Annotation of gforth/extend.fs, revision 1.40
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:
1.39 anton 45: : m*/ ( d1 n2 u3 -- dquot ) \ double m-star-slash
1.40 ! anton 46: \G dquot=(d1*n2)/u3, with the intermediate result being triple-precision.
! 47: \G In ANS Forth u3 can only be a positive signed number.
1.11 anton 48: >r s>d >r abs -rot
49: s>d r> xor r> swap >r >r dabs rot tuck um* 2swap um*
50: swap >r 0 d+ r> -rot r@ um/mod -rot r> um/mod nip swap
51: r> IF dnegate THEN ;
1.4 pazsan 52:
1.1 anton 53: \ CASE OF ENDOF ENDCASE 17may93jaw
54:
55: \ just as described in dpANS5
56:
1.11 anton 57: 0 CONSTANT case ( compilation -- case-sys ; run-time -- ) \ core-ext
58: immediate
1.1 anton 59:
1.11 anton 60: : of ( compilation -- of-sys ; run-time x1 x2 -- |x1 ) \ core-ext
61: \ !! the implementation does not match the stack effect
62: 1+ >r
63: postpone over postpone = postpone if postpone drop
64: r> ; immediate
65:
66: : endof ( compilation case-sys1 of-sys -- case-sys2 ; run-time -- ) \ core-ext end-of
67: >r postpone else r> ; immediate
68:
69: : endcase ( compilation case-sys -- ; run-time x -- ) \ core-ext end-case
70: postpone drop
71: 0 ?do postpone then loop ; immediate
1.1 anton 72:
73: \ C" 17may93jaw
74:
75: : (c") "lit ;
76:
1.11 anton 77: : CLiteral
78: postpone (c") here over char+ allot place align ; immediate restrict
79:
1.32 crook 80: : C" ( compilation "ccc<quote>" -- ; run-time -- c-addr ) \ core-ext c-quote
1.36 crook 81: \G Compilation: parse a string @i{ccc} delimited by a @code{"}
82: \G (double quote). At run-time, return @i{c-addr} which
83: \G specifies the counted string @i{ccc}. Interpretation
1.33 crook 84: \G semantics are undefined.
1.11 anton 85: [char] " parse postpone CLiteral ; immediate restrict
1.1 anton 86:
87: \ [COMPILE] 17may93jaw
88:
1.11 anton 89: : [compile] ( compilation "name" -- ; run-time ? -- ? ) \ core-ext bracket-compile
1.37 anton 90: comp' drop
91: dup [ comp' exit drop ] literal = if
92: execute \ EXIT has default compilation semantics, perform them
93: else
94: compile,
95: then ; immediate
1.1 anton 96:
97: \ CONVERT 17may93jaw
98:
1.11 anton 99: : convert ( ud1 c-addr1 -- ud2 c-addr2 ) \ core-ext
1.34 crook 100: \G OBSOLESCENT: superseded by @code{>number}.
1.26 anton 101: char+ true >number drop ;
1.1 anton 102:
103: \ ERASE 17may93jaw
104:
1.40 ! anton 105: : erase ( addr u -- ) \ core-ext
! 106: \G Clear all bits in @i{u} aus starting at @i{addr}.
1.11 anton 107: \ !! dependence on "1 chars 1 ="
108: ( 0 1 chars um/mod nip ) 0 fill ;
1.34 crook 109: : blank ( c-addr u -- ) \ string
1.40 ! anton 110: \G Store the space character into @i{u} chars starting at @i{c-addr}.
1.11 anton 111: bl fill ;
1.1 anton 112:
1.7 pazsan 113: \ SEARCH 02sep94py
114:
1.28 anton 115: : search ( c-addr1 u1 c-addr2 u2 -- c-addr3 u3 flag ) \ string
1.36 crook 116: \G Search the string specified by @i{c-addr1, u1} for the string
117: \G specified by @i{c-addr2, u2}. If @i{flag} is true: match was found
118: \G at @i{c-addr3} with @i{u3} characters remaining. If @i{flag} is false:
119: \G no match was found; @i{c-addr3, u3} are equal to @i{c-addr1, u1}.
1.28 anton 120: \ not very efficient; but if we want efficiency, we'll do it as primitive
121: 2>r 2dup
122: begin
123: dup r@ >=
124: while
125: over 2r@ swap -text 0= if
126: 2swap 2drop 2r> 2drop true exit
127: endif
128: 1 /string
129: repeat
130: 2drop 2r> 2drop false ;
1.7 pazsan 131:
1.1 anton 132: \ SOURCE-ID SAVE-INPUT RESTORE-INPUT 11jun93jaw
133:
1.22 anton 134: : source-id ( -- 0 | -1 | fileid ) \ core-ext,file source-i-d
1.34 crook 135: \G Return 0 (the input source is the user input device), -1 (the
136: \G input source is a string being processed by @code{evaluate}) or
1.36 crook 137: \G a @i{fileid} (the input source is the file specified by
138: \G @i{fileid}).
1.34 crook 139: loadfile @ dup 0= IF drop sourceline# 0 min THEN ;
140:
141: : save-input ( -- xn .. x1 n ) \ core-ext
1.36 crook 142: \G The @i{n} entries @i{xn - x1} describe the current state of the
1.34 crook 143: \G input source specification, in some platform-dependent way that can
144: \G be used by @code{restore-input}.
1.14 anton 145: >in @
146: loadfile @
147: if
1.38 anton 148: loadfile @ file-position throw #TIB @ 1+ 0 d- \ !! bug for CRLF and EOF
1.14 anton 149: else
150: blk @
151: linestart @
152: then
153: sourceline#
154: >tib @
155: source-id
156: 6 ;
1.1 anton 157:
1.34 crook 158: : restore-input ( xn .. x1 n -- flag ) \ core-ext
159: \G Attempt to restore the input source specification to the state
1.36 crook 160: \G described by the @i{n} entries @i{xn - x1}. @i{flag} is
1.35 anton 161: \G true if the restore fails. In Gforth it fails pretty often
162: \G (and sometimes with a @code{throw}).
1.14 anton 163: 6 <> -12 and throw
164: source-id <> -12 and throw
165: >tib !
166: >r ( line# )
167: loadfile @ 0<>
168: if
169: loadfile @ reposition-file throw
1.38 anton 170: refill 0= -36 and throw \ should never throw
1.14 anton 171: else
172: linestart !
173: blk !
174: sourceline# r@ <> blk @ 0= and loadfile @ 0= and
175: if
176: drop rdrop true EXIT
177: then
178: then
179: r> loadline !
180: >in !
181: false ;
182:
1.1 anton 183: \ This things we don't need, but for being complete... jaw
184:
185: \ EXPECT SPAN 17may93jaw
186:
1.34 crook 187: variable span ( -- c-addr ) \ core-ext
1.36 crook 188: \G @code{Variable} -- @i{c-addr} is the address of a cell that stores the
189: \G length of the last string received by @code{expect}. OBSOLESCENT.
1.34 crook 190:
191: : expect ( c-addr +n -- ) \ core-ext
1.36 crook 192: \G Receive a string of at most @i{+n} characters, and store it
193: \G in memory starting at @i{c-addr}. The string is
1.34 crook 194: \G displayed. Input terminates when the <return> key is pressed or
1.36 crook 195: \G @i{+n} characters have been received. The normal Gforth line
1.34 crook 196: \G editing capabilites are available. The length of the string is
197: \G stored in @code{span}; it does not include the <return>
198: \G character. OBSOLESCENT: superceeded by @code{accept}.
1.9 anton 199: 0 rot over
200: BEGIN ( maxlen span c-addr pos1 )
201: key decode ( maxlen span c-addr pos2 flag )
202: >r 2over = r> or
203: UNTIL
1.17 pazsan 204: 2 pick swap /string type
205: nip span ! ;
1.27 jwilke 206:
207: \ marker 18dec94py
208:
209: \ Marker creates a mark that is removed (including everything
210: \ defined afterwards) when executing the mark.
211:
1.31 anton 212: : included-files-mark ( -- u )
213: included-files 2@ nip
214: blk @ 0=
215: if \ not input from blocks
216: source-id 1 -1 within
217: if \ input from file
218: 1- \ do not include the last file (hopefully this is the
219: \ currently included file)
220: then
221: then ;
222:
223: \ hmm, most of the saving appears to be pretty unnecessary: we could
224: \ derive the wordlists and the words that have to be kept from the
225: \ saved value of dp value. - anton
226:
227: : marker, ( -- mark )
228: here
229: included-files-mark ,
230: dup A, \ here
231: voclink @ A, \ vocabulary list start
232: \ for all wordlists, remember wordlist-id (the linked list)
233: voclink
234: BEGIN
235: @ dup
236: WHILE
237: dup 0 wordlist-link - wordlist-id @ A,
238: REPEAT
239: drop
240: \ remember udp
241: udp @ , ;
1.27 jwilke 242:
243: : marker! ( mark -- )
1.31 anton 244: \ reset included files count; resize will happen on next add-included-file
245: included-files 2@ drop over @ included-files 2! cell+
246: \ rest of marker!
247: dup @ swap cell+ ( here rest-of-marker )
1.27 jwilke 248: dup @ voclink ! cell+
1.31 anton 249: \ restore wordlists to former words
1.27 jwilke 250: voclink
251: BEGIN
252: @ dup
253: WHILE
1.31 anton 254: over @ over 0 wordlist-link - wordlist-id !
1.27 jwilke 255: swap cell+ swap
256: REPEAT
1.31 anton 257: drop
258: \ rehash wordlists to remove forgotten words
259: \ why don't we do this in a single step? - anton
260: voclink
1.27 jwilke 261: BEGIN
262: @ dup
263: WHILE
264: dup 0 wordlist-link - rehash
265: REPEAT
266: drop
1.31 anton 267: \ restore udp and dp
1.29 pazsan 268: @ udp ! dp !
269: \ clean up vocabulary stack
270: 0 vp @ 0
271: ?DO
272: vp cell+ I cells + @ dup here >
273: IF drop ELSE swap 1+ THEN
274: LOOP
275: dup 0= or set-order \ -1 set-order if order is empty
276: get-current here > IF
277: forth-wordlist set-current
278: THEN ;
1.27 jwilke 279:
1.32 crook 280: : marker ( "<spaces> name" -- ) \ core-ext
1.36 crook 281: \G Create a definition, @i{name} (called a @i{mark}) whose
1.32 crook 282: \G execution semantics are to remove itself and everything
283: \G defined after it.
1.27 jwilke 284: marker, Create A,
285: DOES> ( -- )
286: @ marker! ;
1.1 anton 287:
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