chrono-node
Version:
A natural language date parser in Javascript
41 lines • 1.78 kB
JavaScript
import dayjs from "dayjs";
import { AbstractParserWithWordBoundaryChecking } from "../../../../common/parsers/AbstractParserWithWordBoundary.js";
import { WEEKDAY_OFFSET } from "../constants.js";
const PATTERN = new RegExp("(?:星期|禮拜|週)(?<weekday>" + Object.keys(WEEKDAY_OFFSET).join("|") + ")");
export default class ZHHantWeekdayParser extends AbstractParserWithWordBoundaryChecking {
innerPattern() {
return PATTERN;
}
innerExtract(context, match) {
const result = context.createParsingResult(match.index, match[0]);
const dayOfWeek = match.groups.weekday;
const offset = WEEKDAY_OFFSET[dayOfWeek];
if (offset === undefined)
return null;
let startMoment = dayjs(context.refDate);
const startMomentFixed = false;
const refOffset = startMoment.day();
if (Math.abs(offset - 7 - refOffset) < Math.abs(offset - refOffset)) {
startMoment = startMoment.day(offset - 7);
}
else if (Math.abs(offset + 7 - refOffset) < Math.abs(offset - refOffset)) {
startMoment = startMoment.day(offset + 7);
}
else {
startMoment = startMoment.day(offset);
}
result.start.assign("weekday", offset);
if (startMomentFixed) {
result.start.assign("day", startMoment.date());
result.start.assign("month", startMoment.month() + 1);
result.start.assign("year", startMoment.year());
}
else {
result.start.imply("day", startMoment.date());
result.start.imply("month", startMoment.month() + 1);
result.start.imply("year", startMoment.year());
}
return result;
}
}
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