claudeandClaude Sonnet 5
164dcbf367
MinLength/MaxLength now count runes, leaving no way to bound a string by its byte size -- still wanted for fixed-width columns and wire-format fields. Add the byte-counting pair alongside them, with their own "%d bytes" sentinels (ErrMustHaveMoreBytes / ErrMustHaveFewerBytes). Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
58 lines
1.7 KiB
Go
58 lines
1.7 KiB
Go
package validate
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import "unicode/utf8"
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var (
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ErrMustBeLonger = NewError("must contain at least %d characters")
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ErrMustBeShorter = NewError("must contain no more than %d characters")
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ErrMustHaveMoreBytes = NewError("must have at least %d bytes")
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ErrMustHaveFewerBytes = NewError("must have no more than %d bytes")
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)
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// MaxLength validates that a string is no longer than a given maximum.
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// Length is counted in runes, so multi-byte characters count as one.
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func MaxLength(l int) func(string) error {
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return func(value string) error {
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if utf8.RuneCountInString(value) > l {
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return ErrMustBeShorter.With(l)
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}
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return nil
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}
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}
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// MinLength validates that a string is at least a given minimum length.
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// Length is counted in runes, so multi-byte characters count as one.
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func MinLength(l int) func(string) error {
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return func(value string) error {
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if utf8.RuneCountInString(value) < l {
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return ErrMustBeLonger.With(l)
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}
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return nil
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}
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}
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// MaxLengthBytes validates that a string is no longer than a given maximum
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// number of bytes (len). Prefer [MaxLength] for a limit on visible
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// characters; use this when the budget is genuinely a byte count, such as
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// a fixed-width column or a wire-format field.
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func MaxLengthBytes(l int) func(string) error {
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return func(value string) error {
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if len(value) > l {
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return ErrMustHaveFewerBytes.With(l)
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}
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return nil
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}
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}
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// MinLengthBytes validates that a string is at least a given minimum
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// number of bytes (len). See [MaxLengthBytes] on when to prefer this over
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// [MinLength].
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func MinLengthBytes(l int) func(string) error {
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return func(value string) error {
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if len(value) < l {
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return ErrMustHaveMoreBytes.With(l)
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}
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return nil
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}
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}
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