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#! /usr/bin/env bash
#
# Copyright 2013-2018 Lawrence Livermore National Security, LLC and other
# Spack Project Developers. See the top-level COPYRIGHT file for details.
#
# SPDX-License-Identifier: (Apache-2.0 OR MIT)
function prefix_tokens() {
line="$1" ; shift
nprefix="$1"
line="${line::$nprefix} "
echo "${line::$nprefix}"
}
# read file contents, or stdin
cat "$1" |
# remove blank lines
grep -v '^ *$' |
# remove leading whitespace
sed 's/^ *//g' |
# remove comments
grep -v '^#.*' |
# remove trailing whitespace
sed 's/ *$//g' |
# remove extraneous whitespace
sed 's/ */ /g' |
# mask out subsections
(
stack_level=1
mask_level=1
while read LINE ; do
try_print=1
if [ "$( prefix_tokens "$LINE" 10 )" '=' 'MASK PUSH ' ] ; then
tmp="$stack_level"
stack_level="$(( stack_level + 1 ))"
if [ "$mask_level" '=' "$tmp" ] ; then
mask_level="$stack_level"
fi
try_print=0
elif [ "$( prefix_tokens "$LINE" 9 )" '=' 'MASK POP ' ] ; then
stack_level="$(( stack_level - 1 ))"
if [ "$mask_level" -gt "$stack_level" ] ; then
mask_level="$stack_level"
fi
try_print=0
elif [ "$( prefix_tokens "$LINE" 5 )" '=' 'MASK ' ] ; then
if [ "$(( mask_level + 1 ))" -ge "$stack_level" ] ; then
mask_level="$stack_level"
eval "${LINE:5}"
if [ "$?" '!=' 0 ] ; then
mask_level="$(( mask_level - 1 ))"
fi
fi
try_print=0
fi
if [ "$stack_level" -lt 1 ] ; then
stack_level=1
mask_level=0
fi
if [ "$try_print" '=' 1 -a "$mask_level" '=' "$stack_level" ] ; then
echo "$LINE"
fi
done
)
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