%(letter)s|%(digit)s))(?:_?(?:%(letter)s|%(digit)s))*$" %

   194

    {"letter": "[a-zA-Z]", "digit": "[0-9]"})

   195

   196

# Test if identifier is valid

   197

def TestIdentifier(identifier):

   198

     return IDENTIFIER_MODEL.match(identifier) is not None

   199

   200

#-------------------------------------------------------------------------------

   201

#                        Standard functions list generation

   202

#-------------------------------------------------------------------------------

   203

   204

   205

"""

   206

take a .csv file and translate it it a "csv_table"

   207

"""            

   208

def csv_file_to_table(file):

   209

    return [ map(string.strip,line.split(';')) for line in file.xreadlines()]

   210

   211

"""

   212

seek into the csv table to a section ( section_name match 1st field )

   213

return the matching row without first field

   214

"""

   215

def find_section(section_name, table):

   216

    fields = [None]

   217

    while(fields[0] != section_name):

   218

        fields = table.pop(0)

   219

    return fields[1:]

   220

   221

"""

   222

extract the standard functions standard parameter names and types...

   223

return a { ParameterName: Type, ...}

   224

"""

   225

def get_standard_funtions_input_variables(table):

   226

    variables = find_section("Standard_functions_variables_types", table)

   227

    standard_funtions_input_variables = {}

   228

    fields = [True,True]

   229

    while(fields[1]):

   230

        fields = table.pop(0)

   231

        variable_from_csv = dict([(champ, val) for champ, val in zip(variables, fields[1:]) if champ!=''])

   232

        standard_funtions_input_variables[variable_from_csv['name']] = variable_from_csv['type']

   233

    return standard_funtions_input_variables

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   235

"""

   236

translate .csv file input declaration into PLCOpenEditor interessting values

   237

in : "(ANY_NUM, ANY_NUM)" and { ParameterName: Type, ...}

   238

return [("IN1","ANY_NUM","none"),("IN2","ANY_NUM","none")] 

   239

"""

   240

def csv_input_translate(str_decl, variables, base):

   241

    decl = str_decl.replace('(','').replace(')','').replace(' ','').split(',')

   242

    params = []

   243

   244

    len_of_not_predifined_variable = len([True for param_type in decl if param_type not in variables])

   245

   246

    for param_type in decl:

   247

        if param_type in variables.keys():

   248

            param_name = param_type

   249

            param_type = variables[param_type]

   250

        elif len_of_not_predifined_variable > 1:

   251

            param_name = "IN%d"%base

   252

            base += 1

   253

        else:

   254

            param_name = "IN"

   255

        params.append((param_name, param_type, "none"))

   256

    return params

   257

   258

   259

ANY_TO_ANY_LIST=[

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        # simple type conv are let as C cast

   261

        (("ANY_INT","ANY_BIT"),("ANY_NUM","ANY_BIT"), ("return_type", "__move_", "IN_type")),

   262

        (("ANY_REAL",),("ANY_REAL",), ("return_type", "__move_", "IN_type")),

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        # REAL_TO_INT

   264

        (("ANY_REAL",),("ANY_SINT",), ("return_type", "__real_to_sint", None)),

   265

        (("ANY_REAL",),("ANY_UINT",), ("return_type", "__real_to_uint", None)),

   266

        (("ANY_REAL",),("ANY_BIT",), ("return_type", "__real_to_bit", None)),

   267

        # TO_TIME

   268

        (("ANY_INT","ANY_BIT"),("ANY_DATE","TIME"), ("return_type", "__int_to_time", None)),

   269

        (("ANY_REAL",),("ANY_DATE","TIME"), ("return_type", "__real_to_time", None)),

   270

        (("ANY_STRING",), ("ANY_DATE","TIME"), ("return_type", "__string_to_time", None)),

   271

        # FROM_TIME

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        (("ANY_DATE","TIME"), ("ANY_REAL",), ("return_type", "__time_to_real", None)),

   273

        (("ANY_DATE","TIME"), ("ANY_INT","ANY_NBIT"), ("return_type", "__time_to_int", None)),

   274

        (("TIME",), ("ANY_STRING",), ("return_type", "__time_to_string", None)),

   275

        (("DATE",), ("ANY_STRING",), ("return_type", "__date_to_string", None)),

   276

        (("TOD",), ("ANY_STRING",), ("return_type", "__tod_to_string", None)),

   277

        (("DT",), ("ANY_STRING",), ("return_type", "__dt_to_string", None)),

   278

        # TO_STRING

   279

        (("BOOL",), ("ANY_STRING",), ("return_type", "__bool_to_string", None)),

   280

        (("ANY_BIT",), ("ANY_STRING",), ("return_type", "__bit_to_string", None)),

   281

        (("ANY_REAL",), ("ANY_STRING",), ("return_type", "__real_to_string", None)),

   282

        (("ANY_SINT",), ("ANY_STRING",), ("return_type", "__sint_to_string", None)),

   283

        (("ANY_UINT",), ("ANY_STRING",), ("return_type", "__uint_to_string", None)),

   284

        # FROM_STRING

   285

        (("ANY_STRING",), ("BOOL",), ("return_type", "__string_to_bool", None)),

   286

        (("ANY_STRING",), ("ANY_BIT",), ("return_type", "__string_to_bit", None)),

   287

        (("ANY_STRING",), ("ANY_SINT",), ("return_type", "__string_to_sint", None)),

   288

        (("ANY_STRING",), ("ANY_UINT",), ("return_type", "__string_to_uint", None)),

   289

        (("ANY_STRING",), ("ANY_REAL",), ("return_type", "__string_to_real", None))]

   290

   291

   292

BCD_TO_ANY_LIST=[

   293

        (("BYTE",),("USINT",), ("return_type", "__bcd_to_uint", None)),

   294

        (("WORD",),("UINT",), ("return_type", "__bcd_to_uint", None)),

   295

        (("DWORD",),("UDINT",), ("return_type", "__bcd_to_uint", None)),

   296

        (("LWORD",),("ULINT",), ("return_type", "__bcd_to_uint", None))]

   297

   298

   299

ANY_TO_BCD_LIST=[

   300

        (("USINT",),("BYTE",), ("return_type", "__uint_to_bcd", None)),

   301

        (("UINT",),("WORD",), ("return_type", "__uint_to_bcd", None)),

   302

        (("UDINT",),("DWORD",), ("return_type", "__uint_to_bcd", None)),

   303

        (("ULINT",),("LWORD",), ("return_type", "__uint_to_bcd", None))]

   304

   305

   306

def ANY_TO_ANY_FORMAT_GEN(any_to_any_list, fdecl):

   307

   308

    for (InTypes, OutTypes, Format) in any_to_any_list:

   309

        outs = reduce(lambda a,b: a or b, map(lambda testtype : IsOfType(fdecl["outputs"][0][1],testtype), OutTypes))

   310

        inps = reduce(lambda a,b: a or b, map(lambda testtype : IsOfType(fdecl["inputs"][0][1],testtype), InTypes))

   311

        if inps and outs and fdecl["outputs"][0][1] != fdecl["inputs"][0][1]:

   312

             return Format

   313

   314

    return None

   315

   316

   317

"""

   318

Returns this kind of declaration for all standard functions

   319

   320

            [{"name" : "Numerical", 'list': [   {   

   321

                'baseinputnumber': 1,

   322

                'comment': 'Addition',

   323

                'extensible': True,

   324

                'inputs': [   ('IN1', 'ANY_NUM', 'none'),

   325

                              ('IN2', 'ANY_NUM', 'none')],

   326

                'name': 'ADD',

   327

                'outputs': [('OUT', 'ANY_NUM', 'none')],

   328

                'type': 'function'}, ...... ] },.....]

   329

"""

   330

def get_standard_funtions(table):

   331

   332

    variables = get_standard_funtions_input_variables(table)

   333

   334

    fonctions = find_section("Standard_functions_type",table)

   335

   336

    Standard_Functions_Decl = []

   337

    Current_section = None

   338

   339

    translate = {

   340

            "extensible" : lambda x: {"yes":True, "no":False}[x],

   341

            "inputs" : lambda x:csv_input_translate(x,variables,baseinputnumber),

   342

            "outputs":lambda x:[("OUT",x,"none")]}

   343

   344

    for fields in table:

   345

        if fields[1]:

   346

            # If function section name given

   347

            if fields[0]:

   348

                words = fields[0].split('"')

   349

                if len(words) > 1:

   350

                    section_name = words[1]

   351

                else:

   352

                    section_name = fields[0]

   353

                Current_section = {"name" : section_name, "list" : []}

   354

                Standard_Functions_Decl.append(Current_section)

   355

                Function_decl_list = []

   356

            if Current_section:

   357

                Function_decl = dict([(champ, val) for champ, val in zip(fonctions, fields[1:]) if champ])

   358

                baseinputnumber = int(Function_decl.get("baseinputnumber",1))

   359

                Function_decl["baseinputnumber"] = baseinputnumber

   360

                for param, value in Function_decl.iteritems():

   361

                    if param in translate:

   362

                        Function_decl[param] = translate[param](value)

   363

                Function_decl["type"] = "function"

   364

   365

                if Function_decl["name"].startswith('*') or Function_decl["name"].endswith('*') :

   366

                    input_ovrloading_types = GetSubTypes(Function_decl["inputs"][0][1])

   367

                    output_types = GetSubTypes(Function_decl["outputs"][0][1])

   368

                else:

   369

                    input_ovrloading_types = [None]

   370

                    output_types = [None]

   371

   372

                funcdeclname_orig = Function_decl["name"]

   373

                funcdeclname = Function_decl["name"].strip('*_')

   374

                fdc = Function_decl["inputs"][:]

   375

                for intype in input_ovrloading_types:

   376

                    if intype != None:

   377

                        Function_decl["inputs"] = []

   378

                        for decl_tpl in fdc:

   379

                            if IsOfType(intype, decl_tpl[1]):

   380

                                Function_decl["inputs"] += [(decl_tpl[0], intype, decl_tpl[2])]

   381

                            else:

   382

                                Function_decl["inputs"] += [(decl_tpl)]

   383

   384

                            if funcdeclname_orig.startswith('*'):

   385

                                funcdeclin = intype + '_' + funcdeclname 

   386

                            else:

   387

                                funcdeclin = funcdeclname

   388

                    else:

   389

                        funcdeclin = funcdeclname

   390

   391

                    for outype in output_types:

   392

                        if outype != None:

   393

                            decl_tpl = Function_decl["outputs"][0]

   394

                            Function_decl["outputs"] = [ (decl_tpl[0] , outype,  decl_tpl[2])]

   395

                            if funcdeclname_orig.endswith('*'):

   396

                                funcdeclout =  funcdeclin + '_' + outype

   397

                            else:

   398

                                funcdeclout =  funcdeclin

   399

                        else:

   400

                            funcdeclout =  funcdeclin

   401

                        Function_decl["name"] = funcdeclout

   402

   403

   404

                        fdecl = Function_decl

   405

                        res = eval(Function_decl["python_eval_c_code_format"])

   406

   407

                        if res != None :

   408

                            # create the copy of decl dict to be appended to section

   409

                            Function_decl_copy = Function_decl.copy()

   410

                            Current_section["list"].append(Function_decl_copy)

   411

            else:

   412

                raise "First function must be in a category"

   413

   414

    return Standard_Functions_Decl

   415

   416

std_decl = get_standard_funtions(csv_file_to_table(open(os.path.join(ScriptDirectory,"iec_std.csv"))))#, True)

   417

   418

StdBlckLst.extend(std_decl)

   419

   420

# Dictionary to speedup block type fetching by name

   421

StdBlckDct = {}

   422

   423

for section in StdBlckLst:

   424

    for desc in section["list"]:

   425

        words = desc["comment"].split('"')

   426

        if len(words) > 1:

   427

            desc["comment"] = words[1]

   428

        desc["usage"] = ("\n (%s) => (%s)" % 

   429

            (", ".join(["%s:%s" % (input[1], input[0]) 

   430

                        for input in desc["inputs"]]),

   431

             ", ".join(["%s:%s" % (output[1], output[0]) 

   432

                        for output in desc["outputs"]])))

   433

        BlkLst = StdBlckDct.setdefault(desc["name"],[])

   434

        BlkLst.append((section["name"], desc))

   435

   436

#-------------------------------------------------------------------------------

   437

#                            Languages Keywords

   438

#-------------------------------------------------------------------------------

   439

   440

   441

# Keywords for Pou Declaration

   442

POU_BLOCK_START_KEYWORDS = ["FUNCTION", "FUNCTION_BLOCK", "PROGRAM"]

   443

POU_BLOCK_END_KEYWORDS = ["END_FUNCTION", "END_FUNCTION_BLOCK", "END_PROGRAM"]

   444

POU_KEYWORDS = ["EN", "ENO", "F_EDGE", "R_EDGE"] + POU_BLOCK_START_KEYWORDS + POU_BLOCK_END_KEYWORDS

   445

for category in StdBlckLst:

   446

    for block in category["list"]:

   447

        if block["name"] not in POU_KEYWORDS:

   448

            POU_KEYWORDS.append(block["name"])

   449

   450

   451

# Keywords for Type Declaration

   452

TYPE_BLOCK_START_KEYWORDS = ["TYPE", "STRUCT"]

   453

TYPE_BLOCK_END_KEYWORDS = ["END_TYPE", "END_STRUCT"]

   454

TYPE_KEYWORDS = ["ARRAY", "OF", "T", "D", "TIME_OF_DAY", "DATE_AND_TIME"] + TYPE_BLOCK_START_KEYWORDS + TYPE_BLOCK_END_KEYWORDS

   455

TYPE_KEYWORDS.extend([keyword for keyword in TypeHierarchy.keys() if keyword not in TYPE_KEYWORDS])

   456

   457

   458

# Keywords for Variable Declaration

   459

VAR_BLOCK_START_KEYWORDS = ["VAR", "VAR_INPUT", "VAR_OUTPUT", "VAR_IN_OUT", "VAR_TEMP", "VAR_EXTERNAL"]

   460

VAR_BLOCK_END_KEYWORDS = ["END_VAR"]

   461

VAR_KEYWORDS = ["AT", "CONSTANT", "RETAIN", "NON_RETAIN"] + VAR_BLOCK_START_KEYWORDS + VAR_BLOCK_END_KEYWORDS

   462

   463

   464

# Keywords for Configuration Declaration

   465

CONFIG_BLOCK_START_KEYWORDS = ["CONFIGURATION", "RESOURCE", "VAR_ACCESS", "VAR_CONFIG", "VAR_GLOBAL"]

   466

CONFIG_BLOCK_END_KEYWORDS = ["END_CONFIGURATION", "END_RESOURCE", "END_VAR"]

   467

CONFIG_KEYWORDS = ["ON", "PROGRAM", "WITH", "READ_ONLY", "READ_WRITE", "TASK"] + CONFIG_BLOCK_START_KEYWORDS + CONFIG_BLOCK_END_KEYWORDS

   468

   469

# Keywords for Structured Function Chart

   470

SFC_BLOCK_START_KEYWORDS = ["ACTION", "INITIAL_STEP", "STEP", "TRANSITION"]

   471

SFC_BLOCK_END_KEYWORDS = ["END_ACTION", "END_STEP", "END_TRANSITION"]

   472

SFC_KEYWORDS = ["FROM", "TO"] + SFC_BLOCK_START_KEYWORDS + SFC_BLOCK_END_KEYWORDS

   473

   474

   475

# Keywords for Instruction List

   476

IL_KEYWORDS = ["TRUE", "FALSE", "LD", "LDN", "ST", "STN", "S", "R", "AND", "ANDN", "OR", "ORN",

   477

 "XOR", "XORN", "NOT", "ADD", "SUB", "MUL", "DIV", "MOD", "GT", "GE", "EQ", "NE",

   478

 "LE", "LT", "JMP", "JMPC", "JMPCN", "CAL", "CALC", "CALCN", "RET", "RETC", "RETCN"]

   479

   480

   481

# Keywords for Structured Text

   482

ST_BLOCK_START_KEYWORDS = ["IF", "ELSIF", "ELSE", "CASE", "FOR", "WHILE", "REPEAT"]

   483

ST_BLOCK_END_KEYWORDS = ["END_IF", "END_CASE", "END_FOR", "END_WHILE", "END_REPEAT"]

   484

ST_KEYWORDS = ["TRUE", "FALSE", "THEN", "OF", "TO", "BY", "DO", "DO", "UNTIL", "EXIT", 

   485

 "RETURN", "NOT", "MOD", "AND", "XOR", "OR"] + ST_BLOCK_START_KEYWORDS + ST_BLOCK_END_KEYWORDS

   486

   487

# All the keywords of IEC

   488

IEC_BLOCK_START_KEYWORDS = []

   489

IEC_BLOCK_END_KEYWORDS = []

   490

IEC_KEYWORDS = ["E", "TRUE", "FALSE"]

   491

for all_keywords, keywords_list in [(IEC_BLOCK_START_KEYWORDS, [POU_BLOCK_START_KEYWORDS, TYPE_BLOCK_START_KEYWORDS,

   492

                                                                VAR_BLOCK_START_KEYWORDS, CONFIG_BLOCK_START_KEYWORDS,

   493

                                                                SFC_BLOCK_START_KEYWORDS, ST_BLOCK_START_KEYWORDS]),

   494

                                    (IEC_BLOCK_END_KEYWORDS, [POU_BLOCK_END_KEYWORDS, TYPE_BLOCK_END_KEYWORDS,

   495

                                                              VAR_BLOCK_END_KEYWORDS, CONFIG_BLOCK_END_KEYWORDS,

   496

                                                              SFC_BLOCK_END_KEYWORDS, ST_BLOCK_END_KEYWORDS]),

   497

                                    (IEC_KEYWORDS, [POU_KEYWORDS, TYPE_KEYWORDS, VAR_KEYWORDS, CONFIG_KEYWORDS,

   498

                                                    SFC_KEYWORDS, IL_KEYWORDS, ST_KEYWORDS])]:

   499

    for keywords in keywords_list:

   500

        all_keywords.extend([keyword for keyword in keywords if keyword not in all_keywords])

   501