Annotation of gforth/extend.fs, revision 1.70
1.1 anton 1: \ EXTEND.FS CORE-EXT Word not fully tested! 12may93jaw
2:
1.70 ! anton 3: \ Copyright (C) 1995,1998,2000,2003,2005,2007,2009,2010,2011 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
1.62 anton 9: \ as published by the Free Software Foundation, either version 3
1.12 anton 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
1.62 anton 18: \ along with this program. If not, see http://www.gnu.org/licenses/.
1.12 anton 19:
20:
1.1 anton 21: \ May be cross-compiled
22:
23: decimal
24:
25: \ .( 12may93jaw
26:
1.50 anton 27: : .( ( compilation&interpretation "ccc<paren>" -- ) \ core-ext dot-paren
1.41 anton 28: \G Compilation and interpretation semantics: Parse a string @i{ccc}
29: \G delimited by a @code{)} (right parenthesis). Display the
30: \G string. This is often used to display progress information during
31: \G 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:
1.56 anton 38: [ifundef] 2literal
1.11 anton 39: : 2Literal ( compilation w1 w2 -- ; run-time -- w1 w2 ) \ double two-literal
1.36 crook 40: \G Compile appropriate code such that, at run-time, cell pair @i{w1, w2} are
1.32 crook 41: \G placed on the stack. Interpretation semantics are undefined.
1.11 anton 42: swap postpone Literal postpone Literal ; immediate restrict
1.56 anton 43: [then]
1.2 pazsan 44:
1.16 anton 45: ' drop alias d>s ( d -- n ) \ double d_to_s
46:
1.39 anton 47: : m*/ ( d1 n2 u3 -- dquot ) \ double m-star-slash
1.40 anton 48: \G dquot=(d1*n2)/u3, with the intermediate result being triple-precision.
49: \G In ANS Forth u3 can only be a positive signed number.
1.11 anton 50: >r s>d >r abs -rot
51: s>d r> xor r> swap >r >r dabs rot tuck um* 2swap um*
1.59 anton 52: swap >r 0 d+ r> -rot r@ um/mod -rot r> um/mod
1.64 anton 53: [ 1 -3 mod 0< ] [if]
1.59 anton 54: -rot r> IF IF 1. d+ THEN dnegate ELSE drop THEN
55: [else]
56: nip swap r> IF dnegate THEN
57: [then] ;
1.4 pazsan 58:
1.1 anton 59: \ CASE OF ENDOF ENDCASE 17may93jaw
60:
61: \ just as described in dpANS5
62:
1.69 anton 63: [ifundef] cs-drop
64: : CS-DROP ( dest -- ) \ gforth
65: dest? 2drop ;
66: [then]
67:
68: : case ( compilation -- case-sys ; run-time -- ) \ core-ext
69: postpone begin 0 ; immediate
1.1 anton 70:
1.68 anton 71: : ?of ( compilation -- of-sys ; run-time f -- ) \ gforth
1.69 anton 72: >r POSTPONE if r> ; immediate
1.68 anton 73:
1.11 anton 74: : of ( compilation -- of-sys ; run-time x1 x2 -- |x1 ) \ core-ext
75: \ !! the implementation does not match the stack effect
1.68 anton 76: postpone over postpone = postpone ?of postpone drop ; immediate
1.11 anton 77:
78: : endof ( compilation case-sys1 of-sys -- case-sys2 ; run-time -- ) \ core-ext end-of
1.69 anton 79: >r postpone else 1 cs-roll r> 1+ ; immediate
80:
81: : contof ( compilation case-sys1 of-sys -- case-sys2 ; run-time -- )
82: \ like @code{endof}, but loops back to the @code{case}
83: >r 1 cs-pick postpone again postpone then r> ; immediate
84:
85: : n-thens ( orig1 ... origu u -- )
86: 0 ?do postpone then loop ;
1.11 anton 87:
88: : endcase ( compilation case-sys -- ; run-time x -- ) \ core-ext end-case
1.69 anton 89: >r cs-drop postpone drop r> n-thens ; immediate
90:
91: : nextcase ( compilation case-sys -- ; run-time x -- ) \ gforth-undocumented
92: \ like ENDCASE, but start again from the beginning if this is
93: \ reached by fallthrough
94: >r postpone drop postpone again r> n-thens ; immediate
95:
1.1 anton 96:
97: \ C" 17may93jaw
98:
1.32 crook 99: : C" ( compilation "ccc<quote>" -- ; run-time -- c-addr ) \ core-ext c-quote
1.36 crook 100: \G Compilation: parse a string @i{ccc} delimited by a @code{"}
101: \G (double quote). At run-time, return @i{c-addr} which
102: \G specifies the counted string @i{ccc}. Interpretation
1.33 crook 103: \G semantics are undefined.
1.11 anton 104: [char] " parse postpone CLiteral ; immediate restrict
1.1 anton 105:
106: \ [COMPILE] 17may93jaw
107:
1.11 anton 108: : [compile] ( compilation "name" -- ; run-time ? -- ? ) \ core-ext bracket-compile
1.37 anton 109: comp' drop
110: dup [ comp' exit drop ] literal = if
111: execute \ EXIT has default compilation semantics, perform them
112: else
113: compile,
114: then ; immediate
1.1 anton 115:
116: \ CONVERT 17may93jaw
117:
1.60 anton 118: : convert ( ud1 c-addr1 -- ud2 c-addr2 ) \ core-ext-obsolescent
119: \G Obsolescent: superseded by @code{>number}.
1.26 anton 120: char+ true >number drop ;
1.1 anton 121:
122: \ ERASE 17may93jaw
123:
1.40 anton 124: : erase ( addr u -- ) \ core-ext
125: \G Clear all bits in @i{u} aus starting at @i{addr}.
1.11 anton 126: \ !! dependence on "1 chars 1 ="
127: ( 0 1 chars um/mod nip ) 0 fill ;
1.34 crook 128: : blank ( c-addr u -- ) \ string
1.40 anton 129: \G Store the space character into @i{u} chars starting at @i{c-addr}.
1.11 anton 130: bl fill ;
1.1 anton 131:
1.7 pazsan 132: \ SEARCH 02sep94py
133:
1.28 anton 134: : search ( c-addr1 u1 c-addr2 u2 -- c-addr3 u3 flag ) \ string
1.36 crook 135: \G Search the string specified by @i{c-addr1, u1} for the string
136: \G specified by @i{c-addr2, u2}. If @i{flag} is true: match was found
137: \G at @i{c-addr3} with @i{u3} characters remaining. If @i{flag} is false:
138: \G no match was found; @i{c-addr3, u3} are equal to @i{c-addr1, u1}.
1.28 anton 139: \ not very efficient; but if we want efficiency, we'll do it as primitive
140: 2>r 2dup
141: begin
142: dup r@ >=
143: while
1.53 anton 144: 2dup 2r@ string-prefix? if
1.28 anton 145: 2swap 2drop 2r> 2drop true exit
146: endif
147: 1 /string
148: repeat
149: 2drop 2r> 2drop false ;
1.7 pazsan 150:
1.1 anton 151: \ SOURCE-ID SAVE-INPUT RESTORE-INPUT 11jun93jaw
152:
1.46 pazsan 153: [IFUNDEF] source-id
1.22 anton 154: : source-id ( -- 0 | -1 | fileid ) \ core-ext,file source-i-d
1.34 crook 155: \G Return 0 (the input source is the user input device), -1 (the
156: \G input source is a string being processed by @code{evaluate}) or
1.36 crook 157: \G a @i{fileid} (the input source is the file specified by
158: \G @i{fileid}).
1.34 crook 159: loadfile @ dup 0= IF drop sourceline# 0 min THEN ;
160:
161: : save-input ( -- xn .. x1 n ) \ core-ext
1.36 crook 162: \G The @i{n} entries @i{xn - x1} describe the current state of the
1.34 crook 163: \G input source specification, in some platform-dependent way that can
164: \G be used by @code{restore-input}.
1.14 anton 165: >in @
166: loadfile @
167: if
1.43 pazsan 168: loadfile @ file-position throw
169: [IFDEF] #fill-bytes #fill-bytes @ [ELSE] #tib @ 1+ [THEN] 0 d-
1.14 anton 170: else
171: blk @
172: linestart @
173: then
174: sourceline#
175: >tib @
176: source-id
177: 6 ;
1.1 anton 178:
1.34 crook 179: : restore-input ( xn .. x1 n -- flag ) \ core-ext
180: \G Attempt to restore the input source specification to the state
1.36 crook 181: \G described by the @i{n} entries @i{xn - x1}. @i{flag} is
1.35 anton 182: \G true if the restore fails. In Gforth it fails pretty often
183: \G (and sometimes with a @code{throw}).
1.14 anton 184: 6 <> -12 and throw
185: source-id <> -12 and throw
186: >tib !
187: >r ( line# )
188: loadfile @ 0<>
189: if
190: loadfile @ reposition-file throw
1.38 anton 191: refill 0= -36 and throw \ should never throw
1.14 anton 192: else
193: linestart !
194: blk !
195: sourceline# r@ <> blk @ 0= and loadfile @ 0= and
196: if
197: drop rdrop true EXIT
198: then
199: then
200: r> loadline !
201: >in !
202: false ;
1.46 pazsan 203: [THEN]
1.1 anton 204: \ This things we don't need, but for being complete... jaw
205:
206: \ EXPECT SPAN 17may93jaw
207:
1.60 anton 208: variable span ( -- c-addr ) \ core-ext-obsolescent
1.36 crook 209: \G @code{Variable} -- @i{c-addr} is the address of a cell that stores the
210: \G length of the last string received by @code{expect}. OBSOLESCENT.
1.34 crook 211:
1.60 anton 212: : expect ( c-addr +n -- ) \ core-ext-obsolescent
1.36 crook 213: \G Receive a string of at most @i{+n} characters, and store it
214: \G in memory starting at @i{c-addr}. The string is
1.34 crook 215: \G displayed. Input terminates when the <return> key is pressed or
1.36 crook 216: \G @i{+n} characters have been received. The normal Gforth line
1.34 crook 217: \G editing capabilites are available. The length of the string is
218: \G stored in @code{span}; it does not include the <return>
219: \G character. OBSOLESCENT: superceeded by @code{accept}.
1.66 pazsan 220: everyline
1.9 anton 221: 0 rot over
222: BEGIN ( maxlen span c-addr pos1 )
1.66 pazsan 223: xkey decode ( maxlen span c-addr pos2 flag )
1.9 anton 224: >r 2over = r> or
225: UNTIL
1.17 pazsan 226: 2 pick swap /string type
227: nip span ! ;
1.27 jwilke 228:
229: \ marker 18dec94py
230:
231: \ Marker creates a mark that is removed (including everything
232: \ defined afterwards) when executing the mark.
233:
1.31 anton 234: : included-files-mark ( -- u )
1.63 pazsan 235: included-files @ ;
1.31 anton 236:
237: \ hmm, most of the saving appears to be pretty unnecessary: we could
238: \ derive the wordlists and the words that have to be kept from the
239: \ saved value of dp value. - anton
240:
241: : marker, ( -- mark )
242: here
243: included-files-mark ,
244: dup A, \ here
245: voclink @ A, \ vocabulary list start
246: \ for all wordlists, remember wordlist-id (the linked list)
247: voclink
248: BEGIN
249: @ dup
250: WHILE
251: dup 0 wordlist-link - wordlist-id @ A,
252: REPEAT
253: drop
254: \ remember udp
1.48 anton 255: udp @ ,
256: \ remember dyncode-ptr
257: here ['] noop , compile-prim1 finish-code ;
1.27 jwilke 258:
259: : marker! ( mark -- )
1.31 anton 260: \ reset included files count; resize will happen on next add-included-file
1.63 pazsan 261: included-files @ over @ min included-files ! cell+
1.31 anton 262: \ rest of marker!
263: dup @ swap cell+ ( here rest-of-marker )
1.27 jwilke 264: dup @ voclink ! cell+
1.31 anton 265: \ restore wordlists to former words
1.27 jwilke 266: voclink
267: BEGIN
268: @ dup
269: WHILE
1.31 anton 270: over @ over 0 wordlist-link - wordlist-id !
1.27 jwilke 271: swap cell+ swap
272: REPEAT
1.31 anton 273: drop
274: \ rehash wordlists to remove forgotten words
275: \ why don't we do this in a single step? - anton
276: voclink
1.27 jwilke 277: BEGIN
278: @ dup
279: WHILE
280: dup 0 wordlist-link - rehash
281: REPEAT
282: drop
1.31 anton 283: \ restore udp and dp
1.49 pazsan 284: [IFDEF] forget-dyncode
1.54 anton 285: dup cell+ @ forget-dyncode drop
1.49 pazsan 286: [THEN]
1.29 pazsan 287: @ udp ! dp !
288: \ clean up vocabulary stack
289: 0 vp @ 0
290: ?DO
291: vp cell+ I cells + @ dup here >
292: IF drop ELSE swap 1+ THEN
293: LOOP
294: dup 0= or set-order \ -1 set-order if order is empty
295: get-current here > IF
296: forth-wordlist set-current
297: THEN ;
1.27 jwilke 298:
1.32 crook 299: : marker ( "<spaces> name" -- ) \ core-ext
1.36 crook 300: \G Create a definition, @i{name} (called a @i{mark}) whose
1.32 crook 301: \G execution semantics are to remove itself and everything
302: \G defined after it.
1.27 jwilke 303: marker, Create A,
304: DOES> ( -- )
305: @ marker! ;
1.1 anton 306:
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