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check_brackets.R

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    check_brackets.R 1.34 KiB
    #  check_brackets.R
    #  FBA and friends with R.
    #
    #  Copyright (C) 2010-2014 Gabriel Gelius-Dietrich, Dpt. for Bioinformatics,
    #  Institute for Informatics, Heinrich-Heine-University, Duesseldorf, Germany.
    #  All right reserved.
    #  Email: geliudie@uni-duesseldorf.de
    #
    #  This file is part of sybil.
    #
    #  Sybil is free software: you can redistribute it and/or modify
    #  it under the terms of the GNU General Public License as published by
    #  the Free Software Foundation, either version 3 of the License, or
    #  (at your option) any later version.
    #
    #  Sybil is distributed in the hope that it will be useful,
    #  but WITHOUT ANY WARRANTY; without even the implied warranty of
    #  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    #  GNU General Public License for more details.
    #
    #  You should have received a copy of the GNU General Public License
    #  along with sybil.  If not, see <http://www.gnu.org/licenses/>.
    
    
    ################################################
    # Function: .check_brackets
    #
    #
    #
    
    
    # check, whether we have the same number of '(' and ')'.
    .check_brackets <- function(rule) {
    
        i  <- 1
        nb <- 0
        nc <- length(rule)
    
        while ( (nb >= 0) && (i <= nc) ) {
            switch(rule[i],
                "(" = { nb <- nb + 1 },
                ")" = { nb <- nb - 1 }
            )
            i <- i + 1
        }
    
        return( ifelse(nb == 0, TRUE, FALSE) )
    
    }