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refactor(utils/lyrics): better parsing logic

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pan93412 2022-01-26 23:41:53 +08:00
parent 1c7344beaf
commit 3ddfe9c3bb
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1 changed files with 29 additions and 24 deletions
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53
src/utils/lyrics.js
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@ -9,32 +9,37 @@ export function lyricParser(lrc) {
};
}
export function parseLyric(lrc) {
const lyrics = lrc.split('\n');
const lrcObj = [];
for (let i = 0; i < lyrics.length; i++) {
const lyric = lyrics[i];
const timeReg = /\[\d*:\d*((\.|:)\d*)*\]/g;
const timeRegExpArr = lyric.match(timeReg);
if (!timeRegExpArr) continue;
const content = lyric.replace(timeReg, '');
for (let k = 0, h = timeRegExpArr.length; k < h; k++) {
const t = timeRegExpArr[k];
const min = Number(String(t.match(/\[\d*/i)).slice(1));
const sec = Number(String(t.match(/:\d*/i)).slice(1));
const ms = Number(t.match(/\d*\]/i)[0].slice(0, 2)) / 100;
const time = min * 60 + sec + ms;
if (content !== '') {
lrcObj.push({
time: time,
rawTime: timeRegExpArr[0],
const extractTimeRegex = /^(?<rawTime>\[(?<min>\d+):(?<sec>\d+)(?:\.|:)(?<ms>\d+)\])\s*(?<content>(.+|))$/;
function parseLyric(lrc) {
const lyrics = lrc.trim().split('\n');
const parsedLyrics = lyrics
.filter(lyric => lyric.length) // filter the lyric line which is empty
.map((/** @type {string} */ line) => {
try {
const extractedLyric = extractTimeRegex.exec(line);
// If this line is not a lyric.
if (!extractedLyric) throw 'This line is not a lyric.';
// Otherwise, we extract the lyric part.
const { rawTime, min, sec, ms, content } = extractedLyric.groups;
const time = Number(min) * 60 + Number(sec) + 0.01 * Number(ms);
return {
time,
rawTime,
content: trimContent(content),
});
};
} catch (e) {
console.warn(`Failed to extract "${line}". ${e}`);
}
}
}
lrcObj.sort((a, b) => a.time - b.time);
return lrcObj;
})
.filter(response => !!response) // remove "undefined" entries
.sort((a, b) => a.time - b.time);
return parsedLyrics;
}
function trimContent(content) {