Annotation of gforth/extend.fs, revision 1.22
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: \ UNUSED 17may93jaw
77:
1.11 anton 78: : unused ( -- u ) \ core-ext
1.19 anton 79: forthstart dup 3 cells + @ + here - ;
1.1 anton 80:
81: \ [COMPILE] 17may93jaw
82:
1.11 anton 83: : [compile] ( compilation "name" -- ; run-time ? -- ? ) \ core-ext bracket-compile
84: ' compile, ; immediate
1.1 anton 85:
86: \ MARKER 17may93jaw
87:
88: \ : marker here last @ create , , DOES> dup @ last ! cell+ @ dp ! ;
89: \ doesn't work now. vocabularies?
90:
91: \ CONVERT 17may93jaw
92:
1.11 anton 93: : convert ( ud1 c-addr1 -- ud2 c-addr2 ) \ core-ext
1.19 anton 94: \ obsolescent; superseded by @code{>number}.
1.11 anton 95: true >number drop ;
1.1 anton 96:
97: \ ERASE 17may93jaw
98:
1.11 anton 99: : erase ( addr len -- ) \ core-ext
100: \ !! dependence on "1 chars 1 ="
101: ( 0 1 chars um/mod nip ) 0 fill ;
102: : blank ( addr len -- ) \ string
103: bl fill ;
1.1 anton 104:
1.7 pazsan 105: \ SEARCH 02sep94py
106:
1.11 anton 107: : search ( buf buflen text textlen -- restbuf restlen flag ) \ string
108: 2over 2 pick - 1+ 3 pick c@ >r
109: BEGIN
110: r@ scan dup
111: WHILE
112: >r >r 2dup r@ -text
113: 0=
114: IF
115: >r drop 2drop r> r> r> rot + 1- rdrop true
116: EXIT
117: THEN
118: r> r> 1 /string
119: REPEAT
120: 2drop 2drop rdrop false ;
1.7 pazsan 121:
1.1 anton 122: \ SOURCE-ID SAVE-INPUT RESTORE-INPUT 11jun93jaw
123:
1.22 ! anton 124: : source-id ( -- 0 | -1 | fileid ) \ core-ext,file source-i-d
1.13 anton 125: loadfile @ dup 0= IF drop sourceline# 0 min THEN ;
1.1 anton 126:
1.11 anton 127: : save-input ( -- x1 .. xn n ) \ core-ext
1.14 anton 128: >in @
129: loadfile @
130: if
131: loadfile @ file-position throw
132: else
133: blk @
134: linestart @
135: then
136: sourceline#
137: >tib @
138: source-id
139: 6 ;
1.1 anton 140:
1.11 anton 141: : restore-input ( x1 .. xn n -- flag ) \ core-ext
1.14 anton 142: 6 <> -12 and throw
143: source-id <> -12 and throw
144: >tib !
145: >r ( line# )
146: loadfile @ 0<>
147: if
148: loadfile @ reposition-file throw
149: else
150: linestart !
151: blk !
152: sourceline# r@ <> blk @ 0= and loadfile @ 0= and
153: if
154: drop rdrop true EXIT
155: then
156: then
157: r> loadline !
158: >in !
159: false ;
160:
1.1 anton 161: \ This things we don't need, but for being complete... jaw
162:
163: \ EXPECT SPAN 17may93jaw
164:
1.11 anton 165: variable span ( -- a-addr ) \ core-ext
166: \ obsolescent
1.1 anton 167:
1.11 anton 168: : expect ( c-addr +len -- ) \ core-ext
169: \ obsolescent; use accept
1.9 anton 170: 0 rot over
171: BEGIN ( maxlen span c-addr pos1 )
172: key decode ( maxlen span c-addr pos2 flag )
173: >r 2over = r> or
174: UNTIL
1.17 pazsan 175: 2 pick swap /string type
176: nip span ! ;
1.1 anton 177:
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