chrono-node/src/locales/ja/constants.ts

A natural language date parser in Javascript

export const NUMBER = {
    "零": 0,
    "〇": 0,
    "一": 1,
    "二": 2,
    "三": 3,
    "四": 4,
    "五": 5,
    "六": 6,
    "七": 7,
    "八": 8,
    "九": 9,
    "十": 10,
};

export const WEEKDAY_OFFSET = {
    "日": 0,
    "月": 1,
    "火": 2,
    "水": 3,
    "木": 4,
    "金": 5,
    "土": 6,
};

/**
 * to-hankaku.js
 * convert to ascii code strings.
 *
 * @version 1.0.1
 * @author think49
 * @url https://gist.github.com/964592
 * @license http://www.opensource.org/licenses/mit-license.php (The MIT License)
 */
export function toHankaku(text) {
    return String(text)
        .replace(/\u2019/g, "\u0027")
        .replace(/\u201D/g, "\u0022")
        .replace(/\u3000/g, "\u0020")
        .replace(/\uFFE5/g, "\u00A5")
        .replace(
            /[\uFF01\uFF03-\uFF06\uFF08\uFF09\uFF0C-\uFF19\uFF1C-\uFF1F\uFF21-\uFF3B\uFF3D\uFF3F\uFF41-\uFF5B\uFF5D\uFF5E]/g,
            alphaNum
        );
}

function alphaNum(token) {
    return String.fromCharCode(token.charCodeAt(0) - 65248);
}

export function jaStringToNumber(text: string) {
    let number = 0;

    for (let i = 0; i < text.length; i++) {
        const char = text[i];
        if (char === "十") {
            number = number === 0 ? NUMBER[char] : number * NUMBER[char];
        } else {
            number += NUMBER[char];
        }
    }

    return number;
}