chrono-node
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A natural language date parser in Javascript
99 lines • 4.07 kB
JavaScript
import { AbstractParserWithWordBoundaryChecking } from "../../../common/parsers/AbstractParserWithWordBoundary.js";
import { assignSimilarDate, implySimilarTime } from "../../../utils/dates.js";
import * as references from "../../../common/casualReferences.js";
const PATTERN = new RegExp(`(nu|idag|imorgon|övermorgon|igår|förrgår|i\\s*förrgår)` +
`(?:\\s*(?:på\\s*)?(morgonen?|förmiddagen?|middagen?|eftermiddagen?|kvällen?|natten?|midnatt))?` +
`(?=\\W|$)`, "i");
const DATE_GROUP = 1;
const TIME_GROUP = 2;
export default class SVCasualDateParser extends AbstractParserWithWordBoundaryChecking {
innerPattern(context) {
return PATTERN;
}
innerExtract(context, match) {
const targetDate = context.refDate;
const dateKeyword = (match[DATE_GROUP] || "").toLowerCase();
const timeKeyword = (match[TIME_GROUP] || "").toLowerCase();
let component = context.createParsingComponents();
switch (dateKeyword) {
case "nu":
component = references.now(context.reference);
break;
case "idag":
component = references.today(context.reference);
break;
case "imorgon":
case "imorn":
const nextDay = new Date(targetDate.getTime());
nextDay.setDate(nextDay.getDate() + 1);
assignSimilarDate(component, nextDay);
implySimilarTime(component, nextDay);
break;
case "igår":
const previousDay = new Date(targetDate.getTime());
previousDay.setDate(previousDay.getDate() - 1);
assignSimilarDate(component, previousDay);
implySimilarTime(component, previousDay);
break;
case "förrgår":
case "i förrgår":
const twoDaysAgo = new Date(targetDate.getTime());
twoDaysAgo.setDate(twoDaysAgo.getDate() - 2);
assignSimilarDate(component, twoDaysAgo);
implySimilarTime(component, twoDaysAgo);
break;
}
switch (timeKeyword) {
case "morgon":
case "morgonen":
component.imply("hour", 6);
component.imply("minute", 0);
component.imply("second", 0);
component.imply("millisecond", 0);
break;
case "förmiddag":
case "förmiddagen":
component.imply("hour", 9);
component.imply("minute", 0);
component.imply("second", 0);
component.imply("millisecond", 0);
break;
case "middag":
case "middagen":
component.imply("hour", 12);
component.imply("minute", 0);
component.imply("second", 0);
component.imply("millisecond", 0);
break;
case "eftermiddag":
case "eftermiddagen":
component.imply("hour", 15);
component.imply("minute", 0);
component.imply("second", 0);
component.imply("millisecond", 0);
break;
case "kväll":
case "kvällen":
component.imply("hour", 20);
component.imply("minute", 0);
component.imply("second", 0);
component.imply("millisecond", 0);
break;
case "natt":
case "natten":
case "midnatt":
if (timeKeyword === "midnatt") {
component.imply("hour", 0);
}
else {
component.imply("hour", 2);
}
component.imply("minute", 0);
component.imply("second", 0);
component.imply("millisecond", 0);
break;
}
return component;
}
}
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