lrc-kit/lib/esm/runner.js

lrc parser, maker, runner

import { Lrc } from './lrc';
var Runner = /** @class */ (function () {
    function Runner(lrc, offset) {
        if (lrc === void 0) { lrc = new Lrc(); }
        if (offset === void 0) { offset = true; }
        this.offset = offset;
        this._currentIndex = -1;
        this.setLrc(lrc);
    }
    Runner.prototype.setLrc = function (lrc) {
        this.lrc = lrc.clone();
        this.lrcUpdate();
    };
    Runner.prototype.lrcUpdate = function () {
        if (this.offset) {
            this._offsetAlign();
        }
        this._sort();
    };
    Runner.prototype._offsetAlign = function () {
        if ('offset' in this.lrc.info) {
            var offset = parseInt(this.lrc.info.offset) / 1000;
            if (!isNaN(offset)) {
                this.lrc.offset(offset);
                delete this.lrc.info.offset;
            }
        }
    };
    Runner.prototype._sort = function () {
        this.lrc.lyrics.sort(function (a, b) { return a.timestamp - b.timestamp; });
    };
    Runner.prototype.timeUpdate = function (timestamp) {
        if (this._currentIndex >= this.lrc.lyrics.length) {
            this._currentIndex = this.lrc.lyrics.length - 1;
        }
        else if (this._currentIndex < -1) {
            this._currentIndex = -1;
        }
        this._currentIndex = this._findIndex(timestamp, this._currentIndex);
    };
    Runner.prototype._findIndex = function (timestamp, startIndex) {
        var curFrontTimestamp = startIndex == -1
            ? Number.NEGATIVE_INFINITY
            : this.lrc.lyrics[startIndex].timestamp;
        var curBackTimestamp = startIndex == this.lrc.lyrics.length - 1
            ? Number.POSITIVE_INFINITY
            : this.lrc.lyrics[startIndex + 1].timestamp;
        if (timestamp < curFrontTimestamp) {
            return this._findIndex(timestamp, startIndex - 1);
        }
        else if (timestamp === curBackTimestamp) {
            if (curBackTimestamp === Number.POSITIVE_INFINITY) {
                return startIndex;
            }
            else {
                return startIndex + 1;
            }
        }
        else if (timestamp > curBackTimestamp) {
            return this._findIndex(timestamp, startIndex + 1);
        }
        else {
            return startIndex;
        }
    };
    Runner.prototype.getInfo = function () {
        return this.lrc.info;
    };
    Runner.prototype.getLyrics = function () {
        return this.lrc.lyrics;
    };
    Runner.prototype.getLyric = function (index) {
        if (index === void 0) { index = this.curIndex(); }
        if (index >= 0 && index <= this.lrc.lyrics.length - 1) {
            return this.lrc.lyrics[index];
        }
        else {
            throw new Error('Index not exist');
        }
    };
    Runner.prototype.curIndex = function () {
        return this._currentIndex;
    };
    Runner.prototype.curLyric = function () {
        return this.getLyric();
    };
    return Runner;
}());
export { Runner };