Annotation of gforth/extend.fs, revision 1.25

1.1       anton       1: \ EXTEND.FS    CORE-EXT Word not fully tested!         12may93jaw
                      2: 
1.12      anton       3: \ Copyright (C) 1995 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., 675 Mass Ave, Cambridge, MA 02139, USA.
                     20: 
                     21: 
1.1       anton      22: \ May be cross-compiled
                     23: 
                     24: decimal
                     25: 
                     26: \ .(                                                    12may93jaw
                     27: 
1.11      anton      28: : .(   ( compilation "...<paren>" -- ) \ core-ext dot-paren
1.8       anton      29:     [char] ) parse type ; immediate
1.1       anton      30: 
                     31: \ VALUE 2>R 2R> 2R@                                     17may93jaw
                     32: 
1.3       anton      33: \ !! 2value
1.1       anton      34: 
1.11      anton      35: : 2Literal ( compilation w1 w2 -- ; run-time  -- w1 w2 ) \ double two-literal
                     36:     swap postpone Literal  postpone Literal ; immediate restrict
1.2       pazsan     37: 
1.16      anton      38: ' drop alias d>s ( d -- n ) \ double           d_to_s
                     39: 
1.11      anton      40: : m*/ ( d1 n2 u3 -- dqout ) \ double m-star-slash
                     41:     >r s>d >r abs -rot
                     42:     s>d r> xor r> swap >r >r dabs rot tuck um* 2swap um*
                     43:     swap >r 0 d+ r> -rot r@ um/mod -rot r> um/mod nip swap
                     44:     r> IF dnegate THEN ;
1.4       pazsan     45: 
1.1       anton      46: \ CASE OF ENDOF ENDCASE                                 17may93jaw
                     47: 
                     48: \ just as described in dpANS5
                     49: 
1.11      anton      50: 0 CONSTANT case ( compilation  -- case-sys ; run-time  -- ) \ core-ext
                     51:     immediate
1.1       anton      52: 
1.11      anton      53: : of ( compilation  -- of-sys ; run-time x1 x2 -- |x1 ) \ core-ext
                     54:     \ !! the implementation does not match the stack effect
                     55:     1+ >r
                     56:     postpone over postpone = postpone if postpone drop
                     57:     r> ; immediate
                     58: 
                     59: : endof ( compilation case-sys1 of-sys -- case-sys2 ; run-time  -- ) \ core-ext end-of
                     60:     >r postpone else r> ; immediate
                     61: 
                     62: : endcase ( compilation case-sys -- ; run-time x -- ) \ core-ext end-case
                     63:     postpone drop
                     64:     0 ?do postpone then loop ; immediate
1.1       anton      65: 
                     66: \ C"                                                    17may93jaw
                     67: 
                     68: : (c")     "lit ;
                     69: 
1.11      anton      70: : CLiteral
                     71:     postpone (c") here over char+ allot  place align ; immediate restrict
                     72: 
                     73: : C" ( compilation "...<quote>" -- ; run-time  -- c-addr ) \ core-ext c-quote
                     74:     [char] " parse postpone CLiteral ; immediate restrict
1.1       anton      75: 
                     76: \ [COMPILE]                                             17may93jaw
                     77: 
1.11      anton      78: : [compile] ( compilation "name" -- ; run-time ? -- ? ) \ core-ext bracket-compile
1.24      pazsan     79:     comp' drop compile, ; immediate
1.1       anton      80: 
                     81: \ MARKER                                                17may93jaw
                     82: 
                     83: \ : marker here last @ create , , DOES> dup @ last ! cell+ @ dp ! ;
                     84: \ doesn't work now. vocabularies?
                     85: 
                     86: \ CONVERT                                               17may93jaw
                     87: 
1.11      anton      88: : convert ( ud1 c-addr1 -- ud2 c-addr2 ) \ core-ext
1.19      anton      89:     \ obsolescent; superseded by @code{>number}.
1.11      anton      90:     true >number drop ;
1.1       anton      91: 
                     92: \ ERASE                                                 17may93jaw
                     93: 
1.11      anton      94: : erase ( addr len -- ) \ core-ext
                     95:     \ !! dependence on "1 chars 1 ="
                     96:     ( 0 1 chars um/mod nip )  0 fill ;
                     97: : blank ( addr len -- ) \ string
                     98:     bl fill ;
1.1       anton      99: 
1.7       pazsan    100: \ SEARCH                                                02sep94py
                    101: 
1.11      anton     102: : search   ( buf buflen text textlen -- restbuf restlen flag ) \ string
                    103:     2over  2 pick - 1+ 3 pick c@ >r
                    104:     BEGIN
                    105:        r@ scan dup
                    106:     WHILE
                    107:        >r >r  2dup r@ -text
                    108:        0=
                    109:        IF
                    110:            >r drop 2drop r> r> r> rot + 1- rdrop true
                    111:            EXIT
                    112:        THEN
                    113:        r> r>  1 /string
                    114:     REPEAT
                    115:     2drop 2drop  rdrop false ;
1.7       pazsan    116: 
1.1       anton     117: \ SOURCE-ID SAVE-INPUT RESTORE-INPUT                    11jun93jaw
                    118: 
1.22      anton     119: : source-id ( -- 0 | -1 | fileid ) \ core-ext,file source-i-d
1.13      anton     120:   loadfile @ dup 0= IF  drop sourceline# 0 min  THEN ;
1.1       anton     121: 
1.11      anton     122: : save-input ( -- x1 .. xn n ) \ core-ext
1.14      anton     123:     >in @
                    124:     loadfile @
                    125:     if
                    126:        loadfile @ file-position throw
                    127:     else
                    128:        blk @
                    129:        linestart @
                    130:     then
                    131:     sourceline#
                    132:     >tib @
                    133:     source-id
                    134:     6 ;
1.1       anton     135: 
1.11      anton     136: : restore-input ( x1 .. xn n -- flag ) \ core-ext
1.14      anton     137:     6 <> -12 and throw
                    138:     source-id <> -12 and throw
                    139:     >tib !
                    140:     >r ( line# )
                    141:     loadfile @ 0<>
                    142:     if
                    143:        loadfile @ reposition-file throw
                    144:     else
                    145:        linestart !
                    146:        blk !
                    147:        sourceline# r@ <> blk @ 0= and loadfile @ 0= and
                    148:        if
                    149:            drop rdrop true EXIT
                    150:        then
                    151:     then
                    152:     r> loadline !
                    153:     >in !
                    154:     false ;
                    155: 
1.1       anton     156: \ This things we don't need, but for being complete... jaw
                    157: 
                    158: \ EXPECT SPAN                                           17may93jaw
                    159: 
1.11      anton     160: variable span ( -- a-addr ) \ core-ext
                    161: \ obsolescent
1.1       anton     162: 
1.11      anton     163: : expect ( c-addr +len -- ) \ core-ext
                    164:     \ obsolescent; use accept
1.9       anton     165:     0 rot over
                    166:     BEGIN ( maxlen span c-addr pos1 )
                    167:        key decode ( maxlen span c-addr pos2 flag )
                    168:        >r 2over = r> or
                    169:     UNTIL
1.17      pazsan    170:     2 pick swap /string type
                    171:     nip span ! ;
1.1       anton     172: 

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