#!/bin/bash

read_query_string() {
	local			\
		exprgraph	\
		exprtime	\
		name		\
		query_data	\
		value		\

	if [ -n "$QUERY_STRING" ]
	then
		query_data="${QUERY_STRING//&/
	}"
		exprtime='[[:alnum:]-]+'
		exprgraph='[[:alpha:]_]+'
		exprprev='[[:digit:]]+[(d(ay)?)(w(eek)?)(month)(y(ear)?)]'
		while read name value
		do
			case $name in
				start)
					[[ $value =~ $exprtime ]] && start=$value
				;;
				end)
					[[ $value =~ $exprtime ]] && end=$value
				;;
				hist|trend)
					show_graphs=1
				;;
				graph)
					[[ $value =~ $exprgraph ]] && graph=$value
				;;
				show)
					[[ $value == all ]] && show_all=1
				;;
				prevperiod)
					[[ $value =~ $exprprev ]] && prevperiod=$value
				;;
			esac
		done <<<"${query_data//=/ }"
	fi
}