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stringAssertion.go
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stringAssertion.go
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package arg
import (
"fmt"
"regexp"
"sort"
"github.com/Bofry/arg/internal"
)
var (
_StringAssertion = StringAssertion("")
_ StringValidator = _StringAssertion.NonEmpty
)
type StringAssertion string
func (StringAssertion) Assert(v string, name string, validators ...StringValidator) error {
for _, validate := range validators {
if err := validate(v, name); err != nil {
return err
}
}
return nil
}
func (StringAssertion) Assertor(v string, name string) *StringAssertor {
return &StringAssertor{
v: v,
name: name,
}
}
func (StringAssertion) NonEmpty(v string, name string) error {
if len(v) == 0 {
return &InvalidArgumentError{
Name: name,
Reason: internal.ERR_EMPTY_STRING,
}
}
return nil
}
// Must checks if the given string is evaluated to true by specified predicate.
func (StringAssertion) Must(fn StringPredicate) StringValidator {
return func(v, name string) error {
if !fn(v) {
return &InvalidArgumentError{
Name: name,
Reason: fmt.Sprintf(internal.ERR_INVALID_STRING, v),
}
}
return nil
}
}
func (StringAssertion) In(values ...string) StringValidator {
sort.Slice(values, func(i, j int) bool { return values[i] < values[j] })
return func(v, name string) error {
i := sort.Search(len(values), func(i int) bool { return values[i] >= v })
if i >= len(values) || values[i] != v {
return &InvalidArgumentError{
Name: name,
Reason: fmt.Sprintf(internal.ERR_INVALID_STRING, v),
}
}
return nil
}
}
func (StringAssertion) MaxLength(size int) StringValidator {
return func(v, name string) error {
if len(v) > size {
return &InvalidArgumentError{
Name: name,
Reason: internal.ERR_STRING_TOO_LONG,
}
}
return nil
}
}
func (StringAssertion) MinLength(size int) StringValidator {
return func(v, name string) error {
if len(v) < size {
return &InvalidArgumentError{
Name: name,
Reason: internal.ERR_STRING_TOO_SHORT,
}
}
return nil
}
}
// MatchAny checks if given string match any one from specified patterns.
func (StringAssertion) MatchAny(patterns ...string) StringValidator {
var regex []*regexp.Regexp
for _, pattern := range patterns {
r, err := regexp.Compile(pattern)
if err != nil {
panic(fmt.Sprintf(internal.ERR_INVALID_REGEX_PATTERN, pattern))
}
regex = append(regex, r)
}
return func(v, name string) error {
for _, pattern := range regex {
if pattern.MatchString(v) {
return nil
}
}
return &InvalidArgumentError{
Name: name,
Reason: fmt.Sprintf(internal.ERR_INVALID_STRING, v),
}
}
}