Annotation of gforth/kernel/xchars.fs, revision 1.8
1.1 anton 1: \ extended characters (either 8bit or UTF-8, possibly other encodings)
2: \ and their fixed-size variant
3:
1.5 anton 4: \ Copyright (C) 2005,2006 Free Software Foundation, Inc.
1.1 anton 5:
6: \ This file is part of Gforth.
7:
8: \ Gforth is free software; you can redistribute it and/or
9: \ modify it under the terms of the GNU General Public License
10: \ as published by the Free Software Foundation; either version 2
11: \ of the License, or (at your option) any later version.
12:
13: \ This program is distributed in the hope that it will be useful,
14: \ but WITHOUT ANY WARRANTY; without even the implied warranty of
15: \ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16: \ GNU General Public License for more details.
17:
18: \ You should have received a copy of the GNU General Public License
19: \ along with this program; if not, write to the Free Software
20: \ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
21:
22: \ We can do some of these (and possibly faster) by just using the
23: \ utf-8 words with an appropriate setting of max-single-byte, but I
24: \ like to see how an 8bit setting without UTF-8 stuff looks like.
25:
26: DEFER XEMIT ( xc -- )
27: DEFER XKEY ( -- xc )
28: DEFER XCHAR+ ( xc-addr1 -- xc-addr2 )
29: DEFER XCHAR- ( xc-addr1 -- xc-addr2 )
1.8 ! pazsan 30: DEFER +X/STRING ( xc-addr1 u1 -- xc-addr2 u2 )
! 31: DEFER X\STRING- ( xc-addr1 u1 -- xc-addr1 u2 )
1.1 anton 32: DEFER XC@ ( xc-addr -- xc )
33: DEFER XC!+? ( xc xc-addr1 u1 -- xc-addr2 u2 f ) \ f if operation succeeded
34: DEFER XC@+ ( xc-addr1 -- xc-addr2 xc )
35: DEFER XC-SIZE ( xc -- u ) \ size in cs
1.7 pazsan 36: DEFER X-SIZE ( xc-addr u1 -- u2 ) \ size in cs
1.4 pazsan 37: DEFER X-WIDTH ( addr u -- n ) \ size in fixed chars
1.1 anton 38: DEFER -TRAILING-GARBAGE ( addr u1 -- addr u2 ) \ remove trailing incomplete xc
39:
1.2 anton 40: \ derived words, faster implementations are probably possible
41:
1.6 pazsan 42: : x@+/string ( xc-addr1 u1 -- xc-addr2 u2 xc )
1.2 anton 43: \ !! check for errors?
1.8 ! pazsan 44: over >r +x/string
1.2 anton 45: r> xc@ ;
46:
1.1 anton 47: \ fixed-size versions of these words
48:
49: : char- ( c-addr1 -- c-addr2 )
50: [ 1 chars ] literal - ;
51:
1.6 pazsan 52: : +string ( c-addr1 u1 -- c-addr2 u2 )
1.1 anton 53: 1 /string ;
1.6 pazsan 54: : string- ( c-addr1 u1 -- c-addr1 u2 )
55: 1- ;
1.1 anton 56:
57: : c!+? ( c c-addr1 u1 -- c-addr2 u2 f )
1.3 anton 58: dup 1 chars u< if \ or use < ?
59: rot drop false
60: else
1.1 anton 61: >r dup >r c!
1.3 anton 62: r> r> 1 /string true
1.1 anton 63: then ;
64:
65: : c-size ( c -- 1 )
66: drop 1 ;
67:
68: : set-encoding-fixed-width ( -- )
69: ['] emit is xemit
70: ['] key is xkey
71: ['] char+ is xchar+
72: ['] char- is xchar-
1.8 ! pazsan 73: ['] +string is +x/string
! 74: ['] string- is x\string-
1.1 anton 75: ['] c@ is xc@
76: ['] c!+? is xc!+?
77: ['] count is xc@+
78: ['] c-size is xc-size
1.7 pazsan 79: ['] c-size is x-size
1.4 pazsan 80: ['] nip IS x-width
1.1 anton 81: ['] noop is -trailing-garbage
82: ;
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