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allendowney
GitHub Repository: allendowney/cpython
 Path: blob/main/Lib/curses/ascii.py
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"""Constants and membership tests for ASCII characters"""

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NUL     = 0x00  # ^@

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SOH     = 0x01  # ^A

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STX     = 0x02  # ^B

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ETX     = 0x03  # ^C

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EOT     = 0x04  # ^D

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ENQ     = 0x05  # ^E

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ACK     = 0x06  # ^F

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BEL     = 0x07  # ^G

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BS      = 0x08  # ^H

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TAB     = 0x09  # ^I

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HT      = 0x09  # ^I

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LF      = 0x0a  # ^J

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NL      = 0x0a  # ^J

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VT      = 0x0b  # ^K

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FF      = 0x0c  # ^L

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CR      = 0x0d  # ^M

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SO      = 0x0e  # ^N

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SI      = 0x0f  # ^O

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DLE     = 0x10  # ^P

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DC1     = 0x11  # ^Q

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DC2     = 0x12  # ^R

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DC3     = 0x13  # ^S

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DC4     = 0x14  # ^T

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NAK     = 0x15  # ^U

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SYN     = 0x16  # ^V

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ETB     = 0x17  # ^W

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CAN     = 0x18  # ^X

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EM      = 0x19  # ^Y

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SUB     = 0x1a  # ^Z

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ESC     = 0x1b  # ^[

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FS      = 0x1c  # ^\

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GS      = 0x1d  # ^]

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RS      = 0x1e  # ^^

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US      = 0x1f  # ^_

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SP      = 0x20  # space

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DEL     = 0x7f  # delete

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controlnames = [

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

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

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

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

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"SP"

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]

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def _ctoi(c):

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    if isinstance(c, str):

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        return ord(c)

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    else:

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        return c

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

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

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def isascii(c): return 0 <= _ctoi(c) <= 127          # ?

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def isblank(c): return _ctoi(c) in (9, 32)

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def iscntrl(c): return 0 <= _ctoi(c) <= 31 or _ctoi(c) == 127

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

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

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

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

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def ispunct(c): return isgraph(c) and not isalnum(c)

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

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

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

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

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def isctrl(c): return 0 <= _ctoi(c) < 32

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

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def ascii(c):

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    if isinstance(c, str):

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        return chr(_ctoi(c) & 0x7f)

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    else:

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        return _ctoi(c) & 0x7f

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def ctrl(c):

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    if isinstance(c, str):

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        return chr(_ctoi(c) & 0x1f)

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    else:

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        return _ctoi(c) & 0x1f

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def alt(c):

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    if isinstance(c, str):

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        return chr(_ctoi(c) | 0x80)

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    else:

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        return _ctoi(c) | 0x80

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def unctrl(c):

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    bits = _ctoi(c)

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    if bits == 0x7f:

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        rep = "^?"

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    elif isprint(bits & 0x7f):

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        rep = chr(bits & 0x7f)

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    else:

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

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    if bits & 0x80:

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        return "!" + rep

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    return rep

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