date-limits/dist/esm/generators/general-generator.js

Check if a date is before a flexible limit.

import { generateSequence } from '../sequence';
export class GeneralGenerator {
    constructor(config = undefined, startFrom, upperLimit) {
        this.config = config;
        this.startFrom = startFrom;
        this.upperLimit = upperLimit;
        //! Static
        this._looped = false;
        if (config === undefined) {
            this._anySkipTo(undefined, upperLimit === 31);
            this._nextFn = this._anyNext;
            this._skipToFn = this._anySkipTo;
            return;
        }
        if (typeof config === 'number') {
            this._staticSkipTo();
            this._nextFn = this._staticNext;
            this._skipToFn = this._staticSkipTo;
            return;
        }
        if (Array.isArray(config)) {
            this._listSkipTo();
            this._nextFn = this._listNext;
            this._skipToFn = this._listSkipTo;
            return;
        }
        if ('slope' in config) {
            this.config = generateSequence(config, upperLimit);
            this._listSkipTo();
            this._nextFn = this._listNext;
            this._skipToFn = this._listSkipTo;
            return;
        }
        config.from ?? (config.from = 1);
        config.to ?? (config.to = startFrom);
        if (config.from > config.to) {
            throw new Error(`Config range cannot contain "from" value higher than "to" value.`);
        }
        if (config.to > upperLimit) {
            config.to = upperLimit;
        }
        this._rangeSkipTo(this.startFrom, upperLimit === 31);
        this._nextFn = this._rangeNext;
        this._skipToFn = this._rangeSkipTo;
        return;
    }
    next(reset = false) {
        return this._nextFn(reset);
    }
    skipTo(to = this.startFrom, minusOne = false) {
        this._skipToFn(to, minusOne);
    }
    //! Any
    _anyNext(reset) {
        if (reset || this._currentNum === 0) {
            this._currentNum = this.upperLimit;
            return { value: { value: this._currentNum--, looped: !reset }, done: false };
        }
        return { value: { value: this._currentNum--, looped: false }, done: false };
    }
    _anySkipTo(to = this.startFrom, minusOne) {
        this._currentNum = to - (minusOne ? 1 : 0);
    }
    _staticNext(_) {
        const nextVal = { value: { value: this._currentNum, looped: this._looped }, done: false };
        this._looped = true;
        return nextVal;
    }
    _staticSkipTo() {
        this._currentNum = this.config;
    }
    //! List
    _listNext(reset) {
        const list = this.config;
        if (reset || this._currentNum < 0) {
            this._currentNum = list.length - 1;
            return { value: { value: list[this._currentNum--], looped: !reset }, done: false };
        }
        return { value: { value: list[this._currentNum--], looped: false }, done: false };
    }
    _listSkipTo(to = this.startFrom) {
        this._currentNum = this.config.findIndex(v => v >= to) - 1;
    }
    //! Range
    _rangeNext(reset) {
        const range = this.config;
        if (reset || this._currentNum === 0 || this._currentNum < range.from) {
            this._currentNum = Math.min(range.to, this.upperLimit);
            return { value: { value: this._currentNum--, looped: !reset }, done: false };
        }
        return { value: { value: this._currentNum--, looped: false }, done: false };
    }
    _rangeSkipTo(to = this.startFrom, minusOne) {
        const range = this.config;
        this._currentNum = to - (minusOne ? 1 : 0);
        if (this._currentNum > range.to) {
            this._currentNum = range.to;
        }
    }
}