Annotation of gforth/utf-8.fs, revision 1.13
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:
1.13 ! anton 25: $80 Value max-single-byte
1.10 pazsan 26:
1.4 pazsan 27: : u8len ( u8 -- n )
1.13 ! anton 28: dup max-single-byte u< IF drop 1 EXIT THEN \ special case ASCII
1.1 pazsan 29: $800 2 >r
30: BEGIN 2dup u>= WHILE 5 lshift r> 1+ >r REPEAT
31: 2drop r> ;
32:
33: : u8@+ ( u8addr -- u8addr' u )
1.13 ! anton 34: count dup max-single-byte u< ?EXIT \ special case ASCII
1.1 pazsan 35: $7F and $40 >r
36: BEGIN dup r@ and WHILE r@ xor
37: 6 lshift r> 5 lshift >r >r count
1.7 pazsan 38: dup $C0 and $80 <> IF UTF-8-err throw THEN
1.1 pazsan 39: $3F and r> or
40: REPEAT rdrop ;
41:
42: : u8!+ ( u u8addr -- u8addr' )
1.13 ! anton 43: over max-single-byte u< IF tuck c! 1+ EXIT THEN \ special case ASCII
1.1 pazsan 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:
1.8 pazsan 50: \ plug-in so that char and '<char> work for UTF-8
51:
1.9 anton 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:
1.8 pazsan 57: :noname ( addr u -- char addr' u' )
1.9 anton 58: \ !! the if here seems to work around some breakage, but not
59: \ entirely; e.g., try 'ç' with LANG=C.
60: dup 1 u<= IF defers char@ EXIT THEN
1.8 pazsan 61: over + >r u8@+ swap r> over - ; IS char@
62:
1.1 pazsan 63: \ scan to next/previous character
64:
1.13 ! anton 65: \ alternative names: u8char+ u8char-
! 66:
1.12 pazsan 67: : u8>> ( u8addr -- u8addr' ) u8@+ drop ;
1.1 pazsan 68: : u8<< ( u8addr -- u8addr' )
1.13 ! anton 69: BEGIN 1- dup c@ $C0 and max-single-byte <> UNTIL ;
1.1 pazsan 70:
71: \ utf key and emit
72:
73: : u8key ( -- u )
1.13 ! anton 74: defers key dup max-single-byte u< ?EXIT \ special case ASCII
1.1 pazsan 75: $7F and $40 >r
76: BEGIN dup r@ and WHILE r@ xor
77: 6 lshift r> 5 lshift >r >r defers key
1.7 pazsan 78: dup $C0 and $80 <> IF UTF-8-err throw THEN
1.1 pazsan 79: $3F and r> or
80: REPEAT rdrop ;
81:
82: : u8emit ( u -- )
1.13 ! anton 83: dup max-single-byte u< IF defers emit EXIT THEN \ special case ASCII
1.1 pazsan 84: 0 swap $3F
85: BEGIN 2dup u> WHILE
86: 2/ >r dup $3F and $80 or swap 6 rshift r>
87: REPEAT $7F xor 2* or
88: BEGIN dup $80 u>= WHILE defers emit REPEAT drop ;
1.13 ! anton 89:
! 90: \ utf-8 stuff for xchars
! 91:
! 92: : +u8/string ( c-addr1 u1 -- c-addr2 u2 )
! 93: over dup u8>> swap - /string ;
! 94:
! 95: : -u8/string ( c-addr1 u1 -- c-addr2 u2 )
! 96: over dup u8<< swap - /string ;
! 97:
! 98: : u8@ ( c-addr -- u )
! 99: u8@+ nip ;
! 100:
! 101: : u8!+? ( xc xc-addr1 u1 -- xc-addr2 u2 f )
! 102: >r over u8len r@ over u< if ( xc xc-addr1 len r: u1 )
! 103: \ not enough space
! 104: drop nip r> false
! 105: else
! 106: >r u8!+ r> r> swap - true
! 107: then ;
! 108:
! 109: : u8addrlen ( u8-addr -- u )
! 110: \ length of UTF-8 char starting at u8-addr (accesses only u8-addr)
! 111: c@
! 112: dup $80 u< if drop 1 exit endif
! 113: dup $c0 u< if UTF-8-err throw endif
! 114: dup $e0 u< if drop 2 exit endif
! 115: dup $f0 u< if drop 3 exit endif
! 116: dup $f8 u< if drop 4 exit endif
! 117: dup $fc u< if drop 5 exit endif
! 118: dup $fe u< if drop 6 exit endif
! 119: UTF-8-err throw ;
! 120:
! 121: : -u8trailing-garbage ( addr u1 -- addr u2 )
! 122: 2dup + dup u8<< ( addr u1 end1 end2 )
! 123: 2dup dup u8addrlen + = if \ last character ok
! 124: 2drop
! 125: else
! 126: nip nip over -
! 127: then ;
! 128:
! 129: : set-encoding-utf-8 ( -- )
! 130: ['] u8emit is xemit
! 131: ['] u8key is xkey
! 132: ['] u8>> is xchar+
! 133: ['] u8<< is xchar-
! 134: ['] +u8/string is +x/string
! 135: ['] -u8/string is -x/string
! 136: ['] u8@ is xc@
! 137: ['] u8!+? is xc!+?
! 138: ['] u8@+ is xc@+
! 139: ['] u8len is xc-size
! 140: ['] -u8trailing-garbage is -trailing-garbage
! 141: ;
1.1 pazsan 142:
143: \ input editor
144:
1.7 pazsan 145: [IFUNDEF] #esc 27 Constant #esc [THEN]
146:
147: : save-cursor ( -- ) #esc emit '7 emit ;
148: : restore-cursor ( -- ) #esc emit '8 emit ;
1.1 pazsan 149: : .rest ( addr pos1 -- addr pos1 )
150: restore-cursor 2dup type ;
151: : .all ( span addr pos1 -- span addr pos1 )
152: restore-cursor >r 2dup swap type r> ;
153:
1.3 pazsan 154: : <u8ins> ( max span addr pos1 u8char -- max span addr pos2 )
1.6 pazsan 155: >r 2over r@ u8len + u< IF rdrop bell EXIT THEN
156: >string over r@ u8len + swap move 2dup chars + r@ swap u8!+ drop
1.3 pazsan 157: r> u8len >r rot r@ chars + -rot r> chars + ;
1.1 pazsan 158: : (u8ins) ( max span addr pos1 u8char -- max span addr pos2 )
1.3 pazsan 159: <u8ins> .all .rest ;
1.1 pazsan 160: : u8back ( max span addr pos1 -- max span addr pos2 f )
1.2 pazsan 161: dup IF over + u8<< over - 0 max .all .rest
1.6 pazsan 162: ELSE bell THEN 0 ;
1.1 pazsan 163: : u8forw ( max span addr pos1 -- max span addr pos2 f )
1.6 pazsan 164: 2 pick over <> IF over + u8@+ u8emit over - ELSE bell THEN 0 ;
1.1 pazsan 165: : (u8del) ( max span addr pos1 -- max span addr pos2 )
166: over + dup u8<< tuck - >r over -
167: >string over r@ + -rot move
1.3 pazsan 168: rot r> - -rot ;
1.1 pazsan 169: : ?u8del ( max span addr pos1 -- max span addr pos2 0 )
1.3 pazsan 170: dup IF (u8del) .all 2 spaces .rest THEN 0 ;
1.1 pazsan 171: : <u8del> ( max span addr pos1 -- max span addr pos2 0 )
172: 2 pick over <>
1.3 pazsan 173: IF u8forw drop (u8del) .all 2 spaces .rest
1.6 pazsan 174: ELSE bell THEN 0 ;
1.1 pazsan 175: : u8eof 2 pick over or 0= IF bye ELSE <u8del> THEN ;
176:
1.3 pazsan 177: : u8first-pos ( max span addr pos1 -- max span addr 0 0 )
178: drop 0 .all .rest 0 ;
179: : u8end-pos ( max span addr pos1 -- max span addr span 0 )
180: drop over .all 0 ;
181:
182:
183: : u8clear-line ( max span addr pos1 -- max addr )
184: drop restore-cursor swap spaces restore-cursor ;
185: : u8clear-tib ( max span addr pos -- max 0 addr 0 false )
186: u8clear-line 0 tuck dup ;
187:
188: : (u8enter) ( max span addr pos1 -- max span addr pos2 true )
189: >r end^ 2@ hist-setpos
190: 2dup swap history write-line drop ( throw ) \ don't worry about errors
191: hist-pos 2dup backward^ 2! end^ 2!
192: r> .all space true ;
193:
194: : u8kill-expand ( max span addr pos1 -- max span addr pos2 )
195: prefix-found cell+ @ ?dup IF >r
196: r@ - >string over r@ + -rot move
197: rot r@ - -rot .all r> spaces .rest THEN ;
198:
199: : insert ( string length buffer size -- )
200: rot over min >r r@ - ( left over )
201: over dup r@ + rot move r> move ;
202:
203: : u8tab-expand ( max span addr pos1 -- max span addr pos2 0 )
204: key? IF #tab (u8ins) 0 EXIT THEN
205: u8kill-expand 2dup extract-word dup 0= IF nip EXIT THEN
1.5 pazsan 206: search-prefix tib-full?
207: IF 7 emit 2drop prefix-off
1.3 pazsan 208: ELSE dup >r
209: 2>r >string r@ + 2r> 2swap insert
210: r@ + rot r> + -rot
211: THEN
1.5 pazsan 212: prefix-found @ IF bl (u8ins) ELSE .all .rest THEN 0 ;
1.3 pazsan 213:
1.4 pazsan 214: : utf-8-io ( -- )
215: ['] u8forw ctrl F bindkey
216: ['] u8back ctrl B bindkey
217: ['] ?u8del ctrl H bindkey
218: ['] u8eof ctrl D bindkey
219: ['] <u8del> ctrl X bindkey
220: ['] u8clear-tib ctrl K bindkey
221: ['] u8first-pos ctrl A bindkey
222: ['] u8end-pos ctrl E bindkey
223: ['] (u8enter) #lf bindkey
224: ['] (u8enter) #cr bindkey
225: ['] u8tab-expand #tab bindkey
226: ['] (u8ins) IS insert-char
1.5 pazsan 227: ['] kill-prefix IS everychar
1.4 pazsan 228: ['] save-cursor IS everyline
229: ['] u8key IS key
230: ['] u8emit IS emit ;
231:
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