jget()
#1: json string
#2: filter
{
	local jtext=$1
	local filter=$2

	local jval=`echo ${jtext}| /usr/bin/jq -e "${filter}"`
	if [ $? -ne 0 ];then 
		echo ${jval} //dump error
		return 1; #error
	fi

	#for string ==> trim prefix/suffix double quot
	jval=`echo ${jval} | sed -e 's/^"//'  -e 's/"$//'`
	echo ${jval}

	return 0
}

jfilter()
#1: json string
#2: filter
{
	local jtext=$1
	local filter=$2

	local jval=`echo ${jtext}| /usr/bin/jq -e "${filter}"`
	if [ $? -ne 0 ];then 
		echo ${jval} //dump error
		return 1; #error
	fi

	echo ${jval}

	return 0
}

check_type()
#1: val
#2: type
{
	echo $1 | /usr/bin/jq -e "${2}" >/dev/null 2>&1
	if [ $? -eq 0 ];then
		echo 1
	else
		echo 0
	fi
}

is_str()
#1: value
{
	local chk_bool=$(check_type $1 "booleans")
 	local chk_num=$(check_type $1 "numbers")
	local chk_obj=$(check_type $1 "objects")
	local chk_array=$(check_type $1 "arrays")
	local chk_null=$(check_type $1 "nulls")
 
 	if [ ${chk_bool} -eq 0 -a ${chk_num} -eq 0 -a ${chk_obj} -eq 0 -a ${chk_array} -eq 0 -a ${chk_null} -eq 0 ];then
 		echo 1
 	else
 		echo 0
 	fi
}

jout_begin()
{
	echo "{" > ${SYNOPKG_BKP_OUTPUT_PATH}
}

jout_end()
{
	echo "\"jout_end_key\": 0}" >> ${SYNOPKG_BKP_OUTPUT_PATH}
}

joutstr()
#1: key
#2: value
{
	echo "\"$1\": \"$2\"," >> ${SYNOPKG_BKP_OUTPUT_PATH}
}

jout()
#1: key
#2: value
{
	echo "\"$1\": $2," >> ${SYNOPKG_BKP_OUTPUT_PATH}
}

jdone()
{
	jout_begin
	jout "result"  true
	jout_end
}

jerr()
#1: error message
{
	jout_begin
	joutstr "err_msg"  "$1"
	jout "result"  false
	jout_end
}

jerrstr()
#1: string section
#2: string key
{
	jout_begin
	jout "err_msg"  "{\"section\": \"$1\", \"key\": \"$2\"}"
	joutstr "result"  false
	jout_end
}

jsize()
#1: json array
{
	local jtext=$1
	local size=0
	
	echo ${jtext} | /usr/bin/jq -e "strings" >/dev/null 2>&1
	local str_chk=$?
	
	echo ${jtext} | /usr/bin/jq -e "arrays" >/dev/null 2>&1
	local array_chk=$?

	if [ ${str_chk} -ne 0 -a ${array_chk} -ne 0 ]; then
		echo "input should be string or array" //dump error
		return 1; #error
	fi

	size=`echo ${jtext} | /usr/bin/jq "length"`
	echo ${size}

	return 0
}

is_number()
{
	ret=`echo $1 | awk '$0 ~/[^0-9]/ { print "no" }'`
	if [ "x${ret}" = "xno" ];then
		return 0
	else
		return 1
	fi
}


jversion_compare()
#compare major version
#1: version1
#2: version2
#@return:
#    - 1: major version1 > major version2 (ex: 2.3 > 1.9)
#    - 0: major version1 == major version2 (ex: 1.7 == 1.0)
#    - 2: major version1 < major version2 (ex: 1.7 < 2.1)
#    - 3: error
{
	local major1=`echo $1 | /usr/bin/cut -d"." -f1`
	local minor1=`echo $1 | /usr/bin/cut -d"." -f2`
	local major2=`echo $2 | /usr/bin/cut -d"." -f1`
	local minor2=`echo $2 | /usr/bin/cut -d"." -f2`

	$(is_number ${major1})
	if [ $? -eq 0 ];then
		return 3
	fi
	$(is_number ${major2})
	if [ $? -eq 0 ];then
		return 3
	fi
	$(is_number ${minor1})
	if [ $? -eq 0 ];then
		return 3
	fi
	$(is_number ${minor2})
	if [ $? -eq 0 ];then
		return 3
	fi

	if [ $major1 -gt $major2 ];then
		return 1
	elif [ $major1 -lt $major2 ];then
		return 2
	elif [ $major1 -eq $major2 ];then
		return 0
	fi

	return 3 #error
}