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      1 """Constants and membership tests for ASCII characters"""
      2 
      3 NUL     = 0x00  # ^@
      4 SOH     = 0x01  # ^A
      5 STX     = 0x02  # ^B
      6 ETX     = 0x03  # ^C
      7 EOT     = 0x04  # ^D
      8 ENQ     = 0x05  # ^E
      9 ACK     = 0x06  # ^F
     10 BEL     = 0x07  # ^G
     11 BS      = 0x08  # ^H
     12 TAB     = 0x09  # ^I
     13 HT      = 0x09  # ^I
     14 LF      = 0x0a  # ^J
     15 NL      = 0x0a  # ^J
     16 VT      = 0x0b  # ^K
     17 FF      = 0x0c  # ^L
     18 CR      = 0x0d  # ^M
     19 SO      = 0x0e  # ^N
     20 SI      = 0x0f  # ^O
     21 DLE     = 0x10  # ^P
     22 DC1     = 0x11  # ^Q
     23 DC2     = 0x12  # ^R
     24 DC3     = 0x13  # ^S
     25 DC4     = 0x14  # ^T
     26 NAK     = 0x15  # ^U
     27 SYN     = 0x16  # ^V
     28 ETB     = 0x17  # ^W
     29 CAN     = 0x18  # ^X
     30 EM      = 0x19  # ^Y
     31 SUB     = 0x1a  # ^Z
     32 ESC     = 0x1b  # ^[
     33 FS      = 0x1c  # ^\
     34 GS      = 0x1d  # ^]
     35 RS      = 0x1e  # ^^
     36 US      = 0x1f  # ^_
     37 SP      = 0x20  # space
     38 DEL     = 0x7f  # delete
     39 
     40 controlnames = [
     41 "NUL", "SOH", "STX", "ETX", "EOT", "ENQ", "ACK", "BEL",
     42 "BS",  "HT",  "LF",  "VT",  "FF",  "CR",  "SO",  "SI",
     43 "DLE", "DC1", "DC2", "DC3", "DC4", "NAK", "SYN", "ETB",
     44 "CAN", "EM",  "SUB", "ESC", "FS",  "GS",  "RS",  "US",
     45 "SP"
     46 ]
     47 
     48 def _ctoi(c):
     49     if type(c) == type(""):
     50         return ord(c)
     51     else:
     52         return c
     53 
     54 def isalnum(c): return isalpha(c) or isdigit(c)
     55 def isalpha(c): return isupper(c) or islower(c)
     56 def isascii(c): return _ctoi(c) <= 127          # ?
     57 def isblank(c): return _ctoi(c) in (8,32)
     58 def iscntrl(c): return _ctoi(c) <= 31
     59 def isdigit(c): return _ctoi(c) >= 48 and _ctoi(c) <= 57
     60 def isgraph(c): return _ctoi(c) >= 33 and _ctoi(c) <= 126
     61 def islower(c): return _ctoi(c) >= 97 and _ctoi(c) <= 122
     62 def isprint(c): return _ctoi(c) >= 32 and _ctoi(c) <= 126
     63 def ispunct(c): return _ctoi(c) != 32 and not isalnum(c)
     64 def isspace(c): return _ctoi(c) in (9, 10, 11, 12, 13, 32)
     65 def isupper(c): return _ctoi(c) >= 65 and _ctoi(c) <= 90
     66 def isxdigit(c): return isdigit(c) or \
     67     (_ctoi(c) >= 65 and _ctoi(c) <= 70) or (_ctoi(c) >= 97 and _ctoi(c) <= 102)
     68 def isctrl(c): return _ctoi(c) < 32
     69 def ismeta(c): return _ctoi(c) > 127
     70 
     71 def ascii(c):
     72     if type(c) == type(""):
     73         return chr(_ctoi(c) & 0x7f)
     74     else:
     75         return _ctoi(c) & 0x7f
     76 
     77 def ctrl(c):
     78     if type(c) == type(""):
     79         return chr(_ctoi(c) & 0x1f)
     80     else:
     81         return _ctoi(c) & 0x1f
     82 
     83 def alt(c):
     84     if type(c) == type(""):
     85         return chr(_ctoi(c) | 0x80)
     86     else:
     87         return _ctoi(c) | 0x80
     88 
     89 def unctrl(c):
     90     bits = _ctoi(c)
     91     if bits == 0x7f:
     92         rep = "^?"
     93     elif isprint(bits & 0x7f):
     94         rep = chr(bits & 0x7f)
     95     else:
     96         rep = "^" + chr(((bits & 0x7f) | 0x20) + 0x20)
     97     if bits & 0x80:
     98         return "!" + rep
     99     return rep
    100