aboutsummaryrefslogtreecommitdiff
path: root/src/interp/scan.boot.pamphlet
blob: cd11767201ddc0908432101e9e8487e62e6fabd4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
\documentclass{article}
\usepackage{axiom}
\begin{document}
\title{\$SPAD/src/interp scan.boot}
\author{The Axiom Team}
\maketitle
\begin{abstract}
\end{abstract}
\eject
\tableofcontents
\eject
\section{License}
<<license>>=
-- Copyright (c) 1991-2002, The Numerical ALgorithms Group Ltd.
-- All rights reserved.
--
-- Redistribution and use in source and binary forms, with or without
-- modification, are permitted provided that the following conditions are
-- met:
--
--     - Redistributions of source code must retain the above copyright
--       notice, this list of conditions and the following disclaimer.
--
--     - Redistributions in binary form must reproduce the above copyright
--       notice, this list of conditions and the following disclaimer in
--       the documentation and/or other materials provided with the
--       distribution.
--
--     - Neither the name of The Numerical ALgorithms Group Ltd. nor the
--       names of its contributors may be used to endorse or promote products
--       derived from this software without specific prior written permission.
--
-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
-- IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
-- TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
-- PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
-- OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
-- EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
-- PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
-- PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
-- LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
-- NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-- SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

@
<<*>>=
<<license>>

)package "BOOT"

-- Scanner

--  lineoftoks  bites off a token-dq from a line-stream
--  returning the token-dq and the rest of the line-stream

scanIgnoreLine(ln,n)==
    if null n
    then n
    else
       fst:=QENUM(ln,0)
       if EQ(fst,CLOSEPAREN)
       then if incPrefix?('"command",1,ln)
            then true
            else nil
       else n

nextline(s)==
     if npNull s
     then false
     else
       $f:= CAR s
       $r:= CDR s
       $ln := CDR $f
       $linepos:=CAAR $f
       $n:=STRPOSL('" ",$ln,0,true)-- spaces at beginning
       $sz :=# $ln
       true


lineoftoks(s)==
   $f: local:=nil
   $r:local :=nil
   $ln:local :=nil
   $linepos:local:=nil
   $n:local:=nil
   $sz:local := nil
   $floatok:local:=true
   if not nextline s
   then CONS(nil,nil)
   else
     if null scanIgnoreLine($ln,$n) -- line of spaces or starts ) or >
     then cons(nil,$r)
     else
      toks:=[]
      a:= incPrefix?('"command",1,$ln)
      a =>
                 $ln:=SUBSTRING($ln,8,nil)
                 b:= dqUnit constoken($ln,$linepos,["command",$ln],0)
                 cons([[b,s]],$r)

      while $n<$sz repeat toks:=dqAppend(toks,scanToken())
      if null toks
      then cons([],$r)
      else cons([[toks,s]],$r)


scanToken () ==
      ln:=$ln
      c:=QENUM($ln,$n)
      linepos:=$linepos
      n:=$n
      ch:=$ln.$n
      b:=
            startsComment?()          =>
                           scanComment()
                           []
            startsNegComment?()       =>
                           scanNegComment()
                           []
            c= QUESTION               =>
                               $n:=$n+1
                               lfid '"?"
            punctuation? c            => scanPunct ()
            startsId? ch              => scanWord  (false)
            c=SPACE                   =>
                           scanSpace ()
                           []
            c = STRING_CHAR           => scanString ()
            digit? ch                 => scanNumber ()
            c=ESCAPE                  => scanEscape()
            scanError ()
      null b => nil
      dqUnit constoken(ln,linepos,b,n+lnExtraBlanks linepos)

-- to pair badge and badgee

-- lfid x== ["id",INTERN x]
lfid x== ["id",INTERN(x, '"BOOT")]

lfkey x==["key",keyword x]

lfinteger x==
           ["integer",x]
--     if EQUAL(x,'"0")
--     then ["id",INTERN x]
--     else if EQUAL(x,'"1")
--          then ["id",INTERN x]
--          else ["integer",x]

lfrinteger (r,x)==["integer",CONCAT (r,CONCAT('"r",x))]
--lfrfloat(a,w,v)==["rfloat",CONCAT(a,'"r.",v)]
lffloat(a,w,e)==["float",CONCAT(a,'".",w,'"e",e)]
lfstring x==if #x=1 then ["char",x] else ["string",x]
lfcomment x== ["comment", x]
lfnegcomment x== ["negcomment", x]
lferror x==["error",x]
lfspaces x==["spaces",x]

constoken(ln,lp,b,n)==
--  [b.0,b.1,cons(lp,n)]
       a:=cons(b.0,b.1)
       ncPutQ(a,"posn",cons(lp,n))
       a

scanEscape()==
         $n:=$n+1
         a:=scanEsc()
         if a then scanWord true else nil

scanEsc()==
     if $n>=$sz
     then if nextline($r)
          then
             while null $n repeat nextline($r)
             scanEsc()
             false
          else false
     else
           n1:=STRPOSL('" ",$ln,$n,true)
           if null n1
           then if nextline($r)
                then
                  while null $n repeat nextline($r)
                  scanEsc()
                  false
                else false
           else
                if $n=n1
                then true
                else if QENUM($ln,n1)=ESCAPE
                     then
                       $n:=n1+1
                       scanEsc()
                       false
                     else
                       $n:=n1
                       startsNegComment?() or startsComment?() =>
                                 nextline($r)
                                 scanEsc()
                                 false
                       false

startsComment?()==
    if $n<$sz
    then
         if QENUM($ln,$n)=PLUSCOMMENT
         then
            www:=$n+1
            if www>=$sz
            then false
            else QENUM($ln,www) = PLUSCOMMENT
          else false
    else false

startsNegComment?()==
    if $n< $sz
    then
         if QENUM($ln,$n)=MINUSCOMMENT
         then
            www:=$n+1
            if www>=$sz
            then false
            else QENUM($ln,www) = MINUSCOMMENT
          else false
    else false

scanNegComment()==
      n:=$n
      $n:=$sz
      lfnegcomment SUBSTRING($ln,n,nil)

scanComment()==
      n:=$n
      $n:=$sz
      lfcomment SUBSTRING($ln,n,nil)


scanPunct()==
            sss:=subMatch($ln,$n)
            a:= # sss
            if a=0
            then
               scanError()
            else
               $n:=$n+a
               scanKeyTr sss

scanKeyTr w==
       if EQ(keyword w,"DOT")
       then if $floatok
            then scanPossFloat(w)
            else lfkey w
       else
            $floatok:=not scanCloser? w
            lfkey w

scanPossFloat (w)==
     if $n>=$sz or not digit? $ln.$n
     then lfkey w
     else
       w:=spleI(function digit?)
       scanExponent('"0",w)

scanCloser:=[")","}","]","|)","|}","|]"]

scanCloser? w== MEMQ(keyword w,scanCloser)

scanSpace()==
           n:=$n
           $n:=STRPOSL('" ",$ln,$n,true)
           if null $n then $n:=# $ln
           $floatok:=true
           lfspaces ($n-n)

scanString()==
            $n:=$n+1
            $floatok:=false
            lfstring scanS ()

scanS()==
   if $n>=$sz
   then
     ncSoftError(cons($linepos,lnExtraBlanks $linepos+$n),"S2CN0001",[])
     '""
   else
           n:=$n
           strsym :=STRPOS ('"_"",$ln,$n,nil) or $sz
           escsym:=STRPOS ('"__"
                          ,$ln,$n,nil)  or $sz
           mn:=MIN(strsym,escsym)
           if mn=$sz
           then
                 $n:=$sz
                 ncSoftError(cons($linepos,lnExtraBlanks $linepos+$n),
                         "S2CN0001",[])
                 SUBSTRING($ln,n,nil)
           else if mn=strsym
                then
                   $n:=mn+1
                   SUBSTRING($ln,n,mn-n)
                else     --escape is found first
                  str:=SUBSTRING($ln,n,mn-n)-- before escape
                  $n:=mn+1
                  a:=scanEsc() -- case of end of line when false
                  b:=if a
                     then
                       str:=CONCAT(str,scanTransform($ln.$n))
                       $n:=$n+1
                       scanS()
                      else scanS()
                  CONCAT(str,b)
scanTransform x==x

--idChar? x== scanLetter x or DIGITP x or MEMQ(x,'(_? _%))

--scanLetter x==
--   if not CHARP x
--   then false
--   else STRPOSL(scanTrTable,x,0,NIL)

posend(line,n)==
     while n<#line and idChar? line.n repeat n:=n+1
     n

--numend(line,n)==
--     while n<#line and digit? line.n repeat n:=n+1
--     n

--startsId? x==  scanLetter x or MEMQ(x,'(_? _%))
digit? x== DIGITP x

scanW(b)==             -- starts pointing to first char
       n1:=$n         -- store starting character position
       $n:=$n+1          -- the first character is not tested
       l:=$sz
       endid:=posend($ln,$n)
       if endid=l or QENUM($ln,endid)^=ESCAPE
       then -- not escaped
           $n:=endid
           [b,SUBSTRING($ln,n1,endid-n1)]   -- l overflows
       else -- escape and endid^=l
           str:=SUBSTRING($ln,n1,endid-n1)
           $n:=endid+1
           a:=scanEsc()
           bb:=if a -- escape nonspace
               then scanW(true)
               else
                  if $n>=$sz
                  then [b,'""]
                  else
                    if idChar?($ln.$n)
                    then scanW(b)
                    else [b,'""]
           [bb.0 or b,CONCAT(str,bb.1)]

scanWord(esp) ==
          aaa:=scanW(false)
          w:=aaa.1
          $floatok:=false
          if esp or aaa.0
          then lfid w
          else if keyword? w
               then
                  $floatok:=true
                  lfkey w
               else lfid  w



spleI(dig)==spleI1(dig,false)
spleI1(dig,zro) ==
       n:=$n
       l:= $sz
       while $n<l and FUNCALL(dig,($ln.$n)) repeat $n:=$n+1
       if $n=l or QENUM($ln,$n)^=ESCAPE
       then if n=$n and zro
            then '"0"
            else SUBSTRING($ln,n,$n-n)
       else  -- escaped
             str:=SUBSTRING($ln,n,$n-n)
             $n:=$n+1
             a:=scanEsc()
             bb:=spleI1(dig,zro)-- escape, anyno spaces are ignored
             CONCAT(str,bb)

scanCheckRadix(r,w)==
       ns:=#w
       done:=false
       for i in 0..ns-1  repeat
         a:=rdigit? w.i
         if null a or a>=r
         then  ncSoftError(cons($linepos,lnExtraBlanks $linepos+$n-ns+i),
                    "S2CN0002", [w.i])

scanNumber() ==
       a := spleI(function digit?)
       if $n>=$sz
       then lfinteger a
       else
         if QENUM($ln,$n)^=RADIX_CHAR
         then
           if $floatok and QENUM($ln,$n)=DOT
           then
             n:=$n
             $n:=$n+1
             if  $n<$sz and QENUM($ln,$n)=DOT
             then
               $n:=n
               lfinteger a
             else
               w:=spleI1(function digit?,true)
               scanExponent(a,w)
           else lfinteger a
         else
             $n:=$n+1
             w:=spleI1(function rdigit?,true)
             scanCheckRadix(PARSE_-INTEGER a,w)
             if $n>=$sz
             then
                lfrinteger(a,w)
             else if QENUM($ln,$n)=DOT
                  then
                    n:=$n
                    $n:=$n+1
                    if  $n<$sz and QENUM($ln,$n)=DOT
                    then
                       $n:=n
                       lfrinteger(a,w)
                    else
                    --$n:=$n+1
                      v:=spleI1(function rdigit?,true)
                      scanCheckRadix(PARSE_-INTEGER a,v)
                      scanExponent(CONCAT(a,'"r",w),v)
                  else lfrinteger(a,w)

scanExponent(a,w)==
     if $n>=$sz
     then lffloat(a,w,'"0")
     else
        n:=$n
        c:=QENUM($ln,$n)
        if c=EXPONENT1 or c=EXPONENT2
        then
           $n:=$n+1
           if $n>=$sz
           then
             $n:=n
             lffloat(a,w,'"0")
           else if digit?($ln.$n)
                then
                  e:=spleI(function digit?)
                  lffloat(a,w,e)
                else
                  c1:=QENUM($ln,$n)
                  if c1=PLUSCOMMENT or c1=MINUSCOMMENT
                  then
                    $n:=$n+1
                    if $n>=$sz
                    then
                      $n:=n
                      lffloat(a,w,'"0")
                    else
                      if digit?($ln.$n)
                      then
                        e:=spleI(function digit?)
                        lffloat(a,w,
                          (if c1=MINUSCOMMENT then CONCAT('"-",e)else e))
                      else
                        $n:=n
                        lffloat(a,w,'"0")
        else lffloat(a,w,'"0")

rdigit? x==
   STRPOS(x,'"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ",0,nil)

scanError()==
      n:=$n
      $n:=$n+1
      ncSoftError(cons($linepos,lnExtraBlanks $linepos+$n),
         "S2CN0003",[$ln.n])
      lferror ($ln.n)


keyword st   == HGET(scanKeyTable,st)

keyword? st  ==  not null HGET(scanKeyTable,st)

scanInsert(s,d) ==
      l := #s
      h := QENUM(s,0)
      u := ELT(d,h)
      n := #u
      k:=0
      while l <= #(ELT(u,k)) repeat
          k:=k+1
      v := MAKE_-VEC(n+1)
      for i in 0..k-1 repeat VEC_-SETELT(v,i,ELT(u,i))
      VEC_-SETELT(v,k,s)
      for i in k..n-1 repeat VEC_-SETELT(v,i+1,ELT(u,i))
      VEC_-SETELT(d,h,v)
      s

subMatch(l,i)==substringMatch(l,scanDict,i)

substringMatch (l,d,i)==
       h:= QENUM(l, i)
       u:=ELT(d,h)
       ll:=SIZE l
       done:=false
       s1:='""
       for j in 0.. SIZE u - 1 while not done repeat
          s:=ELT(u,j)
          ls:=SIZE s
          done:=if ls+i > ll
                then false
                else
                 eql:= true
                 for k in 1..ls-1 while eql repeat
                    eql:= EQL(QENUM(s,k),QENUM(l,k+i))
                 if eql
                 then
                   s1:=s
                   true
                 else false
       s1


scanKeyTableCons()==
   KeyTable:=MAKE_-HASHTABLE("CVEC",true)
   for st in scanKeyWords repeat
      HPUT(KeyTable,CAR st,CADR st)
   KeyTable

scanDictCons()==
      l:= HKEYS scanKeyTable
      d :=
          a:=MAKE_-VEC(256)
          b:=MAKE_-VEC(1)
          VEC_-SETELT(b,0,MAKE_-CVEC 0)
          for i in 0..255 repeat VEC_-SETELT(a,i,b)
          a
      for s in l repeat scanInsert(s,d)
      d


scanPunCons()==
    listing := HKEYS scanKeyTable
    a:=MAKE_-BVEC 256
--  SETSIZE(a,256)
    for i in 0..255 repeat BVEC_-SETELT(a,i,0)
    for k in listing repeat
       if not startsId? k.0
       then BVEC_-SETELT(a,QENUM(k,0),1)
    a



punctuation? c== scanPun.c=1

@
\eject
\begin{thebibliography}{99}
\bibitem{1} nothing
\end{thebibliography}
\end{document}