#!/bin/bash
## -----------------------------------------------------------------------
## -----------------------------------------------------------------------

## -----------------------------------------------------------------------
## Intent: Set state flags for parsing based on detection of switch modifiers
## -----------------------------------------------------------------------
function getopt_detect_modifiers()
{
    local arg="$1"; shift

    local -a patterns=()
    patterns+=('and'  'or')
    patterns+=('excl' 'incl')
    patterns+=('in'   'not')
    patterns+=('is-empty')

    unset getopt_argv_AND
    unset getopt_argv_EXCL
    unset getopt_argv_INCL
    unset getopt_argv_IN
    unset getopt_argv_IS_EMPTY
    unset getopt_argv_NOT
    unset getopt_argv_OR

    local pattern
    for pattern in "${patterns[@]}";
    do
        # echo "** ${FUNCNAME} pattern=[$pattern], arg=[$arg]"
        case "$pattern" in
            'and')
                case "$arg" in
                    *'-'[aA][nN][dD]*)        declare -g -i getopt_argv_AND=1 ;;
                esac
                ;;

            'or')
                case "$arg" in
                    *'-'[oO][rR]*)
                        declare -g -i getopt_argv_OR=1
                        ;;
                esac
                ;;

            'excl')
                case "$arg" in                    
                    *'-'[eE][xX][cC][lL]*)    declare -g -i getopt_argv_EXCL=1 ;;
                esac
                ;;
            
            'incl')
                case "$arg" in                    
                    *'-'[iI][nN][cC][lL]*)    declare -g -i getopt_argv_INCL=1 ;;
                esac
                ;;

            'in')
                if [[ ! -v getopt_argv_INCL ]]; then
                    case "$arg" in                    
                        *'-'[iI][nN]*)            declare -g -i getopt_argv_IN=1 ;;
                    esac
                fi
                ;;

            'is-empty')
                case "$arg" in                    
                    *'-'[iI][sS]-[eE][mM][pP][tT][yY])  declare -g -i getopt_argv_IS_EMPTY=1 ;;
                esac
                ;;

            'not')
                case "$arg" in                    
                    *'-'[nN][oO][tT]*)        declare -g -i getopt_argv_NOT=1 ;;
                esac
                ;;

        esac
        
    done

    if false; then
        [[ -v getopt_argv_AND ]] && { declare -p getopt_argv_AND; }
        [[ -v getopt_argv_EXCL ]] && { declare -p getopt_argv_EXCL; }
        [[ -v getopt_argv_INCL ]] && { declare -p getopt_argv_INCL; }
        [[ -v getopt_argv_IN ]] && { declare -p getopt_argv_IN; }
        [[ -v getopt_argv_IS_EMPTY ]] && { declare -p getopt_argv_IS_EMPTY; }
        [[ -v getopt_argv_NOT ]] && { declare -p getopt_argv_NOT; }
        [[ -v getopt_argv_OR ]] && { declare -p getopt_argv_OR; }
    fi

    ## Persistent flags
    [[ -v getopt_argv_AND ]] && { declare -g -i getopt_argv_any_AND=1; }
    [[ -v getopt_argv_OR ]]  && { declare -g -i getopt_argv_any_OR=1; }

    if false; then
       [[ -v getopt_argv_any_AND ]] && { declare -g -i getopt_argv_any_AND; }
       [[ -v getopt_argv_any_OR ]]  && { declare -g -i getopt_argv_any_OR; }
    fi


    : # return $?==0
    return
}

# [EOF]