chrono-node
Version:
A natural language date parser in Javascript
41 lines • 1.72 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, parseYear } from "../constants.js";
import { AbstractParserWithWordBoundaryChecking } from "../../../common/parsers/AbstractParserWithWordBoundary.js";
const PATTERN = new RegExp(`((?:in)\\s*)?` +
`(${matchAnyPattern(MONTH_DICTIONARY)})` +
`\\s*` +
`(?:` +
`(?:,|-|of)?\\s*(${YEAR_PATTERN})?` +
")?" +
"(?=[^\\s\\w]|\\s+[^0-9]|\\s+$|$)", "i");
const PREFIX_GROUP = 1;
const MONTH_NAME_GROUP = 2;
const YEAR_GROUP = 3;
export default class ENMonthNameParser extends AbstractParserWithWordBoundaryChecking {
innerPattern() {
return PATTERN;
}
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[PREFIX_GROUP] || "").length, match.index + match[0].length);
result.start.imply("day", 1);
result.start.addTag("parser/ENMonthNameParser");
const month = MONTH_DICTIONARY[monthName];
result.start.assign("month", month);
if (match[YEAR_GROUP]) {
const year = parseYear(match[YEAR_GROUP]);
result.start.assign("year", year);
}
else {
const year = findYearClosestToRef(context.refDate, 1, month);
result.start.imply("year", year);
}
return result;
}
}
//# sourceMappingURL=ENMonthNameParser.js.map