grokify/mogo

package month

import (
    "errors"
    "strings"
    "time"

    "github.com/grokify/mogo/type/stringsutil"
)

const (
    MonthsEnAbbr3 = "Jan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov,Dec"
    MonthsEnFull  = "January,February,March,April,May,June,July,August,September,October,November,December"
)

var (
    ErrMonthsFormatInvalid = errors.New("invalid number of month elements")
    ErrMonthNotFound       = errors.New("month not found")
)

func Parse(months []string, value string, insensitive bool) (time.Month, error) {
    enums := months
    if len(enums) == 1 {
        enums = strings.Split(enums[0], ",")
    }
    enums = stringsutil.SliceCondenseSpace(enums, true, false)
    if len(enums) != 12 {
        return time.January, ErrMonthsFormatInvalid
    }
    value = strings.TrimSpace(value)
    if insensitive {
        value = strings.ToLower(value)
    }

    for i, monthTry := range enums {
        if (insensitive && strings.ToLower(monthTry) == value) ||
            monthTry == value {
            return time.Month(i + 1), nil
        }
    }
    return time.January, ErrMonthNotFound
}