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gapparse.g
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gapparse.g
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# GAP parser
GAPPARSE:="version 0.1, 7/1/19"; # version number
# (C) Alexander Hulpke
LINEWIDTH:=80;
COMMENTWIDTH:=LINEWIDTH-3;
TOKENS:=[ "and", "do", "elif", "else", "end", "fi", "for", "function",
"if", "in", "locval", "mod", "not", "od", "or", "repeat","local","rec",
"return", "then", "until", "while", "break", "rec", "continue",
":=",",","\"","(",")","[","]","{","}",";","<>","<",">","=","<=",">=",
"->","!.","![",".","..","%%%"];
# binary operators
BINOPS:=["+","-","*","/","^","div","mod","in",".","!.","->","=","<>",
"<=",">=","<",">","and","or"];
PAROP:=["+","-","div","mod","in"];
OPRECED:=[".","@","@@","![","!.",
"^", "*", "/", "div", "mod", "+", "-",
"not", "and", "or", "=", "<>","<=",">=","<",">",":=", "->","in"];
DOTPREF:=["FindHomMethodsProjective","SLCR","RECOG"]; # make records a.b identifier names
TOKENS:=Union(TOKENS,BINOPS);
TOKENS:=Union(TOKENS,PAROP);
# parses to the following units:
# co commentary
# B* binary operation *
# C function call
# <> substructure constructor
# L list indexing
# I identifier
# V vector
# & reduction operator
# U* unary operation *
# N number
# F function definition
# if conditional
# return
# : [op: a in l] operation
# R range [from..to]
#perm
UnFlat:=function(m)
local n;
n:=RootInt(Length(m),2);
if n^2<>Length(m) then
return fail;
fi;
return List([1..n],x->m{[1+n*(x-1)..n*x]});
end;
UnpackNumberList:=function(l)
local m,i;
m:=[];
for i in l do
if not IsRecord(i) then
Add(m,i);
elif i.type="N" then
Add(m,i.name);
elif i.type="U-" and i.arg.type="N" then
Add(m,-i.arg.name);
else
return fail;
fi;
od;
return m;
end;
FILEPRINTSTR:="";
START:="";
FilePrint:=function(arg)
local f,i,p,a,new;
f:=arg[1];
for i in [2..Length(arg)] do
if not IsString(arg[i]) then
new:=String(arg[i]);
if ValueOption("noblank")=true then
new:=Filtered(new,x->x<>' ');
fi;
else
new:=arg[i];
fi;
FILEPRINTSTR:=Concatenation(FILEPRINTSTR,new);
p:=Position(FILEPRINTSTR,'\b');
while p<>fail do
FILEPRINTSTR:=Concatenation(FILEPRINTSTR{[1..p-2]},FILEPRINTSTR{[p+1..Length(FILEPRINTSTR)]});
p:=Position(FILEPRINTSTR,'\b');
od;
p:=Position(FILEPRINTSTR,'\n');
while p<>fail do
if p>LINEWIDTH then
# try to find better break point
a:=p;
p:=LINEWIDTH;
while p>0 and not FILEPRINTSTR[p] in "]) " do
p:=p-1;
od;
if p=0 or ForAll([1..p],x->FILEPRINTSTR[x]=' ') then
p:=a;
p:=LINEWIDTH;
while p>0 and not FILEPRINTSTR[p] in "," do
p:=p-1;
od;
if p=0 then
p:=a;
fi;
fi;
AppendTo(f,FILEPRINTSTR{[1..p]},"\n");
FILEPRINTSTR:=Concatenation(START," ",FILEPRINTSTR{[p+1..Length(FILEPRINTSTR)]});
else
AppendTo(f,FILEPRINTSTR{[1..p]});
FILEPRINTSTR:=FILEPRINTSTR{[p+1..Length(FILEPRINTSTR)]};
fi;
p:=Position(FILEPRINTSTR,'\n');
od;
od;
end;
CHARSIDS:=Concatenation(CHARS_DIGITS,CHARS_UALPHA,CHARS_LALPHA,"_");
CHARSOPS:="+-*/,;:=~!";
GapParse:=function(file)
local Comment,eatblank,gimme,ReadID,ReadOP,ReadExpression,ReadBlock,
ExpectToken,doselect,costack,locals,globvars,globimp,defines,problemarea,
f,l,lines,linum,w,a,idslist,tok,tnum,i,sel,osel,e,comment,forward,
thisfctname,cmdstack,ProcessWhere,IsAtToken,ReadOptions,makeprintlistnice;
locals:=[];
globvars:=[];
globimp:=[];
defines:=[];
forward:=[];
# print current area (as being problematic)
problemarea:=function(arg)
local a,l,s;
if Length(arg)=0 then a:=10;else a:=arg[1];fi;
Print("\c\n\n");
l:=0;
for i in [Maximum(1,tnum-200)..tnum-a-1] do
s:=tok[i][2];
if not IsString(s) then
s:=String(s);
fi;
l:=l+Length(s);
if l>78 then
Print("\n");
l:=Length(s);
fi;
Print(s);
od;
Print("\n");
Print(tok{[Maximum(1,tnum-a)..tnum-1]},"\n------\n",tok{[tnum..tnum+a]},"\n");
l:=0;
for i in [tnum+a+1..Minimum(Length(tok),tnum+50)] do
s:=tok[i][2];
if not IsString(s) then
s:=String(s);
fi;
l:=l+Length(s);
if l>78 then
Print("\n");
l:=Length(s);
fi;
Print(s);
od;
Print("\n");
end;
eatblank:=function()
while Length(l)>0 and (l[1]=' ' or l[1]='\t') do
l:=l{[2..Length(l)]};
od;
while Length(l)>0 and l[Length(l)]=' ' do
l:=l{[1..Length(l)-1]};
od;
end;
# read file
f:=InputTextFile(file);
lines:=[];
while not IsEndOfStream(f) do
l:=ReadLine(f);
if l<>fail then
l:=Chomp(l);
eatblank();
Add(lines,l);
fi;
od;
CloseStream(f);
comment:=[];
gimme:=function()
local a,b,p;
while Length(l)<80 and linum<Length(lines) do
linum:=linum+1;
a:=lines[linum];
# comment?
if Length(a)>=1 and PositionSublist(a,"#")<>fail then
p:=PositionSublist(a,"#");
l:=Concatenation(l," ",a{[1..p-1]});
eatblank();
a:=a{[p+2..Length(a)]};
# 1-line comment
Add(comment,a);
a:="%%%";
fi;
l:=Concatenation(l," ",a);
#if PositionSublist(l,"two_power")<>fail then Error("ZUGU");fi;
od;
eatblank();
end;
IsAtToken:=function(str)
return tok[tnum][2]=str and tok[tnum][1]<>"S";
end;
ExpectToken:=function(arg)
local s,o,i,a;
s:=arg[1];
if Length(arg)>1 then
o:=arg[2];
else
o:="";
fi;
if tok[tnum][2]<>s then Error("expect ",s," but got ",tok[tnum]);fi;
# deal with infix comments before token
i:=tnum;
while tok[i][1]="#" do
i:=i+1;
od;
if s<>"#" and i>tnum then
a:=tok[i];
while i>tnum do
tok[i]:=tok[i-1];
i:=i-1;
od;
tok[tnum]:=a;
fi;
tnum:=tnum+1;
#Print("I'm at:"); problemarea(); Print("\n");
end;
# tokenize, deal with comments and strings
tok:=[];
linum:=0;
l:="";
gimme();
while linum<=Length(lines) and Length(l)>0 do
gimme();
if l[1] in CHARSIDS then
i:=1;
# a word-like identifier
while l[i] in CHARSIDS or (l[i]='.' and l{[1..i-1]} in DOTPREF) do
i:=i+1;
od;
a:=l{[1..i-1]};
l:=l{[i..Length(l)]};eatblank();
i:=Position(TOKENS,a);
if i=fail then
if ForAll(a,x->x in CHARS_DIGITS) then
Add(tok,["N",Int(a)]);
else
Add(tok,["I",a]);
fi;
# now in K territory
elif TOKENS[i]="cat" and l{[1,2]}=":=" then
# fix cat:=
a:=Concatenation(a,l{[1,2]});
l:=l{[3..Length(l)]};
eatblank();
i:=Position(TOKENS,a);
Add(tok,["O",TOKENS[i]]);
elif a="is" then
Add(tok,["O",":="]);
else
Add(tok,["K",TOKENS[i]]);
fi;
else
sel:=[1..Length(TOKENS)];
i:=0;
repeat
i:=i+1;
osel:=sel;
sel:=Filtered(sel,x->Length(TOKENS[x])>=i and TOKENS[x][i]=l[i]);
until Length(sel)=0;
osel:=Filtered(osel,x->Length(TOKENS[x])=i-1);
if Length(osel)>1 then
Error("nonunique");
elif Length(osel)=0 then
# no token fits -- use as identifier
i:=Maximum(2,i);
Add(tok,["I",l{[1..i-1]}]);
else
if l{[1..i-1]}<>TOKENS[osel[1]] then Error("token error");fi;
a:=TOKENS[osel[1]];
if a="%%%" then # this is where the comment should go
Add(tok,["\043",comment[1]]);
comment:=comment{[2..Length(comment)]};
elif a="\"" then
# string token
l:=l{[i..Length(l)]};
gimme();
i:=1;
while l[i]<>'"' or (i>1 and l[i-1]='\\') do
i:=i+1;
od;
Add(tok,["S",l{[1..i-1]}]);
i:=i+1;
else
Add(tok,["O",a]);
fi;
fi;
l:=l{[i..Length(l)]};eatblank();
fi;
od;
ReadBlock:=function(endkey)
local l,e,a,aif,b,c,d,f,locals,kind,i;
l:=[];
locals:=[];
while tnum<=Length(tok) and
(endkey=false or ForAll(endkey,x->tok[tnum]<>["K",x])) do
if Length(costack)>0 then
for e in costack do
Add(l,rec(type:="co",text:=e[2]));
od;
costack:=[];
fi;
e:=tok[tnum];
tnum:=tnum+1;
if e[1]="#" then
Add(l,rec(type:="co",text:=e[2]));
elif e[1]="K" then
# keyword
if e[2]="if" then
a:=ReadExpression(["then",";"]);
if IsAtToken("then") then
ExpectToken("then");
else
Error("confused if");
fi;
b:=ReadBlock(["else","fi","elif"]:inner);
locals:=Union(locals,b[1]);
a:=rec(type:="if",cond:=a,block:=b[2]);
Add(l,a);
while IsAtToken("elif") do
ExpectToken("elif");
c:=ReadExpression(["then"]);
ExpectToken("then");
b:=ReadBlock(["else","fi","elif"]:inner);
locals:=Union(locals,b[1]);
a.elseblock:=[rec(type:="if",isElif:=true,cond:=c,block:=b[2])];
a:=a.elseblock[1]; # make elif an iterated else if
od;
if IsAtToken("else") then
ExpectToken("else");
b:=ReadBlock(["fi"]:inner);
locals:=Union(locals,b[1]);
a.elseblock:=b[2];
fi;
ExpectToken("fi");
ExpectToken(";",1);
elif e[2]="while" then
a:=ReadExpression(["do"]);
ExpectToken("do");
b:=ReadBlock(["od"]:inner);
locals:=Union(locals,b[1]);
a:=rec(type:="while",cond:=a,block:=b[2]);
ExpectToken("od");
ExpectToken(";",2);
Add(l,a);
elif e[2]="for" then
a:=rec(type:="I",name:=tok[tnum][2]);
tnum:=tnum+1;
if IsAtToken("in") then
ExpectToken("in");
c:=ReadExpression(["do"]);
else
Error("wrong for loop");
fi;
ExpectToken("do");
b:=ReadBlock(["od"]:inner);
locals:=Union(locals,b[1]);
AddSet(locals,a.name);
a:=rec(type:="for",var:=a,from:=c,block:=b[2]);
ExpectToken("od");
ExpectToken(";",3);
Add(l,a);
elif e[2]="repeat" then
b:=ReadBlock(["until"]);
ExpectToken("until");
locals:=Union(locals,b[1]);
a:=ReadExpression([";"]);
a:=rec(type:="repeat",cond:=a,block:=b[2]);
Add(l,a);
ExpectToken(";",5);
elif e[2]="return" then
a:=[];
b:=ReadExpression([";"]);
Add(a,b);
ExpectToken(";",6);
Add(l,rec(type:="return",values:=a));
elif e[2]="continue" then
ExpectToken(";",-8);
Add(l,rec(type:="continue"));
elif e[2]="local" then
c:=[];
repeat
a:=ReadExpression([",",";"]);
Add(c,a);
if IsAtToken(",") then
ExpectToken(",");
else
a:=fail;
fi;
until a=fail;
ExpectToken(";",11);
for a in c do
AddSet(locals,a.name);
od;
elif e[2]="break" then
a:=ReadExpression([";"]);
Add(l,rec(type:="break",var:=a));
ExpectToken(";",11/3);
else
problemarea();
Error("other keyword ",e);
fi;
elif e[1]="I" or e[2]="$$" then
e:=[e[1],e[2]];
tnum:=tnum-1;
if e[2]="$$" then tok[tnum]:=["I",thisfctname]; fi;
a:=ReadExpression([":=",";"]);
if a.type="I" then
AddSet(locals,a.name);
fi;
e:=tok[tnum];
tnum:=tnum+1;
if e[1]<>"O" then
problemarea();
Error("missing separator");
fi;
c:=fail;
if e[2]=":=" then
# assignment
b:=ReadExpression([";"]);
a:=rec(type:="A",left:=a,right:=b);
Add(l,a);
ExpectToken(";",14);
if endkey=false and IsBound(a.left.name) then
# top-level assignment -- global variable
#Print("> ",a.left.name," <\n");
AddSet(defines,a.left.name);
fi;
elif e[2]=";" then
a.line:=true; # only command in line
Add(l,a);
else
problemarea();
Error("anders");
fi;
elif e[2]=";" then
# empty command?
else
problemarea();
Error("cannot deal with token ",e);
fi;
od;
return [locals,l];
end;
# read identifier, call, function
ReadExpression:=function(stops)
local obj,e,a,b,c,argus,procidf,doprocidf,op,assg,val,pre,lbinops,
fcomment,stack,locopt;
lbinops:=Difference(BINOPS,stops);
procidf:=function()
local a,b;
a:=doprocidf();
while not "[" in stops and IsAtToken("[") do
ExpectToken("[");
# postfacto indexing
b:=ReadExpression(["]",","]);
if IsAtToken(",") then
# array indexing -- translate to iterated index by opening a parenthesis and keeping
# position
tok[tnum]:=["O","["];
else
ExpectToken("]");
fi;
a:=rec(type:="L",var:=a,at:=b);
od;
return a;
end;
doprocidf:=function()
local a,l,e,b,c,d,eset,open,close,ltype;
eset:=function()
while tok[tnum][1]="#" do
Add(costack,tok[tnum]);
tnum:=tnum+1;
od;
return tok[tnum][2];
end;
e:=eset();
a:=fail;
if tok[tnum][1]="S" then
tnum:=tnum+1;
return rec(type:="S",value:=e);
elif e in stops then
a:=rec(type:="none");
elif e="(" or e="\\(" then
#problemarea();Error("huh");
tnum:=tnum+1;
a:=ReadExpression([")",","]);
if IsAtToken(",") then
# pair, permutation
ExpectToken(",");
b:=ReadExpression([")",","]);
if IsAtToken(")") and tok[tnum+1][2]<>"(" then
# pair
ExpectToken(")");
a:=rec(type:="pair",left:=a,right:=b);
return a;
else
# permutation
b:=[a.name,b.name];
a:=();
repeat
while IsAtToken(",") do
ExpectToken(",",1);
e:=ReadExpression([")",","]);
Add(b,e.name);
od;
ExpectToken(")",1);
b:=MappingPermListList(b,Concatenation(b{[2..Length(b)]},b{[1]}));
a:=a*b;
if IsAtToken("(") then
ExpectToken("(");
# continue
b:=ReadExpression([")",","]);
b:=[b.name];
else
b:=fail;
fi;
until b=fail;
a:=rec(type:="perm",perm:=a);
return a;
fi;
fi;
ExpectToken(")");
return rec(type:="paren",arg:=a);
elif e="{" then
Error("sublist");
elif e="[" then
open:=e;
close:="]";
ltype:="V";
ExpectToken(open);
l:=[];
b:=fail;
if IsAtToken(close) then
#empty list
tnum:=tnum;
else
while not IsAtToken(close) or IsAtToken(".,") do
a:=ReadExpression([close,",",".."]);
if IsAtToken("..") then
ExpectToken("..");
e:=ReadExpression([close]); #part 2
if Length(l)=0 then
a:=rec(type:="R",from:=a,to:=e);
else
a:=rec(type:="R",from:=l[1],to:=e,second:=a);
fi;
ExpectToken(close);
return a;
elif IsAtToken(",") then
Add(l,a);
ExpectToken(",");
elif IsAtToken("close") then
Add(l,a);
fi;
od;
fi;
ExpectToken(close);
a:=rec(type:=ltype,args:=l);
if b<>fail then
a.force:=b;
fi;
elif not (tok[tnum][1] in ["I","N","S"] or e="$" or e="$$") then
tnum:=tnum+1;
if e in ["-","#"] then
a:=rec(type:=Concatenation("U",e),arg:=procidf());
elif e="+" then
# (spurious) +
a:=procidf();
elif e="&" then
while tok[tnum][1]="#" do
Add(costack,tok[tnum]);
tnum:=tnum+1;
od;
e:=eset();
tnum:=tnum+1;
a:=ReadExpression(Union([",",";"],stops));
a:=rec(type:="&",op:=e,arg:=a);
elif e="~" or e="not" or e="assigned" or e="eval" then
a:=ReadExpression(Concatenation(stops,["and","or"]));
a:=rec(type:=Concatenation("U",e),arg:=a);
elif e="select" then
Error("atselect");
elif e="rec" then
ExpectToken("(");
argus:=[];
while not IsAtToken(")") do
a:=ReadExpression([":=",")"]);
if IsAtToken(":=") then
ExpectToken(":=");
b:=ReadExpression([",",")"]);
Add(argus,[a,b]);
if IsAtToken(",") then ExpectToken(",");fi;
fi;
od;
ExpectToken(")");
a:=rec(type:="rec",components:=argus);
else
problemarea();
Error("other unary ",e);
fi;
else
if e="$$" then
tok[tnum]:=["I",thisfctname];
e:=thisfctname;
fi; # calling the current function
# identifier/number
if e="$" then
a:=rec(type:="I",name:="$");
else
a:=rec(type:=tok[tnum][1],name:=tok[tnum][2]);
fi;
tnum:=tnum+1;
e:=eset();
while not (e in stops or e in lbinops) do
if e="(" then
# function call
assg:=[];
tnum:=tnum+1;
argus:=[];
while (tok[tnum][1]="S" or tok[tnum][2]<>")") and tok[tnum][2]<>":" do
b:=ReadExpression([",",")",":"]);
Add(argus,b);
if IsAtToken(",") then
ExpectToken(",");
fi;
od;
if IsAtToken(":") then
ExpectToken(":");
while tok[tnum][2]<>")" do
Add(assg,ReadExpression([":=",")",","]));
if IsAtToken(":=") then
ExpectToken(":=");
Add(assg,ReadExpression([")",","]));
else
Add(assg,rec(type:="I",name:="true"));
fi;
if IsAtToken(",") then
ExpectToken(",");
fi;
od;
fi;
ExpectToken(")");
if a.type="I" and not a.name in locals then
AddSet(globvars,a.name);
fi;
a:=rec(type:="C",fct:=a,args:=argus);
if Length(assg)>0 then
a.type:="CA";
a.assg:=assg;
fi;
elif e="{" then
tnum:=tnum+1;
b:=ReadExpression(["}"]);
ExpectToken("}");
a:=rec(type:="SL",var:=a,at:=b);
elif e="[" or e="![" then
# index
tnum:=tnum+1;
b:=ReadExpression(["]",",",".."]);
if IsAtToken(",") then
# array indexing -- translate to iterated index by opening a parenthesis and keeping
# position
tok[tnum]:=["O","["];
a:=rec(type:="L",var:=a,at:=b);
elif IsAtToken("..") then
ExpectToken("..");
c:=ReadExpression(["]"]);
b:=rec(type:="R",from:=b,to:=c);
a:=rec(type:="LR",var:=a,at:=b);
ExpectToken("]");
else
ExpectToken("]");
a:=rec(type:="L",var:=a,at:=b);
fi;
elif e="<" then
pre:=a;
# <> structure
tnum:=tnum+1;
b:=[];
repeat
a:=ReadExpression(["|",","]);
Add(b,a);
if IsAtToken(",") then
ExpectToken(",");
else
a:=fail;
fi;
until a=fail;
ExpectToken("|");
c:=[];
repeat
a:=ReadExpression([",",">"]);
Add(c,a);
if IsAtToken(",") then
ExpectToken(",");
else
a:=fail;
fi;
until a=fail;
if IsAtToken(":") then
ExpectToken(":");
#make rest of assignment a comment
e:=tnum;
while tok[e][2]<>">" do
e:=e+1;
od;
tok:=Concatenation(tok{[1..tnum-1]},tok{[e]},
[["#",Concatenation(List(tok{[tnum..e-1]},x->String(x[2])))]],
tok{[e+1..Length(tok)]});
fi;
ExpectToken(">",5);
a:=rec(type:="<>",op:=pre,left:=b,right:=c);
elif e="," and stops=[")"] then
# expression '(P,C)'
ExpectToken(",");
b:=ReadExpression(stops);
a:=rec(type:="pair",left:=a,right:=b);
else
problemarea();
Error("eh!");
fi;
e:=eset();
od;
fi;
return a;
end;
if tok[tnum]=["K","function"] then
# function
fcomment:="";
thisfctname:=tok[tnum-2][2];
tnum:=tnum+1;
ExpectToken("(");
argus:=[];
locopt:=[];
while not IsAtToken(")") do
a:=ReadExpression([")",","]);
Add(locopt,a.name);
if IsAtToken(",") then ExpectToken(",");fi;
od;
ExpectToken(")");
if IsAtToken("local") then
ExpectToken("local");
while not IsAtToken(";") do
a:=ReadExpression([";",","]);
Add(locopt,a.name);
if IsAtToken(",") then ExpectToken(",");fi;
od;
ExpectToken(";");
fi;
a:=ReadBlock(["end"]:inner);
tnum:=tnum+1; # do end .... token
a:=rec(type:="F",args:=argus,locals:=Union(a[1],locopt),block:=a[2]);
if Length(fcomment)>0 then
a.comment:=fcomment;
fi;
return a;
# todo: parentheses
else
stack:=[];
a:=procidf();
Add(stack,a);
while tok[tnum][2] in lbinops do
op:=tok[tnum][2];
Add(stack,op);
tnum:=tnum+1;
b:=procidf();
Add(stack,b);
#a:=rec(type:=Concatenation("B",op),left:=a,right:=b);
od;
# sort out operation precedence
i:=1;
while Length(stack)>1 do
#Print(stack,"|",OPRECED[i],"|\n");
a:=2;
while a<=Length(stack) do
if stack[a]=OPRECED[i] then
stack:=Concatenation(stack{[1..a-2]},
[rec(type:=Concatenation("B",stack[a]),left:=stack[a-1],right:=stack[a+1])],
stack{[a+2..Length(stack)]});
#Print(stack,"{",OPRECED[i],"}\n");
else
a:=a+2;
fi;
od;
i:=i+1;
od;
return stack[1];
fi;
end;
costack:=[];
cmdstack:=[];
tnum:=1; # indicate in token list
# actual work
a:=ReadBlock(false);
return a[2];
end;
GlobalIdsIn:=function(node)
local list,recurse,b;
recurse:=function(n,ignore)
local l,lign,use,i;
l:=[];
if n.type="I" then
if not (n.name in ignore or n.name in NAMES_SYSTEM_GVARS) then
Add(l,n.name);
fi;
elif n.type="F" then
lign:=Union(ignore,n.args,n.locals);
for i in n.block do
use:=recurse(i,lign);
l:=Union(l,use);
od;
elif n.type="B->" then
lign:=Union(ignore,[n.left.name]);
use:=recurse(n.right,lign);
l:=Union(l,use);
elif n.type="B." or n.type="B!." then
l:=recurse(n.left,ignore);
elif n.type[1]='B' then
# binary op
use:=Union(recurse(n.left,ignore),recurse(n.right,ignore));
l:=use;
elif n.type="A" then
# asignment
use:=Union(recurse(n.left,ignore),recurse(n.right,ignore));
l:=use;
elif n.type="L" or n.type="SL" then
# list access
l:=Union(l,recurse(n.var,ignore));
use:=recurse(n.at,ignore);
l:=Union(l,use);
elif n.type="C" then
l:=Union(l,recurse(n.fct,ignore));
for i in n.args do
use:=recurse(i,ignore);
l:=Union(l,use);
od;
elif n.type="return" then
for i in n.values do
use:=recurse(i,ignore);
l:=Union(l,use);
od;
elif n.type="if" then
l:=Union(l,recurse(n.cond,ignore));
b:=n.block;
if IsBound(n.elseblock) then
b:=Concatenation(b,n.elseblock);
fi;
for i in b do
use:=recurse(i,ignore);
l:=Union(l,use);
od;
elif n.type="for" then
l:=Union(l,recurse(n.var,ignore));
l:=Union(l,recurse(n.from,ignore));
for i in n.block do
use:=recurse(i,ignore);
l:=Union(l,use);
od;
elif n.type="while" or n.type="repeat" then
l:=Union(l,recurse(n.cond,ignore));
for i in n.block do
use:=recurse(i,ignore);
l:=Union(l,use);
od;
elif n.type="V" then
for i in n.args do
use:=recurse(i,ignore);
l:=Union(l,use);
od;
elif n.type="paren" or n.type[1]='U' then
l:=recurse(n.arg,ignore);
elif n.type="C" or n.type="CA" then
l:=Union(l,recurse(n.fct,ignore));
for i in n.args do
use:=recurse(i,ignore);
l:=Union(l,use);
od;
elif n.type="return" then
for i in n.values do
use:=recurse(i,ignore);
l:=Union(l,use);
od;
elif n.type="rec" then
for i in n.components do
use:=recurse(i[2],ignore);
l:=Union(l,use);