Annotation of gforth/extend.fs, revision 1.39
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
1.11 anton 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
1.37 anton 88: comp' drop
89: dup [ comp' exit drop ] literal = if
90: execute \ EXIT has default compilation semantics, perform them
91: else
92: compile,
93: then ; immediate
1.1 anton 94:
95: \ CONVERT 17may93jaw
96:
1.11 anton 97: : convert ( ud1 c-addr1 -- ud2 c-addr2 ) \ core-ext
1.34 crook 98: \G OBSOLESCENT: superseded by @code{>number}.
1.26 anton 99: char+ true >number drop ;
1.1 anton 100:
101: \ ERASE 17may93jaw
102:
1.11 anton 103: : erase ( addr len -- ) \ core-ext
1.36 crook 104: \G If @i{len}>0, clear all bits in each location of a memory region
105: \G of @i{len} address units starting at address @i{addr}.
1.11 anton 106: \ !! dependence on "1 chars 1 ="
107: ( 0 1 chars um/mod nip ) 0 fill ;
1.34 crook 108: : blank ( c-addr u -- ) \ string
1.36 crook 109: \G If @i{u}>0, store the character value for a space in each
1.32 crook 110: \G location of a memory region
1.36 crook 111: \G of @i{u} character units starting at address @i{c-addr}.
1.11 anton 112: bl fill ;
1.1 anton 113:
1.7 pazsan 114: \ SEARCH 02sep94py
115:
1.28 anton 116: : search ( c-addr1 u1 c-addr2 u2 -- c-addr3 u3 flag ) \ string
1.36 crook 117: \G Search the string specified by @i{c-addr1, u1} for the string
118: \G specified by @i{c-addr2, u2}. If @i{flag} is true: match was found
119: \G at @i{c-addr3} with @i{u3} characters remaining. If @i{flag} is false:
120: \G no match was found; @i{c-addr3, u3} are equal to @i{c-addr1, u1}.
1.28 anton 121: \ not very efficient; but if we want efficiency, we'll do it as primitive
122: 2>r 2dup
123: begin
124: dup r@ >=
125: while
126: over 2r@ swap -text 0= if
127: 2swap 2drop 2r> 2drop true exit
128: endif
129: 1 /string
130: repeat
131: 2drop 2r> 2drop false ;
1.7 pazsan 132:
1.1 anton 133: \ SOURCE-ID SAVE-INPUT RESTORE-INPUT 11jun93jaw
134:
1.22 anton 135: : source-id ( -- 0 | -1 | fileid ) \ core-ext,file source-i-d
1.34 crook 136: \G Return 0 (the input source is the user input device), -1 (the
137: \G input source is a string being processed by @code{evaluate}) or
1.36 crook 138: \G a @i{fileid} (the input source is the file specified by
139: \G @i{fileid}).
1.34 crook 140: loadfile @ dup 0= IF drop sourceline# 0 min THEN ;
141:
142: : save-input ( -- xn .. x1 n ) \ core-ext
1.36 crook 143: \G The @i{n} entries @i{xn - x1} describe the current state of the
1.34 crook 144: \G input source specification, in some platform-dependent way that can
145: \G be used by @code{restore-input}.
1.14 anton 146: >in @
147: loadfile @
148: if
1.38 anton 149: loadfile @ file-position throw #TIB @ 1+ 0 d- \ !! bug for CRLF and EOF
1.14 anton 150: else
151: blk @
152: linestart @
153: then
154: sourceline#
155: >tib @
156: source-id
157: 6 ;
1.1 anton 158:
1.34 crook 159: : restore-input ( xn .. x1 n -- flag ) \ core-ext
160: \G Attempt to restore the input source specification to the state
1.36 crook 161: \G described by the @i{n} entries @i{xn - x1}. @i{flag} is
1.35 anton 162: \G true if the restore fails. In Gforth it fails pretty often
163: \G (and sometimes with a @code{throw}).
1.14 anton 164: 6 <> -12 and throw
165: source-id <> -12 and throw
166: >tib !
167: >r ( line# )
168: loadfile @ 0<>
169: if
170: loadfile @ reposition-file throw
1.38 anton 171: refill 0= -36 and throw \ should never throw
1.14 anton 172: else
173: linestart !
174: blk !
175: sourceline# r@ <> blk @ 0= and loadfile @ 0= and
176: if
177: drop rdrop true EXIT
178: then
179: then
180: r> loadline !
181: >in !
182: false ;
183:
1.1 anton 184: \ This things we don't need, but for being complete... jaw
185:
186: \ EXPECT SPAN 17may93jaw
187:
1.34 crook 188: variable span ( -- c-addr ) \ core-ext
1.36 crook 189: \G @code{Variable} -- @i{c-addr} is the address of a cell that stores the
190: \G length of the last string received by @code{expect}. OBSOLESCENT.
1.34 crook 191:
192: : expect ( c-addr +n -- ) \ core-ext
1.36 crook 193: \G Receive a string of at most @i{+n} characters, and store it
194: \G in memory starting at @i{c-addr}. The string is
1.34 crook 195: \G displayed. Input terminates when the <return> key is pressed or
1.36 crook 196: \G @i{+n} characters have been received. The normal Gforth line
1.34 crook 197: \G editing capabilites are available. The length of the string is
198: \G stored in @code{span}; it does not include the <return>
199: \G character. OBSOLESCENT: superceeded by @code{accept}.
1.9 anton 200: 0 rot over
201: BEGIN ( maxlen span c-addr pos1 )
202: key decode ( maxlen span c-addr pos2 flag )
203: >r 2over = r> or
204: UNTIL
1.17 pazsan 205: 2 pick swap /string type
206: nip span ! ;
1.27 jwilke 207:
208: \ marker 18dec94py
209:
210: \ Marker creates a mark that is removed (including everything
211: \ defined afterwards) when executing the mark.
212:
1.31 anton 213: : included-files-mark ( -- u )
214: included-files 2@ nip
215: blk @ 0=
216: if \ not input from blocks
217: source-id 1 -1 within
218: if \ input from file
219: 1- \ do not include the last file (hopefully this is the
220: \ currently included file)
221: then
222: then ;
223:
224: \ hmm, most of the saving appears to be pretty unnecessary: we could
225: \ derive the wordlists and the words that have to be kept from the
226: \ saved value of dp value. - anton
227:
228: : marker, ( -- mark )
229: here
230: included-files-mark ,
231: dup A, \ here
232: voclink @ A, \ vocabulary list start
233: \ for all wordlists, remember wordlist-id (the linked list)
234: voclink
235: BEGIN
236: @ dup
237: WHILE
238: dup 0 wordlist-link - wordlist-id @ A,
239: REPEAT
240: drop
241: \ remember udp
242: udp @ , ;
1.27 jwilke 243:
244: : marker! ( mark -- )
1.31 anton 245: \ reset included files count; resize will happen on next add-included-file
246: included-files 2@ drop over @ included-files 2! cell+
247: \ rest of marker!
248: dup @ swap cell+ ( here rest-of-marker )
1.27 jwilke 249: dup @ voclink ! cell+
1.31 anton 250: \ restore wordlists to former words
1.27 jwilke 251: voclink
252: BEGIN
253: @ dup
254: WHILE
1.31 anton 255: over @ over 0 wordlist-link - wordlist-id !
1.27 jwilke 256: swap cell+ swap
257: REPEAT
1.31 anton 258: drop
259: \ rehash wordlists to remove forgotten words
260: \ why don't we do this in a single step? - anton
261: voclink
1.27 jwilke 262: BEGIN
263: @ dup
264: WHILE
265: dup 0 wordlist-link - rehash
266: REPEAT
267: drop
1.31 anton 268: \ restore udp and dp
1.29 pazsan 269: @ udp ! dp !
270: \ clean up vocabulary stack
271: 0 vp @ 0
272: ?DO
273: vp cell+ I cells + @ dup here >
274: IF drop ELSE swap 1+ THEN
275: LOOP
276: dup 0= or set-order \ -1 set-order if order is empty
277: get-current here > IF
278: forth-wordlist set-current
279: THEN ;
1.27 jwilke 280:
1.32 crook 281: : marker ( "<spaces> name" -- ) \ core-ext
1.36 crook 282: \G Create a definition, @i{name} (called a @i{mark}) whose
1.32 crook 283: \G execution semantics are to remove itself and everything
284: \G defined after it.
1.27 jwilke 285: marker, Create A,
286: DOES> ( -- )
287: @ marker! ;
1.1 anton 288:
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