chrono-node
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A natural language date parser in Javascript
48 lines • 1.91 kB
JavaScript
import { AbstractParserWithWordBoundaryChecking } from "../../../common/parsers/AbstractParserWithWordBoundary.js";
import { Meridiem } from "../../../types.js";
import { assignSimilarDate, assignTheNextDay } from "../../../utils/dayjs.js";
import dayjs from "dayjs";
const DATE_GROUP = 1;
const TIME_OF_DAY_GROUP = 2;
export default class NLCasualDateTimeParser extends AbstractParserWithWordBoundaryChecking {
innerPattern(context) {
return /(gisteren|morgen|van)(ochtend|middag|namiddag|avond|nacht)(?=\W|$)/i;
}
innerExtract(context, match) {
const dateText = match[DATE_GROUP].toLowerCase();
const timeText = match[TIME_OF_DAY_GROUP].toLowerCase();
const component = context.createParsingComponents();
const targetDate = dayjs(context.refDate);
switch (dateText) {
case "gisteren":
assignSimilarDate(component, targetDate.add(-1, "day"));
break;
case "van":
assignSimilarDate(component, targetDate);
break;
case "morgen":
assignTheNextDay(component, targetDate);
break;
}
switch (timeText) {
case "ochtend":
component.imply("meridiem", Meridiem.AM);
component.imply("hour", 6);
break;
case "middag":
component.imply("meridiem", Meridiem.AM);
component.imply("hour", 12);
break;
case "namiddag":
component.imply("meridiem", Meridiem.PM);
component.imply("hour", 15);
break;
case "avond":
component.imply("meridiem", Meridiem.PM);
component.imply("hour", 20);
break;
}
return component;
}
}
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