// SPDX-FileCopyrightText: Copyright 2015-2025 go-swagger maintainers
// SPDX-License-Identifier: Apache-2.0

// Package classify provides small classification predicates used by
// the scanner and by builders to decide whether a given name or
// comment line belongs to a particular Swagger-annotation family.
//
// The package lives beneath internal/scanner/ because classification
// is fundamentally a scanner concern: "does this string denote a
// swagger:xxx construct?" is the same kind of question the scanner
// asks when indexing packages. Builders that need the same predicate
// (vendor-extension key filtering, for instance) import from here
// rather than reaching back into internal/parsers/.
package classify

// IsAllowedExtension reports whether key is a valid Swagger
// vendor-extension key — opens with `x-` or `X-`. Mirrors the
// previous regex `^[Xx]-`: the suffix may be empty (the spec
// itself rejects empty-suffix keys at a higher level).
func IsAllowedExtension(key string) bool {
	return len(key) >= 2 && (key[0] == 'x' || key[0] == 'X') && key[1] == '-'
}
