chrono-node
Version:
A natural language date parser in Javascript
38 lines • 1.63 kB
JavaScript
import { FULL_MONTH_NAME_DICTIONARY, MONTH_DICTIONARY } from "../constants.js";
import { findYearClosestToRef } from "../../../calculation/years.js";
import { matchAnyPattern } from "../../../utils/pattern.js";
import { YEAR_PATTERN, parseYearPattern } from "../constants.js";
import { AbstractParserWithLeftBoundaryChecking } from "./AbstractParserWithWordBoundaryChecking.js";
const MONTH_NAME_GROUP = 2;
const YEAR_GROUP = 3;
export default class UkMonthNameParser extends AbstractParserWithLeftBoundaryChecking {
innerPatternString(context) {
return (`((?:в|у)\\s*)?` +
`(${matchAnyPattern(MONTH_DICTIONARY)})` +
`\\s*` +
`(?:` +
`[,-]?\\s*(${YEAR_PATTERN})?` +
`)?` +
`(?=[^\\s\\w]|\\s+[^0-9]|\\s+$|$)`);
}
innerExtract(context, match) {
const monthName = match[MONTH_NAME_GROUP].toLowerCase();
if (match[0].length <= 3 && !FULL_MONTH_NAME_DICTIONARY[monthName]) {
return null;
}
const result = context.createParsingResult(match.index, match.index + match[0].length);
result.start.imply("day", 1);
const month = MONTH_DICTIONARY[monthName];
result.start.assign("month", month);
if (match[YEAR_GROUP]) {
const year = parseYearPattern(match[YEAR_GROUP]);
result.start.assign("year", year);
}
else {
const year = findYearClosestToRef(context.reference.instant, 1, month);
result.start.imply("year", year);
}
return result;
}
}
//# sourceMappingURL=UKMonthNameParser.js.map