Fs02/grimoire

package changeset

import (
    "strconv"
    "strings"
)

// ValidateRangeErrorMessage is the default error message for ValidateRange.
var ValidateRangeErrorMessage = "{field} must be between {min} and {max}"

// ValidateRange validates the value of given field is not larger than max and not smaller than min.
// Validation can be performed against string, slice and numbers.
func ValidateRange(ch *Changeset, field string, min int, max int, opts ...Option) {
    val, exist := ch.changes[field]
    if !exist {
        return
    }

    options := Options{
        message: ValidateRangeErrorMessage,
    }
    options.apply(opts)

    invalid := false

    switch v := val.(type) {
    case string:
        invalid = len(v) < min || len(v) > max
    case []interface{}:
        invalid = len(v) < min || len(v) > max
    case int:
        invalid = v < min || v > max
    case int8:
        invalid = v < int8(min) || v > int8(max)
    case int16:
        invalid = v < int16(min) || v > int16(max)
    case int32:
        invalid = v < int32(min) || v > int32(max)
    case int64:
        invalid = v < int64(min) || v > int64(max)
    case uint:
        invalid = v < uint(min) || v > uint(max)
    case uint8:
        invalid = v < uint8(min) || v > uint8(max)
    case uint16:
        invalid = v < uint16(min) || v > uint16(max)
    case uint32:
        invalid = v < uint32(min) || v > uint32(max)
    case uint64:
        invalid = v < uint64(min) || v > uint64(max)
    case uintptr:
        invalid = v < uintptr(min) || v > uintptr(max)
    case float32:
        invalid = v < float32(min) || v > float32(max)
    case float64:
        invalid = v < float64(min) || v > float64(max)
    }

    if invalid {
        r := strings.NewReplacer("{field}", field, "{min}", strconv.Itoa(min), "{max}", strconv.Itoa(max))
        AddError(ch, field, r.Replace(options.message))
    }
}