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# -*- coding: utf-8 -*-
#
# AWL simulator - symbol table parser
#
# Copyright 2014 Michael Buesch <m@bues.ch>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
from __future__ import division, absolute_import, print_function, unicode_literals
from awlsim.core.compat import *
from awlsim.core.datatypes import *
from awlsim.core.cpuspecs import *
from awlsim.core.optrans import *
from awlsim.core.util import *
class Symbol(object):
"""One symbol."""
def __init__(self, name, operator, type, comment=""):
self.name = name # The symbol name string
self.operator = operator # The symbol address (AwlOperator)
self.type = type # The symbol type (AwlDataType)
self.comment = comment # The comment string
def nameIsEqual(self, otherName):
return self.name.upper() == otherName.upper()
def __repr__(self):
return '"%s", "%s", "%s", "%s"' %\
(str(self.name), str(self.operator),
str(self.type), str(self.comment))
class SymbolTable(object):
"""Parsed symbol table."""
def __init__(self):
self.clear()
def clear(self):
self.symbols = []
def add(self, symbol):
if self.findByName(symbol.name):
raise AwlSimError("Multiple definitions of "
"symbol '%s'" % symbol.name)
self.symbols.append(symbol)
def findByName(self, name):
for symbol in self.symbols:
if symbol.nameIsEqual(name):
return symbol
return None
def merge(self, other):
"""Merge 'other' into 'self'"""
for symbol in other.symbols:
self.add(symbol)
def __repr__(self):
return "\n".join(str(s) for s in self.symbols)
class SymTabParser(object):
"""Abstract symbol table parser."""
implementations = []
@classmethod
def parseFile(cls, filename,
autodetectFormat=True,
mnemonics=S7CPUSpecs.MNEMONICS_AUTO):
data = awlFileRead(filename)
return cls.parseData(data, autodetectFormat, mnemonics)
@classmethod
def parseData(cls, data,
autodetectFormat=True,
mnemonics=S7CPUSpecs.MNEMONICS_AUTO):
if autodetectFormat:
for implCls in cls.implementations:
if implCls._probe(data):
parserClass = implCls
break
else:
raise AwlSimError("Failed to find a suitable "\
"symbol table parser")
else:
parserClass = cls
if mnemonics == S7CPUSpecs.MNEMONICS_AUTO:
instance = parserClass(S7CPUSpecs.MNEMONICS_EN)
try:
symTab = instance._parse(data)
except AwlSimError as e:
instance = parserClass(S7CPUSpecs.MNEMONICS_DE)
symTab = instance._parse(data)
else:
instance = parserClass(mnemonics)
symTab = instance._parse(data)
return symTab
@classmethod
def _probe(cls, data):
raise NotImplementedError
def __init__(self, mnemonics):
self.mnemonics = mnemonics
def _parse(self, data):
pass
def _parseSym(self, symName, symAddr, symType, symComment,
lineNr):
symName = symName.strip()
symAddr = symAddr.strip().upper()
symType = symType.strip().upper()
symComment = symComment.strip()
if not symName:
raise AwlSimError("Symbol table parser: Unnamed symbol "
"in line %d" % lineNr)
if not symAddr:
raise AwlSimError("Symbol table parser: Symbol '%s' lacks "
"an address (line %d)" % (symName, lineNr))
if symAddr.startswith("VAT") and not symType:
symType = symAddr
if not symType:
raise AwlSimError("Symbol table parser: Symbol '%s' lacks "
"a type (line %d)" % (symName, lineNr))
try:
awlType = AwlDataType.makeByName(symType.split())
except AwlSimError as e:
raise AwlSimError("Symbol table parser: Can't parse symbol "
"type '%s' in line %d" % (symType, lineNr))
try:
opTrans = AwlOpTranslator(insn = None,
mnemonics = self.mnemonics)
opDesc = opTrans.translateOp(rawInsn = None,
rawOps = symAddr.split())
except AwlSimError as e:
raise AwlSimError("Symbol table parser: Can't parse symbol "
"address '%s' in line %d" % (symAddr, lineNr))
return Symbol(name = symName,
operator = opDesc.operator,
type = awlType,
comment = symComment)
class SymTabParser_ASC(SymTabParser):
@classmethod
def _probe(cls, data):
lines = data.splitlines()
return lines and\
len(lines[0]) == 130 and\
lines[0].startswith("126,")
def _parse(self, data):
table = SymbolTable()
lines = data.splitlines()
for i, line in enumerate(lines):
lineNr = i + 1
if not line.strip():
continue
if len(line) != 130:
raise AwlSimError("ASC symbol table parser: "\
"Invalid line length (!= 130 chars) in "\
"line %d" % lineNr)
if not line.startswith("126,"):
raise AwlSimError("ASC symbol table parser: "\
"Invalid line start (!= '126,') in "\
"line %d" % lineNr)
symName = line[4:28]
symAddr = line[28:40]
symType = line[40:50]
symComment = line[50:]
table.add(self._parseSym(symName = symName,
symAddr = symAddr,
symType = symType,
symComment = symComment,
lineNr = lineNr))
return table
SymTabParser.implementations.append(SymTabParser_ASC)
if __name__ == "__main__":
import sys
try:
print(SymTabParser.parseFile(sys.argv[1]))
except AwlSimError as e:
print(str(e))
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