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tn3270.py
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tn3270.py
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from datetime import datetime
from colorama import Fore,Back,Style,init
# Object to hold field details
class Field:
def __init__(self, contents, row, col, rawstatus, printable=0, protected=0, numeric=0, hidden=0, normnsel=0, normsel=0, highsel=0, zeronsel=0, reserved=0, modify=0):
self.contents = contents
self.row = row
self.col = col
self.rawstatus = rawstatus
self.printable = printable
self.protected = protected
self.numeric = numeric
self.hidden = hidden
self.normnsel = normnsel
self.normsel = normsel
self.highsel = highsel
self.zeronsel = zeronsel
self.reserved = reserved
self.modify = modify
def __repr__(self):
a = "<Field row:",`self.row`," col:",`self.col`," contents:",self.contents.strip(),">"
return ''.join(a)
def __str__(self):
return self.contents
def __len__(self):
return len(self.contents)
# Object to hold a screen from x3270
class Screen:
def __init__(self, rawbuff):
self.rawbuffer = rawbuff
self.rows = len(self.rawbuffer)
self.cols = len(self.rawbuffer[0])
#From x3270 defines
self.__FA_PRINTABLE = 0xc0 #these make the character "printable"
self.__FA_PROTECT = 0x20 #unprotected (0) / protected (1)
self.__FA_NUMERIC = 0x10 #alphanumeric (0) /numeric (1)Skip?
self.__FA_HIDDEN = 0x0c #display/selector pen detectable:
self.__FA_INT_NORM_NSEL = 0x00 # 00 normal, non-detect
self.__FA_INT_NORM_SEL = 0x04 # 01 normal, detectable
self.__FA_INT_HIGH_SEL = 0x08 # 10 intensified, detectable
self.__FA_INT_ZERO_NSEL = 0x0c # 11 nondisplay, non-detect, same as hidden
self.__FA_RESERVED = 0x02 #must be 0
self.__FA_MODIFY = 0x01 #modified (1)
@property
# Dump the hex without the field & formatting markers
def plainbuffer(self):
plnbuf = list()
for line in self.rawbuffer:
splitline = line.split(' ')
plainline = []
for i in splitline:
if len(i) == 2: #Not a field marker
plainline.append(i)
else:
plainline.append('00') #Use a NULL instead of a field marker
plnbuf.append(plainline)
return plnbuf
@property
# Give us a string version of plainbuffer
def stringbuffer(self):
strbuf = list()
for line in self.plainbuffer:
newstr = ''.join(line).decode("hex")
strbuf.append(newstr)
return strbuf
# A pretty printed version converting NULL to ' '
def __str__(self):
return '\n'.join(self.stringbuffer).replace('\x00',' ')
def __repr__(self):
a = "<Screen rows:",`self.rows`," cols:",`self.cols`," firstline:",self.stringbuffer[0],">"
return ''.join(a)
@property
# Highlight different fields so we can see what is really going on on the screen
# This looks at field markers only and ignores colours asked for by the host
def colorbuffer(self):
colbuf = list()
colbuf.append(Fore.RED) #Highlight unfield'ed text
counter = 0 #for line numbers
for line in self.rawbuffer:
newline = list()
newline.append('{:>2}'.format(counter)+' ') #line no
counter += 1
for i in line.split(' '):
# SF(c0=c8) is example of StartField markup
if len(i) > 3 and i.find('SF(') >= 0:
attrib = int(i[3:5],16)
val = int(i[6:8],16)
foreflag = False
backflag = False
styleflag = False
if (val | self.__FA_HIDDEN) == val:
newline.append(Back.RED)
backflag = True
if (val | self.__FA_MODIFY) == val:
newline.append(Fore.YELLOW)
newline.append(Style.BRIGHT)
foreflag = True
styleflag = True
if (val | self.__FA_PROTECT) != val:
newline.append(Back.GREEN)
backflag = True
#if (val | self.__FA_INT_HIGH_SEL) == val:
#newline.append(Style.BRIGHT)
#styleflag = True
if not foreflag:
newline.append(Fore.RESET)
if not backflag:
newline.append(Back.RESET)
if not styleflag:
newline.append(Style.NORMAL)
newline.append(u'\u2219') #Field marker
elif len(i) == 2:
if i == '00':
newline.append(u"\u2400")
else:
newline.append(i.decode("hex"))
#newline.append(Fore.RESET+Back.RESET+Style.RESET_ALL)
colbuf.append(''.join(newline))
strcolbuf = '\n'.join(colbuf) + Fore.RESET + Back.RESET
return strcolbuf
@property
# Display the screen as it would look in an emulator
# This looks at field markers only and ignores colours asked for by the host
# TODO: implement CF parsing
def emubuffer(self):
colbuf = list()
for line in self.rawbuffer:
newline = list()
for i in line.split(' '):
# SF(c0=c8) is example of StartField markup
if len(i) > 3 and i.find('SF(') >= 0:
attrib = int(i[3:5],16)
val = int(i[6:8],16)
newline.append(u' ') #Field marker
modflag = False
hideflag = False
if (val | self.__FA_PROTECT) != val:
modflag = True
newline.append(Back.WHITE)
newline.append(Fore.BLACK)
if (val | self.__FA_HIDDEN) == val:
hideflag = True
if not modflag:
newline.append(Fore.RESET)
newline.append(Back.RESET)
elif len(i) == 2:
if i == '00':
newline.append(u' ')
elif hideflag:
newline.append(u' ')
else:
newline.append(i.decode("hex"))
colbuf.append(''.join(newline))
strcolbuf = '\n'.join(colbuf)
return strcolbuf
@property
# Return a DOM of sorts with each field and it's characteristics
def fields(self):
field_list = list()
row = 0
for line in self.rawbuffer:
col = 0
for i in line.split(' '):
# SF(c0=c8) is example of StartField markup
if len(i) > 3 and i.find('SF(') >= 0:
attrib = int(i[3:5],16)
val = int(i[6:8],16)
printable = 0
protected = 0
numeric = 0
hidden = 0
normnsel = 0
normsel = 0
highsel = 0
zeronsel = 0
reserved = 0
modify = 0
rawstatus = i #store the raw status for later implementation of SA()
if (val | self.__FA_PRINTABLE) == val:
printable = 1
if (val | self.__FA_PROTECT ) == val:
protected = 1
if (val | self.__FA_NUMERIC ) == val:
numeric = 1
if (val | self.__FA_HIDDEN) == val:
hidden = 1
if (val | self.__FA_INT_NORM_NSEL) == val:
normnsel = 1
if (val | self.__FA_INT_NORM_SEL) == val:
normsel = 1
if (val | self.__FA_INT_HIGH_SEL) == val:
highsel = 1
if (val | self.__FA_INT_ZERO_NSEL) == val:
zeronsel = 1
if (val | self.__FA_RESERVED) == val:
reserved = 1
if (val | self.__FA_MODIFY) == val:
modify = 1
field = Field('', row, col, rawstatus, printable, protected, numeric, hidden, normnsel, normsel, highsel, zeronsel, reserved, modify)
field_list.append(field)
# Add the character to the last field entity added
elif len(i) == 2:
contents = i.decode("hex")
if len(field_list) > 0:
field_list[len(field_list)-1].contents += contents
col += 1
row += 1
return field_list
@property
def protected_fields(self):
try:
res = filter(lambda x: x.protected == 1, self.fields)
except IndexError:
res = []
return res
@property
def input_fields(self):
try:
res = filter(lambda x: x.protected == 0, self.fields)
except IndexError:
res = []
return res
@property
def hidden_fields(self):
try:
res = filter(lambda x: x.hidden == 1, self.fields)
except IndexError:
res = []
return res
@property
def modified_fields(self):
try:
res = filter(lambda x: x.modify == 1, self.fields)
except IndexError:
res = []
return res
# Object to hold an single tn3270 "transaction" i.e. request/response & timestamp
class Transaction:
def __init__(self, request, response, data, key='enter', host='', comment=''):
# these should be Screen objects
self.request = request
self.response = response
self.data = data #Data that was submitted
# For now I'm going to assume the last item in the list is the newest
self.timestamp = datetime.now()
# What key initiated the transaction
self.key = key
self.comment = comment
self.host = host
def __repr__(self):
a = "<Transaction time:",str(self.timestamp)," host:",self.host,\
" trigger:",self.key,"\n",\
" Req : ",repr(self.request),"\n",\
" Data: ",repr(self.data),"\n",\
" Resp: ",repr(self.response),">"
return ''.join(a)
class History:
def __init__(self):
self.timeline = list()
def __getitem__(self, index):
return self.timeline[index]
def __repr__(self):
return "<History timeline:\n"+repr(self.timeline)
def __len__(self):
return len(self.timeline)
def append(self, transaction):
self.timeline.append(transaction)
def last(self):
return self.timeline[len(self.timeline)-1]
def count(self):
return len(self.timeline)