1: \ extended characters (either 8bit or UTF-8, possibly other encodings)
2: \ and their fixed-size variant
3:
4: \ Copyright (C) 2005,2006 Free Software Foundation, Inc.
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 )
30: DEFER +XSTRING ( xc-addr1 u1 -- xc-addr2 u2 )
31: DEFER -XSTRING ( xc-addr1 u1 -- xc-addr2 u2 )
32: DEFER XSTRING+ ( xc-addr1 u1 -- xc-addr1 u2 )
33: DEFER XSTRING- ( xc-addr1 u1 -- xc-addr1 u2 )
34: DEFER XC@ ( xc-addr -- xc )
35: DEFER XC!+? ( xc xc-addr1 u1 -- xc-addr2 u2 f ) \ f if operation succeeded
36: DEFER XC@+ ( xc-addr1 -- xc-addr2 xc )
37: DEFER XC-SIZE ( xc -- u ) \ size in cs
38: DEFER X-WIDTH ( addr u -- n ) \ size in fixed chars
39: DEFER -TRAILING-GARBAGE ( addr u1 -- addr u2 ) \ remove trailing incomplete xc
40:
41: \ derived words, faster implementations are probably possible
42:
43: : x@+/string ( xc-addr1 u1 -- xc-addr2 u2 xc )
44: \ !! check for errors?
45: over >r +xstring
46: r> xc@ ;
47:
48: \ fixed-size versions of these words
49:
50: : char- ( c-addr1 -- c-addr2 )
51: [ 1 chars ] literal - ;
52:
53: : +string ( c-addr1 u1 -- c-addr2 u2 )
54: 1 /string ;
55: : -string ( c-addr1 u1 -- c-addr2 u2 )
56: -1 /string ;
57:
58: : string+ ( c-addr1 u1 -- c-addr1 u2 )
59: 1+ ;
60: : string- ( c-addr1 u1 -- c-addr1 u2 )
61: 1- ;
62:
63: : c!+? ( c c-addr1 u1 -- c-addr2 u2 f )
64: dup 1 chars u< if \ or use < ?
65: rot drop false
66: else
67: >r dup >r c!
68: r> r> 1 /string true
69: then ;
70:
71: : c-size ( c -- 1 )
72: drop 1 ;
73:
74: : set-encoding-fixed-width ( -- )
75: ['] emit is xemit
76: ['] key is xkey
77: ['] char+ is xchar+
78: ['] char- is xchar-
79: ['] +string is +xstring
80: ['] -string is -xstring
81: ['] string+ is xstring+
82: ['] string- is xstring-
83: ['] c@ is xc@
84: ['] c!+? is xc!+?
85: ['] count is xc@+
86: ['] c-size is xc-size
87: ['] nip IS x-width
88: ['] noop is -trailing-garbage
89: ;
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