// Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
// Copyright (C) ???? - INRIA - Scilab
//
// This file must be used under the terms of the CeCILL.
// This source file is licensed as described in the file COPYING, which
// you should have received as part of this distribution.  The terms
// are also available at
// http://www.cecill.info/licences/Licence_CeCILL_V2.1-en.txt

function k=isacomment(txt)
    // Find if txt contains a Matlab comment
    // If no return 0
    // If yes return the position of the beginning of the comment

    kc=strindex(txt,"%")
    k=0
    if kc<>[] then
        kq=strindex(txt,quote)
        while %t then
            qc=size(find(kq<kc(1)),2) // qc = nb of quote placed before the first %
            // Even number of quote before first %
            if modulo(qc,2)==0 then
                k=kc(1)
                break
            else // There is a single quote before %, have to check for the beginning of the string
                while qc>2 then
                    if (kq(qc-1)==kq(qc)-1) then // Found a '' sequence
                        qc=qc-2
                    else
                        break
                    end
                end
                kk=kq(qc)
                if execstr("prev = part(txt,kk-1)","errcatch")<>0 then pause,end;errclear();
                if or(prev==[" ",",",";","=","[","("]) then // qc points on a string beginning
                    kc(1)=[]
                    if kc==[] then break,end
                else
                    k=kc(1)
                    break
                end
            end
        end
    end
endfunction