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Annotation of gforth/utf-8.fs, revision 1.7

1.1       pazsan      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: 
1.7     ! pazsan     23: s" malformed UTF-8 character" exception Constant UTF-8-err
        !            24: 
1.4       pazsan     25: : u8len ( u8 -- n )
1.1       pazsan     26:     dup      $80 u< IF  drop 1  EXIT  THEN \ special case ASCII
                     27:     $800  2 >r
                     28:     BEGIN  2dup u>=  WHILE  5 lshift r> 1+ >r  REPEAT
                     29:     2drop r> ;
                     30: 
                     31: : u8@+ ( u8addr -- u8addr' u )
                     32:     count  dup $80 and 0= ?EXIT  \ special case ASCII
                     33:     $7F and  $40 >r
                     34:     BEGIN  dup r@ and  WHILE  r@ xor
                     35:            6 lshift r> 5 lshift >r >r count
1.7     ! pazsan     36:            dup $C0 and $80 <> IF   UTF-8-err throw  THEN
1.1       pazsan     37:            $3F and r> or
                     38:     REPEAT  rdrop ;
                     39: 
                     40: : u8!+ ( u u8addr -- u8addr' )
                     41:     over $80 < IF  tuck c! 1+  EXIT  THEN \ special case ASCII
                     42:     >r 0 swap  $3F
                     43:     BEGIN  2dup u>  WHILE
                     44:            2/ >r  dup $3F and $80 or swap 6 rshift r>
                     45:     REPEAT  $7F xor 2* or  r>
                     46:     BEGIN   over $80 u>= WHILE  tuck c! 1+  REPEAT  nip ;
                     47: 
                     48: \ scan to next/previous character
                     49: 
                     50: : u8>> ( u8addr -- u8addr' )
                     51:     BEGIN  count $C0 and $80 <>  UNTIL ;
                     52: : u8<< ( u8addr -- u8addr' )
                     53:     BEGIN  1- dup c@ $C0 and $80 <>  UNTIL ;
                     54: 
                     55: \ utf key and emit
                     56: 
                     57: : u8key ( -- u )
                     58:     defers key dup $80 and 0= ?EXIT  \ special case ASCII
                     59:     $7F and  $40 >r
                     60:     BEGIN  dup r@ and  WHILE  r@ xor
                     61:            6 lshift r> 5 lshift >r >r defers key
1.7     ! pazsan     62:            dup $C0 and $80 <> IF  UTF-8-err throw  THEN
1.1       pazsan     63:            $3F and r> or
                     64:     REPEAT  rdrop ;
                     65: 
                     66: : u8emit ( u -- )
                     67:     dup $80 < IF  defers emit  EXIT  THEN \ special case ASCII
                     68:     0 swap  $3F
                     69:     BEGIN  2dup u>  WHILE
                     70:            2/ >r  dup $3F and $80 or swap 6 rshift r>
                     71:     REPEAT  $7F xor 2* or
                     72:     BEGIN   dup $80 u>= WHILE  defers emit  REPEAT  drop ;
                     73: 
                     74: \ input editor
                     75: 
1.7     ! pazsan     76: [IFUNDEF] #esc  27 Constant #esc  [THEN]
        !            77: 
        !            78: : save-cursor ( -- )  #esc emit '7 emit ;
        !            79: : restore-cursor ( -- )  #esc emit '8 emit ;
1.1       pazsan     80: : .rest ( addr pos1 -- addr pos1 )
                     81:     restore-cursor 2dup type ;
                     82: : .all ( span addr pos1 -- span addr pos1 )
                     83:     restore-cursor >r 2dup swap type r> ;
                     84: 
1.3       pazsan     85: : <u8ins>  ( max span addr pos1 u8char -- max span addr pos2 )
1.6       pazsan     86:     >r  2over r@ u8len + u< IF  rdrop bell  EXIT  THEN
                     87:     >string over r@ u8len + swap move 2dup chars + r@ swap u8!+ drop
1.3       pazsan     88:     r> u8len >r  rot r@ chars + -rot r> chars + ;
1.1       pazsan     89: : (u8ins)  ( max span addr pos1 u8char -- max span addr pos2 )
1.3       pazsan     90:     <u8ins> .all .rest ;
1.1       pazsan     91: : u8back  ( max span addr pos1 -- max span addr pos2 f )
1.2       pazsan     92:     dup  IF  over + u8<< over -  0 max .all .rest
1.6       pazsan     93:     ELSE  bell  THEN 0 ;
1.1       pazsan     94: : u8forw  ( max span addr pos1 -- max span addr pos2 f )
1.6       pazsan     95:     2 pick over <> IF  over + u8@+ u8emit over -  ELSE  bell  THEN 0 ;
1.1       pazsan     96: : (u8del)  ( max span addr pos1 -- max span addr pos2 )
                     97:     over + dup u8<< tuck - >r over -
                     98:     >string over r@ + -rot move
1.3       pazsan     99:     rot r> - -rot ;
1.1       pazsan    100: : ?u8del ( max span addr pos1 -- max span addr pos2 0 )
1.3       pazsan    101:   dup  IF  (u8del) .all 2 spaces .rest  THEN  0 ;
1.1       pazsan    102: : <u8del> ( max span addr pos1 -- max span addr pos2 0 )
                    103:   2 pick over <>
1.3       pazsan    104:     IF  u8forw drop (u8del) .all 2 spaces .rest
1.6       pazsan    105:     ELSE  bell  THEN  0 ;
1.1       pazsan    106: : u8eof  2 pick over or 0=  IF  bye  ELSE  <u8del>  THEN ;
                    107: 
1.3       pazsan    108: : u8first-pos  ( max span addr pos1 -- max span addr 0 0 )
                    109:   drop 0 .all .rest 0 ;
                    110: : u8end-pos  ( max span addr pos1 -- max span addr span 0 )
                    111:   drop over .all 0 ;
                    112: 
                    113: 
                    114: : u8clear-line ( max span addr pos1 -- max addr )
                    115:     drop restore-cursor swap spaces restore-cursor ;
                    116: : u8clear-tib ( max span addr pos -- max 0 addr 0 false )
                    117:     u8clear-line 0 tuck dup ;
                    118: 
                    119: : (u8enter)  ( max span addr pos1 -- max span addr pos2 true )
                    120:     >r end^ 2@ hist-setpos
                    121:     2dup swap history write-line drop ( throw ) \ don't worry about errors
                    122:     hist-pos 2dup backward^ 2! end^ 2!
                    123:     r> .all space true ;
                    124: 
                    125: : u8kill-expand ( max span addr pos1 -- max span addr pos2 )
                    126:     prefix-found cell+ @ ?dup IF  >r
                    127:        r@ - >string over r@ + -rot move
                    128:        rot r@ - -rot .all r> spaces .rest THEN ;
                    129: 
                    130: : insert   ( string length buffer size -- )
                    131:     rot over min >r  r@ - ( left over )
                    132:     over dup r@ +  rot move   r> move  ;
                    133: 
                    134: : u8tab-expand ( max span addr pos1 -- max span addr pos2 0 )
                    135:     key? IF  #tab (u8ins) 0  EXIT  THEN
                    136:     u8kill-expand 2dup extract-word dup 0= IF  nip EXIT  THEN
1.5       pazsan    137:     search-prefix tib-full?
                    138:     IF    7 emit  2drop  prefix-off
1.3       pazsan    139:     ELSE  dup >r
                    140:        2>r >string r@ + 2r> 2swap insert
                    141:        r@ + rot r> + -rot
                    142:     THEN
1.5       pazsan    143:     prefix-found @ IF  bl (u8ins)  ELSE  .all .rest  THEN  0 ;
1.3       pazsan    144: 
1.4       pazsan    145: : utf-8-io ( -- )
                    146:     ['] u8forw       ctrl F bindkey
                    147:     ['] u8back       ctrl B bindkey
                    148:     ['] ?u8del       ctrl H bindkey
                    149:     ['] u8eof        ctrl D bindkey
                    150:     ['] <u8del>      ctrl X bindkey
                    151:     ['] u8clear-tib  ctrl K bindkey
                    152:     ['] u8first-pos  ctrl A bindkey
                    153:     ['] u8end-pos    ctrl E bindkey
                    154:     ['] (u8enter)    #lf    bindkey
                    155:     ['] (u8enter)    #cr    bindkey
                    156:     ['] u8tab-expand #tab   bindkey
                    157:     ['] (u8ins)      IS insert-char
1.5       pazsan    158:     ['] kill-prefix  IS everychar
1.4       pazsan    159:     ['] save-cursor  IS everyline
                    160:     ['] u8key        IS key
                    161:     ['] u8emit       IS emit ;
                    162: