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chrono-node

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A natural language date parser in Javascript

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import { ParsingContext } from "../../../chrono"; import { NUMBER_PATTERN, parseNumberPattern, TIME_UNIT_DICTIONARY } from "../constants"; import { ParsingComponents } from "../../../results"; import { AbstractParserWithWordBoundaryChecking } from "../../../common/parsers/AbstractParserWithWordBoundary"; import { reverseTimeUnits } from "../../../utils/timeunits"; import { matchAnyPattern } from "../../../utils/pattern"; export default class DETimeUnitAgoFormatParser extends AbstractParserWithWordBoundaryChecking { constructor() { super(); } innerPattern(): RegExp { 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)})`, "i" ); } innerExtract(context: ParsingContext, match: RegExpMatchArray) { const num = match[2] ? parseNumberPattern(match[2]) : 1; const unit = TIME_UNIT_DICTIONARY[match[4].toLowerCase()]; let timeUnits = {}; timeUnits[unit] = num; // Modifier let modifier = match[1] || match[3] || ""; modifier = modifier.toLowerCase(); if (!modifier) { return; } if (/vor/.test(modifier) || /letzte/.test(modifier) || /vergangen/.test(modifier)) { timeUnits = reverseTimeUnits(timeUnits); } return ParsingComponents.createRelativeFromReference(context.reference, timeUnits); } }