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chrono-node

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A natural language date parser in Javascript

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import { TIME_UNIT_DICTIONARY } from "../constants.js"; import { ParsingComponents } from "../../../results.js"; import dayjs from "dayjs"; import { AbstractParserWithWordBoundaryChecking } from "../../../common/parsers/AbstractParserWithWordBoundary.js"; import { matchAnyPattern } from "../../../utils/pattern.js"; const PATTERN = new RegExp(`(this|last|past|next|after\\s*this)\\s*(${matchAnyPattern(TIME_UNIT_DICTIONARY)})(?=\\s*)` + "(?=\\W|$)", "i"); const MODIFIER_WORD_GROUP = 1; const RELATIVE_WORD_GROUP = 2; export default class ENRelativeDateFormatParser extends AbstractParserWithWordBoundaryChecking { innerPattern() { return PATTERN; } innerExtract(context, match) { const modifier = match[MODIFIER_WORD_GROUP].toLowerCase(); const unitWord = match[RELATIVE_WORD_GROUP].toLowerCase(); const timeunit = TIME_UNIT_DICTIONARY[unitWord]; if (modifier == "next" || modifier.startsWith("after")) { const timeUnits = {}; timeUnits[timeunit] = 1; return ParsingComponents.createRelativeFromReference(context.reference, timeUnits); } if (modifier == "last" || modifier == "past") { const timeUnits = {}; timeUnits[timeunit] = -1; return ParsingComponents.createRelativeFromReference(context.reference, timeUnits); } const components = context.createParsingComponents(); let date = dayjs(context.reference.instant); if (unitWord.match(/week/i)) { date = date.add(-date.get("d"), "d"); components.imply("day", date.date()); components.imply("month", date.month() + 1); components.imply("year", date.year()); } else if (unitWord.match(/month/i)) { date = date.add(-date.date() + 1, "d"); components.imply("day", date.date()); components.assign("year", date.year()); components.assign("month", date.month() + 1); } else if (unitWord.match(/year/i)) { date = date.add(-date.date() + 1, "d"); date = date.add(-date.month(), "month"); components.imply("day", date.date()); components.imply("month", date.month() + 1); components.assign("year", date.year()); } return components; } } //# sourceMappingURL=ENRelativeDateFormatParser.js.map