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easejs/tools/rmtrail

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#!/bin/sh
#
# Removes trailing commas from array and object declarations (certain browsers,
# such as earlier versions of IE, do not parse trailing commas correctly)
#
# This is a very simple (dumb) system. It does not check to ensure we're not
# replacing text inside a string, nor is it 100% certain we're in an array or
# object declaration. However, until such an implementation is needed, I'd like
# to keep it as simple (and fast) as possible. The below implementation is
# suitable for our needs.
#
# Copyright (C) 2010, 2011, 2012 Mike Gerwitz
#
# This file is part of GNU ease.js.
#
# This program 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.
#
# This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
# #
# read from stdin
cat - \
| sed -n '
# copy first line to hold buffer
1h
# if not the first line, append to hold buffer
1!H
# if last line, process
$ {
# pull from hold and perform replacement
g
s/,\(\s*[]}]\)/\1/g
# print result
p
}
'
exit 0