bash - loadConfig

loadConfig.sh

loadConfig() {
    local var_name="$1"
    local config_file="$2"
    declare -A config
    local config=()

    local line_num=0
    while read -r line; do
        #echo ">$line<"
        let line_num++

        if [[ $line =~ ^$|^\# ]]; then
            continue
        fi

        # sq-str: single-quote-string
        # dq-str: double-quote-string
        # - - - - - - - - (      key      ) - - - - - (=) - - - - - - -(   sq-str    ) - - (   dq-str    )- -( boolean  |           numbers            )
        if [[ ! $line =~ ^([a-zA-Z0-9_.-]+)[[:space:]]*=[[:space:]]*(\'(([^\']|\\\')*)\'|\"(([^\"]|\\\")*)\"|(true|false|(0|[1-9][0-9]*)(\.[0-9]+){0,1}))$ ]]; then
            echo >&2 "ERROR: ${SCRIPT_NAME}: Invalid config: ${config_file}:${line_num}"
            exit 1
        fi

        local key="${BASH_REMATCH[1]}"
        local string_single_quote="${BASH_REMATCH[3]//\\\'/\'}"
        local string_double_quote="${BASH_REMATCH[5]//\\\"/\"}"
        local other_vaues="${BASH_REMATCH[7]}"
        local value="${string_single_quote}${string_double_quote}${other_vaues}"

        config[$key]="$value"

        #for x in "${BASH_REMATCH[@]}"; do
        #    echo "|$x|"
        #done
    done < "$config_file"

    local serialized="$(declare -p config)"
    local serialized_data="${serialized#*=}"
    declare -gA "${var_name}=${serialized_data}"
}

loadConfig CONFIG <(cat <<EOF
# Comments are ignored as well as empty lines
    # Indents don't matter

hello = "config"
    hello.text = "It is okay to use \"escaped\" quotes."
    hello.text2 = 'This also applies to \'single quoted\' strings.'
    
wow = true
pi = 3.1415
THE_ANSWER = 42
EOF
)

echo "Hello, ${CONFIG[hello]}!"
echo "${CONFIG[hello.text]}"
echo "${CONFIG[hello.text2]}"
echo "${CONFIG[wow]}"
echo "${CONFIG[pi]}"
echo "${CONFIG[THE_ANSWER]}"