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Reformat arg parsing, add sli() function

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Python's native sequence slicing method calls for start with optional
stop and step.  This is sometimes exactly what you want, but especially
when parsing binary files, you're gonna want start/length instead.  If
start was an expression, messy.

In cppo, there's a function slyce that returns a sliced sequence using
start/length/step metrics, and this is used exclusively for slicing
sequences.  Except sometimes you really want Python's start/stop...

I figure: Let's do it Python's way with the slicing syntax, but instead
of seq[start:start+length], you can use sli(): seq[sli(start,length)].
It's not currently used that way, but it now can be.  :)
This commit is contained in:
T. Joseph Carter 2017-06-21 06:20:46 -07:00
parent 795694dbb2
commit a496c6bc0f
1 changed files with 23 additions and 19 deletions
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@ -705,7 +705,7 @@ def makeADfile():
if not g.AD:
return
touch(g.ADdir + "/" + g.targetName)
g.exFileData = bytearray(b'\x00' * 741)
g.exFileData = bytearray(741)
# ADv2 header
writecharsHex(g.exFileData, hexToDec("00"), "0005160700020000")
# number of entries
@ -935,6 +935,10 @@ def writecharsHex(arg1, arg2, arg3):
#---- IvanX general purpose functions ----#
def sli(start, length=1, ext=None):
"""return a slice object from an offset and length"""
return slice(start, start + length, ext)
def slyce(val, start_pos=0, length=1, reverse=False):
"""returns slice of object (but not a slice object)
allows specifying length, and 3.x "bytes" consistency"""
@ -1058,45 +1062,45 @@ args = sys.argv
while True: # breaks when there are no more arguments starting with dash
if (len(args) == 1):
if len(args) == 1:
usage()
if (slyce(args[1],0,1) != "-"):
if args[1][0] != '-':
break
if (args[1] == "-s"):
if args[1] == '-s':
g.nomsg = 1
args = args[1:] #shift
args = args[1:]
elif (args[1] == "-n"):
elif args[1] == '-n':
g.nodir = 1
args = args[1:] #shift
args = args[1:]
elif (args[1] == "-uc"):
elif args[1] == '-uc':
g.UC = 1
args = args[1:] #shift
args = args[1:]
elif (args[1] == "-ad"):
elif args[1] == '-ad':
g.AD = 1
g.PNAME = 1
args = args[1:] #shift
args = args[1:]
elif (args[1] == "-shk"):
elif args[1] == '-shk':
g.SHK = 1
args = args[1:] #shift
args = args[1:]
elif (args[1] == "-pro"):
elif args[1] == '-pro':
g.PNAME = 1
args = args[1:] #shift
args = args[1:]
elif (args[1] == "-e"):
elif args[1] == '-e':
g.EX = 1
g.PNAME = 1
args = args[1:] #shift
args = args[1:]
elif (args[1] == "-cat"):
elif args[1] == '-cat':
g.CAT = 1
args = args[1:] #shift
args = args[1:]
else:
usage()