COMMENT ⊗   VALID 00007 PAGES
C REC  PAGE   DESCRIPTION
C00001 00001
C00002 00002	{$NOMAIN	Editor: Plain old aux routines mostly called by Edit }
C00027 00003	{ Externally defined routines from elsewhere: }
C00030 00004	(* aux routines: setPPSize, flushOldEnvironments, saveOutermostEnv *)
C00043 00005	(* Aux routine: setUpStmnt *)
C00045 00006	(* aux routines: fileParse, writeProg, readProg *)
C00049 00007	(* Aux routines called by edit: getEcmd, doSetCmd *)
C00055 ENDMK
C⊗;
{$NOMAIN	Editor: Plain old aux routines mostly called by Edit }

const

	(* Constants from EDIT *)
      	maxLines = 28;		(* smaller on the 11 than on the 10 *)
      	maxPPLines = 18;
      	maxBpts = 25;
      	maxTBpts = 20;	(* max could be exceeded by huge case stmnt *)
	listinglength = 2000;	(* Length of Listingarray *)

(* Random type declarations for OMSI/SAIL compatibility *)

type

  byte = 0..255;	(* doesn't really belong here, but... *)
  ascii = char; 
  atext = text;

{ Define all the pointer types here }

strngp = ↑strng;
statementp = ↑statement;
varidefp = ↑varidef;
nodep = ↑node;
identp = ↑ident;
tokenp = ↑token;
reswordp = ↑resword;
pdbp = ↑pdb;
envheaderp = ↑envheader;
enventryp = ↑enventry;
environp = ↑environment;
cmoncbp = ↑cmoncb;
linerecp = ↑linerec;
cursorpp = ↑cursorp;	{Ron's style, not mine}

(* This one is used whenever a pointer is needed for which the 	*)
(* definition is missing from this file; naturally, all 	*)
(* pointers use the same space 					*)

dump = ↑integer;

(* datatype definitions *)

datatypes = (pconstype, varitype, svaltype, vectype, rottype, transtype,
	     frametype, eventtype, strngtype, labeltype, proctype, arraytype,
	     reftype, valtype, cmontype, nulltype, undeftype,
	     dimensiontype, mactype, macargtype, freevartype);

scalar = real;

cstring = packed array [1..10] of ascii;
c4str = packed array [1..4] of ascii;
c5str = packed array [1..5] of ascii;
c20str = packed array [1..20] of ascii;
linestr = packed array [1..130] of ascii;

strng = record
	  next: strngp;
	  ch: cstring;
	end;


(* statement definitions *)

stmntypes = (progtype, blocktype, coblocktype, endtype, coendtype,
		fortype, iftype, whiletype, untiltype, casetype,
		calltype, returntype,
		printtype, prompttype, pausetype, aborttype, assigntype,
		signaltype, waittype, enabletype, disabletype, cmtype,
		affixtype, unfixtype,
		movetype, operatetype, opentype, closetype, centertype,
		stoptype, retrytype,
		requiretype, definetype, macrotype, commenttype, dimdeftype,
		setbasetype, wristtype, tovaltype, declaretype, emptytype);
		(* more??? *)

statement = packed record
		next, last: statementp; (* ↑ to lexical tokens? *)
		stlab: varidefp;
		exprs: nodep;	(* any expressions used by this statement *)
		nlines: integer;
		bpt: boolean;
		case stype: stmntypes of

    progtype:	    (pcode: statementp; errors: integer);
    blocktype,
    declaretype,
    endtype,
    coendtype:	    (bcode, bparent: statementp; blkid: identp;
			level, numvars: 0..255; variables: varidefp);
    aborttype:	    (plist: nodep; debugLev: integer);
    cmtype:	    (oncond: nodep; conclusion: statementp;
			deferCm, exprCm: boolean; cdef: varidefp);
		end;

(* auxiliary definitions: variable, etc. *)

varidef = packed record
	    next,dnext: varidefp;
	    name: identp;
	    level: 0..255;	(* environment level *)
	    offset: 0..255;	(* environment offset *)
	    dtype: varidefp;	(* to hold the dimension info *)
	    tbits: 0..15;  (* special type bits: array = 1, proc = 2, ref = 4 & ? *)
	    dbits: 0..15;	(* for use by debugger/interpreter *)
	    case vtype: datatypes of
  arraytype:  (a: nodep);
  proctype:   (p: nodep);
  labeltype,
  cmontype:   (s: statementp);
  mactype:    (mdef: statementp);
  macargtype: (marg: tokenp);
  pconstype:  (c: nodep);
  dimensiontype: (dim: nodep);
	  end;

(* definition of the ubiquitous NODE record *)

nodetypes = (exprnode, leafnode, listnode, clistnode, colistnode, forvalnode,
		deprnode, viaptnode, apprnode, destnode, durnode,
		sfacnode, wobblenode, swtnode, nullingnode, wristnode, cwnode,
		arrivalnode, departingnode,
		ffnode, forcenode, stiffnode, gathernode, cmonnode, errornode,
		calcnode, arraydefnode, bnddefnode, bndvalnode,
		waitlistnode, procdefnode, tlistnode, dimnode, commentnode);

exprtypes =  (	svalop,					(* scalar operators *)
		sltop, sleop, seqop, sgeop, sgtop, sneop,	(* relations *)
		notop, orop, xorop, andop, eqvop,		(* logical *)
		saddop, ssubop, smulop, sdivop, snegop, sabsop, (* scalar ops *)
		sexpop, maxop, minop, intop, idivop, modop,
		sqrtop, logop, expop, timeop,			(* functions *)
		sinop, cosop, tanop, asinop, acosop, atan2op,	(* trig *)
		vdotop, vmagnop, tmagnop,
		vecop,					(* vector operators *)
		vmakeop, unitvop, vaddop, vsubop, crossvop, vnegop,
		svmulop, vsmulop, vsdivop, tvmulop, wrtop,
		tposop, taxisop,
		transop,				(* trans operators *)
		tmakeop, torientop, ttmulop, tvaddop, tvsubop, tinvrtop,
		vsaxwrop, constrop, ftofop, deproachop, fmakeop, vmkfrcop,
		ioop,					(* i/o operators *)
		queryop, inscalarop,
		specop,					(* special operators *)
		arefop, callop, grinchop, macroop, vmop, adcop, dacop,
		badop,
		addop, subop, negop, mulop, divop, absop); (* for parsing *)

leaftypes = pconstype..strngtype;

reltypes = sltop..sgtop;
forcetypes = (force,absforce,torque,abstorque,angvelocity);

node = record
	next: nodep;
	case ntype: nodetypes of
    exprnode:	(op: exprtypes; arg1, arg2, arg3: nodep; elength: integer);
    leafnode:	(case ltype: leaftypes of
	varitype:  (vari: varidefp; vid: identp);
	pconstype: (cname: varidefp; pcval: nodep);
	svaltype:  (s: scalar; wid: integer);
	vectype:   (v: dump);
	transtype: (t: dump);
	strngtype: (length: integer; str: strngp) ); (* also used by commentnodes *)
    errornode:	(eexpr: nodep);
    bnddefnode:	(lower, upper: nodep);
    waitlistnode: (who: pdbp; when: integer);
    procdefnode:(ptype: datatypes; level: 0..255;
		    pname, paramlist: varidefp; body: statementp);
	end;

(* records for parser: ident, token, resword *)

ident = record
	    next: identp;
	    length: integer;
	    name: strngp;
	    predefined: varidefp;
	  end;


tokentypes = (reswdtype, identtype, constype, comnttype, delimtype, labeldeftype,
		macpartype);

constypes = svaltype..strngtype;

reswdtypes = (stmnttype, filtype, clsetype, decltype, optype, edittype);

filtypes = (abouttype,alongtype,attype,bytype,defertype,dotype,elsetype,
		errmodestype,fromtype,handtype,intype,nonrigidlytype,rigidlytype,
		sourcefiletype,steptype,thentype,totype,untltype,viatype,
		withtype,worldtype,zeroedtype,oftype,wheretype,nowaittype,
		ontype,offtype,ppsizetype,collecttype,alltype,lextype);

clsetypes = (approachtype,arrivaltype,departuretype,departingtype,durationtype,
		errortype,forcetype,forceframetype,forcewristtype,gathertype,
		nildeproachtype,nonullingtype,nullingtype,stiffnesstype,
		torquetype,velocitytype,wobbletype,
		cwtype,ccwtype,stopwaittimetype,angularvelocitytype,
		fxtype,fytype,fztype,mxtype,mytype,mztype,
		t1type,t2type,t3type,t4type,t5type,t6type,tbltype);

edittypes = (getcmd,savecmd,insertcmd,renamecmd,startcmd,gocmd,proceedcmd,
		stepcmd,sstepcmd,nstepcmd,gstepcmd,executecmd,setcmd,tracecmd,
		breakcmd,unbreakcmd,tbreakcmd,definecmd,markcmd,unmarkcmd,
		popcmd);

token = record
	  next: tokenp;
	  case ttype: tokentypes of
constype:   (cons: nodep);
comnttype:  (len: integer; str: strngp);
delimtype:  (ch: ascii);
reswdtype:  (case rtype: reswdtypes of
	stmnttype: (stmnt: stmntypes);
	filtype:   (filler: filtypes);
	clsetype:  (clause: clsetypes);
	decltype:  (decl: datatypes);
	optype:	   (op: exprtypes);
	edittype:  (ed: edittypes) );
identtype:  (id: identp);
labeldeftype: (lab: varidefp);
macpartype: (mpar: varidefp);
	end;


resword = record
	  next: reswordp;
	  length: integer;
	  name: strngp;
	  case rtype: reswdtypes of
	stmnttype:  (stmnt: stmntypes);
	filtype:    (filler: filtypes);
	clsetype:   (clause: clsetypes);
	decltype:   (decl: datatypes);
	optype:	    (op: exprtypes);
	edittype:  (ed: edittypes);
	  end;

(* process descriptor blocks & environment record definitions *)

queuetypes = (nullqueue,nowrunning,runqueue,inputqueue,eventqueue,sleepqueue,
		forcewait,devicewait,joinwait,proccall);

pdb = packed record
	nextpdb,next: pdbp;	(* for list of all/active pdb's *)
	level: 0..255;		(* lexical level *)
	mode: 0..255;		(* expression/statement/sub-statement *)
	priority: 0..255;
	status: queuetypes;	(* what are we doing *)
	env: envheaderp;
	spc: statementp;	(* current statement *)
	epc: nodep;		(* current expression (if any) *)
	sp: nodep;		(* intermediate value stack *)
	cm: cmoncbp;		(* if we're a cmon point to our definition *)
	mech: dump;		(* current device being used *)
	linenum: integer;	(* used by editor/debugger *)
	 case procp: boolean of	(* true if we're a procedure *)
true:  (opdb: pdbp;		(* pdb to restore when procedure exits *)
	pdef: nodep);		(* procedure definition node *)
false: (evt: dump;		(* event to signal when process goes away *)
	sdef: statementp);	(* first statement where process was defined *)
      end;


envheader = packed record
	      parent: envheaderp;
	      env: array [0..4] of environp;
	      varcnt: 0..255;		(* # of variables in use ??? *)
		case procp: boolean of  (* true if we're a procedure *)
	true: (proc: nodep);
	false:(block: statementp);
	    end;


enventry = record
	    case etype: datatypes of
  svaltype:  (s: scalar);
  vectype:   (v: dump);
  transtype: (t: dump);
  frametype: (f: dump);
  eventtype: (evt: dump);
  strngtype: (length: integer; str: strngp);
  cmontype:  (c: cmoncbp);
  proctype:  (p: nodep; penv: envheaderp);
  reftype:   (r: enventryp);
  arraytype: (a: envheaderp; bnds: nodep);
	   end;


environment = record
		next: environp;
		vals: array [0..9] of enventryp;
	      end;


cmoncb = record
	   running, enabled: boolean;		(* cmon's status *)
	   cmon: statementp;
	   pdb: pdbp;
	   evt: dump;
	   fbits: integer;			(* bits for force sensing *)
	   oldcmon: cmoncbp;			(* for debugger *)
	 end;

(* print related records: *)

cursorp = record
	  cline,ind: integer;
	  case stmntp: boolean of
  true:    (st: statementp);
  false:   (nd: nodep);
	 end;

linerec = record
	next: linerecp;
	start,length: integer
       end;

listingarray = packed array [0..listinglength] of ascii;

(* Global variables *)

var 
	(* From ALMAIN *)
    b:boolean;		
    ch:ascii;
    ltime: real;

	(* From PARSE *)
    reswords: array [0..26] of reswordp;
    idents: array [0..26] of identp;
    macrostack: array [1..10] of tokenp;
    curmacstack: array [1..10] of varidefp;
    macrodepth: integer;
    curchar, maxchar, curline: integer;
    curBlock,newDeclarations: statementp;
    curProc: varidefp;
    pnode: nodep;
    nodim, distancedim, timedim, angledim,
      forcedim, torquedim, veldim, angveldim: varidefp;
    fvstiffdim, mvstiffdim: nodep;
(*  filedepth: integer;
    curpage: integer;
    sysVars,unVars: varidefp;
    errcount: integer;
    outerBlock: statementp;
    curVariable: varidefp;
    curMotion: statementp;
    endOk,coendOk: integer;
    moveLevel: integer;
    curErrhandler, curCmon: statementp;	*)
    d1: array[1..13] of dump;
    endOfLine, backup, expandmacros, flushcomments, dimCheck: boolean;
(*  semiseen, shownline: boolean;
    eofError: boolean;
    inMove,inCoblock: boolean;	*)
    d2,d3,d4,d5,d6: boolean;
    curtoken: token;
    file1,file2,file3,file4,file5: atext;
    line: linestr;

	(* From INTERP *)
    curInt, activeInts, readQueue, allPdbs: pdbp;
    curEnv, sysEnv: envheaderp;
    clkQueue: nodep;
    allEvents: dump;
    STLevel: integer;		
    etime: integer;		
    curtime: integer; 		
    stime: integer;		
    msg: dump;			
    inputp: integer;	
    debugLevel: integer;
    tSingleThreadMode: boolean;
    resched, running, escapeI, singleThreadMode: boolean;
    msgp: boolean;		(* flag set if any messages pending *)
    inputReady: boolean;
    inputLine: array [1..20] of ascii;

	(* From EDIT *)
    lines: array [1..maxLines] of linerecp; 
    ppLines: array [1..maxPPLines] of linerecp;	
    marks: array [1..20] of integer;
    cursorStack: array [1..15] of cursorp;
    bpts: array [1..maxBpts] of statementp;
    tbpts: array [1..maxTBpts] of statementp;
    debugPdbs: array [0..10] of pdbp;
    screenheight,dispHeight: integer;
    ppBufp,oppBufp,ppOffset,ppSize,nmarks: integer;
    lbufp,cursor,ocur,cursorLine,fieldnum,lineNum,findLine,pcLine: integer;
    firstDline,topDline,botDline,firstLine,lastLine: integer;
    freeLines,oldLines: linerecp;
    findStmnt: statementp;
    nbpts,ntbpts: integer;
    eCurInt: pdbp;
    dProg: statementp;	
    smartTerminal: boolean; 
    setUp,setExpr,setCursor,dontPrint,outFilep,newVarOk,collect: boolean;
    eBackup: boolean;			
    eSingleThreadMode: boolean;	
    listing: packed array [0..listinglength] of ascii;
    lbuf: array [1..160] of ascii;
    ppBuf: array [1..100] of ascii;
    outFile: atext;
    eCurToken: token;			

	(* Various device & variable pointers *)
    speedfactor: enventryp;
    barm: dump;

	(* Various constant pointers *)
    xhat,yhat,zhat,nilvect: dump;
    niltrans: dump;
    bpark, ypark, gpark, rpark: dump;		(* arm park positions *)

{ Externally defined routines from elsewhere: }

	(* From CALLER *)
procedure e3aFlushAll(p: pdbp; dLev: integer);			external;
function e3aParse(fname: c20str; ppn: integer): statementp;	external;

	(* From FREE *)
procedure freeStatement(s: statementp);				external;

	(* From IAUX1B *)
procedure swap(newp: pdbp);					external;

	(* From PAUX2 *)
procedure relExpr(n: nodep);					external;

	(* From EAUX1A *)
procedure out1Line(line,start,length: integer); 		external;
procedure clearLine(i: integer);				external;
function eUpperCase(c: ascii): ascii;				external;
procedure borderLines;						external;
procedure adjustDisplay;					external;

	(* From ETOKEN *)
procedure eGetToken;						external;

	(* From EAUX2A *)
procedure initOuterBlock (which:integer);			external;

	(* From EAUX2C *)
procedure displayLines(var pfrom: integer);			external;

	(* From EPUTST *)
procedure putstmnt(s: statementp; indent, plevel: integer);	external;

	(* From PP *)
procedure relLine(l: linerecp);					external;
procedure ppLine; 						external;
procedure ppOutNow; 						external;
procedure ppChar(ch: ascii); 					external;
procedure pp5(ch: c5str; length: integer); 			external;
procedure pp10(ch: cstring; length: integer); 			external;
procedure pp10L(ch: cstring; length: integer);			external;
procedure pp20(ch: c20str; length: integer); 			external;
procedure pp20L(ch: c20str; length: integer); 			external;
procedure ppInt(i: integer); 					external;


procedure eAux3aGet; external;
procedure eAux3aGet;  begin end;

(* aux routines: setPPSize, flushOldEnvironments, saveOutermostEnv *)

procedure setPPSize(arg: integer); external;
procedure setPPSize;
 var delta,i,j,top,bot: integer;
 begin				(* set page printer size to arg *)
 if arg < 3 then arg := 3	(* make sure it's a reasonable request *)
  else if arg > screenHeight - 5 then arg := screenHeight - 5;
 if arg > maxPPlines then arg := maxPPlines;
 delta := arg - ppSize;
 if delta > 0 then
   begin				(* increase page printer size *)
   ppOffset := ppOffset + delta;
   dispHeight := dispHeight - delta;
   adjustDisplay;			(* make sure cursor stays on screen *)
   displayLines(lineNum);		(* shift display if necessary *)
   for i := ppSize downto 1 do ppLines[i+delta] := ppLines[i];
   for i := 1 to delta do 
    begin
    ppLines[i] := nil;			(* we'll roll up later *)
    clearLine(dispHeight + 1 + i);
    end;
   end
  else if delta < 0 then
   begin				(* decrease page printer size *)
   delta := - delta;
   ppOffset := arg;
   for i := 1 to delta do relLine(ppLines[i]);
   for i := 1 to arg do ppLines[i] := ppLines[delta + i];
   for i := arg + 1 to ppSize do ppLines[i] := nil;
   for i := 1 to delta do clearLine(dispHeight + 1 + i);
   top := topDline + firstDline + dispHeight - 1;  (* top line being added *)
   bot := top + delta - 1;			(* last line to add *)
   if bot <= botDline then j := bot else j := botDline;
   for i := top to j do			(* show lines already in display *)
    with lines[i-topDline+1]↑ do
     out1Line(i-topDline-firstDline+2,start,length);
   dispHeight := dispHeight + delta;
   if j < bot then displayLines(lineNum)	(* add new lines *)
    else borderLines;
   end;
 ppSize := arg;
 end;

procedure flushOldEnvironments(dLev: integer); external;
procedure flushOldEnvironments;
 var i: integer; p: pdbp;
 begin			(* tell INTERP to flush old program environment *)
 for i := debugLevel downto dLev do
  begin
  if i > 0 then
    begin
    p := debugPdbs[i];
    while p <> nil do
     with p↑ do
      begin
      if sdef↑.last = nil then 		(* free immediate stmnt & it's abort *)
	begin freeStatement(sdef↑.next); freeStatement(sdef) end
       else
	with sdef↑.next↑ do
	 if (stype = aborttype) and (debugLev >= i) then
	   begin
	   last↑.next := next;
	   next↑.last := last;
	   freeStatement(sdef↑.next);		(* flush pseudo-abort *)
	   end;
      p := next;
      end;
    e3aFlushAll(debugPdbs[i],i);
    debugPdbs[i] := nil;
    end 
   else e3aFlushAll(nil,0);
  end;
 if tSingleThreadMode and (STLevel >= dLev) then
   begin
   STLevel := 0;
   tSingleThreadMode := false;
   if not esingleThreadMode then singleThreadMode := false;
   end;
 if dLev > 0 then debugLevel := dlev - 1 else debugLevel := 0;
 if curInt = nil then swap(nil);	(* see if anyone's active *)
 eCurInt := curInt;
 if eCurInt <> nil then pcLine := eCurInt↑.linenum;
 end;

procedure saveOutermostEnv; external;
procedure saveOutermostEnv;
 var menv: envheaderp;
 begin
 with debugPdbs[0]↑ do			(* use main process pdb *)
  begin
  menv := env;				(* save outermost environment *)
  level := 2;				(* so flushAll won't clobber it *)
  end;
 while menv↑.parent↑.parent <> nil do
  menv := menv↑.parent;			(* up to outermost environment *)
 flushOldEnvironments(0);
 esingleThreadMode := false;		(* reset single thread (nowait) mode)
 eCurInt := curInt;			(* get new main process pdb *)
 debugPdbs[0] := eCurInt;
 with eCurInt↑ do
  begin
  spc := dprog↑.pcode↑.bcode;
  env := menv;				(* restore old environment *)
  sdef := dprog;
  linenum := 2;
  end;
 pcLine := 2;
 end;

(* Aux routine: setUpStmnt *)

procedure setUpStmnt(which: integer); external;
procedure setUpStmnt;
 var i: integer;
 begin
 lbufp := 0;
 cursor := 0;
 fieldNum := 1; 
 firstLine := 0;
 lastLine := 0;
 curLine := 0;
 cursorLine := 1;
 setCursor := false;
 setUp := true;
 setExpr := false;
 dontPrint := false;
 outFilep := false;
 findStmnt := nil;
 curProc := nil;
 pcLine := 1;
 putStmnt(dprog,0,99);	(* figure out how long each statement is *)
 setUp := false;
 topDline := 0;
 botDline := -1;
 firstDline := 1;
 for i := 1 to maxLines do
  if lines[i] <> nil then
   begin
   relLine(lines[i]);			(* free up any old lines *)
   lines[i] := nil;
   end;
 for i := 1 to 20 do marks[i] := 0;
 nmarks := 0;
 for i := 1 to maxBpts do bpts[i] := nil;
 for i := 1 to maxTBpts do tbpts[i] := nil;
 nbpts := 0;
 ntbpts := 0;
 debugLevel := 0;
 for i := 1 to 10 do debugPdbs[i] := nil;
 collect := false;
 esingleThreadMode := false;
 tSingleThreadMode := false;
 SingleThreadMode := false;
 initOuterBlock(which);
 end;

(* aux routines: fileParse, writeProg, readProg *)

procedure fileParse(var fname: c20str); external;
procedure fileParse;
 var ip,i,j,k,prj,prg: integer; ch: char; b: boolean;

 function nextchar: char;
  begin
  if i <= maxChar then nextchar := eUpperCase(listing[i])
   else nextchar := ' ';
  i := i + 1;
  end;

 begin (* fileParse *)	(* A stripped down version for the 11 *)
 fname[1] := ' ';
 i := curChar;
 k := maxChar + 1;
 ip := 1;
 repeat 				(* Skip spaces *)
  ch := nextchar 
 until (ch <> ' ') or (i >= k);	
 b := true;
 while (ch <> ' ') and b do
  begin						(* parse file name *)
  if ip <= 20 then begin fname[ip] := ch; ip := ip + 1 end
   else 
    begin pp20L('Bad file name       ',13); ppLine; 
    b := false;
    end;
  ch := nextchar;
  end;
 for j := ip to 20 do fname[j] := ' ';		(* Space-fill the rest *)
 end;

procedure writeProg; external;
procedure writeProg;
 var i: integer; filnam: c20str; 
 begin
 fileParse(filnam);
 if filnam[1] = ' ' then
   begin pp20L('Need a name for file',20); ppLine end
  else
   begin
   rewrite(outFile,filnam,'.AL');		(* open file for output *)
   outFilep := true;
   firstLine := 0;
   lastLine := dprog↑.nlines + 1;
   curLine := 0;
   putStmnt(dprog,0,99);			(* write program out *)
   outFilep := false;
   break(outFile);	(* Maybe this will write out the stuff at the end.. *)
   close(outFile);				(* close file *)
   end;
 end;

procedure readProg; external;
procedure readProg;
 var i: integer; filename: c20str; b: boolean;
 begin
 fileParse(filename);
 if filename[1] = ' ' then
   begin pp20L('Need a name of file ',19); ppLine end
  else
   begin
   reset(outFile,filename,'.AL',i);		(* see if file exists *)
   b := (i < 0);				(* does it? *)
   reset(outFile);				(* that's all we needed it for *)
   if b then
     begin pp20L('File not found      ',15); ppLine end
    else
     begin
     flushOldEnvironments(0);
     freeStatement(dprog);			(* release old program *)
     i := ppSize;
     setPPSize(55);				(* use max pp size *)
     dprog := e3aParse(filename,0);		(* read in new program *)
     setUpStmnt(1);		(* Call setUpStmnt and tell it readProg called it *)
     setCursor := true;
     cursorLine := 2;
     lineNum := 1;
     topDline := 0;
     botDline := 0;
     displayLines(lineNum);			(* show first window *)
     setPPSize(i);
     end
   end
 end;

(* Aux routines called by edit: getEcmd, doSetCmd *)

procedure getEcmd; external;
procedure getEcmd;
 begin
 eGetToken;			(* see what user wants us to do *)
 with eCurToken do
  if ttype = reswdtype then		(* may need to change to edit context *)
    if rtype = stmnttype then
      begin
      if stmnt = definetype then
	begin rtype := edittype; ed := definecmd end
       else if stmnt = cmtype then
	begin rtype := filtype; filler := ontype end
      end
     else if (rtype = filtype) and (filler = steptype) then
      begin rtype := edittype; ed := stepcmd end
 end;

procedure doSetcmd;	 external;
procedure doSetcmd;	
 var svar: filtypes; b,onoff: boolean; arg: integer;

 function getNumericArg(default: integer): boolean;
  var b: boolean;
  begin
  with eCurToken do
   begin
   if ttype = constype then b := cons↑.ltype = svaltype
    else b := false;
   if b then arg := round(cons↑.s)		(* use specified argument *)
    else if endOfLine then 
     begin arg := default; b := true end	(* use default value *)
    else begin pp20L('Need a numeric arg  ',18); ppLine; end;
   end;
  getNumericArg := b;
  end;

 function getOnOff(default: boolean): boolean;
  var b: boolean;
  begin
  with eCurToken do
   begin
   b := (ttype = reswdtype) and (rtype = filtype) and
	((filler = ontype) or (filler = offtype));
   if b then onoff := filler = ontype
    else if endOfLine then
     begin onoff := default; b := true end	(* use default value *)
    else begin pp20L('Expecting ON or OFF ',19); ppLine; end;
   end;
  getOnOff := b;
  end;

 begin (* doSetCmd *)
 getEcmd;				(* see what we're setting *)
 with eCurToken do
  begin
  arg := 1;
  if (ttype = reswdtype) and (rtype = filtype) then svar := filler
   else if (ttype = reswdtype) and (rtype = stmnttype) and 
	   (stmnt = waittype) then begin svar := nowaittype; arg := -1 end
   else svar := defertype;		(* no good *)
  getEcmd;				(* see what we're setting it to *)
  case svar of
ppsizetype:   begin
	     b := getNumericArg(3);		(* default size is 3 *)
	     if b then setPPSize(arg);		(* set page printer size *)
	     end;
collecttype:  begin	(* see if we're collecting stmnts typed to interpreter *)
	     b := getOnOff(true);		(* default is collect *)
	     if b then collect := onoff;	(* set whether to collect *)
	     borderLines;			(* Redraw top line to show flag *)
	     end;
lextype:      begin
	     b := getNumericArg(1);		(* default is up one level *)
	     if b then 
	       begin (* *** ??? what do we do ??? *** *) end;
	     end;
nowaittype:   begin	(* arg = 1 for nowait, -1 for wait *)
	     b := getOnOff(true);
	     if arg < 0 then onoff := not onoff;
	     if b then
	       begin
	       eSingleThreadMode := onoff;
	       if (debugLevel < STLevel) or not tSingleThreadMode then
		 singleThreadMode := onoff;
	       end;
	     borderLines;			(* Redraw top line to show flag *)
	     end;
otherwise     begin pp20L('Bad SET request     ',15); ppLine end;
    end;
  if ttype = constype then relExpr(cons);
  end 
 end (* doSetCmd *);