chrono-node
Version:
A natural language date parser in Javascript
40 lines • 1.65 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";
const PATTERN = new RegExp("(?:(?:\\,|\\(|\\（)\\s*)?" +
"(?:a[mn]\\s*?)?" +
"(?:(diese[mn]|letzte[mn]|n(?:ä|ae)chste[mn])\\s*)?" +
`(${matchAnyPattern(WEEKDAY_DICTIONARY)})` +
"(?:\\s*(?:\\,|\\)|\\）))?" +
"(?:\\s*(diese|letzte|n(?:ä|ae)chste)\\s*woche)?" +
"(?=\\W|$)", "i");
const PREFIX_GROUP = 1;
const SUFFIX_GROUP = 3;
const WEEKDAY_GROUP = 2;
export default class DEWeekdayParser extends AbstractParserWithWordBoundaryChecking {
innerPattern() {
return PATTERN;
}
innerExtract(context, match) {
const dayOfWeek = match[WEEKDAY_GROUP].toLowerCase();
const offset = WEEKDAY_DICTIONARY[dayOfWeek];
const prefix = match[PREFIX_GROUP];
const postfix = match[SUFFIX_GROUP];
let modifierWord = prefix || postfix;
modifierWord = modifierWord || "";
modifierWord = modifierWord.toLowerCase();
let modifier = null;
if (modifierWord.match(/letzte/)) {
modifier = "last";
}
else if (modifierWord.match(/chste/)) {
modifier = "next";
}
else if (modifierWord.match(/diese/)) {
modifier = "this";
}
return createParsingComponentsAtWeekday(context.reference, offset, modifier);
}
}
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