chrono-node
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A natural language date parser in Javascript
52 lines • 2.17 kB
JavaScript
import { AbstractParserWithWordBoundaryChecking } from "../../../common/parsers/AbstractParserWithWordBoundary.js";
import { Meridiem } from "../../../types.js";
import { assignSimilarDate, implySimilarTime } from "../../../utils/dates.js";
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 = context.refDate;
switch (dateText) {
case "gisteren":
const previousDay = new Date(targetDate.getTime());
previousDay.setDate(previousDay.getDate() - 1);
assignSimilarDate(component, previousDay);
break;
case "van":
assignSimilarDate(component, targetDate);
break;
case "morgen":
const nextDay = new Date(targetDate.getTime());
nextDay.setDate(nextDay.getDate() + 1);
assignSimilarDate(component, nextDay);
implySimilarTime(component, nextDay);
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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