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//   Copyright Bruno Pinçon, ESIAL-IECN, Inria CORIDA project
//   <bruno.pincon@iecn.u-nancy.fr>
//
// This set of scilab 's macros provide a few sparse utilities.
//
// This software is governed by the CeCILL license under French law and
// abiding by the rules of distribution of free software.  You can  use,
// modify and/ or redistribute the software under the terms of the CeCILL
// license as circulated by CEA, CNRS and INRIA at the following URL
// "http://www.cecill.info".
//
// As a counterpart to the access to the source code and  rights to copy,
// modify and redistribute granted by the license, users are provided only
// with a limited warranty  and the software's author,  the holder of the
// economic rights,  and the successive licensors  have only  limited
// liability.
//
// In this respect, the user's attention is drawn to the risks associated
// with loading,  using,  modifying and/or developing or reproducing the
// software by the user in light of its specific status of free software,
// that may mean  that it is complicated to manipulate,  and  that  also
// therefore means  that it is reserved for developers  and  experienced
// professionals having in-depth computer knowledge. Users are therefore
// encouraged to load and test the software's suitability as regards their
// requirements in conditions enabling the security of their systems and/or
// data to be ensured and,  more generally, to use and operate it in the
// same conditions as regards security.
//
// The fact that you are presently reading this means that you have had
// knowledge of the CeCILL license and that you accept its terms.

function [col, mark] = ana_style(style)
    //
    //  an utility for PlotSparse
    //
    tab_col  = ["k" "b" "r" "g" "c" "m" "y" "t" "G"]
    num_col  = [ 1   2   5   3   4   6  32  16  13 ]
    tab_mark = ["." "+" "x" "*" "D" "d" "^" "v" "o"]
    num_mark = [ 0   1   2   3   4   5   6   7   9 ]

    deff("[b] = is_digit(c)",[ "code = _str2code(c)";...
    "b = 0 <= code & code <= 9" ])
    n = length(style)
    if n >= 1 then
        c = part(style,1) ; ic = 1
        ind = grep(tab_col, c)
        if ind == [] then
            if is_digit(c) then
                while %t
                    ic = ic+1
                    if ic <= n then
                        c = part(style,ic)
                        if ~is_digit(c) then , break, end
                    else
                        break
                    end
                end
                col = evstr(part(style,1:ic-1))
                nb_col = xget("lastpattern")
                if col < 1  |  col > nb_col then
                    col = default_markColor
                end
            else
                col = default_markColor
            end
        else
            ic = 2
            col = num_col(ind)
        end
        reste = part(style,ic:n)
        if reste == "" then
            mark = default_markId
        else
            ind = grep(tab_mark, part(style,ic:n))
            if ind == [] then
                mark = default_markId
            else
                mark = num_mark(ind)
            end
        end
    else
        col = default_markColor ; mark = default_markId
    end

endfunction