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this brings more advanced lrc parsing as a fallback
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,51 @@ | ||
| /// all parsers extend this class | ||
| abstract class LyricsParse { | ||
| String lyric; | ||
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| LyricsParse(this.lyric); | ||
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| /// call this method to parse | ||
| List<LyricsLineModel> parseLines({bool isMain = true}); | ||
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| /// verify [lyric] is matching | ||
| bool isOK() => true; | ||
| } | ||
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| class LyricsLineModel { | ||
| String? mainText; | ||
| String? extText; | ||
| int? startTime; | ||
| int? endTime; | ||
| List<LyricSpanInfo>? spanList; | ||
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| Duration? get timeStamp => startTime == null ? null : Duration(milliseconds: startTime!); | ||
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| bool get hasExt => extText?.isNotEmpty == true; | ||
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| bool get hasMain => mainText?.isNotEmpty == true; | ||
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| List<LyricSpanInfo>? _defaultSpanList; | ||
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| get defaultSpanList => _defaultSpanList ??= [ | ||
| LyricSpanInfo() | ||
| ..duration = (endTime ?? 0) - (startTime ?? 0) | ||
| ..start = startTime ?? 0 | ||
| ..length = mainText?.length ?? 0 | ||
| ..raw = mainText ?? "" | ||
| ]; | ||
| } | ||
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| class LyricSpanInfo { | ||
| int index = 0; | ||
| int length = 0; | ||
| int duration = 0; | ||
| int start = 0; | ||
| String raw = ""; | ||
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| double drawWidth = 0; | ||
| double drawHeight = 0; | ||
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| int get end => start + duration; | ||
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| int get endIndex => index + length; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,65 @@ | ||
| import 'models.dart'; | ||
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| ///normal lyric parser | ||
| class LRCParserLrc extends LyricsParse { | ||
| RegExp pattern = RegExp(r"\[\d{2}:\d{2}.\d{2,3}]"); | ||
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| ///匹配普通格式内容 | ||
| ///eg:[00:03.47] -> 00:03.47 | ||
| RegExp valuePattern = RegExp(r"\[(\d{2}:\d{2}.\d{2,3})\]"); | ||
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| LRCParserLrc(String lyric) : super(lyric); | ||
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| @override | ||
| List<LyricsLineModel> parseLines({bool isMain = true}) { | ||
| //读每一行 | ||
| var lines = lyric.split("\n"); | ||
| if (lines.isEmpty) { | ||
| return []; | ||
| } | ||
| List<LyricsLineModel> lineList = []; | ||
| for (var line in lines) { | ||
| //匹配time | ||
| var time = pattern.stringMatch(line); | ||
| if (time == null) { | ||
| //没有匹配到直接返回 | ||
| continue; | ||
| } | ||
| //移除time，拿到真实歌词 | ||
| var realLyrics = line.replaceFirst(pattern, ""); | ||
| //转时间戳 | ||
| var ts = timeTagToTS(time); | ||
| var lineModel = LyricsLineModel()..startTime = ts; | ||
| if (realLyrics == "//") { | ||
| realLyrics = ""; | ||
| } | ||
| if (isMain) { | ||
| lineModel.mainText = realLyrics; | ||
| } else { | ||
| lineModel.extText = realLyrics; | ||
| } | ||
| lineList.add(lineModel); | ||
| } | ||
| return lineList; | ||
| } | ||
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| int? timeTagToTS(String timeTag) { | ||
| if (timeTag.trim().isEmpty) { | ||
| return null; | ||
| } | ||
| //通过正则取出value | ||
| var value = valuePattern.firstMatch(timeTag)?.group(1) ?? ""; | ||
| if (value.isEmpty) { | ||
| return null; | ||
| } | ||
| var timeArray = value.split("."); | ||
| var padZero = 3 - timeArray.last.length; | ||
| var millisecond = timeArray.last.padRight(padZero, "0"); | ||
| //避免出现奇葩 | ||
| if (millisecond.length > 3) { | ||
| millisecond = millisecond.substring(0, 3); | ||
| } | ||
| var minAndSecArray = timeArray.first.split(":"); | ||
| return Duration(minutes: int.parse(minAndSecArray.first), seconds: int.parse(minAndSecArray.last), milliseconds: int.parse(millisecond)).inMilliseconds; | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,71 @@ | ||
| import 'models.dart'; | ||
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| ///qrc lyric parser | ||
| class LRCParserQrc extends LyricsParse { | ||
| RegExp advancedPattern = RegExp(r"""\[\d+,\d+]"""); | ||
| RegExp qrcPattern = RegExp(r"""\((\d+,\d+)\)"""); | ||
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| RegExp advancedValuePattern = RegExp(r"\[(\d*,\d*)\]"); | ||
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| LRCParserQrc(String lyric) : super(lyric); | ||
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| @override | ||
| List<LyricsLineModel> parseLines({bool isMain = true}) { | ||
| lyric = RegExp(r"""LyricContent="([\s\S]*)">""").firstMatch(lyric)?.group(1) ?? lyric; | ||
| //读每一行 | ||
| var lines = lyric.split("\n"); | ||
| if (lines.isEmpty) { | ||
| return []; | ||
| } | ||
| List<LyricsLineModel> lineList = []; | ||
| for (var line in lines) { | ||
| //匹配time | ||
| var time = advancedPattern.stringMatch(line); | ||
| if (time == null) { | ||
| //没有匹配到直接返回 | ||
| continue; | ||
| } | ||
| //转时间戳 | ||
| var ts = int.parse(advancedValuePattern.firstMatch(time)?.group(1)?.split(",")[0] ?? "0"); | ||
| //移除time，拿到真实歌词 | ||
| var realLyrics = line.replaceFirst(advancedPattern, ""); | ||
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| List<LyricSpanInfo> spanList = getSpanList(realLyrics); | ||
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| var lineModel = LyricsLineModel() | ||
| ..mainText = realLyrics.replaceAll(qrcPattern, "") | ||
| ..startTime = ts | ||
| ..spanList = spanList; | ||
| lineList.add(lineModel); | ||
| } | ||
| return lineList; | ||
| } | ||
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| ///get line span info list | ||
| List<LyricSpanInfo> getSpanList(String realLyrics) { | ||
| var invalidLength = 0; | ||
| var startIndex = 0; | ||
| var spanList = qrcPattern.allMatches(realLyrics).map((element) { | ||
| var span = LyricSpanInfo(); | ||
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| span.raw = realLyrics.substring(startIndex + invalidLength, element.start); | ||
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| var elementText = element.group(0) ?? ""; | ||
| span.index = startIndex; | ||
| span.length = element.start - span.index - invalidLength; | ||
| invalidLength += elementText.length; | ||
| startIndex += span.length; | ||
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| var time = (element.group(1)?.split(",") ?? ["0", "0"]); | ||
| span.start = int.parse(time[0]); | ||
| span.duration = int.parse(time[1]); | ||
| return span; | ||
| }).toList(); | ||
| return spanList; | ||
| } | ||
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| @override | ||
| bool isOK() { | ||
| return lyric.contains("LyricContent=") || advancedPattern.stringMatch(lyric) != null; | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,18 @@ | ||
| import 'models.dart'; | ||
| import 'parser_lrc.dart'; | ||
| import 'parser_qrc.dart'; | ||
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| ///smart parser | ||
| ///Parser is automatically selected | ||
| class LRCParserSmart extends LyricsParse { | ||
| LRCParserSmart(String lyric) : super(lyric); | ||
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| @override | ||
| List<LyricsLineModel> parseLines({bool isMain = true}) { | ||
| var qrc = LRCParserQrc(lyric); | ||
| if (qrc.isOK()) { | ||
| return qrc.parseLines(isMain: isMain); | ||
| } | ||
| return LRCParserLrc(lyric).parseLines(isMain: isMain); | ||
| } | ||
| } |
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