Escape sequences for "invalid" characters about gauche

[qykth-git]

Here is my idea of those raw embedded octets.

\x and ; comes from R7RS, and *comes from incomplete string notation.
Last ; is required to split embedded octets and normal characters.
Use , to embed 2 or more octets at once.

;; one octet
"\x*1;" "\x*2;" "\x*a;" "\x*b;"
"\x*01;" "\x*02;" "\x*0a;" "\x*0b;"
"\x*01;\x*02;\x*03;"

;; multiple octets
"\x*1,2,3,4,a,b,c,d;"
"\x*01,23,34,ab,cd,ef;"

;; embed raw octets among normal charactors
"foo\x*ab,cd,1,2,3,04,05,06;bar"
"\x0041;\x61;\x*41,61;" ;; => "A", "a", embedded 0x41, embedded 0x61

;; long line concatenation
   "foo\x*ab,cd,\
    01,02,03,\
    ab,cd;bar"

;; those are all embedded 0x01
"\x*1;"
"\x*001;"
"\x*000001;"

;; error
"\x*1ff;" ;; error: octet exceeds 0xff

[shirok]

I like it.