chrono-node
Version:
A natural language date parser in Javascript
51 lines • 2.2 kB
JavaScript
import { findYearClosestToRef } from "../../../calculation/years.js";
import { MONTH_DICTIONARY } from "../constants.js";
import { YEAR_PATTERN, parseYearPattern } from "../constants.js";
import { ORDINAL_NUMBER_PATTERN, parseOrdinalNumberPattern } from "../constants.js";
import { matchAnyPattern } from "../../../utils/pattern.js";
import { AbstractParserWithLeftRightBoundaryChecking } from "./AbstractParserWithWordBoundaryChecking.js";
const DATE_GROUP = 1;
const DATE_TO_GROUP = 2;
const MONTH_NAME_GROUP = 3;
const YEAR_GROUP = 4;
export default class UKMonthNameLittleEndianParser extends AbstractParserWithLeftRightBoundaryChecking {
innerPatternString(context) {
return (`(?:з|із)?\\s*(${ORDINAL_NUMBER_PATTERN})` +
`(?:` +
`\\s{0,3}(?:по|-|–|до)?\\s{0,3}` +
`(${ORDINAL_NUMBER_PATTERN})` +
`)?` +
`(?:-|\\/|\\s{0,3}(?:of)?\\s{0,3})` +
`(${matchAnyPattern(MONTH_DICTIONARY)})` +
`(?:` +
`(?:-|\\/|,?\\s{0,3})` +
`(${YEAR_PATTERN}(?![^\\s]\\d))` +
`)?`);
}
innerExtract(context, match) {
const result = context.createParsingResult(match.index, match[0]);
const month = MONTH_DICTIONARY[match[MONTH_NAME_GROUP].toLowerCase()];
const day = parseOrdinalNumberPattern(match[DATE_GROUP]);
if (day > 31) {
match.index = match.index + match[DATE_GROUP].length;
return null;
}
result.start.assign("month", month);
result.start.assign("day", day);
if (match[YEAR_GROUP]) {
const yearNumber = parseYearPattern(match[YEAR_GROUP]);
result.start.assign("year", yearNumber);
}
else {
const year = findYearClosestToRef(context.reference.instant, day, month);
result.start.imply("year", year);
}
if (match[DATE_TO_GROUP]) {
const endDate = parseOrdinalNumberPattern(match[DATE_TO_GROUP]);
result.end = result.start.clone();
result.end.assign("day", endDate);
}
return result;
}
}
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