Annotation of gforth/extend.fs, revision 1.33
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
1.33 ! crook 29: \G Parse a string @var{ccc} delimited by a @code{)} (right
! 30: \G parenthesis). Display the string. This is often used to display
! 31: \G progress information during compilation; see examples below.
1.32 crook 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
1.33 ! crook 39: \G Compile appropriate code such that, at run-time, cell pair @var{w1, w2} are
1.32 crook 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
1.33 ! crook 79: \G Compilation: parse a string @var{ccc} delimited by a @code{"}
! 80: \G (double quote). At run-time, return @var{c-addr} which
! 81: \G specifies the counted string @var{ccc}. Interpretation
! 82: \G semantics are undefined.
1.11 anton 83: [char] " parse postpone CLiteral ; immediate restrict
1.1 anton 84:
85: \ [COMPILE] 17may93jaw
86:
1.11 anton 87: : [compile] ( compilation "name" -- ; run-time ? -- ? ) \ core-ext bracket-compile
1.24 pazsan 88: comp' drop compile, ; immediate
1.1 anton 89:
90: \ CONVERT 17may93jaw
91:
1.11 anton 92: : convert ( ud1 c-addr1 -- ud2 c-addr2 ) \ core-ext
1.33 ! crook 93: \G OBSOLESCENT; superseded by @code{>number}.
1.26 anton 94: char+ true >number drop ;
1.1 anton 95:
96: \ ERASE 17may93jaw
97:
1.11 anton 98: : erase ( addr len -- ) \ core-ext
1.33 ! crook 99: \G If @var{len}>0, clear all bits in each location of a memory region
! 100: \G of @var{len} address units starting at address @var{addr}.
1.11 anton 101: \ !! dependence on "1 chars 1 ="
102: ( 0 1 chars um/mod nip ) 0 fill ;
103: : blank ( addr len -- ) \ string
1.33 ! crook 104: \G If @var{len}>0, store the character value for a space in each
1.32 crook 105: \G location of a memory region
1.33 ! crook 106: \G of @var{len} character units starting at address @var{addr}.
1.11 anton 107: bl fill ;
1.1 anton 108:
1.7 pazsan 109: \ SEARCH 02sep94py
110:
1.28 anton 111: : search ( c-addr1 u1 c-addr2 u2 -- c-addr3 u3 flag ) \ string
1.33 ! crook 112: \G Search the string specified by @var{c-addr1, u1} for the string
! 113: \G specified by @var{c-addr2, u2}. If @var{flag} is true: match was found
! 114: \G at @var{c-addr3} with @var{u3} characters remaining. If @var{flag} is false:
! 115: \G no match was found; @var{c-addr3, u3} are equal to @var{c-addr1, u1}.
1.28 anton 116: \ not very efficient; but if we want efficiency, we'll do it as primitive
117: 2>r 2dup
118: begin
119: dup r@ >=
120: while
121: over 2r@ swap -text 0= if
122: 2swap 2drop 2r> 2drop true exit
123: endif
124: 1 /string
125: repeat
126: 2drop 2r> 2drop false ;
1.7 pazsan 127:
1.1 anton 128: \ SOURCE-ID SAVE-INPUT RESTORE-INPUT 11jun93jaw
129:
1.22 anton 130: : source-id ( -- 0 | -1 | fileid ) \ core-ext,file source-i-d
1.13 anton 131: loadfile @ dup 0= IF drop sourceline# 0 min THEN ;
1.1 anton 132:
1.11 anton 133: : save-input ( -- x1 .. xn n ) \ core-ext
1.14 anton 134: >in @
135: loadfile @
136: if
137: loadfile @ file-position throw
138: else
139: blk @
140: linestart @
141: then
142: sourceline#
143: >tib @
144: source-id
145: 6 ;
1.1 anton 146:
1.11 anton 147: : restore-input ( x1 .. xn n -- flag ) \ core-ext
1.14 anton 148: 6 <> -12 and throw
149: source-id <> -12 and throw
150: >tib !
151: >r ( line# )
152: loadfile @ 0<>
153: if
154: loadfile @ reposition-file throw
155: else
156: linestart !
157: blk !
158: sourceline# r@ <> blk @ 0= and loadfile @ 0= and
159: if
160: drop rdrop true EXIT
161: then
162: then
163: r> loadline !
164: >in !
165: false ;
166:
1.1 anton 167: \ This things we don't need, but for being complete... jaw
168:
169: \ EXPECT SPAN 17may93jaw
170:
1.11 anton 171: variable span ( -- a-addr ) \ core-ext
172: \ obsolescent
1.1 anton 173:
1.11 anton 174: : expect ( c-addr +len -- ) \ core-ext
175: \ obsolescent; use accept
1.9 anton 176: 0 rot over
177: BEGIN ( maxlen span c-addr pos1 )
178: key decode ( maxlen span c-addr pos2 flag )
179: >r 2over = r> or
180: UNTIL
1.17 pazsan 181: 2 pick swap /string type
182: nip span ! ;
1.27 jwilke 183:
184: \ marker 18dec94py
185:
186: \ Marker creates a mark that is removed (including everything
187: \ defined afterwards) when executing the mark.
188:
1.31 anton 189: : included-files-mark ( -- u )
190: included-files 2@ nip
191: blk @ 0=
192: if \ not input from blocks
193: source-id 1 -1 within
194: if \ input from file
195: 1- \ do not include the last file (hopefully this is the
196: \ currently included file)
197: then
198: then ;
199:
200: \ hmm, most of the saving appears to be pretty unnecessary: we could
201: \ derive the wordlists and the words that have to be kept from the
202: \ saved value of dp value. - anton
203:
204: : marker, ( -- mark )
205: here
206: included-files-mark ,
207: dup A, \ here
208: voclink @ A, \ vocabulary list start
209: \ for all wordlists, remember wordlist-id (the linked list)
210: voclink
211: BEGIN
212: @ dup
213: WHILE
214: dup 0 wordlist-link - wordlist-id @ A,
215: REPEAT
216: drop
217: \ remember udp
218: udp @ , ;
1.27 jwilke 219:
220: : marker! ( mark -- )
1.31 anton 221: \ reset included files count; resize will happen on next add-included-file
222: included-files 2@ drop over @ included-files 2! cell+
223: \ rest of marker!
224: dup @ swap cell+ ( here rest-of-marker )
1.27 jwilke 225: dup @ voclink ! cell+
1.31 anton 226: \ restore wordlists to former words
1.27 jwilke 227: voclink
228: BEGIN
229: @ dup
230: WHILE
1.31 anton 231: over @ over 0 wordlist-link - wordlist-id !
1.27 jwilke 232: swap cell+ swap
233: REPEAT
1.31 anton 234: drop
235: \ rehash wordlists to remove forgotten words
236: \ why don't we do this in a single step? - anton
237: voclink
1.27 jwilke 238: BEGIN
239: @ dup
240: WHILE
241: dup 0 wordlist-link - rehash
242: REPEAT
243: drop
1.31 anton 244: \ restore udp and dp
1.29 pazsan 245: @ udp ! dp !
246: \ clean up vocabulary stack
247: 0 vp @ 0
248: ?DO
249: vp cell+ I cells + @ dup here >
250: IF drop ELSE swap 1+ THEN
251: LOOP
252: dup 0= or set-order \ -1 set-order if order is empty
253: get-current here > IF
254: forth-wordlist set-current
255: THEN ;
1.27 jwilke 256:
1.32 crook 257: : marker ( "<spaces> name" -- ) \ core-ext
258: \G Create a definition, @var{name} (called a @var{mark}) whose
259: \G execution semantics are to remove itself and everything
260: \G defined after it.
1.27 jwilke 261: marker, Create A,
262: DOES> ( -- )
263: @ marker! ;
1.1 anton 264:
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