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chrono-node

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A natural language date parser in Javascript

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import { ParsingContext, Refiner } from "../../chrono"; import { ParsingResult } from "../../results"; const TIMEZONE_OFFSET_PATTERN = new RegExp("^\\s*(?:\\(?(?:GMT|UTC)\\s?)?([+-])(\\d{1,2})(?::?(\\d{2}))?\\)?", "i"); const TIMEZONE_OFFSET_SIGN_GROUP = 1; const TIMEZONE_OFFSET_HOUR_OFFSET_GROUP = 2; const TIMEZONE_OFFSET_MINUTE_OFFSET_GROUP = 3; export default class ExtractTimezoneOffsetRefiner implements Refiner { refine(context: ParsingContext, results: ParsingResult[]): ParsingResult[] { results.forEach(function (result) { if (result.start.isCertain("timezoneOffset")) { return; } const suffix = context.text.substring(result.index + result.text.length); const match = TIMEZONE_OFFSET_PATTERN.exec(suffix); if (!match) { return; } context.debug(() => { console.log(`Extracting timezone: '${match[0]}' into : ${result}`); }); const hourOffset = parseInt(match[TIMEZONE_OFFSET_HOUR_OFFSET_GROUP]); const minuteOffset = parseInt(match[TIMEZONE_OFFSET_MINUTE_OFFSET_GROUP] || "0"); let timezoneOffset = hourOffset * 60 + minuteOffset; // No timezones have offsets greater than 14 hours, so disregard this match if (timezoneOffset > 14 * 60) { return; } if (match[TIMEZONE_OFFSET_SIGN_GROUP] === "-") { timezoneOffset = -timezoneOffset; } if (result.end != null) { result.end.assign("timezoneOffset", timezoneOffset); } result.start.assign("timezoneOffset", timezoneOffset); result.text += match[0]; }); return results; } }