Annotation of gforth/extend.fs, revision 1.32
1.1 anton 1: \ EXTEND.FS CORE-EXT Word not fully tested! 12may93jaw
2:
1.30 anton 3: \ Copyright (C) 1995,1998 Free Software Foundation, Inc.
1.12 anton 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:
1.32 ! crook 28: : .( ( "ccc<paren>" -- ) \ core-ext dot-paren
! 29: \G Parse a string ccc delimited by a ) (right parenthesis). Display
! 30: \G the string. This is often used to display progress information
! 31: \G during compilation. See examples below.
! 32: [char] ) parse type ; immediate
1.1 anton 33:
34: \ VALUE 2>R 2R> 2R@ 17may93jaw
35:
1.3 anton 36: \ !! 2value
1.1 anton 37:
1.11 anton 38: : 2Literal ( compilation w1 w2 -- ; run-time -- w1 w2 ) \ double two-literal
1.32 ! crook 39: \G Compile appropriate code such that, at run-time, cell pair w1, w2 are
! 40: \G placed on the stack. Interpretation semantics are undefined.
1.11 anton 41: swap postpone Literal postpone Literal ; immediate restrict
1.2 pazsan 42:
1.16 anton 43: ' drop alias d>s ( d -- n ) \ double d_to_s
44:
1.11 anton 45: : m*/ ( d1 n2 u3 -- dqout ) \ double m-star-slash
46: >r s>d >r abs -rot
47: s>d r> xor r> swap >r >r dabs rot tuck um* 2swap um*
48: swap >r 0 d+ r> -rot r@ um/mod -rot r> um/mod nip swap
49: r> IF dnegate THEN ;
1.4 pazsan 50:
1.1 anton 51: \ CASE OF ENDOF ENDCASE 17may93jaw
52:
53: \ just as described in dpANS5
54:
1.11 anton 55: 0 CONSTANT case ( compilation -- case-sys ; run-time -- ) \ core-ext
56: immediate
1.1 anton 57:
1.11 anton 58: : of ( compilation -- of-sys ; run-time x1 x2 -- |x1 ) \ core-ext
59: \ !! the implementation does not match the stack effect
60: 1+ >r
61: postpone over postpone = postpone if postpone drop
62: r> ; immediate
63:
64: : endof ( compilation case-sys1 of-sys -- case-sys2 ; run-time -- ) \ core-ext end-of
65: >r postpone else r> ; immediate
66:
67: : endcase ( compilation case-sys -- ; run-time x -- ) \ core-ext end-case
68: postpone drop
69: 0 ?do postpone then loop ; immediate
1.1 anton 70:
71: \ C" 17may93jaw
72:
73: : (c") "lit ;
74:
1.11 anton 75: : CLiteral
76: postpone (c") here over char+ allot place align ; immediate restrict
77:
1.32 ! crook 78: : C" ( compilation "ccc<quote>" -- ; run-time -- c-addr ) \ core-ext c-quote
! 79: \G Compilation: parse a string ccc delimited by a " (double quote). At
! 80: \G run-time, return c-addr which specifies the counted string ccc.
! 81: \G Interpretation semantics are undefined.
1.11 anton 82: [char] " parse postpone CLiteral ; immediate restrict
1.1 anton 83:
84: \ [COMPILE] 17may93jaw
85:
1.11 anton 86: : [compile] ( compilation "name" -- ; run-time ? -- ? ) \ core-ext bracket-compile
1.24 pazsan 87: comp' drop compile, ; immediate
1.1 anton 88:
89: \ CONVERT 17may93jaw
90:
1.11 anton 91: : convert ( ud1 c-addr1 -- ud2 c-addr2 ) \ core-ext
1.26 anton 92: \G obsolescent; superseded by @code{>number}.
93: char+ true >number drop ;
1.1 anton 94:
95: \ ERASE 17may93jaw
96:
1.11 anton 97: : erase ( addr len -- ) \ core-ext
1.32 ! crook 98: \G If len>0, clear all bits in each location of a memory region
! 99: \G of len address units starting at address addr.
1.11 anton 100: \ !! dependence on "1 chars 1 ="
101: ( 0 1 chars um/mod nip ) 0 fill ;
102: : blank ( addr len -- ) \ string
1.32 ! crook 103: \G If len>0, store the character value for a space in each
! 104: \G location of a memory region
! 105: \G of len character units starting at address addr.
1.11 anton 106: bl fill ;
1.1 anton 107:
1.7 pazsan 108: \ SEARCH 02sep94py
109:
1.28 anton 110: : search ( c-addr1 u1 c-addr2 u2 -- c-addr3 u3 flag ) \ string
1.32 ! crook 111: \G Search the string specified by c-addr1, u1 for the string
! 112: \G speficied by c-addr2, u2. If flag is true: match was found
! 113: \G at c-addr3 with u3 characters remaining. If flag is false:
! 114: \G no match was found; c-addr3, u3 are equal to c-addr1, u1.
1.28 anton 115: \ not very efficient; but if we want efficiency, we'll do it as primitive
116: 2>r 2dup
117: begin
118: dup r@ >=
119: while
120: over 2r@ swap -text 0= if
121: 2swap 2drop 2r> 2drop true exit
122: endif
123: 1 /string
124: repeat
125: 2drop 2r> 2drop false ;
1.7 pazsan 126:
1.1 anton 127: \ SOURCE-ID SAVE-INPUT RESTORE-INPUT 11jun93jaw
128:
1.22 anton 129: : source-id ( -- 0 | -1 | fileid ) \ core-ext,file source-i-d
1.13 anton 130: loadfile @ dup 0= IF drop sourceline# 0 min THEN ;
1.1 anton 131:
1.11 anton 132: : save-input ( -- x1 .. xn n ) \ core-ext
1.14 anton 133: >in @
134: loadfile @
135: if
136: loadfile @ file-position throw
137: else
138: blk @
139: linestart @
140: then
141: sourceline#
142: >tib @
143: source-id
144: 6 ;
1.1 anton 145:
1.11 anton 146: : restore-input ( x1 .. xn n -- flag ) \ core-ext
1.14 anton 147: 6 <> -12 and throw
148: source-id <> -12 and throw
149: >tib !
150: >r ( line# )
151: loadfile @ 0<>
152: if
153: loadfile @ reposition-file throw
154: else
155: linestart !
156: blk !
157: sourceline# r@ <> blk @ 0= and loadfile @ 0= and
158: if
159: drop rdrop true EXIT
160: then
161: then
162: r> loadline !
163: >in !
164: false ;
165:
1.1 anton 166: \ This things we don't need, but for being complete... jaw
167:
168: \ EXPECT SPAN 17may93jaw
169:
1.11 anton 170: variable span ( -- a-addr ) \ core-ext
171: \ obsolescent
1.1 anton 172:
1.11 anton 173: : expect ( c-addr +len -- ) \ core-ext
174: \ obsolescent; use accept
1.9 anton 175: 0 rot over
176: BEGIN ( maxlen span c-addr pos1 )
177: key decode ( maxlen span c-addr pos2 flag )
178: >r 2over = r> or
179: UNTIL
1.17 pazsan 180: 2 pick swap /string type
181: nip span ! ;
1.27 jwilke 182:
183: \ marker 18dec94py
184:
185: \ Marker creates a mark that is removed (including everything
186: \ defined afterwards) when executing the mark.
187:
1.31 anton 188: : included-files-mark ( -- u )
189: included-files 2@ nip
190: blk @ 0=
191: if \ not input from blocks
192: source-id 1 -1 within
193: if \ input from file
194: 1- \ do not include the last file (hopefully this is the
195: \ currently included file)
196: then
197: then ;
198:
199: \ hmm, most of the saving appears to be pretty unnecessary: we could
200: \ derive the wordlists and the words that have to be kept from the
201: \ saved value of dp value. - anton
202:
203: : marker, ( -- mark )
204: here
205: included-files-mark ,
206: dup A, \ here
207: voclink @ A, \ vocabulary list start
208: \ for all wordlists, remember wordlist-id (the linked list)
209: voclink
210: BEGIN
211: @ dup
212: WHILE
213: dup 0 wordlist-link - wordlist-id @ A,
214: REPEAT
215: drop
216: \ remember udp
217: udp @ , ;
1.27 jwilke 218:
219: : marker! ( mark -- )
1.31 anton 220: \ reset included files count; resize will happen on next add-included-file
221: included-files 2@ drop over @ included-files 2! cell+
222: \ rest of marker!
223: dup @ swap cell+ ( here rest-of-marker )
1.27 jwilke 224: dup @ voclink ! cell+
1.31 anton 225: \ restore wordlists to former words
1.27 jwilke 226: voclink
227: BEGIN
228: @ dup
229: WHILE
1.31 anton 230: over @ over 0 wordlist-link - wordlist-id !
1.27 jwilke 231: swap cell+ swap
232: REPEAT
1.31 anton 233: drop
234: \ rehash wordlists to remove forgotten words
235: \ why don't we do this in a single step? - anton
236: voclink
1.27 jwilke 237: BEGIN
238: @ dup
239: WHILE
240: dup 0 wordlist-link - rehash
241: REPEAT
242: drop
1.31 anton 243: \ restore udp and dp
1.29 pazsan 244: @ udp ! dp !
245: \ clean up vocabulary stack
246: 0 vp @ 0
247: ?DO
248: vp cell+ I cells + @ dup here >
249: IF drop ELSE swap 1+ THEN
250: LOOP
251: dup 0= or set-order \ -1 set-order if order is empty
252: get-current here > IF
253: forth-wordlist set-current
254: THEN ;
1.27 jwilke 255:
1.32 ! crook 256: : marker ( "<spaces> name" -- ) \ core-ext
! 257: \G Create a definition, @var{name} (called a @var{mark}) whose
! 258: \G execution semantics are to remove itself and everything
! 259: \G defined after it.
1.27 jwilke 260: marker, Create A,
261: DOES> ( -- )
262: @ marker! ;
1.1 anton 263:
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>