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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
# AWL parser
# Copyright 2012 Michael Buesch <m@bues.ch>
#
# Licensed under the terms of the GNU General Public License version 2.
#
import sys
import re
from util import *
class RawAwlInsn(object):
def __init__(self):
self.lineNr = 0
self.label = None
self.name = None
self.ops = []
__labelRe = re.compile(r'^[_a-zA-Z][_0-9a-zA-Z]{0,3}$')
@classmethod
def isValidLabel(cls, labelString):
return bool(cls.__labelRe.match(labelString))
def __repr__(self):
ret = []
if self.hasLabel():
ret.append(self.getLabel() + ':\t')
else:
ret.append('\t')
ret.append(self.getName())
ret.extend(self.getOperators())
return "\t".join(ret)
def setLineNr(self, newLineNr):
self.lineNr = newLineNr
def getLineNr(self):
return self.lineNr
def setLabel(self, newLabel):
self.label = newLabel
def getLabel(self):
return self.label
def hasLabel(self):
return bool(self.getLabel())
def setName(self, newName):
self.name = newName
def getName(self):
return self.name
def setOperators(self, newOperators):
self.ops = newOperators
def getOperators(self):
return self.ops
def hasOperators(self):
return bool(self.getOperators())
class RawAwlBlock(object):
def __init__(self, index):
self.index = index
class RawAwlDB(RawAwlBlock):
def __init__(self, index):
RawAwlBlock.__init__(self, index)
class RawAwlOB(RawAwlBlock):
def __init__(self, index):
RawAwlBlock.__init__(self, index)
self.insns = []
class RawAwlFB(RawAwlBlock):
def __init__(self, index):
RawAwlBlock.__init__(self, index)
self.insns = []
class RawAwlFC(RawAwlBlock):
def __init__(self, index):
RawAwlBlock.__init__(self, index)
self.insns = []
class AwlParseTree(object):
def __init__(self):
self.dbs = {}
self.fbs = {}
self.fcs = {}
self.obs = {}
self.curBlockIndex = None
class AwlParser(object):
STATE_GLOBAL = 0
STATE_IN_DB_HDR = 1
STATE_IN_DB = 2
STATE_IN_FB_HDR = 3
STATE_IN_FB = 4
STATE_IN_FC_HDR = 5
STATE_IN_FC = 6
STATE_IN_OB_HDR = 7
STATE_IN_OB = 8
def __init__(self):
self.reset()
def reset(self):
self.state = self.STATE_GLOBAL
self.flatLayout = True
self.tree = AwlParseTree()
def __setState(self, newState):
self.state = newState
self.flatLayout = False
def __inAnyHeader(self):
if self.flatLayout:
return False
return self.state in (self.STATE_IN_DB_HDR,
self.STATE_IN_FB_HDR,
self.STATE_IN_FC_HDR,
self.STATE_IN_OB_HDR)
def __parseLine(self, line):
line = line.strip()
if not line:
return None
tokens = []
curToken = ""
inQuote = False
for i, c in enumerate(line):
if c == '"':
inQuote = not inQuote
if c == ';' and not inQuote:
break
if not inQuote and\
c == '/' and i + 1 < len(line) and\
line[i + 1] == '/':
break
if tokens and not inQuote:
if (self.__inAnyHeader() and\
c in ('=', ':')) or\
(c == ','):
curToken = curToken.strip()
if curToken:
tokens.append(curToken)
tokens.append(c)
curToken = ""
continue
if not c.isspace() or inQuote:
curToken += c
if (c.isspace() and not inQuote) or\
i == len(line) - 1:
curToken = curToken.strip()
if curToken:
tokens.append(curToken)
curToken = ""
if curToken:
tokens.append(curToken)
if inQuote:
raise AwlParserError("Unterminated quote: " + line)
if not tokens:
return None
if self.state == self.STATE_GLOBAL:
return self.__parseTokens_global(line, tokens)
if self.state == self.STATE_IN_DB_HDR:
return self.__parseTokens_db_hdr(line, tokens)
if self.state == self.STATE_IN_DB:
return self.__parseTokens_db(line, tokens)
if self.state == self.STATE_IN_FB_HDR:
return self.__parseTokens_fb_hdr(line, tokens)
if self.state == self.STATE_IN_FB:
return self.__parseTokens_fb(line, tokens)
if self.state == self.STATE_IN_FC_HDR:
return self.__parseTokens_fc_hdr(line, tokens)
if self.state == self.STATE_IN_FC:
return self.__parseTokens_fc(line, tokens)
if self.state == self.STATE_IN_OB_HDR:
return self.__parseTokens_ob_hdr(line, tokens)
if self.state == self.STATE_IN_OB:
return self.__parseTokens_ob(line, tokens)
assert(0)
def __parseTokens_global(self, line, tokens):
try:
if tokens[0].upper() == "DATA_BLOCK":
self.__setState(self.STATE_IN_DB_HDR)
if tokens[1].upper() != "DB":
raise AwlParserError("Invalid DB name")
dbNumber = int(tokens[2], 10)
self.tree.dbs[dbNumber] = RawAwlDB(dbNumber)
self.tree.curBlockIndex = dbNumber
return
if tokens[0].upper() == "FUNCTION_BLOCK":
self.__setState(self.STATE_IN_FB_HDR)
if tokens[1].upper() != "FB":
raise AwlParserError("Invalid FB name")
fbNumber = int(tokens[2], 10)
self.tree.fbs[fbNumber] = RawAwlFB(fbNumber)
self.tree.curBlockIndex = fbNumber
return
if tokens[0].upper() == "FUNCTION":
self.__setState(self.STATE_IN_FC_HDR)
if tokens[1].upper() != "FC":
raise AwlParserError("Invalid FC name")
fcNumber = int(tokens[2], 10)
self.tree.fcs[fcNumber] = RawAwlFC(fcNumber)
self.tree.curBlockIndex = fcNumber
return
if tokens[0].upper() == "ORGANIZATION_BLOCK":
self.__setState(self.STATE_IN_OB_HDR)
if tokens[1].upper() != "OB":
raise AwlParserError("Invalid OB name")
obNumber = int(tokens[2], 10)
self.tree.obs[obNumber] = RawAwlOB(obNumber)
self.tree.curBlockIndex = obNumber
return
except IndexError as e:
raise AwlParserError("Missing token")
except ValueError as e:
raise AwlParserError("Invalid value")
if self.flatLayout:
if not self.tree.obs:
self.tree.obs[1] = RawAwlOB(1)
insn = self.__parseInstruction(line, tokens)
self.tree.obs[1].insns.append(insn)
return
raise AwlParserError("Trailing foo")
def __parseInstruction(self, line, tokens):
insn = RawAwlInsn()
insn.setLineNr(self.lineNr)
if tokens[0].endswith(":"):
# First token is a label
label = tokens[0][0:-1]
if not label or not RawAwlInsn.isValidLabel(label):
raise AwlParserError("Invalid label: " + line)
insn.setLabel(label)
tokens = tokens[1:]
if not tokens:
raise AwlParserError("No instruction name: " + line)
insn.setName(tokens[0])
tokens = tokens[1:]
if tokens:
# Operators to insn are specified
insn.setOperators(tokens)
return insn
def __parseTokens_db_hdr(self, line, tokens):
if tokens[0].upper() == "BEGIN":
self.__setState(self.STATE_IN_DB)
return
pass#TODO
def __parseTokens_db(self, line, tokens):
if tokens[0].upper() == "END_DATA_BLOCK":
self.__setState(self.STATE_GLOBAL)
return
pass#TODO
def __parseTokens_fb_hdr(self, line, tokens):
if tokens[0].upper() == "BEGIN":
self.__setState(self.STATE_IN_FB)
return
pass#TODO
def __parseTokens_fb(self, line, tokens):
if tokens[0].upper() == "END_FUNCTION_BLOCK":
self.__setState(self.STATE_GLOBAL)
return
if tokens[0].upper() == "NETWORK" or\
tokens[0].upper() == "TITLE":
return # ignore
insn = self.__parseInstruction(line, tokens)
self.tree.fbs[self.tree.curBlockIndex].insns.append(insn)
def __parseTokens_fc_hdr(self, line, tokens):
if tokens[0].upper() == "BEGIN":
self.__setState(self.STATE_IN_FC)
return
pass#TODO
def __parseTokens_fc(self, line, tokens):
if tokens[0].upper() == "END_FUNCTION":
self.__setState(self.STATE_GLOBAL)
return
if tokens[0].upper() == "NETWORK" or\
tokens[0].upper() == "TITLE":
return # ignore
insn = self.__parseInstruction(line, tokens)
self.tree.fcs[self.tree.curBlockIndex].insns.append(insn)
def __parseTokens_ob_hdr(self, line, tokens):
if tokens[0].upper() == "BEGIN":
self.__setState(self.STATE_IN_OB)
return
pass#TODO
def __parseTokens_ob(self, line, tokens):
if tokens[0].upper() == "END_ORGANIZATION_BLOCK":
self.__setState(self.STATE_GLOBAL)
return
if tokens[0].upper() == "NETWORK" or\
tokens[0].upper() == "TITLE":
return # ignore
insn = self.__parseInstruction(line, tokens)
self.tree.obs[self.tree.curBlockIndex].insns.append(insn)
def parseFile(self, filename):
self.parseData(awlFileRead(filename))
def parseData(self, data):
self.reset()
self.lineNr = 0
for line in data.splitlines():
self.lineNr += 1
line = line.strip()
if not line:
continue
self.__parseLine(line)
def getParseTree(self):
return self.tree
if __name__ == "__main__":
p = AwlParser()
p.parseFile(sys.argv[1])
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