[REBOL] Pleac/rot13
From: Rebolinth::nodep::dds::nl at: 12-Oct-2003 13:29
Addons, still forgot to post them at rot13.org ;-)
Regards, Norman.
example (1) * the quick way *
rot13: func [ char [char! string!] { returns a rotate 13 on alphanumeric charatcers }
] [
char: to-char char
if any [ all [ char >= #"a" char <= #"m" ] all [ char >= #"A" char <= #"M" ] ] [ return
char
+ 13 ]
if any [ all [ char >= #"n" char <= #"z" ] all [ char >= #"N" char <= #"Z" ] ] [ return
char
- 13 ]
return char
]
example (2) * the lazy way *
str1: "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
str2: "nopqrstuvwxyzabcdefghijklmNOPQRSTUVWXYZABCDEFGHIJKLM"
rot13: func [ char ] [
either found? find str1 char [ return pick str2 index? find/case str1 char ][ return
char ]
]
example (3) * the long way *
; Define Global variables
ROT13FRSMA: "abcdefghijklmnopqrstuvwxyz"
ROT13TOSMA: "nopqrstuvwxyzabcdefghijklm"
ROT13FRBIG: "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
ROT13TOBIG: "NOPQRSTUVWXYZABCDEFGHIJKLM"
Rot_13: func[
"Translate a string to ROT13"
arg1 [string!] "String to be converted"
/local encode
][
encode: ""
while [(length? arg1) > 0][
either (to-integer first arg1) < 91 [
; We are talking about capitals
either attempt [index? find ROT13FRBIG first arg1][
encode: join encode pick ROT13TOBIG index? find ROT13FRBIG first arg1
][
encode: join encode first arg1
]
][
; Small letters from here
either attempt[index? find ROT13FRSMA first arg1][
encode: join encode pick ROT13TOSMA index? find ROT13FRSMA first arg1
][
encode: join encode first arg1
]
]
arg1: next arg1
]
encode
]
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