GenreParser.kt

Each line, with the release that last changed it.

0.5.0	1	package dev.stave.domain.model
	2
	3	/**
	4	* Parse a genre string into individual genre tokens.
	5	*
	6	* UPnP/DIDL servers emit multi-genre tags with inconsistent separators across
	7	* implementations and across the source files' own metadata conventions:
	8	* MinimServer "Rock; Pop"
	9	* iTunes / ID3v2.4 "Rock/Pop" or "Rock\Pop"
	10	* Foobar2000 "Rock // Pop"
	11	* Plex / BubbleUPnP "Rock, Pop"
	12	* Doubled variants "Rock\\Pop" (escaped-backslash or literal double-backslash)
	13	*
	14	* We collapse `//` and `\\` to single delimiters first, then split on any of
	15	* `,`, `;`, `/`, `\`. Tokens are trimmed; blanks are discarded. Order preserved.
	16	*
	17	* Returns an empty list for null/blank input. Doesn't lowercase — callers that need
	18	* case-insensitive comparison should do that themselves.
	19	*/
	20	fun parseGenres(raw: String?): List<String> {
	21	if (raw.isNullOrBlank()) return emptyList()
	22	// Collapse doubled separators first. Without this, "Rock // Pop" split on `/` would
	23	// yield ["Rock ", " ", " Pop"], and the middle empty token would pass through trim()
	24	// as "" and get filtered out — slow but correct. Doing this first is cheaper and
	25	// also handles the literal-double-backslash case "Rock\\Pop" which would otherwise
	26	// split to ["Rock", "", "Pop"].
	27	val normalized = raw
	28	.replace("//", "/")
	29	.replace("\\\\", "\\")
	30	return normalized
	31	.split(',', ';', '/', '\\')
	32	.map { it.trim() }
	33	.filter { it.isNotEmpty() }
	34	}