UNPKG

chrono-node

Version:

A natural language date parser in Javascript

61 lines 2.48 kB
import { WEEKDAY_DICTIONARY } from "../constants.js"; import { matchAnyPattern } from "../../../utils/pattern.js"; import { AbstractParserWithWordBoundaryChecking } from "../../../common/parsers/AbstractParserWithWordBoundary.js"; import { createParsingComponentsAtWeekday } from "../../../common/calculation/weekdays.js"; import { Weekday } from "../../../types.js"; const PATTERN = new RegExp("(?:(?:\\,|\\(|\\()\\s*)?" + "(?:on\\s*?)?" + "(?:(this|last|past|next)\\s*)?" + `(${matchAnyPattern(WEEKDAY_DICTIONARY)}|weekend|weekday)` + "(?:\\s*(?:\\,|\\)|\\)))?" + "(?:\\s*(this|last|past|next)\\s*week)?" + "(?=\\W|$)", "i"); const PREFIX_GROUP = 1; const WEEKDAY_GROUP = 2; const POSTFIX_GROUP = 3; export default class ENWeekdayParser extends AbstractParserWithWordBoundaryChecking { innerPattern() { return PATTERN; } innerExtract(context, match) { const prefix = match[PREFIX_GROUP]; const postfix = match[POSTFIX_GROUP]; let modifierWord = prefix || postfix; modifierWord = modifierWord || ""; modifierWord = modifierWord.toLowerCase(); let modifier = null; if (modifierWord == "last" || modifierWord == "past") { modifier = "last"; } else if (modifierWord == "next") { modifier = "next"; } else if (modifierWord == "this") { modifier = "this"; } const weekday_word = match[WEEKDAY_GROUP].toLowerCase(); let weekday; if (WEEKDAY_DICTIONARY[weekday_word] !== undefined) { weekday = WEEKDAY_DICTIONARY[weekday_word]; } else if (weekday_word == "weekend") { weekday = modifier == "last" ? Weekday.SUNDAY : Weekday.SATURDAY; } else if (weekday_word == "weekday") { const refWeekday = context.reference.getDateWithAdjustedTimezone().getDay(); if (refWeekday == Weekday.SUNDAY || refWeekday == Weekday.SATURDAY) { weekday = modifier == "last" ? Weekday.FRIDAY : Weekday.MONDAY; } else { weekday = refWeekday - 1; weekday = modifier == "last" ? weekday - 1 : weekday + 1; weekday = (weekday % 5) + 1; } } else { return null; } return createParsingComponentsAtWeekday(context.reference, weekday, modifier); } } //# sourceMappingURL=ENWeekdayParser.js.map