chrono-node
Version:
A natural language date parser in Javascript
32 lines • 1.62 kB
JavaScript
import { NUMBER_PATTERN, parseNumberPattern, TIME_UNIT_DICTIONARY } from "../constants.js";
import { ParsingComponents } from "../../../results.js";
import { AbstractParserWithWordBoundaryChecking } from "../../../common/parsers/AbstractParserWithWordBoundary.js";
import { matchAnyPattern } from "../../../utils/pattern.js";
import { reverseDuration } from "../../../calculation/duration.js";
export default class DETimeUnitAgoFormatParser extends AbstractParserWithWordBoundaryChecking {
constructor() {
super();
}
innerPattern() {
return new RegExp(`(?:\\s*((?:nächste|kommende|folgende|letzte|vergangene|vorige|vor(?:her|an)gegangene)(?:s|n|m|r)?|vor|in)\\s*)?` +
`(${NUMBER_PATTERN})?` +
`(?:\\s*(nächste|kommende|folgende|letzte|vergangene|vorige|vor(?:her|an)gegangene)(?:s|n|m|r)?)?` +
`\\s*(${matchAnyPattern(TIME_UNIT_DICTIONARY)})(?=\\W|$)`, "i");
}
innerExtract(context, match) {
const num = match[2] ? parseNumberPattern(match[2]) : 1;
const unit = TIME_UNIT_DICTIONARY[match[4].toLowerCase()];
let timeUnits = {};
timeUnits[unit] = num;
let modifier = match[1] || match[3] || "";
modifier = modifier.toLowerCase();
if (!modifier) {
return;
}
if (/vor/.test(modifier) || /letzte/.test(modifier) || /vergangen/.test(modifier)) {
timeUnits = reverseDuration(timeUnits);
}
return ParsingComponents.createRelativeFromReference(context.reference, timeUnits);
}
}
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