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# 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) )
}
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