Initial commit

internal/platform/validate/helper.go

@@ -0,0 +1,44 @@
+package validate
+
+import (
+	"regexp"
+	"slices"
+	"strings"
+	"unicode/utf8"
+)
+
+// PermittedValue reports whether value appears in permittedValues.
+func PermittedValue[T comparable](value T, permittedValues ...T) bool {
+	return slices.Contains(permittedValues, value)
+}
+
+// Matches reports whether value satisfies rx.
+func Matches(value string, rx *regexp.Regexp) bool {
+	return rx.MatchString(value)
+}
+
+// Unique reports whether values contains no duplicate elements.
+func Unique[T comparable](values []T) bool {
+	uniqueValues := make(map[T]bool)
+
+	for _, value := range values {
+		uniqueValues[value] = true
+	}
+
+	return len(values) == len(uniqueValues)
+}
+
+// NotBlank reports whether value contains non-whitespace characters.
+func NotBlank(value string) bool {
+	return strings.TrimSpace(value) != ""
+}
+
+// MaxChars reports whether value contains at most n Unicode code points.
+func MaxChars(value string, n int) bool {
+	return utf8.RuneCountInString(value) <= n
+}
+
+// MinChars reports whether value contains at least n Unicode code points.
+func MinChars(value string, n int) bool {
+	return utf8.RuneCountInString(value) >= n
+}