"""Constants and membership tests for ASCII characters"""

NUL     = 0x00  # ^@

SOH     = 0x01  # ^A

STX     = 0x02  # ^B

ETX     = 0x03  # ^C

EOT     = 0x04  # ^D

ENQ     = 0x05  # ^E

ACK     = 0x06  # ^F

BEL     = 0x07  # ^G

BS      = 0x08  # ^H

TAB     = 0x09  # ^I

HT      = 0x09  # ^I

LF      = 0x0a  # ^J

NL      = 0x0a  # ^J

VT      = 0x0b  # ^K

FF      = 0x0c  # ^L

CR      = 0x0d  # ^M

SO      = 0x0e  # ^N

SI      = 0x0f  # ^O

DLE     = 0x10  # ^P

DC1     = 0x11  # ^Q

DC2     = 0x12  # ^R

DC3     = 0x13  # ^S

DC4     = 0x14  # ^T

NAK     = 0x15  # ^U

SYN     = 0x16  # ^V

ETB     = 0x17  # ^W

CAN     = 0x18  # ^X

EM      = 0x19  # ^Y

SUB     = 0x1a  # ^Z

ESC     = 0x1b  # ^[

FS      = 0x1c  # ^\

GS      = 0x1d  # ^]

RS      = 0x1e  # ^^

US      = 0x1f  # ^_

SP      = 0x20  # space

DEL     = 0x7f  # delete

controlnames = [

"NUL", "SOH", "STX", "ETX", "EOT", "ENQ", "ACK", "BEL",

"BS",  "HT",  "LF",  "VT",  "FF",  "CR",  "SO",  "SI",

"DLE", "DC1", "DC2", "DC3", "DC4", "NAK", "SYN", "ETB",

"CAN", "EM",  "SUB", "ESC", "FS",  "GS",  "RS",  "US",

"SP"

]

def _ctoi(c):

    if type(c) == type(""):

        return ord(c)

    else:

        return c

def isalnum(c): return isalpha(c) or isdigit(c)

def isalpha(c): return isupper(c) or islower(c)

def isascii(c): return _ctoi(c) <= 127          # ?

def isblank(c): return _ctoi(c) in (8,32)

def iscntrl(c): return _ctoi(c) <= 31

def isdigit(c): return _ctoi(c) >= 48 and _ctoi(c) <= 57

def isgraph(c): return _ctoi(c) >= 33 and _ctoi(c) <= 126

def islower(c): return _ctoi(c) >= 97 and _ctoi(c) <= 122

def isprint(c): return _ctoi(c) >= 32 and _ctoi(c) <= 126

def ispunct(c): return _ctoi(c) != 32 and not isalnum(c)

def isspace(c): return _ctoi(c) in (9, 10, 11, 12, 13, 32)

def isupper(c): return _ctoi(c) >= 65 and _ctoi(c) <= 90

def isxdigit(c): return isdigit(c) or \

    (_ctoi(c) >= 65 and _ctoi(c) <= 70) or (_ctoi(c) >= 97 and _ctoi(c) <= 102)

def isctrl(c): return _ctoi(c) < 32

def ismeta(c): return _ctoi(c) > 127

def ascii(c):

    if type(c) == type(""):

        return chr(_ctoi(c) & 0x7f)

    else:

        return _ctoi(c) & 0x7f

def ctrl(c):

    if type(c) == type(""):

        return chr(_ctoi(c) & 0x1f)

    else:

        return _ctoi(c) & 0x1f

def alt(c):

    if type(c) == type(""):

        return chr(_ctoi(c) | 0x80)

    else:

        return _ctoi(c) | 0x80

def unctrl(c):

    bits = _ctoi(c)

    if bits == 0x7f:

        rep = "^?"

    elif isprint(bits & 0x7f):

        rep = chr(bits & 0x7f)

    else:

        rep = "^" + chr(((bits & 0x7f) | 0x20) + 0x20)

    if bits & 0x80:

        return "!" + rep

    return rep