UNPKG

chrono-node

Version:

A natural language date parser in Javascript

54 lines 2.16 kB
import { findYearClosestToRef } from "../../../calculation/years.js"; import { MONTH_DICTIONARY } from "../constants.js"; import { YEAR_PATTERN, parseYear } from "../constants.js"; import { ORDINAL_NUMBER_PATTERN, parseOrdinalNumberPattern } from "../constants.js"; import { matchAnyPattern } from "../../../utils/pattern.js"; import { AbstractParserWithWordBoundaryChecking } from "../../../common/parsers/AbstractParserWithWordBoundary.js"; const PATTERN = new RegExp(`(?:on\\s{0,3})?` + `(${ORDINAL_NUMBER_PATTERN})` + `(?:` + `\\s{0,3}(?:to|\\-|\\–|until|through|till)?\\s{0,3}` + `(${ORDINAL_NUMBER_PATTERN})` + ")?" + `(?:-|/|\\s{0,3}(?:of)?\\s{0,3})` + `(${matchAnyPattern(MONTH_DICTIONARY)})` + "(?:" + `(?:-|/|,?\\s{0,3})` + `(${YEAR_PATTERN}(?!\\w))` + ")?" + "(?=\\W|$)", "i"); const DATE_GROUP = 1; const DATE_TO_GROUP = 2; const MONTH_NAME_GROUP = 3; const YEAR_GROUP = 4; export default class ENMonthNameLittleEndianParser extends AbstractParserWithWordBoundaryChecking { innerPattern() { return PATTERN; } innerExtract(context, match) { const result = context.createParsingResult(match.index, match[0]); const month = MONTH_DICTIONARY[match[MONTH_NAME_GROUP].toLowerCase()]; const day = parseOrdinalNumberPattern(match[DATE_GROUP]); if (day > 31) { match.index = match.index + match[DATE_GROUP].length; return null; } result.start.assign("month", month); result.start.assign("day", day); if (match[YEAR_GROUP]) { const yearNumber = parseYear(match[YEAR_GROUP]); result.start.assign("year", yearNumber); } else { const year = findYearClosestToRef(context.refDate, day, month); result.start.imply("year", year); } if (match[DATE_TO_GROUP]) { const endDate = parseOrdinalNumberPattern(match[DATE_TO_GROUP]); result.end = result.start.clone(); result.end.assign("day", endDate); } return result; } } //# sourceMappingURL=ENMonthNameLittleEndianParser.js.map