Fs02/grimoire

package changeset

import (
    "regexp"
    "strings"
)

// ValidateRegexpErrorMessage is the default error message for ValidateRegexp.
var ValidateRegexpErrorMessage = "{field}'s format is invalid"

// ValidateRegexp validates the value of given field to match given regexp.
func ValidateRegexp(ch *Changeset, field string, exp *regexp.Regexp, opts ...Option) {
    val, exist := ch.changes[field]
    if !exist {
        return
    }

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

    if str, ok := val.(string); ok {
        match := exp.MatchString(str)
        if !match {
            msg := strings.Replace(options.message, "{field}", field, 1)
            AddError(ch, field, msg)
        }
        return
    }
}