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|
subroutine parse
c ====================================================================
c Scilab parsing function
c ====================================================================
c Copyright INRIA
include '../stack.h'
parameter (nz1=nsiz-1,nz2=nsiz-2)
logical compil,eptover
c
logical iflag
common /basbrk/ iflag
integer semi,equal,eol,lparen,rparen,colon,dot
integer blank,comma,left,right,less,great,not
integer quote,percen
integer name,num,insert,extrac
c
integer id(nsiz),ans(nsiz)
integer pts,psym,excnt,p,r,topk
integer pcount,strcnt,bcount,qcount,pchar
c
integer otimer,ntimer,stimer,ismenu
external stimer,ismenu
save otimer
data otimer/0/
c
data blank/40/,semi/43/,equal/50/,eol/99/,comma/52/,colon/44/
data lparen/41/,rparen/42/,left/54/,right/55/,less/59/,great/60/
data not/61/
data quote/53/,percen/56/,dot/51/
data name/1/,num/0/,insert/2/,extrac/3/
data ans/672929546,nz1*673720360/
c
save job
c
call xscion(inxsci)
01 r = 0
if(pt.gt.0) r=rstk(pt)
if(ddt.eq.4) then
write(buf(1:18),'(2i4,2i2,i6)') pt,r,icall,niv,err
call basout(io,wte,' TOP pt:'//buf(1:4)//' rstk(pt):'
+ //buf(5:8)//' icall:'//buf(9:10)//' niv:'//buf(11:12)
+ //' err:'//buf(13:18))
endif
c
if(icall.eq.5) goto 88
if(pt.gt.0) goto 86
if(err.gt.0) goto 98
c initialization
c-------------------
05 sym = eol
job=0
if(rio.eq.-1) job=-1
top = 0
fin=0
macr=0
paus=0
icall=0
rio = rte
lct(3) = 0
lct(4) = 2
lpt(1) = 1
if(job.eq.-1) goto 13
c
10 if(sym.ne.eol) goto 15
if(comp(1).eq.0) goto 12
if(lin(lpt(4)+1).eq.eol) goto 88
c
c get a new line
c-------------------
12 continue
if(lct(4).le.-10) then
lct(4)=-lct(4)-11
else
if (mod(lct(4)/2,2).eq.1) then
call prompt(lct(4)/4)
lct(1)=0
if(paus.eq.0.and.rio.eq.rte) then
if(pt.ne.0) then
call msgs(30,0)
pt=0
endif
if(top.ne.0) then
call msgs(31,0)
top=0
endif
endif
endif
endif
13 continue
call getlin(job)
if(fin .eq. -1) then
c Continuation line handling when scilab is called as a routine
fun=99
return
endif
job=0
err = 0
c
c Beginning of a new statement, clause expression or command
c------------------------------------------------------------
15 continue
if (inxsci.eq.1) then
ntimer=stimer()
if (ntimer.ne.otimer) then
call sxevents()
otimer=ntimer
if(ismenu().eq.1) goto 96
endif
endif
r = 0
if(pt.gt.0) r=rstk(pt)
if(ddt.eq.4) then
write(buf(1:20),'(3i4,i2,i6)') pt,r,top,niv,err
call basout(io,wte,' parse pt:'//buf(1:4)//' rstk(pt):'
+ //buf(5:8)//' top:'//buf(9:12)//' niv:'//buf(13:14)
+ //' err:'//buf(15:20))
endif
c
excnt = 0
if(.not.iflag) goto 18
c Handling of pauses
16 if ( eptover(1,psiz)) goto 98
pstk(pt)=rio
ids(2,pt)=top
rio=rte
rstk(pt)=701
iflag=.false.
fin=2
if(lct(4).le.-10) then
fin=-1
lct(4)=-lct(4)-11
endif
c *call* macro
goto 88
c pauses termination
17 rio=pstk(pt)
top=ids(2,pt)
pt=pt-1
goto 15
18 lhs = 1
call putid(id,ans)
c
call getsym
if (sym.eq.right) call getsym
if (sym.eq.colon) call getsym
if (sym.eq.semi .or. sym.eq.comma .or. sym.eq.eol) goto 75
if (sym.eq.name) goto 20
if (sym.eq.left) goto 40
goto 60
c
c lhs begins with name
c-------------------------
20 call comand(syn)
if (err .gt. 0) goto 98
if (fun .eq. 99) return
if (fun .ne. 0) goto 93
if (fin .lt. 0) goto 80
if (fin .eq. 2) goto 88
if (fin .eq. 3) goto 16
if (fin .eq. 4) goto 05
if (fin .gt. 0) goto 75
21 rhs = 0
c fin=0
c call funtab(syn,fin,1)
fin=-5
c IL y a p avec fin=-5 (on ne trouve pas les macros parce que l'on ne
c veut pas que les macros sans arg soient vues comme des commandes
c mais pourquoi pas il suffirait de dire que pour visualiser une macro
c il faut faire disp()
fun=0
call funs(syn)
if (fin .gt. 0) then
c name est le nom d'une primitive
if(char1.eq.equal) then
call putid(ids(1,pt+1),syn)
call error(25)
goto 98
endif
c name is a function, must be rhs
goto 60
endif
c
c peek one character ahead
if (char1.eq.semi .or. char1.eq.comma .or. char1.eq.eol)
$ call putid(id,syn)
if (char1 .eq. equal) goto 25
if (char1 .eq. lparen) goto 30
goto 60
c
c lhs is simple variable
c---------------------------
25 call putid(id,syn)
lpts=lpt(2)
call getsym
if(char1.eq.equal) then
c logical equality
lpt(4)=lpts
lpt(2)=lpts
lpt(3)=lpts
call putid(id,ans)
char1=blank
sym=blank
endif
call getsym
goto 60
c
c lhs is name(...)
c---------------------
30 lpt(5) = lpt(4)
call putid(id,syn)
c
c looking for equal
pcount=0
strcnt=0
bcount=0
31 psym=sym
call getsym
if(strcnt.ne.0) then
if(sym.eq.eol) then
call error(3)
goto 98
endif
if(sym.eq.quote) then
qcount=0
311 qcount=qcount+1
if(abs(char1).ne.quote) goto 312
call getsym
goto 311
312 continue
if(2*int(qcount/2).ne.qcount) strcnt=0
endif
else if(sym.eq.lparen) then
pcount=pcount+1
else if(sym.eq.rparen) then
pcount=pcount-1
if(pcount.lt.0) then
call error(2)
goto 98
endif
else if(sym.eq.quote) then
c . check if transpose or beginning of a string
pchar=lin(lpt(3)-2)
if(abs(pchar).eq.blank) then
strcnt=1
elseif(psym.ne.num.and.psym.ne.name.and.psym.ne.rparen.and.
$ psym.ne.right.and.psym.ne.dot.and.psym.ne.quote) then
strcnt=1
endif
c if(psym.ne.num.and.psym.ne.name.and.psym.ne.rparen.and.
c $ psym.ne.right.and.psym.ne.dot.and.psym.ne.quote)
c $ strcnt=1
c if (bcount.ne.0) then
c pchar=lin(lpt(3)-2)
c if(abs(pchar).eq.blank) strcnt=1
c endif
else if(sym.eq.left) then
bcount=bcount+1
else if(sym.eq.right) then
bcount=bcount-1
if(bcount.lt.0) then
call error(2)
goto 98
endif
else if(pcount.eq.0) then
c if(bcount.ne.0) then
c call error(2)
c goto 98
c endif
if(sym.eq.equal) then
if(char1.eq.equal) then
call getsym
else
if(psym.ne.less.and.psym.ne.great.and.
$ psym.ne.not) goto 32
endif
endif
if(sym.eq.eol .or. sym.eq.comma .or. sym.eq.semi) goto 50
c . next line for recursive index
if(sym.eq.lparen) goto 31
else if(sym.eq.eol) then
if(bcount.eq.0) then
call error(3)
goto 98
else
if(lpt(4).eq.lpt(6)) then
call getlin(1)
if(err.gt.0) goto 98
else
lpt(4)=lpt(4)+1
call getsym
endif
endif
endif
goto 31
c
32 lpt(4)=lpt(5)
icount=0
char1=lparen
call getsym
33 call getsym
excnt = excnt+1
if ( eptover(1,psiz)) goto 98
call putid(ids(1,pt), id)
pstk(pt) = excnt+1000*icount
rstk(pt) = 702
c *call* expr
goto 81
35 continue
call putid(id,ids(1,pt))
icount=int(pstk(pt)/1000)
excnt = pstk(pt)-1000*icount
pt = pt-1
if (sym .eq. comma) goto 33
if (sym .ne. rparen) then
call error(3)
if (err .gt. 0) goto 98
endif
if (sym .eq. rparen) call getsym
c next lines for recursive index
if(sym.eq.lparen) then
if(excnt.gt.1) then
c call error(3)
c return
if(comp(1).eq.0) then
c . form list with individual indexes
call mkindx(0,excnt)
if(err.gt.0) return
else
if (compil(19,0,excnt,0,0)) then
if (err.gt.0) return
endif
endif
excnt=1
endif
excnt=0
icount=icount+1
goto 33
endif
if(icount.gt.0) then
if(comp(1).eq.0) then
c . form list with individual indexes
call mkindx(icount+1,excnt)
if(err.gt.0) return
else
if (compil(19,icount+1,excnt,0,0)) then
if (err.gt.0) return
endif
endif
excnt=1
endif
c end of code for recursive index
goto 60
c
c multiple lhs
c-----------------
40 lpt(5) = lpt(4)
pts = pt
call getsym
41 if (sym .ne. name) goto 43
call putid(id,syn)
call getsym
if (sym .eq. right) goto 42
if (sym .eq. comma) call getsym
if ( eptover(1,psiz)) goto 98
lhs = lhs+1
pstk(pt) = 0
rstk(pt) = 0
call putid(ids(1,pt),id)
goto 41
42 call getsym
if (sym .eq. equal) then
if(char1.eq.equal) goto 43
goto 60
endif
43 lpt(4) = lpt(5)
pt = pts
lhs = 1
sym = left
char1 = lin(lpt(4)-1)
call putid(id,ans)
goto 60
c
c
c lhs is really rhs
c-----------------------
50 lpt(4)=lpt(5)
char1=lparen
sym=name
call putid(syn,id)
call putid(id,ans)
goto 61
c
c lhs finished, start rhs
c----------------------------
60 if (sym .eq. equal) call getsym
c fun=0
c if(sym.eq.name) then
c check if name is a function
c fin=-2
c call funs(syn)
c endif
61 if ( eptover(1,psiz)) goto 98
call putid(ids(1,pt),id)
pstk(pt) = excnt
rstk(pt) = 703
c *call* expr
goto 81
65 continue
if (rstk(pt-lhs).eq.313) then
c store new variable as "named" at the top of the stack
if (sym.eq.rparen .or. sym.eq.comma) then
call mrknmd()
if(err.gt.0) goto 98
goto 83
else
call error(40)
goto 98
endif
endif
if (sym.eq.semi .or. sym.eq.comma .or. sym.eq.eol) goto 70
call error(40)
goto 98
c
c store results
c-------------------
70 rhs = pstk(pt)
if(err1.ne.0) goto 74
if(rhs.eq.0) goto 72
fin=-3
call stackg(ids(1,pt))
if (err .gt. 0) goto 98
rhs=rhs+2
pstk(pt)=lhs
rstk(pt)=704
fin=insert
c *call* allops(insert)
goto 91
71 lhs=pstk(pt)
72 call stackp(ids(1,pt),0)
if (err .gt. 0) goto 98
c topk points on the newly saved variable
topk=fin
c print if required
c----------------------
if(lct(4).lt.0.or.fin.eq.0) goto 74
if(.not.((sym.ne.semi.and.lct(3).eq.0).or.
& (sym.eq.semi.and.lct(3).eq.1))) goto 74
73 call print(ids(1,pt),topk,wte)
if (err .gt. 0) goto 98
if(topk.eq.0) goto 74
c overloaded display, call a macro
if ( eptover(1,psiz)) goto 98
rstk(pt)=708
pstk(pt)=sym
ids(1,pt)=sym
if(fun.eq.0) goto 88
goto 85
731 continue
sym=pstk(pt)
pt=pt-1
goto 73
c
74 pt = pt-1
lhs = lhs-1
if (lhs .gt. 0) goto 70
c
c finish statement
c---------------------
75 fin = 0
p = 0
r = 0
if (pt .gt. 0) p = pstk(pt)
if (pt .gt. 0) r = rstk(pt)
if (ddt .eq. 4) then
write(buf(1:22),'(4i4,3i2)') pt,r,p,lpt(1),niv,macr,paus
call basout(io,wte,
+ ' finish pt:'//buf(1:4)//' rstk(pt):'//buf(5:8)//
+ ' pstk(pt):'//buf(9:12)//' lpt(1):'//buf(13:16)//
+ ' niv:'//buf(17:18)//' macr:'//buf(19:20)//
+ ' paus:'//buf(21:22))
endif
if(err1.ne.0) then
if(rstk(pt).eq.502.and.rstk(pt-1).eq.903) then
c catched and continue on error in an execstr instruction
goto 88
endif
if(err2.eq.0) err2=err1
err1=0
imode=abs(errct/100000)
if(imode-8*int(imode/8).eq.2) iflag=.true.
endif
toperr=top
c fin instruction
if(sym.ne.eol) goto 15
c gestion des points d'arrets dynamiques
if(wmac.ne.0) then
call whatln(lpt(1),lpt(2)-1,lpt(6),nlc,l1,ifin)
do 76 ibpt=lgptrs(wmac),lgptrs(wmac+1)-1
if(lct(8)-nlc.eq.bptlg(ibpt)) then
call cvname(macnms(1,wmac),buf(1:nlgh),1)
write(buf(nlgh+2:nlgh+7),'(i5)') lct(8)-nlc
call msgs(32,0)
call cvstr(ifin-l1+1,lin(l1),buf,1)
call basout(io,wte,buf(1:ifin-l1+1))
iflag=.true.
goto 77
endif
76 continue
endif
77 continue
c
if(comp(1).ne.0) call seteol
c fin ligne
if(int(r/100).ne.8) goto 10
c fin d'une instruction dans une clause
if(comp(1).ne.0) then
k=lpt(6)
if(lin(k-1).eq.eol.and.lin(k).eq.eol) then
call error(47)
goto 98
endif
endif
if(lpt(4).eq.lpt(6)) then
call getlin(1)
else
lpt(4)=lpt(4)+1
call getsym
endif
goto 15
c
c simulate recursion
c-----------------------
80 icall=0
call clause
if (err .gt. 0) goto 98
goto(81,82,83,91,88,90,15,80,85),icall
if (pt .le. 0) goto 15
r = rstk(pt)/100
goto(81,82,83,91,88,90,92,80,85),r
goto 99
c
81 icall=0
call expr
if (err .gt. 0) goto 98
goto(81,82,83,91,88,90,15,80,85),icall
r = rstk(pt)/100
goto(81,82,83,91,88,90,92,80,85),r
goto 99
c
82 icall=0
call terme
if (err .gt. 0) goto 98
goto(81,82,83,91,88,90,15,80,85),icall
r = rstk(pt)/100
goto(81,82,83,91,88,90,92,80,85),r
goto 99
c
83 icall=0
call fact
if (err .gt. 0) goto 98
goto(81,82,83,91,88,90,15,80,85),icall
r = rstk(pt)/100
goto(81,82,83,91,88,90,92,80,85),r
goto 99
c
85 icall=0
if(err1.ne.0) then
if(int(rstk(pt)/100).eq.9) then
if(rstk(pt).eq.901.or.rstk(pt).eq.904) then
c *call* matfns
return
elseif(rstk(pt).ne.903) then
pt=pt-1
goto 86
endif
else
goto 86
endif
endif
c compilation matfns: <100*fun rhs lhs fin>
if (compil(100*fun,rhs,lhs,fin,0)) then
if (err.gt.0) goto 98
goto 86
else
c *call* matfns
return
endif
86 if (err .gt. 0) goto 98
goto(81,82,83,91,88,90,15,80,85),icall
r = rstk(pt)/100
goto(81,82,83,91,88,90,92,80,85),r
goto 99
c
88 icall=0
call macro
if (err .gt. 0) goto 98
goto(81,82,83,91,88,90,10,80,85),icall
r = rstk(pt)/100
goto(81,82,83,91,88,90,92,80,85,89),r
goto 99
89 fun=99
return
c
90 icall=0
call run
if (err .gt. 0) goto 98
if (fun .eq. 99) return
c last label is used to handle return from abort
goto(81,82,83,91,88,90,15,80,85,05),icall
r = rstk(pt)/100
goto(81,82,83,91,88,90,92,80,85),r
goto 99
c
91 icall=0
call allops
if (err .gt. 0) goto 98
goto(81,82,83,91,88,90,15,80,85),icall
r = rstk(pt)/100
goto(81,82,83,91,88,90,92,80,85),r
goto 99
c
92 goto(17,35,65,71,65,97,94,731) rstk(pt)-700
goto 99
c
93 continue
c command like function and macro call
if ( eptover(1,psiz)) goto 98
pstk(pt)=1
call putid(ids(1,pt),ans)
rstk(pt)=707
if (fun .gt. 0) then
c *call* matfns
goto 85
else
if (comp(1).ne.0) then
rhs=rhs+1
fin=extrac
c *call* allops(extrac)
goto 91
else
fin=lstk(fin)
c *call* macro
goto 88
endif
endif
94 goto 71
c
96 continue
c asynchronous events handling
call getmen(buf,lb,nentry)
call bexec(buf(1:lb),lb,ierr)
if(ierr.ne.0) goto 15
if ( eptover(1,psiz)) goto 98
pstk(pt)=top
rstk(pt)=706
c *call* macro
goto 88
97 top=pstk(pt)-1
pt=pt-1
goto 15
98 continue
c error recovery
c-------------------
imode=abs(errct)/100000
imode=imode-8*int(imode/8)
if(imode.eq.3) then
fun=99
return
endif
c
c error in an external (niv), during compilation (comp) or in a pause
if(pt.ne.0) then
if(rstk(pt).eq.503.and.rio.eq.rte) then
comp(1)=0
goto 12
endif
c added 16/04/97
if(err1.ne.0.and.rstk(pt).eq.502) then
c catched error while compiling
goto 88
endif
endif
c error in an external
if(niv.gt.0) then
return
else
c error in a pause
comp(1)=0
goto 05
endif
c
99 call error(22)
goto 01
c
end
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