Annotation of gforth/extend.fs, revision 1.36
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
1.36 ! crook 29: \G Parse a string @i{ccc} delimited by a @code{)} (right
1.33 crook 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
1.36 ! crook 39: \G Compile appropriate code such that, at run-time, cell pair @i{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
1.36 ! crook 79: \G Compilation: parse a string @i{ccc} delimited by a @code{"}
! 80: \G (double quote). At run-time, return @i{c-addr} which
! 81: \G specifies the counted string @i{ccc}. Interpretation
1.33 crook 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
1.34 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
1.36 ! crook 99: \G If @i{len}>0, clear all bits in each location of a memory region
! 100: \G of @i{len} address units starting at address @i{addr}.
1.11 anton 101: \ !! dependence on "1 chars 1 ="
102: ( 0 1 chars um/mod nip ) 0 fill ;
1.34 crook 103: : blank ( c-addr u -- ) \ string
1.36 ! crook 104: \G If @i{u}>0, store the character value for a space in each
1.32 crook 105: \G location of a memory region
1.36 ! crook 106: \G of @i{u} character units starting at address @i{c-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
1.36 ! crook 112: \G Search the string specified by @i{c-addr1, u1} for the string
! 113: \G specified by @i{c-addr2, u2}. If @i{flag} is true: match was found
! 114: \G at @i{c-addr3} with @i{u3} characters remaining. If @i{flag} is false:
! 115: \G no match was found; @i{c-addr3, u3} are equal to @i{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
1.34 crook 131: \G Return 0 (the input source is the user input device), -1 (the
132: \G input source is a string being processed by @code{evaluate}) or
1.36 ! crook 133: \G a @i{fileid} (the input source is the file specified by
! 134: \G @i{fileid}).
1.34 crook 135: loadfile @ dup 0= IF drop sourceline# 0 min THEN ;
136:
137: : save-input ( -- xn .. x1 n ) \ core-ext
1.36 ! crook 138: \G The @i{n} entries @i{xn - x1} describe the current state of the
1.34 crook 139: \G input source specification, in some platform-dependent way that can
140: \G be used by @code{restore-input}.
1.14 anton 141: >in @
142: loadfile @
143: if
144: loadfile @ file-position throw
145: else
146: blk @
147: linestart @
148: then
149: sourceline#
150: >tib @
151: source-id
152: 6 ;
1.1 anton 153:
1.34 crook 154: : restore-input ( xn .. x1 n -- flag ) \ core-ext
155: \G Attempt to restore the input source specification to the state
1.36 ! crook 156: \G described by the @i{n} entries @i{xn - x1}. @i{flag} is
1.35 anton 157: \G true if the restore fails. In Gforth it fails pretty often
158: \G (and sometimes with a @code{throw}).
1.14 anton 159: 6 <> -12 and throw
160: source-id <> -12 and throw
161: >tib !
162: >r ( line# )
163: loadfile @ 0<>
164: if
165: loadfile @ reposition-file throw
166: else
167: linestart !
168: blk !
169: sourceline# r@ <> blk @ 0= and loadfile @ 0= and
170: if
171: drop rdrop true EXIT
172: then
173: then
174: r> loadline !
175: >in !
176: false ;
177:
1.1 anton 178: \ This things we don't need, but for being complete... jaw
179:
180: \ EXPECT SPAN 17may93jaw
181:
1.34 crook 182: variable span ( -- c-addr ) \ core-ext
1.36 ! crook 183: \G @code{Variable} -- @i{c-addr} is the address of a cell that stores the
! 184: \G length of the last string received by @code{expect}. OBSOLESCENT.
1.34 crook 185:
186: : expect ( c-addr +n -- ) \ core-ext
1.36 ! crook 187: \G Receive a string of at most @i{+n} characters, and store it
! 188: \G in memory starting at @i{c-addr}. The string is
1.34 crook 189: \G displayed. Input terminates when the <return> key is pressed or
1.36 ! crook 190: \G @i{+n} characters have been received. The normal Gforth line
1.34 crook 191: \G editing capabilites are available. The length of the string is
192: \G stored in @code{span}; it does not include the <return>
193: \G character. OBSOLESCENT: superceeded by @code{accept}.
1.9 anton 194: 0 rot over
195: BEGIN ( maxlen span c-addr pos1 )
196: key decode ( maxlen span c-addr pos2 flag )
197: >r 2over = r> or
198: UNTIL
1.17 pazsan 199: 2 pick swap /string type
200: nip span ! ;
1.27 jwilke 201:
202: \ marker 18dec94py
203:
204: \ Marker creates a mark that is removed (including everything
205: \ defined afterwards) when executing the mark.
206:
1.31 anton 207: : included-files-mark ( -- u )
208: included-files 2@ nip
209: blk @ 0=
210: if \ not input from blocks
211: source-id 1 -1 within
212: if \ input from file
213: 1- \ do not include the last file (hopefully this is the
214: \ currently included file)
215: then
216: then ;
217:
218: \ hmm, most of the saving appears to be pretty unnecessary: we could
219: \ derive the wordlists and the words that have to be kept from the
220: \ saved value of dp value. - anton
221:
222: : marker, ( -- mark )
223: here
224: included-files-mark ,
225: dup A, \ here
226: voclink @ A, \ vocabulary list start
227: \ for all wordlists, remember wordlist-id (the linked list)
228: voclink
229: BEGIN
230: @ dup
231: WHILE
232: dup 0 wordlist-link - wordlist-id @ A,
233: REPEAT
234: drop
235: \ remember udp
236: udp @ , ;
1.27 jwilke 237:
238: : marker! ( mark -- )
1.31 anton 239: \ reset included files count; resize will happen on next add-included-file
240: included-files 2@ drop over @ included-files 2! cell+
241: \ rest of marker!
242: dup @ swap cell+ ( here rest-of-marker )
1.27 jwilke 243: dup @ voclink ! cell+
1.31 anton 244: \ restore wordlists to former words
1.27 jwilke 245: voclink
246: BEGIN
247: @ dup
248: WHILE
1.31 anton 249: over @ over 0 wordlist-link - wordlist-id !
1.27 jwilke 250: swap cell+ swap
251: REPEAT
1.31 anton 252: drop
253: \ rehash wordlists to remove forgotten words
254: \ why don't we do this in a single step? - anton
255: voclink
1.27 jwilke 256: BEGIN
257: @ dup
258: WHILE
259: dup 0 wordlist-link - rehash
260: REPEAT
261: drop
1.31 anton 262: \ restore udp and dp
1.29 pazsan 263: @ udp ! dp !
264: \ clean up vocabulary stack
265: 0 vp @ 0
266: ?DO
267: vp cell+ I cells + @ dup here >
268: IF drop ELSE swap 1+ THEN
269: LOOP
270: dup 0= or set-order \ -1 set-order if order is empty
271: get-current here > IF
272: forth-wordlist set-current
273: THEN ;
1.27 jwilke 274:
1.32 crook 275: : marker ( "<spaces> name" -- ) \ core-ext
1.36 ! crook 276: \G Create a definition, @i{name} (called a @i{mark}) whose
1.32 crook 277: \G execution semantics are to remove itself and everything
278: \G defined after it.
1.27 jwilke 279: marker, Create A,
280: DOES> ( -- )
281: @ marker! ;
1.1 anton 282:
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