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|
# -*- coding: utf-8 -*-
#
# AWL parser
# Copyright 2012-2013 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, block):
self.block = block
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):
# Checks if string is a valid label or
# label reference (without colons).
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, tree, index):
self.tree = tree
self.index = index
def hasLabel(self, string):
return False
class RawAwlCodeBlock(RawAwlBlock):
def __init__(self, tree, index):
RawAwlBlock.__init__(self, tree, index)
self.insns = []
self.vars_in = []
self.vars_out = []
self.vars_inout = []
self.vars_static = []
self.vars_temp = []
self.retTypeTokens = None
def hasLabel(self, string):
if RawAwlInsn.isValidLabel(string):
for insn in self.insns:
if insn.getLabel() == string:
return True
return False
class RawAwlDataField(object):
def __init__(self, name, valueTokens, typeTokens):
self.name = name
self.valueTokens = valueTokens
self.typeTokens = typeTokens
class RawAwlDB(RawAwlBlock):
def __init__(self, tree, index):
RawAwlBlock.__init__(self, tree, index)
self.fields = []
self.fb = None
def isInstanceDB(self):
return bool(self.fb)
def getByName(self, name):
for field in self.fields:
if field.name == name:
return field
return None
class RawAwlOB(RawAwlCodeBlock):
def __init__(self, tree, index):
RawAwlCodeBlock.__init__(self, tree, index)
class RawAwlFB(RawAwlCodeBlock):
def __init__(self, tree, index):
RawAwlCodeBlock.__init__(self, tree, index)
class RawAwlFC(RawAwlCodeBlock):
def __init__(self, tree, index, retTypeTokens):
RawAwlCodeBlock.__init__(self, tree, index)
self.retTypeTokens = retTypeTokens
class AwlParseTree(object):
def __init__(self):
self.dbs = {}
self.fbs = {}
self.fcs = {}
self.obs = {}
self.curBlock = None
class AwlParser(object):
enum.start
STATE_GLOBAL = enum.item
STATE_IN_DB_HDR = enum.item
STATE_IN_DB_HDR_STRUCT = enum.item
STATE_IN_DB = enum.item
STATE_IN_FB_HDR = enum.item
STATE_IN_FB_HDR_VAR = enum.item
STATE_IN_FB_HDR_VARIN = enum.item
STATE_IN_FB_HDR_VAROUT = enum.item
STATE_IN_FB_HDR_VARINOUT = enum.item
STATE_IN_FB_HDR_VARTEMP = enum.item
STATE_IN_FB = enum.item
STATE_IN_FC_HDR = enum.item
STATE_IN_FC_HDR_VARIN = enum.item
STATE_IN_FC_HDR_VAROUT = enum.item
STATE_IN_FC_HDR_VARINOUT = enum.item
STATE_IN_FC_HDR_VARTEMP = enum.item
STATE_IN_FC = enum.item
STATE_IN_OB_HDR = enum.item
STATE_IN_OB_HDR_VARTEMP = enum.item
STATE_IN_OB = enum.item
enum.end
class TokenizerState(object):
def __init__(self):
self.reset()
def reset(self):
self.tokens = []
self.curToken = ""
self.inComment = False
self.inQuote = False
self.inParens = False
def tokenEnd(self):
self.curToken = self.curToken.strip()
if self.curToken:
self.tokens.append(self.curToken)
self.curToken = ""
def __init__(self):
self.reset()
def reset(self):
self.state = self.STATE_GLOBAL
self.tree = AwlParseTree()
def __setState(self, newState):
self.state = newState
def __inAnyHeader(self):
if self.flatLayout:
return False
return self.state in (self.STATE_IN_DB_HDR,
self.STATE_IN_DB_HDR_STRUCT,
self.STATE_IN_FB_HDR,
self.STATE_IN_FC_HDR,
self.STATE_IN_OB_HDR)
def __inAnyHeaderOrGlobal(self):
if self.flatLayout:
return False
return self.__inAnyHeader() or\
self.state == self.STATE_GLOBAL
def __tokenize(self, data):
self.reset()
self.lineNr = 0
t = self.TokenizerState()
for i, c in enumerate(data):
if c == '\n':
self.lineNr += 1
if t.inComment:
# Consume all comment chars up to \n
if c == '\n':
t.inComment = False
continue
if c == '"':
# Quote begin or end
t.inQuote = not t.inQuote
if t.inQuote:
t.curToken += c
continue
if c == ';':
# Semicolon ends statement.
self.__parseTokens(t)
continue
if c == '/' and i + 1 < len(data) and\
data[i + 1] == '/':
# A //comment ends the statement.
self.__parseTokens(t)
t.inComment = True
continue
if t.tokens:
if c == '(':
# Parenthesis begin
t.inParens = True
t.curToken += c
t.tokenEnd()
continue
if t.inParens and c == ')':
# Parenthesis end
t.inParens = False
t.tokenEnd()
t.tokens.append(c)
continue
if (self.__inAnyHeaderOrGlobal() and\
c in ('=', ':', '[', ']', '..')) or\
(c == ','):
# Handle non-space token separators.
t.tokenEnd()
t.tokens.append(c)
continue
if c == '\n' and not t.inParens:
self.__parseTokens(t)
continue
if c.isspace():
t.tokenEnd()
else:
t.curToken += c
if t.inQuote:
raise AwlParserError("Unterminated quote")
if t.inParens:
raise AwlParserError("Unterminated parenthesis pair")
if t.tokens:
self.__parseTokens(t)
def __parseTokens(self, tokenizerState):
tokenizerState.tokenEnd()
tokens = tokenizerState.tokens
if not tokens:
return
if self.state == self.STATE_GLOBAL or\
self.flatLayout:
self.__parseTokens_global(tokens)
elif self.state == self.STATE_IN_DB_HDR:
self.__parseTokens_db_hdr(tokens)
elif self.state == self.STATE_IN_DB_HDR_STRUCT:
self.__parseTokens_db_hdr_struct(tokens)
elif self.state == self.STATE_IN_DB:
self.__parseTokens_db(tokens)
elif self.state == self.STATE_IN_FB_HDR:
self.__parseTokens_fb_hdr(tokens)
elif self.state == self.STATE_IN_FB_HDR_VAR:
self.__parseTokens_fb_hdr_var(tokens)
elif self.state == self.STATE_IN_FB_HDR_VARIN:
self.__parseTokens_fb_hdr_varin(tokens)
elif self.state == self.STATE_IN_FB_HDR_VAROUT:
self.__parseTokens_fb_hdr_varout(tokens)
elif self.state == self.STATE_IN_FB_HDR_VARINOUT:
self.__parseTokens_fb_hdr_varinout(tokens)
elif self.state == self.STATE_IN_FB_HDR_VARTEMP:
self.__parseTokens_fb_hdr_vartemp(tokens)
elif self.state == self.STATE_IN_FB:
self.__parseTokens_fb(tokens)
elif self.state == self.STATE_IN_FC_HDR:
self.__parseTokens_fc_hdr(tokens)
elif self.state == self.STATE_IN_FC_HDR_VARIN:
self.__parseTokens_fc_hdr_varin(tokens)
elif self.state == self.STATE_IN_FC_HDR_VAROUT:
self.__parseTokens_fc_hdr_varout(tokens)
elif self.state == self.STATE_IN_FC_HDR_VARINOUT:
self.__parseTokens_fc_hdr_varinout(tokens)
elif self.state == self.STATE_IN_FC_HDR_VARTEMP:
self.__parseTokens_fc_hdr_vartemp(tokens)
elif self.state == self.STATE_IN_FC:
self.__parseTokens_fc(tokens)
elif self.state == self.STATE_IN_OB_HDR:
self.__parseTokens_ob_hdr(tokens)
elif self.state == self.STATE_IN_OB_HDR_VARTEMP:
self.__parseTokens_ob_hdr_vartemp(tokens)
elif self.state == self.STATE_IN_OB:
self.__parseTokens_ob(tokens)
else:
assert(0)
tokenizerState.reset()
def __parseTokens_global(self, tokens):
if self.flatLayout:
if not self.tree.obs:
self.tree.obs[1] = RawAwlOB(self.tree, 1)
if not self.tree.curBlock:
self.tree.curBlock = self.tree.obs[1]
insn = self.__parseInstruction(tokens)
self.tree.obs[1].insns.append(insn)
return
try:
if tokens[0].upper() == "DATA_BLOCK":
self.__setState(self.STATE_IN_DB_HDR)
if tokens[1].upper() != "DB":
raise AwlParserError("Invalid DB name")
try:
dbNumber = int(tokens[2], 10)
except ValueError:
raise AwlParserError("Invalid DB number")
self.tree.curBlock = RawAwlDB(self.tree, dbNumber)
self.tree.dbs[dbNumber] = self.tree.curBlock
return
if tokens[0].upper() == "FUNCTION_BLOCK":
self.__setState(self.STATE_IN_FB_HDR)
if tokens[1].upper() != "FB":
raise AwlParserError("Invalid FB name")
try:
fbNumber = int(tokens[2], 10)
except ValueError:
raise AwlParserError("Invalid FB number")
self.tree.curBlock = RawAwlFB(self.tree, fbNumber)
self.tree.fbs[fbNumber] = self.tree.curBlock
return
if tokens[0].upper() == "FUNCTION":
self.__setState(self.STATE_IN_FC_HDR)
if tokens[1].upper() != "FC":
raise AwlParserError("Invalid FC name")
try:
fcNumber = int(tokens[2], 10)
except ValueError:
raise AwlParserError("Invalid FC number")
if tokens[3] != ':':
raise AwlParserError("Missing colon after FC number")
retTypeTokens = tokens[4:]
if not retTypeTokens:
raise AwlParserError("Missing FC return type")
self.tree.curBlock = RawAwlFC(self.tree, fcNumber,
retTypeTokens)
self.tree.fcs[fcNumber] = self.tree.curBlock
return
if tokens[0].upper() == "ORGANIZATION_BLOCK":
self.__setState(self.STATE_IN_OB_HDR)
if tokens[1].upper() != "OB":
raise AwlParserError("Invalid OB name")
try:
obNumber = int(tokens[2], 10)
except ValueError:
raise AwlParserError("Invalid OB number")
self.tree.curBlock = RawAwlOB(self.tree, obNumber)
self.tree.obs[obNumber] = self.tree.curBlock
return
except IndexError as e:
raise AwlParserError("Missing token")
except ValueError as e:
raise AwlParserError("Invalid value")
raise AwlParserError("Unknown statement")
def __parseInstruction(self, tokens):
insn = RawAwlInsn(self.tree.curBlock)
insn.setLineNr(self.lineNr)
if tokens[0].endswith(":"):
# First token is a label
if len(tokens) <= 1:
raise AwlParserError("Invalid standalone label")
label = tokens[0][0:-1]
if not label or not RawAwlInsn.isValidLabel(label):
raise AwlParserError("Invalid label")
insn.setLabel(label)
tokens = tokens[1:]
if not tokens:
raise AwlParserError("No instruction name")
insn.setName(tokens[0])
tokens = tokens[1:]
if tokens:
# Operators to insn are specified
insn.setOperators(tokens)
return insn
def __parseTokens_db_hdr(self, tokens):
if tokens[0].upper() == "BEGIN":
self.__setState(self.STATE_IN_DB)
elif tokens[0].upper() == "TITLE":
pass#TODO
elif tokens[0].upper() == "VERSION":
pass#TODO
elif tokens[0].upper() == "STRUCT":
self.__setState(self.STATE_IN_DB_HDR_STRUCT)
elif tokens[0].upper() in ("FB", "SFB"):
try:
if len(tokens) != 2:
raise ValueError
fbName = tokens[0].upper()
fbNumber = int(tokens[1], 10)
except ValueError:
raise AwlParserError("Invalid FB/SFB binding")
self.tree.curBlock.fb = (fbName, fbNumber)
else:
raise AwlParserError("In DB header: Unknown tokens")
def __parse_var_generic(self, tokens, varList,
endToken,
mayHaveInitval=True):
if tokens[0].upper() == endToken:
return False
colonIdx = listIndex(tokens, ":")
assignIdx = listIndex(tokens, ":=")
if mayHaveInitval and colonIdx == 1 and assignIdx > colonIdx + 1:
name = tokens[0]
type = tokens[colonIdx+1:assignIdx]
val = tokens[assignIdx+1:]
field = RawAwlDataField(name, val, type)
varList.append(field)
elif colonIdx == 1:
name = tokens[0]
type = tokens[colonIdx+1:]
field = RawAwlDataField(name, None, type)
varList.append(field)
else:
raise AwlParserError("In variable section: Unknown tokens")
return True
def __parseTokens_db_hdr_struct(self, tokens):
if not self.__parse_var_generic(tokens,
varList = self.tree.curBlock.fields,
endToken = "END_STRUCT",
mayHaveInitval = False):
self.__setState(self.STATE_IN_DB_HDR)
def __parseTokens_db(self, tokens):
if tokens[0].upper() == "END_DATA_BLOCK":
self.__setState(self.STATE_GLOBAL)
return
if len(tokens) >= 3 and tokens[1] == ":=":
name, valueTokens = tokens[0], tokens[2:]
db = self.tree.curBlock
field = db.getByName(name)
if field:
field.valueTokens = valueTokens
else:
field = RawAwlDataField(name, valueTokens,
None)
db.fields.append(field)
else:
raise AwlParserError("In DB: Unknown tokens")
def __parseTokens_fb_hdr(self, tokens):
if tokens[0].upper() == "BEGIN":
self.__setState(self.STATE_IN_FB)
elif tokens[0].upper() == "TITLE":
pass#TODO
elif tokens[0].upper() == "VERSION":
pass#TODO
elif tokens[0].upper() == "VAR":
self.__setState(self.STATE_IN_FB_HDR_VAR)
elif tokens[0].upper() == "VAR_INPUT":
self.__setState(self.STATE_IN_FB_HDR_VARIN)
elif tokens[0].upper() == "VAR_OUTPUT":
self.__setState(self.STATE_IN_FB_HDR_VAROUT)
elif tokens[0].upper() == "VAR_IN_OUT":
self.__setState(self.STATE_IN_FB_HDR_VARINOUT)
elif tokens[0].upper() == "VAR_TEMP":
self.__setState(self.STATE_IN_FB_HDR_VARTEMP)
else:
raise AwlParserError("In FB: Unknown token")
def __parseTokens_fb_hdr_var(self, tokens):
if not self.__parse_var_generic(tokens,
varList = self.tree.curBlock.vars_static,
endToken = "END_VAR"):
self.__setState(self.STATE_IN_FB_HDR)
def __parseTokens_fb_hdr_varin(self, tokens):
if not self.__parse_var_generic(tokens,
varList = self.tree.curBlock.vars_in,
endToken = "END_VAR"):
self.__setState(self.STATE_IN_FB_HDR)
def __parseTokens_fb_hdr_varout(self, tokens):
if not self.__parse_var_generic(tokens,
varList = self.tree.curBlock.vars_out,
endToken = "END_VAR"):
self.__setState(self.STATE_IN_FB_HDR)
def __parseTokens_fb_hdr_varinout(self, tokens):
if not self.__parse_var_generic(tokens,
varList = self.tree.curBlock.vars_inout,
endToken = "END_VAR"):
self.__setState(self.STATE_IN_FB_HDR)
def __parseTokens_fb_hdr_vartemp(self, tokens):
if not self.__parse_var_generic(tokens,
varList = self.tree.curBlock.vars_temp,
endToken = "END_VAR",
mayHaveInitval = False):
self.__setState(self.STATE_IN_FB_HDR)
def __parseTokens_fb(self, 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(tokens)
self.tree.curBlock.insns.append(insn)
def __parseTokens_fc_hdr(self, tokens):
if tokens[0].upper() == "BEGIN":
self.__setState(self.STATE_IN_FC)
elif tokens[0].upper() == "TITLE":
pass#TODO
elif tokens[0].upper() == "VAR_INPUT":
self.__setState(self.STATE_IN_FC_HDR_VARIN)
elif tokens[0].upper() == "VAR_OUTPUT":
self.__setState(self.STATE_IN_FC_HDR_VAROUT)
elif tokens[0].upper() == "VAR_IN_OUT":
self.__setState(self.STATE_IN_FC_HDR_VARINOUT)
elif tokens[0].upper() == "VAR_TEMP":
self.__setState(self.STATE_IN_FC_HDR_VARTEMP)
else:
raise AwlParserError("In FC header: Unknown token")
def __parseTokens_fc_hdr_varin(self, tokens):
if not self.__parse_var_generic(tokens,
varList = self.tree.curBlock.vars_in,
endToken = "END_VAR",
mayHaveInitval=False):
self.__setState(self.STATE_IN_FC_HDR)
def __parseTokens_fc_hdr_varout(self, tokens):
if not self.__parse_var_generic(tokens,
varList = self.tree.curBlock.vars_out,
endToken = "END_VAR",
mayHaveInitval=False):
self.__setState(self.STATE_IN_FC_HDR)
def __parseTokens_fc_hdr_varinout(self, tokens):
if not self.__parse_var_generic(tokens,
varList = self.tree.curBlock.vars_inout,
endToken = "END_VAR",
mayHaveInitval=False):
self.__setState(self.STATE_IN_FC_HDR)
def __parseTokens_fc_hdr_vartemp(self, tokens):
if not self.__parse_var_generic(tokens,
varList = self.tree.curBlock.vars_temp,
endToken = "END_VAR",
mayHaveInitval=False):
self.__setState(self.STATE_IN_FC_HDR)
def __parseTokens_fc(self, 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(tokens)
self.tree.curBlock.insns.append(insn)
def __parseTokens_ob_hdr(self, tokens):
if tokens[0].upper() == "BEGIN":
self.__setState(self.STATE_IN_OB)
elif tokens[0].upper() == "VAR_TEMP":
self.__setState(self.STATE_IN_OB_HDR_VARTEMP)
elif tokens[0].upper() == "TITLE":
pass#TODO
elif tokens[0].upper() == "VERSION":
pass#TODO
else:
raise AwlParserError("In OB header: Unknown token")
def __parseTokens_ob_hdr_vartemp(self, tokens):
if not self.__parse_var_generic(tokens,
varList = self.tree.curBlock.vars_temp,
endToken = "END_VAR",
mayHaveInitval=False):
self.__setState(self.STATE_IN_OB_HDR)
def __parseTokens_ob(self, 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(tokens)
self.tree.curBlock.insns.append(insn)
def parseFile(self, filename):
self.parseData(awlFileRead(filename))
def parseData(self, data):
self.flatLayout = not re.match(r'.*^\s*ORGANIZATION_BLOCK\s+.*',
data, re.DOTALL | re.MULTILINE)
ex = None
try:
self.__tokenize(data)
except AwlParserError as e:
ex = e
if ex:
raise AwlParserError("Parser ERROR at AWL line %d:\n%s" %\
(self.lineNr, str(ex)))
def getParseTree(self):
return self.tree
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