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Annotation of gforth/xchars.fs, revision 1.1

1.1     ! anton       1: \ extended characters (either 8bit or UTF-8, possibly other encodings)
        !             2: \ and their fixed-size variant
        !             3: 
        !             4: \ Copyright (C) 2005 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 +X/STRING ( xc-addr1 u1 -- xc-addr2 u2 )
        !            31: DEFER -X/STRING ( xc-addr1 u1 -- xc-addr2 u2 )
        !            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
        !            36: DEFER -TRAILING-GARBAGE ( addr u1 -- addr u2 ) \ remove trailing incomplete xc
        !            37: 
        !            38: \ fixed-size versions of these words
        !            39: 
        !            40: : char- ( c-addr1 -- c-addr2 )
        !            41:     [ 1 chars ] literal - ;
        !            42: 
        !            43: : 1/string ( c-addr1 u1 -- c-addr2 u2 )
        !            44:     1 /string ;
        !            45: 
        !            46: : -1/string ( c-addr1 u1 -- c-addr2 u2 )
        !            47:     -1 /string ;
        !            48: 
        !            49: : c!+? ( c c-addr1 u1 -- c-addr2 u2 f )
        !            50:     1 chars u< if \ or use < ?
        !            51:        >r dup >r c!
        !            52:        1 r> r> /string true
        !            53:     else
        !            54:        rot drop false
        !            55:     then ;
        !            56: 
        !            57: : c-size ( c -- 1 )
        !            58:     drop 1 ;
        !            59: 
        !            60: : set-encoding-fixed-width ( -- )
        !            61:     ['] emit is xemit
        !            62:     ['] key is xkey
        !            63:     ['] char+ is xchar+
        !            64:     ['] char- is xchar-
        !            65:     ['] 1/string is +x/string
        !            66:     ['] -1/string is -x/string
        !            67:     ['] c@ is xc@
        !            68:     ['] c!+? is xc!+?
        !            69:     ['] count is xc@+
        !            70:     ['] c-size is xc-size
        !            71:     ['] noop is -trailing-garbage
        !            72: ;