chrono-node
Version:
A natural language date parser in Javascript
35 lines • 1.33 kB
JavaScript
import { findMostLikelyADYear, findYearClosestToRef } from "../../../calculation/years.js";
import { toHankaku } from "../constants.js";
const PATTERN = new RegExp("([0-9０-９]{4}[\\/|\\／])?" + "([0-1０-１]{0,1}[0-9０-９]{1})(?:[\\/|\\／]([0-3０-３]{0,1}[0-9０-９]{1}))", "i");
const YEAR_GROUP = 1;
const MONTH_GROUP = 2;
const DAY_GROUP = 3;
export default class JPSlashDateFormatParser {
pattern() {
return PATTERN;
}
extract(context, match) {
const result = context.createParsingComponents();
const month = parseInt(toHankaku(match[MONTH_GROUP]));
const day = parseInt(toHankaku(match[DAY_GROUP]));
if (month < 1 || month > 12) {
return null;
}
if (day < 1 || day > 31) {
return null;
}
result.assign("day", day);
result.assign("month", month);
if (match[YEAR_GROUP]) {
const rawYearNumber = parseInt(toHankaku(match[YEAR_GROUP]));
const year = findMostLikelyADYear(rawYearNumber);
result.assign("year", year);
}
else {
const year = findYearClosestToRef(context.reference.instant, day, month);
result.imply("year", year);
}
return result;
}
}
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