chrono-node
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A natural language date parser in Javascript
50 lines • 2.11 kB
JavaScript
import { AbstractParserWithWordBoundaryChecking } from "../../../common/parsers/AbstractParserWithWordBoundary.js";
import { assignSimilarDate } from "../../../utils/dates.js";
import * as references from "../../../common/casualReferences.js";
const PATTERN = /(now|today|tonight|tomorrow|overmorrow|tmr|tmrw|yesterday|last\s*night)(?=\W|$)/i;
export default class ENCasualDateParser extends AbstractParserWithWordBoundaryChecking {
innerPattern(context) {
return PATTERN;
}
innerExtract(context, match) {
let targetDate = context.refDate;
const lowerText = match[0].toLowerCase();
let component = context.createParsingComponents();
switch (lowerText) {
case "now":
component = references.now(context.reference);
break;
case "today":
component = references.today(context.reference);
break;
case "yesterday":
component = references.yesterday(context.reference);
break;
case "tomorrow":
case "tmr":
case "tmrw":
component = references.tomorrow(context.reference);
break;
case "tonight":
component = references.tonight(context.reference);
break;
case "overmorrow":
component = references.theDayAfter(context.reference, 2);
break;
default:
if (lowerText.match(/last\s*night/)) {
if (targetDate.getHours() > 6) {
const previousDay = new Date(targetDate.getTime());
previousDay.setDate(previousDay.getDate() - 1);
targetDate = previousDay;
}
assignSimilarDate(component, targetDate);
component.imply("hour", 0);
}
break;
}
component.addTag("parser/ENCasualDateParser");
return component;
}
}
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