chrono-node
Version:
A natural language date parser in Javascript
61 lines • 2.48 kB
JavaScript
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);
}
}
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