[gforth] / gforth / utf-8.fs  

gforth: gforth/utf-8.fs

Diff for /gforth/utf-8.fs between version 1.12 and 1.13

version 1.12, Wed Jan 5 16:24:33 2005 UTC version 1.13, Wed Jan 5 22:13:40 2005 UTC
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 s" malformed UTF-8 character" exception Constant UTF-8-err  s" malformed UTF-8 character" exception Constant UTF-8-err
   
 $80 Value maxascii  $80 Value max-single-byte
   
 : u8len ( u8 -- n )  : u8len ( u8 -- n )
     dup      maxascii u< IF  drop 1  EXIT  THEN \ special case ASCII      dup      max-single-byte u< IF  drop 1  EXIT  THEN \ special case ASCII
     $800  2 >r      $800  2 >r
     BEGIN  2dup u>=  WHILE  5 lshift r> 1+ >r  REPEAT      BEGIN  2dup u>=  WHILE  5 lshift r> 1+ >r  REPEAT
     2drop r> ;      2drop r> ;
   
 : u8@+ ( u8addr -- u8addr' u )  : u8@+ ( u8addr -- u8addr' u )
     count  dup maxascii u< ?EXIT  \ special case ASCII      count  dup max-single-byte u< ?EXIT  \ special case ASCII
     $7F and  $40 >r      $7F and  $40 >r
     BEGIN  dup r@ and  WHILE  r@ xor      BEGIN  dup r@ and  WHILE  r@ xor
             6 lshift r> 5 lshift >r >r count              6 lshift r> 5 lshift >r >r count
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     REPEAT  rdrop ;      REPEAT  rdrop ;
   
 : u8!+ ( u u8addr -- u8addr' )  : u8!+ ( u u8addr -- u8addr' )
     over maxascii u< IF  tuck c! 1+  EXIT  THEN \ special case ASCII      over max-single-byte u< IF  tuck c! 1+  EXIT  THEN \ special case ASCII
     >r 0 swap  $3F      >r 0 swap  $3F
     BEGIN  2dup u>  WHILE      BEGIN  2dup u>  WHILE
             2/ >r  dup $3F and $80 or swap 6 rshift r>              2/ >r  dup $3F and $80 or swap 6 rshift r>
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 \ scan to next/previous character  \ scan to next/previous character
   
   \ alternative names: u8char+ u8char-
   
 : u8>> ( u8addr -- u8addr' )  u8@+ drop ;  : u8>> ( u8addr -- u8addr' )  u8@+ drop ;
 : u8<< ( u8addr -- u8addr' )  : u8<< ( u8addr -- u8addr' )
     BEGIN  1- dup c@ $C0 and maxascii <>  UNTIL ;      BEGIN  1- dup c@ $C0 and max-single-byte <>  UNTIL ;
   
 \ utf key and emit  \ utf key and emit
   
 : u8key ( -- u )  : u8key ( -- u )
     defers key dup maxascii u< ?EXIT  \ special case ASCII      defers key dup max-single-byte u< ?EXIT  \ special case ASCII
     $7F and  $40 >r      $7F and  $40 >r
     BEGIN  dup r@ and  WHILE  r@ xor      BEGIN  dup r@ and  WHILE  r@ xor
             6 lshift r> 5 lshift >r >r defers key              6 lshift r> 5 lshift >r >r defers key
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     REPEAT  rdrop ;      REPEAT  rdrop ;
   
 : u8emit ( u -- )  : u8emit ( u -- )
     dup maxascii u< IF  defers emit  EXIT  THEN \ special case ASCII      dup max-single-byte u< IF  defers emit  EXIT  THEN \ special case ASCII
     0 swap  $3F      0 swap  $3F
     BEGIN  2dup u>  WHILE      BEGIN  2dup u>  WHILE
             2/ >r  dup $3F and $80 or swap 6 rshift r>              2/ >r  dup $3F and $80 or swap 6 rshift r>
     REPEAT  $7F xor 2* or      REPEAT  $7F xor 2* or
     BEGIN   dup $80 u>= WHILE  defers emit  REPEAT  drop ;      BEGIN   dup $80 u>= WHILE  defers emit  REPEAT  drop ;
   
   \ utf-8 stuff for xchars
   
   : +u8/string ( c-addr1 u1 -- c-addr2 u2 )
       over dup u8>> swap - /string ;
   
   : -u8/string ( c-addr1 u1 -- c-addr2 u2 )
       over dup u8<< swap - /string ;
   
   : u8@ ( c-addr -- u )
       u8@+ nip ;
   
   : u8!+? ( xc xc-addr1 u1 -- xc-addr2 u2 f )
       >r over u8len r@ over u< if ( xc xc-addr1 len r: u1 )
           \ not enough space
           drop nip r> false
       else
           >r u8!+ r> r> swap - true
       then ;
   
   : u8addrlen ( u8-addr -- u )
       \ length of UTF-8 char starting at u8-addr (accesses only u8-addr)
       c@
       dup $80 u< if drop 1 exit endif
       dup $c0 u< if UTF-8-err throw endif
       dup $e0 u< if drop 2 exit endif
       dup $f0 u< if drop 3 exit endif
       dup $f8 u< if drop 4 exit endif
       dup $fc u< if drop 5 exit endif
       dup $fe u< if drop 6 exit endif
       UTF-8-err throw ;
   
   : -u8trailing-garbage ( addr u1 -- addr u2 )
       2dup + dup u8<< ( addr u1 end1 end2 )
       2dup dup u8addrlen + = if \ last character ok
           2drop
       else
           nip nip over -
       then ;
   
   : set-encoding-utf-8 ( -- )
       ['] u8emit is xemit
       ['] u8key is xkey
       ['] u8>> is xchar+
       ['] u8<< is xchar-
       ['] +u8/string is +x/string
       ['] -u8/string is -x/string
       ['] u8@ is xc@
       ['] u8!+? is xc!+?
       ['] u8@+ is xc@+
       ['] u8len is xc-size
       ['] -u8trailing-garbage is -trailing-garbage
   ;
   
 \ input editor  \ input editor
   
 [IFUNDEF] #esc  27 Constant #esc  [THEN]  [IFUNDEF] #esc  27 Constant #esc  [THEN]

Generate output suitable for use with a patch program
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