chrono-node
Version:
A natural language date parser in Javascript
65 lines • 2.59 kB
JavaScript
import dayjs from "dayjs";
import { AbstractParserWithWordBoundaryChecking } from "../../../../common/parsers/AbstractParserWithWordBoundary.js";
import { WEEKDAY_OFFSET } from "../constants.js";
const PATTERN = new RegExp("(?<prefix>上|下|这)(?:个)?(?:星期|礼拜|周)(?<weekday>" + Object.keys(WEEKDAY_OFFSET).join("|") + ")");
export default class ZHHansRelationWeekdayParser 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 modifier = null;
const prefix = match.groups.prefix;
if (prefix == "上") {
modifier = "last";
}
else if (prefix == "下") {
modifier = "next";
}
else if (prefix == "这") {
modifier = "this";
}
let startMoment = dayjs(context.refDate);
let startMomentFixed = false;
const refOffset = startMoment.day();
if (modifier == "last" || modifier == "past") {
startMoment = startMoment.day(offset - 7);
startMomentFixed = true;
}
else if (modifier == "next") {
startMoment = startMoment.day(offset + 7);
startMomentFixed = true;
}
else if (modifier == "this") {
startMoment = startMoment.day(offset);
}
else {
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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