/
lex.sbl
640 lines (561 loc) · 24.8 KB
/
lex.sbl
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-title lex phase 1 translation from minimal to lexical tokens
-stitl initialization
* Copyright 1987-2012 robert b. k. dewar and mark emmer.
* Copyright 2012-2017 david shields
* This file is part of macro spitbol.
* macro spitbol is free software: you can redistribute it and/or modify
* it under the terms of the gnu general public license as published by
* the free software foundation, either version 2 of the license, or
* (at your option) any later version.
* macro spitbol is distributed in the hope that it will be useful,
* but without any warranty; without even the implied warranty of
* merchantability or fitness for a particular purpose. see the
* gnu general public license for more details.
* you should have received a copy of the gnu general public license
* along with macro spitbol. if not, see <http://www.gnu.org/licenses/>.
* usage:
* sbl lex.lex.sbl
* The variablel *parm* specifies the base of the input file, with
* the default value *sbl*.
* This program takes minimal statements and parses them up into
* a stream of lexemes, or lexemes. It performs equ * substitution and
* conditional assembly.
* It is based on earlier translators written by David Shields, Steve Duff
* and Robert Goldberg.
-eject
* procedure definitions
define('init()') :(init.end)
init
&anchor = 1
&trim = 1
minlets = 'abcdefghijklmnopqrstuvwxy_z' 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
nos = '0123456789'
p.nos = span(nos) rpos(0)
p.exp = 'e' any('+-') span(nos)
p.real = span(nos) '.' (span(nos) | null) (p.exp | null) rpos(0)
tab = char(9)
* sepchar separates fields in output file
sepchar = '|'
* catab is the transfer vector for routing control to generators
* for conditional assembly directives.
catab = table( 11,,.badop )
catab['.def'] = .defop; catab['.undef'] = .undefop
catab['.if'] = .ifop; catab['.then'] = .thenop
catab['.else'] = .elseop; catab['.fi'] = .fiop
* symtbl tracks defined conditional symbols. (undefined symbols
* are assigned null values in symtbl.)
symtbl = table( 11 )
* statestk maintains all state information while processing conditional
* statements. level indexes the top entry. another variable, top,
* has a copy of savestk[level].
statestk = array( 30 )
level = 0
top =
* each state entry in statestk contains state information about
* the processing for each active .if. the state is maintained
* as 2 fields:
* result the result of the .if expression evaluation-
* true, false, or bypass
* mode whether processing then or else portion of .if
data('state(result,mode)')
false = 0
true = 1
bypass = 2
else = 0
then = 1
* processrec is indexed by the current result and mode to determine
* whether or not a statement should be processed and written to the
* output file.
processrec = array( false ':' bypass ',' else ':' then,0 )
processrec[true,then] = 1
processrec[false,else] = 1
* p.condasm breaks up conditional assembly directives.
* p.condasm breaks up conditional assembly directives.
sep = ' '
p.condasm = ( break(sep) | rem ) . condcmd
+ ( span(sep) | '' )
+ ( break(sep) | rem ) . condvar
p.argskel1 = fence(break(',') | rem) $ argthis *differ(argthis)
p.argskel2 = len(1) fence(break(',') | rem) $ argthis *differ(argthis)
* ityptab is table mapping from common operands to gross type
ityptab = table(21)
ityptab['0'] = 1; ityptab['1'] = 1; ityptab['wa'] = 8
ityptab['wb'] = 8; ityptab['wc'] = 8; ityptab['xl'] = 7
ityptab['xr'] = 7; ityptab['xs'] = 7; ityptab['xt'] = 7
ityptab['(xl)'] = 9; ityptab['(xr)'] = 9; ityptab['(xs)'] = 9
ityptab['(xt)'] = 9; ityptab['-(xl)'] = 11; ityptab['-(xr)'] = 11
ityptab['-(xs)'] = 11; ityptab['-(xt)'] = 11;
ityptab['(xl)+'] = 10; ityptab['(xr)+'] = 10;
ityptab['(xs)+'] = 10; ityptab['(xt)+'] = 10
* opformtab is table mapping general op formats to row index for
* validform array.
opformtab = initmap(
+ 'val[1]reg[2]opc[3]ops[4]opw[5]opn[6]opv[7]addr[8]'
+ 'x[9]w[10]plbl[11](x)[12]integer[13]real[14]'
+ 'dtext[15]eqop[16]int[17]pnam[18]')
* validform is array that validates general op formats (opv, etc).
* the first index is named type val=1 reg=2 opc=3 ops=4 opw=5
* opn=6 opv=7 addr=8 x=9 w=10 plbl=11 (x)=12 integer=13 real=14
* dtext=15 eqop=16 int=17 pnam=18
* the second argument is gross type 01=int 02=dlbl ... 27=dtext
* the entry [i,j] is nonzero is gross type j is valid for named
* type i.
validform = array('18,27',0)
validform[1,1] = validform[1,2] = validform[2,7] = validform[2,8] =
+ validform[3,9] = validform[3,10] = validform[3,11] = validform[4,3] =
+ validform[4,4] = validform[4,9] = validform[4,12] = validform[4,13] =
+ validform[4,14] = validform[4,15] = validform[5,3] = validform[5,4] =
+ validform[5,8] = validform[5,9] = validform[5,10] = validform[5,11] =
+ validform[5,12] = validform[5,13] = validform[5,14] = validform[5,15] =
+ validform[6,3] = validform[6,4] = validform[6,7] = validform[6,8] =
+ validform[6,9] = validform[6,10] = validform[6,11] = validform[6,12] =
+ validform[6,13] = validform[6,14] = validform[6,15] = validform[7,3] =
+ validform[7,4] = validform[7,7] = validform[7,8] = validform[7,9] =
+ validform[7,10] = validform[7,11] = validform[7,12] = validform[7,13] =
+ validform[7,14] = validform[7,15] = validform[7,18] = validform[7,19] =
+ validform[7,20] = validform[7,21] = validform[7,22] = validform[8,1] =
+ validform[8,2] = validform[8,3] = validform[8,4] = validform[8,5] =
+ validform[8,6] = validform[9,7] = validform[10,8] = validform[11,6] =
+ validform[12,9] = validform[13,16] = validform[14,17] =
+ validform[15,27] = validform[16,24] = validform[17,1] =
+ validform[18,6] = validform[18,23] = 1
labcnt = noutlines = nlines = nstmts = ntarget = nerrors = 0
p.minlabel = any(minlets) any(minlets) any(minlets nos)
+ any(minlets nos) any(minlets nos)
* p.csparse parses out the components of the input line in stmt,
* and puts them into the locals: label, opcode, operands, comment
p.csparse = (((p.minlabel . label) | (' ' '' . label)) ' '
+ len(3) . opcode
+ ((' ' (break(' ') | rtab(0)) . operands
+ (span(' ') | '') rtab(0) . comment) |
+ (rpos(0) . operands . comment))) |
+ ('.' '' . label mincond . opcode
+ ((tab(7) '.' len(4) . operands) | (rpos(0) . operands))
+ '' . comment)
* p.csoperand breaks out the next operand in the operands string.
p.csoperand = (break(',') . operand ',') |
+ ((len(1) rtab(0)) . operand)
* p.csdtc is a pattern that handles the special case of the
* minimal dtc op
p.csdtc = ((p.minlabel . label) | (' ' '' . label))
+ len(7) (len(1) $ char break(*char) len(1)) . operand
+ (span(' ') | '') rtab(0) . comment
* The p.equ.rip pattern parses out the components of an equ expression.
p.equ.rip = ( span(nos) . num1 | p.minlabel . sym1 )
+ ( any('+-') . oprtr | '' )
+ ( span(nos) . num2 | p.minlabel . sym2 | '' )
+ rpos(0)
* optab is a table that maps opcodes into their argument
* types and is used for argument checking and processing.
optab = initmap(
+ 'flc[w]add[opn,opv]adi[ops]adr[ops]anb[w,opw]aov[opv,opn,plbl]atn[none]'
+ 'bod[opn,plbl]bev[opn,plbl]'
+ 'bct[w,plbl]beq[opn,opv,plbl]bge[opn,opv,plbl]bgt[opn,opv,plbl]'
+ 'bhi[opn,opv,plbl]ble[opn,opv,plbl]blo[opn,opv,plbl]'
+ 'blt[opn,opv,plbl]bne[opn,opv,plbl]bnz[opn,plbl]brn[plbl]'
+ 'bri[opn]bsw[x,val,*plbl bsw]btw[reg]'
+ 'bze[opn,plbl]ceq[ops,ops,plbl]'
+ 'chk[none]chp[none]cmb[w]cmc[plbl,plbl]cne[ops,ops,plbl]cos[none]'
+ 'csc[x]ctb[w,val]ctw[w,val]cvd[none]cvm[plbl]dac[addr]dbc[val]dca[opn]'
+ 'dcv[opn]def[def]dic[integer]drc[real]dtc[dtext]dvi[ops]dvr[ops]ejc[none]'
+ 'else[else]end[none end]enp[none]ent[*val ent]equ[eqop equ]'
+ 'erb[int,text erb]err[int,text err]esw[none esw]etx[none]exi[*int]'
+ 'exp[int]fi[fi]ica[opn]icp[none]icv[opn]ieq[plbl]if[if]iff[val,plbl iff]'
+ 'ige[plbl]igt[plbl]ile[plbl]ilt[plbl]ine[plbl]ino[plbl]inp[ptyp,int inp]'
+ 'inr[none]iov[plbl]itr[none]jsr[pnam]lch[reg,opc]lct[w,opv]lcp[reg]'
+ 'lcw[reg]ldi[ops]ldr[ops]lei[x]lnf[none]lsh[w,val]lsx[w,(x)]mcb[none]'
+ 'mfi[opn,*plbl]mli[ops]mlr[ops]mnz[opn]mov[opn,opv]mti[opn]'
+ 'mvc[none]mvw[none]mwb[none]ngi[none]ngr[none]nzb[w,plbl]'
+ 'orb[w,opw]plc[x,*opv]ppm[*plbl]prc[ptyp,val prc]psc[x,*opv]req[plbl]'
+ 'rge[plbl]rgt[plbl]rle[plbl]rlt[plbl]rmi[ops]rne[plbl]rno[plbl]'
+ 'rov[plbl]rsh[w,val]rsx[w,(x)]rti[*plbl]rtn[none]sbi[ops]'
+ 'sbr[ops]sch[reg,opc]scp[reg]sec[none sec]sin[none]sqr[none]ssl[opw]'
+ 'sss[opw]sti[ops]str[ops]sub[opn,opv]tan[none]then[then]trc[none]'
+ 'ttl[none ttl]undef[undef]wtb[reg]xob[w,opw]zer[opn]zgb[opn]zrb[w,plbl]'
+ 'zzz[int]' )
* prctab is table of procedures declared in inp that is used to
* check for consistency of inp/prc statements.
prctab = table(60)
* equates is used by g.equ and . it contains a directory of
* all labels that were defined by equ instructions.
equates = table(257)
* labtab is a table that maps each label to the section in which
* it is defined, except labels defined in the definitions section
* (section 2).
labtab = table(150,150)
* bsw is a flag that indicates whether or not a bsw...esw range
* is being processed.
bsw = 0
trandate = date()
parm = 'sbl'
filenami = parm '.min'
filenamo = parm '.lex'
output = rpad('input file:',15) filenami
output = rpad('output file:',15) filenamo
flcflag = 'n'
flcflag = 'y'
ejcflag = 'n'
ejcflag = 'y'
main1
output(.outfile,2,filenamo) :s(main2)
output = "cannot open lexeme file: " filenamo :(end)
main2
input(.infile,1,filenami) :s(main3)
error('cannot open minimal file ' filenami)
main3
p.opsk1 = (break(' ') | rem) . argskel
equ_defs = initmap(
+ 'nstmx[10]cfp_s[15]cfp_x[3]e_srs[100]e_sts[1000]e_cbs[500]e_hnb[257]'
+ 'e_hnw[3]e_fsp[15]e_sed[25]ch_ua[65]ch_ub[66]ch_uc[67]ch_ud[68]ch_ue[69]'
+ 'ch_uf[70]ch_ug[71]ch_uh[72]ch_ui[73]ch_uj[74]ch_uk[75]ch_ul[76]'
+ 'ch_um[77]ch_un[78]ch_uo[79]ch_up[80]ch_uq[81]ch_ur[82]ch_us[83]'
+ 'ch_ut[84]ch_uu[85]ch_uv[86]ch_uw[87]ch_ux[88]ch_uy[89]ch_uz[90]'
+ 'ch_d0[48]ch_d1[49]ch_d2[50]ch_d3[51]ch_d4[52]ch_d5[53]ch_d6[54]ch_d7[55]'
+ 'ch_d8[56]ch_d9[57]ch_la[97]ch_lb[98]ch_lc[99]ch_ld[100]ch_le[101]ch_lf'
+ '[102]ch_lg[103]ch_lh[104]ch_li[105]ch_lj[106]ch_lk[107]ch_ll[108]'
+ 'ch_lm[109]ch_ln[110]ch_lo[111]ch_lp[112]ch_lq[113]ch_lr[114]ch_ls[115]'
+ 'ch_lt[116]ch_lu[117]ch_lv[118]ch_lw[119]ch_lx[120]ch_ly[121]ch_l_[122]'
+ 'ch_am[38]ch_as[42]ch_at[64]ch_bb[60]ch_bl[32]ch_br[124]ch_cl[58]'
+ 'ch_cm[44]ch_dl[36]ch_dt[46]ch_dq[34]ch_eq[61]ch_ex[33]ch_mn[45]ch_nm[35'
+ ']ch_nt[126]ch_pc[37]ch_pl[43]ch_pp[40]ch_rb[62]ch_rp[41]ch_qu[63]'
+ 'ch_sl[47]ch_sm[59]ch_sq[39]ch_u_[95]ch_ob[91]ch_cb[93]ch_ht[9]ch_vt[11]'
+ 'ch_ey[94]iodel[32]cfp_a[256]cfp_b[8]cfp_c[8]cfp_f[16]cfp_i[1]'
+ 'cfp_l[18446744073709551616]cfp_m[9223372036854775807]cfp_n[64]'
+ 'cfp_r[1]cfp_u[128]')
:(return)
init.end
-stitl initmap(str)index,val
define('initmap(str),index,val') :(initmap.end)
initmap
initmap = table(size(str))
initmap.next
str (break('[') $ index len(1) break(']') $ val len(1)) =:f(return)
val = convert( val,'integer' )
val = ident(val,lastval) lastval
lastval = val
initmap[index] = val :(initmap.next)
initmap.end
-stitl crack(line)operands,operand,char
define('crack(line)operands,operand,char') :(crack.end)
* break out current line into fields
crack
nstmts = nstmts + 1
line p.csparse :f(cs03)
op1 = op2 = op3 = typ1 = typ2 = typ3 =
ident(opcode,'dtc') :s(cs02)
operands p.csoperand = :f(cs01)
op1 = operand
operands p.csoperand = :f(cs01)
op2 = operand
operands p.csoperand :f(cs01)
op3 = operand
cs01 :(return)
cs02 line p.csdtc :f(cs03)
op1 = operand
:(cs01)
cs03
error('source line syntax error') :(freturn)
crack.end
-stitl error(text)
define('error(text)') :(error.end)
error
outfile = '* *???* ' thisline
outfile = '* ' text
+ (ident(lasterror),'. last error was line ' lasterror)
lasterror = noutlines
noutlines = noutlines + 2
nerrors = nerrors + 1
+ :(dsout)
error.end
-stitl argform(arg)
define('argform(arg)') :(argform.end)
argform
argform = 0
ident(t = ityptab[arg]) :s(argform1)
argform = t :(return)
argform1
arg p.nos :s(argform.int)
arg '=' :s(argform.eq)
arg '*' :s(argform.star)
arg any('+-') :s(argform.snum)
arg break('(') :s(argform.index)
ident(t = labtab[arg]) :s(argform.plbl)
argform = t :(return)
argform.plbl
labtab[arg] = 6
argform = 6 :(return)
argform.eq
arg len(1) rem . itypa
itypa = labtab[itypa]
argform = (eq(itypa,2) 18, eq(itypa,6) 22,
+ gt(itypa,2) itypa + 17) :s(return)
argform = 22
labtab[itypa] = 5 :(return)
argform.star
arg len(1) rem . t :f(return)
eq(labtab[t],2) :f(return)
argform = 19 :(return)
argform.int
argform = 1 :(return)
argform.snum
arg len(1) p.nos :f(argform.sreal)
argform = 16 :(return)
argform.sreal
arg len(1) p.real :f(return)
argform = 17 :(return)
argform.index
arg break('(') . t '(x' any('lrst') ')' rpos(0) :f(return)
t p.nos :f(argform.index1)
argform = 12 :(return)
argform.index1
ident(t = labtab[t]) :s(return)
argform = (eq(t,2) 13, eq(t,3) 15, eq(t,4) 14) :(return)
argform.end
-stitl argtype(op,typ)
define('argtype(op,typ)') :(argtype.end)
argtype
argtype = 0
typ '*' =
ident(typ,'text') :s(arg.text)
ident(typ,'dtext') :s(arg.dtext)
ident(typ,'ptyp') :s(arg.ptyp)
ident(typ,'eqop') :s(arg.eqop)
itype = argform(op)
opform = opformtab<typ>
argtype = ne(validform<+opform,itype>) itype :(return)
arg.text
argtype = 26 :(return)
arg.dtext
argtype = 27 :(return)
arg.ptyp
op any('rne') :f(return)
argtype = 25 :(return)
arg.eqop
op1 = ident(op,'*')
+ equ_defs[label]
argtype = 24 :(return)
argtype.end
-stitl labenter()tlab
define('labenter()tlab') :(labenter.end)
labenter
ident(label) :s(return)
labtab[label] =
+ (eq(sectnow,2) 2, eq(sectnow,3) 4, eq(sectnow,4) 3 , gt(sectnow,4) 6) :(return)
labenter.end
define('outstmt(label,opcode,op1,op2,op3,comment)t,stmtout'):(outstmt.end)
-stitl outstmt(label,opcode,op1,op2,op3,comment)t,stmtout
outstmt
outfile = sepchar label sepchar opcode sepchar
+ (ident(typ1), typ1 ',') op1 sepchar
+ (ident(typ2), typ2 ',') op2 sepchar
+ (ident(typ3), typ3 ',') op3 sepchar comment
+ sepchar nlines
ntarget = ntarget + 1
noutlines = noutlines + 1
+ :(return)
outstmt.end
-stitl rdline()
define('rdline()') :(rdline.end)
rdline
rdline = infile :f(rl03)
nlines = nlines + 1
differ( rdline ) :s(rdline.1)
* skip blank line.
:(rdline)
outfile =
noutlines = noutlines + 1 :(rdline)
rdline.1
leq( substr( rdline,1,1 ),'.' ) :f(other)
rdline ? p.condasm :s( $catab[condcmd] )
rl00
leq( substr( rdline,1,1 ),'*' ) :f(rl01)
* skip full line comment
:(rdline)
outfile = ident(flcflag,'y') rdline :f(rdline)
noutlines = noutlines + 1 :(rdline)
rl01
leq( substr( rdline,1,1 ),'>' ) :f(return)
c = code(substr( rdline, 2 ) "; :(rdline)") :s<c>
output = "error compiling snobol4 statement"
:(rl03)
rl03
rdline = ' end' :(rl01)
synerr output = incnt '(syntax error):' rdline :(rdline)
defop
ident( condvar ) :s(synerr)
differ( ignore_defs ) :s(rdline)
eq( level ) :s(defok)
eq( processrec[result(top),mode(top)] ) :s(rdline)
defok
symtbl[condvar] = 1 :(rdline)
undefop
ident( condvar ) :s(synerr)
eq( level ) :s(undok)
eq( processrec[result(top),mode(top)] ) :s(rdline)
undok
symtbl[condvar] = :(rdline)
ifop
ident( condvar ) :s(synerr)
eq( level ) :s(ifok)
ne( processrec[result(top),mode(top)] ) :s(ifok)
level = level + 1
top = statestk[level] = state(bypass,then) :(rdline)
ifok
level = level + 1
top = statestk[level] = state(
+ ( differ( symtbl[condvar] ) true,false ),
+ then ) :(rdline)
thenop
differ(condvar) :s(synerr)
eq(level) :s(synerr)f(rdline)
elseop
differ(condvar) :s(synerr)
mode(top) = ne( level ) else :s(rdline)f(synerr)
fiop
differ(condvar) :s(synerr)
level = ne( level ) level - 1 :f(synerr)
top = ( ne( level ) statestk[level],'' ) :(rdline)
other
eq( level ) :s(rl00)
eq( processrec[result(top),mode(top)] ) :s(rdline)f(rl00)
rdline.end
define('report(num,text)') :(report.end)
report
output = lpad(num,10) ' ' text :(return)
report.end
* Main
output = 'start scan'
* &ftrace = 10000
* &trace = 10000
init()
* Main loop - scan all the lines in the input file.
dsout
dostmt
thisline = rdline()
crack(thisline) :f(dsout)
differ(label) labenter()
argerrs = 0
opskel = optab[opcode] :f(ds01)
ident(opskel) error("opcode not known")
opskel p.opsk1 =
ident(argskel,'none') :s(dos10)
dos01
ident(argskel) :s(dos05)
argskel p.argskel1 =
argthis '*' ident(op1) :s(dos05)
typ1 = argtype(op1,argthis)
argerrs = eq(typ1) argerrs + 1
ident(argskel) :s(dos05)
argskel p.argskel2 =
argthis '*' ident(op2) :s(dos05)
typ2 = argtype(op2,argthis)
argerrs = eq(typ2) argerrs + 1
ident(argskel) :s(dos05)
argskel p.argskel2 =
argthis '*' ident(op3) :s(dos05)
typ3 = argtype(op3,argthis) :(dos05)
argerrs = eq(typ3) argerrs + 1
dos10
dos05
gt(argerrs) error('arg type not known')
opskel ' ' = :f(dsgen)
:($('g.' opskel))
:(g.h)
ds01
error('bad op-code') :(dsout)
ds.typerr
error('operand type zero') :(dsout)
dsgen
outstmt(label,opcode,op1,op2,op3,comment) :(dsout)
-stitl generators
g.bsw
ub = ( integer( op2 ) op2, equates[op2] )
iffar = integer( ub )
+ array('0:' ub - 1,sepchar sepchar) :f(g.bsw1)
dplbl = op3
bsw = 1 :(dsgen)
g.bsw1
error("non-integer lower bound for bsw")
g.iff
(eq( bsw ) error("iff without bsw"))
ifftyp = ( integer(op1) '1', '2')
iffval = ( integer( op1 ) op1, equates[op1] )
iffar[iffval] = integer( iffval )
+ ifftyp ',' op1 sepchar typ2 ',' op2 sepchar comment
+ :s(dsout)
error("non-integer iff value")
g.equ
equates[label] = ident(op1,'*')
+ equ_defs[label] :s(dsgen)
num1 = num2 = sym1 = sym2 = oprtr =
op1 p.equ.rip :f(g.equ2)
num1 = differ(sym1) equates[sym1]
num2 = differ(sym2) equates[sym2]
val = (differ(oprtr) eval( num1 ' ' oprtr ' ' num2 ), num1):f(g.equ3)
g.equ1
equates[label] = val :(dsgen)
g.equ2
error("equ operand syntax error")
g.equ3
error("equ evaluation failed: " num1 ' ' oprtr ' ' num2 ' "' op1 '"' )
g.esw
(eq(bsw) error("esw without bsw"))
iffindx = 0
g.esw1
iffar[iffindx] break(sepchar ) $ val len(1)
+ break( sepchar ) $ plbl len(1)
+ rem $ cmnt
+ :f(g.esw2)
val = ident( val ) '1,' iffindx
plbl = ident( plbl ) '6,' dplbl
(ident(dplbl) ident(plbl) error("missing iff value: "
+ val " without plbl in preceding bsw"))
outstmt(,'iff',val,plbl,,cmnt)
iffindx = iffindx + 1 :(g.esw1)
g.esw2
iffar = :(dsgen)
g.end
outstmt(,'end',,,,comment)
(ne(level) error(" unclosed if conditional clause"))
report(nlines,'lines read')
report(nstmts,'statements processed')
report(ntarget,'target code lines produced')
report(&stcount,'spitbol statements executed')
differ(nerrors) report(nerrors,'errors detected')
report =
+ differ(lasterror) ' the last error was in line ' lasterror
&code = ne(nerrors) 2001
report(collect() * 5,'free bytes')
t = convert(prctab,'array') :f(g.end.2)
output = ' procedures with inp, no prc'
i = 1
g.end.1
output = t[i,1] ' ' t[i,2] :f(g.end.2)
i = i + 1 :(g.end.1)
g.end.2
:(end)
g.ent
labtab[label] = 5 :(dsgen)
g.h :(dsgen)
g.sec
sectnow = sectnow + 1 :(dsgen)
g.ttl
thisline len(10) rem . t
t span(' ') =
outstmt(,'ttl','27,' t) :(dsout)
g.erb
g.err thisline break(',') len(1) rem . t
outstmt(label,opcode,op1, t) :(dsout)
g.inp
ident(label) error('no label for inp')
differ(t = prctab[label]) error('duplicate inp')
prctab[label] = op1 :(dsgen)
g.prc
ident(label) error('no label for prc')
ident(t = prctab[label]) error('missing inp')
differ(t,op1) error('inconsistent inp/prc')
prctab[label] = :(dsgen)
lower
lower = replace(s,'ABCDEFGHIJKLMNOPQRSTUVWXYZ',
+ 'abcdefghijklmnopqrstuvwxyz') :(return)
end