File:  [gforth] / gforth / utf-8.fs
Revision 1.12: download - view: text, annotated - select for diffs
Wed Jan 5 16:24:33 2005 UTC (14 years, 9 months ago) by pazsan
Branches: MAIN
CVS tags: HEAD
another fix for u8>>

    1: \ UTF-8 handling                                       12dec04py
    2: 
    3: \ Copyright (C) 2004 Free Software Foundation, Inc.
    4: 
    5: \ This file is part of Gforth.
    6: 
    7: \ Gforth is free software; you can redistribute it and/or
    8: \ modify it under the terms of the GNU General Public License
    9: \ as published by the Free Software Foundation; either version 2
   10: \ of the License, or (at your option) any later version.
   11: 
   12: \ This program is distributed in the hope that it will be useful,
   13: \ but WITHOUT ANY WARRANTY; without even the implied warranty of
   14: \ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   15: \ GNU General Public License for more details.
   16: 
   17: \ You should have received a copy of the GNU General Public License
   18: \ along with this program; if not, write to the Free Software
   19: \ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
   20: 
   21: \ short: u8 means utf-8 encoded address
   22: 
   23: s" malformed UTF-8 character" exception Constant UTF-8-err
   24: 
   25: $80 Value maxascii
   26: 
   27: : u8len ( u8 -- n )
   28:     dup      maxascii u< IF  drop 1  EXIT  THEN \ special case ASCII
   29:     $800  2 >r
   30:     BEGIN  2dup u>=  WHILE  5 lshift r> 1+ >r  REPEAT
   31:     2drop r> ;
   32: 
   33: : u8@+ ( u8addr -- u8addr' u )
   34:     count  dup maxascii u< ?EXIT  \ special case ASCII
   35:     $7F and  $40 >r
   36:     BEGIN  dup r@ and  WHILE  r@ xor
   37: 	    6 lshift r> 5 lshift >r >r count
   38: 	    dup $C0 and $80 <> IF   UTF-8-err throw  THEN
   39: 	    $3F and r> or
   40:     REPEAT  rdrop ;
   41: 
   42: : u8!+ ( u u8addr -- u8addr' )
   43:     over maxascii u< IF  tuck c! 1+  EXIT  THEN \ special case ASCII
   44:     >r 0 swap  $3F
   45:     BEGIN  2dup u>  WHILE
   46: 	    2/ >r  dup $3F and $80 or swap 6 rshift r>
   47:     REPEAT  $7F xor 2* or  r>
   48:     BEGIN   over $80 u>= WHILE  tuck c! 1+  REPEAT  nip ;
   49: 
   50: \ plug-in so that char and '<char> work for UTF-8
   51: 
   52: [ifundef] char@ \ !! bootstrapping help
   53:     Defer char@ ( addr u -- char addr' u' )
   54:     :noname  over c@ -rot 1 /string ; IS char@
   55: [then]
   56: 
   57: :noname  ( addr u -- char addr' u' )
   58:     \ !! the if here seems to work around some breakage, but not
   59:     \ entirely; e.g., try '' with LANG=C.
   60:     dup 1 u<= IF defers char@ EXIT THEN
   61:     over + >r u8@+ swap r> over - ; IS char@
   62: 
   63: \ scan to next/previous character
   64: 
   65: : u8>> ( u8addr -- u8addr' )  u8@+ drop ;
   66: : u8<< ( u8addr -- u8addr' )
   67:     BEGIN  1- dup c@ $C0 and maxascii <>  UNTIL ;
   68: 
   69: \ utf key and emit
   70: 
   71: : u8key ( -- u )
   72:     defers key dup maxascii u< ?EXIT  \ special case ASCII
   73:     $7F and  $40 >r
   74:     BEGIN  dup r@ and  WHILE  r@ xor
   75: 	    6 lshift r> 5 lshift >r >r defers key
   76: 	    dup $C0 and $80 <> IF  UTF-8-err throw  THEN
   77: 	    $3F and r> or
   78:     REPEAT  rdrop ;
   79: 
   80: : u8emit ( u -- )
   81:     dup maxascii u< IF  defers emit  EXIT  THEN \ special case ASCII
   82:     0 swap  $3F
   83:     BEGIN  2dup u>  WHILE
   84: 	    2/ >r  dup $3F and $80 or swap 6 rshift r>
   85:     REPEAT  $7F xor 2* or
   86:     BEGIN   dup $80 u>= WHILE  defers emit  REPEAT  drop ;
   87: 
   88: \ input editor
   89: 
   90: [IFUNDEF] #esc  27 Constant #esc  [THEN]
   91: 
   92: : save-cursor ( -- )  #esc emit '7 emit ;
   93: : restore-cursor ( -- )  #esc emit '8 emit ;
   94: : .rest ( addr pos1 -- addr pos1 )
   95:     restore-cursor 2dup type ;
   96: : .all ( span addr pos1 -- span addr pos1 )
   97:     restore-cursor >r 2dup swap type r> ;
   98: 
   99: : <u8ins>  ( max span addr pos1 u8char -- max span addr pos2 )
  100:     >r  2over r@ u8len + u< IF  rdrop bell  EXIT  THEN
  101:     >string over r@ u8len + swap move 2dup chars + r@ swap u8!+ drop
  102:     r> u8len >r  rot r@ chars + -rot r> chars + ;
  103: : (u8ins)  ( max span addr pos1 u8char -- max span addr pos2 )
  104:     <u8ins> .all .rest ;
  105: : u8back  ( max span addr pos1 -- max span addr pos2 f )
  106:     dup  IF  over + u8<< over -  0 max .all .rest
  107:     ELSE  bell  THEN 0 ;
  108: : u8forw  ( max span addr pos1 -- max span addr pos2 f )
  109:     2 pick over <> IF  over + u8@+ u8emit over -  ELSE  bell  THEN 0 ;
  110: : (u8del)  ( max span addr pos1 -- max span addr pos2 )
  111:     over + dup u8<< tuck - >r over -
  112:     >string over r@ + -rot move
  113:     rot r> - -rot ;
  114: : ?u8del ( max span addr pos1 -- max span addr pos2 0 )
  115:   dup  IF  (u8del) .all 2 spaces .rest  THEN  0 ;
  116: : <u8del> ( max span addr pos1 -- max span addr pos2 0 )
  117:   2 pick over <>
  118:     IF  u8forw drop (u8del) .all 2 spaces .rest
  119:     ELSE  bell  THEN  0 ;
  120: : u8eof  2 pick over or 0=  IF  bye  ELSE  <u8del>  THEN ;
  121: 
  122: : u8first-pos  ( max span addr pos1 -- max span addr 0 0 )
  123:   drop 0 .all .rest 0 ;
  124: : u8end-pos  ( max span addr pos1 -- max span addr span 0 )
  125:   drop over .all 0 ;
  126: 
  127: 
  128: : u8clear-line ( max span addr pos1 -- max addr )
  129:     drop restore-cursor swap spaces restore-cursor ;
  130: : u8clear-tib ( max span addr pos -- max 0 addr 0 false )
  131:     u8clear-line 0 tuck dup ;
  132: 
  133: : (u8enter)  ( max span addr pos1 -- max span addr pos2 true )
  134:     >r end^ 2@ hist-setpos
  135:     2dup swap history write-line drop ( throw ) \ don't worry about errors
  136:     hist-pos 2dup backward^ 2! end^ 2!
  137:     r> .all space true ;
  138: 
  139: : u8kill-expand ( max span addr pos1 -- max span addr pos2 )
  140:     prefix-found cell+ @ ?dup IF  >r
  141: 	r@ - >string over r@ + -rot move
  142: 	rot r@ - -rot .all r> spaces .rest THEN ;
  143: 
  144: : insert   ( string length buffer size -- )
  145:     rot over min >r  r@ - ( left over )
  146:     over dup r@ +  rot move   r> move  ;
  147: 
  148: : u8tab-expand ( max span addr pos1 -- max span addr pos2 0 )
  149:     key? IF  #tab (u8ins) 0  EXIT  THEN
  150:     u8kill-expand 2dup extract-word dup 0= IF  nip EXIT  THEN
  151:     search-prefix tib-full?
  152:     IF    7 emit  2drop  prefix-off
  153:     ELSE  dup >r
  154: 	2>r >string r@ + 2r> 2swap insert
  155: 	r@ + rot r> + -rot
  156:     THEN
  157:     prefix-found @ IF  bl (u8ins)  ELSE  .all .rest  THEN  0 ;
  158: 
  159: : utf-8-io ( -- )
  160:     ['] u8forw       ctrl F bindkey
  161:     ['] u8back       ctrl B bindkey
  162:     ['] ?u8del       ctrl H bindkey
  163:     ['] u8eof        ctrl D bindkey
  164:     ['] <u8del>      ctrl X bindkey
  165:     ['] u8clear-tib  ctrl K bindkey
  166:     ['] u8first-pos  ctrl A bindkey
  167:     ['] u8end-pos    ctrl E bindkey
  168:     ['] (u8enter)    #lf    bindkey
  169:     ['] (u8enter)    #cr    bindkey
  170:     ['] u8tab-expand #tab   bindkey
  171:     ['] (u8ins)      IS insert-char
  172:     ['] kill-prefix  IS everychar
  173:     ['] save-cursor  IS everyline
  174:     ['] u8key        IS key
  175:     ['] u8emit       IS emit ;
  176: 

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