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function r=isinstring(str,pos)
// Copyright INRIA
// Finds if the character pointed by pos is in a string (return %T) or not (return %F)
str=part(str,1:pos-1)
quote="''"
// If no quote in before pos
if strindex(str,quote)==[] then
r=%F
return
end
ksym=0
strcnt=0
qcount=0 // Quote counter
bcount=0 // Bracket counter
pcount=0 // Paranthesis counter
sym=' '
while %T ,
while %T then // Looking for next non white character
if ksym>=pos then
r=strcnt<>0;
return
end
ksym=ksym+1;
psym=sym; // psym = previous symbol
sym=part(str,ksym);
if sym<>' ' then break,end
end
if strcnt<>0 then // If in a string
if sym==quote then
qcount=1
while part(str,ksym+1)<>quote&ksym+1<pos then // Searching for quote or end of string
ksym=ksym+1
end
// 5 following lines added 25/02/2003 (it seemed to work before...)
// if ksym+1<pos then // Added by VC 17/03/2003 because didn't work for following string 'a'.^[1+1i] (pb in i_notation())
// qcount=qcount+1
// end // Added by VC 17/03/2003
while part(str,ksym+1)==quote&ksym+1<pos then // Searching for a sequence of quotes
ksym=ksym+1
qcount=qcount+1
end
// End of part added 25/02/2003
if 2*int(qcount/2)<>qcount then
strcnt=0
sym=part(str,ksym)
end
end
elseif sym==quote then
// Check if transpose or beginning of a string
if abs(str2code(psym))>=36&psym<>')'&psym<>']'&psym<>'.'&psym<>quote then // Not a transpose
strcnt=1
elseif bcount<>0 then // Inside a matrix definition
if part(str,ksym-1)==' ' then strcnt=1,end
end
elseif sym=='[' then
bcount=bcount+1
elseif sym==']' then
bcount=bcount-1
end
end
endfunction
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