aneurinandClaude Sonnet 5
82611a5e96
Broadens the built-in set with the string/presence checks that came up most often when reaching for this package: - Required[T comparable] non-zero value - Prefix / Suffix / Contains strings.HasPrefix/HasSuffix/Contains - Match(*regexp.Regexp) arbitrary pattern All follow the existing shape: a constructor returning func(T) error, a sentinel error matched with errors.Is, table-driven tests and an Example. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
42 lines
957 B
Go
42 lines
957 B
Go
package validate
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import (
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"strings"
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)
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var (
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ErrMissingPrefix = NewError("must start with %q")
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ErrMissingSuffix = NewError("must end with %q")
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ErrMissingSubstring = NewError("must contain %q")
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)
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// Prefix validates that a string begins with a given prefix.
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func Prefix(prefix string) func(string) error {
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return func(value string) error {
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if !strings.HasPrefix(value, prefix) {
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return ErrMissingPrefix.With(prefix)
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}
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return nil
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}
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}
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// Suffix validates that a string ends with a given suffix.
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func Suffix(suffix string) func(string) error {
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return func(value string) error {
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if !strings.HasSuffix(value, suffix) {
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return ErrMissingSuffix.With(suffix)
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}
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return nil
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}
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}
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// Contains validates that a string contains a given substring.
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func Contains(substr string) func(string) error {
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return func(value string) error {
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if !strings.Contains(value, substr) {
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return ErrMissingSubstring.With(substr)
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}
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return nil
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}
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}
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